Power Management System

Abstract

To provide a power supply management system configured to be capable of appropriately raising and lowering power reception point power of each facility even when values of power generation efficiency of a plurality of power supply devices differ from each other.SOLUTION: A power supply device 8 is interconnected with a power system 7 in a state in which power is suppliable to a power load unit 9 and power is suppliable to a power system 7 and in a state in which power is suppliable from the power system 7 to the power load unit 9. A deterioration state detection unit 5 for detecting a deterioration state of the power supply device 8 is provided. The management device 2 receives an adjustment force delivery commend and performs command transmission processing of dividing, on the basis of the deterioration state, an output request value of the received delivery commend into a plurality of values before allocating the values to a plurality of power supply devices 8 and transmitting output control commands for determining output power of the power supply devices 8 corresponding to the allocated values to the plurality of power supply devices 8.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a power management system including power supply devices installed in each of a plurality of facilities and capable of outputting electric power, and a management device capable of communicating with the plurality of power supply devices from outside the facilities. [Background technology]

[0002] As disclosed in Patent Document 1, a power management system that includes a plurality of facilities, power supply devices, and a management device has been proposed based on the concept of a virtual power plant (VPP).

[0003] In the power management system, when a management device receives a command to provide adjustment power, the management device provides the adjustment power of the power supply devices of each facility to the power grid on the day of provision. In this way, by consolidating multiple facilities and power supply devices that are distributed in a distributed manner using the management device, the multiple facilities and power supply devices can function as a single power plant or consumer market. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-125907 A Summary of the Invention [Problem to be solved by the invention]

[0005] Generally, when a power supply device is operated for a long period of time, it deteriorates due to various factors, and the power generation efficiency of a deteriorated power supply device may decrease. Due to differences in the operating conditions of the power supply device and the surrounding environment, the deterioration progresses differently among multiple power supply devices, and the power generation efficiency also differs from one another.

[0006] The present invention aims to configure a power management system that can appropriately lower and raise the power at the power receiving point of each facility even if the power generation efficiencies of multiple power supply devices differ from one another. [Means for solving the problem]

[0007] The present invention is a power supply management system comprising: a power supply device installed in each of a plurality of facilities and capable of outputting electric power; and a management device capable of communicating between the plurality of power supply devices from outside the facilities, wherein the power supply devices are capable of supplying electric power to a power load unit and are connected to the power system in a state in which they can supply electric power to the power system and in a state in which they can supply electric power from the power system to the power load units; the power supply devices are provided with a deterioration state detection unit that detects the deterioration state of each of the power supply devices; and the management device receives a command to supply adjustment power and performs a command transmission process in which, based on the deterioration state, the output request value of the received supply command is divided into multiple parts and assigned to the plurality of power supply devices, and an output control command that determines the output power of the power supply device according to the assigned value is transmitted to the plurality of power supply devices.

[0008] According to the present invention, when a supply command is received by a management device, the management device divides the output request value of the supply command into multiple allocation values ​​and allocates them to each power supply device in order to reduce or increase the receiving point power at each facility. When the management device reduces the power receiving point power of each power supply device, the management device transmits a power receiving point power reduction command as an output control command to the power supply device, thereby increasing the output power of the power supply device based on the allocation value included in the power receiving point reduction command, thereby creating adjustment power. By supplying power equivalent to the allocation value (adjustment power of each facility) to the power grid, the management device is able to supply power (total adjustment power) equivalent to the output request value of the supply command. When increasing the power receiving point power of each power supply device, the management device transmits a power receiving point power increase command as an output control command to the power supply device, thereby reducing the output power of the power supply device based on the allocation value included in the power receiving point increase command, thereby creating adjustment power. By introducing power equivalent to the allocation value (adjustment power of each facility) to each facility, the management device is able to supply power (total adjustment power) equivalent to the output request value of the supply command.

[0009] The progression of deterioration will differ among the multiple power supply devices, and the power generation efficiency will also differ among the multiple power supply devices. According to the present invention, when the output request value of the supply command is divided into multiple allocation values ​​and allocated to the power supply units, the allocation values ​​are set based on the deterioration state of the power supply units, thereby making it possible to set allocation values ​​that enable the multiple power supply units as a whole to generate power efficiently while suppressing further deterioration of power supply units that are already severely deteriorated. This allows the power receiving point power of each facility to be appropriately increased or decreased while the multiple power supply devices as a whole generate power efficiently, thereby improving the efficiency of the power management system.

[0010] In the present invention, it is preferable that the power supply devices include a power supply device whose power generation efficiency or charge / discharge efficiency decreases when the output power of the power supply device decreases.

[0011] Power supply devices installed in facilities may include power supply devices, such as fuel cell devices and charge / discharge devices, whose power generation efficiency or charge / discharge efficiency decreases when the output power of the power supply device decreases. According to the present invention, by setting an allocation value based on the deterioration state of a power supply device, it is possible to suppress further deterioration of a deteriorated power supply device while reducing the number of power supply devices that are operated with a large reduction in output power, which is advantageous in terms of improving the efficiency of the power supply management system.

[0012] In the present invention, when the management device issues a power receiving point power reduction command as an output control command to multiple power supply devices in order to reduce the power receiving point of the facility, it is preferable to increase the allocation value for a power supply device whose degradation state is lower than that of the other power supply devices more than the allocation values ​​of the other power supply devices.

[0013] According to the present invention, when the management device issues a power reception point power reduction command to reduce the power reception point of the facility, an operation is performed to increase the allocation value of a power supply device in a less deteriorated state compared to the allocation values ​​of other power supplies. This results in a state where a power supply device in a low state of degradation (a power supply device with no significant degradation) experiences a large increase in output power, while a power supply device in a high state of degradation (a power supply device with significant degradation) experiences a small increase in output power, thereby making it possible to suppress further degradation of a power supply device that is highly degraded.

[0014] In the present invention, the power supply unit of the power supply device is a fuel cell device equipped with a fuel cell unit, and when the management device issues a power receiving point power increase command as an output control command to multiple power supply devices in order to increase the power receiving point of the facility, it is preferable to increase the allocation value for a fuel cell device whose deterioration state is higher than that of the other fuel cell devices, more than the allocation values ​​of the other fuel cell devices.

[0015] According to the present invention, when the management device issues a command to increase the power receiving point power of the facility, an operation is performed to increase the allocation value of a fuel cell device in a highly deteriorated state more than the allocation values ​​of other fuel cell devices. This results in a state in which a fuel cell device in a low state of degradation (a fuel cell device where degradation is not advanced) experiences a small reduction in output power, while a fuel cell device in a high state of degradation (a fuel cell device where degradation is advanced) experiences a large reduction in output power, thereby making it possible to suppress further deterioration of a fuel cell device that is highly deteriorated.

[0016] In the present invention, it is preferable that the deterioration state includes at least one of the power generation output, power generation efficiency, fuel consumption, temperature, accumulated power generation time, and failure history of the fuel cell device.

[0017] In a fuel cell device, the power generation output, power generation efficiency, fuel consumption, temperature, cumulative power generation time, and failure history can be obtained accurately and easily, so according to the present invention, the deterioration state of the fuel cell device can be accurately detected by the deterioration state detection unit.

[0018] In the present invention, the power supply unit of the power supply device is a charging / discharging device equipped with a charging / discharging unit, and when the management device issues a power receiving point power increase command as an output control command to a plurality of the charging / discharging devices in order to increase the power receiving point of the facility, it is preferable to increase the allocation value for the charging / discharging device whose deterioration state is lower than that of the other charging / discharging devices more than the allocation values ​​of the other charging / discharging devices.

[0019] According to the present invention, when the management device issues a command to increase the receiving point power to increase the receiving point power of the facility, an operation is performed to increase the allocation value of a charging / discharging device in a less deteriorated state compared to the allocation values ​​of other charging / discharging devices. As a result, a charge / discharge device in a low state of degradation (a charge / discharge device where degradation is not advanced) experiences a large reduction in output power, while a charge / discharge device in a high state of degradation (a charge / discharge device where degradation is advanced) experiences a small reduction in output power, thereby making it possible to suppress further deterioration of a charge / discharge device that is highly deteriorated.

[0020] In the present invention, it is preferable that the deterioration state includes at least one of the battery capacity, charge / discharge efficiency, maximum input / output current, and failure history of the charge / discharge device.

[0021] In a charging / discharging device, the battery capacity, charging / discharging efficiency, maximum input / output current, and failure history can be obtained accurately and easily, so according to the present invention, the deterioration state of the charging / discharging device can be accurately detected by the deterioration state detection unit. [Brief description of the drawings]

[0022] [Figure 1] FIG. 2 is a diagram showing the relationship between facilities, a management device, and an aggregation coordinator. [Diagram 2] FIG. 1 is a diagram showing the layout of a facility. [Diagram 3] FIG. 2 is a diagram showing the internal configuration of the fuel cell device. [Figure 4] 11 is a diagram showing a state in which load following control is performed such that the output power of the fuel cell device and the load power of a power load device have the same value. FIG. [Diagram 5] FIG. 5 is a diagram showing a state in which the output power of the fuel cell device is increased from the state shown in FIG. [Figure 6] 11 is a diagram showing a state in which load following control is performed such that the output power of the fuel cell device and the load power of a power load device have the same value. FIG. [Figure 7] FIG. 7 is a diagram showing a state in which the output power of the fuel cell device is reduced from the state shown in FIG. 6. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] (Power Management System Overview) 1 and 2 show a power management system 1 having a management device 2 and a plurality of facilities 3. Outside the power management system 1, there exist an aggregation coordinator 4, a supply and demand adjustment market (not shown), a power transmission and distribution company (not shown), and the like.

[0024] The management device 2, also known as a resource aggregator, is an operator that controls consumer-side energy resources by transmitting control information to a fuel cell device 8 and a power load device 9 as consumer-side energy resources to a facility 3 that has entered into a virtual power plant (VPP, virtual power plant) service contract.

[0025] The aggregation coordinator 4 is an operator that aggregates the amount of power controlled by each management device 2 and trades power with general electricity transmission and distribution operators and retail electricity operators in the electricity trading market (supply and demand adjustment market, wholesale electricity market, capacity market, etc.).

[0026] 1 and 2, a management device 2 sequentially collects and stores power information such as output power A1 of a fuel cell device 8, load power B1 of a power load device 9, and power at the receiving point of a power meter 10 at the facility 3 from a plurality of facilities 3. In this embodiment, the term "load power B1 of a power load device 9" refers to the total load power B1 of all power load devices 9 installed in the facility 3.

[0027] The management device 2 predicts the amount of power that can be supplied from each facility 3 in a predetermined time period in the future, and transmits this to the aggregation coordinator 4. This available power is the adjustment capability of the facility 3, such as the ability to increase or decrease the power at the receiving point. In this embodiment, "increasing the power at the receiving point" means increasing the power received from the power system 7 to the power line 14 (forward flow power) or decreasing the reverse flow power from the power line 14 to the power system 7, and "lowering the power at the receiving point" means decreasing the power received from the power system 7 to the power line 14 (forward flow power) or increasing the reverse flow power from the power line 14 to the power system 7.

[0028] For example, in order to increase the receiving point power of facility 3, it is sufficient to at least one of lowering the output power A1 of fuel cell device 8 and increasing the load power B1 of power load device 9. Therefore, the upward adjustment margin when increasing the receiving point power of facility 3 indicates how much margin there is for lowering the output power A1 of fuel cell device 8 and how much margin there is for increasing the load power B1 of power load device 9.

[0029] In order to reduce the power receiving point of the facility 3, it is sufficient to at least one of increasing the output power A1 of the fuel cell device 8 and reducing the load power B1 of the power load device 9. Therefore, the downward adjustment margin when reducing the power receiving point of the facility 3 indicates how much margin there is for increasing the output power A1 of the fuel cell device 8 and how much margin there is for reducing the load power B1 of the power load device 9.

[0030] The management device 2 determines baseline power receiving point power in the multiple facilities 3 that it manages. This baseline power receiving point power corresponds to the total of the power receiving point power of each facility 3 predicted in the case where the facilities 3 are not caused to provide adjustment capacity (i.e., adjustment capacity provided to the power transmission and distribution company and supply capacity provided to retailers, etc.).

[0031] The aggregation coordinator 4 aggregates the available adjustment power received from each management device 2, and trades with general electricity transmission and distribution companies and electricity retailers by bidding on trading markets such as the supply and demand adjustment market, the wholesale electricity market, and the capacity market. When the aggregation coordinator 4 receives a command to supply adjustment power for a specified future control period from a general electricity transmission and distribution company or an electricity retailer with which it has traded, it distributes and transmits the adjustment power specified in the supply command to each management device 2.

[0032] When the management device 2 receives a supply command from the aggregation coordinator 4, it distributes and transmits the adjustment power specified in the supply command to each facility 3. Each facility 3 is controlled to supply the adjustment power of the fuel cell device 8 as a consumer-side energy resource during a predetermined future control period. As a result, adjustment power is supplied such that the power receiving point of the facility 3 increases or decreases compared to the case where the above-mentioned control is not performed.

[0033] (Facility configuration) As shown in Figure 2, each facility 3 is provided with a fuel cell device 8 (corresponding to a power supply device), a power load device 9 (corresponding to a power load section), a power meter 10, a gateway 11, a router 12, a remote control 13, a power measurement section 15, and a deterioration state detection section 5, etc.

[0034] In the facility 3, a power line 14 is provided, the power line 14 is interconnected with the power system 7, and a power meter 10 is provided on the power line 14. A fuel cell device 8 and a power load device 9 are connected to the power line 14, and a power measurement unit 15 is provided on the power line 14. The power load device 9 is, for example, a lighting device, an air conditioning device, or the like, and can receive a supply of power from at least one of the fuel cell device 8 and the power system 7.

[0035] A remote control 13 is connected to the fuel cell device 8, and a user of the facility 3 can operate the remote control 13 to give commands to the fuel cell device 8. The power meter 10 detects the power at the power receiving point of the facility 3, and the detected power at the power receiving point is transmitted to the management device 2 via the gateway 11 and the router 12.

[0036] (Configuration of fuel cell device) 2 and 3, the fuel cell device 8 is provided with a power conversion unit 16, a fuel cell unit 17, a fuel reforming unit 18, a fuel cell control unit 19, a memory unit 20, etc. The power conversion unit 16 and the fuel cell unit 17 are connected to the power system 7 via a power line 14.

[0037] A fuel cell section 17, a gas manifold 21, a vaporizer 22, and a fuel reforming section 18 are housed in a container 6 having thermal insulation properties. Fuel such as city gas and water for reforming are supplied to the vaporizer 22, where a mixed gas of fuel and steam is generated and the mixed gas is supplied to the fuel reforming section 18. The supplied mixed gas is reformed in the fuel reforming section 18 to generate a fuel gas containing hydrogen, and the fuel gas containing hydrogen is supplied to the gas manifold 21. Air is also supplied to the inside of the container 6.

[0038] Fuel gas containing hydrogen passes through the gas manifold 21 and fuel cell section 17, whereby power is generated, and the power generated by the fuel cell section 17 is supplied to the power conversion section 16. After being used for power generation in the fuel cell section 17, the fuel gas containing hydrogen is combusted inside the container 6 to heat the fuel cell section 17, the vaporizer 22, and the fuel reforming section 18, and the combustion exhaust gas is discharged from the container 6 after combustion.

[0039] The power generated by the fuel cell unit 17 is converted by the power conversion unit 16 to a predetermined voltage, frequency and phase and supplied to the power line 14, and a fuel cell control unit 19 controls the operation of the fuel cell unit 17 and the power conversion unit 16. Information handled by the fuel cell device 8 is stored in a memory unit 20.

[0040] (Power generation status in fuel cell device) As shown in FIG. 2, the fuel cell control unit 19 can perform load following control (see FIG. 4) to increase or decrease the output power A1 of the fuel cell device 8 so that the detected value of the power (power supplied from the power grid 7) detected by the power measuring unit 15 becomes zero (so that the output power A1 of the fuel cell device 8 and the load power B1 of the power load device 9 become the same value).

[0041] The fuel cell control unit 19 can perform control to increase or decrease the output power A1 of the fuel cell device 8 so that the power at the power receiving point of the facility 3 detected by the power meter 10 increases or decreases, separately from the load following control. The fuel cell control unit 19 can maintain the output power A1 of the fuel cell device 8 at the upper limit value AM1 to perform continuous operation (rated output operation).

[0042] The above three controls of the fuel cell device 8 are performed in a form of adjusting the output power from the fuel cell device 8 to the power line 14 between an upper limit value AM1 and a lower limit value AM2 (see Figs. 4 and 5). Generally, in the fuel cell device 8, when the output power A1 of the fuel cell device 8 decreases, the power generation efficiency of the fuel cell device 8 decreases.

[0043] The fuel cell control unit 19 has information about the output power A1 supplied from the power conversion unit 16 to the power line 14 and information about the power measured by the power meter 10, and is therefore able to derive the load power B1 (=output power A1+measured power) of the power load device 9. When the sign of the power measured by the power meter 10 is positive (forward power flow) (received power), this means that the load power B1 is greater than the output power A1 of the fuel cell device 8, and when the sign of the power measured by the power meter 10 is negative (reverse power flow), this means that the output power A1 of the fuel cell device 8 is greater than the load power B1.

[0044] When the detection value of the power measuring unit 15 is a positive value, it means that the power of the power system 7 is being introduced into the power line 14, and that the output power A1 of the fuel cell device 8 is smaller than the load power B1 of the power load device 9. When the detection value of the power measuring unit 15 is a negative value, it means that the power of the power line 14 is being supplied to the power system 7, and that the output power A1 of the fuel cell device 8 is larger than the load power B1 of the power load device 9.

[0045] Increasing the receiving point power means increasing the receiving power from the power system 7 to the power line 14, or decreasing the reverse flow current from the power line 14 to the power system 7. Reducing the receiving point power means decreasing the receiving power from the power system 7 to the power line 14, or increasing the reverse flow current from the power line 14 to the power system 7.

[0046] (Configuration of Deterioration State Detection Unit) As shown in FIGS. 2 and 3, a fuel gauge 23 for detecting the amount of fuel supplied to the carburetor 22, and temperature sensors 24, 25, and 26 are provided.

[0047] In the fuel cell device 8, the temperature sensor 24 detects the atmospheric temperature inside the container 6 (hot module). The temperature sensor 25 detects the temperature of the fuel reforming section 18. The temperature sensor 26 detects the temperature of the combustion exhaust gas when the fuel gas containing hydrogen is burned inside the container 6 after being used for power generation in the fuel cell section 17. The detection value of the fuel meter 23 and the detection values ​​of the temperature sensors 24, 25, 26 are input to the fuel cell control section 19 and the memory section 20.

[0048] The deterioration state detection unit 5 detects (calculates) the ratio of the output power A1 (output) of the fuel cell device 8 to the detection value (input) of the fuel gauge 23 as the power generation efficiency of the fuel cell device 8. The power generation efficiency of the fuel cell device 8 detected by the deterioration state detection unit 5 is transmitted to the management device 2.

[0049] The power generation efficiency of the fuel cell device 8 means the deterioration state of the fuel cell device 8. If the power generation efficiency of the fuel cell device 8 is high, it can be determined that the deterioration of the fuel cell device 8 is not progressing (deterioration state is determined to be low), and if the power generation efficiency of the fuel cell device 8 is low, it can be determined that the deterioration of the fuel cell device 8 is progressing (deterioration state is determined to be high).

[0050] (Adjustment capacity in facilities) The state shown in Figure 4 is a state in which the output power A1 of the fuel cell device 8 and the load power B1 of the power load device 9 are the same value, and the output power A1 of the fuel cell device 8 is lower than the upper limit value AM1.As shown in Figure 5, it is possible to increase the output power A1 of the fuel cell device 8 to near the upper limit value AM1.

[0051] 4 and 5, when an operation to increase the output power A1 of the fuel cell device 8 is performed and the output power A1 of the fuel cell device 8 becomes greater than the load power B1 of the power load device 9, the difference between the output power A1 of the fuel cell device 8 and the load power B1 of the power load device 9 becomes positive adjustment power A2P. Positive adjustment power A2P is surplus power of the facility 3, and can be supplied from the facility 3 to the power grid 7.

[0052] The state shown in Figure 6 is a state in which the output power A1 of the fuel cell device 8 and the load power B1 of the power load device 9 have the same value, and the output power A1 of the fuel cell device 8 is approximately the same as the upper limit value AM1, and as shown in Figure 7, it is possible to operate the output power A1 of the fuel cell device 8 to decrease.

[0053] 6 and 7, when an operation to reduce the output power A1 of the fuel cell device 8 is performed and the output power A1 of the fuel cell device 8 becomes smaller than the load power B1 of the power load device 9, the difference between the output power A1 of the fuel cell device 8 and the load power B1 of the power load device 9 becomes the negative adjustment capability A2M. The negative adjustment capability A2M is the power shortage of the facility 3, and is the power that can be introduced from the power grid 7 to the power load device 9.

[0054] In each of the facilities 3, positive adjustment power A2P or negative adjustment power A2M is generated due to changes in the power generation state of the fuel cell device 8 or changes in the load state of the power load device 9. The sum of the positive adjustment powers A2P of the facilities 3 is the power that can be supplied by the power source management system 1 (total adjustment power), and the sum of the negative adjustment powers A2M of the facilities 3 is the power that can be introduced by the power source management system 1 (total adjustment power).

[0055] (Flow between management device, aggregation coordinator and supply and demand adjustment market) As shown in Figures 1 and 2, the management device 2 collects and stores various types of power information from each of the facilities 3, such as the receiving point power, the detection value of the power measuring unit 15, the power generation efficiency of the fuel cell device 8 (the detection value of the deterioration state detection unit 5), and information about the fuel cell device 8.

[0056] The management device 2 predicts the future generation state of positive and negative adjustment power A2P, A2M in the facility 3 based on current and past power information, predicts the total positive adjustment power A2P and the total negative adjustment power A2M, and calculates the outputtable power in the control target period based on these. The outputtable power is the adjustment margin for increasing the receiving point power of the facility 3 or decreasing the receiving point power.

[0057] If the supplyable power in the control period can satisfy the adjustment capacity (output request value) in the control period in the supply command from the aggregation coordinator 4, the management device 2 transmits to the aggregation coordinator 4 a message indicating that the supply command can be complied with. Note that, if the supplyable power does not satisfy the output request value in the supply command, the management device 2 may transmit the supplyable power in the control period to the aggregation coordinator 4.

[0058] The available power supply may be, for example, "power supply of xx kW can be made available from xx o'clock to xx o'clock on xx day of xx month in the future" or "power supply of xx kW can be introduced from xx o'clock to xx o'clock on xx day of xx month in the future." Similar information is also transmitted to the aggregation coordinator 4 from the management devices 2 of other power supply management systems 1.

[0059] The aggregation coordinator 4 bids in the supply and demand adjustment market based on the available power of the multiple power management systems 1, and trades with the power transmission and distribution business operator. When a transaction is concluded between the aggregation coordinator 4 and the power transmission and distribution company as a result of the transaction, the aggregation coordinator 4 transmits a supply command to each of the power management systems 1 (management devices 2).

[0060] The management device 2 issues output control commands to the multiple fuel cell devices 8 to determine the output power A1 of the fuel cell devices 8. The output control commands issued by the management device 2 to the facilities 3 include a power receiving point power decrease command to decrease the power receiving point of the facilities 3, and a power receiving point power increase command to increase the power receiving point of the facilities 3. Note that the management device 2 may also issue an output control command to maintain the power receiving point power.

[0061] When the fuel cell device 8 receives an output control command from the management device 2, it operates in a first operation mode aiming at providing an output power A1 determined based on the output control command during the control period covered by the output control command. In periods other than the output control period, the fuel cell device 8 operates in a second operation mode different from the first operation mode. The second operation mode of the fuel cell device 8 includes the load following control and rated output operation described above in (Facility configuration).

[0062] (Processing of the management device that received a command to provide positive control power) (Part 1) When the management device 2 receives a command to supply positive adjustment power (when the management device 2 issues a command to reduce power at the receiving point as an output control command), for example, on the morning of the day that power is to be supplied to the power grid 7 or several hours before supplying power to the power grid 7, the management device 2 selects a fuel cell device 8 that is available for supply from the fuel cell devices 8 as described below.

[0063] 4, the management device 2 selects, as fuel cell devices 8 available for supply, those fuel cell devices 8 whose output power A1 is sufficiently lower than the upper limit value AM1 and which can tolerate an increase in the output power A1. Fuel cell devices 8 whose output power A1 is close to the upper limit value AM1 and which cannot tolerate an increase in the output power A1 are excluded from the selection as fuel cell devices 8 that cannot be supplied.

[0064] (Processing of the management device that received a command to provide positive control power) (Part 2) After selecting a fuel cell device 8 that can supply power, the management device 2 divides the output request value of the positive adjustment power supply command into multiple allocation values ​​based on the power generation efficiency of the fuel cell device 8, as described below, and allocates the allocation values ​​to the fuel cell device 8 that can supply power.

[0065] For example, assume that there are fuel cell devices 8(A), 8(B), 8(C), 8(D), and 8(E) that can be donated. If the power generation efficiency of the fuel cell devices 8(A) to 8(E) that are available for supply is the same, 20% of the output request value of the command to supply positive adjustment power is allocated to each of the fuel cell devices 8(A) to 8(E) as the allocation value.

[0066] Suppose that the order of power generation efficiency among the donatable fuel cell devices 8(A) to 8(E) is, for example, fuel cell device 8(A)>fuel cell device 8(B)>fuel cell device 8(C)>fuel cell device 8(D)>fuel cell device 8(E).

[0067] In this case, for example, 35% of the output request value of the supply command for positive regulation power is allocated to the fuel cell device 8(A) as an allocation value. For example, 30% of the output request value of the command to supply positive regulation power is allocated to the fuel cell device 8(B) as an allocation value. For example, 20% of the output request value of the command to supply positive regulation power is allocated to the fuel cell device 8(C) as an allocation value. For example, 10% of the output request value of the command to supply positive regulation power is allocated to the fuel cell device 8(D) as an allocation value. For example, 5% of the output request value of the command to supply positive regulation power is allocated to the fuel cell device 8(E) as an allocation value.

[0068] Suppose that the power generation efficiency of the donatable fuel cell devices 8(A) to 8(E) is, for example, fuel cell devices 8(A), 8(E)<fuel cell device 8(C)<fuel cell devices 8(B), 8(D).

[0069] In this case, for example, 10% of the output request value of the positive adjustment power supply command is assigned as an allocation value to the fuel cell device 8(A), and 10% of the output request value of the positive adjustment power supply command is assigned as an allocation value to the fuel cell device 8(E). For example, 20% of the output request value of the command to supply positive regulation power is allocated to the fuel cell device 8(C) as an allocation value. For example, 30% of the output request value of the positive regulation power supply command is assigned as an allocation value to fuel cell device 8(B), and 30% of the output request value of the positive regulation power supply command is assigned as an allocation value to fuel cell device 8(D).

[0070] As described above, the output request value of the command to supply positive regulation power is divided into a plurality of allocation values ​​based on the level of power generation efficiency of the fuel cell device 8. When a power receiving point power reduction command is issued as an output control command to multiple fuel cell devices 8 to reduce the power receiving point of facility 3, the allocation value becomes larger in fuel cell devices 8 with high power generation efficiency (fuel cell devices 8 in a low state of degradation) and becomes smaller in fuel cell devices 8 with low power generation efficiency (fuel cell devices 8 in a high state of degradation) (this corresponds to a state in which the allocation value for a power supply device whose state of degradation is lower than the other power supply devices is increased above the allocation values ​​of the other power supply devices).

[0071] (Processing of the management device that received a command to provide positive control power) (Part 3) After an allocation value has been assigned to the fuel cell device 8, when supplying power to the power grid 7, the management device 2 issues a power receiving point power reduction command as an output control command to the multiple fuel cell devices 8 in order to reduce the power receiving point of the facility 3 (this corresponds to a command transmission process of transmitting an output control command to the multiple power supply devices, which determines the output power of the power supply device according to the allocation value).

[0072] As shown in Figs. 4 and 5, in the facility 3, the output power A1 of the fuel cell device 8 is increased based on the allocated value to generate a positive adjustment power A2P. By providing the positive adjustment power A2P created in each of the fuel cell devices 8 to the power grid 7, the management device 2 is able to provide the summed positive adjustment power as power equivalent to the output request value of the supply command.

[0073] When the output power A1 of the fuel cell device 8 is increased based on the allocation value, it is assumed that, due to the power generation efficiency of the fuel cell device 8 or an error contained in the allocation value, a fuel cell device 8 occurs in which the output power A1 reaches the upper limit value AM1 before covering the allocated allocation value.

[0074] In this case, the management device 2 maintains the output power A1 of the fuel cell device 8 described above at the upper limit value AM1, and divides the remainder of the allocated value of this fuel cell device 8 into multiple parts. Of the fuel cell devices 8 that were excluded from selection as fuel cell devices 8 that cannot be supplied as described in the above (Processing of the management device that has received a command to supply positive adjustment power) (part 1), the management device 2 selects, as fuel cell devices 8 that can be supplied, those fuel cell devices 8 whose output power A1 is relatively lower than the upper limit value AM1 and for which an increase in output power A1 can be tolerated, and allocates the remainder of the divided allocation value to the newly selected fuel cell device 8 and issues a command to reduce the power receiving point power to this fuel cell device 8.

[0075] (Processing of the management device that received a command to provide negative control capacity) (Part 1) When the management device 2 receives a command to supply negative adjustment power (when the management device 2 commands an increase in power receiving point power as an output control command), the management device 2 selects a fuel cell device 8 that can be introduced from among the fuel cell devices 8 as described below.

[0076] 6, the management device 2 selects, as an introducible fuel cell device 8, a fuel cell device 8 whose output power A1 is sufficiently higher than the lower limit value AM2 and which can tolerate a decrease in the output power A1. A fuel cell device 8 whose output power A1 is close to the lower limit value AM2 and which cannot tolerate a decrease in the output power A1 is excluded from the selection as a fuel cell device 8 that cannot be introduced.

[0077] (Processing of the management device that received a command to provide negative control capacity) (Part 2) After selecting a fuel cell device 8 that can be introduced, the management device 2 divides the output request value of the negative adjustment power supply command into multiple allocation values ​​based on the power generation efficiency of the fuel cell device 8, as described below, and allocates the allocation values ​​to the fuel cell device 8 that can be introduced.

[0078] For example, assume that there are fuel cell devices 8(A), 8(B), 8(C), 8(D), and 8(E) that can be installed. If the power generation efficiency of the introduceable fuel cell devices 8(A)-8(E) is the same, 20% of the output request value of the negative regulation power supply command is assigned as the allocation value to each of the fuel cell devices 8(A)-8(E).

[0079] Suppose that the power generation efficiency of the introduceable fuel cell devices 8(A) to 8(E) is in the order of fuel cell device 8(A)>fuel cell device 8(B)>fuel cell device 8(C)>fuel cell device 8(D)>fuel cell device 8(E).

[0080] In this case, for example, 35% of the output request value of the command to supply negative regulation power is allocated to the fuel cell device 8(E) as an allocation value. For example, 30% of the output request value of the command to supply negative regulation power is allocated to the fuel cell device 8(D) as an allocation value. For example, 20% of the output request value of the command to supply negative regulation power is allocated to the fuel cell device 8(C) as an allocation value. For example, 10% of the output request value of the command to supply negative regulation power is allocated to the fuel cell device 8(B) as an allocation value. For example, 5% of the output request value of the command to supply negative regulation power is allocated to the fuel cell device 8(A) as an allocation value.

[0081] Suppose that the power generation efficiency of the introduceable fuel cell devices 8(A) to 8(E) is, for example, fuel cell device 8(A), 8(E)<fuel cell device 8(C)<fuel cell device 8(B), 8(D).

[0082] In this case, for example, 10% of the output request value of the negative adjustment power supply command is assigned as an allocation value to fuel cell device 8(B), and 10% of the output request value of the negative adjustment power supply command is assigned as an allocation value to fuel cell device 8(D). For example, 20% of the output request value of the command to supply negative regulation power is allocated to the fuel cell device 8(C) as an allocation value. For example, 30% of the output request value of the negative adjustment power supply command is assigned as an allocation value to the fuel cell device 8(A), and 30% of the output request value of the negative adjustment power supply command is assigned as an allocation value to the fuel cell device 8(E).

[0083] As described above, the output request value of the command to supply negative regulation power is divided into a plurality of allocation values ​​based on the level of power generation efficiency of the fuel cell device 8. When a power receiving point power increase command is issued as an output control command to multiple fuel cell devices 8 to increase the power receiving point of facility 3, the allocation value is smaller for fuel cell devices 8 with high power generation efficiency (fuel cell devices 8 in a low state of degradation) and larger for fuel cell devices 8 with low power generation efficiency (fuel cell devices 8 in a high state of degradation) (this corresponds to a state in which the allocation value for a power supply device whose state of degradation is higher than the other power supply devices is increased above the allocation values ​​of the other power supply devices).

[0084] (Processing of the management device that received the command to provide negative control capacity) (Part 3) After the allocation value is assigned to the fuel cell device 8, when power is introduced from the power grid 7, the management device 2 issues a power receiving point power increase command as an output control command to the multiple fuel cell devices 8 in order to increase the power receiving point of the facility 3 (this corresponds to a command transmission process of transmitting an output control command to the multiple power supply devices, which determines the output power of the power supply device according to the allocation value).

[0085] As shown in Figs. 6 to 7, in the facility 3, the output power A1 of the fuel cell device 8 is reduced based on the allocated value, and a negative adjustment power A2M is created. By supplying the negative adjustment power A2M created in each of the fuel cell devices 8 to the power grid 7, the management device 2 is able to supply the summed negative adjustment power as power equivalent to the output request value of the supply command.

[0086] When the output power A1 of the fuel cell device 8 is reduced based on the allocation value, it is assumed that, due to the power generation efficiency of the fuel cell device 8 or an error contained in the allocation value, a fuel cell device 8 occurs in which the output power A1 reaches the lower limit value AM2 before the allocated allocation value is reached.

[0087] In this case, the management device 2 maintains the output power A1 of the fuel cell device 8 described above at the lower limit value AM2, and divides the remainder of the allocated value of this fuel cell device 8 into multiple parts. Of the fuel cell devices 8 that were excluded from selection as fuel cell devices 8 that cannot be introduced as described in the above (Processing of the management device that has received a command to supply negative adjustment power) (part 1), the management device 2 selects as fuel cell devices 8 that can be introduced those fuel cell devices 8 whose output power A1 is relatively higher than the lower limit value AM2 and for which a reduction in output power A1 can be tolerated, and allocates the remainder of the divided allocation value to the newly selected fuel cell device 8 and issues a command to increase the power receiving point power to this fuel cell device 8.

[0088] (First Alternative Embodiment of the Invention) In the facility 3, a plurality of fuel cell devices 8 may be provided, and a plurality of power load devices 9 may be provided.

[0089] (Second Alternative Embodiment of the Invention) The power generation efficiency of the fuel cell device 8 may be determined as the ratio of the detected value of the fuel gauge 23 to the output power A1, and this power generation efficiency may be determined as the degraded state. In this case, if the ratio of the detection value of the fuel gauge 23 to the output power A1 is low, it can be determined that deterioration is not progressing in the fuel cell device 8 (the deterioration state is determined to be low), and if the ratio of the detection value of the fuel gauge 23 to the output power A1 is high, it can be determined that deterioration is progressing in the fuel cell device 8 (the deterioration state is determined to be high).

[0090] (Third Alternative Embodiment of the Invention) As the degraded state of the fuel cell device 8, the power generation output (output power A1) when the fuel, air, and steam amounts are constant may be used as the degraded state. In this case, if the power generation output is high, it can be determined that deterioration is not progressing in the fuel cell device 8 (the deterioration state is determined to be low), and if the power generation output is low, it can be determined that deterioration is progressing in the fuel cell device 8 (the deterioration state is determined to be high).

[0091] (Fourth Alternative Embodiment of the Invention) When the power generation output (output power A1) described above in the third alternative embodiment of the invention is taken as the rated output, the difference between the rated output and the output power A1 may be used as the degradation state. In this case, if the difference between the rated output and the output power A1 is small, it can be determined that degradation is not progressing in the fuel cell device 8 (the degradation state is determined to be low), and if the difference between the rated output and the output power A1 is large, it can be determined that degradation is progressing in the fuel cell device 8 (the degradation state is determined to be high).

[0092] (Fifth Alternative Embodiment of the Invention) As the deterioration state of the fuel cell device 8, the integrated value (accumulated value) of the output power A1 from when the power generation is started for the first time may be used as the deterioration state. In this case, if the integrated value (cumulative value) of the output power A1 is low, it can be determined that deterioration is not progressing in the fuel cell device 8 (the deterioration state is determined to be low), and if the integrated value (cumulative value) of the output power A1 is high, it can be determined that deterioration is progressing in the fuel cell device 8 (the deterioration state is determined to be high).

[0093] (Sixth Alternative Embodiment of the Invention) As the deterioration state of the fuel cell device 8, the amount of fuel (fuel consumption amount) required to obtain a certain output power A1 may be used as the deterioration state. In this case, if the fuel consumption is low, it can be determined that the deterioration of the fuel cell device 8 is not progressing (the deterioration state is determined to be low), and if the fuel consumption is high, it can be determined that the deterioration of the fuel cell device 8 is progressing (the deterioration state is determined to be high).

[0094] (Seventh Alternative Embodiment of the Invention) When the fuel cell device 8 starts generating power for the first time, the detection values ​​of the temperature sensors 24, 25, 25 in the state where a specified output power A1 is being obtained are stored as normal values, and the difference between the detection values ​​of the temperature sensors 24, 25, 25 in the state where a specified output power A1 is being obtained by subsequent power generation by the fuel cell device 8 and the normal values ​​can be used as the deterioration state. In this case, if the difference between the detection values ​​of the temperature sensors 24, 25, 25 and the normal values ​​is small, it can be determined that deterioration is not progressing in the fuel cell device 8 (the deterioration state is determined to be low), and if the difference between the detection values ​​of the temperature sensors 24, 25, 25 and the normal values ​​is large, it can be determined that deterioration is progressing in the fuel cell device 8 (the deterioration state is determined to be high).

[0095] For example, if the normal detection value of the temperature sensor 24 is 650°C, and there is a fuel cell device 8 whose detection value of the temperature sensor 24 is 670°C and another fuel cell device 8 whose detection value of the temperature sensor 24 is 700°C, it can be determined that the fuel cell device 8 whose detection value of the temperature sensor 24 is 700°C is more deteriorated (its state of deterioration is determined to be more severe).

[0096] (Eighth Alternative Embodiment of the Invention) As the deterioration state of the fuel cell device 8, the accumulated value of the power generation time from when power generation is first started (accumulated power generation time) may be used as the deterioration state. In this case, if the cumulative power generation time is short, it can be determined that deterioration is not progressing in the fuel cell device 8 (the deterioration state is determined to be low), and if the cumulative power generation time is long, it can be determined that deterioration is progressing in the fuel cell device 8 (the deterioration state is determined to be high).

[0097] (Ninth Alternative Embodiment of the Invention) When a failure or error occurs in the fuel cell device 8, values ​​weighted according to the importance of the location where the failure or error occurred are accumulated (failure history), and the failure history may be used as the deterioration state. In this case, if the failure history is low, it can be determined that deterioration is not progressing in the fuel cell device 8 (the deterioration state is determined to be low), and if the failure history is high, it can be determined that deterioration is progressing in the fuel cell device 8 (the deterioration state is determined to be high).

[0098] When operating conditions under which a failure or error occurred in the past are stored, the possibility of a failure or error occurring increases if the current operating conditions are the same as those under which a failure or error occurred. As a result, a state in which the current operating conditions are the same as the operating conditions under which failures and errors occurred in the past can be added to the aforementioned failure history as a predicted value of the failure history, and this can be treated as a failure history representing a deteriorated state.

[0099] (Tenth Alternative Embodiment of the Invention) Among the above power generation efficiency, power generation output, integrated value (accumulated value) of output power A1, fuel consumption, difference between the detected values ​​of temperature sensors 24, 25, 25 and normal values, accumulated power generation time and failure history of the fuel cell device 8, multiple data may be extracted, the extracted data may be weighted, and the sum of the weighted data may be used as the degradation state.

[0100] (Eleventh Alternative Embodiment of the Invention) In the above (Processing of the management device that receives a command to supply positive adjustment capacity) (Part 2) and (Processing of the management device that receives a command to supply negative adjustment capacity) (Part 2), the numerical values ​​(35%, 30%, 20%, 10%, 5%) of the allocation value of the output request value of the command to supply positive adjustment capacity (negative adjustment capacity) (30%, 20%, 10%) are just examples, and there are many other numerical values ​​for the allocation value, such as (40%, 35%, 25%), etc.

[0101] (Twelfth Alternative Embodiment of the Invention) In the above embodiment, a specific example of the configuration of the power supply management system of the present invention has been given and explained, but the configuration can be modified as appropriate. For example, in the above embodiment, an example has been described in which the power supply unit of the power supply device includes the fuel cell unit 17, but the power supply unit may be another device capable of outputting electric power. For example, the power supply unit may be a device including a charge / discharge unit such as a storage battery. In that case, a charge / discharge device is realized that has the functions of a power supply device used in a power management system and the power supply unit includes a charge / discharge unit. Alternatively, the power supply unit may be a device including an engine and a generator driven by the engine.

[0102] (Thirteenth embodiment of the invention) If a charge / discharge device (not shown) equipped with a charge / discharge section is provided instead of the fuel cell device 8, the charge / discharge efficiency calculated (detected) from the accumulated power and released power of the charge / discharge device based on the detection value of the power meter 10 may be used as the degradation state. When the charge / discharge efficiency is high, it can be determined that deterioration is not progressing in the fuel cell device 8 (the deterioration state is determined to be low), and when the charge / discharge efficiency is low, it can be determined that deterioration is progressing in the fuel cell device 8 (the deterioration state is determined to be high).

[0103] When a receiving point power increase command is issued as an output control command to multiple charging / discharging devices to increase the receiving point power of facility 3, the allocation value is configured to be larger for charging / discharging devices with high charging / discharging efficiency (charging / discharging devices in a low state of deterioration) and smaller for charging / discharging devices with low charging / discharging efficiency (charging / discharging devices in a high state of deterioration) (this corresponds to a state in which the allocation value for a charging / discharging device whose state of deterioration is lower than the other charging / discharging devices is increased more than the allocation values ​​of the other charging / discharging devices).

[0104] (14th Alternative Embodiment of the Invention) The battery capacity of the charge / discharge device may be used as the deterioration state of the charge / discharge device. In this case, if the cell capacity is high, it can be determined that degradation is not progressing in the fuel cell device 8 (the degradation state is determined to be low), and if the cell capacity is low, it can be determined that degradation is progressing in the fuel cell device 8 (the degradation state is determined to be high).

[0105] (15th Alternative Embodiment of the Invention) As the deterioration state of the charge / discharge device, the maximum input / output current of the charge / discharge device may be used as the deterioration state. In this case, if the maximum input / output current is high, it can be determined that degradation is not progressing in the fuel cell device 8 (the degradation state is determined to be low), and if the maximum input / output current is low, it can be determined that degradation is progressing in the fuel cell device 8 (the degradation state is determined to be high).

[0106] (16th Alternative Embodiment of the Invention) When a failure or error occurs in a charging / discharging device, values ​​weighted according to the importance of the location where the failure or error occurred may be accumulated (failure history), and the failure history may be used as the deterioration state. In this case, if the failure history is low, it can be determined that deterioration is not progressing in the charging / discharging device (the deterioration state is determined to be low), and if the failure history is high, it can be determined that deterioration is progressing in the charging / discharging device (the deterioration state is determined to be high).

[0107] When operating conditions under which a failure or error occurred in the past are stored, the possibility of a failure or error occurring increases if the current operating conditions are the same as those under which a failure or error occurred. As a result, a state in which the current operating conditions are the same as the operating conditions under which failures and errors occurred in the past can be added to the aforementioned failure history as a predicted value of the failure history, and this can be treated as a failure history representing a deteriorated state.

[0108] (17th Alternative Embodiment of the Invention) Among the battery capacity, charge / discharge efficiency, maximum input / output current, and failure history of the above-mentioned charging / discharging device, multiple pieces of data may be extracted, the extracted data may be weighted, and the sum of the weighted data may be used as the degradation state.

[0109] The configurations disclosed in the above embodiments (including alternative embodiments, the same applies below) can be applied in combination with configurations disclosed in other embodiments, unless a contradiction arises. Furthermore, the embodiments disclosed in this specification are illustrative, and the embodiments of the present invention are not limited thereto, and can be appropriately modified within the scope that does not deviate from the purpose of the present invention. [Industrial Applicability]

[0110] The present invention can be applied to a power management system capable of providing adjustment power. [Explanation of symbols]

[0111] 2 Management device 3. Facilities 5. Deterioration state detection section 7 Power system 8 Fuel cell device (power supply device) 9 Electric load device (electric load section) A1 Output power A2P Adjusting force A2M Adjusting force

Claims

1. A power supply management system including a power supply device installed in each of a plurality of facilities and capable of outputting electric power, and a management device capable of communicating with the plurality of power supply devices from outside the facilities, the power supply device is connected to the power grid in a state in which it can supply power to a power load, and in a state in which it can supply power to the power grid and from the power grid to the power load, a deterioration state detection unit that detects a deterioration state of each of the power supply devices; the management device receives a supply command for adjustment capacity, and performs a command transmission process of dividing an output request value of the received supply command into a plurality of parts based on the degradation state, allocating the divided parts to the plurality of power supply devices, and transmitting output control commands to the plurality of power supply devices that determine output power of the power supply devices according to the allocated values; The power supply device is a fuel cell device in which a power supply unit includes a fuel cell unit, When the management device issues a power receiving point power reduction command as the output control command to the plurality of fuel cell devices in order to reduce the power receiving point power of the facility, the allocation value of the fuel cell device whose degradation state is lower than the other fuel cell devices is increased more than the allocation values ​​of the other fuel cell devices; A power supply management system in which the deterioration state is determined by weighting multiple data items selected from the power generation output, power generation efficiency, difference between rated output and the power generation output, fuel consumption, temperature, cumulative power generation time, and failure history of the fuel cell device, and the sum of the multiple weighted data items.

2. A power management system comprising: a power supply device installed in each of a plurality of facilities and capable of outputting electric power; and a management device capable of communicating with the plurality of power supply devices from outside the facilities, the power supply device is connected to the power grid in a state in which it can supply power to a power load, and in a state in which it can supply power to the power grid and from the power grid to the power load, a deterioration state detection unit that detects a deterioration state of each of the power supply devices; the management device receives a supply command for adjustment capacity, and performs a command transmission process of dividing an output request value of the received supply command into a plurality of parts based on the degradation state, allocating the divided parts to the plurality of power supply devices, and transmitting output control commands to the plurality of power supply devices that determine output power of the power supply devices according to the allocated values; The power supply device is a fuel cell device in which a power supply unit includes a fuel cell unit, When the management device issues a power receiving point power increase command as the output control command to the plurality of fuel cell devices in order to increase the power receiving point power of the facility, the allocation value of the fuel cell device having a higher degradation state than the other fuel cell devices is increased more than the allocation values ​​of the other fuel cell devices; A power supply management system in which the deterioration state is determined by weighting multiple data items selected from the power generation output, power generation efficiency, difference between rated output and the power generation output, fuel consumption, temperature, cumulative power generation time, and failure history of the fuel cell device, and the sum of the multiple weighted data items.

3. A power supply management system comprising: a power supply device installed in each of a plurality of facilities and capable of outputting electric power; and a management device capable of communicating with the plurality of power supply devices from outside the facilities, the power supply device is connected to the power grid in a state in which it can supply power to a power load, and in a state in which it can supply power to the power grid and from the power grid to the power load, a deterioration state detection unit that detects a deterioration state of each of the power supply devices; the management device receives a supply command for adjustment capacity, and performs a command transmission process of dividing an output request value of the received supply command into a plurality of parts based on the degradation state, allocating the divided parts to the plurality of power supply devices, and transmitting output control commands to the plurality of power supply devices that determine output power of the power supply devices according to the allocated values; a power supply unit of the power supply device including a charging / discharging unit; When the management device issues a power receiving point power reduction command as the output control command to the plurality of charging / discharging devices in order to reduce the power receiving point power of the facility, the allocation value of the charging / discharging device whose degradation state is lower than that of the other charging / discharging devices is increased to be higher than the allocation values ​​of the other charging / discharging devices; A power management system in which the deterioration state is determined by weighting multiple data items selected from the battery capacity, charge / discharge efficiency, maximum input / output current, and failure history of the charging / discharging device, and the weighted state is the sum of the multiple data items.

4. A power management system comprising: a power supply device installed in each of a plurality of facilities and capable of outputting electric power; and a management device capable of communicating with the plurality of power supply devices from outside the facilities, the power supply device is connected to the power grid in a state in which it can supply power to a power load, and in a state in which it can supply power to the power grid and from the power grid to the power load, a deterioration state detection unit that detects a deterioration state of each of the power supply devices; the management device receives a supply command for adjustment capacity, and performs a command transmission process of dividing an output request value of the received supply command into a plurality of parts based on the degradation state, allocating the divided parts to the plurality of power supply devices, and transmitting output control commands to the plurality of power supply devices that determine output power of the power supply devices according to the allocated values; a power supply unit of the power supply device including a charging / discharging unit; When issuing a power receiving point power increase command as the output control command from the management device to the plurality of charging / discharging devices in order to increase the power receiving point power of the facility, the allocation value of the charging / discharging device whose degradation state is lower than that of the other charging / discharging devices is increased to be higher than the allocation values ​​of the other charging / discharging devices; A power management system in which the degradation state is determined by weighting multiple data items selected from the battery capacity, charge / discharge efficiency, maximum input / output current, and failure history of the charging / discharging device, and the weighted state is the sum of the multiple data items.

5. 5. The power management system according to claim 1, wherein the power supply devices include a power supply device whose power generation efficiency or charge / discharge efficiency decreases when the output power of the power supply device decreases.

Images