Power management device and power management method

Abstract

This power management device comprises: a management unit that manages a facility having a power generation device and a power storage device; and a control unit that creates charge and discharge plans for the power storage device, on the basis of priorities of two or more charge and discharge controls for different purposes of use of the power storage device. The two or more charge and discharge controls include at least a first control that ensures a power storage capacity of the power storage device so as to control a power demand of the facility to be equal to or lower than predetermined power by a discharge of the power storage device in a predetermined time period, and a second control that ensures a free capacity of the power storage device so as to charge excess power of the power generation device to the power storage device.

Description

Technical Field

[0001] The present invention relates to a power management device and a power management method.

Background Art

[0002] In recent years, in order to stabilize the power supply-demand balance of the power system, a mechanism using distributed power sources such as energy storage devices (hereinafter, VPP (Virtual Power Plant)) has attracted attention. 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 of the demand power of the facilities and the actual value of the demand power of the facilities is within a predetermined difference. In such a mechanism, it is important to appropriately create a charge-discharge plan for the energy storage device.

[0003] For example, as a method for creating a charge-discharge plan for an energy storage device, a method has been proposed in which a charge-discharge plan for the energy storage device is created while securing a predetermined capacity (hereinafter, BCP capacity) as the storage capacity (remaining storage amount) of the energy storage device from the perspective of BCP (Business Continuity Plan). In such a method, by appropriately estimating the BCP capacity, an increase in the storage capacity available for purposes other than BCP is aimed at (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

[0005] The disclosed power management device comprises a management unit for managing a facility having a power generation device and a power storage device, and a control unit for creating a charge / discharge plan for the power storage device based on the priority 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 the storage capacity of the power storage device in order to suppress the facility's power demand to a predetermined level or less by discharging the power storage device during a predetermined time interval, 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 power management method disclosed comprises 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 priority 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 the storage capacity of the power storage device in order to suppress the power demand of the facility to a predetermined power or less over a predetermined time interval; 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. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 shows a power management system 1 according to an embodiment. [Figure 2] Figure 2 shows a facility 100 according to an embodiment. [Figure 3] Figure 3 shows a power management server 200 according to an embodiment. [Figure 4] Figure 4 shows an EMS150 according to an embodiment. [Figure 5] Figure 5 is a diagram illustrating the overview of the charge / discharge control according to the embodiment. [Figure 6] Figure 6 is a diagram illustrating the energy storage capacity of the energy storage device 120 according to this embodiment. [Figure 7] Figure 7 is a diagram illustrating the details of the charge / discharge control according to the embodiment. [Figure 8]Figure 8 shows a power management method according to an embodiment. [Modes for carrying out the invention]

[0008] Embodiments will be described below with reference to the drawings. In the following drawings, identical 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 Figure 1, the power management system 1 has a facility 100. The power management system 1 may also include a power management server 200 and an external server 300.

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

[0011] Facility 100 is connected to 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 facility 100 may be called power flow, purchased power, or demanded power. Power from facility 100 to the power grid 12 may be called power flow in reverse or power sold. In Figure 1, facilities 100A to 100C are shown as examples of facility 100.

[0012] While not particularly limited, facility 100 may be a residential building, a shop, or an office. Facility 100 may be a multi-unit dwelling containing two or more residences. Facility 100 may be a mixed-use complex containing at least two of the following types of facilities: residences, shops, and offices. Details of facility 100 will be described later (see Figure 2).

[0013] The power management server 200 may be managed by a business operator such as a regional power company. The regional 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 generator, a transmission and distribution company, a retail company, 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 transactions (hereinafter referred to as negawatt transactions) in which the reduced power of the demand power (power flow) of facility 100 is exchanged for value. The adjustment of the power supply and demand balance may also include transactions in which the increased power of reverse power flow is exchanged for value. The resource aggregator may be a power company that provides reverse power flow to power generators, transmission and distribution companies, and retail companies in a VPP.

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

[0015] External server 300 is a server that manages various types of information. For example, external server 300 is a server that manages weather information. External server 300 may also manage information regarding the power generated (output power) of the solar cell equipment 110 (hereinafter referred to as power generation impact information). Power generation impact information may include weather information, temperature information, humidity information, solar radiation information, etc. External server 300 may also manage information regarding power outages at facility 100 (hereinafter referred to as power outage impact information). Power outage impact information may include disaster information such as heavy rain special warnings, flood occurrence information, landslide disaster warning information, flood risk information, heavy rain warnings, flood warnings, flood warning information, flood advisory information, heavy rain advisory information, and flood advisory information.

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

[0017] The solar power generation device 110 is a distributed power source that generates electricity in response to light such as sunlight. For example, the solar power generation device 110 is composed of a PCS (Power Conditioning System) and solar panels. In the embodiment, the solar power generation 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 electric power. For example, the power storage device 120 is composed of a PCS and storage cells. 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 fuel cells.

[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 equipment 140 is equipment that consumes electric power. For example, the load equipment 140 may include video equipment, audio equipment, refrigerators, washing machines, air conditioners, personal computers, and the like.

[0022] The EMS150 manages the power supply for the facility 100. The EMS150 may also control the solar cell system 110, the energy storage system 120, the fuel cell system 130, and the load equipment 140. In this embodiment, the EMS150 is exemplified as a device that receives control commands from the power management server 200, but such a device may also be called a Gateway or simply a control unit. Details of the EMS150 will be described later (see Figure 4).

[0023] The measuring device 160 measures the power flow from the power system 12 to the facility 100. The measuring device 160 may also measure the reverse power flow 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 information elements indicating the measurement results (integral value of power flow or reverse power flow) for each first interval (e.g., 30 minutes). The measuring device 160 may also transmit information elements indicating the measurement results for a second interval (e.g., 1 minute) 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 information elements indicating the measurement results at a second interval (e.g., 1 minute) shorter than the first interval to the EMS 150 at each second interval. The measurement results may be expressed as instantaneous values ​​or as integrated values.

[0025] The measuring device 162 measures the charging power and discharging power of the energy storage device 120. The measuring device 162 may transmit information elements indicating the measurement results for a second interval (e.g., 1 minute) shorter than the first interval to the EMS 150 at each second interval. The measurement results may be expressed as instantaneous values ​​or as integrated values.

[0026] The measuring device 163 measures the output power (generated power) of the fuel cell device 130. The measuring device 163 may transmit information elements indicating the measurement results at a second interval (e.g., 1 minute) shorter than the first interval to the EMS 150 at each second interval. The measurement results may be expressed as instantaneous values ​​or as integrated values.

[0027] (Power management server) The power management server will be described below. As shown in Figure 3, the power management server 200 includes a management unit 210, a communication unit 220, and a control unit 230. In this 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 can be considered as a server operating on the cloud.

[0028] The management unit 210 is composed of storage media such as SSDs (Solid State Drives), HDDs (Hard Disk Drives), and non-volatile semiconductor memory, and manages information related to facility 100. For example, information related to facility 100 includes the type of distributed power source (solar cell system 110, energy storage system 120, or fuel cell system 130) installed in facility 100, and the specifications of the distributed power source installed in facility 100. The specifications may also include the rated power generation of the solar cell system 110, the rated charge / discharge power of the energy storage system 120, and the rated output power of the fuel cell system 130. The specifications may also include the rated capacity and maximum charge / discharge power of the energy storage system 120.

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

[0030] The communication unit 220 is composed of a communication module and communicates with the local control unit 360 via the network 11. The communication module may be a wireless communication module compliant with standards such as IEEE 802.11a / b / g / n / ac / ax, ZigBee, Wi-SUN, LTE, 5G, or 6G, or it may be a wired communication module compliant with standards such as IEEE 802.3.

[0031] In this embodiment, the communication unit 220 transmits a control command to the EMS 150. The control command is created by the control unit 230, which will be described later. ru It will be transmitted according to the charge / discharge schedule.

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

[0033] In this embodiment, the control unit 230 is an example of a control unit that creates a charge-discharge plan for the energy storage device 120 based on two or more charge-discharge control priorities for different intended uses of the energy storage device 120.

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

[0035] (EMS) The following describes an EMS according to an embodiment. As shown in Figure 4, the EMS 150 includes a first communication unit 151, a second communication unit 152, and a control unit 153.

[0036] The first communication unit 151 is comprised of a communication module. The communication module may be a wireless communication module compliant with standards such as IEEE 802.11a / b / g / n / ac / ax, ZigBee, Wi-SUN, LTE, 5G, or 6G, or it may be a wired communication module compliant with standards such as IEEE 802.3 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 also communicate with the external server 300 via the network 11.

[0038] The second communication unit 152 is comprised of a communication module. The communication module may be a wireless communication module compliant with standards such as IEEE 802.11a / b / g / n / ac / ax, ZigBee, Wi-SUN, LTE, 5G, or 6G, or it may be a wired communication module compliant with standards such as IEEE 802.3 or a proprietary protocol.

[0039] The second communication unit 152 may communicate with the solar cell device 110 and the energy storage device 120. Although the signal lines are omitted in Figure 2, the second communication unit 152 may also communicate with the load device 140, and may also communicate with the measuring devices 160, 161, 162, and 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 consist of a single integrated circuit (IC) or two or more circuits (such as integrated circuits and / or discrete circuits) that are communicated together.

[0041] The control unit 153 may control the solar cell device 110, the energy storage device 120, and the fuel cell device 130. The control unit 153 may also control the load equipment 140. For example, the control unit 153 controls the charging and discharging of the energy storage device 120 based on control commands received from the power management server 200. The control commands are sent from the power management server 200 according to the charge and discharge plan created by the power management server 200.

[0042] (Overview of charge / discharge control) The following describes an overview of the charge-discharge control according to the embodiment. The charge-discharge control includes two or more charge-discharge controls for different purposes of use of the energy storage device 120. Here, we will describe the overview of the charge-discharge plan using as an example a case in which a charge-discharge plan is created for a target period (for example, one day from 0:00 to 24:00).

[0043] As shown in Figure 5, charge and discharge control for the energy storage device 120 for each of its different purposes includes peak cutting, excess charging, remaining charge adjustment, nighttime discharge, and planned interpolation.

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

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

[0046] Battery level adjustment is a control that adjusts the remaining charge of the energy storage device 120. For example, if an excess of surplus power is expected based on a predicted value of surplus power, the battery level adjustment may include a control that discharges the energy storage device 120 before the time when surplus charging is expected to begin (e.g., 5:00). If a shortage of surplus power is expected based on a predicted value of surplus power, the battery level adjustment may include a control that charges the energy storage device 120 before the time when surplus charging is expected to begin (e.g., 5:00). Battery level adjustment may be performed during a time period suitable for adjusting the remaining charge of the energy storage device 120 (e.g., 0:00-5:00).

[0047] Here, surplus power may be identified by the difference between the predicted output power of the solar cell system 110 and the predicted power consumption of the facility 100. An excess of surplus power may mean that surplus power cannot be charged into the energy storage device 120 during the time period when surplus charging may be performed. A shortage of surplus power may mean that power cannot be discharged from the energy storage device 120 to reduce the power demand of the facility 100 to below a predetermined power level during the time period when peak shaving may be performed. The power demand of the facility 100 is the power consumed by the facility 100 (for example, the power consumption of the load equipment 140) minus the output power of the solar cell system 110.

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

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

[0050] Plan interpolation is a control that interpolates the charge and discharge plan of the energy storage device 120. For example, plan interpolation is a control that charges and discharges the energy storage device 120 when peak cutting, surplus charging, and nighttime discharge are not performed. Plan interpolation may be performed during the target period for which the charge and discharge plan is created (for example, one day from 0:00 to 24:00).

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

[0052] Although not shown in Figure 6, the capacity of the energy storage device 120 may include, in addition to the first and second capacities, a capacity for power used in emergencies (hereinafter referred to as BCP (Business Continuity Plan) capacity). An emergency is a disconnected state in which the facility 100 is disconnected from the power grid 12 (for example, a power outage).

[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 the case in which a charge / discharge plan is created for a target period (for example, one day from 0:00 to 24:00) as an example. Furthermore, the power management server 200 may create the charge / discharge plan for the energy storage device 120 at a first timing and correct the charge / discharge plan for the energy storage device 120 at a second timing later than the first timing. For example, the first timing may be 6:00 the day before the target period. The second timing may be immediately before the target period or during the target period.

[0054] As shown in Figure 7, the charge and discharge control for the energy storage device 120 for each of its different purposes includes, in addition to the peak cutting, excess charging, remaining charge adjustment, nighttime discharge, and planned interpolation described above, start / stop, control plan changes, post-power outage countermeasures, pre-power outage countermeasures, and imbalance adjustments.

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

[0056] A control plan change is a control operation that modifies the charge and discharge plan of the energy storage device 120. The control plan change is performed manually in the target section.

[0057] Post-power outage measures include control to discharge the energy storage device 120 in the event of an emergency such as a power outage. If there is surplus power during an emergency, the post-power outage measures may also include control to charge the energy storage device 120 with the surplus power. The post-power outage measures are executed in real time when an emergency such as a power outage occurs. The power outage may include planned power outages. The post-power outage measures may also be implemented using BCP capacity.

[0058] The pre-power outage measure is a control that charges the energy storage device 120 to secure BCP capacity. The BCP capacity may be determined based on the length of the power outage and the predicted power consumption of the facility 100 during the power outage. The BCP capacity may also be predetermined. The pre-power outage measure is an example of a third control that secures the energy storage capacity of the energy storage device 120 to discharge power to be used in an emergency. The pre-power outage measure is executed in real time before an emergency such as a power outage occurs.

[0059] Imbalance adjustment is a control mechanism that reduces the difference between the planned and actual power demand values ​​for facility 100. Imbalance adjustment is an example of a fourth control mechanism that ensures at least one of the storage capacity and available capacity of the energy storage device 120 in order to suppress the deviation of facility 100's power demand from the planned value to below a threshold. Imbalance adjustment is performed in real time within the target section.

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

[0061] As described above, the remaining charge adjustment is a control that adjusts the remaining charge of the energy storage device 120. The remaining charge adjustment may include a first control for peak cutting and a second control for surplus charging. The remaining charge adjustment plan may be created the day before the target section (for example, the first timing described above). The remaining charge adjustment plan may be corrected at a predetermined time (for example, 3 hours) before the unit time (for example, 30 minutes) in which the remaining charge adjustment is expected to be necessary (for example, the second timing described above).

[0062] Nighttime discharge is a control that discharges the energy storage device 120 when the predicted price of purchased electricity is expected to be higher than a threshold, as described above. The nighttime discharge plan may be made 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) earlier than the unit time (for example, 30 minutes) in which nighttime discharge is expected to be necessary.

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

[0064] Here, A through F are defined as the priorities for each charge / discharge control. Figure 7 illustrates a case where the priorities are in the order of A → B → C → D → E → F, with A having the highest priority and F having the lowest priority.

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

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

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

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

[0069] The value of surplus power from a power generation system is the value obtained through surplus charging. The value obtained through surplus charging may be the difference between the price of purchased electricity reduced by surplus charging and the price of surplus electricity sold in the case where surplus charging was not performed. In such cases, if the price of purchased electricity is lower than the price of sold electricity, it is more advantageous to reverse-flow the surplus power, so surplus charging may not be performed, and the remaining capacity adjustment (second control) may also not be performed. In other words, the priority of remaining capacity adjustment (second control) may be the lowest.

[0070] If the power generation device is a solar cell device 110, the value obtained by surplus charging may be environmental value. Environmental value may be the value obtained in the CO2 emission (rights) trading market. If environmental value is prioritized, the priority of residual amount adjustment (second control) may be higher than that of residual amount adjustment (first control).

[0071] Furthermore, the priority of charge / discharge control assumed at the second timing (for example, on the day) may be higher than the priority of charge / discharge control assumed at the first timing (for example, the previous day). In other words, the priority of peak cut, remaining charge adjustment (first control), remaining charge adjustment (second control), nighttime discharge, and planned interpolation assumed on the previous day may be higher than the priority of peak cut, remaining charge adjustment (first control), remaining charge adjustment (second control), nighttime discharge, and planned interpolation assumed on the day.

[0072] Although Figure 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 energy storage device 120 and there is surplus power. While not particularly limited, the priority of surplus charging may be C, similar to peak shaving. It should be noted that surplus charging will not be performed simultaneously with peak shaving.

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

[0074] As shown in Figure 8, in step S10, the power management server 200 may receive actual values ​​of the power demand or power consumption of the facility 100 from the facility 100 (for example, from the measuring device 160). The power management server 200 may also receive actual values ​​of the output power of the solar cell equipment 110 from the facility 100. The power management server 200 may also receive predicted values ​​of the power demand or power consumption of the facility 100 from the facility 100 (for example, from the measuring device 160). The power management server 200 may also receive predicted values ​​of the output power of the solar cell equipment 110 from the facility 100. The power management server 200 may also 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 energy storage device 120 based on the predicted output power of the solar cell device 110 and the predicted power consumption of the facility 100. The priority of each charge / discharge control is used in creating the charge / discharge plan for the energy storage device 120. Step S12 is an example of the first timing.

[0076] In step S14, the power management server 200 sends control commands to the facility 100 according to the charge / discharge plan created in step S12. The control commands may be sent for each target section, or for each unit of time included in the target section.

[0077] In Figure 8, steps S10 to S14 can be considered as processes executed before the target section.

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

[0079] In step S22, the power management server 200 corrects the charge / discharge plan for the energy storage device 120 based on the actual output power of the solar cell system 110 and the actual power consumption of the facility 100. The power management server 200 may also correct the charge / discharge plan for the energy storage device 120 based on the latest predicted output power of the solar cell system 110 and the latest predicted power consumption of the facility 100. The priority of each charge / discharge control is used in correcting the charge / discharge plan for the energy storage device 120. Step S22 is an example of a second timing.

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

[0081] In Figure 8, steps S20 to S24 can be considered as processes executed within the target interval.

[0082] (Mechanism of Action and Effects) In this embodiment, the power management server 200 creates a charge-discharge plan for the energy storage device 120 based on the priorities of two or more charge-discharge controls for different intended uses of the energy storage device 120. The priorities of the two or more charge-discharge controls include a first control for peak cutting and a second control for surplus charging. With this configuration, although peak cutting and surplus charging are not performed simultaneously, the priorities of the controls (first and second controls) for preparing for them may be inconsistent, and by setting these priorities, an appropriate charge-discharge plan for the energy storage device 120 can be created.

[0083] [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.

[0084] In the disclosures mentioned above, "creation" and "amendment" are used as different terms, but since the only difference is the timing, "amendment" may be interpreted as "creation." "Creation" and "amendment" may also be interpreted as "formulation."

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

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

[0087] The above disclosure illustrates a case in which the charge and discharge control of the energy storage device 120 is performed based on control commands received from the power management server 200. However, the embodiments are not limited thereto. The charge and discharge control of the energy storage device 120 may be performed autonomously by the EMS 150. For example, imbalance adjustment may be performed autonomously by the EMS 150 in a second cycle (e.g., 1 minute).

[0088] Although not specifically mentioned in the disclosure above, the predicted power demand for facility 100 may be predicted by learning from past power demand data. In addition to past power demand, the learning process may include time of day, day of the week, season, and weather (solar radiation, temperature, humidity, etc.). The learning process may be machine learning or deep learning, such as AI (Artificial Intelligence).

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

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

[0091] Although not specifically mentioned in the disclosure above, the output power of the fuel cell device 130 may be considered when creating a charge / discharge plan for the energy storage device 120. If reverse power flow of the fuel cell device 130 is observed, 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 its rated output power.

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

[0093] The disclosure described above illustrates a case in which the EMS150 is installed at facility 100. However, the disclosure is not limited to this. The EMS150 may also be provided by a cloud service implemented by a server or the like on network 11.

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

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

[0096] Specifically, there are various purposes for using energy storage devices other than business continuity planning (BCP). For example, possible purposes for using energy storage devices include charging them with surplus power from power generation devices such as solar panels (hereinafter referred to as surplus charging purposes), and discharging power from the energy storage device to suppress peak power to below a threshold during a predetermined time interval (for example, 30 minutes) (hereinafter referred to as peak cutting purposes).

[0097] In such cases, achieving the objective of surplus charging requires securing available capacity in advance to charge surplus power, while achieving the objective of peak shaving requires securing storage capacity (which may also be called remaining storage capacity, as mentioned above) in advance by charging the energy storage device with power to suppress peak power.

[0098] As a result of diligent research considering the above-mentioned cases, the inventor focused on the fact that two or more charge / discharge controls for different purposes are contradictory, and found the necessity of appropriately creating a charge / discharge plan for an energy storage device while considering two or more charge / discharge controls.

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

[0100] 1...Power management system, 11...Network, 12...Power grid, 100...Facilities, 110...Solar cell equipment, 120...Energy storage equipment, 130...Fuel cell equipment, 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. The management department manages facilities that have power generation equipment and energy storage equipment, The system comprises a control unit that creates a charge / discharge plan for the energy storage device based on two or more charge / discharge control priorities for different purposes of use of the energy storage device, The two or more charge / discharge controls described above include at least a first control that secures the storage capacity of the energy storage device in order to suppress the power demand of the facility to a predetermined power level or lower by discharging the energy storage device during a predetermined time interval, and a second control that secures the available capacity of the energy storage device in order to charge the energy storage device with surplus power from the power generation device. A power management device in which the priority of the first control and the second control is determined based on two or more values, including at least the value generated by the reduction of the power demand of the facility and the value of the surplus power of the power generation device.

2. The power management device according to claim 1, wherein the value of the surplus power of the power generation device includes the environmental value obtained by the surplus power of the power generation device when the power generation device is a solar cell device.

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

5. The power management device according to claim 1, wherein the first control includes a control that suppresses the power demand of the facility to a predetermined power or less by discharging the energy storage device during the predetermined time interval.

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

7. The management department manages facilities that have power generation equipment and energy storage equipment, The system comprises a control unit that creates a charge / discharge plan for the energy storage device based on two or more charge / discharge control priorities for different purposes of use of the energy storage device, The two or more charge / discharge controls described above include at least a first control that secures the storage capacity of the energy storage device in order to suppress the power demand of the facility to a predetermined power level or lower by discharging the energy storage device during a predetermined time interval, and a second control that secures the available capacity of the energy storage device in order to charge the energy storage device with surplus power from the power generation device. A power management device comprising two or more charge / discharge controls, each including at least one of the following controls: a third control for securing the storage capacity of the energy storage device to discharge power for use in an emergency, and a fourth control for securing at least one of the storage capacity and available capacity of the energy storage device to suppress the deviation from the planned value regarding the facility's power demand to below a threshold.

8. Steps include managing a facility that has a power generation device and an energy storage device, The process includes the step of creating a charge / discharge plan for the energy storage device based on two or more charge / discharge control priorities for different purposes of use of the energy storage device, The two or more charge / discharge controls described above include at least a first control that secures the storage capacity of the energy storage device in order to suppress the power demand of the facility to a predetermined power level or less over a predetermined time period, and a second control that secures the available capacity of the energy storage device in order to charge the energy storage device with the surplus power of the power generation device. A power management method in which the priority of the first control and the second control is determined based on two or more values, which include at least the value generated by the reduction of the power demand of the facility and the value of the surplus power of the power generation device.

9. Steps include managing a facility that has a power generation device and an energy storage device, The process includes the step of creating a charge / discharge plan for the energy storage device based on two or more charge / discharge control priorities for different purposes of use of the energy storage device, The two or more charge / discharge controls described above include at least a first control that secures the storage capacity of the energy storage device in order to suppress the power demand of the facility to a predetermined power level or less over a predetermined time period, and a second control that secures the available capacity of the energy storage device in order to charge the energy storage device with the surplus power of the power generation device. A power management method comprising the above two or more charge / discharge controls, including at least one of the following controls: a third control that secures the storage capacity of the energy 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 energy storage device in order to suppress the deviation of the facility's power demand from the planned value to a threshold or less.

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