JP7837235B2 - Electric vehicle charger design support system, electric vehicle charger design support method and program - Google Patents

Description

This invention relates to an electric vehicle charger design support system, an electric vehicle charger design support method, and a program.

Patent Document 1 describes a power simulation system for determining whether it is necessary to change the current contract capacity when installing an electric vehicle charging device in a typical residence. In the technology described in Patent Document 1, in order to determine whether it is necessary to change the current contract capacity when installing an electric vehicle charging device, first, the current value flowing through the circuit is measured for a certain period of time to understand the power usage situation. Next, the time period for charging the electric vehicle and the current value during charging are set. Next, the charging current value during the time period for charging the electric vehicle is added to the measured current value. Finally, based on the maximum value of the total current value obtained by adding the charging current value during the time period for charging the electric vehicle and the measured current value, it is determined whether it is necessary to change the current contract capacity.
While the technology described in Patent Document 1 can determine whether it is necessary to change the current contract capacity when installing an electric vehicle charging device in a general residence, it cannot calculate the cubicle power receiving capacity after the new electric vehicle charging device is installed, the initial costs required to install the new electric vehicle charging device, or the running costs corresponding to the increase in electricity charges after the new electric vehicle charging device is installed compared to the electricity charges before the new electric vehicle charging device is installed.

Incidentally, designers of electric vehicle (EV) charging systems need to provide customers considering the installation of new EV charging systems with information such as the cubicle power receiving capacity after the new system is installed, the initial costs required for installation, and the running costs equivalent to the increase in electricity rates after the new system is installed compared to the rates before installation. Therefore, a technology is desired that allows users to obtain information on the cubicle power receiving capacity after the new system is installed, the initial costs required for installation, and the running costs equivalent to the increase in electricity rates after the new system is installed, simply by inputting minimal information.

Japanese Patent Publication No. 2013-020498

In view of the above, the present invention aims to provide an electric vehicle charger design support system, electric vehicle charger design support method, and program that, by inputting only minimal information, can obtain information on the cubicle power receiving capacity after the addition of an electric vehicle charger, the initial costs required to start using the electric vehicle charger, and the running costs corresponding to the increase in electricity charges after the addition of the electric vehicle charger compared to the electricity charges before the addition of the electric vehicle charger.

One aspect of the present invention is an electric vehicle charger design support system for assisting the design of electric vehicle chargers, comprising: an acquisition unit for acquiring information used in the design of the electric vehicle charger; and a calculation unit for calculating calculation items from the information acquired by the acquisition unit, wherein the information acquired by the acquisition unit includes at least the number of electric vehicle chargers, the assumed charging time at the electric vehicle charger, the required charge amount per electric vehicle, information relating to the electric vehicle charger, the cubicle power receiving capacity before the electric vehicle charger is added, electric vehicle charging information, and the electricity rate per unit, and the calculation unit calculates the cubicle power receiving capacity after the electric vehicle charger is added as the calculation item based on the cubicle power receiving capacity before the electric vehicle charger is added and the information relating to the electric vehicle charger, and the cubicle power receiving capacity after the electric vehicle charger is added This is an electric vehicle charger design support system comprising: a cubicle power receiving capacity calculation unit for calculating power receiving capacity; an initial cost calculation unit that calculates the initial costs required to start using the electric vehicle charger based on at least the number of electric vehicle chargers, information related to the electric vehicle chargers, and information related to the cubicle; and a running cost calculation unit that calculates the running costs equivalent to the increase in electricity charges after the addition of the electric vehicle charger compared to the electricity charges before the addition of the electric vehicle charger, based on at least the number of electric vehicle chargers, the estimated charging time at the electric vehicle charger, the required charge amount per electric vehicle, the increase in cubicle power receiving capacity due to the addition of the electric vehicle charger, electric vehicle charging information, and the electricity rate.

One aspect of the present invention is an electric vehicle charger design support method for supporting the design of electric vehicle chargers, comprising: an acquisition step for acquiring information used in the design of the electric vehicle charger; and a calculation step for calculating calculation items from the information acquired in the acquisition step, wherein the information acquired in the acquisition step includes at least the number of electric vehicle chargers, the assumed charging time at the electric vehicle charger, the required charge amount per electric vehicle, information relating to the electric vehicle charger, the cubicle power receiving capacity before the electric vehicle charger is added, electric vehicle charging information, and the electricity rate per unit, and the calculation step includes, based on the cubicle power receiving capacity before the electric vehicle charger is added and the information relating to the electric vehicle charger, the calculation items include, the cubicle power receiving capacity after the electric vehicle charger is added. This is an electric vehicle charger design support method that includes: a cubicle power receiving capacity calculation step for calculating the cubicle power receiving capacity; an initial cost calculation step for calculating the initial costs required to start using the electric vehicle charger, based on at least the number of electric vehicle chargers, information related to the electric vehicle chargers, and information related to the cubicle; and a running cost calculation step for calculating the running costs, based on at least the number of electric vehicle chargers, the estimated charging time at the electric vehicle chargers, the required charge amount per electric vehicle, the increase in cubicle power receiving capacity due to the addition of the electric vehicle chargers, electric vehicle charging information, and the electricity rate, based on at least the number of electric vehicle chargers, the estimated charging time at the electric vehicle chargers, the required charge amount per electric vehicle, the increase in cubicle power receiving capacity due to the addition of the electric vehicle chargers, the electric vehicle charging information, and the electricity rate, as the calculation items.

One aspect of the present invention is a program for causing a computer to perform an acquisition step of acquiring information used in the design of an electric vehicle charger, and a calculation step of calculating calculation items from the information acquired in the acquisition step, wherein the information acquired in the acquisition step includes at least the number of electric vehicle chargers, the assumed charging time at the electric vehicle charger, the required charge amount per electric vehicle, information regarding the electric vehicle charger, the cubicle power receiving capacity before the electric vehicle charger is added, electric vehicle charging information, and the electricity rate per unit, and the calculation step includes, based on the cubicle power receiving capacity before the electric vehicle charger is added and the information regarding the electric vehicle charger, the calculation items include, the cubicle power receiving capacity after the electric vehicle charger is added The program includes a cubicle power receiving capacity calculation step for calculating the power receiving capacity; an initial cost calculation step for calculating the initial costs required to start using the electric vehicle chargers, based on at least the number of electric vehicle chargers, information regarding the electric vehicle chargers, and information regarding the cubicle; and a running cost calculation step for calculating the running costs, based on at least the number of electric vehicle chargers, the estimated charging time at the electric vehicle chargers, the required charge amount per electric vehicle, the increase in cubicle power receiving capacity due to the addition of the electric vehicle chargers, electric vehicle charging information, and the electricity rate, based on at least the number of electric vehicle chargers, the estimated charging time at the electric vehicle chargers, the required charge amount per electric vehicle, the increase in cubicle power receiving capacity due to the addition of the electric vehicle chargers, the electric vehicle charging information, and the electricity rate, as the calculation item.

According to the present invention, it is possible to provide an electric vehicle charger design support system, electric vehicle charger design support method, and program that can obtain information on the cubicle power receiving capacity after the addition of an electric vehicle charger, the initial costs required to start using the electric vehicle charger, and the running costs corresponding to the increase in electricity charges after the addition of the electric vehicle charger compared to the electricity charges before the addition of the electric vehicle charger, simply by inputting minimal information.

This figure shows an example of the electric vehicle charger design support system 1 according to the first embodiment. This is a flowchart illustrating an example of the process performed in the electric vehicle charger design support system 1 of the first embodiment. This diagram illustrates an example of calculation performed by the initial cost calculation unit 12B. This diagram shows an example of a "contracted power calculation formula". This figure shows an example of "power receiving equipment information". This diagram illustrates an example of calculation performed by the running cost calculation unit 12C. This flowchart illustrates an example of the process performed in the electric vehicle charger design support system 1 to determine whether the additional electric vehicle charger should be a fast charger or a standard charger. This flowchart illustrates an example of the process performed in the electric vehicle charger design support system 1 to determine whether the additional electric vehicle charger should be a fast charger or a standard charger. This flowchart illustrates an example of the process performed in the electric vehicle charger design support system 1 to determine whether the additional electric vehicle charger should be a fast charger or a standard charger. This flowchart illustrates an example of the process performed in the electric vehicle charger design support system 1 to determine whether the additional electric vehicle charger should be a fast charger or a standard charger. This diagram illustrates an example of calculations performed by the initial cost calculation unit 12B, comparing the case where an uncontrolled standard charger is used with the case where a controlled standard charger is used and a storage battery is introduced. This diagram illustrates an example of calculations performed by the running cost calculation unit 12C, comparing the case where an uncontrolled standard charger is used with the case where a controlled standard charger is used and a storage battery is introduced. This figure shows an example of the information that the calculation unit 12 uses to calculate the cost of an electric vehicle charger (standard charger). This figure shows an example of the information that the calculation unit 12 uses to calculate the cost of an electric vehicle charger (fast charger). This figure shows an example of information used by the calculation unit 12 to calculate the cost of equipment (solar power generation equipment, battery storage equipment) that can be used in combination with electric vehicle chargers and cubicles. This figure shows an example of the information used by the calculation unit 12 to calculate the construction costs (labor costs, material costs) for the installation of electric vehicle chargers and other related work. This figure shows an example of the information that the calculation unit 12 uses to calculate construction costs (labor costs, material costs) when the building to which an electric vehicle charger is to be added is a family-oriented apartment building. This diagram shows an example of how the initial cost calculation unit 12B calculates the initial cost B1 required to start using an electric vehicle charger as the sum of "equipment costs" and "construction costs". This diagram illustrates an example of calculations performed by the cubicle power receiving capacity calculation unit 12A and the initial cost calculation unit 12B. This figure shows an example of the information (electricity rate unit price C6) used by the calculation unit 12 to calculate the running cost C1. This figure shows other examples of information used by the calculation unit 12 to calculate the running cost C1 (electric vehicle charging information by building use (for example, charging usage time (estimated charging time C2))). This figure shows other examples of information used by the calculation unit 12 to calculate the running cost C1 (electric vehicle charging information by building use (for example, charging usage time (estimated charging time C2))). These figures are graphs of the numerical values shown in Figures 21 and 22. This figure shows yet another example of the information used by the calculation unit 12 to calculate the running cost C1 (electric vehicle charging information by building use (for example, charging usage time (estimated charging time C2))). This figure shows yet another example of the information used by the calculation unit 12 to calculate the running cost C1 (electric vehicle charging information by building use (for example, charging usage time (estimated charging time C2))). Figures 24 and 25 are graphs showing the numerical values. This diagram illustrates an example of calculations performed by the running cost calculation unit 12C. Figure 12 is a diagram illustrating an example of the simulation termination determination (STEP 4.5) performed in the electric vehicle charger design support system 1 during step SK. This diagram illustrates the situation where it is necessary to increase the power receiving capacity of the cubicle and rerun the simulation. This figure shows examples of system configuration diagrams generated by the system configuration diagram generation unit 15. This figure shows examples of system configuration diagrams generated by the system configuration diagram generation unit 15. This figure shows examples of system configuration diagrams generated by the system configuration diagram generation unit 15.

<First Embodiment>
The following describes a first embodiment of the electric vehicle charger design support system, electric vehicle charger design support method, and program of the present invention.

Figure 1 shows an example of the electric vehicle charger design support system 1 according to the first embodiment. Figure 2 is a flowchart illustrating an example of the process performed in the electric vehicle charger design support system 1 according to the first embodiment.
In the example shown in Figure 1, the electric vehicle charger design support system 1 of the first embodiment assists in the design of an electric vehicle charger.
In the example shown in Figure 2, in step SA, the electric vehicle charger design support system 1 receives input from a user of the electric vehicle charger design support system 1 (for example, a designer of electric vehicle chargers) indicating whether or not an electric vehicle charger is necessary (input item).

In the example shown in Figure 1, the electric vehicle charger design support system 1 includes an acquisition unit 11, a calculation unit 12, a determination unit 13, a processing unit 14, and a system configuration diagram generation unit 15.
The acquisition unit 11 acquires information used in the design of electric vehicle chargers ("input items" and "storage items" described later). The information acquired by the acquisition unit 11 includes, for example, the number of additional electric vehicle chargers B2, the assumed charging time at the electric vehicle charger C2, the required charge amount per electric vehicle C3, information about the electric vehicle charger (for example, the rated voltage A3 of the electric vehicle charger, the rated current A4 of the electric vehicle charger, the unit price B3 of the additional electric vehicle charger, etc.), the cubicle power receiving capacity A2 before the addition of the electric vehicle charger, electric vehicle charging information C5, and the electricity rate unit price C6.

The calculation unit 12 calculates calculation items from the information (input items and stored items) acquired by the acquisition unit 11. The calculation unit 12 includes a cubicle power receiving capacity calculation unit 12A, an initial cost calculation unit 12B, a running cost calculation unit 12C, and a charging output calculation unit 12D.
The determination unit 13 performs the determination process shown in the flowcharts in Figures 7 to 10, for example. The processing unit 14 performs the saving process shown in the flowcharts in Figures 7 to 10, for example. The system configuration diagram generation unit 15 generates a system configuration diagram (a system configuration diagram including a cubicle, an electric vehicle charger, etc.) as shown in Figures 30 to 32, for example.

In the example shown in Figure 2, in step SB, the electric vehicle charger design support system 1 accepts inputs from the user of the electric vehicle charger design support system 1, including the number of electric vehicle chargers to be added B2, the estimated charging time at the added electric vehicle chargers C2, and the required charge amount per electric vehicle C3 (input items). In other words, the acquisition unit 11 of the electric vehicle charger design support system 1 acquires information used in the design of electric vehicle chargers: the number of electric vehicle chargers to be added B2, the estimated charging time at the added electric vehicle chargers C2, and the required charge amount per electric vehicle C3.
In step SC, the electric vehicle charger design support system 1 accepts input from the user of the electric vehicle charger design support system 1, including the cubicle power receiving capacity A2 before the electric vehicle charger is added and the use of the building where the electric vehicle charger will be installed (input items). In other words, the acquisition unit 11 of the electric vehicle charger design support system 1 acquires information used in the design of the electric vehicle charger, namely the cubicle power receiving capacity A2 before the electric vehicle charger is added and the use of the building where the electric vehicle charger will be installed.
In another example, in step SC, the acquisition unit 11 may acquire the cubicle power receiving capacity A2 before the addition of electric vehicle chargers, which are stored inside or outside the electric vehicle charger design support system 1, and the use of the building where the electric vehicle chargers will be installed (stored items).

Figures 7 to 10 are flowcharts illustrating an example of "STEP 0," a process performed in the electric vehicle charger design support system 1 to determine whether the additional electric vehicle charger should be a fast charger or a standard charger.
In the examples shown in Figures 7 to 10, when the process "STEP 0" is started, in step S1, the electric vehicle charger design support system 1 asks the user of the electric vehicle charger design support system 1 (for example, a designer of electric vehicle chargers) whether or not an electric vehicle charger is needed. If the user of the electric vehicle charger design support system 1 inputs that an electric vehicle charger is needed, the process proceeds to step S2. If the user of the electric vehicle charger design support system 1 inputs that an electric vehicle charger is not needed, the process "STEP 0" ends.

In step S2, the determination unit 13 determines whether the user of the electric vehicle charger design support system 1 has entered the purpose of the building where the electric vehicle charger will be installed. If the user of the electric vehicle charger design support system 1 has entered the purpose of the building where the electric vehicle charger will be installed, the system proceeds to step S3. If the user of the electric vehicle charger design support system 1 has not entered the purpose of the building where the electric vehicle charger will be installed, the electric vehicle charger design support system 1 requests the user of the electric vehicle charger design support system 1 to enter the purpose of the building where the electric vehicle charger will be installed, and the system returns to step S2.
In step S3, the processing unit 14 stores the intended use of the building where the electric vehicle charger will be installed, as entered by the user of the electric vehicle charger design support system 1.

Next, in step S4, the determination unit 13 determines whether or not the building to which the electric vehicle charger will be installed has a contract with a specific power company. If the building to which the electric vehicle charger will be installed has a contract with a specific power company, the process proceeds to step S5; otherwise, the process proceeds to step S7.
Specifically, in step S4, for example, the determination unit 13 determines whether the user of the electric vehicle charger design support system 1 has entered the power company to which the building where the electric vehicle charger will be installed is contracted. If the user of the electric vehicle charger design support system 1 has entered the power company to which the building where the electric vehicle charger will be installed is contracted is entered, the system proceeds to step S5. If the user of the electric vehicle charger design support system 1 has not entered the power company to which the building where the electric vehicle charger will be installed is contracted is not entered, the system proceeds to step S7.

In step S5, the electric vehicle charger design support system 1 accepts input of the electricity rate unit price C6 from the user of the electric vehicle charger design support system 1.
Next, in step S6, the processing unit 14 saves the electricity rate unit price C6 that was entered in step S5. Then, the process proceeds to step S9.

In step S7, the determination unit 13 determines whether the user of the electric vehicle charger design support system 1 has entered the address of the building where the electric vehicle charger will be installed (i.e., information indicating which power company's jurisdiction the building where the electric vehicle charger will be installed belongs to). If the user of the electric vehicle charger design support system 1 has entered the address of the building where the electric vehicle charger will be installed, the system proceeds to step S8. If the user of the electric vehicle charger design support system 1 has not entered the address of the building where the electric vehicle charger will be installed, the electric vehicle charger design support system 1 requests the user of the electric vehicle charger design support system 1 to enter the address of the building where the electric vehicle charger will be installed, and returns to step S7.
In step S8, the processing unit 14 saves the electricity rate unit price C6 and proceeds to step S9.

In step S9, the determination unit 13 determines whether the user of the electric vehicle charger design support system 1 has entered the cubicle power receiving capacity A2 before the electric vehicle charger was added. If the user of the electric vehicle charger design support system 1 has entered the cubicle power receiving capacity A2 before the electric vehicle charger was added, the system proceeds to step S10. If the user of the electric vehicle charger design support system 1 has not entered the cubicle power receiving capacity A2 before the electric vehicle charger was added, the electric vehicle charger design support system 1 requests the user of the electric vehicle charger design support system 1 to enter the cubicle power receiving capacity A2 before the electric vehicle charger was added, and the system returns to step S9.
In step S10, the processing unit 14 saves the cubicle power receiving capacity A2 before the electric vehicle charger is added, and proceeds to step S11.

In step S11, the determination unit 13 determines whether the user of the electric vehicle charger design support system 1 has entered the amount of electricity used by time of day before the electric vehicle charger was added. If the user of the electric vehicle charger design support system 1 has entered the amount of electricity used by time of day before the electric vehicle charger was added, the system proceeds to step S12. If the user of the electric vehicle charger design support system 1 has not entered the amount of electricity used by time of day before the electric vehicle charger was added, the electric vehicle charger design support system 1 requests the user of the electric vehicle charger design support system 1 to enter the amount of electricity used by time of day before the electric vehicle charger was added, and returns to step S11.
In step S12, the processing unit 14 saves the amount of electricity used by time period before the electric vehicle charger was added, and then proceeds to step S13.

In step S13, the determination unit 13 determines whether or not a fast charger should be selected as the additional electric vehicle charger. If a fast charger should be selected as the additional electric vehicle charger, the process proceeds to step S24. On the other hand, if a fast charger should not be selected as the additional electric vehicle charger (for example, if information indicating that the selection of a fast charger is NG has been input into the electric vehicle charger design support system 1 by a user of the electric vehicle charger design support system 1), the process proceeds to step S14.

In step S14, the determination unit 13 determines whether the required number of standard chargers has been entered by the user of the electric vehicle charger design support system 1. If the required number of standard chargers has been entered by the user of the electric vehicle charger design support system 1, the process proceeds to step S15. If the required number of standard chargers has not been entered by the user of the electric vehicle charger design support system 1, the electric vehicle charger design support system 1 requests the user of the electric vehicle charger design support system 1 to enter the required number of standard chargers, and the process returns to step S14.
In step S15, the processing unit 14 saves the required number of standard chargers and proceeds to step S16.

In step S16, the determination unit 13 determines whether the user of the electric vehicle charger design support system 1 has entered the assumed charging time C2 and the required charge amount C3 per electric vehicle for the standard charger. If the user of the electric vehicle charger design support system 1 has entered the assumed charging time C2 and the required charge amount C3 per electric vehicle for the standard charger, the system proceeds to step S17. If the user of the electric vehicle charger design support system 1 has not entered the assumed charging time C2 and the required charge amount C3 per electric vehicle for the standard charger, the electric vehicle charger design support system 1 requests the user of the electric vehicle charger design support system 1 to enter the assumed charging time C2 and the required charge amount C3 per electric vehicle for the standard charger, and the system returns to step S16.
In step S17, the processing unit 14 saves the expected charging time C2 and the required charge amount C3 per electric vehicle for the additional standard charger, and then proceeds to step S18.
In step S18, the charging output calculation unit 12D calculates the charging output (= C3/C2), which is the value obtained by dividing the required charge amount C3 per electric vehicle by the assumed charging time C2 at the additional standard charger.

Next, in step S19, the determination unit 13 determines whether the charging output calculated in step S18 is 6 kW or less. If the charging output is 6 kW or less, the process proceeds to step S20. On the other hand, if the charging output is greater than 6 kW, the process proceeds to step S21.
In step S20, the processing unit 14 selects a standard charger as the additional electric vehicle charger and saves that information.
In step S21, the determination unit 13 determines whether or not it is acceptable to select a fast charger as the additional electric vehicle charger. If it is acceptable to select a fast charger as the additional electric vehicle charger, the process proceeds to step S22. On the other hand, if it is not acceptable to select a fast charger as the additional electric vehicle charger (for example, if information indicating that the selection of a fast charger is not acceptable has been input into the electric vehicle charger design support system 1 by a user of the electric vehicle charger design support system 1), the process proceeds to step S23.
In step S22, the processing unit 14 selects a fast charger as the additional electric vehicle charger and saves that information.
In step S23, the electric vehicle charger design support system 1 requests the user of the electric vehicle charger design support system 1 to re-input the assumed charging time C2 and the required charge amount C3 per electric vehicle for the additional standard charger, and then returns to step S16.

In step S24, the processing unit 14 selects a rapid charger as the additional electric vehicle charger and saves this information.

Next, in step S25, the determination unit 13 determines whether the required number of rapid chargers has been entered by the user of the electric vehicle charger design support system 1. If the required number of rapid chargers has been entered by the user of the electric vehicle charger design support system 1, the process proceeds to step S26. If the required number of rapid chargers has not been entered by the user of the electric vehicle charger design support system 1, the electric vehicle charger design support system 1 requests the user of the electric vehicle charger design support system 1 to enter the required number of rapid chargers, and the process returns to step S25.
In step S26, the processing unit 14 saves the required number of rapid chargers and proceeds to step S27.

In step S27, the determination unit 13 determines whether the user of the electric vehicle charger design support system 1 has entered the assumed charging time C2 and the required charge amount C3 per electric vehicle for the fast charger to be added. If the user of the electric vehicle charger design support system 1 has entered the assumed charging time C2 and the required charge amount C3 per electric vehicle for the fast charger to be added, the system proceeds to step S28. If the user of the electric vehicle charger design support system 1 has not entered the assumed charging time C2 and the required charge amount C3 per electric vehicle for the fast charger to be added, the electric vehicle charger design support system 1 requests the user of the electric vehicle charger design support system 1 to enter the assumed charging time C2 and the required charge amount C3 per electric vehicle for the fast charger to be added, and the system returns to step S27.
In step S28, the processing unit 14 saves the expected charging time C2 and the required charge amount C3 per electric vehicle at the additional rapid charger, and then proceeds to step S29.
In step S29, the charging output calculation unit 12D calculates the charging output (= C3/C2), which is the value obtained by dividing the required charge amount C3 per electric vehicle by the assumed charging time C2 at the additional fast charger.

In the example shown in Figure 1, the cubicle power receiving capacity calculation unit 12A calculates the cubicle power receiving capacity A1 after the addition of electric vehicle chargers, based on the cubicle power receiving capacity A2 before the addition of electric vehicle chargers and information regarding electric vehicle chargers. The information regarding electric vehicle chargers includes the rated voltage A3 of the electric vehicle charger, the rated current A4 of the electric vehicle charger, and the number of electric vehicle chargers to be added B2. The cubicle power receiving capacity A1 after the addition of electric vehicle chargers, calculated by the cubicle power receiving capacity calculation unit 12A, is expressed, for example, by the following equation (1).
A1=A2+A3×A4×B2 (1)

The increase in cubicle power receiving capacity C4 (= A3 × A4 × B2) due to the addition of electric vehicle chargers can also be expressed as the product of the number of additional electric vehicle chargers B2 and the maximum charging output of each electric vehicle charger (total charging output).
By implementing demand control for electric vehicle chargers, as described later, the increase in cubicle power receiving capacity C4 (= A3 × A4 × B2) associated with the addition of electric vehicle chargers can be suppressed.

In the example shown in Figure 2, in step SE, the electric vehicle charger design support system 1 performs a simulation of the cubicle power receiving capacity. Specifically, in step SE, the cubicle power receiving capacity calculation unit 12A calculates the cubicle power receiving capacity A1 after the electric vehicle charger has been added, as shown, for example, in Figures 3 and 11.

In the example shown in Figure 1, the initial cost calculation unit 12B calculates the initial cost B1 required to start using the electric vehicle chargers as a calculation item, based on at least the number of electric vehicle chargers (number of additional electric vehicle chargers) B2, information about electric vehicle chargers, and information about the cubicle. The information about electric vehicle chargers includes the unit price B3 of the additional electric vehicle chargers. The information about the cubicle includes the cost of increased power receiving equipment B4 (cost of increased power receiving capacity), which is the cost corresponding to the increase in the cubicle's power receiving capacity due to the addition of electric vehicle chargers. The initial cost B1 required to start using the electric vehicle chargers, calculated by the initial cost calculation unit 12B, can be expressed, for example, by the following equation (2).
B1=B3×B2+B4 (2)

Figure 3 is a diagram illustrating an example of calculation performed by the initial cost calculation unit 12B.
In the example shown in Figure 3, the initial cost calculation unit 12B calculates the initial cost B1 when adding an electric vehicle charger to a family-oriented apartment building.
A user of the electric vehicle charger design support system 1 (for example, a designer of electric vehicle chargers) inputs the following as input items into the electric vehicle charger design support system 1: the cubicle power receiving capacity A2 "600 kVA" before the addition of electric vehicle chargers, the number of electric vehicle chargers (number of electric vehicle chargers to be added) B2 "10 units", the unit price B3 "170,000 yen" for the additional electric vehicle chargers (not shown in Figure 3), the estimated charging time C2 "6 hours" for the electric vehicle chargers (additional electric vehicle chargers), the required charge amount per electric vehicle C3 "36 kWh", the rated voltage A3 of the electric vehicle charger, and the rated current A4 of the electric vehicle charger. The acquisition unit 11 acquires this input information, as well as the "contract power calculation formula" and "power receiving equipment information" stored as memory items inside or outside the electric vehicle charger design support system 1.
In other examples, the rated voltage A3 and rated current A4 of the electric vehicle charger may be stored as memory items.

Figure 4 shows an example of a "contract power calculation formula".
As shown in Figure 4, the "contract power calculation formula" as a memory item is a formula that shows the relationship between contract power P and equipment capacity Po (for example, the cubicle power receiving capacity A2 before the addition of electric vehicle chargers).

Figure 5 shows an example of "power receiving equipment information".
As shown in Figure 5, the "power receiving equipment information" as a memory item is information that shows the relationship between the power receiving equipment capacity (for example, cubicle power receiving capacity A2 before the addition of electric vehicle chargers, cubicle power receiving capacity A1 after the addition of electric vehicle chargers, etc.) and the price of the power receiving equipment.

In Figure 3, the charging output "6kW (=36kWh/6 hours)" is information obtained from the assumed charging time C2 "6 hours" at the electric vehicle charger (the additional electric vehicle charger) input by the user of the electric vehicle charger design support system 1 (for example, the designer of the electric vehicle charger) and the required charge amount C3 "36kWh" per electric vehicle (a value calculated by the charging output calculation unit 12D).
In the example shown in Figure 3, the initial cost calculation unit 12B calculates a total charging output of "60 kW," which is the product of the charging output of "6 kW" and the number of electric vehicle chargers (number of additional electric vehicle chargers) B2 of "10 units." The initial cost calculation unit 12B also calculates a charging equipment cost of "1,700,000 yen," which is the product of the unit price of the additional electric vehicle chargers B3 of "170,000 yen" and the number of electric vehicle chargers (number of additional electric vehicle chargers) B2 of "10 units." Furthermore, the cubicle power receiving capacity calculation unit 12A calculates an increase in cubicle power receiving capacity (increased power receiving capacity) C4 of "60 kVA," which is the product of the rated voltage A3 of the electric vehicle charger, the rated current A4 of the electric vehicle charger, and the number of additional electric vehicle chargers B2.

Furthermore, the initial cost calculation unit 12B calculates the contract power "345 (= 0.5 × 600 + 45) kW" before the electric vehicle charger is added, based on the cubicle power receiving capacity A2 "600 kVA" (equipment capacity Po shown in Figure 4) before the electric vehicle charger is added and the "contract power calculation formula" shown in Figure 4. The cubicle power receiving capacity calculation unit 12A calculates the cubicle power receiving capacity A1 "660 (= 600 + 60) kVA" after the electric vehicle charger is added, which is the sum of the cubicle power receiving capacity A2 "600 kVA" before the electric vehicle charger is added and the increase in cubicle power receiving capacity (increased power receiving capacity) C4 "60 kVA" due to the addition of the electric vehicle charger.
Furthermore, the initial cost calculation unit 12B calculates the contracted power after the addition of the electric vehicle charger, which is the sum of the contracted power "345 kW" before the addition of the electric vehicle charger and the total charging output "60 kW", resulting in a contracted power of "405 (= 345 + 60) kW". In addition, the initial cost calculation unit 12B calculates the cost of increased power receiving equipment B4, which corresponds to the cost of the increase in cubicle power receiving capacity due to the addition of the electric vehicle charger, from the power receiving equipment information shown in Figure 5. This cost is the difference between the price of the power receiving equipment (cubicle) after the addition of the electric vehicle charger, "8 million yen", and the price of the power receiving equipment (cubicle) before the addition of the electric vehicle charger, "7 million yen", resulting in an increased power receiving equipment cost of "1 million (= 8 million - 7 million) yen".

In the example shown in Figure 2, in step SF, the calculation unit 12 calculates equipment costs, such as the cost of additional electric vehicle chargers (B2 x B3).

Figure 13 shows an example of the information used by the calculation unit 12 to calculate the cost of an electric vehicle charger (standard charger).
In the example shown in Figure 13, the information (e.g., memory items) used to calculate the cost of a standard charger includes "charging output,""ratedvoltage,""ratedcurrent,""number of devices being charged,""whether or not demand control is present," and "price."

Figure 14 shows an example of the information used by the calculation unit 12 to calculate the cost of an electric vehicle charger (fast charger).
In the example shown in Figure 14, the information (e.g., memory items) used to calculate the cost of the fast charger includes "input voltage,""inputcurrent,""maximum output power,""outputvoltage,""outputcurrent," and "price."

Figure 15 shows an example of information used by the calculation unit 12 to calculate the cost of equipment (solar power generation equipment, battery storage equipment) that can be used in combination with electric vehicle chargers and cubicles.
In the example shown in Figure 15(A), the information (e.g., memory items) used to calculate the cost of the solar power generation equipment includes "capacity" and "price".
In the example shown in Figure 15(B), the information used to calculate the cost of the battery storage system (e.g., memory items) includes "capacity" and "price".

In the example shown in Figure 2, in step SG, the calculation unit 12 calculates the construction costs (labor costs, material costs) for the installation of the additional electric vehicle charger.

Figure 16 shows an example of the information used by the calculation unit 12 to calculate the construction costs (labor costs, material costs) for the installation of an electric vehicle charger, etc.
In the example shown in Figure 16, the information (e.g., stored items) used to calculate the construction costs (labor costs, material costs) for installing additional electric vehicle chargers includes "work rate,""labor cost per unit," and "material cost per unit."

Figure 17 shows an example of the information used by the calculation unit 12 to calculate construction costs (labor costs, material costs) when the building to which an electric vehicle charger is to be added is a family-oriented apartment building.
The "labor costs" shown in Figure 17 are obtained by applying the rules for "work rate" and "labor cost per unit" shown in Figure 16 (e.g., memory items) to the "10 standard chargers" shown in Figure 17 (calculation items). The "material costs" shown in Figure 17 are obtained by applying the rules for "material cost per unit" shown in Figure 16 (e.g., memory items) to the "10 standard chargers" shown in Figure 17 (calculation items).
The "controlled standard charger" and "controlled standard charger + solar power + battery storage system" shown in Figure 17 will be discussed later.

In the example shown in Figure 2, in step SH, the initial cost calculation unit 12B calculates the initial cost B1 (= B3 × B2 + B4) required to start using the electric vehicle charger, for example, as shown in Figures 3 and 11.
In another example, in step SH, the initial cost calculation unit 12B may calculate the initial cost B1 required to start using the electric vehicle charger as the sum of the "equipment cost" calculated in step SF and the "construction cost" calculated in step SG.

Figure 18 shows an example of how the initial cost calculation unit 12B calculates the initial cost B1 required to start using an electric vehicle charger as the sum of "equipment costs" and "construction costs".
In the example shown in Figure 18, "Total Equipment Costs" are calculated as the sum of "Charging Equipment Costs (costs of additional electric vehicle chargers (B3 x B2))", "Increased Power Receiving Equipment Costs (costs corresponding to the increase in cubicle power receiving capacity due to the addition of electric vehicle chargers, B4)", and "Ancillary Equipment Costs (costs of demand control, solar power generation equipment, and battery storage equipment)" (calculation items). "Total Construction Costs" are calculated as the sum of "Personnel Costs" and "Material Costs" as shown in Figure 17 (calculation items). "Total Initial Costs" are calculated as the sum of "Total Equipment Costs" and "Total Construction Costs" as shown in Figure 18 (calculation items).
The "controlled standard charger" and "controlled standard charger + solar power + battery storage system" shown in Figure 18 will be discussed later.

As described above, in the electric vehicle charger design support system 1 of the first embodiment, a standard charger and a rapid charger can be selected (designed) as the electric vehicle charger. In the electric vehicle charger design support system 1 of the first embodiment, the cubicle power receiving capacity calculation unit 12A has a function to calculate the cubicle power receiving capacity A1 after an electric vehicle charger is added when a rapid charger is used as the electric vehicle charger, and a function to calculate the cubicle power receiving capacity A1 after an electric vehicle charger is added when a standard charger is used as the electric vehicle charger.
Furthermore, in the electric vehicle charger design support system 1 of the first embodiment, the initial cost calculation unit 12B has a function to calculate the initial cost B1 required to start using the electric vehicle charger when a fast charger is used as the electric vehicle charger, and a function to calculate the initial cost B1 required to start using the electric vehicle charger when a standard charger is used as the electric vehicle charger.

Figure 11 is a diagram illustrating an example of calculations performed by the initial cost calculation unit 12B, comparing the case where an uncontrolled standard charger is used with the case where a controlled standard charger is used and a storage battery is introduced.
When a battery is introduced using the controlled standard charger shown in Figure 11, demand control (peak shift control), which will be described later, is also applied.

Figure 19 is a diagram illustrating an example of calculations performed by the cubicle power receiving capacity calculation unit 12A and the initial cost calculation unit 12B.
In Figure 19, "controlled" indicates that peak shift and/or peak cut demand control is applied to electric vehicle chargers.
"Demand control" for electric vehicle chargers is a control system that controls the amount of power supplied in real time so as not to exceed the demand value (the average power consumption calculated from the power used over a 30-minute period), as described on the website shown at the URL below.
https://www.kawamura.co.jp/wp/wp-content/uploads/2019/06/Release_20190614.pdf

In the example of a "controlled standard charger," which applies demand control to a "standard charger," the cubicle power receiving capacity A1 after the addition of electric vehicle chargers can be suppressed (set to zero in the example shown in Figure 19) compared to the example of a "standard charger." Therefore, the increase in contracted power after the addition of electric vehicle chargers can be suppressed (avoided in the example shown in Figure 19), and the increase in power receiving equipment costs B4, which corresponds to the increase in cubicle power receiving capacity due to the addition of electric vehicle chargers, can be suppressed (avoided in the example shown in Figure 19).

For example, as described on the website at the URL below, the "peak shift" shown in Figure 19 refers to a case where the time of day when electric vehicle charging takes place is shifted from the daytime, when electricity is used most heavily, to the nighttime, when electricity usage is low, in a building where electric vehicle chargers are being added.
For example, as described on the website at the URL below, the "peak cut" shown in Figure 19 refers to a case where, in a building where electric vehicle chargers are added, electricity is used during peak hours such as daytime, and electricity generated by solar power generation equipment or electricity stored in batteries is used to suppress the increase in contracted power associated with the introduction of electric vehicle chargers.
https://www.enecho.meti.go.jp/category/saving_and_new/saving/summary/pdf/140401_syouenehoukaisei.pdf

In the electric vehicle charger design support system 1 of the first embodiment, as shown in Figure 19, the cubicle power receiving capacity calculation unit 12A has the function of calculating the cubicle power receiving capacity A1 after an electric vehicle charger is added when demand control for electric vehicle chargers is performed (the "power receiving equipment capacity after EV addition of 600 kVA" in the row of "Standard charger with control" in Figure 19), and the function of calculating the cubicle power receiving capacity A1 after an electric vehicle charger is added when demand control for electric vehicle chargers is not performed (the "power receiving equipment capacity after EV addition of 660 kVA" in the row of "Standard charger without control" in Figure 19).
Furthermore, as shown in Figure 19, the initial cost calculation unit 12B has the function of calculating the initial cost B1 required to start using an electric vehicle charger when demand control is performed for the electric vehicle charger (the "charging equipment cost of 4.53 million yen" + "increased power receiving equipment cost of 0 yen" in the row for "standard charger with control" in Figure 19), and the function of calculating the initial cost B1 required to start using an electric vehicle charger when demand control is not performed for the electric vehicle charger (the "charging equipment cost of 1.7 million yen" + "increased power receiving equipment cost of 1 million yen" in the row for "standard charger without control" in Figure 19).

Furthermore, in the electric vehicle charger design support system 1 of the first embodiment, as shown in Figure 19, the cubicle power receiving capacity calculation unit 12A has the function of calculating the cubicle power receiving capacity A1 after an electric vehicle charger is added when demand control and a battery are introduced to the electric vehicle charger (the "power receiving equipment capacity after EV addition of 600 kVA" in the row of "Controlled standard charger + battery introduction" in Figure 19), and the function of calculating the cubicle power receiving capacity A1 after an electric vehicle charger is added when demand control and a battery are not introduced to the electric vehicle charger (the "power receiving equipment capacity after EV addition of 660 kVA" in the row of "Uncontrolled standard charger" in Figure 19).
Furthermore, as shown in Figure 19, the initial cost calculation unit 12B has the function of calculating the initial cost B1 required to start using an electric vehicle charger when demand control and a battery are introduced to the electric vehicle charger (the row in Figure 19 for "Controlled Standard Charger + Battery Introduction" shows "Charging Equipment Cost 4.53 million yen" + "Increased Power Receiving Equipment Cost 0 yen" + "Ancillary Equipment Cost/Battery 12 million yen") and the function of calculating the initial cost B1 required to start using an electric vehicle charger when the electric vehicle charger does not use the power generated by the power generation equipment to charge electric vehicles (the row in Figure 19 for "Uncontrolled Standard Charger" shows "Charging Equipment Cost 1.7 million yen" + "Increased Power Receiving Equipment Cost 1 million yen").

For example, in the "Controlled Standard Charger + Battery Installation" example shown in Figure 19, the electric vehicle charger uses the power stored in the battery to charge the electric vehicle. The cubicle power receiving capacity calculation unit 12A calculates the cubicle power receiving capacity after the addition of the electric vehicle charger, assuming that the electric vehicle charger uses the power stored in the battery to charge the electric vehicle.
For example, in the case of the "uncontrolled standard charger" shown in Figure 19, the electric vehicle charger does not use the power stored in the battery to charge the electric vehicle. The cubicle power receiving capacity calculation unit 12A calculates the cubicle power receiving capacity after the addition of the electric vehicle charger, assuming that the electric vehicle charger does not use the power stored in the battery to charge the electric vehicle.
As described above, in the example of "Controlled Standard Charger + Battery Installation" shown in Figure 19, for example, the electric vehicle charger uses the power stored in the battery to charge the electric vehicle. The initial cost calculation unit 12B calculates the initial cost required to start using the electric vehicle charger when the electric vehicle charger uses the power stored in the battery to charge the electric vehicle. The running cost calculation unit 12C calculates the increase in electricity charges after the addition of the electric vehicle charger compared to the electricity charges before the addition of the electric vehicle charger when the electric vehicle charger uses the power stored in the battery to charge the electric vehicle.
As described above, in the example of the "uncontrolled standard charger" shown in Figure 19, for example, the electric vehicle charger does not use the power stored in the battery to charge the electric vehicle. The initial cost calculation unit 12B calculates the initial cost required to start using the electric vehicle charger when the electric vehicle charger does not use the power stored in the battery to charge the electric vehicle. The running cost calculation unit 12C calculates the increase in electricity charges after the addition of the electric vehicle charger compared to the electricity charges before the addition of the electric vehicle charger when the electric vehicle charger does not use the power stored in the battery to charge the electric vehicle.

Furthermore, in the electric vehicle charger design support system 1 of the first embodiment, as shown in Figure 19, the cubicle power receiving capacity calculation unit 12A has the function of calculating the cubicle power receiving capacity A1 after an electric vehicle charger is added when the electric vehicle charger uses the power generated by the power generation equipment to charge the electric vehicle (the "power receiving equipment capacity after EV addition of 600 kVA" in the row of "Controlled ordinary charger + solar power + storage battery introduction" in Figure 19), and the function of calculating the cubicle power receiving capacity A1 after an electric vehicle charger is added when the electric vehicle charger does not use the power generated by the power generation equipment to charge the electric vehicle (the "power receiving equipment capacity after EV addition of 660 kVA" in the row of "Uncontrolled ordinary charger" in Figure 19).
Furthermore, as shown in Figure 19, the initial cost calculation unit 12B has the function of calculating the initial cost B1 required to start using an electric vehicle charger when the electric vehicle charger uses the power generated by the power generation equipment to charge electric vehicles (the row in Figure 19 for "Controlled standard charger + solar power + storage battery installation" shows "Charging equipment cost of 4.53 million yen" + "Increased power receiving equipment cost of 0 yen" + "Ancillary equipment cost - solar power of 18 million yen" + "Ancillary equipment cost - storage battery of 12 million yen") and the function of calculating the initial cost B1 required to start using an electric vehicle charger when the electric vehicle charger does not use the power generated by the power generation equipment to charge electric vehicles (the row in Figure 19 for "Uncontrolled standard charger" shows "Charging equipment cost of 1.7 million yen" + "Increased power receiving equipment cost of 1 million yen").

In the example shown in Figure 1, the running cost calculation unit 12C calculates the running cost C1, which is the increase in electricity charges after the addition of the electric vehicle chargers compared to the electricity charges before the addition of the electric vehicle chargers, based on at least the number of electric vehicle chargers (number of additional electric vehicle chargers) B2, the estimated charging time C2 at the electric vehicle chargers (additional electric vehicle chargers), the required charge amount C3 per electric vehicle, the increase in cubicle power receiving capacity C4 (= A3 × A4 × B2) due to the addition of the electric vehicle chargers, the electric vehicle charging information C5, and the electricity rate unit price C6.

In the example shown in Figure 2, in step SI, the calculation unit 12 calculates the running cost C1 (electricity cost = power × charging time × electricity rate per unit).

Figure 6 is a diagram illustrating an example of calculation performed by the running cost calculation unit 12C.
In the example shown in Figure 6, the running cost calculation unit 12C calculates the running cost C1 when an electric vehicle charger (uncontrolled standard charger) is added to a family-oriented apartment building. In order for the running cost calculation unit 12C to calculate the running cost C1, the user of the electric vehicle charger design support system 1 (for example, the designer of the electric vehicle charger) inputs the following as input items into the electric vehicle charger design support system 1: the cubicle power receiving capacity A2 "600 kVA" before the electric vehicle charger is added, the number of electric vehicle chargers (number of electric vehicle chargers to be added) B2 "10 units", the estimated charging time C2 "6 hours" at the electric vehicle charger (the electric vehicle charger to be added), and the required charge amount C3 "36 kWh" per electric vehicle. The acquisition unit 11 acquires the input information, electric vehicle charging information C5 stored internally or externally in the electric vehicle charger design support system 1, and the electricity rate unit price C6 of the power company contracted by the family-oriented apartment building.
Electric vehicle charging information C5 predicts and estimates electric vehicle charging information (number of vehicles starting charging at different times of day) based on the type of building (e.g., family apartments, apartments for single people, supermarkets, mixed-use buildings, small retail stores, etc.).
In Figure 6, similar to the example shown in Figure 3, the charging output "6kW (=36kWh/6 hours)" is information obtained from the assumed charging time C2 "6 hours" at the electric vehicle charger (the additional electric vehicle charger) input by the user of the electric vehicle charger design support system 1 (for example, the designer of the electric vehicle charger) and the required charge amount C3 "36kWh" per electric vehicle (a value calculated by the charging output calculation unit 12D).

In the example shown in Figure 6, the running cost calculation unit 12C calculates "110,000 yen" as the running cost C1, which corresponds to the increase in electricity charges after the addition of the electric vehicle charger compared to the electricity charges before the addition of the electric vehicle charger, which is the increase in the basic charge per month (= increase in cubicle power receiving capacity due to the addition of the electric vehicle charger C4 (= A3 × A4 × B2) × electricity rate unit price C6).
Furthermore, the running cost calculation unit 12C calculates a running cost C1 that corresponds to the increase in electricity charges after the addition of the electric vehicle charger compared to the electricity charges before the addition of the electric vehicle charger, which is the increase in electricity usage charges per month (= electric vehicle charging information C5 × electricity rate per unit C6) of "160,000 yen".
Furthermore, the running cost calculation unit 12C calculates a running cost C1 that corresponds to the increase in electricity charges after the addition of electric vehicle chargers compared to the electricity charges before the addition of electric vehicle chargers. This C1 is calculated as the increase in the basic electricity charge per 12 months (1 year) (≒ 110,000 yen/month × 12 months), which is "1,360,000 yen".
Furthermore, the running cost calculation unit 12C calculates a running cost C1 that corresponds to the increase in electricity charges after the addition of electric vehicle chargers compared to the electricity charges before the addition of electric vehicle chargers, which is the increase in electricity usage charges per 12 months (1 year) (≒ 160,000 yen × 12 months) "1,890,000 yen".
Furthermore, the running cost calculation unit 12C calculates a running cost C1 that corresponds to the increase in electricity charges after the addition of electric vehicle chargers compared to the electricity charges before the addition of electric vehicle chargers. This C1 is the sum of the increase in the basic electricity charge per 12 months (1 year) of "1.36 million yen" and the increase in the electricity usage charge per 12 months (1 year) of "1.89 million yen," totaling "3.25 million yen (= 1.36 million + 1.89 million yen)."

Furthermore, in the electric vehicle charger design support system 1 of the first embodiment, since both a standard charger and a rapid charger can be selected (designed) as the electric vehicle charger, the running cost calculation unit 12C has the function of calculating the increase in electricity charges (running cost C1) after the addition of the electric vehicle charger relative to the electricity charges before the addition of the electric vehicle charger when a rapid charger is used as the electric vehicle charger, and the function of calculating the increase in electricity charges (running cost C1) after the addition of the electric vehicle charger relative to the electricity charges before the addition of the electric vehicle charger when a standard charger is used as the electric vehicle charger (the "running cost of 3.25 million yen" in the row for "no control" and "standard charger" in Figure 12).

Figure 12 is a diagram illustrating an example of calculations performed by the running cost calculation unit 12C, comparing the case where an uncontrolled standard charger is used with the case where a controlled standard charger is used and a storage battery is introduced.
When a controlled standard charger, as shown in Figure 12, is used and a battery is introduced (as indicated by "controlled standard charger + battery introduction"), demand control (peak shift control), which will be described later, is also applied.

In the example shown in Figure 12, when "Controlled standard charger + battery storage system installed," the running cost calculation unit 12C calculates "0 yen" as the running cost C1, which corresponds to the increase in electricity charges after the addition of the electric vehicle charger compared to the electricity charges before the addition of the electric vehicle charger, which is the increase in the basic charge per month (= increase in cubicle power receiving capacity due to the addition of the electric vehicle charger C4 (= A3 × A4 × B2 = 0 yen) × electricity rate unit price C6).
Furthermore, when the system is described as "controlled standard charger + battery installation," the running cost calculation unit 12C calculates a running cost C1 that corresponds to the increase in electricity charges after the addition of the electric vehicle charger compared to the electricity charges before the addition of the electric vehicle charger. This increase in electricity charges per month (= electric vehicle charging information C5 × electricity rate per unit C6) is calculated as "140,000 yen (< 160,000 yen)." Because peak shift control is performed, the usage charges are reduced compared to the case described as "uncontrolled standard charger."
Furthermore, when the system is described as "Controlled standard charger + battery installation," the running cost calculation unit 12C calculates "0 yen" as the running cost C1, which is the increase in the basic electricity charge per 12 months (1 year) (≒ 0 yen/month × 12 months) that corresponds to the increase in the electricity charge after the addition of the electric vehicle charger compared to the electricity charge before the addition of the electric vehicle charger.
Furthermore, when the system is described as "controlled standard charger + battery installation," the running cost calculation unit 12C calculates a running cost C1 that corresponds to the increase in electricity charges after the addition of the electric vehicle charger compared to the electricity charges before the addition of the electric vehicle charger. This C1 is calculated as the increase in electricity charges per 12 months (1 year) (approximately 140,000 yen x 12 months), which is "1,740,000 yen."
Furthermore, when the system is described as "Controlled standard charger + battery installation," the running cost calculation unit 12C calculates a running cost C1 that corresponds to the increase in electricity charges after the addition of the electric vehicle charger compared to the electricity charges before the addition of the electric vehicle charger. This C1 is the sum of the increase in the basic electricity charge per 12 months (1 year) of "0 yen" and the increase in the electricity usage charge per 12 months (1 year) of "1,740,000 yen," totaling "1,740,000 yen (= 0 + 1,740,000 yen)."

Figure 20 shows an example of the information (electricity rate unit price C6) used by the calculation unit 12 to calculate the running cost C1.
In Figure 20, "nighttime" refers to the period from 10 PM to 8 AM, "summer" refers to the period from July 1st to September 30th, and "peak" corresponds to the period from 10 AM to 5 PM every day during the summer.

Figures 21 and 22 show other examples of information used by the calculation unit 12 to calculate the running cost C1 (electric vehicle charging information by building use (e.g., charging usage time (estimated charging time C2))). Figure 23 is a graph of the values shown in Figures 21 and 22.
For example, as shown in Figures 21 to 23, electric vehicle charging information (number of vehicles starting to charge at different times of the day) is stored as a memory item in the electric vehicle charger design support system 1, either internally or externally, according to the type of building use (family apartments, apartments for single people, supermarkets, mixed-use buildings, small retail stores, etc.) (the example shown in Figures 21 to 23 is "family apartments"). Figures 21 to 23 show sample values for the case where a "normal charger without control," which is a normal charger to which demand control (peak shifting) is not applied, is introduced, with the number of electric vehicle chargers set to, for example, 10.
In the examples shown in Figures 21 to 23, the calculation unit 12 calculates the amount of electricity used for each time period ("EV electricity usage" in Figure 21) from the electric vehicle charging information C5 as a memory item and the charging time of 6 hours (assumed charging time C2) and charging output of 6 kW (= C3/C2) as input items.
In the examples shown in Figures 21 to 23, the electric vehicle charger design support system 1 calculates as a simulation result that it is necessary to increase the contracted power when introducing a "non-controlled standard charger," which is a standard charger to which demand control (peak shifting) is not applied, as shown in Figure 23.

Figures 24 and 25 show further examples of information used by the calculation unit 12 to calculate running costs (electric vehicle charging information by building use (e.g., charging usage time (estimated charging time C2))). Figure 26 is a graph of the values shown in Figures 24 and 25.
Figures 24 to 26 show sample values for the number of electric vehicle chargers, for example, 10, when introducing "controlled standard chargers" to which demand control (peak shifting) is applied.
In the examples shown in Figures 24 to 26, as in the examples shown in Figures 21 to 23, the calculation unit 12 calculates the amount of electricity used for each time period ("EV electricity used" in Figure 24) from the electric vehicle charging information C5 as a memory item and the charging time of 6 hours (assumed charging time C2) and charging output of 6 kW (= C3/C2) as input items.
In the examples shown in Figures 24 to 26, the electric vehicle charger design support system 1 calculates, as shown in Figure 24, that by applying demand control (peak shifting), the peak of "power consumption before adding EVs" remains unchanged and becomes the "total power consumption" after the electric vehicle charger is added.
In detail, in the example shown in Figure 24, considering that the peak usage corresponds to the contracted power, peak shifting is performed to avoid charging electric vehicles during peak usage times, and the peak usage is shifted to times when usage charges are lower (i.e., the time of electric vehicle charging is shifted).
In the examples shown in Figures 24 to 26, the electric vehicle charger design support system 1 calculates, as shown in Figure 26, that it is not necessary to increase the contracted power when introducing a "controlled standard charger" to which demand control (peak shifting) is applied.

Figure 27 is a diagram illustrating an example of calculations performed by the running cost calculation unit 12C.
In the example shown in Figure 27, the running cost calculation unit 12C calculates the running costs when adding the "uncontrolled standard charger" shown in Figure 6, the running costs when adding the "controlled standard charger + battery storage system" shown in Figure 12, the running costs when adding the "controlled standard charger," and the running costs when adding the "controlled standard charger + solar power + battery storage system."

In the example shown in Figure 27, when it is indicated as a "controlled standard charger," the running cost calculation unit 12C calculates "0 yen" as the running cost C1, which corresponds to the increase in electricity charges after the addition of the electric vehicle charger compared to the electricity charges before the addition of the electric vehicle charger, which is the increase in the basic charge per month (= increase in cubicle power receiving capacity due to the addition of the electric vehicle charger C4 (= A3 × A4 × B2 = 0 yen) × electricity rate unit price C6).
Furthermore, when referring to a "controlled standard charger," the running cost calculation unit 12C calculates a running cost C1 that corresponds to the increase in electricity charges after the addition of the electric vehicle charger compared to the electricity charges before the addition of the electric vehicle charger. This increases the monthly electricity usage charge (= electric vehicle charging information C5 × electricity rate unit price C6) to "140,000 yen (< 160,000 yen)." Because peak shift control is performed, the usage charge is reduced compared to when referring to a "non-controlled standard charger."
Furthermore, when referring to a "controlled standard charger," the running cost calculation unit 12C calculates "0 yen" as the running cost C1, which corresponds to the increase in electricity charges after the addition of the electric vehicle charger compared to the electricity charges before the addition of the electric vehicle charger, which is the increase in the basic electricity charge per 12 months (1 year) (≒ 0 yen/month × 12 months).
Furthermore, when referring to a "controlled standard charger," the running cost calculation unit 12C calculates a running cost C1 that corresponds to the increase in electricity charges after the addition of the electric vehicle charger compared to the electricity charges before the addition of the electric vehicle charger. This C1 is calculated as the increase in electricity charges per 12 months (1 year) (≒ 140,000 yen × 12 months), which is "1,740,000 yen."
Furthermore, when referring to a "controlled standard charger," the running cost calculation unit 12C calculates a running cost C1 that corresponds to the increase in electricity charges after the addition of the electric vehicle charger compared to the electricity charges before the addition of the electric vehicle charger. This C1 is the sum of the increase in the basic electricity charge per 12 months (1 year) of "0 yen" and the increase in the electricity usage charge per 12 months (1 year) of "1,740,000 yen," totaling "1,740,000 yen (= 0 + 1,740,000 yen)."

In other words, in the electric vehicle charger design support system 1 of the first embodiment, the running cost calculation unit 12C has the function of calculating the increase in electricity charges after the addition of an electric vehicle charger (running cost C1) relative to the electricity charges before the addition of the electric vehicle charger when demand control of the electric vehicle charger is performed (the "running cost of 1.74 million yen" in the row for "Standard charger with control" in Figure 27), and the function of calculating the increase in electricity charges after the addition of an electric vehicle charger relative to the electricity charges before the addition of the electric vehicle charger when demand control of the electric vehicle charger is not performed (the "running cost of 3.25 million yen" in the row for "Standard charger without control" in Figure 27).

Furthermore, in the example shown in Figure 27, when "controlled standard charger + solar power + storage battery installation" is shown, the running cost calculation unit 12C calculates "0 yen" as the running cost C1, which corresponds to the increase in electricity charges after the addition of the electric vehicle charger compared to the electricity charges before the addition of the electric vehicle charger, which is the increase in the basic charge per month (= increase in cubicle power receiving capacity due to the addition of the electric vehicle charger C4 (= A3 × A4 × B2 = 0 yen) × electricity rate unit price C6).
Furthermore, when the system is described as "controlled standard charger + solar power + battery storage," the running cost calculation unit 12C calculates the running cost C1 as the increase in electricity charges after the addition of the electric vehicle charger compared to the electricity charges before the addition of the electric vehicle charger. This increase in electricity charges per month (= electric vehicle charging information C5 × electricity rate per unit C6) is calculated as "140,000 yen (< 160,000 yen)." Because peak shift control is performed, the usage charges are reduced compared to the case described as "uncontrolled standard charger."
Furthermore, when referring to "Controlled standard charger solar power + storage battery installation," the running cost calculation unit 12C calculates "0 yen" as the running cost C1, which corresponds to the increase in electricity charges after the addition of the electric vehicle charger compared to the electricity charges before the addition of the electric vehicle charger, which is the increase in the basic electricity charge per 12 months (1 year) (≒ 0 yen/month × 12 months).
Furthermore, when the system is described as "controlled standard charger + solar power + battery storage system," the running cost calculation unit 12C calculates a running cost C1 that corresponds to the increase in electricity charges after the addition of the electric vehicle charger compared to the electricity charges before the addition of the electric vehicle charger. This C1 is calculated as the increase in electricity charges per 12 months (1 year) (approximately 140,000 yen x 12 months), which is "1,740,000 yen."
Furthermore, when the system is described as "controlled standard charger + solar power + battery storage system," the running cost calculation unit 12C calculates a running cost C1 that corresponds to the increase in electricity charges after the addition of the electric vehicle charger compared to the electricity charges before the addition of the electric vehicle charger. This C1 is the sum of the increase in the basic electricity charge per 12 months (1 year) of "0 yen" and the increase in the electricity usage charge per 12 months (1 year) of "1,740,000 yen," totaling "1,740,000 yen (= 0 + 1,740,000 yen)."

In other words, in the electric vehicle charger design support system 1 of the first embodiment, the running cost calculation unit 12C has the function of calculating the increase in electricity charges after the addition of the electric vehicle charger (running cost C1) relative to the electricity charges before the addition of the electric vehicle charger when the electric vehicle charger uses the power generated by the power generation equipment to charge the electric vehicle (the "running cost of 1.74 million yen" in the row for "Controlled standard charger + solar power + battery storage introduction" in Figure 27), and the increase in electricity charges after the addition of the electric vehicle charger (running cost C1) relative to the electricity charges before the addition of the electric vehicle charger when the electric vehicle charger does not use the power generated by the power generation equipment to charge the electric vehicle (the "running cost of 3.25 million yen" in the row for "Uncontrolled standard charger" in Figure 27).

In the example shown in Figure 2, in step SJ, the calculation unit 12 calculates the amount of electricity cost reduction due to demand control (= electricity cost × demand control reduction rate).

In the example shown in Figure 27, when "controlled standard charger + battery installation" is shown, the calculation unit 12 calculates the reduction in running costs compared to when "uncontrolled standard charger" is shown as "1.51 million yen (= 3.25 million - 1.74 million yen/year)". The calculation unit 12 also calculates the higher initial cost (see Figure 18) when "controlled standard charger + battery installation" is shown as "11.83 million yen (= 15.5 million - 3.67 million yen)". Furthermore, the calculation unit 12 calculates the recovery period for the higher initial cost when "controlled standard charger + battery installation" is shown as "7.8 years (≒ 11.83 million yen / 1.51 million yen/year)".
When a "controlled standard charger" is used, the calculation unit 12 calculates a reduction in running costs of "1.51 million yen (= 3.25 million - 1.74 million yen/year)" compared to when a "non-controlled standard charger" is used. The calculation unit 12 also calculates a higher initial cost (see Figure 18) of "1.83 million yen (= 5.5 million - 3.67 million yen)" when a "controlled standard charger" is used compared to when a "non-controlled standard charger" is used. Furthermore, the calculation unit 12 calculates the recovery period for the higher initial cost when a "controlled standard charger" is used compared to when a "non-controlled standard charger" is used: "1.2 years (≒ 1.83 million yen / 1.51 million yen/year)".
When the system is described as "controlled standard charger + solar power + battery storage," the calculation unit 12 calculates a reduction in running costs of "1.51 million yen (= 3.25 million - 1.74 million yen/year)" compared to the case of "uncontrolled standard charger." The calculation unit 12 also calculates a higher initial cost (see Figure 18) of "26.83 million yen (= 30.5 million - 3.67 million yen)" when the system is described as "controlled standard charger + solar power + battery storage" compared to the case of "uncontrolled standard charger." Furthermore, the calculation unit 12 calculates the recovery period for the higher initial cost when the system is described as "controlled standard charger" compared to the case of "uncontrolled standard charger" as "17.7 years (≒ 26.83 million yen / 1.51 million yen/year)."

In the example shown in Figure 1, the charging output calculation unit 12D calculates the charging output (6kW (=36kWh/6 hours) in the example shown in Figures 3 and 6) by dividing the required charge amount C3 per electric vehicle (36kWh in the example shown in Figures 3 and 6) by the assumed charging time C2 (6 hours in the example shown in Figures 3 and 6) at the additional electric vehicle charger.

In the example shown in Figure 2, in step SK, the electric vehicle charger design support system 1 performs a simulation termination determination (STEP 4.5) to determine whether or not to terminate the simulation.

Figure 28 is a diagram illustrating an example of the simulation termination determination (STEP 4.5) performed in the electric vehicle charger design support system 1 during step SK of Figure 2.
In the example shown in Figure 28, in step S30, the determination unit 13 determines whether or not to terminate the simulation.

Figure 29 illustrates the case where it is necessary to increase the power receiving capacity of the cubicle and redo the simulation.
As shown in Figure 29, in the case of a building where the basic charge (contracted power) is determined by a peak within a gentle curve in the graph of electricity usage before the addition of electric vehicle chargers, even if the peak is shifted, the electricity usage of electric vehicle chargers may not fit within the surplus capacity, causing the peak to change and necessitating an increase in contracted power.

Therefore, in the example shown in Figure 28, the determination unit 13 determines in step S30 whether or not to terminate the simulation. In the case shown in the example in Figure 29, the determination unit 13 determines not to terminate the simulation and proceeds to step S31. On the other hand, if the determination unit 13 determines to terminate the simulation, the process proceeds to step S34.
In step S31, the determination unit 13 determines whether or not to increase the power receiving capacity of the cubicle. If it is necessary to increase the power receiving capacity of the cubicle and increase the contracted power, as in the example shown in Figure 29, the process proceeds to step S32. On the other hand, if the power receiving capacity of the cubicle is not to be increased, the process returns to step S13 in Figure 8.
In step S32, the electric vehicle charger design support system 1 receives input from a user of the electric vehicle charger design support system 1 regarding the increased capacity of the cubicle.
Next, in step S33, the processing unit 14 saves the increased capacity of the cubicle that was input in step S32, and terminates the process "STEP0" shown in Figures 7 to 10.

In step S34, the system configuration diagram generation unit 15 generates a system configuration diagram showing the system including the additional electric vehicle charger, etc.

Figures 30 to 32 show examples of system configuration diagrams generated by the system configuration diagram generation unit 15. Specifically, Figure 30 shows an example of a system including a "non-controlled standard charger" (an electric vehicle charger without demand control), Figure 31 shows an example of a system including a "controlled standard charger" (an electric vehicle charger with demand control), and Figure 32 shows an example of a system including a "fast charger."

According to the electric vehicle charger design support system 1 of the first embodiment, electric vehicle charger designers and others can obtain information on cubicle power receiving capacity, initial costs, and running costs by inputting minimal information into the electric vehicle charger design support system 1.

<Second Embodiment>
The following describes a second embodiment of the electric vehicle charger design support system, electric vehicle charger design support method, and program of the present invention.
The electric vehicle charger design support system 1 of the second embodiment is configured in the same way as the electric vehicle charger design support system 1 of the first embodiment described above, except for the points described later. Therefore, the electric vehicle charger design support system 1 of the second embodiment can achieve the same effects as the electric vehicle charger design support system 1 of the first embodiment described above, except for the points described later.

The electric vehicle charger design support system 1 of the first embodiment described above is located, for example, inside a server device managed by a business operator that provides electric vehicle charger design support services.
On the other hand, the electric vehicle charger design support system 1 of the second embodiment is composed of terminal devices such as a personal computer or smartphone used by a user of the electric vehicle charger design support system 1 (for example, a designer of electric vehicle chargers).

The embodiments for carrying out the present invention have been described above using examples, but the present invention is not limited in any way to these embodiments, and various modifications and substitutions can be made without departing from the spirit of the invention. The configurations described in each of the embodiments and examples above may be combined.

Furthermore, the functions of all or part of the components of the electric vehicle charger design support system 1 in the above-described embodiment may also be realized by recording a program for realizing these functions on a computer-readable recording medium, loading the program recorded on this recording medium into a computer system, and executing it. The term "computer system" here includes hardware such as an operating system and peripheral devices.
Furthermore, "computer-readable recording media" refers to portable media such as flexible disks, magneto-optical disks, ROMs, and CD-ROMs, as well as storage units such as hard disks built into computer systems. In addition, "computer-readable recording media" may also include those that dynamically hold programs for a short period of time, such as communication lines used when transmitting programs over networks such as the Internet or communication lines such as telephone lines, and those that hold programs for a certain period of time, such as volatile memory inside computer systems that act as servers or clients in such cases. Moreover, the above-mentioned programs may be for the purpose of realizing some of the functions described above, and may also be programs that can realize the aforementioned functions in combination with programs already recorded in the computer system.

1…Electric Vehicle Charger Design Support System, 11…Acquisition Unit, 12…Calculation Unit, 12A…Cubicle Power Receiving Capacity Calculation Unit, 12B…Initial Cost Calculation Unit, 12C…Running Cost Calculation Unit, 12D…Charging Output Calculation Unit, 13…Determination Unit, 14…Processing Unit, 15…System Configuration Diagram Generation Unit

Claims (6)

An electric vehicle charger design support system that assists in the design of electric vehicle chargers,
An acquisition unit that acquires information used in the design of the electric vehicle charger,
The system comprises a calculation unit that calculates a calculation item from the information acquired by the acquisition unit,
The information acquired by the acquisition unit includes at least the number of electric vehicle chargers, the estimated charging time at each electric vehicle charger, the required charge amount per electric vehicle, information regarding the electric vehicle chargers, the cubicle power receiving capacity before the addition of the electric vehicle chargers, electric vehicle charging information, and the electricity rate per unit.
The calculation unit described above,
A cubicle power receiving capacity calculation unit calculates the cubicle power receiving capacity after the addition of the electric vehicle charger, based on the cubicle power receiving capacity before the addition of the electric vehicle charger and information regarding the electric vehicle charger, as the calculation item.
An initial cost calculation unit calculates the initial cost required to start using the electric vehicle charger, based on at least the number of electric vehicle chargers, information regarding the electric vehicle chargers, and information regarding the cubicle, as the calculation item.
The system includes a running cost calculation unit that calculates, as a calculation item, a running cost equivalent to the increase in electricity charges after the addition of the electric vehicle chargers compared to the electricity charges before the addition of the electric vehicle chargers, based on at least the number of electric vehicle chargers, the estimated charging time at the electric vehicle chargers, the required charge amount per electric vehicle, the increase in the cubicle power receiving capacity due to the addition of the electric vehicle chargers, electric vehicle charging information, and the electricity rate per unit,
Electric vehicle charger design support system. The cubicle power receiving capacity calculation unit is:
A function to calculate the cubicle power receiving capacity after the addition of the electric vehicle charger when demand control for the electric vehicle charger is performed,
It has a function to calculate the cubicle power receiving capacity after the addition of the electric vehicle charger when demand control for the electric vehicle charger is not performed,
The aforementioned initial cost calculation unit,
A function to calculate the initial cost required to start using the electric vehicle charger when demand control is performed for the electric vehicle charger,
It has a function to calculate the initial cost required to start using the electric vehicle charger when demand control for the electric vehicle charger is not performed,
The aforementioned running cost calculation unit,
A function to calculate the increase in electricity charges after the addition of the electric vehicle charger, relative to the electricity charges before the addition of the electric vehicle charger, when demand control of the electric vehicle charger is performed.
The system has a function to calculate the increase in electricity charges after the addition of the electric vehicle charger, relative to the electricity charges before the addition of the electric vehicle charger, when demand control for the electric vehicle charger is not performed.
The electric vehicle charger design support system according to claim 1. The cubicle power receiving capacity calculation unit is:
A function to calculate the cubicle power receiving capacity after the addition of the electric vehicle charger when the electric vehicle charger uses the power stored in the battery to charge the electric vehicle,
The electric vehicle charger has a function to calculate the cubicle power receiving capacity after the electric vehicle charger is added, when the electric vehicle charger does not use the power stored in the battery to charge the electric vehicle.
The aforementioned initial cost calculation unit,
A function to calculate the initial costs required to start using the electric vehicle charger when the electric vehicle charger uses the power stored in the battery to charge the electric vehicle,
The electric vehicle charger has a function to calculate the initial cost required to start using the electric vehicle charger when the electricity stored in the battery is not used to charge the electric vehicle.
The aforementioned running cost calculation unit,
A function to calculate the increase in electricity charges after the addition of the electric vehicle charger, relative to the electricity charges before the addition of the electric vehicle charger, when the electric vehicle charger uses the power stored in the battery to charge the electric vehicle,
The system has a function to calculate the increase in electricity charges after the addition of the electric vehicle charger, relative to the electricity charges before the addition of the electric vehicle charger, when the electric vehicle charger does not use the power stored in the battery to charge the electric vehicle.
The electric vehicle charger design support system according to claim 1. The cubicle power receiving capacity calculation unit is:
A function to calculate the cubicle power receiving capacity after the addition of the electric vehicle charger when the electric vehicle charger uses the power generated by the power generation equipment to charge the electric vehicle,
The electric vehicle charger has a function to calculate the cubicle power receiving capacity after the electric vehicle charger is added, in the case where the electric vehicle charger does not use the power generated by the power generation equipment to charge the electric vehicle.
The aforementioned initial cost calculation unit,
The function calculates the initial costs required to start using the electric vehicle charger when the electric vehicle charger uses the power generated by the power generation equipment to charge the electric vehicle,
The electric vehicle charger has a function to calculate the initial costs required to start using the electric vehicle charger when the electric vehicle charger does not use the power generated by the power generation equipment to charge the electric vehicle,
The aforementioned running cost calculation unit,
A function to calculate the increase in electricity charges after the addition of the electric vehicle charger, relative to the electricity charges before the addition of the electric vehicle charger, when the electric vehicle charger uses the power generated by the power generation equipment to charge the electric vehicle,
The system has a function to calculate the increase in electricity charges after the addition of the electric vehicle charger, relative to the electricity charges before the addition of the electric vehicle charger, when the electric vehicle charger does not use the power generated by the power generation equipment to charge the electric vehicle.
The electric vehicle charger design support system according to claim 1. A method for supporting the design of electric vehicle chargers,
An acquisition step to acquire information used in the design of the aforementioned electric vehicle charger,
The system comprises a calculation step which calculates a calculation item from the information acquired in the acquisition step,
The information acquired in the acquisition step includes at least the number of electric vehicle chargers, the estimated charging time at each electric vehicle charger, the required charge amount per electric vehicle, information regarding the electric vehicle chargers, the cubicle power receiving capacity before the addition of the electric vehicle chargers, electric vehicle charging information, and the electricity rate per unit.
The calculation step includes:
A cubicle power receiving capacity calculation step, which calculates the cubicle power receiving capacity after the addition of the electric vehicle charger, based on the cubicle power receiving capacity before the addition of the electric vehicle charger and information regarding the electric vehicle charger, as the calculation item,
Based on at least the number of electric vehicle chargers, information regarding the electric vehicle chargers, and information regarding the cubicles, the calculation items include an initial cost calculation step that calculates the initial cost required to start using the electric vehicle chargers,
The calculation includes a running cost calculation step that calculates, as a calculation item, the running cost equivalent to the increase in electricity charges after the addition of the electric vehicle chargers compared to the electricity charges before the addition of the electric vehicle chargers, based on at least the number of electric vehicle chargers, the estimated charging time at the electric vehicle chargers, the required charge amount per electric vehicle, the increase in the cubicle power receiving capacity due to the addition of the electric vehicle chargers, electric vehicle charging information, and the unit price of electricity charges.
A method for supporting the design of electric vehicle chargers. On the computer,
An acquisition step to obtain information used in the design of electric vehicle chargers,
A program for executing a calculation step which calculates a calculation item from the information acquired in the acquisition step,
The information acquired in the acquisition step includes at least the number of electric vehicle chargers, the estimated charging time at each electric vehicle charger, the required charge amount per electric vehicle, information regarding the electric vehicle chargers, the cubicle power receiving capacity before the addition of the electric vehicle chargers, electric vehicle charging information, and the electricity rate per unit.
The calculation step includes:
A cubicle power receiving capacity calculation step, which calculates the cubicle power receiving capacity after the addition of the electric vehicle charger, based on the cubicle power receiving capacity before the addition of the electric vehicle charger and information regarding the electric vehicle charger, as the calculation item,
Based on at least the number of electric vehicle chargers, information regarding the electric vehicle chargers, and information regarding the cubicles, the calculation items include an initial cost calculation step that calculates the initial cost required to start using the electric vehicle chargers,
The calculation includes a running cost calculation step that calculates, as a calculation item, the running cost equivalent to the increase in electricity charges after the addition of the electric vehicle chargers compared to the electricity charges before the addition of the electric vehicle chargers, based on at least the number of electric vehicle chargers, the estimated charging time at the electric vehicle chargers, the required charge amount per electric vehicle, the increase in the cubicle power receiving capacity due to the addition of the electric vehicle chargers, electric vehicle charging information, and the unit price of electricity charges.
program.