Power management device, power management system, and power management method

Abstract

The power management device responds to Demand Response (DR) requests from the higher-level power management device. There is room for improvement in properly controlling the energy storage device and reducing DR losses. [Solution] The power management device comprises a control unit and a communication unit. The control unit identifies a time period that satisfies predetermined conditions and creates SOC correction information indicating that the SOC of the storage battery will not be corrected during that time period based on the open-circuit voltage of the storage battery. The communication unit transmits the SOC correction information to the energy storage device or a lower-level power management device.

Description

Technical Field

[0001] The present disclosure relates to a power management device, a power management system, and a power management method.

Background Art

[0002] In recent years, in order to stabilize the power supply-demand balance of the power system, there is a mechanism (hereinafter, VPP (Virtual Power Plant)) that uses distributed power sources such as energy storage devices. Further, it is known that a power management device manages distributed power sources used in a VPP (for example, Patent Documents 1 and 2). P (For example, Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] The power management device has room for improvement in reducing the loss of DR in response to a DR (Demand Response) request from a higher-level power management device. There is room for improvement in reducing the loss of DR.

Means for Solving the Problems

[0005] One aspect of the present disclosure includes a control unit that creates SOC correction information indicating that a correction of the SOC of the storage battery is not performed in a time zone that satisfies a predetermined condition based on the open-circuit voltage of the storage battery, and a communication unit that transmits the SOC correction information to the energy storage device or a lower-level power management device. A power management device comprising:

[0006] One aspect of the present disclosure is a power management device comprising: a control unit that identifies a time period that satisfies predetermined conditions and creates SOC correction information indicating that the SOC of the storage battery should be corrected at a time period other than the specified time period based on the open-circuit voltage of the storage battery; and a communication unit that transmits the SOC correction information to the energy storage device or a lower-level power management device.

[0007] One aspect of the present disclosure is a power management system comprising: a power management device having a control unit that creates SOC correction information indicating that the SOC of the storage battery will not be corrected during the time period based on the open-circuit voltage of the storage battery; and a communication unit that transmits the SOC correction information to a storage device or a lower-level power management device; and a higher-level power management device having a control unit that identifies a time period that satisfies predetermined conditions; and a communication unit that transmits specific time period information indicating the time period to the power management device.

[0008] One aspect of the present disclosure is a power management system comprising: a power management device having a control unit that creates SOC correction information indicating that the SOC of a storage battery is corrected at a time other than the time period based on the open-circuit voltage of the storage battery; and a communication unit that transmits the SOC correction information to a storage device or a lower-level power management device; and a higher-level power management device having a control unit that identifies a time period that satisfies predetermined conditions; and a communication unit that transmits specific time period information indicating the time period to the power management device.

[0009] One aspect of the present disclosure is a power management method comprising the steps of: identifying a time period that satisfies predetermined conditions, creating SOC correction information indicating that the SOC of the storage battery will not be corrected during that time period based on the open-circuit voltage of the storage battery; and transmitting the SOC correction information to a power storage device or a lower-level power management device.

[0010] One aspect of this disclosure identifies a time period that satisfies certain conditions and determines the open-circuit voltage of the battery. The power management method comprises the steps of: creating SOC correction information indicating that the SOC of the storage battery is to be corrected during a time period other than the aforementioned time period; and transmitting the SOC correction information to a power storage device or a lower-level power management device. [Effects of the Invention]

[0011] The power management device described herein can appropriately control energy storage devices in response to DR requests from higher-level power management devices, thereby reducing DR losses. [Brief explanation of the drawing]

[0012] [Figure 1] Figure 1 shows a power management system 1 according to an embodiment. [Figure 2] Figure 2 shows a facility 10 according to an embodiment. [Figure 3] Figure 3 shows a power storage device 112 according to an embodiment. [Figure 4] Figure 4 shows a subordinate management server 20 according to an embodiment. [Figure 5] Figure 5 shows a higher-level management server 30 according to an embodiment. [Figure 6] Figure 6 shows the control plan information for the battery 1122 according to the embodiment, and the time period when adjustment of adjustable power is requested or the time period when adjustment of adjustable power is likely to be requested. [Figure 7] Figure 7 shows the control plan information for the battery 1122 according to this embodiment, and the predicted unit price of the procured electricity. [Figure 8] Figure 8 shows the control plan information for the battery 1122 and the predicted value of the outside temperature of the battery 1122 according to this embodiment. [Figure 9] Figure 9 shows a power management method according to an embodiment. [Modes for carrying out the invention]

[0013] Embodiments will be described below with reference to the drawings. In the drawings, parts having similar configurations and functions are denoted by the same reference numerals, and the drawings are schematic in nature.

[0014] [Embodiment] (Power management system) Hereinafter, the power management system 1 according to the embodiment will be described.

[0015] As shown in FIG. 1, the power management system 1 may include a facility 10, a lower-level management server 20, a higher-level management server 30, and a network 40.

[0016] Here, the facility 10, the lower-level management server 20, and the higher-level management server 30 may be configured to be communicable via the network 40. The network 40 may include the Internet, may include a dedicated line such as a VPN (Virtual Private Network), and may include a mobile communication network.

[0017] The facility 10 is connected to the power system 50, and power may be supplied from the power system 50 or power may be supplied to the power system 50. In FIG. 1, facilities 10A to 10C are illustrated as the facility 10. The facility 10 may be a facility such as a house, a facility such as a store, a facility such as an office, or a facility such as a factory. The facility 10 may be a complex facility including at least two or more of houses, stores, offices, and factories. Details of the facility 10 will be described later (see FIG. 2).

[0018] The lower-level management server 20 is a server managed by an operator who manages the power of the facility 10. The lower-level management server 20 may be a resource aggregator (RA). One or more facilities 10 managed by the lower-level management server 20 may be referred to as a facility group 10 . The lower-level management server 20 may also be referred to as a power management device or a lower-level power management device. Here, "lower-level" may indicate a management server that receives information from other management servers, or may indicate a management server that transmits information to other management servers. Details of the lower-level management server 20 will be described later (see FIG. 4).

[0019] The higher-level management server 30 is a server managed by the business operator that manages the power of the power grid 50. The higher-level management server 30 may also be managed by the business operator that provides various services. The higher-level management server 30 may be an aggregation coordinator (AC) or an AEMS (Area Energy Management System). The higher-level management server 30 is It may also be called a power management device or a higher-level power management device. Here, "higher level" may refer to a management server that receives information from other management servers, or a management server that transmits information to other management servers. Details of the higher-level management server 30 will be described later (see Figure 5).

[0020] The business operator may be a retail electricity business operator. The retail electricity business operator may include a regional power company (general electricity business operator) that manages the power grid 50, or it may include a new electricity business operator other than a regional power company. The new electricity business operator may be expected to sell electricity to the facility 10 by procuring electricity from the electricity market.

[0021] The service may also involve a business operator managing the power of the power grid 50 supplying the transmission and distribution business operator with adjustable power (hereinafter referred to as "adjustable power") necessary to adjust the balance between power supply and demand. The service may also include the business operator managing the power of the power grid 50 providing a benefit to owner A of facility 10 by selling owner A's adjustable power to owner B of another facility 10. Such adjustable power can be secured, for example, by keeping the difference (imbalance) between the planned value for the power procured by the group of facilities 10 (hereinafter referred to as "planned power procured value") and the actual value for the power procured by the group of facilities 10 (hereinafter referred to as "actual power procured value") below a predetermined difference. Alternatively, adjustable power may be secured by keeping the difference (imbalance) between the planned value for the power generated by the group of facilities 10 (hereinafter referred to as "planned power generated value") and the actual value for the power generated by the group of facilities 10 (hereinafter referred to as "actual power generated value") below a predetermined difference.

[0022] The period during which the imbalance between procured and generated power is confirmed may be defined as the target period (e.g., one day). In such cases, the planned value for procured power may include plans formulated at a time prior to the target period (e.g., 12:00 the day before the target period). The planned value for generated power may also include plans formulated at a time prior to the target period (e.g., 12:00 the day before the target period). Furthermore, the planned value for procured power may include plans formulated at a time prior to a unit period included in the target period (e.g., one hour before the unit period). The planned value for generated power may also include plans formulated at a time prior to a unit period included in the target period (e.g., one hour before the unit period).

[0023] The planned and actual procured power values ​​may be reported by the lower-level management server 20 or the higher-level management server 30. The planned and actual generated power values ​​may also be reported by the lower-level management server 20 or the higher-level management server 30.

[0024] (facility) The facility 10 according to this embodiment will be described below. As shown in Figure 2, the facility 10 may include an EMS (Energy Management System) 11, a measuring device 12, a solar cell device 111, a power storage device 112, a fuel cell device 113, and load equipment 114.

[0025] The solar cell system 111 is a distributed power source that generates electricity in response to light such as sunlight. The solar cell system 111 has a PCS (Power Conditioning System) and solar panels. Good. The solar cell device 111 and the power grid 50 may be connected.

[0026] The energy storage device 112 is a distributed power source that charges and discharges electricity. The energy storage device 112 may be connected to the power grid 50.

[0027] The fuel cell system 113 is a distributed power source that generates electricity using fuel. The fuel cell system 113 may include a PCS and fuel cell cells. The fuel cell system 113 may be connected to the power grid 50.

[0028] The fuel cell device 113 is a solid oxide fuel cell (SOFC). However, it is a polymer electrolyte fuel cell (PEFC). It is also possible to use a phosphoric acid fuel cell (PAFC), and it may also be a melting fuel cell. A molten carbonate fuel cell (MCFC) may also be used.

[0029] The load device 114 is a device that consumes electricity. The load device 114 may include air conditioning equipment, heat pump water heaters, lighting equipment, etc.

[0030] The EMS 11 manages the power supply for facility 10. The EMS 11 may also control the solar cell equipment 111, the energy storage device 112, the fuel cell equipment 113, and the load equipment 114.

[0031] The EMS 11 may have a receiving unit that receives control plan information from the subordinate management server 20, and may also have a transmitting unit that transmits sensor information, SOC information, specific time period information, or facility information to the subordinate management server 20. The EMS 11 may control the energy storage device 112 based on the control plan information.

[0032] The control plan information is information that indicates the operating mode of the battery 1122 for each unit period that constitutes the control plan target period (hereinafter referred to as the control plan unit period) (for example, discharge mode, charge mode, standby mode, SOC correction mode). The control plan information may also include values ​​related to the discharge power and charge power of the battery 1122. The SOC correction mode is an operating state that corrects the SOC of the battery 1122. The SOC correction mode may consist of a charge plan for the battery 1122 and a standby plan for the battery 1122. The charge plan for the battery 1122 is a plan for charging the battery 1122 to a predetermined charge level. The standby plan for the battery 1122 is a plan for measuring the open-circuit voltage when the battery 1122 is disconnected from the circuit.

[0033] The control plan information may include SOC correction information indicating that the SOC of the battery 1122 will not be corrected based on the open-circuit voltage of the battery 1122 during a time period that satisfies predetermined conditions. In other words, the control plan information may include SOC correction information indicating a control plan unit period in which the SOC correction mode, which is an operating state in which the SOC of the battery 1122 is corrected, is not performed.

[0034] The control plan information may include SOC correction information indicating that the State of Charge (SOC) of the battery 1122 will be corrected based on the open-circuit voltage of the battery 1122 during times other than those that satisfy predetermined conditions. In other words, the control plan information may include SOC correction information indicating the control plan unit period during which the SOC correction mode, which is an operating state in which the SOC of the battery 1122 is corrected, is performed.

[0035] The sensor information is information indicating values ​​obtained from the current sensor 1123, temperature sensor 1124, or voltage sensor 1125 installed in the energy storage device 112. The SOC information is information indicating the measured value or estimated value of the SOC of the battery 1122 calculated from the sensor information. The SOC information is information indicating the correction of the SOC of the battery 1122. The information may include a time period or time, or it may include a time period or time for correcting the State of Charge (SOC) of the battery 1122. The specific time period information is information indicating a time period that satisfies predetermined conditions identified by the higher-level management server 30.

[0036] Facility information is information indicating values ​​related to the power of distributed power sources (e.g., solar cell equipment 111, energy storage equipment 112, or fuel cell equipment 113), measuring devices 12, or load equipment 114 installed in facility 10. Specifically, facility information may include planned values ​​for the power consumption of facility 10, or actual values ​​for the power consumption of facility 10. Facility information may include planned values ​​for the power generated by distributed power sources connected to facility 10, or actual values ​​for the power generated by distributed power sources connected to facility 10. Facility information may include planned values ​​for the power demand of facility 10, or actual values ​​for the power demand of facility 10. Note that power demand is the power consumption minus power generation. Facility information may also include information indicating values ​​related to adjustable power in response to DR requests at each facility 10 connected to the power grid 50 (hereinafter referred to as information on adjustable power). Facility information may also include information on adjustable power for each control planning unit period (e.g., 30 minutes). The facility information may include temperature information indicating the temperature around the distributed power source (for example, the battery 1122) installed in facility 10. Here, the temperature information indicating the temperature around the distributed power source may be information indicating values ​​obtained from a temperature sensor installed indoors if the distributed power source is indoors, or information indicating values ​​obtained from weather information at the installation location of the distributed power source if the distributed power source is outdoors. The weather information may be information indicating values ​​observed by the Japan Meteorological Agency, or information indicating values ​​obtained from a temperature sensor installed outdoors. The temperature information indicating the temperature around the distributed power source may also be information indicating values ​​obtained from the temperature sensor 1124.

[0037] The values ​​related to adjustable power may be expressed as energy [Wh], power [W], instantaneous power [ΔW], current [A], energy [J], etc. Energy [J] may be interpreted as energy [Ws]. Furthermore, current [A] can be considered to be usable in the same way as power [W], assuming that the voltage [V] supplied to facility 10 is approximately constant. Also, "value" may be interpreted as "quantity" or as "physical quantity".

[0038] The receiving unit of EMS11 may receive sensor information, SOC information, or facility information from the communication unit 1126. The transmitting unit of EMS11 may transmit control plan information to the communication unit 1126. EMS11 may also be referred to as a Gateway, or simply as a control unit. It is also acceptable to use LEMS (Local EMS) to distinguish EMS11 from the subordinate management server 20. It may also be called HEMS (Home EMS), or DSR-MS (Demand Side Resources - Energy Management System).

[0039] The EMS 11 may identify a time period that satisfies predetermined conditions. The EMS 11 may create specific time period information indicating the identified time period. This allows the subordinate management server 20, upon receiving the specific time period information, to create SOC correction information indicating that the SOC correction of the battery 1122 will not be performed based on the open-circuit voltage of the battery 1122 during the time period that satisfies the predetermined conditions.

[0040] The measuring device 12 measures the power demand. The measuring device 12 may be a Smart Meter belonging to the power company. The measuring device 12 measures the measurement results at the first interval (for example, 30 minutes). The measuring device 12 may transmit an information element indicating the integrated value of the power demand to the EMS 11 at each first interval. The measuring device 12 may also transmit an information element indicating the measurement result at a second interval shorter than the first interval (for example, 1 minute) to the EMS 11.

[0041] The entity that transmits information regarding the control of distributed power sources connected to facility 10 may be referred to as DSR-MS. The subordinate management server 20 or EMS 11 may constitute the DSR-MS. .

[0042] (Energy storage device) The following describes the energy storage device 112 according to the embodiment. As shown in Figure 3, the energy storage device 112 may include a PCS 1121, a battery 1122, a current sensor 1123, a temperature sensor 1124, a voltage sensor 1125, a communication unit 1126, a management unit 1127, and a control unit 1128. The PCS 1121, the battery 1122, the current sensor 1123, the temperature sensor 1124, the voltage sensor 1125, the communication unit 1126, the management unit 1127, and the control unit 1128 are connected via a wired connection, for example, CAN (Controller Area Network). Alternatively, they may be connected to each other wirelessly so that they can communicate with one another.

[0043] PCS1121 converts DC power discharged from the battery 1122 to AC power. PCS1121 also converts AC power supplied to the battery 1122 from an external source to DC power.

[0044] The storage battery 1122 is a rechargeable battery, such as a lithium-ion battery. The storage battery 1122 may consist of one or more cells. Multiple cells of the storage battery 1122 may be connected in series or in parallel. The energy storage device 112 may consist of multiple storage batteries 1122 connected in series or in parallel.

[0045] The current sensor 1123 measures the charge and discharge current value flowing through the battery 1122. The charge and discharge current value flowing through the battery 1122 may be the current value being charged into the battery 1122 or the current value being discharged from the battery 1122. The current sensor 1123 may be connected in series with one terminal of the battery 1122. The current sensor 1123 is not limited to one terminal of the battery 1122, but may be connected at any position where the current value flowing through the battery 1122 can be measured.

[0046] The temperature sensor 1124 measures the temperature of the battery 1122. The temperature sensor 1124 may be installed on the outer surface of one terminal of the battery 1122. The temperature sensor 1124 is not limited to the outer surface of one terminal of the battery 1122, but may be installed at any location where the temperature of the battery 1122 can be measured.

[0047] The voltage sensor 1125 measures the voltage value of the battery 1122. The voltage value of the battery 1122 may be the voltage value during charging and discharging, or the open-circuit voltage value when no current is flowing. The voltage sensor 1125 may be connected in parallel to both terminals of the battery 1122. The voltage sensor 1125 is not limited to both terminals of the battery 1122, but may be installed at any location where the voltage value of the battery 1122 can be measured.

[0048] The communication unit 1126 may be composed of a communication module. The communication module is a wireless communication module compliant with standards such as IEEE802.11a / b / g / n / ac / ax / be, ZigBee, Wi-SUN, LTE, 5G, and 6G. It may be a communication module, and is a wired communication module that complies with standards such as IEEE802.3. That's fine.

[0049] The communication unit 1126 may have a receiving unit that receives control plan information from the EMS 11, and may have a transmitting unit that transmits sensor information to the EMS 11. The transmitting unit of the communication unit 1126 may transmit SOC-related information or facility information to the EMS 11. The receiving unit of the communication unit 1126 may receive control plan information from the subordinate management server 20. The transmitting unit of the communication unit 1126 may transmit sensor information or specific time period information to the subordinate management server 20. The transmitting unit of the communication unit 1126 may transmit SOC-related information or facility information to the subordinate management server 20.

[0050] The management unit 1127 may be composed of storage media such as an HDD (Hard Disk Drive), an SSD (Solid State Drive), or non-volatile memory. The management unit 1127 may manage sensor information, information related to the State of Charge (SOC), facility information, control plan information, or an SOC-OCV curve representing the relationship between the charge rate of the battery 1122 and the battery 1122.

[0051] The control unit 1128 may include at least one processor. The at least one processor may consist of a single integrated circuit (IC) and multiple circuits (such as integrated circuits or discrete circuits) that are communicated together. It may be configured as follows.

[0052] The control unit 1128 calculates information regarding the State of Charge (SOC). The control unit 1128 may calculate information regarding the SOC, which indicates the measured value of the SOC of the battery 1122, based on the charge and discharge current values ​​that flowed through the battery 1122, which are included in the sensor information, using a current integration method. Alternatively, the control unit 1128 may calculate information regarding the SOC, which indicates the measured value of the SOC of the battery 1122, after correcting the charge and discharge current values ​​obtained by the current sensor 1123 for temperature, based on the temperature obtained by the temperature sensor 1124. This allows the lower management server 20 or the control unit 1128 to more accurately grasp the discrepancy between the measured value of the SOC of the battery 1122 and the estimated value of the SOC of the battery 1122, and to determine whether to prioritize correcting the SOC of the battery 1122 or to prioritize supplying adjustable power in response to a DR request.

[0053] The control unit 1128 may calculate SOC information indicating an estimated value of the state of charge (SOC) of the battery 1122 from the open-circuit voltage of the battery 1122 included in the sensor information. The control unit 1128 may also calculate SOC information indicating an estimated value of the SOC of the battery 1122 from the open-circuit voltage of the battery 1122 based on the SOC-OCV curve representing the relationship between the charge level of the battery 1122 and the battery 1122. Note that the subordinate management server 20 may calculate the SOC information indicating the measured value of SOC or the estimated value of SOC.

[0054] The control unit 1128 may identify a time period that satisfies predetermined conditions. The control unit 1128 may create specific time period information indicating the identified time period. This allows the subordinate management server 20, upon receiving the specific time period information, to create SOC correction information indicating that it will not perform SOC correction of the battery 1122 based on the open-circuit voltage of the battery 1122 during the time period that satisfies predetermined conditions.

[0055] (Lower-level management server) The subordinate management server 20 according to the embodiment will be described below. As shown in Figure 4, the subordinate management server 20 may have a communication unit 21, a management unit 22, and a control unit 23.

[0056] The communication unit 21 may be composed of a communication module. The communication module is a wireless communication module compliant with standards such as IEEE802.11a / b / g / n / ac / ax / be, ZigBee, Wi-SUN, LTE, 5G, and 6G. It may be a joule, and is a wired communication module that conforms to standards such as IEEE 802.3. That's good too.

[0057] The communication unit 21 may have a receiving unit that receives sensor information, SOC information, or facility information from the EMS 11, and may have a transmitting unit that transmits control plan information to the EMS 11. The receiving unit of the communication unit 21 may receive sensor information or SOC information from the communication unit 1126. The transmitting unit of the communication unit 21 may transmit control plan information to the communication unit 1126. The receiving unit of the communication unit 21 may receive report request information, specific time period information, or power adjustment request information from the higher-level management server 30. The transmitting unit of the communication unit 21 may transmit information to the higher-level management server 30. Upon receiving information regarding the report request from the management server 30, the system may simultaneously transmit adjustable power information to the higher-level management server 30.

[0058] The adjustable power information is information that indicates the value of the adjustable power of the facility group 10, calculated by the control unit 23 from the adjustable power information of the facility 10. The report request information indicates that the higher-level management server 30 is requesting adjustable power information.

[0059] The power adjustment request information indicates the time period during which the lower-level management server 20 is requested to make adjustments to the power supply and demand balance of the power grid 50, which the higher-level management server 30 has identified from the power adjustment information. The power adjustment request information may also include information indicating the unit price of the procured power when procuring power from the power grid 50 for each control planning unit period.

[0060] The communication unit 21 may periodically receive facility information of facility 10. The facility information may include information indicating the configuration of the distributed power sources that facility 10 possesses, and may also include information indicating the specifications of the distributed power sources that facility 10 possesses. The facility information may also include information indicating whether or not it participates in the adjustment of the power supply and demand balance of the power system 50 (for example, VPP control).

[0061] The management unit 22 may be composed of storage media such as an HDD (Hard Disk Drive), SSD (Solid State Drive), or non-volatile memory. The management unit 22 may also be configured to access information from a server via a network such as a cloud.

[0062] The management unit 22 may manage sensor information, SOC information, facility information, adjustment request power information, specific time period information, or an SOC-OCV curve representing the relationship between the charge rate of the battery 1122 and the battery 1122, received by the receiving unit of the communication unit 21.

[0063] The control unit 23 may include at least one processor. The at least one processor may consist of a single integrated circuit (IC) and consist of a plurality of communicatively connected circuits (such as integrated circuits or discrete circuits(s)). It may also be used.

[0064] The control unit 23 creates control plan information from the power adjustment request information or facility information. The control plan information may be transmitted all at once before the control plan period, covering the entire control plan period for the distributed power supply, or it may be transmitted sequentially for each control plan unit period, or it may be transmitted in real time at intervals shorter than the control plan unit period. Although not particularly limited, the control unit 23 may create the control plan information in a way that maximizes the benefits of facility 10.

[0065] The control unit 23 may correct the State of Charge (SOC) of the battery 1122 based on the open-circuit voltage of the battery 1122, or it may correct the SOC of the battery 1122 sequentially. The control unit 23 may also correct the SOC-OCV curve, which represents the relationship between the charge level of the battery 1122 and the battery 1122, based on the open-circuit voltage of the battery 1122 at a predetermined charge level. The open-circuit voltage at a predetermined charge level is the open-circuit voltage at any charge level of the battery 1122. Specifically, it may be the open-circuit voltage when the charge level of the battery 1122 is 100%, or it may be the open-circuit voltage when the charge level is 50%.

[0066] The control unit 23 may calculate the values ​​for the individual adjustment request power to be adjusted at facility 10 from the adjustment request power information received from the higher-level management server 30 as control plan information. For example, the control unit 23 assigns the values ​​for the individual adjustment request power to facility 10 such that the sum of the values ​​for the individual adjustment request power to be adjusted at facility 10 is equal to or greater than the values ​​for the adjustment request power of the group of facilities 10 included in the adjustment request power information. Note that the values ​​for the individual adjustment request power are for facility 10 They may be allocated to each individual facility, or they may be allocated to each distributed power source connected to facility 10.

[0067] The control unit 23 may identify time periods that satisfy predetermined conditions and create SOC correction information indicating that the correction of the battery 1122's SOC, which is performed based on the open-circuit voltage of the battery 1122, will not be performed during those time periods. Alternatively, the control unit 23 may identify time periods that satisfy predetermined conditions and create SOC correction information indicating that the correction of the battery 1122's SOC, which is performed based on the open-circuit voltage of the battery 1122, will be performed during those time periods. This allows the control unit 23 or the control unit 1128 to correct the discrepancy between the measured value of the battery 1122's SOC and the estimated value of the battery 1122's SOC, thereby understanding the actual value of the battery 1122's SOC and reducing the loss of DR due to being unable to respond to DR requests.

[0068] The control unit 23 may, as control planning information, identify time periods that satisfy predetermined conditions and create SOC correction information indicating that the correction of the SOC of the battery 1122, which is performed based on the open-circuit voltage of the battery 1122, will not be performed during time periods other than those that satisfy the predetermined conditions. The control unit 23 may, as control planning information, identify time periods that satisfy predetermined conditions and create SOC correction information indicating that the correction of the SOC of the battery 1122, which is performed based on the open-circuit voltage of the battery 1122, will be performed during time periods other than those that satisfy the predetermined conditions.

[0069] The control unit 23 may, as control planning information, identify time periods that satisfy predetermined conditions and create SOC correction information indicating the time at which the SOC of the battery 1122 is corrected based on the open-circuit voltage of the battery 1122 during time periods that satisfy predetermined conditions. The control unit 23 may, as control planning information, identify time periods that satisfy predetermined conditions and create SOC correction information indicating the time at which the SOC of the battery 1122 is corrected based on the open-circuit voltage of the battery 1122 during time periods other than those that satisfy predetermined conditions.

[0070] The control unit 23 may identify a time period that satisfies predetermined conditions, during which it is requested by the higher-level management server 30 to adjust the power supply and demand balance of the power system 50. This allows the control unit 23 to correct the State of Charge (SOC) of the battery 1122 while avoiding the time period during which DR requests are made. Since the battery 1122 is disconnected from the circuit when its SOC is corrected, it cannot respond to DR requests while its SOC is being corrected. If the time period during which DR requests are made and the time period during which the SOC of the battery 1122 is corrected overlap, the amount of adjustable power that can be supplied in response to DR requests will decrease, potentially resulting in DR losses. Therefore, by correcting the SOC of the battery 1122 while avoiding the time period during which DR requests are made, it is possible to increase the number of batteries 1122 that can supply adjustable power in response to DR requests from the higher-level management server 30. Thus, more adjustable power can be supplied in response to DR requests, and DR losses due to being unable to respond to DR requests can be reduced.

[0071] The control unit 23 may identify a predicted time period in which adjustments to adjustable power for adjusting the power supply and demand balance of the power system 50, transmitted from the higher-level management server 30, are requested as a time period that satisfies predetermined conditions. This allows the correction of the State of Charge (SOC) of the battery 1122 to be performed while avoiding time periods when DR requests are likely to occur. As a result, more adjustable power can be supplied in response to DR requests, and DR losses due to inability to respond to DR requests can be reduced.

[0072] The control unit 23 may calculate a predicted unit price for procured electricity, which is electricity procured from the power grid 50. The control unit 23 may identify time periods in which the predicted unit price is equal to or greater than a predetermined threshold, as time periods that satisfy predetermined conditions. The time period to satisfy the condition may be a time period in which the predicted electricity rate is below a predetermined threshold. This allows the control unit 23 to correct the State of Charge (SOC) of the battery 1122 while avoiding the time period in which the electricity rate is high. Since the battery 1122 needs to be charged to a predetermined level when its SOC is corrected, if the time period in which the electricity rate is high and the time period in which the SOC of the battery 1122 is corrected overlap, charging the battery 1122 to the predetermined level may result in higher electricity costs. Therefore, by the control unit 23 correcting the SOC of the battery 1122 while avoiding the time period in which the electricity rate is high, it is possible to procure electricity at a lower rate than the predetermined level and charge the battery 1122 to the predetermined level, thereby increasing the profits from responding to the demand response (DR) of the facility owner 10.

[0073] The control unit 23 may calculate a predicted ambient temperature by predicting the ambient temperature of the battery 1122 from temperature information indicating the ambient temperature around the distributed power source included in the facility information. The control unit 23 may identify a time period in which the predicted ambient temperature is below a predetermined threshold as a time period in which a predetermined condition is met. The control unit 23 may create control plan information that adds charging time for the battery 1122 when performing SOC correction mode during a time period in which the predicted ambient temperature is below a predetermined threshold. The control unit 23 may also identify a time period in which the predicted ambient temperature is above a predetermined threshold as a time period in which a predetermined condition is met. This allows the control unit 23 to perform SOC correction of the battery 1122 while avoiding the time period in which the ambient temperature is low. The battery 1122 needs to reach a predetermined charge level when correcting its SOC, but if the ambient temperature is low, it may not be possible to charge it sufficiently to the predetermined charge level. Therefore, by performing SOC correction of the battery 1122 while avoiding the time period in which the ambient temperature is low, it is possible to reduce DR failures due to the inability to charge the battery 1122 to the predetermined charge level.

[0074] If multiple candidate time periods for performing the SOC correction mode included in the operating mode of the energy storage device 112 are identified, the control unit 23 may select a time period that prioritizes satisfying one of the following conditions: a time period when adjustment of adjustable power is requested or a time period when adjustment of adjustable power is highly likely to be requested, a time period when the predicted charge unit price is above a predetermined threshold, and a time period when the predicted outside temperature is below a predetermined threshold. This allows the operator of the lower management server 20 to appropriately control the battery 1122 according to the items they want to prioritize, such as wanting to make a profit by responding to DR requests or not wanting to fail to respond to DR requests.

[0075] The control unit 23 may calculate a value relating to the difference between the measured value of the SOC of battery 1122 and the estimated value of the SOC of battery 1122. The control unit 23 may also determine whether the value relating to the difference between the measured value of the SOC of battery 1122 and the estimated value of the SOC of battery 1122 is greater than or equal to a predetermined threshold. This allows the control unit 23 to identify batteries 1122 that cannot respond to DR requests due to the discrepancy between the measured value of the SOC of battery 1122 and the estimated value of the SOC of battery 1122, thereby reducing DR failures. If the control unit 23 determines that the value relating to the difference between the measured value of the SOC of battery 1122 and the estimated value of the SOC of battery 1122 is greater than or equal to a predetermined threshold, it may instruct the communication unit 21 to transmit control plan information including SOC correction information to the EMS 11 or the communication unit 1126. The control unit 23 may determine whether the difference between the measured value of the SOC of the battery 1122 and the estimated value of the SOC of the battery 1122 is less than or equal to a predetermined threshold. If the control unit 23 determines that the difference between the measured value of the SOC of the battery 1122 and the estimated value of the SOC of the battery 1122 is less than or equal to a predetermined threshold, it may instruct the communication unit 21 to transmit control plan information including SOC correction information to the EMS 11 or the communication unit 1126.

[0076] The control unit 23 determines that the SOC correction of the battery 1122 is performed during the time period between the time period when the SOC correction of the battery 1122 included in the SOC information was last performed and the time period when the SOC correction of the battery 1122 included in the SOC information or SOC correction information is performed. If it is deemed that the SOC has been corrected, the SOC correction information is recreated. The control unit 23 may, for example, consider that the SOC of battery 1122 has been corrected if the SOC of battery 1122 remains at 100% (fully charged) for the same amount of time as the time required for the SOC correction mode included in the operating mode of battery 1122. This allows the control unit 23 to accurately identify batteries 1122 that cannot respond to DR requests and avoids performing unnecessary SOC corrections on batteries 1122, thereby increasing the number of batteries 1122 that can respond to DR requests and potentially increasing the benefits of responding to DR requests.

[0077] The control unit 23 may calculate adjustable power information that indicates a value related to adjustable power for adjusting the power supply and demand balance of the power system 50 connected to the facility group 10.

[0078] The control unit 23 may calculate adjustable power information that is obtained by subtracting the value of the adjustable power of the facility 10 during the period when the adjustment of adjustable power is requested from the upper management server 30 and the period when the SOC correction mode included in the operating mode of the battery 1122 is performed from the value of the adjustable power of the facility group 10.

[0079] The control unit 23 may calculate adjustable power information that is obtained by subtracting the value of the adjustable power of the facility 10 during the period when the adjustment of adjustable power is likely to be requested from the higher management server 30 and the period when the SOC correction mode included in the operating mode of the battery 1122 is performed from the value of the adjustable power of the facility group 10.

[0080] (Higher management server) The following describes the higher-level management server 30 according to the embodiment. As shown in Figure 5, the higher-level management server 30 may have a communication unit 31, a management unit 32, and a control unit 33.

[0081] The communication unit 31 is composed of communication modules. The communication modules are wireless communication modules compliant with standards such as IEEE802.11a / b / g / n / ac / ax / be, ZigBee, Wi-SUN, LTE, 5G, and 6G. It may be a wired communication module that complies with standards such as IEEE 802.3. .

[0082] The communication unit 31 may have a receiving unit that receives adjustable power information from the communication unit 21, and may have a transmitting unit that transmits information regarding report requests to the communication unit 21. When it is necessary to adjust the power supply and demand balance of the group of facilities 10 connected to the power grid 50, the transmitting unit of the communication unit 31 may transmit adjustment request power information or specific time period information to the communication unit 21 when the subordinate management server 20 requests adjustment of the power supply and demand balance of the group of facilities 10 connected to the power grid 50.

[0083] The management unit 32 may be composed of storage media such as an HDD (Hard Disk Drive), an SSD (Solid State Drive), or non-volatile memory.

[0084] The management unit 32 may manage adjustable power information.

[0085] The control unit 33 may include at least one processor. The at least one processor may consist of a single integrated circuit (IC) and may consist of a plurality of communicatively connected circuits (such as integrated circuits or discrete circuits(s)). It may also be used.

[0086] The control unit 33 creates adjustment request power information for the subordinate management server 20, indicating the value of the adjustment request power that the subordinate management server 20 is requested to adjust the power supply and demand balance of the power system 50 connected to the facility group 10.

[0087] The control unit 33 may identify the power adjustment request information from the adjustable power information received from the communication unit 21. Alternatively, the control unit 33 may calculate the adjustable power information from the adjustable power information received from the EMS 11 and create the power adjustment request information from the adjustable power information.

[0088] The control unit 33 may, when it is necessary to adjust the power supply and demand balance of the group of facilities 10 connected to the power grid 50, instruct the communication unit 31 to transmit power adjustment request information or specific time period information requested by the subordinate management server 20 to adjust the power supply and demand balance.

[0089] The control unit 33 may identify a time period that satisfies predetermined conditions. The control unit 33 may create specific time period information indicating the identified time period. As a result, the subordinate management server 20, upon receiving the specific time period information, can create SOC correction information indicating that it will not perform SOC correction of the battery 1122 based on the open-circuit voltage of the battery 1122 during the time period that satisfies predetermined conditions.

[0090] (Example of operation) The following describes a case in which sensor information, SOC information, and facility information are transmitted from the EMS11 to the subordinate management server 20, and the subordinate management server 20 creates SOC correction information.

[0091] Details of the control plan information are described below. The control plan unit period is set to 30 minutes. The subordinate management server 20 manages each control plan unit period in association with the control type (charge, discharge, SOC correction, standby). The SOC correction mode included in the operating modes of the battery 1122 requires a 9-hour control plan. The SOC correction mode consists of a 1-8 hour charge plan and a 1-8 hour standby plan for the battery 1122.

[0092] The following will be explained separately: identifying the time period when adjustment of adjustable power is requested or is likely to be requested, as shown in Figure 6; predicting the unit price of procured power, which is power procured from the power grid 50, as shown in Figure 7, and identifying the time period when the predicted unit price is above a predetermined threshold; and predicting the outside temperature of the energy storage device 112 from weather information of distributed power sources included in the facility information, as shown in Figure 8, and identifying the time period when the predicted outside temperature is below a predetermined threshold.

[0093] First, we will explain how to identify the time periods when adjustments to adjustable power are requested or when there is a high probability that adjustments to adjustable power will be requested.

[0094] Figure 6 shows the control plan for the battery 1122 installed in facility 10, and the time periods when adjustment of adjustable power is requested or when there is a high probability that adjustment of adjustable power will be requested.

[0095] The control unit 23 calculates adjustable power information from the facility information received from the EMS 11 by the receiving unit of the communication unit 21. The control unit 23 instructs the communication unit 21 to transmit the adjustable power information to the communication unit 31.

[0096] The receiving unit of the communication unit 31 receives adjustable power information transmitted from the transmitting unit of the communication unit 21. The control unit 33 receives the adjustable power information received by the receiving unit of the communication unit 31 and determines the power information to be adjusted. The control unit 33 creates a report. The control unit 33 instructs the communication unit 21 to transmit the power adjustment request information to the communication unit 21. The communication unit 31 transmits the power adjustment request information to the communication unit 21.

[0097] The communication unit 21 receives power adjustment request information transmitted from the communication unit 31. The control unit 23 predicts the time, time period, day of the week, or date on which adjustment of adjustable power is most likely to be requested, based on the power adjustment request information managed by the management unit 22.

[0098] As shown in Figure 6, the time periods during which adjustment of adjustable power is requested or is highly likely to be requested are 05:00-05:30 and 07:00-07:30. The control plan information includes information indicating the time period and information indicating the control type of the battery 1122. For example, the control plan information is information that associates information indicating the time period 05:00-05:30 with information indicating the discharge control type.

[0099] The control unit 23 creates SOC correction information indicating the time or time period for performing the SOC correction mode included in the operating mode of the battery 1122, so as to avoid two time periods, 05:00-05:30 and 07:00-07:30, which are time periods when adjustment of adjustable power is requested or when there is a high probability of such adjustment being requested.

[0100] As shown in Figure 6, SOC correction information is created to indicate that the SOC correction mode included in the operating mode of the energy storage device 112 will be performed during the time period from 18:00 to 03:00 the following day, which is a time period other than the two time periods of 05:00 to 05:30 and 07:00 to 07:30, during which adjustment of adjustable power is requested or is highly likely to be requested.

[0101] The control unit 23 instructs the communication unit 21 to transmit control plan information to the EMS 11. The communication unit 21 transmits the control plan information to the EMS 11.

[0102] The receiver of EMS11 receives control plan information transmitted from the transmitter of communication unit 21. EMS11 controls the operating mode of the battery 1122 according to the SOC correction information received by the receiver.

[0103] Next, we will explain how to identify the time period in which the predicted unit price of the electricity procured from the power grid 50 exceeds a predetermined threshold.

[0104] Figure 7 shows the control plan for the battery storage system 1122 installed in facility 10, and the predicted unit price of the procured electricity.

[0105] The control unit 23 predicts the unit price of procured electricity from the unit price of procured electricity managed by the management unit 22. The control unit 23 identifies the time period in which the predicted unit price of procured electricity is above a predetermined threshold.

[0106] As shown in Figure 7, the time periods in which the predicted electricity cost per unit exceeds a predetermined threshold are 11:30-13:00 and 12:00-13:30. The control plan information includes information indicating the time period and information indicating the control type of the battery 1122. For example, the control plan information is information that associates information indicating the time period 11:30-13:00 with information indicating the control type of charging.

[0107] The control unit 23 creates SOC correction information indicating the time or time period during which the SOC correction mode included in the operating mode of the battery 1122 is performed, so as to avoid two time periods, 11:30-13:00 and 12:00-13:30, which are time periods when the predicted unit price of procured power exceeds a predetermined threshold.

[0108] As shown in Figure 7, SOC correction information is created to indicate that the SOC correction mode included in the operating mode of the battery 1122 will be performed during the time period from 18:00 to 03:00 the following day, which is a time period other than the two time periods of 11:30 to 13:00 and 12:00 to 13:30, when the predicted unit price of procured power exceeds a predetermined threshold.

[0109] The control unit 23 instructs the communication unit 21 to transmit control plan information to the EMS 11. The communication unit 21 transmits the control plan information to the EMS 11.

[0110] The receiver of EMS11 receives control plan information transmitted from the transmitter of communication unit 21. EMS11 controls the charging and discharging of the battery 1122 according to the SOC correction information received by the receiver.

[0111] Finally, we will explain how to identify a time period in which the predicted outside temperature of the battery 1122, based on the temperature information included in the facility information, falls below a predetermined threshold.

[0112] Figure 8 shows the control plan for the battery 1122 installed in facility 10, and the predicted outside temperature for the battery 1122.

[0113] The control unit 23 predicts the ambient temperature of the battery 1122 from the ambient temperature of the battery 1122 managed by the management unit 22. The control unit 23 identifies the time period during which the predicted ambient temperature of the battery 1122 is below a predetermined threshold.

[0114] As shown in Figure 8, the predicted time periods during which the ambient temperature of the battery 1122 falls below a predetermined threshold are 02:30-04:00 and 03:30-05:00. The control plan information includes information indicating the time period and information indicating the control type of the battery 1122. For example, the control plan information is information that associates information indicating the time period of 02:30-04:00 with information indicating the control type of charge → discharge → charge.

[0115] The control unit 23 creates SOC correction information indicating the time or time period for performing the SOC correction mode included in the operating mode of the battery 1122, so as to avoid two time periods, 02:30-04:00 and 03:30-05:00, which are the time periods when the predicted outside temperature of the battery 1122 falls below a predetermined threshold.

[0116] As shown in Figure 8, SOC correction information is created to indicate that the SOC correction mode included in the operating mode of the battery 1122 will be performed during the time period from 18:00 to 03:00 the following day, which is a time period other than the two time periods of 02:30 to 04:00 and 03:30 to 05:00, when the predicted outside temperature of the battery 1122 is below a predetermined threshold.

[0117] The control unit 23 instructs the communication unit 21 to transmit control plan information to the EMS 11. The communication unit 21 transmits the control plan information to the EMS 11.

[0118] The receiver of EMS11 receives control plan information transmitted from the transmitter of communication unit 21. EMS11 controls the charging and discharging of the battery 1122 according to the SOC correction information received by the receiver.

[0119] (Power management method) The power management method according to the embodiment will be described below.

[0120] As shown in Figure 9, in step S10, the subordinate management server 20 controls the sensor of facility 10. The EMS11 receives planned values ​​for power demand, which are formulated at a time prior to the target period (for example, at 12:00 the day before the target period), along with service information, SOC information, and facility information. The EMS11 may autonomously transmit information regarding adjustable power, or it may transmit it periodically.

[0121] In step S20, the higher-level management server 30 sends information regarding the report request to the lower-level management server 20.

[0122] In step S21, the lower-level management server 20 transmits adjustable power information to the upper-level management server 30.

[0123] In step S22, the higher-level management server 30 sends power adjustment request information to the lower-level management server 20.

[0124] In step S30, the subordinate management server 20 identifies a time period that satisfies predetermined conditions.

[0125] In step S40, the subordinate management server 20 creates SOC correction information.

[0126] In step S50, the subordinate management server 20 transmits control plan information to the EMS 11.

[0127] In step S60, the EMS 11 controls the operating mode of the battery 1122 included in the facility 10 according to the control plan information.

[0128] [Other embodiments] Although the present invention has been described by the embodiments described above, the descriptions and drawings that constitute part of this disclosure should not be understood as limiting the invention. Various alternative embodiments, examples, and operational techniques will become apparent to those skilled in the art from this disclosure.

[0129] The disclosure described above describes a case where the lower-level management server 20 and the upper-level management server 30 are separate servers. However, the disclosure is not limited to this case. The lower-level management server 20 and the upper-level management server 30 may be a single server. In such a case, the function corresponding to the lower-level management server 20 may be called the VPP function, and the function corresponding to the upper-level management server 30 may be called the retail function.

[0130] The above disclosure provides an example of a case where the distributed power source used for VPP control is an energy storage device 112. However, the above disclosure is not limited to this. The distributed power source used for VPP control may also include a solar cell device 111, a fuel cell device 113, etc. The distributed power source used for VPP control may also include a diesel generator, a wind power generator, a geothermal power generator, etc.

[0131] In the disclosure described above, the distributed power source used for VPP control may be interpreted as a distributed power system including the EMS 11 and the energy storage device 112.

[0132] Although not specifically mentioned in the disclosure above, communication between the DSR-MS and the energy storage device 112 may be performed in a manner compliant with ECHONETLite®. Communication between the management server 20, or between the lower management server 20 and the upper management server 30, is via OpenADR. That's fine.

[0133] Although not specifically mentioned in the disclosure above, power can also be expressed as an instantaneous value (W / kW). It may also be expressed as an integrated value per unit time (Wh / kWh).

[0134] In the disclosure described above, electrical energy may be expressed in units such as kWh. Power is the amount of electrical energy per unit time and may be expressed in units such as kW. In particular, when there is no influence of the temporal element, electrical energy and power may be interpreted interchangeably.

[0135] Although not specifically mentioned in the disclosure above, a program may be provided that causes a computer to execute each of the processes performed by the subordinate management server 20. Furthermore, the program may be recorded on a computer-readable medium. Using a computer-readable medium makes it possible to install the program on a computer. Here, the computer-readable medium on which the program is recorded may be a non-transient recording medium. A non-transient recording medium is not particularly limited, but for example, it may be a recording medium such as a CD-ROM or DVD-ROM. That's good too. [Explanation of symbols]

[0136] 1: Power Management System 10: Facilities 11: EMS 12: Measuring device 111: Solar cell device 112: Energy storage device 1121:PCS 1122: Storage battery 1123: Current sensor 1124: Temperature sensor 1125: Voltage sensor 1126: Communications Department 1127: Management Department 1128: Control Unit 113: Fuel cell device 114: Load equipment 20: Lower-level management server 21: Communications Department 22: Management Department 23: Control Unit 30: Upper management server 31: Communications Department 32: Management Department 33: Control Unit 40: Network 50: Power system

Claims

1. Identify the time period that meets the specified conditions, A control unit that creates SOC correction information indicating that the SOC of the storage battery will not be corrected during the specified time period based on the open-circuit voltage of the storage battery, A power management device comprising a communication unit that transmits the SOC correction information to a power storage device or a lower-level power management device.

2. Identify the time period that meets the specified conditions, A control unit that creates SOC correction information indicating that the SOC of the storage battery should be corrected at times other than the specified time period based on the open-circuit voltage of the storage battery, A power management device comprising a communication unit that transmits the SOC correction information to a power storage device or a lower-level power management device.

3. The power management device according to claim 2, wherein the control unit creates SOC correction information indicating the time to perform the correction during time periods other than the aforementioned time period.

4. The power management device according to claim 1 or 2, wherein the lower-level power management device is connected to the energy storage device.

5. The aforementioned communication unit receives power adjustment request information from a higher-level power management device, which indicates the time period or time when adjustment of the power supply and demand balance of the power grid is requested. The power management device according to claim 1 or 2, further comprising the condition that the time period satisfying the aforementioned predetermined conditions is the aforementioned time period or time.

6. The control unit identifies a predicted time period in which adjustment of the power supply and demand balance of the power grid is requested, as transmitted from the higher-level power management device. The power management device according to claim 1 or 2, further comprising the condition that the time period satisfying the aforementioned predetermined conditions is the predicted time period.

7. The control unit calculates a predicted unit price by predicting the unit price of electricity procured from the power grid, The power management device according to claim 1 or 2, wherein the time period in which the above-mentioned predetermined conditions are met is a time period in which the predicted unit price is equal to or greater than a predetermined threshold.

8. The control unit calculates a predicted ambient temperature by predicting the ambient temperature of the battery from the ambient temperature information of the battery's surroundings. The power management device according to claim 1 or 2, wherein the time period in which the above-mentioned predetermined conditions are met is the time period in which the predicted outside temperature is below a predetermined threshold.

9. The communication unit receives sensor information from the energy storage device or the lower-level power management device, which indicates a value obtained from the sensor of the energy storage device. The control unit calculates a measured value of the SOC from the information regarding the charge / discharge current value flowing through the battery included in the sensor information, and an estimated value of the SOC from the open-circuit voltage of the battery included in the sensor information, and determines whether the difference between the measured value of the SOC and the estimated value of the SOC is greater than or equal to a predetermined threshold. The power management device according to claim 1 or 2, wherein the communication unit transmits the SOC correction information to the energy storage device or the lower-level power management device when the control unit determines that the value relating to the difference is equal to or greater than a predetermined threshold.

10. The power management device according to claim 2, wherein the control unit regenerates the SOC correction information if it is deemed that the correction has been performed during the time period between the time period in which the correction was last performed and the time period in which the correction is performed as indicated by the SOC correction information.

11. A power management system comprising a power management device and a higher-level power management device that communicate power information with each other, The above-level power management device includes a control unit that identifies a time period that satisfies predetermined conditions, and a communication unit that transmits specific time period information indicating the time period to the power management device. The power management device comprises a control unit that creates SOC correction information indicating that the SOC of the storage battery will not be corrected during the time period based on the open-circuit voltage of the storage battery, and a communication unit that transmits the SOC correction information to a storage device or a lower-level power management device.

12. A power management system comprising a power management device and a higher-level power management device that communicate power information with each other, The above-level power management device includes a control unit that identifies a time period that satisfies predetermined conditions, and a communication unit that transmits specific time period information indicating the time period to the power management device. The power management device comprises a control unit that creates SOC correction information indicating that the SOC of the storage battery should be corrected at times other than the aforementioned time period based on the open-circuit voltage of the storage battery, and a communication unit that transmits the SOC correction information to a storage device or a lower-level power management device.

13. Equipped with an additional energy storage device, The power management system according to claim 11 or 12, wherein the energy storage device calculates a measured value of the SOC from information regarding the charge / discharge current value flowing through the battery included in sensor information indicating a value obtained from a sensor of the energy storage device, and an estimated value of the SOC from the open-circuit voltage of the battery included in the sensor information, and when it is determined that the difference between the measured value of the SOC and the estimated value of the SOC is greater than or equal to a predetermined threshold, it corrects the SOC of the battery based on the SOC correction information.

14. A step of identifying a time period that satisfies predetermined conditions and creating SOC correction information that indicates that the SOC of the storage battery will not be corrected during that time period based on the open-circuit voltage of the storage battery, A power management method comprising the step of transmitting the SOC correction information to a power storage device or a lower-level power management device.

15. The steps include: identifying a time period that satisfies predetermined conditions and creating SOC correction information that indicates that the SOC of the storage battery should be corrected at a time period other than the specified time period based on the open-circuit voltage of the storage battery; A power management method comprising the step of transmitting the SOC correction information to a power storage device or a lower-level power management device.

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