JP7444584B2 - Power control system, power control device, power control method and program - Google Patents

Description

The present disclosure relates to a power control system, a power control device, a power control method, and a program.

In recent years, there is a system in which an electric power company that manages electricity supply and demand in a predetermined area submits an electricity procurement plan to a wide-area organization, and controls the electricity demand in a predetermined area according to this procurement plan (for example, Patent Document 1 reference).

JP 2019-126157 Publication

In the system described above, it is desirable that the actual value of power demand in a predetermined area match the procurement plan in units of a predetermined period, that is, the procurement plan is achieved.

An object of the present disclosure is to provide a power control system, a power control device, a power control method, and a program that can improve the achievement rate of a power procurement plan in a predetermined area.

A power control system according to an embodiment includes a power storage device, a first power control device, and a second power control device. The first power control device controls charging and discharging of the power storage device in units of a predetermined period according to a power procurement plan in a predetermined area. The second power control device determines whether to perform imbalance adjustment to adjust the power demand in the predetermined area during the predetermined period based on the error between the procurement plan and the actual value of the power demand in the predetermined area. Determine. When determining that the imbalance adjustment is to be performed, the second power control device controls charging and discharging of the power storage device. The first power control device and the second power control device are each assigned a charge/discharge amount that can be charged/discharged to the power storage device in units of the predetermined period. The first power control device determines whether or not to perform a peak cut or peak shift of power demand in a predetermined area within the allocated chargeable/dischargeable amount, and issues a control instruction based on the determination to the first power control device. 2 Send to the power control device. When performing the imbalance adjustment, the second power control device compares the amount of charging and discharging allocated to the second power control device during the predetermined period and the amount of charging and discharging allocated to the first power control device during the predetermined period. The charging and discharging of the power storage device is controlled within the range of the amount of charging and discharging including the amount of discharging.

Further, the power control device according to one embodiment includes a control section. The control unit draws up a power procurement plan in a predetermined area, and controls charging and discharging of the power storage device in the predetermined area in accordance with the drawn up procurement plan in units of a predetermined period. Based on the error between the obtained procurement plan and the actual value of power demand in the predetermined area, it is determined whether or not to perform imbalance adjustment to adjust the power demand in the predetermined area during the predetermined period. When determining that the imbalance adjustment is to be performed, the control unit controls charging and discharging of the power storage device. The power control device and the other power control device are each assigned a charge/discharge amount that can be charged/discharged to the power storage device in units of the predetermined period. The other power control device determines whether to perform a peak cut or peak shift of power demand in a predetermined area within the allocated chargeable/dischargeable amount, and issues a control instruction based on the determination to the power Send to control device . When performing the imbalance adjustment, the control unit combines the charge and discharge amount allocated to the power control device during the predetermined period with the charge and discharge amount allocated to the other power control device during the predetermined period. The amount of charge and discharge of the power storage device is controlled within the range of the amount of charge and discharge.

Further, a power control method in a power control device according to an embodiment includes a determination step and a control step. In the determination step, a power procurement plan is drawn up in a predetermined area, and according to the drawn up procurement plan, another power control device controls charging and discharging of the power storage device in the predetermined area in units of a predetermined period. Based on the error between the obtained procurement plan and the actual value of power demand in the predetermined area, it is determined whether or not to perform imbalance adjustment to adjust the power demand in the predetermined area during the predetermined period. In the control step, when it is determined that the imbalance adjustment is to be performed, charging and discharging of the power storage device is controlled. The power control device and the other power control device are each assigned a charge/discharge amount that can be charged/discharged to the power storage device in units of the predetermined period. The other power control device determines whether to perform a peak cut or peak shift of power demand in a predetermined area within the allocated chargeable/dischargeable amount, and issues a control instruction based on the determination to the power Send to control device . In the control step, when performing the imbalance adjustment, the amount of charging and discharging allocated to the power control device during the predetermined period is combined with the amount of charging and discharging allocated to the other power control device during the predetermined period. The amount of charge and discharge of the power storage device is controlled within the range of the amount of charge and discharge.

Further, the program according to one embodiment causes a computer to execute a determination process and a control process. In the determination process, a power procurement plan is drawn up in a predetermined area, and according to the drawn up procurement plan, another power control device controls charging and discharging of power storage devices in the predetermined area in units of a predetermined period. Based on the error between the obtained procurement plan and the actual value of power demand in the predetermined area, it is determined whether or not to perform imbalance adjustment to adjust the power demand in the predetermined area during the predetermined period. In the control process, when it is determined that the imbalance adjustment is to be performed, charging and discharging of the power storage device is controlled. The power control device and the other power control device are each assigned a charge/discharge amount that can be charged/discharged to the power storage device in units of the predetermined period. The other power control device determines whether to perform a peak cut or peak shift of power demand in a predetermined area within the allocated chargeable/dischargeable amount, and issues a control instruction based on the determination to the power Send to control device . In the control process, when performing the imbalance adjustment, the amount of charging and discharging allocated to the power control device during the predetermined period is combined with the amount of charging and discharging allocated to the other power control device during the predetermined period. The amount of charge and discharge of the power storage device is controlled within the range of the amount of charge and discharge.

According to one embodiment, it is possible to provide a power control system, a power control device, a power control method, and a program that can improve the achievement rate of a power procurement plan in a predetermined area.

1 is a diagram showing a configuration example of a power control system according to an embodiment of the present invention. 2 is a diagram for explaining a procurement plan drawn up by the first power control device shown in FIG. 1. FIG. FIG. 3 is a diagram for explaining changes in a procurement plan, demand forecast, power generation forecast, charging plan, and discharge plan. FIG. 2 is a diagram showing a configuration example of a first power control device shown in FIG. 1. FIG. FIG. 2 is a diagram showing a configuration example of a second power control device shown in FIG. 1. FIG. FIG. 2 is a diagram for explaining a method of determining whether imbalance adjustment is necessary by the second power control device shown in FIG. 1; FIG. 2 is a diagram for explaining a method of determining whether imbalance adjustment is necessary by the second power control device shown in FIG. 1; FIG. 2 is a diagram for explaining conventional imbalance adjustment. FIG. 3 is a diagram for explaining charge/discharge control by the first power control device. FIG. 2 is a diagram for explaining charge/discharge control using conventional imbalance adjustment. 2 is a diagram for explaining imbalance adjustment by the second power control device shown in FIG. 1. FIG. 2 is a sequence diagram showing an example of the operation of the power control system shown in FIG. 1. FIG. 2 is a sequence diagram showing another example of the operation of the power control system shown in FIG. 1. FIG.

Hereinafter, a power control system, a power control device, a power control method, and a program according to one embodiment will be described with reference to the drawings.

FIG. 1 is a diagram showing a configuration example of a power control system 1 according to an embodiment. The power control system 1 according to the present embodiment may configure, for example, an AEMS (Area Energy Management System) that controls power in a predetermined area such as a municipal unit.

As shown in FIG. 1, the power control system 1 according to the present embodiment includes a first power control device 10, a second power control device 20, and a device 30. The first power control device 10 is connected to the second power control device 20. The second power control device 20 is connected to the device 30 via a gateway (GW) 40. The device 30 is provided within a predetermined area where the power control system 1 controls power. Device 30 includes, for example, a solar cell 31, a power meter 32, and a power storage device 33. Although FIG. 1 shows an example in which the second power control device 20 and the device 30 are connected via the GW 40, the present invention is not limited to this. The second power control device 20 and the device 30 may be connected without going through the GW 40.

The first power control device 10 is a power control device that creates a power procurement plan for a predetermined area and controls the power in the predetermined area according to the created procurement plan.

FIG. 2 is a diagram for explaining the procurement plan.

As shown in FIG. 2, the first power control device 10 is configured to control power consumption in a predetermined area in accordance with a power demand forecast and a power generation forecast in a predetermined area in units of a predetermined period (hereinafter referred to as "demand section"). Develop a power procurement plan. Specifically, the first power control device 10 subtracts the power generation forecast from the demand forecast, adds or subtracts values according to the charging plan and the discharging plan, and creates a procurement plan. The demand period is, for example, 30 minutes. The charging plan and the discharging plan are, for example, plans for charging and discharging the power storage device 33 in order to perform peak cutting or peak shifting of power in a predetermined area. In the power control system 1, the actual value of power demand in a predetermined area is required to match the procurement plan for each demand section, that is, the procurement plan is required to be achieved.

The first power control device 10 creates a procurement plan for a predetermined period of time (for example, 48 hours). However, each of the procurement plan, demand forecast, and power generation forecast can be changed up to a predetermined time before the target demand section. For example, the procurement plan can be changed up to one hour before the target demand section. Therefore, if the target demand section is 13:00-13:29, the procurement plan can be changed up to 11:59, as shown in FIG. Further, the demand forecast and the power generation forecast can be changed up to 30 minutes before the target demand section. Therefore, if the target demand section is 13:00-13:29, the demand forecast and power generation forecast can be changed until 12:29, as shown in FIG. The charging plan and the discharging plan can be changed even within the target demand section. After the procurement plan, demand forecast, and power generation forecast cannot be changed, the procurement plan can be achieved by adjusting the charging plan and the discharge plan.

The first power control device 10 may submit the drafted procurement plan to an organization for cross-regional coordination of transmission operators (OCCTO). The first power control device 10 controls charging and discharging of the power storage device 33 for each demand section according to the drafted procurement plan. That is, the first power control device 10 controls charging and discharging of the power storage device 33 in units of a predetermined period (demand section) according to a procurement plan according to a power demand forecast and a power generation forecast. Although details will be described later, in the first power control device 10, a charge/discharge amount that can be charged/discharged to the power storage device 33 is assigned for each demand section. The first power control device 10 controls charging and discharging of the power storage device 33 on a demand interval basis within the range of charging and discharging amount allocated to that demand interval. Further, the first power control device 10 may control charging and discharging of the power storage device 33 in order to perform peak cutting or peak shifting of power demand in a predetermined area. The first power control device 10 transmits a control instruction for controlling charging and discharging of the power storage device 33 to the second power control device 20. According to this control instruction, charging and discharging of power storage device 33 is controlled. Further, the first power control device 10 transmits the procurement plan, demand forecast, and power generation forecast to the second power control device 20.

FIG. 4 is a diagram showing a configuration example of the first power control device 10. As shown in FIG.

As shown in FIG. 4, the first power control device 10 includes a storage section 11, a communication section 12, and a control section 13.

The storage unit 11 is a memory that stores various information necessary for the operation of the first power control device 10. The storage unit 11 may store various data such as calculation results by the control unit 13. The storage unit 11 can be configured by, for example, a semiconductor memory or a magnetic disk, but is not limited to these, and can be configured by any storage device. The storage unit 11 may be a storage medium such as a memory card inserted into the first power control device 10. The storage unit 11 may be an internal memory of a CPU (Central Processing Unit) used as the control unit 13 described later.

The communication unit 12 is a communication interface having various communication functions including wireless communication. The communication unit 12 realizes communication using various communication methods such as LTE (Long Term Evolution). The communication unit 12 may include, for example, a modem whose communication method is standardized by the International Telecommunication Union Telecommunication Standardization Sector (ITU-T). The communication unit 12 may realize wireless communication using various methods such as WiFi (Wireless Fidelity) or Bluetooth (registered trademark). Various types of information transmitted and received by the communication unit 12 may be stored in the storage unit 11. The communication unit 12 may include an antenna for transmitting and receiving radio waves, a suitable RF (Radio Frequency) unit, and the like. Since the communication unit 12 can be configured using a known technique for performing wireless communication, a more detailed description of the hardware will be omitted.

The communication unit 12 may transmit the procurement plan, demand forecast, and power generation forecast to the second power control device 20 under the control of the control unit 13 . The communication unit 12 may transmit control instructions for controlling charging and discharging of the power storage device 33 to the second power control device 20 under the control of the control unit 13 . The communication unit 12 may receive performance data indicating the actual value of power demand by the device 30 from the second power control device 20 and output it to the control unit 13 .

The control unit 13 is a controller that controls the operation of the first power control device 10 as a whole. Control unit 13 may include at least one processor, such as a CPU, to provide control and processing power to perform various functions. The control unit 13 may be implemented by one processor or by multiple processors. Control unit 13 may be realized as a single integrated circuit. A processor may be implemented as a plurality of communicatively connected integrated and discrete circuits. The control unit 13 may be configured as a CPU and a program executed by the CPU. The programs executed by the control unit 13 and the results of the processes executed by the control unit 13 may be stored in the storage unit 11.

The control unit 13 formulates a power procurement plan according to the power demand forecast and power generation forecast in a predetermined area. The control unit 13 controls charging and discharging of the power storage device 33 in accordance with the procurement plan, for each demand interval, within the range of the charge and discharge amount allocated to the first power control device 10 for that demand interval. The control unit 13 may cause the communication unit 12 to transmit the procurement plan, demand forecast, and power generation forecast to the second power control device 20. The control unit 13 may cause the communication unit 12 to transmit a control instruction for controlling charging and discharging of the power storage device 33 to the second power control device 20.

Referring again to FIG. 1, the second power control device 20 is configured to have an integrated power control system that adjusts the power demand in a predetermined area so as to reduce the inconsistency (imbalance) between the actual power demand in the predetermined area and the procurement plan. This is a power control device that performs balance adjustment. The second power control device 20 may receive the control instruction for the power storage device 33 transmitted from the first power control device 10 and transfer it to the power storage device 33 via the GW 40 . The second power control device 20 receives the procurement plan, demand forecast, and power generation forecast transmitted from the first power control device 10, which is another power control device. The second power control device 20 receives the actual value (actual data) of the power demand in the device 30, which is transmitted from the device 30 via the GW 40 at predetermined time intervals (for example, one minute). The second power control device 20 may collect performance data acquired from each device 30 for a predetermined period of time (for example, 30 minutes) and transmit it to the first power control device 10.

If the second power control device 20 determines that the procurement plan cannot be achieved without controlling the charging and discharging of the power storage device 33, it performs imbalance adjustment. Specifically, the second power control device 20 determines whether to perform imbalance adjustment based on the error between the procurement plan according to the demand forecast and power generation forecast and the actual value of the power demand in a predetermined area. do. When the second power control device 20 determines to perform the imbalance adjustment, the second power control device 20 controls charging and discharging of the power storage device 33 in units of a predetermined period (for example, one minute) that is shorter than the first power control device 10 . Here, although the details will be described later, the second power control device 20 allocates a charge/discharge amount that can be charged/discharged to the power storage device 33 by imbalance adjustment for each demand section.

FIG. 5 is a diagram showing a configuration example of the second power control device 20. As shown in FIG.

The second power control device 20 shown in FIG. 5 includes a storage section 21, communication sections 22 and 23, and a control section 24.

The storage unit 21 is a memory that stores various information necessary for the operation of the second power control device 20. The storage unit 21 may store a program according to an embodiment. The storage unit 21 may store various data such as calculation results by the control unit 24. The storage unit 21 can be configured by, for example, a semiconductor memory or a magnetic disk, but is not limited to these, and can be configured by any storage device. The storage unit 21 may be a storage medium such as a memory card inserted into the second power control device 20. The storage unit 21 may be an internal memory of a CPU used as a control unit 24, which will be described later.

The communication unit 22 is a communication interface having a communication function using a communication method corresponding to the communication method of the communication unit 12.

The communication unit 22 may receive a control instruction transmitted from the first power control device 10, which is another power control device, and output it to the control unit 24. The communication unit 22 receives the procurement plan, demand forecast, and power generation forecast from the first power control device 10 and outputs it to the control unit 24 . Under the control of the control unit 24, the communication unit 22 may compile performance data of the power demand of the devices 30 for a predetermined period of time (for example, 30 minutes) and transmit it to the first power control device 10.

The communication unit 23 is a communication interface having various communication functions including wireless communication. The communication unit 23 realizes communication using various communication methods such as LTE, for example. The communication unit 23 may include, for example, a modem whose communication method is standardized by ITU-T. The communication unit 23 may implement wireless communication using various methods such as WiFi or Bluetooth (registered trademark). Various types of information transmitted and received by the communication unit 23 may be stored in the storage unit 21. The communication unit 23 may include an antenna for transmitting and receiving radio waves, a suitable RF unit, and the like. Since the communication unit 23 can be configured using a known technique for performing wireless communication, a more detailed description of the hardware will be omitted.

The communication unit 23 may receive power demand performance data transmitted from the device 30 via the GW 40 and output it to the control unit 24 . The communication unit 23 may transmit control instructions for controlling charging and discharging of the power storage device 33 to the power storage device 33 under the control of the control unit 24 .

The control unit 24 is a controller that controls the operation of the second power control device 20 as a whole. Control unit 24 may include at least one processor, such as a CPU, to provide control and processing power to perform various functions. The control unit 24 may be implemented by one processor or by multiple processors. Control unit 24 may be implemented as a single integrated circuit. A processor may be implemented as a plurality of communicatively connected integrated and discrete circuits. The control unit 24 may be configured as a CPU and a program executed by the CPU. The program executed by the control unit 24 and the results of the processing executed by the control unit 24 may be stored in the storage unit 21.

When the communication unit 22 outputs a control instruction to the power storage device 33, the control unit 24 may cause the communication unit 23 to transmit the control instruction to the power storage device 33 via the GW 40. When the communication unit 23 outputs the performance data of the power demand in the device 30, the control unit 24 may compile the performance data for a predetermined period of time and cause the communication unit 22 to transmit the data to the first power control device 10.

The control unit 24 determines whether to perform imbalance adjustment based on the procurement plan and the actual power demand data. Specifically, the control unit 24 determines whether to perform imbalance adjustment based on the error between the procurement plan and the actual power demand data (actual value). When determining that the imbalance adjustment is to be performed, the control unit 24 controls charging and discharging of the power storage device 33 in units of a predetermined period (for example, one minute) that is shorter than that of the first power control device 10 . Specifically, the control unit 24 causes the communication unit 23 to transmit a control instruction for controlling charging and discharging of the power storage device 33 to the power storage device 33.

Referring to FIG. 1 again, the device 30 is connected to the second power control device 20 via the GW 40. The device 30 transmits actual power demand data in the device 30 to the second power control device 20 via the GW 40 at predetermined time intervals (for example, one minute). As described above, device 30 includes, for example, solar cell 31, power meter 32, and power storage device 33.

The solar cell 31 converts sunlight energy into DC power. The solar cell 31 is configured such that, for example, power generation units having photoelectric conversion cells are connected in a matrix and output a predetermined direct current. The type of solar cell 31 is not limited as long as it can be photoelectrically converted, such as a silicon-based polycrystalline solar cell, a silicon-based single-crystalline solar cell, or a thin film solar cell such as CIGS.

Power meter 32 measures the amount of power consumed or supplied by the load.

The power storage device 33 includes a storage battery such as a lithium ion battery or a nickel metal hydride battery. The power storage device 33 can supply power by discharging the charged power. Further, the power storage device 33 can be charged with power supplied from the power system, the solar battery 31, or the like. The power storage device 33 can be charged and discharged according to control instructions transmitted from the second power control device 20.

Next, the determination of whether imbalance adjustment is necessary by the second power control device 20 will be described in more detail with reference to FIGS. 6A and 6B. FIG. 6A shows a case where the actual value is subtracted from the procurement plan to determine the error between the procurement plan and the actual value. FIG. 6B shows a case where the procurement plan is subtracted from the actual value to find the error between the procurement plan and the actual value. In FIGS. 6A and 6B, the vertical axis indicates the ratio of error between the procurement plan and the actual value (error rate), and the horizontal axis indicates the elapsed time from the start of the target demand section.

As shown in FIG. 6A, when the error rate exceeds a predetermined charging threshold, that is, when the error rate reaches a charging required area larger than the charging threshold, the second power control device 20 controls the power storage device 33 by imbalance adjustment. It is determined that charging is necessary. Furthermore, when the error rate falls below a predetermined discharge threshold, that is, when the error rate reaches a discharge required area smaller than the discharge threshold, the second power control device 20 determines that the power storage device 33 needs to be discharged by imbalance adjustment. It is determined that there is.

Further, as shown in FIG. 6B, when the error rate exceeds a predetermined discharge threshold, that is, when the error rate reaches a discharge required area larger than the discharge threshold, the second power control device 20 performs power storage by imbalance adjustment. It is determined that the device 33 needs to be discharged. Furthermore, when the error rate exceeds a predetermined charging threshold, that is, when the error rate reaches a charging required area smaller than the charging threshold, the second power control device 20 determines that the power storage device 33 needs to be charged by imbalance adjustment. It is determined that there is.

The second power control device 20 compares the error rate with the charging threshold and the discharging threshold at predetermined time intervals (for example, every minute). As a result of the comparison, the second power control device 20 determines that imbalance adjustment is necessary when the error rate reaches the charging required area or the discharging required area.

FIG. 7 is a diagram for explaining conventional imbalance adjustment.

For the power storage device 33, the amount of charge that can be charged per day (permissible daily charge amount) and the amount of discharge that can be discharged per day (permissible daily discharge amount) are determined. The first power control device 10 allocates a predetermined charging amount of the daily allowable charging amount of the power storage device 33 as a controllable charging amount (charging control amount) in one day. Furthermore, the first power control device 10 allocates a predetermined discharge amount of the daily allowable discharge amount of the power storage device 33 as a controllable discharge amount per day (discharge control amount). As shown in FIG. 8, the first power control device 10 controls charging of the power storage device 33 according to the procurement plan within the range of the allocated charge control amount and discharge control amount for each demand section.

Charging of the power storage device 33 by conventional imbalance adjustment is controlled within the range of the adjustment daily charge amount obtained by subtracting the charge control amount from the daily allowable charge amount. Further, the discharge from the power storage device 33 due to the conventional imbalance is controlled within the range of the adjustment daily discharge amount obtained by subtracting the discharge control amount from the daily allowable discharge amount.

Figure 9 shows the amount of charge that can be used for imbalance adjustment (usable charge amount) and the amount of discharge that can be used for imbalance adjustment (usable discharge amount) for each demand section in conventional imbalance adjustment. FIG. As shown in FIG. 9, in conventional imbalance adjustment, a usable charge amount and a usable discharge amount are allocated to each demand section. The usable charge amount in the last demand section of the day is less than or equal to the adjustment daily charge amount. Further, the usable discharge amount in the last demand section of the day is less than the adjustment daily discharge amount. That is, in the conventional imbalance adjustment, charging of the power storage device 33 is controlled by imbalance adjustment within the range of the usable charge amount allocated to each demand section, which does not exceed the daily charge amount for adjustment. Furthermore, in the conventional imbalance adjustment, charging of the power storage device 33 is controlled by imbalance adjustment within the range of the usable discharge amount allocated to each demand section, which does not exceed the daily discharge amount for adjustment.

Therefore, in the conventional imbalance adjustment, the power storage device 33 can be charged only within the range of the adjustment daily charge amount obtained by subtracting the charge control amount by the first power control device 10 from the daily allowable charge amount. Specifically, in conventional imbalance adjustment, as shown in FIG. 7, the amount of charge obtained by subtracting the actual value of the storage battery charge amount from the amount of available charge in the target demand section for which imbalance adjustment is performed is calculated as the amount of charge in the target demand section. becomes the amount of charge that can be used for imbalance adjustment (the amount of charge for the target demand section). Here, the actual value of the storage battery charge amount is the total value of the charge amount by imbalance adjustment up to the demand section immediately before the target demand section.

Further, in the conventional imbalance adjustment, the power storage device 33 can be discharged only within the adjustment daily discharge amount obtained by subtracting the discharge control amount by the first power control device 10 from the daily allowable discharge amount. Specifically, in conventional imbalance adjustment, as shown in Figure 7, the discharge amount obtained by subtracting the actual value of the storage battery discharge amount from the usable discharge amount in the target demand section is used for imbalance adjustment in the target demand section. This is the usable discharge amount (discharge amount for the target demand section). Here, the actual value of the storage battery discharge amount is the total value of the discharge amount due to imbalance adjustment up to the demand section immediately before the target demand section.

In this manner, in the conventional imbalance adjustment, charging and discharging of the power storage device 33 can only be controlled within the range of the daily adjustment charge amount and the adjustment daily discharge amount. Therefore, depending on the error between the procurement plan and actual demand, the procurement plan may not be achieved. Furthermore, when imbalance adjustment is performed, charging and discharging of power storage device 33 by first power control device 10 is not performed. Therefore, in the conventional imbalance adjustment, it was not possible to effectively utilize the charge control amount and the discharge control amount assigned to the first power control device 10. That is, as described above, the error rate is compared with the charging threshold value and the discharging threshold value at predetermined time intervals (for example, every minute), and it is determined whether imbalance adjustment is necessary. Here, in conventional imbalance adjustment, when it is determined that imbalance adjustment is necessary, charging and discharging of the power storage device 33 can be controlled only within the range of the daily charge amount for adjustment and the daily discharge amount for adjustment. could not. Therefore, the charging control amount and the discharging control amount assigned to the first power control device 10 remained unused for imbalance adjustment.

Therefore, in the present embodiment, the second power control device 20 sets the charge/discharge amount allocated to the second power control device 20 in the target demand section for which imbalance adjustment is to be performed, and the charge/discharge amount assigned to the second power control device 10 in the target demand section. The charging and discharging of the power storage device 33 is controlled within the range of the charging and discharging amount that is the sum of the charging and discharging amount assigned to .

More specifically, as shown in FIG. 10, the second power control device 20 subtracts the actual value of the storage battery charge amount from the usable charge amount allocated to the second power control device 20 in the target demand section, The charging amount obtained by adding the charging control amount assigned to the first power control device 10 to the target demand section is set as the charging amount for the target demand section. Further, the second power control device 20 subtracts the actual value of the storage battery discharge amount from the usable discharge amount allocated to the second power control device 20 in the target demand section, and the The amount of charge added to the allocated discharge control amount is set as the amount of charge for the target demand section.

As described above, in the present embodiment, the second power control device 20 uses the charge/discharge amount assigned to the second power control device 20 in the target demand section for which imbalance adjustment is to be performed, and the first power control device in the target demand section. The charging and discharging of the power storage device 33 is controlled within the range of the charging and discharging amount including the charging and discharging amount assigned to No. 10. Therefore, compared to conventional imbalance adjustment, imbalance adjustment can be performed over a larger range of charging and discharging amounts, so it is possible to improve the achievement rate of the procurement plan.

For example, assume that the charge/discharge control amount of the first power control device 10 in a predetermined demand section is 100 kW, and the charge/discharge amount allocated to imbalance adjustment of the second power control device 20 is 30 kW. In the demand section, the second power control device 20 can only control charging and discharging of the power storage device 33 within a range of 30 kW using conventional imbalance adjustment. On the other hand, in the present embodiment, the second power control device 20 can control charging and discharging of the power storage device 33 within a range of 130 kW, which is the 100 kW that can be used by the first power control device 10. Therefore, the imbalance can be adjusted more flexibly, and the achievement rate of the procurement plan can be improved.

FIG. 11 is a flowchart showing an example of the operation of the power control system 1, and is a diagram for explaining the power control method in the second power control device 20. Although FIG. 11 shows the power meter 32 and the power storage device 33 as the device 30, the device 30 may include the solar cell 31 and the like, as described above.

The first power control device 10 transmits a control instruction to control charging and discharging of the power storage device 33 according to the procurement plan to the second power control device 20 (step S101).

Upon receiving the control instruction from the first power control device 10, the second power control device 20 transfers the received control instruction to the power storage device 33 (step S102).

Upon receiving the control instruction from the second power control device 20, the power storage device 33 transmits a reception response to the control instruction to the second power control device 20 (step S103).

Upon receiving the reception response to the control instruction from the power storage device 33, the second power control device 20 transfers the reception response to the first power control device 10 (step S104).

The power meter 32 and the power storage device 33 each transmit power demand performance data to the second power control device 20 at predetermined time intervals (for example, 1 minute) (steps S105, S106).

The second power control device 20 performs imbalance adjustment at predetermined time intervals (for example, every minute) based on the error between the procurement plan and the actual power demand value indicated in the actual data received from each device 30. It is determined whether or not it is necessary (step S107).

When determining that imbalance adjustment is necessary, second power control device 20 transmits a control instruction to control charging and discharging of power storage device 33 to power storage device 33 (step S108). Here, the second power control device 20 determines the charge/discharge amount allocated to the second power control device 20 in the target demand section for performing imbalance adjustment, and the charge/discharge amount allocated to the first power control device 10 in the target demand section. The charging and discharging of the power storage device 33 is controlled within the range of the charging and discharging amount including the discharging amount.

Upon receiving the control instruction from the second power control device 20, the power storage device 33 transmits a reception response to the control instruction to the second power control device 20 (step S109). Thereby, charging and discharging of the power storage device 33 is switched from control by the first power control device 10 to control by the second power control device 20.

As described above, the power control method in the second power control device 20 according to the present embodiment is based on the error between the procurement plan drawn up by the first power control device 10 and the actual value of power demand in a predetermined area. It includes a determination step (step S107) of determining whether or not to perform imbalance adjustment. Further, the power control method according to the present embodiment includes a control step (step S108) of controlling charging and discharging of the power storage device 33 when it is determined that imbalance adjustment is to be performed. In the control step, when performing imbalance adjustment, the charge and discharge amount that is the sum of the charge and discharge amount allocated to the second power control device 20 for a predetermined period and the charge and discharge amount allocated to the first power control device 10 for a predetermined period is determined. The amount of charge and discharge of the power storage device 33 is controlled within the range of the amount of discharge.

In the power control system 1 as shown in FIG. 1, as described above, it is required to achieve the procurement plan without causing an imbalance. On the other hand, in the power control system 1 as shown in FIG. 1, a power rate is imposed according to the peak of power demand in a predetermined area. Therefore, it is necessary to cut or shift peak power demand in order to prevent increases in power rates. If we try to solve these problems using individual measures, the measures for each problem may conflict with each other. Below, the operation of the power control system 1 for preventing an increase in the cost of power charges and occurrence of shift imbalance due to peak power demand will be described with reference to the sequence diagram shown in FIG. 12.

The first power control device 10 creates a procurement plan according to the demand forecast and the power generation forecast (step S201).

The first power control device 10 determines whether a peak of a predetermined value or more occurs in power demand based on the procurement plan (step S202).

If it is determined that a peak occurs in the power demand (step S202: Yes), the first power control device 10 determines that a peak cut is necessary, and controls charging and discharging of the power storage device 33 in order to perform the peak cut. A peak cut operation instruction is formulated (step S203).

If it is determined that a peak does not occur in the power demand (step S202: No), and after formulating a peak cut operation instruction, the first power control device 10 determines whether the power purchase fee is higher than a predetermined value. Determination is made (step S204).

If it is determined that the electricity purchase fee is high (step S204: Yes), the first power control device 10 determines that a peak shift is necessary, and controls charging and discharging of the power storage device 33 in order to perform the peak shift. A peak shift operation instruction is formulated (step S205).

If it is determined that the power rate is not higher than the predetermined value (step S204: No), and after formulating the peak shift operation instruction, the first power control device 10 determines whether both peak cut and peak shift are necessary. It is determined whether or not (step S206).

If it is determined that both a peak cut and a peak shift are necessary (step S206: Yes), the first power control device 10 determines the economic effect of implementing the peak cut operation instruction and the implementation of the peak shift operation instruction. Estimate the economic effects of doing so. The first power control device 10 determines to implement the operation instruction that is economically effective (step S207).

If it is determined that at least one of the peak cut and the peak shift is not necessary (step S206: No), the first power control device 10 determines to implement the planned operation instruction.

The first power control device 10 transmits a control instruction corresponding to the operation instruction determined to be executed to the second power control device 20 (step S208). This control instruction is for controlling charging and discharging of power storage device 33 in order to perform peak cutting or peak shifting. Further, the first power control device 10 transmits the procurement plan, demand forecast, power generation forecast, and prediction error information to the second power control device 20.

Upon receiving the control instruction from the first power control device 10, the second power control device 20 transfers the received control instruction to the power storage device 33 (step S209). Thereby, charging and discharging of power storage device 33 is controlled according to the control instruction, and peak cutting or peak shifting is performed.

The power meter 32 and the power storage device 33 each transmit power demand performance data to the second power control device 20 at predetermined time intervals (for example, 1 minute) (steps S210, S211).

The second power control device 20 determines whether imbalance adjustment is necessary based on the procurement plan and the performance data received from each device 30 (step S212).

When determining that imbalance adjustment is necessary, second power control device 20 transmits a control instruction to control charging and discharging of power storage device 33 to power storage device 33 (step S213). This control instruction is for controlling charging and discharging of power storage device 33 in order to perform imbalance adjustment.

In FIG. 12, after the first power control device 10 performs charging and discharging control of the power storage device 33 for peak cut or peak shift, the second power control device 20 controls the power storage device 33 for imbalance adjustment. Charge/discharge control is performed. Therefore, it is possible to prevent an increase in power charges and an imbalance due to peak power demand.

As described above, in the present embodiment, the power control system 1 includes the power storage device 33 within a predetermined area, the first power control device 10, and the second power control device 20. The first power control device 10 controls charging and discharging of the power storage device 33 in units of a predetermined period according to a power procurement plan in a predetermined area. The second power control device 20 determines whether or not to perform imbalance adjustment based on the error between the procurement plan and the actual value of power demand in a predetermined area, and if it is determined to perform imbalance adjustment, the power storage Controls charging and discharging of the device 33. The first power control device 10 and the second power control device 20 are each assigned a charge/discharge amount that can be charged/discharged to the power storage device 33 in units of a predetermined period. When performing imbalance adjustment, the second power control device 20 compares the charge and discharge amount allocated to the second power control device 20 in a predetermined period and the charge and discharge amount allocated to the first power control device 10 in a predetermined period. The charging and discharging of the power storage device 33 is controlled within the range of the total amount of charging and discharging.

Therefore, the imbalance can be adjusted within a larger range of charge/discharge amounts, and the achievement rate of the procurement plan can be improved.

Although the embodiments described above have been described as representative examples, it will be apparent to those skilled in the art that many modifications and substitutions can be made within the spirit and scope of this disclosure. Therefore, the present disclosure should not be construed as being limited by the embodiments described above, and various modifications and changes are possible without departing from the scope of the claims. For example, it is possible to combine a plurality of configuration blocks described in the configuration diagram of the embodiment into one, or to divide one configuration block.

The embodiments described above are not limited to implementation as the power control system 1, the first power control device 10, and the second power control device 20. For example, the embodiment described above may be implemented as a power control method in a power control device such as the second power control device 20. Further, the embodiments described above may be implemented as a program executed on a computer such as the second power control device 20.

The Sustainable Development Goals (SDGs) are among the 17 international goals adopted at the United Nations Summit in September 2015. The power control system 1 according to one embodiment is designed to meet the goals of 17 goals of the SDGs, such as "7. Affordable and clean energy," "9. Create a foundation for industry and technological innovation," and "11. It can contribute to achieving goals such as ``creating cities where people can continue to live''.

1 Power control system 10 First power control device (other power control device)
11 Storage unit 12 Communication unit 13 Control unit 20 Second power control device (power control device)
21 Storage unit 22 Communication unit 23 Communication unit 24 Control unit 30 Equipment 31 Solar cell 32 Power meter 33 Power storage device 40 Gateway

Claims (6)

A power storage device within a predetermined area,
a first power control device that controls charging and discharging of the power storage device in units of a predetermined period according to a power procurement plan in the predetermined area;
Based on the error between the procurement plan and the actual value of power demand in the predetermined area, it is determined whether or not to perform an imbalance adjustment to adjust the power demand in the predetermined area in the predetermined period, and the imbalance is adjusted. a second power control device that controls charging and discharging of the power storage device when it is determined that the adjustment is to be performed;
The first power control device and the second power control device are each assigned a charge/discharge amount that can be charged/discharged to the power storage device in units of the predetermined period,
The first power control device determines whether or not to perform a peak cut or peak shift of power demand in a predetermined area within the allocated chargeable/dischargeable amount, and issues a control instruction based on the determination to the first power control device. 2 to the power control device;
When performing the imbalance adjustment, the second power control device compares the amount of charging and discharging allocated to the second power control device during the predetermined period and the amount of charging and discharging allocated to the first power control device during the predetermined period. A power control system that controls charging and discharging of the power storage device within a range of a charge and discharge amount including a discharge amount. The second power control device receives the control instruction based on the power procurement plan including peak shift and peak cut for the power storage device transmitted from the first power control device, and performs imbalance adjustment in accordance with the control instruction. The power control system according to claim 1, wherein the power control system transmits a control instruction to perform the following to the power storage device. The second power control device follows the control instruction transmitted from the first power control device based on the power procurement plan including peak shift/peak cut to the power storage device and the control instruction to perform the imbalance adjustment, The power control system according to claim 1 , which controls charging and discharging of a power storage device. A power control device,
A procurement plan drawn up by another power control device that draws up a power procurement plan in a predetermined area, and controls charging and discharging of power storage devices in the predetermined area in accordance with the drawn up procurement plan in units of a predetermined period. and the actual value of power demand in the predetermined area, determine whether or not to perform an imbalance adjustment to adjust the power demand in the predetermined area in the predetermined period, and perform the imbalance adjustment. If it is determined that the power storage device is
The power control device and the other power control device are each assigned a charge/discharge amount that can be charged/discharged to the power storage device in units of the predetermined period,
The other power control device determines whether to perform a peak cut or peak shift of power demand in a predetermined area within the allocated chargeable/dischargeable amount, and issues a control instruction based on the determination to the power send to the control device ,
When performing the imbalance adjustment, the control unit combines the charge and discharge amount allocated to the power control device during the predetermined period with the charge and discharge amount allocated to the other power control device during the predetermined period. A power control device that controls a charge/discharge amount of the power storage device within a range of a charge/discharge amount. A power control method in a power control device, comprising:
A procurement plan drawn up by another power control device that draws up a power procurement plan in a predetermined area, and controls charging and discharging of power storage devices in the predetermined area in accordance with the drawn up procurement plan in units of a predetermined period. and a determination step of determining whether or not to perform an imbalance adjustment to adjust the power demand in the predetermined area in the predetermined period based on the error between the power demand and the actual value of the power demand in the predetermined area;
If it is determined that the imbalance adjustment is to be performed, a control step of controlling charging and discharging of the power storage device,
The power control device and the other power control device are each assigned a charge/discharge amount that can be charged/discharged to the power storage device in units of the predetermined period,
The other power control device determines whether to perform a peak cut or peak shift of power demand in a predetermined area within the allocated chargeable/dischargeable amount, and issues a control instruction based on the determination to the power send to the control device ,
In the control step, when performing the imbalance adjustment, the amount of charging and discharging allocated to the power control device during the predetermined period is combined with the amount of charging and discharging allocated to the other power control device during the predetermined period. A power control method for controlling the amount of charging and discharging of the power storage device within a range of the amount of charging and discharging. In the power control device computer,
A procurement plan drawn up by another power control device that draws up a power procurement plan in a predetermined area, and controls charging and discharging of power storage devices in the predetermined area in accordance with the drawn up procurement plan in units of a predetermined period. and a determination process of determining whether to perform an imbalance adjustment to adjust the power demand in the predetermined area in the predetermined period based on the error between the actual value of the power demand in the predetermined area and the power demand in the predetermined area.
If it is determined that the imbalance adjustment is to be performed, a control process for controlling charging and discharging of the power storage device is executed;
The power control device and the other power control device are each assigned a charge/discharge amount that can be charged/discharged to the power storage device in units of the predetermined period,
The other power control device determines whether to perform a peak cut or peak shift of power demand in a predetermined area within the allocated chargeable/dischargeable amount, and issues a control instruction based on the determination to the power send to the control device ,
In the control process, when performing the imbalance adjustment, the amount of charging and discharging allocated to the power control device during the predetermined period is combined with the amount of charging and discharging allocated to the other power control device during the predetermined period. A program that controls the amount of charging and discharging of the power storage device within the range of the amount of charging and discharging.

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