Power management device and power management method

Abstract

To provide a power management device and a power management method that control distributed power sources installed in a facility such that a difference between a planned value related to the power demand of the facility and an actual value related to the power demand of the facility becomes a predetermined difference or less.SOLUTION: The power management device includes: a management part that manages a facility having a power generation device and a power storage device; and a control part that creates a charge / discharge plan for the power storage device on the basis of the priority of two or more pieces of charge / discharge control for different purposes of use of the power storage device. The two or more pieces of charge / discharge control include at least: first control for securing the storage capacity of the power storage device to suppress the facility's power demand to a predetermined power or less due to discharge from the power storage device in a predetermined time interval and second control for securing the available capacity of the power storage device to charge the power storage device with surplus power from the power generation device.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a power management apparatus and a power management method. [Background technology]

[0002] In recent years, a system using distributed power sources such as power storage devices (hereinafter referred to as VPP (Virtual Power Plant)) has been attracting attention in order to stabilize the balance of power supply and demand in a power grid. In addition, a power management device that manages one or more facilities needs to control the distributed power sources installed in the facilities so that the difference between the planned value for the facility's power demand and the actual value for the facility's power demand is equal to or less than a predetermined difference. In such a system, it is important to appropriately create a charge / discharge plan for the power storage device.

[0003] For example, a method has been proposed for creating a charge / discharge plan for a power storage device, in which a predetermined capacity (hereinafter referred to as BCP capacity) is secured as the storage capacity (remaining storage amount) of the power storage device from the viewpoint of a BCP (Business Continuity Plan), etc. In such a method, the BCP capacity is appropriately estimated, thereby increasing the storage capacity available for purposes other than the BCP (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-191434 Summary of the Invention

[0005] The disclosed power management device includes a management unit that manages a facility having a power generation device and a power storage device, and a control unit that creates a charge / discharge plan for the power storage device based on the priorities of two or more charge / discharge controls for different purposes of use of the power storage device, and the two or more charge / discharge controls include at least a first control that secures the storage capacity of the power storage device in order to suppress the power demand of the facility to below a predetermined power by discharging the power storage device within a predetermined time period, and a second control that secures the available capacity of the power storage device in order to charge the power storage device with surplus power from the power generation device.

[0006] The disclosed power management method includes the steps of managing a facility having a power generation device and a power storage device, and creating a charge / discharge plan for the power storage device based on the priorities of two or more charge / discharge controls for different purposes of use of the power storage device, wherein the two or more charge / discharge controls include at least a first control that secures a storage capacity of the power storage device in order to suppress the power demand of the facility to a predetermined power or less within a predetermined time period, and a second control that secures free capacity of the power storage device in order to charge surplus power from the power generation device into the power storage device. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram showing a power management system 1 according to an embodiment. [Figure 2] FIG. 2 is a diagram showing a facility 100 according to the embodiment. [Figure 3] FIG. 3 is a diagram illustrating a power management server 200 according to the embodiment. [Figure 4] FIG. 4 is a diagram showing the EMS 150 according to the embodiment. [Figure 5] FIG. 5 is a diagram for explaining an outline of the charge / discharge control according to the embodiment. [Figure 6] FIG. 6 is a diagram for explaining the power storage capacity of the power storage device 120 according to the embodiment. [Figure 7] FIG. 7 is a diagram for explaining details of the charge / discharge control according to the embodiment. [Figure 8]FIG. 8 is a diagram illustrating a power management method according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, the drawings are schematic.

[0009] [Embodiment] (Power Management System) The following describes a power management system according to an embodiment. As shown in Fig. 1, the power management system 1 includes a facility 100. The power management system 1 may include a power management server 200 and an external server 300.

[0010] Here, the facility 100, the power management server 200, and the external server 300 are configured to be able to communicate with each other via a network 11. The network 11 may include the Internet, a dedicated line such as a VPN (Virtual Private Network), or a mobile communication network.

[0011] The facility 100 is interconnected with the power grid 12 and may receive power from the power grid 12 or may supply power to the power grid 12. Power from the power grid 12 to the facility 100 may be referred to as forward flow power, purchased power, or demand power. Power from the facility 100 to the power grid 12 may be referred to as reverse flow power or sold power. In FIG. 1 , facilities 100A to 100C are illustrated as examples of the facility 100.

[0012] Although not particularly limited, facility 100 may be a facility such as a residence, a facility such as a store, or a facility such as an office. Facility 100 may also be an apartment building including two or more residences. Facility 100 may also be a complex including at least two or more of the following facilities: a residence, a store, and an office. Details of facility 100 will be described later (see FIG. 2).

[0013] The power management server 200 may be managed by a business operator such as a local power company. The local power company may be a power company operated by a local government or the like. The power management server 200 is a server managed by a business operator such as a power generation business operator, a power transmission and distribution business operator, a retail business operator, or a resource aggregator. The resource aggregator may be a power company that adjusts the power supply and demand balance of the power grid 12 in a VPP (Virtual Power Plant). The adjustment of the power supply and demand balance may include a transaction in which reduced power demand (forward flow power) of the facility 100 is exchanged for value (hereinafter referred to as negawatt trading). The adjustment of the power supply and demand balance may include a transaction in which increased power of reverse flow power is exchanged for value. The resource aggregator may be a power company that provides reverse flow power to a power generation business operator, a power transmission and distribution business operator, a retail business operator, or the like in a VPP.

[0014] The power management server 200 may manage information about power outages in the facility 100 (hereinafter referred to as planned power outage information). The planned power outage information may include information about predetermined planned power outages. The planned power outage information may include information indicating a time period during which the planned power outage will occur.

[0015] The external server 300 is a server that manages various information. For example, the external server 300 is a server that manages weather information. The external server 300 may manage information related to the power generation (output power) of the solar cell device 110 (hereinafter, power generation impact information). The power generation impact information may include weather information, temperature information, humidity information, solar radiation information, etc. The external server 300 may manage information related to power outages in the facility 100 (hereinafter, power generation impact information). The power generation impact information may include disaster information such as heavy rain emergency warnings, flood occurrence information, landslide disaster warning information, flood risk information, heavy rain warnings, flood warnings, flood alert information, heavy rain warning information, and flood advisory information.

[0016] (facility) A facility according to an embodiment will be described below. As shown in Fig. 2, the facility 100 includes a solar cell device 110, a power storage device 120, a fuel cell device 130, a load device 140, and an EMS (Energy Management System) 150. The facility 100 may also include a measuring device 160, a measuring device 161, a measuring device 162, and a measuring device 163.

[0017] The solar cell device 110 is a distributed power source that generates power in response to light such as sunlight. For example, the solar cell device 110 is configured by a PCS (Power Conditioning System) and a solar panel. In the embodiment, the solar cell device 110 may be an example of a power generation device installed in the facility 100.

[0018] The power storage device 120 is a distributed power source that charges and discharges power. For example, the power storage device 120 is configured with a PCS and a power storage cell. In the embodiment, the power storage device 120 may be an example of a power storage device installed in the facility 100.

[0019] The fuel cell device 130 is a distributed power source that generates electricity using fuel. For example, the fuel cell device 130 is composed of a PCS and a fuel cell.

[0020] For example, the fuel cell device 130 may be a solid oxide fuel cell (SOFC; Solid Oxide Fuel Cell), a polymer electrolyte fuel cell (PEFC; Polymer Electrolyte Fuel Cell), a phosphoric acid fuel cell (PAFC; Phosphoric Acid Fuel Cell), or a molten carbonate fuel cell (MCFC; Molten Carbonate Fuel Cell).

[0021] The load device 140 is a device that consumes power. For example, the load device 140 may include a video device, an audio device, a refrigerator, a washing machine, an air conditioner, a personal computer, and the like.

[0022] The EMS 150 manages the power related to the facility 100. The EMS 150 may control the solar cell device 110, the power storage device 120, the fuel cell device 130, and the load devices 140. In the embodiment, the EMS 150 is illustrated as an apparatus that receives control commands from the power management server 200, but such an apparatus may also be referred to as a gateway or simply as a control unit. Details of the EMS 150 will be described later (see FIG. 4).

[0023] The measuring device 160 measures forward flow power from the power system 12 to the facility 100. The measuring device 160 may also measure reverse flow power from the facility 100 to the power system 12. For example, the measuring device 160 may be a smart meter belonging to a power company. The measuring device 160 may transmit an information element indicating a measurement result (an integrated value of forward flow power or reverse flow power) at a first interval (e.g., 30 minutes) to the EMS 150 at the first interval. The measuring device 160 may also transmit an information element indicating a measurement result at a second interval (e.g., 1 minute) that is shorter than the first interval to the EMS 150.

[0024] The measuring device 161 measures the output power (generated power) of the solar cell device 110. The measuring device 161 may transmit an information element indicating the measurement result at a second interval (for example, one minute) shorter than the first interval to the EMS 150 at each second interval. The measurement result may be represented by an instantaneous value or an integrated value.

[0025] The measuring device 162 measures the charging power and discharging power of the power storage device 120. The measuring device 162 may transmit an information element indicating the measurement result at a second interval (e.g., one minute) shorter than the first interval to the EMS 150 at each second interval. The measurement result may be represented by an instantaneous value or an integrated value.

[0026] The measuring device 163 measures the output power (generated power) of the fuel cell device 130. The measuring device 163 may transmit an information element indicating the measurement result at a second interval (for example, one minute) shorter than the first interval to the EMS 150 at each second interval. The measurement result may be represented by an instantaneous value or an integrated value.

[0027] (Power management server) The power management server will be described below. As shown in Fig. 3, the power management server 200 includes a management unit 210, a communication unit 220, and a control unit 230. In the embodiment, the power management server 200 is an example of a power management device. The power management server 200 can communicate with the facility 100 via the network 11, and may be considered to be a server operating on the cloud.

[0028] The management unit 210 is configured with a storage medium such as an SSD (Solid State Drive), an HDD (Hard Disk Drive), or a nonvolatile semiconductor memory, and manages information related to the facility 100. For example, the information related to the facility 100 includes the type of distributed power source (solar cell device 110, power storage device 120, or fuel cell device 130) installed in the facility 100, and the specifications of the distributed power source installed in the facility 100. The specifications may include the rated power generation power of the solar cell device 110, the rated charge / discharge power of the power storage device 120, and the rated output power of the fuel cell device 130. The specifications may also include the rated capacity and maximum charge / discharge power of the power storage device 120.

[0029] In the embodiment, the management unit 210 is an example of a management unit that manages the facility 100 that has a power generation device (for example, the solar cell device 110) and a power storage device 120.

[0030] The communication unit 220 is configured by a communication module, and communicates with the local control device 360 ​​via the network 11. The communication module may be a wireless communication module conforming to standards such as IEEE802.11a / b / g / n / ac / ax, ZigBee, Wi-SUN, LTE, 5G, or 6G, or may be a wired communication module conforming to standards such as IEEE802.3.

[0031] In the embodiment, the communication unit 220 transmits the control command to the EMS 150. The control command is transmitted in accordance with a charge / discharge plan created by the control unit 230, which will be described later.

[0032] The control unit 230 may include at least one processor. The at least one processor may be configured by a single integrated circuit (IC), or may be configured by multiple circuits (such as integrated circuits and / or discrete circuits) that are communicatively connected.

[0033] In the embodiment, the control unit 230 is an example of a control unit that creates a charge / discharge plan for the power storage device based on the priorities of two or more charge / discharge controls for different purposes of use of the power storage device 120.

[0034] The two or more charge / discharge controls include at least a first control for ensuring the storage capacity of the power storage device 120 in order to suppress the power demand of the facility 100 to a predetermined power level or less by discharging the power storage device 120 in a predetermined time interval, and a second control for ensuring the available capacity of the power storage device in order to charge the power storage device 120 with surplus power from the power generation device. The predetermined time interval may be, for example, a time interval of 30 minutes. Details of the charge / discharge controls will be described later.

[0035] (EMS) The EMS according to the embodiment will be described below. As shown in FIG.

[0036] The first communication unit 151 is configured by a communication module. The communication module may be a wireless communication module conforming to standards such as IEEE802.11a / b / g / n / ac / ax, ZigBee, Wi-SUN, LTE, 5G, or 6G, or may be a wired communication module conforming to standards such as IEEE802.3 or a proprietary protocol.

[0037] The first communication unit 151 may communicate with the power management server 200 via the network 11. The first communication unit 151 may communicate with the external server 300 via the network 11.

[0038] The second communication unit 152 is configured by a communication module. The communication module may be a wireless communication module conforming to standards such as IEEE802.11a / b / g / n / ac / ax, ZigBee, Wi-SUN, LTE, 5G, or 6G, or may be a wired communication module conforming to standards such as IEEE802.3 or a proprietary protocol.

[0039] The second communication unit 152 may communicate with the solar cell device 110 and the power storage device 120. Although signal lines are omitted in FIG. 2 , the second communication unit 152 may communicate with the load device 140, and may communicate with the measuring device 160, the measuring device 161, the measuring device 162, and the measuring device 163.

[0040] The control unit 153 controls the EMS 150. The control unit 153 may include at least one processor. The at least one processor may be configured by a single integrated circuit (IC), or may be configured by two or more circuits (such as integrated circuits and / or discrete circuits) that are communicatively connected.

[0041] The control unit 153 may control the solar cell device 110, the power storage device 120, and the fuel cell device 130. The control unit 153 may also control the load device 140. For example, the control unit 153 controls charging and discharging of the power storage device 120 based on a control command received from the power management server 200. The control command is transmitted from the power management server 200 in accordance with a charging and discharging plan created by the power management server 200.

[0042] (Charge / discharge control overview) An outline of the charge / discharge control according to the embodiment will be described below. The charge / discharge control includes two or more charge / discharge controls for different purposes of use of the power storage device 120. Here, an outline of the charge / discharge plan will be described using as an example a case where a charge / discharge plan is created for a target section (for example, one day from 0:00 to 24:00).

[0043] As shown in FIG. 5, charge / discharge control for different purposes of use of the power storage device 120 includes peak shaving, surplus charging, remaining capacity adjustment, nighttime discharge, planned interpolation, and the like.

[0044] Peak shaving is control (discharge control) that suppresses the power demand of facility 100 to a predetermined power level or less during a predetermined time period by discharging power from power storage device 120. Peak shaving can be performed during a time period (e.g., 8:30-16:30) when the power consumption of facility 100 (e.g., the power consumption of load devices 140) is expected to exceed the predetermined power level.

[0045] Surplus charging is control (charging control) for charging surplus power from the power generation device to the power storage device 120. For example, surplus power is power obtained by subtracting power consumption by the facility 100 (for example, power consumption by the load devices 140) from the output power of the solar cell device 110. Surplus charging can be performed during a time period (for example, 5:00-19:00) when it is expected that the output power of the solar cell device 110 can be obtained.

[0046] The remaining power adjustment is a control for adjusting the remaining amount of stored power in the power storage device 120. For example, the remaining power adjustment may include control for discharging the power storage device 120 before the time (e.g., 5:00) when an excess of surplus power is predicted based on the predicted value of surplus power. The remaining power adjustment may include control for charging the power storage device 120 before the time (e.g., 5:00) when a shortage of surplus power is predicted based on the predicted value of surplus power. The remaining power adjustment may be performed during a time period (e.g., 0:00-5:00) suitable for adjusting the remaining amount of stored power in the power storage device 120.

[0047] Here, the surplus power may be identified by the difference between the predicted value of the output power of the solar cell device 110 and the predicted value of the power consumption of the facility 100. An excess of surplus power may mean that the surplus power cannot be charged to the power storage device 120 during a time period when surplus charging can be performed. A shortage of surplus power may mean that the power storage device 120 cannot discharge enough power to suppress the power demand of the facility 100 to a predetermined power or less during a time period when peak cutting can be performed. The power demand of the facility 100 is the power obtained by subtracting the output power of the solar cell device 110 from the power consumption of the facility 100 (for example, the power consumption of the load devices 140).

[0048] As described above, the remaining capacity adjustment includes control to ensure the storage capacity of the power storage device 120 for peak shaving. In other words, the remaining capacity adjustment is an example of first control to ensure the storage capacity of the power storage device 120 in order to suppress the power demand of the facility 100 to a predetermined power level or less by discharging the power storage device 120 in a predetermined time interval. The remaining capacity adjustment includes control to ensure the available capacity of the power storage device 120 for surplus charging. In other words, the remaining capacity adjustment is an example of second control to ensure the available capacity of the power storage device in order to charge the power storage device 120 with surplus power from the power generation device.

[0049] Nighttime discharge is a control to discharge the power storage device 120 when the predicted value of the price of purchased power is expected to be higher than a threshold value. The threshold value may be determined by a user. Nighttime discharge can be performed during a time period suitable for discharging the power storage device 120 (e.g., 15:30-22:30).

[0050] Plan interpolation is control that interpolates a charge / discharge plan for the power storage device 120. For example, plan interpolation is control that charges / discharges the power storage device 120 when peak shaving, surplus charging, and nighttime discharging are not performed. Plan interpolation can be performed in a target section (e.g., a day from 0:00 to 24:00) for which a charge / discharge plan is created.

[0051] As shown in Fig. 6, the capacity of the power storage device 120 may include a first capacity and a second capacity. The first capacity is a capacity related to the power discharged by peak shaving. In other words, the first capacity is a storage capacity secured by the first control. The second capacity is a capacity related to the power charged by surplus charging. In other words, the second capacity is a free capacity secured by the second control.

[0052] 6, the capacity of the power storage device 120 may include a capacity related to power to be used in an emergency (hereinafter referred to as a BCP (Business Continuity Plan) capacity) in addition to the first capacity and the second capacity. An emergency is a disconnection state (for example, a power outage state) in which the facility 100 is disconnected from the power grid 12.

[0053] (Details of charge / discharge control) The details of the charge / discharge control according to the embodiment will be described below. Here, an overview of the charge / discharge plan will be described using an example in which a charge / discharge plan is created for a target section (for example, a day from 0:00 to 24:00). Furthermore, the power management server 200 may create a charge / discharge plan for the power storage device 120 at a first timing, and correct the charge / discharge plan for the power storage device 120 at a second timing that is later than the first timing. For example, the first timing may be 6:00 on the day before the target section. The second timing may be immediately before the target section, or may be during the target section.

[0054] As shown in FIG. 7, the charge / discharge control for different purposes of use of the power storage device 120 includes the above-mentioned peak cut, surplus charging, remaining capacity adjustment, nighttime discharge, planned interpolation, as well as start / stop, control plan change, post-power outage measures, pre-power outage measures, imbalance adjustment, etc.

[0055] The start / stop includes control to start the power storage device 120 and control to stop the power storage device 120. The start / stop is performed manually in the target section.

[0056] The control plan change is a control for changing the charge / discharge plan for the power storage device 120. The control plan change is executed manually in the target section.

[0057] The post-power outage countermeasures include control to discharge the power storage device 120 in an emergency such as a power outage. The post-power outage countermeasures may include control to charge the power storage device 120 with surplus power if there is surplus power in an emergency. The post-power outage countermeasures are executed in real time when an emergency such as a power outage occurs. The power outage may include a planned power outage. The post-power outage countermeasures may be executed using BCP capacity.

[0058] The pre-power outage countermeasures are controls for charging the power storage device 120 to ensure BCP capacity. The BCP capacity may be determined based on the length of the power outage and the predicted value of the power consumption of the facility 100 during the power outage. The BCP capacity may be determined in advance. The pre-power outage countermeasures are an example of a third control for ensuring the storage capacity of the power storage device 120 to discharge power to be used in an emergency. The pre-power outage countermeasures are executed in real time before an emergency such as a power outage occurs.

[0059] The imbalance adjustment is a control for reducing the difference between the planned value and the actual value for the power demand of the facility 100. The imbalance adjustment is an example of a fourth control for ensuring at least one of the storage capacity and the available capacity of the power storage device 120 in order to suppress the deviation of the power demand of the facility 100 from the planned value to a threshold value or less. The imbalance adjustment is performed in real time in the target section.

[0060] As described above, peak shaving is control (discharge control) that suppresses the power demand of the facility 100 to a predetermined power level or less by discharging the power storage device 120 during a predetermined time interval. A peak shaving plan may be created the day before the target interval (for example, the first timing described above). The peak shaving plan may be corrected at a timing (for example, the second timing described above) that is a predetermined time (for example, 3 hours) before the unit time (for example, 30 minutes) when peak shaving is expected to be necessary.

[0061] As described above, remaining power adjustment is a control for adjusting the remaining amount of stored power in the power storage device 120. The remaining power adjustment may include a first control for peak cutting, or a second control for surplus charging. The remaining power adjustment plan may be created the day before the target section (for example, the first timing described above). The remaining power adjustment plan may be corrected at a timing (for example, the second timing described above) that is a predetermined time (for example, 3 hours) before the unit time (for example, 30 minutes) when it is expected that remaining power adjustment will be necessary.

[0062] As described above, nighttime discharge is a control to discharge the energy storage device 120 when the predicted value of the price of purchased power is expected to be higher than a threshold value. The nighttime discharge plan may be created the day before the target section (for example, the first timing described above). The nighttime discharge plan may be corrected at a timing (for example, the second timing described above) that is a predetermined time (for example, 3 hours) before the unit time (for example, 30 minutes) when nighttime discharge is expected to be necessary.

[0063] As described above, the planned interpolation is a control that interpolates the charge / discharge plan of the power storage device 120. The planned interpolation plan may be created the day before the target section (for example, the first timing described above). The planned interpolation plan may be corrected at a timing (for example, the second timing described above) that is a predetermined time (for example, 3 hours) before the unit time (for example, 30 minutes) when the planned interpolation is expected to be necessary.

[0064] Here, the priority of each charge / discharge control is set to A to F. In Fig. 7, the priority is illustrated in the order of A → B → C → D → E → F. That is, A has the highest priority and F has the lowest priority.

[0065] Under these circumstances, the power management server 200 creates a charge / discharge plan for the power storage device 120 based on a predicted value of the output power of the solar cell device 110 and a predicted value of the power consumption of the facility 100. Furthermore, the power management server 200 creates a charge / discharge plan for the power storage device 120 based on the priority of each charge / discharge control. The power management server 200 may create a charge / discharge plan for the power storage device 120 at a first timing, and correct the charge / discharge plan for the power storage device 120 at a second timing that is later than the first timing. The power management server 200 may divide the target section into unit times (e.g., 30 minutes), and create and correct a charge / discharge plan for each unit time.

[0066] The priorities of peak cutting, remaining amount adjustment (first control), and remaining amount adjustment (second control) are all C (or E), but these charge / discharge controls may have the following priorities. For example, the priority of peak cutting may be higher than the priorities of remaining amount adjustment (first control) and remaining amount adjustment (second control). The priority of remaining amount adjustment (first control) may be the same as the priority of remaining amount adjustment (second control), or may be higher than the priority of remaining amount adjustment (second control), or may be lower than the priority of remaining amount adjustment (second control).

[0067] The priority of the remaining amount adjustment (first control) and the priority of the remaining amount adjustment (second control) may be determined based on the value generated by suppressing the power demand of the facility 100 and the value of surplus power of the power generation device.

[0068] The value generated by suppressing the power demand of the facility 100 is the value obtained by peak shaving. The value obtained by peak shaving is defined by the amount of loss that occurs when the power demand of the facility 100 exceeds a predetermined amount of power. In other words, the value obtained by peak shaving is greater the smaller the amount of loss.

[0069] The value of surplus power of a power generation device is the value obtained by surplus charging. The value obtained by surplus charging may be the difference between the price of purchased power suppressed by surplus charging and the price of power sold from the surplus power in the case where surplus charging was not performed. In such a case, if the price of purchased power is lower than the price of power sold, it is advantageous to perform reverse power flow of the surplus power, so surplus charging does not need to be performed, and remaining power adjustment (second control) does not need to be performed either. In other words, the remaining power adjustment (second control) may have the lowest priority.

[0070] If the power generation device is a solar cell device 110, the value obtained by surplus charging may be environmental value. The environmental value may be value obtained in a trading market for CO2 emissions (rights). If the environmental value is given priority, the priority of the remaining amount adjustment (second control) may be higher than the remaining amount adjustment (first control).

[0071] Furthermore, the priority of charge / discharge control assumed at the second timing (e.g., the current day) may be higher than the priority of charge / discharge control assumed at the first timing (e.g., the previous day). That is, the priority of peak cut, remaining amount adjustment (first control), remaining amount adjustment (second control), nighttime discharge, and planned interpolation assumed on the previous day may be higher than the priority of peak cut, remaining amount adjustment (first control), remaining amount adjustment (second control), nighttime discharge, and planned interpolation assumed on the current day.

[0072] Although Fig. 7 does not mention the priority of surplus charging, it is assumed that surplus charging will be performed if there is available capacity in the power storage device 120 and surplus power. Although not particularly limited, the priority of surplus charging may be C, similar to peak shaving. It should be noted that surplus charging is not performed simultaneously with peak shaving.

[0073] (Power management method) A power management method according to an embodiment will be described below.

[0074] As shown in FIG. 8 , in step S10, the power management server 200 may receive an actual value of the power demand or power consumption of the facility 100 from the facility 100 (e.g., the measuring device 160). The power management server 200 may receive an actual value of the output power of the solar cell device 110 from the facility 100. The power management server 200 may receive a predicted value of the power demand or power consumption of the facility 100 from the facility 100 (e.g., the measuring device 160). The power management server 200 may receive a predicted value of the output power of the solar cell device 110 from the facility 100. The power management server 200 may receive power generation impact information, power outage impact information, etc. from the external server 300.

[0075] In step S12, the power management server 200 creates a charge / discharge plan for the power storage device 120 based on the predicted value of the output power of the solar cell device 110 and the predicted value of the power consumption of the facility 100. The priority of each charge / discharge control is used in creating the charge / discharge plan for the power storage device 120. Step S12 is an example of the first timing.

[0076] In step S14, the power management server 200 transmits a control command to the facility 100 in accordance with the charge / discharge plan created in step S12. The control command may be transmitted for each target section, or may be transmitted for each unit time included in the target section.

[0077] In FIG. 8, the processes of steps S10 to S14 may be considered to be processes executed before the target section.

[0078] In step S20, the power management server 200 may receive an actual value of the power demand or power consumption of the facility 100 from the facility 100 (for example, the measuring device 160). The power management server 200 may receive an actual value of the output power of the solar cell device 110 from the facility 100. The power management server 200 may receive the latest information on the predicted value of the power demand or power consumption of the facility 100 from the facility 100. The power management server 200 may receive the latest information on the predicted value of the output power of the solar cell device 110 from the facility 100. The power management server 200 may receive the latest information on the power generation impact information, power outage impact information, etc. from the external server 300.

[0079] In step S22, the power management server 200 corrects the charge and discharge plan for the power storage device 120 based on the actual value of the output power of the solar cell device 110 and the actual value of the power consumption of the facility 100. The power management server 200 may correct the charge and discharge plan for the power storage device 120 based on the latest information on the predicted value of the output power of the solar cell device 110 and the latest information on the predicted value of the power consumption of the facility 100. The correction of the charge and discharge plan for the power storage device 120 uses the priority of each charge and discharge control. Step S22 is an example of the second timing.

[0080] In step S24, the power management server 200 transmits a control command to the facility 100 in accordance with the charge / discharge plan corrected in step S22. The control command may be transmitted for each target section, or may be transmitted for each unit time included in the target section.

[0081] In FIG. 8, the processes of steps S20 to S24 may be considered to be processes executed during the target section.

[0082] (Action and effect) In the embodiment, the power management server 200 creates a charge / discharge plan for the power storage device 120 based on the priorities of two or more charge / discharge controls for different purposes of use of the power storage device 120. The priorities of the two or more charge / discharge controls include a first control for peak shaving and a second control for surplus charging. With this configuration, although peak shaving and surplus charging are not performed simultaneously, there is a possibility that the controls for preparing for them (the first control and the second control) may conflict with each other. Therefore, by setting the priorities, it is possible to appropriately create a charge / discharge plan for the power storage device 120.

[0083] [Other embodiments] Although the present invention has been described by the above-mentioned embodiments, the descriptions and drawings that form part of this disclosure should not be understood to limit the present invention. From this disclosure, various alternative embodiments, examples, and operating techniques will become apparent to those skilled in the art.

[0084] In the above disclosure, "creation" and "amendment" are used as different terms, but since the difference is only in timing, "amendment" may be read as "creation." "Creation" and "amendment" may be read as "formulation."

[0085] In the above disclosure, the first control does not include peak cutting, but the first control may be a concept that includes peak cutting.

[0086] In the above disclosure, the second control does not include surplus charging, but the second control may be a concept that includes surplus charging.

[0087] In the above disclosure, a case has been exemplified in which charge / discharge control of the power storage device 120 is executed based on a control command received from the power management server 200. However, the embodiment is not limited to this. The charge / discharge control of the power storage device 120 may be autonomously executed by the EMS 150. For example, the imbalance adjustment may be autonomously executed by the EMS 150 at a second cycle (e.g., every minute).

[0088] Although not specifically mentioned in the above disclosure, the predicted value of the power demand of the facility 100 may be predicted by learning from past power demands. The learning may include time periods, days of the week, seasons, and weather (solar radiation, temperature, humidity, etc.) in addition to past power demands. The learning may be machine learning or deep learning, such as AI (artificial intelligence).

[0089] Although not specifically mentioned in the above disclosure, the predicted value of the output power of the solar cell device 110 may be predicted by learning past output power. The learning may include time of day, day of the week, season, weather (amount of solar radiation, temperature, humidity, etc.) in addition to past power demand. The learning may be machine learning or deep learning represented by AI.

[0090] In the above disclosure, the power management server 200 is used as an example of a power management apparatus. However, the above disclosure is not limited to this. The power management apparatus may be the EMS 150.

[0091] Although not specifically mentioned in the above disclosure, the output power of the fuel cell device 130 may be taken into consideration when creating a charge / discharge plan for the power storage device 120. If a reverse power flow of the output power of the fuel cell device 130 is recognized, the fuel cell device 130 may be treated as a power generation device in the same way as the solar cell device 110. The output power of the fuel cell device 130 may be assumed to be the rated output power.

[0092] In the above disclosure, the case where the power generation device installed in the facility 100 is the solar cell device 110 has been exemplified. However, the embodiment is not limited to this. The power generation device may be one or more power generation devices selected from a fuel cell device, a wind power generation device, a hydroelectric power generation device, a geothermal power generation device, and a biomass power generation device.

[0093] In the above disclosure, the EMS 150 is provided in the facility 100. However, the above disclosure is not limited to this. The EMS 150 may be provided by a cloud service implemented by a server or the like provided on the network 11.

[0094] Although not specifically mentioned in the above disclosure, power may be an instantaneous value (W / kW) or an integrated value per unit time (Wh / kWh).

[0095] The above disclosure may have the following problems and effects.

[0096] Specifically, there are various purposes for using a power storage device other than BCP, such as charging the power storage device with surplus power from a power generation device such as a solar cell device (hereinafter referred to as surplus charging purpose), discharging power from the power storage device to suppress peak power for a predetermined time period (e.g., 30 minutes) to a threshold or less (hereinafter referred to as peak cutting purpose), and so on.

[0097] In such a case, in order to achieve the surplus charging objective, it is necessary to secure in advance available capacity for charging the surplus power, while in order to achieve the peak cutting objective, it is necessary to secure in advance storage capacity (which, as mentioned above, may also be referred to as remaining storage capacity) by charging the power required to suppress peak power into the storage device.

[0098] As a result of careful consideration considering the above-mentioned cases, the inventors noticed that two or more charge / discharge controls for different purposes are in conflict with each other, and discovered the need to appropriately create a charge / discharge plan for the storage device taking into account two or more charge / discharge controls.

[0099] According to the above disclosure, it is possible to provide a power management device and a power management method that enable appropriate creation of a charge / discharge plan for a power storage device. [Explanation of symbols]

[0100] 1...power management system, 11...network, 12...power system, 100...facility, 110...solar cell device, 120...power storage device, 130...fuel cell device, 140...load equipment, 150...EMS, 151...first communication unit, 152...second communication unit, 153...control unit, 160...measuring device, 161...measuring device, 162...measuring device, 163...measuring device, 200...power management server, 210...management unit, 220...communication unit, 230...control unit, 300...external server

Claims

1. a management unit that manages a facility having a power generation device and a power storage device; a control unit that creates a charge / discharge plan for the power storage device based on priorities of two or more charge / discharge controls for different purposes of use of the power storage device, The two or more charge / discharge controls include at least a first control that ensures a storage capacity of the storage device in order to suppress the power demand of the facility to a predetermined power level or less by discharging the storage device during a predetermined time period, and a second control that ensures free capacity of the storage device in order to charge the storage device with surplus power from the power generation device.

2. The power management device according to claim 1 , wherein the priority of the first control and the second control is determined based on a value generated by suppressing the power demand of the facility and a value of surplus power of the power generation device.

3. The power management apparatus according to claim 1 , wherein the priority of the first control is higher than the priority of the second control.

4. the control unit creates a charge / discharge plan for the power storage device at a first timing and corrects the charge / discharge plan for the power storage device at a second timing that is later than the first timing; The power management device according to claim 1 , wherein a priority of the charge / discharge control assumed at the second timing is higher than a priority of the charge / discharge control assumed at the first timing.

5. The power management device according to claim 1 , wherein the first control includes control for suppressing the power demand of the facility to a predetermined power level or less by discharging the power storage device during the predetermined time period.

6. The power management device according to claim 1 , wherein the second control includes control of charging the power storage device with surplus power from the power generation device.

7. 7. The power management device according to claim 1, wherein the two or more charge / discharge controls include at least one of a third control that secures the storage capacity of the power storage device in order to discharge power to be used in an emergency, and a fourth control that secures at least one of the storage capacity and available capacity of the power storage device in order to suppress deviation from a planned value for the power demand of the facility to below a threshold value.

8. Managing a facility having a power generation device and a power storage device; creating a charge / discharge plan for the power storage device based on priorities of two or more charge / discharge controls for different purposes of use of the power storage device; The two or more charge / discharge controls include at least a first control that ensures a storage capacity of the power storage device in order to suppress the power demand of the facility to a predetermined power or less within a predetermined time period, and a second control that ensures free capacity of the power storage device in order to charge surplus power of the power generation device into the power storage device.

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