JP2023142720A - Power management device and power management method - Google Patents

Abstract

To provide a power management device and a power management method allowing appropriate use of a distributed power supply when considering both first control and second control.SOLUTION: A power management device comprises: a management unit that manages distributed power supplies provided respectively in two or more facilities connected with a power system; and a control unit that, in first control for maintaining the frequency of the power system, specifies a target distributed power supply used for the first control. The control unit determines the order of priority of the distributed power supplies specified as the target distributed power supply based on at least one of first priority of the distributed power supply related to the first control and second priority of the distributed power supply related to second control other than the first control.SELECTED DRAWING: Figure 4

Description

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

BACKGROUND ART In recent years, in order to maintain the power supply and demand balance in an electric power system, a technology (for example, VPP (Virtual Power Plant)) using a power storage device as a distributed power source has been known. In such cases, it is necessary to adjust the frequency of the power grid using reverse flow power supplied from the facility to the power grid (hereinafter referred to as supply and demand adjustment).

When performing such a supply and demand adjustment, a technique is known that determines the charging and discharging power of a power storage device for each service (energy management, supply and demand adjustment). For example, in supply and demand adjustment, an upper limit value for charging and discharging power of a power storage device is set (for example, Patent Document 1).

JP2020-137368A

By the way, in supply and demand adjustment, the supplyable power that can be supplied by distributed power sources such as power storage devices is submitted in advance to the power management device (for example, RA; Resource Aggregator), and the distributed power sources operate while securing the supplyable power. There is a need to.

However, even during periods when supply and demand adjustment (hereinafter referred to as 1st control) is not required, it is necessary to ensure the power that distributed power sources can supply, and for uses other than 1st control, it is necessary to reduce the power that can be supplied from the rated power of distributed power sources. It is only possible to use the removed residual power. On the other hand, it is expected that distributed power sources will also be used for control related to the management of facility power demand (hereinafter referred to as "secondary control").

Therefore, when considering both the first control and the second control, it is necessary to assume a situation where the distributed power source cannot be utilized appropriately.

Therefore, the present invention has been made to solve the above-mentioned problems, and is a power management device that makes it possible to appropriately utilize distributed power sources when both the first control and the second control are considered. and a power management method.

One aspect of the disclosure includes a management unit that manages distributed power sources installed in each of two or more facilities connected to an electric power system, and a first control for maintaining a frequency of the electric power system. a control unit that specifies a target distributed power source used for the first control, and the control unit specifies a first priority of the distributed power source related to the first control and a second priority of the distributed power source related to a second control other than the first control. The power management device determines the priority of the distributed power source specified as the target distributed power source based on at least one of the priorities.

One aspect of the disclosure provides that in step A of managing distributed power sources installed in each of two or more facilities connected to an electric power system, and a first control for maintaining the frequency of the electric power system, the first control a step B of identifying a target distributed power source used for the first control, and the step B includes a first priority of the distributed power source regarding the first control and a second priority of the distributed power source regarding a second control other than the first control. The power management method includes the step of determining the priority of the distributed power source specified as the target distributed power source based on at least one of the priorities.

According to the present invention, it is possible to provide a power management device and a power management method that make it possible to appropriately utilize distributed power sources when both the first control and the second control are considered.

FIG. 1 is a diagram showing a power management system 1 according to an embodiment. FIG. 2 is a diagram showing the facility 100 according to the embodiment. FIG. 3 is a diagram showing the power storage device 120 according to the embodiment. FIG. 4 is a diagram showing the power management server 200 according to the embodiment. FIG. 5 is a diagram for explaining frequency fluctuation adjustment according to the embodiment. FIG. 6 is a diagram for explaining the priority order of distributed power sources according to the embodiment. FIG. 7 is a diagram for explaining the priority order of distributed power sources according to the embodiment. FIG. 8 is a diagram for explaining the priority order of distributed power sources according to the embodiment. FIG. 9 is a diagram for explaining the priority order of distributed power sources according to the embodiment. FIG. 10 is a diagram for explaining the priority order of distributed power sources according to the embodiment. FIG. 11 is a diagram illustrating a power management method according to the embodiment. FIG. 12 is a diagram for explaining the priority order of distributed power sources according to modification example 1.

Embodiments will be described below with reference to the drawings. In addition, in the description of the following drawings, the same or similar parts are given the same or similar symbols. However, the drawings are schematic.

[Embodiment]
(power management system)
A power management system according to an embodiment will be described below. A power management system may simply be referred to as a power system.

As shown in FIG. 1, the power management system 1 includes a facility 100 and a power management server 200.

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

The facility 100 is connected to the power grid 12 and may be supplied with power from the power grid 12, or may be supplied with power to the power grid 12. The power from the power system 12 to the facility 100 may be referred to as tidal power, purchased power, or demand power. The power from the facility 100 to the power system 12 may be referred to as reverse flow power or sold power. In FIG. 1, the facilities 100 are illustrated as facilities 100A to 100C.

Although not particularly limited, the facility 100 may be a facility such as a residence, a store, or an office. Facility 100 may be an apartment complex including two or more residences. The facility 100 may be a complex facility that includes at least two of a residence, a store, and an office. Details of the facility 100 will be described later (see FIG. 2).

Power management server 200 is managed by a business operator that manages power related to power system 12. The business operator may be a power generation business, a power transmission/distribution business, or a retail business. The operator may be a resource aggregator (hereinafter referred to as RA) or an aggregation coordinator (AC) that manages RA. The RA may be an operator that adjusts the power supply and demand balance of the power system 12. Adjustment of the power supply and demand balance may include a transaction (hereinafter referred to as negawatt transaction) in which the reduced power demand (tidal power) of the facility 100 is exchanged for value. Adjusting the power supply and demand balance may include a transaction in which increased power of reverse flow power is exchanged for value. In VPP, the RA may be a business such as a power generation business, a power transmission/distribution business, or a retail business.

In the embodiment, communication between the power management server 200 and the EMS 160 is performed according to the first protocol. On the other hand, communication between the EMS 160 and the distributed power source (solar battery device 110, power storage device 120, or fuel cell device 130) is performed according to a second protocol different from the first protocol. For example, as the first protocol, a protocol compliant with Open ADR (Automated Demand Response) or an original dedicated protocol can be used. For example, the second protocol can use a protocol based on ECHONET Lite (registered trademark), SEP (Smart Energy Profile) 2.0, KNX, or an original dedicated protocol. Note that the first protocol and the second protocol only need to be different; for example, even if both are unique dedicated protocols, they only need to be protocols created according to different rules. However, the first protocol and the second protocol may be protocols created according to the same rules.

(facility)
The facilities according to the 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) 160. Facility 100 may include measurement device 190.

Solar cell device 110 is a distributed power source that generates power according to light such as sunlight. For example, the solar cell device 110 includes a PCS (Power Conditioning System) and a solar panel. Here, installation may mean that solar cell device 110 and power system 12 are connected.

Power storage device 120 is a distributed power source that charges and discharges power. For example, power storage device 120 is configured with a PCS and a power storage cell. Here, installation may mean that power storage device 120 and power system 12 are connected.

The fuel cell device 130 is a distributed power source that generates power using fuel. For example, the fuel cell device 130 is composed of a PCS and a fuel cell. Here, installation may mean that the fuel cell device 130 and the power system 12 are connected.

For example, the fuel cell device 130 may be a solid oxide fuel cell (SOFC), a polymer electrolyte fuel cell (PEFC), or a phosphoric acid fuel cell (SOFC). It may be a phosphoric acid fuel cell (PAFC) or a molten carbonate fuel cell (MCFC).

Load device 140 is a device that consumes power. For example, the load equipment 140 may include an air conditioner that adjusts the temperature of a predetermined space of the facility 100, and may include a lighting device that adjusts the illuminance of a predetermined space of the facility 100. Load equipment 140 may include video equipment, audio equipment, refrigerators, washing machines, personal computers, and the like.

EMS 160 manages power related to facility 100. EMS 160 may control solar cell device 110, power storage device 120, fuel cell device 130, and load equipment 140. In the embodiment, the EMS 160 is illustrated as a device that receives control commands from the power management server 200, but such a device may be called a gateway or simply a control unit. To distinguish it from the power management server 200, the EMS 160 may be called a LEMS (Local EMS), a HEMS (Home EMS), or a VPP controller.

Measuring device 190 measures power flow from power system 12 to facility 100. Measuring device 190 may measure reverse power flow from facility 100 to power system 12. For example, the measuring device 190 may be a Smart Meter belonging to an electric power company. The measuring device 190 may transmit an information element indicating the measurement result (integrated value of power flow power or reverse power flow power) at the first interval (for example, 30 minutes) to the EMS 160 at each first interval. Measuring device 190 may send to EMS 160 an information element indicating a measurement result in a second interval (eg, 1 minute) that is shorter than the first interval.

(Power storage device)
A power storage device according to an embodiment will be described below. As shown in FIG. 3, power storage device 120 includes BT 121, monitoring section 122, and control section 123. Although omitted in FIG. 3, power storage device 120 may include a PCS.
BT121 is a power storage cell included in power storage device 120.

The monitoring unit 122 monitors the frequency of the power system 12. For example, the monitoring unit 122 is connected to a measuring device installed between the power system 12 and the facility 100, and monitors the frequency of power measured by the measuring device. The measuring device may be installed at the same location as the measuring device 190 described above.

Control unit 123 may include at least one processor. The at least one processor may be comprised of a single integrated circuit (IC), or may be comprised of multiple communicatively connected circuits (such as integrated circuits and/or discrete circuit(s)). Good too.

Control unit 123 controls BT121. In the embodiment, control unit 123 may control charging or discharging of power storage device 120 in the first control for maintaining the frequency of power system 12. Control unit 123 may control charging or discharging of power storage device 120 in a second control other than the first control.

Here, the first control may be a control that autonomously performs charging and discharging based on the frequency of the power system 12 monitored by the monitoring unit 122. The first control may be applied to short-cycle control (eg, GF), which will be described later. The first control may be referred to as VPP control.

The second control may be control related to management of power demand of facility 100 where power storage device 120 is installed. The second control may be a control that reduces the error with respect to the planned value of the power demand of the facility 100. The second control may be referred to as energy management control.

Although not particularly limited, the error with respect to the planned value of power demand may be an error between the planned value of power demand and the actual value of power demand, or the difference between the planned value of power demand and the predicted value of power demand. It may be an error of The predicted value of power demand may be a value predicted at a later timing than the timing at which the planned value of power demand is formulated.

For example, the period to which the first control can be applied may be defined as a target period (for example, one day). In such a case, the planned value of power demand may include a plan that is formulated at a timing earlier than the target period (for example, at 12:00 on the day before the target period). The predicted value of power demand may include a value predicted at a timing earlier than a unit period (for example, a 30-minute period) included in the target period (for example, one hour before the unit period).

(power management server)
A power management server according to an embodiment will be described below. As shown in FIG. 4, the power management server 200 includes a communication section 210, a management section 220, and a control section 230.

Communication unit 210 is configured by a communication module. The communication module may be a wireless communication module that complies with standards such as IEEE802.11a/b/g/n/ac/ax, ZigBee, Wi-SUN, LTE, 5G, 6G, and standards such as IEEE802.3. It may also be a wired communication module compliant with .

For example, the communication unit 210 may communicate with the facility 100 (power storage device 120 or EMS 160).

First, the communication unit 210 may receive information indicating the behavior of the facility 100 regarding the first control (hereinafter referred to as first behavior information) from the facility 100. The first behavior information may include information indicating whether or not the user desires to participate in the first control, and may also include information indicating whether or not the user actively desires to contribute to the first control.

Second, the communication unit 210 may receive information indicating the behavior of the facility 100 regarding the second control (hereinafter referred to as second behavior information) from the facility 100. The second behavior information may include information indicating whether or not to execute the second control while securing the supplyable amount that the power storage device 120 can supply for the first control, and may include information indicating whether or not to execute the second control while ensuring the supply amount that the power storage device 120 can supply, and depending on the planned value of the power demand of the facility 100. The information may include information indicating whether or not to execute the second control as prescribed, and information indicating whether or not to execute the second control so as to reduce the error with respect to the planned value of the power demand of the facility 100. May include.

The management unit 220 is configured by a storage medium such as an HDD (Hard Disk Drive), an SSD (Solid State Drive), or a nonvolatile memory.

The management unit 220 manages information regarding the facility 100. For example, information regarding the facility 100 includes the type of distributed power source (solar battery device 110, power storage device 120, or fuel cell device 130) installed in the facility 100, the type of distributed power source (solar battery device 110, power storage device 120, or fuel cell device 130) installed in the facility 100, Specifications of the fuel cell device 130), etc. The specifications may include the rated power generation of the solar cell device 110, the rated charging power of the power storage device 120, the rated charging power of the power storage device 120, and the rated output power of the fuel cell device 130. The specifications may include the rated capacity, maximum charging/discharging power, etc. of power storage device 120.

In the embodiment, the management unit 220 constitutes a management unit that manages distributed power sources installed in each of two or more facilities 100 connected to the power system 12.

Control unit 230 may include at least one processor. The at least one processor may be comprised of a single integrated circuit (IC), or may be comprised of multiple communicatively connected circuits (such as integrated circuits and/or discrete circuit(s)). Good too.

In the embodiment, the control unit 230 constitutes a control unit that specifies a target distributed power source to be used for the first control in the first control for maintaining the frequency of the power system 12. The control unit 230 identifies the target distributed power source based on at least one of a first priority of the distributed power source regarding the first control and a second priority of the distributed power source regarding a second control other than the first control. Determine the priority of distributed power generation. Details of the priority order of distributed power sources will be described later.

(Frequency fluctuation adjustment)
Below, frequency fluctuation adjustment of the power system 12 according to the embodiment will be explained.

As shown in FIG. 5, the control related to frequency fluctuation adjustment differs depending on the fluctuation period of the adjustment target. Specifically, control related to frequency fluctuation adjustment is divided into short-period control in which the fluctuation period of the adjustment target is short (for example, several tens of seconds to several minutes), and short-period control in which the fluctuation period of the adjustment target is shorter than the short period. Medium-period control that has a long medium period (for example, several minutes to several tens of minutes) and long-period control that has a long period (for example, several tens of minutes to several hours) in which the fluctuation period of the adjustment target is longer than the medium period. and, including.

Here, the short-cycle control may be referred to as GF (Governor Free). Short-cycle control is a control for eliminating supply and demand fluctuations that cannot be tracked by medium-cycle control. For example, such fluctuations in supply and demand can be caused by the suspension of operation of a regulated power source that operates under short-term control.

Medium period control may be referred to as LFC (Load Frequency Control) or AFC (Automatic Frequency Control). Medium-cycle control is control for eliminating fluctuations in supply and demand, which are difficult to predict.

Long-period control may be referred to as DPC (Dispatching Power Control) or EDC (Economic Load Dispatching Control). Long-period control is control for eliminating fluctuations in supply and demand based on supply and demand forecasts.

Although not particularly limited, the specific control in which the power storage device 120 autonomously controls charging and discharging based on the frequency of the power grid 12 may be applied to the above-mentioned short-cycle control (for example, GF). .

(assignment)
In the background described above, consider a case in which both the first control and the second control are considered. In the following, a case will be mainly described in which the distributed power source used for the first control and the second control is the power storage device 120. Therefore, the target distributed power source may be referred to as the target power storage device 120.

In such a case, assuming that power storage devices 120 that wish to participate in the first control uniformly execute the first control, the following problem exists.

First, power storage device 120 needs to always secure a supplyable amount in order to support the first control. Therefore, in reality, it is necessary to secure the supplyable amount even during periods when the first control is not required, and in the second control, the remaining power obtained by subtracting the supplyable power from the rated power of the power storage device 120 is used. I can only do it. For example, if we assume that the frequency fluctuation is within ±0.2 Hz over 99% of the period to which the first control can be applied, and the adjustment rate is 5%, then approximately 8 Only % is used for the first control. That is, even though there is room to use the deliverable amount in the second control, the deliverable amount is always secured, so power storage device 120 cannot be used effectively.

Second, there is a method to efficiently execute the first control and the second control by having the power management server 200 dynamically control the power storage device 120. Since it is required to measure the charging and discharging power of power storage device 120 with a granularity of 0.3%, the load on power management server 200 for acquiring the charging and discharging power of power storage device 120 with a granularity of 0.3% is extremely large. Therefore, it is better to select the target power storage device 120 in advance and leave the operation of the first control itself to the autonomous operation of the target power storage device 120.

In the embodiment, in order to solve the above-mentioned problem, the power management server 200 specifies in advance the target power storage device 120 to be used for the first control from among the power storage devices 120 installed in each of the two or more facilities 100. .

(Priority of distributed power sources)
The priority order of power storage device 120 according to the embodiment will be explained below. Since the target power storage device 120 is specified by the power management server 200, the operation of the control unit 230 of the power management server 200 will be mainly described.

First, control unit 230 may specify the first priority of power storage device 120 based on the first behavior information described above.

The first priority may be defined by an element indicating whether or not contribution to the first control is actively desired. For example, the first priority of a power storage device 120 that actively desires to contribute to the first control may be higher than the first priority of a power storage device 120 that does not actively desire to contribute to the first control. (Hereinafter referred to as Judgment Criteria 1-A).

Second, control unit 230 may specify the second priority of power storage device 120 based on the second behavior information described above.

The second priority may be defined by an element indicating whether or not to execute the second control while securing the supplyable amount (that is, the chargeable and dischargeable amount) that the power storage device 120 can supply for the first control. . The second priority of the power storage device 120 that executes the second control while securing the supplyable amount for the first control is the second priority of the power storage device 120 that executes the second control without securing the supplyable amount for the first control. It may be higher than 2 Priority (hereinafter referred to as Criterion 2-A).

The second priority may be defined by an element indicating whether or not to execute the second control as determined by the planned power demand value of the facility 100. The second priority of the power storage device 120 that executes the second control as determined by the planned value of the power demand of the facility 100 is such that the second priority of the power storage device 120 does not execute the second control as determined by the planned value of the power demand of the facility 100. The priority may be higher than the second priority of power storage device 120 (hereinafter referred to as determination criterion 2-B).

The second priority may be defined by an element indicating whether or not to perform the second control so as to reduce the error with respect to the planned value of the power demand of the facility 100. The second priority of the power storage device 120 that does not perform the second control so as to reduce the error with respect to the planned value of the power demand of the facility 100 is the second priority of the power storage device 120 that does not perform the second control so as to reduce the error with respect to the planned value of the power demand of the facility 100. The priority may be higher than the second priority of power storage device 120 to be executed (hereinafter, determination criterion 2-C).

Furthermore, the second priority may be defined by a combination of the criteria 2A to 2C described above. For example, the second priority of the power storage device 120 that performs the second control as determined by the planned power demand value of the facility 100 is the power storage device that performs the second control while ensuring the supplyable amount for the first control. It may be higher than the second priority of the device 120 (hereinafter referred to as determination criterion 2-D). The second priority of the power storage device 120 that executes the second control while securing the supplyable amount for the first control is the power storage device that executes the second control so as to reduce the error with respect to the planned value of the power demand of the facility 100. It may be higher than the second priority of 120 (hereinafter referred to as criterion 2-E).

Here, the first priority and the second priority are priorities for determining the priority of the power storage device 120 specified as the target power storage device 120 used for the first control. Therefore, it should be noted that the second priority is not the priority of power storage device 120 used for the second control, but the priority of power storage device 120 used for the first control. The power storage device 120 priority used for the second control may be considered to be a priority in the reverse order of the power storage device 120 used for the first control (ie, the second priority).

Third, control unit 230 determines the priority order of power storage device 120 based on at least one of the first priority and the second priority. That is, control unit 230 determines the priority order of power storage device 120 based on one or more criteria selected from criteria 1-A and criteria 2A to 2E.

Here, control unit 230 may specify target power storage device 120 from among power storage devices 120 that wish to participate in the first control. Control unit 230 may specify target power storage device 120 for each frequency variation range of power system 12 for which the first control is requested. Target power storage device 120 for each variation range may be specified based on the priority of power storage device 120 (that is, at least one of the first priority and second priority).

For example, as shown in FIG. 6, the supplyable amount (total) of the power storage device 120 managed by the power management server 200 is ±1000kW, the frequency of the power system 12 is 50Hz, and the regulation rate is 5%. Let's illustrate a case. In such a case, when the frequency fluctuation is 2.5 Hz, power storage device 120 managed by power management server 200 is required to discharge 1000 kW of power. Although not particularly limited, a predetermined range (-0.01 to +0.01Hz) may be a dead zone.

Here, the control unit 230 identifies power storage device #A as the target power storage device 120 to be used in the fluctuation range of -0.2Hz or less and from -0.2 to 1.25Hz, and uses it in the fluctuation range of -0.2Hz or less and from 1.25 to 2.0Hz. Power storage device #B is identified as target power storage device 120, and power storage device #C is identified as target power storage device 120 used in a fluctuation range of −0.2 Hz or lower and 2.0 to 2.5 Hz. Regarding the priorities used in the first control, the priority of power storage device #A is higher than the priority of power storage device #B, and the priority of power storage device #B is higher than the priority of power storage device #C. Each of power storage devices #A to #C only needs to include at least one target power storage device 120. Power storage devices #A to #C may be considered to be groups #A to #C.

Under such a premise, control unit 230 identifies target power storage devices 120 that belong to each of groups #A to #C based on the first priority and second priority. For example, the control unit 230 actively desires to contribute to the first control as the target power storage device 120 belonging to group #A, and the control unit 230 performs the second control as determined by the planned power demand value of the facility 100. The power storage device 120 that executes may be specified. The control unit 230 selects a power storage device that actively desires to contribute to the first control as the target power storage device 120 belonging to group #B, and executes the second control while securing the supplyable amount for the first control. 120 may be specified. The control unit 230 does not actively wish to contribute to the first control as the target power storage device 120 belonging to group #C, and performs the second control so as to reduce the error with respect to the planned value of the power demand of the facility 100. The power storage device 120 that executes may be specified.

For example, in a case where the supply capacity of the target power storage device 120 belonging to group #A is ±500kW, as shown in FIG. The first control is executed in the Hz fluctuation range. It should be noted that in such a case, it is necessary to change the adjustment rate (+ side) applied to target power storage device 120 belonging to group #A from 5% to 2.5%.

For example, in a case where the available supply amount of the target power storage device 120 belonging to group #B is ±300kW, as shown in FIG. The first control is executed within the variation range of . In such a case, note that it is necessary to change the adjustment rate (+ side) applied to the target power storage device 120 belonging to group #B from 5% to 4%, and to set 0 to 1.25Hz as a dead band. Should.

For example, in a case where the available supply amount of the target power storage device 120 belonging to group #C is ±300kW, as shown in FIG. Execute the first control within the variation range. In such a case, keep in mind that it is necessary to set the dead band from 0 to 2.0Hz without changing the regulation rate (+ side) applied to the target power storage device 120 belonging to group #C at 5%. Should.

In the examples shown in FIGS. 7 to 9, in the fluctuation range of -0.2 to 0 Hz, only the target power storage device 120 belonging to group #A executes the first control, and the target power storage devices 120 belonging to group #B and group #C execute the first control. 120 may not be the only one to execute the first control.

Here, the behavior of target power storage devices 120 belonging to groups #A to #C will be described, focusing on the fluctuation range of -0.2 to 0 Hz. Here, the reference value is the charge/discharge amount of the power storage device 120 used for calculating the supplyable amount, and the actual value is the charge/discharge amount of the power storage device 120 obtained as a result of the first control or the second control. .

As shown in FIG. 10, the target power storage device 120 belonging to group #A executes the first control based on the reference value, so the actual value is based on the reference value in order to maintain the frequency of the power system 12. may vary. On the other hand, target power storage devices 120 belonging to Group #B and Group #C have room to execute the second control, and the actual value may deviate from the reference value due to the second control. That is, target power storage devices 120 belonging to group #B and group #C can be effectively used for the second control. In addition, in FIG. 10, a case is illustrated in which the frequency deviation falls within a dead band (for example, −0.1 to 1.0 Hz) before time t, and the frequency deviation falls below −0.2 Hz after time t.

Here, the frequency of switching between charging and discharging required by the second control may be lower than the frequency of switching between charging and discharging required by the first control. In such a configuration, deterioration of target power storage device 120 belonging to group #A is unavoidable, but deterioration of target power storage device 120 belonging to group #B and group #C can be suppressed.
(Power management method)

A power management method according to an embodiment will be described below. FIG. 11 illustrates a case where AC and RA are separate entities. The power management server 200 described above may be an RA.

As shown in FIG. 11, in step S10, the AC transmits the adjustment rate to the RA.

In step S11, the RA sends an inquiry to the facility 100. The inquiry is a message requesting first behavior information and second behavior information.

In step S12, the RA receives a response to the inquiry from the facility 100. The answer includes first behavior information and second behavior information.

In step S13, the RA determines the priority of the power storage device 120 specified as the target power storage device 120 used for the first control based on the first priority and the second priority. RA may specify target power storage device 120 for each frequency variation range of power system 12.

In step S14, the RA sets (sends) an adjustment rate to be applied to the target power storage device 120 specified for each variation range.

In step S20, the AC transmits a command regarding adjustment of the frequency of the power system 12 (adjustment command) to the RA.

In step S21, RA transmits a control command for power storage device 120 to adjust the frequency of power system 12 to facility 100.

In step S22, target power storage device 120 installed in facility 100 executes first control or second control.

In step S23, the RA receives the results (actual results) of the first control and the second control from the facility 100.

In step S24, the RA may re-determine the priority of the power storage device 120 specified as the target power storage device 120 used for the first control based on the results (actual results) of the first control and the second control. The RA may re-specify the target power storage device 120 for each frequency variation range of the power system 12.

For example, the RA may perform processing such as lowering the priority of the target power storage device 120 whose remaining charging capacity or remaining discharging capacity is smaller than a threshold value. Alternatively, the RA may perform processing such as lowering the priority of the target power storage device 120 installed in the facility 100 where the error with respect to the planned value of power demand is larger than a threshold value.

In step S25, the RA may reset (send) the adjustment rate to be applied to the target power storage device 120 specified for each variation range.

Thereafter, the processes from step S22 to step S25 may be repeated.

Although FIG. 11 illustrates a case in which the adjustment rate is transmitted from the AC to the RA in step S10, the adjustment rate may be determined in advance and may be manually set at the RA.

(action and effect)
In the embodiment, the power management server 200 selects the target based on at least one of the first priority of the power storage device 120 regarding the first control and the second priority of the power storage device 120 regarding the second control other than the first control. The priority order of power storage devices 120 identified as power storage devices 120 is determined. According to such a configuration, compared to a case where power storage devices 120 that wish to participate in the first control uniformly perform the first control, it is possible to secure power storage devices 120 that can perform the second control. , the power storage device 120 can be appropriately utilized when both the first control and the second control are considered.

In the embodiment, the power management server 200 may identify the target power storage device 120 for each frequency variation range of the power system 12. According to such a configuration, power storage device 120 can be appropriately utilized while maintaining the frequency of power system 12 through the first control.

[Change example 1]
Modification example 1 of the embodiment will be described below. In the following, differences from the embodiments described above will be mainly explained.

In the embodiment, a case is illustrated in which group #A corresponds to -0.2 Hz or less and a fluctuation range of -0.2 to 1.25 Hz, and group #B corresponds to -0.2 Hz or less and a fluctuation range of 1.25 to 2.0 Hz.

On the other hand, in modification example 1, as shown in FIG. 12, part of group #A (#A-1) and part of group #B (#B-1) are -0.2Hz or less Supports a fluctuation range of ~1.25Hz, and part of group #A (#A-2) and part of group #B (#B-2) supports a fluctuation range of -0.2Hz or less and 1.25 to 2.0Hz. You may.

In this way, target power storage devices 120 for each frequency variation range of power system 12 may be relatively freely specified without being restricted only by the priority order of power storage devices 120.

[Change example 2]
Modification example 2 of the embodiment will be described below. In the following, differences from the embodiments described above will be mainly explained.

In modification example 2, variations in the method for determining the priority order of power storage device 120 will be described.

First, the power management server 200 may identify the first priority or the second priority based on the difference between the current SoC (State of Charge) and the target SoC assumed by executing the first control. . For example, the greater the difference between the current SoC and the target SoC, the higher the first priority or second priority may be. According to such a configuration, the frequency of switching between charging and discharging of power storage device 120 can be reduced.

Second, power management server 200 may specify the first priority or the second priority based on the degree of deterioration of power storage device 120. For example, the lower the degree of deterioration, the higher the first priority or the second priority may be. According to such a configuration, it is possible to suppress a situation in which the deterioration of power storage device 120 progresses due to the first control.

Thirdly, power management server 200 may specify the first priority based on the upper limit of the amount of change in charging power or discharging power of power storage device 120 per unit time. For example, the larger the upper limit of the amount of change, the higher the first priority may be. According to such a configuration, the responsiveness of the power storage device 120 used for the first control to the control command is increased, and the frequency adjustment accuracy of the power system 12 is improved.

[Other embodiments]
Although the present invention has been described with reference to the embodiments described above, the statements and drawings that form part of this disclosure should not be understood as limiting the present invention. Various alternative embodiments, implementations, and operational techniques will be apparent to those skilled in the art from this disclosure.

In the above-mentioned disclosure, the case where the distributed power source used for the first control and the second control is the power storage device 120 has been exemplified. However, the above disclosure is not limited thereto. The distributed power source used for the first control and the second control may be any distributed power source whose output power can be adjusted, such as the fuel cell device 130.

Although not specifically mentioned in the above disclosure, the priority order of power storage device 120 corresponding to the + side fluctuation range may be different from the priority order of power storage device 120 corresponding to the − side fluctuation range. The priority order of power storage device 120 corresponding to the − side fluctuation range may be determined without determining the priority order of power storage device 120 corresponding to the + side fluctuation range. The priority order of power storage device 120 corresponding to the + side fluctuation range may be determined without determining the priority order of power storage device 120 corresponding to the − side fluctuation range.

In the above-mentioned disclosure, the case where the first control is autonomously executed by power storage device 120 is exemplified. However, the above disclosure is not limited thereto. The first control may be executed autonomously within the facility 100, or may be executed autonomously under the control of the EMS 160.

Although not specifically mentioned in the above disclosure, the priority order of power storage devices 120 may be determined for each facility 100. In such a case, target power storage device 120 may be read as target facility 100 where power storage device 120 is installed.

1...power management system, 11...network, 12...power system, 100...facility, 110...solar cell device, 120...power storage device, 121...BT, 122...monitoring section, 123...control section, 130...fuel cell device, 140...load equipment, 160...EMS, 190...measuring device, 200...power management server, 210...communication department, 220...management department, 230...control unit

Claims (8)

A management department that manages distributed power sources installed in each of two or more facilities connected to the power system;
In the first control for maintaining the frequency of the power system, a control unit that specifies a target distributed power source to be used for the first control,
The control unit controls the target distribution based on at least one of a first priority of the distributed power source regarding the first control and a second priority of the distributed power source regarding a second control other than the first control. A power management device that determines the priority of the distributed power sources identified as power sources. The power management device according to claim 1, wherein the second control is control related to management of power demand of a facility where the distributed power source is installed. The power management device according to claim 1 or 2, wherein the control unit specifies the target distributed power source for each frequency variation range of the power system where the first control is requested. The first priority is defined by an element indicating whether the distributed power source actively desires to contribute to the first control. Power management device. The second priority is an element indicating whether or not to execute the second control while securing the amount that can be supplied by the distributed power source for the first control, and the demand of the facility where the distributed power source is installed. an element indicating whether or not to execute the second control as determined by the planned power value; The power management device according to any one of claims 1 to 4, defined by at least one of the shown elements. The power management device according to any one of claims 1 to 5, wherein the control unit specifies the target distributed power source from among distributed power sources that wish to participate in the first control. The power management device according to any one of claims 1 to 6, wherein the distributed power source includes at least a power storage device. Step A of managing distributed power sources installed in each of two or more facilities connected to the power system;
In the first control for maintaining the frequency of the power system, a step B of identifying a target distributed power source to be used for the first control,
The step B includes determining the target distributed power source based on at least one of a first priority of the distributed power source regarding the first control and a second priority of the distributed power source regarding a second control other than the first control. A power management method comprising determining a priority of the distributed power sources identified as power sources.