JP7540928B2 - Power management device, power management system, and power management method - Google Patents

Description

This disclosure relates to a power management device, a power management system, and a power management method.

In recent years, a technology has been known in which a power management device installed at each consumer controls the loads and distributed power sources installed at the consumer in response to disaster information. For example, Patent Document 1 describes obtaining warning information and changing the amount of power stored in the storage battery depending on the application.

JP 2014-220975 A

In areas where an alert has been issued, consumers equipped with energy storage devices may consider increasing the amount of charge in preparation for a power outage. Meanwhile, power management devices perform imbalance control to adjust the amount of power demand and supply during normal times in order to stabilize the grid. As a result, under imbalance control, it is difficult to ensure a sufficient amount of charge in preparation for a sudden disaster, and there is room for improvement in the control of energy storage devices when disaster information is acquired.

The power management device according to a first aspect is a power management device that controls the charging and discharging of the storage battery so that an imbalance, which is the difference between a planned value for power purchase from a grid and an actual value for power purchase within a predetermined time period, falls within a target range value, and has a control unit that controls the operating state of the storage battery, and a communication unit that can acquire disaster information and the amount of stored power in the storage battery. In a normal mode, the control unit controls the operating state of the storage battery so that the target range value becomes a normal reference value, and sets the target range value based on the disaster information and the amount of stored power.

The power management system according to the second aspect includes a storage battery, and a power management device that controls charging and discharging of the storage battery so that an imbalance, which is the difference between a planned value for power purchase from a grid and an actual value for power purchase within a predetermined time period, falls within a target range value. The power management device has a control unit that controls the operating state of the storage battery, and a communication unit that can acquire disaster information and the amount of stored power in the storage battery. The control unit controls the operating state of the storage battery in a normal mode so that the target range value becomes a normal reference value, and sets the target range value based on the disaster information and the amount of stored power.

The power management method according to the third aspect controls charging and discharging of the storage battery so that an imbalance, which is the difference between a planned value for power purchase from the grid and an actual value for power purchase within a predetermined time period, falls within a target range value. The power management method includes the steps of controlling the operating state of the storage battery in a normal mode so that the target range value within a predetermined time period becomes a normal reference value, acquiring disaster information and the amount of stored power in the storage battery, and setting the target range value based on the disaster information and the amount of stored power.

According to the power management device, power management system, and power management method of the embodiments of the present invention, the storage battery can be charged according to the target range value of the imbalance and the amount of electricity stored in the storage battery, making it possible to ensure a charging amount in preparation for a disaster while taking into account the stabilization of the system.

1 is a diagram illustrating a configuration of a power management system according to an embodiment. FIG. 4 is a diagram illustrating an example of the operation of a power management device according to an embodiment. FIG. 4 is a diagram illustrating an example of the operation of a power management device according to an embodiment.

The following describes a power management device, a power management system, and a power management method according to one embodiment, with reference to the drawings.

Figure 1 is a diagram showing an example of the configuration of a power management system 1 according to one embodiment.

As shown in FIG. 1, the power management system 1 has a power management device 100 and a storage battery 200. The power management system 1 may also have an external server 20 and a power meter 300. The power management system 1 may also have various other devices. The devices may include, for example, at least one of a distributed power source that outputs power and a load that consumes power. The number of devices may be one or more.

In Figure 1, solid lines indicate power lines and dashed lines indicate communication lines.

The power management device 100 and the storage battery 200 are connected to a network 30. The network 30 includes at least one of a local area network (LAN), a wide area network (WAN), and the Internet.

The power management device 100 constitutes an area energy management system (AEMS) that controls power within a predetermined area. The predetermined area may be, for example, a city, town, or village, or may be a predetermined section, and may include two or more sections that are physically separated from each other.

The power management device 100 may manage or control the power status and operating status of various devices included in the power management system 1.

The storage battery 200 is, for example, a lithium ion battery, a nickel metal hydride battery, a lead storage battery, or the like. The storage battery 200 can supply power to a load by discharging the charged power. The storage battery 200 can also be charged with power supplied from the grid 10, etc.

The storage battery 200 can be charged and discharged according to control instructions sent from the power management device 100.

In this embodiment, the power management device 100 is described as controlling the charging and discharging of the storage battery 200 so that the difference between the planned value for purchasing power from the grid 10 and the actual value for purchasing power within a specified time period is within a target range value.

The external server 20 is connected to the network 30 and can acquire and store disaster information and weather information from at least one of the information sources, such as government agencies and private agencies. The external server 20 can also acquire and store power purchase plans for the area under the jurisdiction of the power management system 1 from the Agency for Cross-regional Transmission Operators.

The power meter 300 acquires an actual power purchase value from the grid 10 in an area under the jurisdiction of the power management system 1. The power meter 300 may also acquire an actual power purchase value for each consumer from the grid 10 in an area under the jurisdiction of the power management system 1. Note that in this embodiment, the power meter 300 is described as a current sensor provided on a power line between the grid 10 and the storage battery 200, but is not limited to the power meter 300 as long as it is a device capable of acquiring an actual power purchase value.

In this embodiment, the power management system 1 is described as having a storage battery 200 as a distributed power source, but is not limited to this. The power management system 1 may be provided with other distributed power sources in addition to the storage battery 200. The distributed power sources may include at least one of a solar cell and a fuel cell. The distributed power sources may be a combination of different types of power sources.

The type of solar cell is not limited as long as it is capable of photoelectric conversion, such as a silicon-based polycrystalline solar cell, a silicon-based single crystal solar cell, or a thin-film solar cell such as CIGS. In one embodiment, the solar cell may be any power source as long as it has the function of generating solar power to supply electricity.

The fuel cell may include, for example, a cell that generates direct current electricity by chemically reacting hydrogen with oxygen in the air, and other auxiliary devices. Examples of the fuel cell include a solid oxide fuel cell (SOFC), a polymer electrolyte fuel cell (PEFC), a phosphoric acid fuel cell (PAFC),
Alternatively, the fuel cell may be configured to include a cell stack of a fuel cell such as a molten carbonate fuel cell (MCFC).

Next, we will explain the power management device 100 according to one embodiment.

As shown in FIG. 1, the power management device 100 has a control unit 110 and a communication unit 120. The power management device 100 may also have a memory unit 130. The power management device 100 may operate using power supplied from the storage battery 200, may operate using other power supply means provided in the power management system 1, or may operate using power supply means outside the jurisdiction of the power management system 1.

The memory unit 130 may store various information used in the information processing executed by the control unit 110. The memory unit 130 may store the types of distributed power sources provided in the area, the types of loads, and the power consumption of the loads. The memory unit 130 includes an auxiliary storage device such as a hard disk drive (HDD) or a solid state drive (SSD). The control unit 110 may store information in the memory unit 130 or update the information stored in the memory unit 130.

The control unit 110 is a processor that controls the entire power management system 1, including each function of the power management device 100. The control unit 110 controls the operating state of the storage battery 200. The operating state may be any state in which the storage battery 200 is controlled according to a predetermined program, such as control of the amount of charge and discharge per hour of the storage battery 200, or may be a state in which the storage battery 200 is directly controlled without being based on a program. The state may be referred to as a mode. The control unit 110 controlling the operating state of the storage battery 200 may mean that the control unit 110 controls the communication unit 120 so that the communication unit 120 transmits a control signal to the storage battery 200 to control the operating state of the storage battery 200.

The communication unit 120 is a communication interface having various communication functions including wireless communication. The communication unit 120 realizes communication by various communication methods such as LTE (Long Term Evolution). The communication unit 120 may also have the functions of the communication unit 120. The communication unit 120 may include, for example, a modem whose communication method is standardized by the International Telecommunication Union Telecommunication Standardization Sector (ITU-T). ...
(registered trademark), the wireless communication may be realized by various methods. The communication unit 120 may be configured to include an antenna for transmitting and receiving radio waves and an appropriate RF (Radio Frequency) unit. The communication unit 120 may be configured by known technology for performing wireless communication, and therefore a detailed description of the hardware will be omitted.

The communication unit 120 communicates with the storage battery 200 via the network 30. The communication unit 120 may also communicate with the external server 20. The communication unit 120 may also acquire the actual power purchase value from the power meter 300 via the network 30 or without via the network 30. The communication unit 120 may also acquire the actual power purchase value from the power meter 300 at a predetermined time interval. The communication unit 120 may also acquire the actual power purchase value as an instantaneous value at a certain time, or may acquire the actual power purchase value as an integrated value within a predetermined time.

The communication unit 120 may also acquire disaster information. In this embodiment, the disaster information is not limited to information indicating that a disaster will definitely occur, but is described as including information indicating that a disaster is likely to occur in the future, for example, within a predetermined time from the current time (hereinafter also referred to as the disaster forecast time). Therefore, the disaster information may include disaster information including information indicating that a disaster is predicted to occur within the disaster forecast time from the current time. The disaster information may also include information indicating that a disaster will not occur at least within the disaster forecast time from the current time. The disaster information may also include information regarding the end of the disaster. Examples of disasters include, but are not limited to, various disasters such as earthquakes, typhoons, heavy rain, and heavy snow. The information regarding the end of the disaster may be information indicating that the disaster has ended, or information indicating that the end of the disaster is predicted.

Note that the disaster forecast time may represent, for example, a time on the order of a few hours or minutes.

The communication unit 120 may also acquire power outage information. The power outage information is information that a power outage has occurred. Note that the power outage information is not limited to information about a power outage in the area under the jurisdiction of the power management system 1, but may also be information about a power outage in an area adjacent to the area under the jurisdiction of the power management system 1.

In this embodiment, the disaster information and the power outage information may be related information that has a causal relationship, or may be different and independent pieces of information. In other words, when the communication unit 120 acquires disaster information, it may acquire related power outage information. Furthermore, even when the communication unit 120 acquires disaster information, it is not necessary to acquire power outage information. For example, this may be the case when a disaster is forecast, but the disaster does not actually occur and there is no power outage. Furthermore, even when the communication unit 120 does not acquire disaster information, it may acquire power outage information. For example, this may be the case when it is difficult to forecast future disasters and disasters may occur suddenly.

The communication unit 120 may also acquire information including at least one of the amount of stored power and the charging speed of the storage battery 200 via the network 30. The value of the amount of stored power may be expressed as SOC (State Of Charge) or SOH (State Of Health). The value of the charging speed may be expressed using C-Rate (Capacity Rate) or the output of the storage battery 200.

The control unit 110 controls the operation state of the storage battery 200 based on the disaster information acquired by the communication unit 120 and the amount of power stored in the storage battery 200. The control of the operation state of the storage battery 200 may include control of the power state. The control of the power state of the storage battery 200 is, for example, control to output (discharge) power and control to charge power.

The control unit 110 may control the difference between the actual power purchase value and the power purchase plan value from the grid 10 within a predetermined time (hereinafter also referred to as imbalance) so that it is within a predetermined imbalance tolerance ratio (hereinafter also referred to as target range value). In other words, the control unit 110 may control the operating state of the storage battery 200 so that the imbalance, which is the difference between the actual power purchase value and the power purchase plan value from the grid 10 within a predetermined time, is within the target range value (hereinafter also referred to as imbalance control). For example, if the actual power purchase value within a predetermined time is 103% of the power purchase plan value, the target range value is +3%. In other words, in this case, the actual power purchase value within a predetermined time is 3% larger than the power purchase plan value. In this way, the target range value may be determined as one value, or may be determined as a value that allows a range, such as +2 to 3%. Also, for example, if the actual power purchase value within a specified time is 97% of the planned power purchase value, the target range value is set to -3%. In other words, in this case, the actual power purchase value within a specified time will be 3% smaller than the planned power purchase value. In this way, the target range value may be determined as a single value, or may be determined as a value that allows for a range, such as -2 to 3%. The target range value may also take a range of positive and negative values, such as ±3%.

The economic impact of imbalance control on consumers will be described. A consumer who manages an area plans the amount of power to be purchased at the time of power purchase planning, and purchases power at a predetermined unit price for the amount of power purchased. When a usage shortage occurs and the difference is below -3%, the consumer can sell the generated power to a power supplier (for example, a general electric utility, a PPS (Power Producer and Supplier), etc.) at a first unit price (for example, 0 yen). When a usage shortage occurs and the difference is -3 to 0%, the consumer can sell the generated power at a second unit price (for example, 7.83 yen/kWh) higher than the first unit price. Therefore, when the excess of the actual usage amount relative to the planned power purchase amount is within a predetermined range, an economic benefit is given to the consumer.

Furthermore, when overuse occurs and the difference is between 0 and 3%, the consumer must purchase the generated electricity from the electricity supplier at a third unit price (e.g., 11.66 yen/kWh) higher than the second unit price, and when the difference exceeds 3%, the consumer must purchase the generated electricity at a fourth unit price (e.g., 32.42 to 40.69 yen/kWh) higher than the third unit price. Therefore, the greater the shortfall in the actual amount of electricity purchased compared to the planned amount of electricity purchase, the greater the economic penalty imposed on the consumer.

The imbalance is leveled out by having the storage battery 200 absorb the difference between the amount of power purchased set in the power purchase plan (power purchase plan value) and the amount of power actually consumed by the consumer (actual power purchase value). For example, the control unit 110 compensates for the power shortage by discharging the storage battery 200 when the actual power purchase value is higher than the power purchase plan value, and eliminates the imbalance by having the storage battery 200 charge the storage battery 200 to consume the excess power when the actual power purchase value is lower than the power purchase plan value.

The imbalance may be the difference between the instantaneous value of the actual power purchase value and the planned value of the power purchase from the grid 10 at the same time. The specified time period for the imbalance may represent, for example, a time period on the order of a few seconds or a few minutes. In this case, the imbalance may be the difference between the integrated value of the actual power purchase value and the integrated value of the power purchase plan from the grid 10 within the same specified time period.

When the target range value is a positive value, it corresponds to a control that encourages power purchases compared to the power purchase plan, that is, that encourages charging of power from the grid 10 to the storage battery 200, so the storage battery 200 is more likely to be charged compared to when the target range value is 0%. In other words, the control when the target range value is a positive value can be said to be a control that suppresses discharging of the storage battery 200.

On the other hand, when the target range value is a negative value, it corresponds to a control that suppresses power purchases compared to the power purchase plan, that is, suppresses charging of power from the grid 10 to the storage battery 200, so the storage battery 200 is more likely to discharge than when the target range value is 0%. In other words, the control when the target range value is a negative value can be said to be a control that suppresses charging of the storage battery 200.

In this way, the control unit 110 can set the target range value in the range of -∞% to +∞%. Furthermore, the target range value may or may not depend on the type of disaster and the amount of power stored in the storage battery 200, and the target range value may be temporarily set depending on the type of disaster and the amount of power stored in the storage battery 200.

The control unit 110 may also control the operating state of the storage battery 200 in the normal mode so that the target range value becomes the normal reference value. The normal reference value refers to, for example, a state in which the target range value is 0%, but is not limited to this. For example, the normal reference value may be +1%. The control unit 110 may also set the target range value based on disaster information and the amount of stored power in the storage battery 200. This allows the control unit 110 to control the storage battery 200 while taking into account the imbalance based on the amount of stored power in the storage battery 200, even if a disaster occurs. Therefore, the storage battery 200 can be charged in preparation for a power outage caused by a disaster, while appropriately considering the degree of imbalance according to the amount of stored power in the storage battery 200.

When the communication unit 120 acquires disaster information including information indicating that a disaster is predicted to occur within a disaster forecast time from the current time, the control unit 110 may set the operation state of the storage battery 200 to a power outage preparation mode that suppresses the discharge of the storage battery 200 more than in the normal mode. The power outage preparation mode may be a mode in which the operation state of the storage battery 200 prepares for a power outage while executing imbalance control. In this way, by setting in advance a mode for preparing for a power outage while executing imbalance control as the operation mode of the storage battery 200, not only for preparing for a future power outage but also for preparing for a power outage, the control unit 110 can use the power of the storage battery 200 stored up until the time of the disaster as a disaster power source even in the event of a disaster. In addition, since the power outage preparation mode is a mode that suppresses the discharge of the storage battery 200 more than in the normal mode, the amount of storage battery 200 lost due to discharge can be further reduced. As a result, in this embodiment, the storage battery 200 can be charged more efficiently in preparation for a power outage caused by a disaster.

When the amount of stored power in the storage battery 200 falls below a predetermined threshold, the control unit 110 may set the target range value to a value greater than the normal reference value. For example, in normal mode, when the target range value is set to 0% as the normal reference value, the communication unit 120 acquires information on the occurrence of a disaster within the disaster forecast time and the amount of stored power in the storage battery 200, and when the amount of stored power in the storage battery 200 is low, the target range value can be set to a value such as 3%. This increases the frequency with which the power supply within a unit time exceeds the power demand, making it possible to increase the amount of power that can be supplied to the storage battery 200. As a result, in this embodiment, the storage battery 200 can be charged more efficiently.

The control unit 110 may set the target range value so that the amount of stored power in the storage battery 200 exceeds a predetermined amount of stored power within the disaster forecast time from the current time. For example, if the storage battery 200 is to be fully charged within three hours from the current time, the target range value may be set to 3%, and if the storage battery 200 is to be fully charged within one hour from the current time, the target range value may be set to 5%. In this way, by setting the target range value to a larger value as the time to charge the storage battery 200 up to the predetermined time becomes shorter, it becomes possible to further increase the amount of power that can be supplied to the storage battery 200, and to efficiently charge the storage battery 200 in a short time.

The control unit 110 may set a target range value based on the amount of stored power in the storage battery 200 and the charging speed of the storage battery 200. The charging speed of the storage battery 200 represents the charging speed per unit time. In general, the charging speed of a storage battery varies depending on the period of use, the state of deterioration, etc. By the control unit 110 setting a target range value based on such a charging speed specific to each storage battery, the storage battery 200 can be charged in preparation for a power outage caused by a disaster. In this embodiment, the charging speed of the storage battery 200 may be stored in the memory unit 130.

For example, when charging to full charge within three hours, the communication unit 120 obtains the charging speed of the storage battery 200 from the memory unit 130, and the control unit 110 may determine, based on the value of the charging speed, how many hours from the current time to increase the target range value in order to fully charge the amount of stored electricity in the storage battery 200 within three hours.

The control unit 110 may also increase the target range value stepwise at predetermined time intervals. This makes it easier for the storage battery 200 to be charged as the time of the predicted power outage approaches, allowing the storage battery 200 to be charged more efficiently in preparation for a power outage caused by a disaster.

In addition, the control unit 110 may set the target range value to the normal reference value when the amount of charge stored in the storage battery 200 exceeds a predetermined threshold. This makes it possible to reduce the occurrence of imbalance while ensuring a predetermined amount of charge in preparation for a power outage.

When the communication unit 120 acquires power outage information, the control unit 110 may switch the operating state of the storage battery 200 to independent operation in which the storage battery 200 is disconnected from the grid 10. This allows the storage battery 200 to supply power to the load even when power is not supplied from the grid 10 due to a power outage.

Note that during independent operation, the storage battery 200 is disconnected from the grid 10, so imbalance control is not performed and the storage battery 200 operates in a load following mode that follows the power consumption of the load.

In addition, if the communication unit 120 does not acquire power outage information, the control unit 110 may maintain the operating state of the storage battery 200 in the power outage preparation mode.

When the communication unit 120 acquires disaster information including information that the disaster has ended, the control unit 110 may set the operating state of the storage battery 200 to the normal mode. This allows the control unit 110 to determine that no future disasters will occur, and therefore resets the operating state to the more economical normal mode, thereby achieving cost benefits. Note that the control unit 110 may set the operating state of the storage battery 200 to the normal mode when the communication unit 120 acquires disaster information including information that the disaster has ended, regardless of whether the storage battery 200 is in the load following mode or the power outage preparation mode.

In the present embodiment, the predetermined time for imbalance is described as being shorter than the disaster forecast time, in other words, the disaster forecast time is described as being longer than the predetermined time for imbalance, but the embodiment is not limited to this. The disaster forecast time may be shorter than the predetermined time for imbalance. A case in which the disaster forecast time is shorter than the predetermined time for imbalance is, for example, a case in which a disaster may occur suddenly. In this case, the communication unit 120 does not need to acquire disaster information.

Next, an example of the operation of the power management method of the power management system 1 will be explained using a flowchart.

As shown in FIG. 2, in step S310, the power management device 100 acquires the amount of stored power in the storage battery 200 from the storage battery 200. This acquisition may be performed at a predetermined time interval or may be performed continuously. Note that the following description will be given assuming that the operating state of the storage battery 200 is in normal mode.

In step S320, the power management device 100 determines whether or not disaster information indicating that a disaster is likely to occur has been acquired. If the power management device 100 determines that disaster information indicating that a disaster is likely to occur has been acquired (S320: Yes), the process proceeds to step S330. Note that if the power management device 100 determines that disaster information has not been acquired, or that disaster information indicating that a disaster is likely to occur has not been acquired (S320: No), the process proceeds to step S340.

In step S330, the power management device 100 sets the operating state of the storage battery 200 to power outage preparation mode and proceeds to step S340.

In step S340, the power management device 100 determines whether or not power outage information has been acquired. If the power management device 100 determines that power outage information has been acquired (S340: Yes), the process proceeds to step S340. If the power management device 100 determines that power outage information has not been acquired (S340: No), the process proceeds to step S350.

In step S350, the power management device 100 switches the operating state of the storage battery 200 to independent operation in which the storage battery 200 is disconnected from the grid 10, and proceeds to step S370.

In step S360, the power management device 100 determines whether the disaster forecast time has passed. If the power management device 100 determines that the disaster forecast time has passed (S360: Yes), the power management device 100 proceeds to step S380. If the power management device 100 determines that the disaster forecast time has not passed (S360: No), the power management device 100 returns to step S340.

In step S370, the power management device 100 determines whether or not information regarding the end of the disaster has been acquired. The power management device 100 may also determine whether or not disaster information including information regarding the end of the disaster has been acquired. If the power management device 100 determines that information regarding the end of the disaster has been acquired (S370: Yes), the power management device 100 proceeds to step S380. If the power management device 100 determines that information regarding the end of the disaster has not been acquired (S370: No), the power management device 100 returns to step S370.

In step S380, the power management device 100 sets the operating state of the storage battery 200 to normal mode and ends the process. Specifically, the power management device 100 switches the operating state of the storage battery 200 from power outage preparation mode or independent operation to normal mode. Note that, although the operating state of the storage battery 200 is set to normal mode in step S380, if the power management device 100 does not acquire either disaster information or power outage information from the external server 20, it is assumed that the operating state of the storage battery 200 is maintained in normal mode.

Next, an example of the operation of setting the power outage preparation mode of the power management device 100 (step S330) will be described.

As shown in FIG. 3, in step S331, the power management device 100 determines whether the value of the stored power amount of the storage battery 200 is less than a predetermined stored power amount. If the power management device 100 determines that the value of the stored power amount is less than the predetermined stored power amount (S331: Yes), the power management device 100 proceeds to step S332. Note that if the power management device 100 determines that the value of the stored power amount is not less than the predetermined stored power amount (S331: No), the power management device 100 proceeds to step S333.

In step S332, the power management device 100 generates a control command to be transmitted to the storage battery 200. Specifically, the power management device 100 sets a target range value for the storage battery 200 to a value greater than the normal reference value, and controls the storage battery 200 to control the operating state of the storage battery 200 according to the set target range value.

In step S333, the power management device 100 generates a control command to be transmitted to the storage battery 200. Specifically, the control unit 110 sets the target range value of the storage battery 200 as a normal reference value, and controls the storage battery 200 to control the operating state of the storage battery 200 according to the set target range value.

In other words, the power management method of the power management device 100 in this embodiment may be a power management method that controls the charging and discharging of the storage battery 200 so that the imbalance, which is the difference between the planned value for power purchase from the grid 10 and the actual value for power purchase within a specified time period, falls within a target range value.

The power management method of the power management device 100 in this embodiment may also include a step of controlling the operating state of the storage battery 200 in normal mode so that the target range value, which is the difference between the power purchase plan value and the actual power purchase value, becomes the normal reference value.

The power management method of the power management device 100 in this embodiment may also include a step of acquiring disaster information and the amount of stored power in the storage battery 200, and a step of setting a target range value based on the disaster information and the amount of stored power in the storage battery 200. As a result, the power management method of the power management device 100 can control the storage battery 200 taking into account the imbalance based on the amount of stored power in the storage battery 200, even when a disaster occurs.

The target range value set in each step may be stored by the memory unit 130. The target range value stored by the memory unit 130 may be referenced by the control unit 110 when setting the target range value. For example, if the target range value was set to +3% in the previous power outage preparation mode, the target range value may be set by referring to the value of +3%.

Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and corrections based on the present disclosure. Therefore, it should be noted that these modifications and corrections are included in the scope of the present invention. For example, the functions included in each component, each step, etc. can be rearranged so as not to cause logical contradictions, and multiple components, steps, etc. can be combined into one or divided. In addition, while the present invention has been described mainly with respect to an apparatus, the present invention can also be realized as a method, a program, or a storage medium storing a program executed by a processor provided in the apparatus, and it should be understood that these are also included in the scope of the present invention. In this case, the storage medium can be a hard disk drive, an optical disk, a CD-ROM, a CD-R, a memory card, a ROM, etc.

The "Sustainable Development Goals (SDGs)" are 17 international goals adopted at the United Nations Summit in September 2015. A power management device, a power management system, and a power management method according to an embodiment can contribute to the achievement of the 17 SDGs, for example, goals "7. Affordable and clean energy for all,""9. Build resilient infrastructure, promote industry, innovation and infrastructure," and "11. Make cities and towns sustainable."

Reference Signs List 1 Power management system 10 System 20 External server 30 Network 100 Power management device 110 Control unit 120 Communication unit 130 Storage unit 200 Storage battery 300 Power meter

Claims (10)

A power management device that controls charging and discharging of a storage battery so that an imbalance, which is a difference between a planned value for purchasing power from a grid and an actual value for purchasing power within a predetermined time period, falls within a target range value,
A control unit that controls an operating state of the storage battery;
A communication unit capable of acquiring disaster information and a storage amount of the storage battery,
the control unit controls an operating state of the storage battery in a normal mode so that the target range value becomes a normal reference value;
A power management device that sets the target range value based on the disaster information and the stored power amount. 2. The power management apparatus of claim 1,
The control unit of the power management device sets the operating state of the storage battery to a power outage preparation mode that suppresses discharge of the storage battery more than in the normal mode when the communication unit acquires disaster information including information that a disaster is predicted to occur within a disaster forecast time from the current time. 3. The power management device of claim 2,
The control unit sets the target range value to a value greater than the normal reference value when the stored power amount falls below a predetermined threshold. 4. The power management device of claim 3,
The control unit sets the target range value so that the stored power amount exceeds a predetermined stored power amount within a disaster forecast time from the current time. 5. The power management device according to claim 1,
The communication unit further acquires a charging speed of the storage battery ,
The control unit sets the target range value based on the amount of stored power and a charging rate of the storage battery. 5. The power management device according to claim 3 ,
The control unit sets the target range value as the normal reference value when the stored power amount exceeds the predetermined threshold. 7. The power management device according to claim 1,
The control unit switches the operation state of the storage battery to an independent operation in which the storage battery is disconnected from the grid when the communication unit acquires power outage information. 8. The power management device according to claim 1,
The control unit sets the operating state of the storage battery to the normal mode when the communication unit acquires disaster information including information regarding the end of the disaster. A power management system including a storage battery and a power management device that controls charging and discharging of the storage battery so that an imbalance, which is a difference between a planned value for purchasing power from a grid and an actual value for purchasing power within a predetermined time period, falls within a target range value,
The power management device includes:
A control unit that controls an operating state of the storage battery;
A communication unit capable of acquiring disaster information and a stored power amount of the storage battery,
the control unit controls an operating state of the storage battery in a normal mode so that the target range value becomes a normal reference value;
The power management system sets the target range value based on the disaster information and the stored power amount. A power management method for controlling charging and discharging of a storage battery so that an imbalance, which is a difference between a planned value for purchasing power from a grid and an actual value for purchasing power within a predetermined time period, falls within a target range value,
controlling an operating state of the storage battery in a normal mode so that the target range value becomes a normal reference value;
Acquiring disaster information and a stored power amount of the storage battery;
setting the target range value based on the disaster information and the stored power amount.

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