Control device, maintenance method and program

Abstract

To maintain a storage battery unit at an appropriate timing.SOLUTION: A control device is provided, comprising: a plurality of storage battery units that stabilize a power system; a power estimation unit that acquires an estimation value of a power amount generated by a power generation facility connected to the power system; and a schedule generation unit that generates a maintenance schedule of the plurality of storage battery units on the basis of the amount of power estimated by the power estimation unit. One or more pieces of regenerative energy power generation equipment is connected to the power system, and the power estimation unit may acquire the estimation value of the power generation amount of each of the regenerative energy power generation equipment.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a control device, a maintenance method, and a program.

[0002] BACKGROUND ART Conventionally, power stabilization systems that mitigate power fluctuations in power systems are known (see, for example, Patent Documents 1 to 3). Patent Document 1: JP 2018-161041 A Patent Document 2: JP 2019-115131 A Patent Document 3: JP 2018-38132 A Summary of the Invention [Problem to be solved by the invention]

[0003] It is preferable to be able to appropriately set the timing for maintenance of the battery units included in the power stabilizing system. [Means for solving the problem]

[0004] A first aspect of the present invention provides a control device that controls a maintenance schedule for a plurality of storage battery units that stabilize a power grid. The control device may include a power estimation unit that acquires an estimate of the amount of power generated by a power generation facility connected to the power grid. The control device may also include a schedule generation unit that generates a maintenance schedule for the plurality of storage battery units based on the amount of power estimated by the power estimation unit.

[0005] One or more renewable energy power generation devices may be connected to the power grid. The power estimation unit may obtain an estimate of the amount of power generated by the renewable energy power generation device.

[0006] The schedule generation unit may determine the number of storage battery units to be maintained in each period based on the estimated value for each period.

[0007] The schedule generation unit may generate a maintenance schedule for the plurality of battery units for each period based on a predicted demand for power for each period.

[0008] A thermal power plant may be connected to the power grid. The schedule generating unit may generate a maintenance schedule based on an estimated value of the amount of power generated by the thermal power plant.

[0009] The plurality of storage battery units may include one or more fluctuation-mitigating storage battery units that mitigate fluctuations in the amount of power generated by any of the renewable energy power generation devices. The schedule generation unit may generate a maintenance schedule for the corresponding fluctuation-mitigating storage battery unit based on an estimated value of the amount of power generated by the renewable energy power generation device.

[0010] The schedule generating unit may generate a maintenance schedule so that maintenance is performed on the corresponding fluctuation mitigating storage battery unit during a low power generation period when the estimated value of the amount of power generated in the renewable energy power generation device is equal to or less than a reference value.

[0011] The plurality of storage battery units may be associated with any of the renewable energy power generation apparatuses and may include one or more fluctuation-mitigating storage battery units that mitigate fluctuations in the amount of power generated by the corresponding renewable energy power generation apparatus. A decrease prohibition period may be set during which a decrease in the sum of the amount of power generated by the renewable energy power generation apparatus and the power supplied by the corresponding fluctuation-mitigating storage battery unit is prohibited. The schedule generation unit may generate a maintenance schedule so that maintenance of the fluctuation-mitigating storage battery unit is performed during periods other than the decrease prohibition period.

[0012] The plurality of battery units may include one or more fluctuation-mitigating battery units that are associated with any of the renewable energy power generation apparatuses and that mitigate fluctuations in the amount of power generated by the corresponding renewable energy power generation apparatus. The schedule generation unit may generate a maintenance schedule for the corresponding fluctuation-mitigating battery unit based on the magnitude of loss that would occur if maintenance were performed on the storage battery unit.

[0013] The control device may include a battery control unit that controls charging and discharging of the plurality of storage battery units. The battery control unit may control a target storage battery unit that is a maintenance target among the plurality of storage battery units so that the charge amount at the maintenance start timing satisfies a predetermined condition.

[0014] The battery control unit may control each of the two target battery units so that the charge amount of one of the target battery units is greater than a first threshold value at the maintenance start timing, and the charge amount of the other target battery unit is less than a second threshold value at the maintenance start timing.

[0015] The schedule generation unit may correct the number of storage battery units for which maintenance is to be performed based on the amount of power generated by the renewable energy power generation device at the maintenance start timing.

[0016] When the number of storage battery units for which maintenance is to be performed is reduced due to the correction, the schedule generation unit may select the storage battery units for which maintenance is to be performed based on the set priority order.

[0017] The schedule generation unit may select the storage battery unit for which maintenance is to be performed based on the amount of charge of the storage battery unit for which maintenance is planned at the time when maintenance is to be started.

[0018] The schedule generation unit may select a storage battery unit for which maintenance is to be performed based on the content of maintenance planned for each storage battery unit.

[0019] In a second aspect of the present invention, there is provided a maintenance method for a plurality of battery units that stabilizes a power grid. The maintenance method may include an estimation step of acquiring an estimate of an amount of power generated by a power generation facility connected to the power grid. The maintenance method may also include a schedule generation step of generating a maintenance schedule for the plurality of battery units based on the amount of power estimated in the estimation step.

[0020] In a third aspect of the present invention, there is provided a program for causing a computer to execute the maintenance method according to the second aspect.

[0021] The above summary of the invention does not list all of the necessary features of the present invention, and subcombinations of these features may also constitute inventions. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is a diagram illustrating an overview of a power system 100. [Figure 2] FIG. 2 is a diagram illustrating an example of the functional configuration of a control device 40. [Figure 3A] FIG. 10 is a diagram showing an example of an estimated value of the amount of power generated by the RE power generator 150-1. [Figure 3B] FIG. 10 is a diagram illustrating an example of a full charge capacity Emax_d. [Figure 3C] FIG. 10 is a diagram illustrating an example of a full charge capacity Emax_c. [Figure 4] 10 is a diagram showing an example of an estimated value of the amount of power generated by a thermal power generation facility 130. FIG. [Figure 5] FIG. 2 is a diagram showing an example of an estimated value of the amount of power demand in the power system 100. [Figure 6] FIG. 10 is a diagram illustrating an example of maintenance content. [Figure 7] FIG. 1 is a diagram illustrating an example of the configuration of a storage battery system 10. [Figure 8] FIG. 2 is a diagram illustrating another example of the configuration of the storage battery system 10. [Figure 9] FIG. 10 is a diagram showing an example of estimated and measured values ​​of the power generation amount of the RE power generator 150-1. [Figure 10] 10 is a flowchart showing an example of a maintenance method for a plurality of storage battery units 20 that stabilizes the power system 100. [Figure 11] 22 illustrates an example computer 2200 in which aspects of the maintenance method may be implemented in whole or in part. DETAILED DESCRIPTION OF THE INVENTION

[0023] The present invention will be described below through embodiments of the invention, but the following embodiments do not limit the scope of the invention according to the claims. Furthermore, not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0024] Fig. 1 is a diagram showing an overview of a power system 100. The power system 100 of this example includes a main power transmission system 110 and a control system 120. One or more power supply facilities that supply power to the main power transmission system 110 and one or more power demand facilities 140 that receive power from the main power transmission system 110 are connected to the main power transmission system 110. Although the main power transmission system 110 is schematically shown as a ring system in Fig. 1, the main power transmission system 110 is not limited to a ring system.

[0025] The control system 120 controls at least some of the power supply facilities connected to the main grid 110. For example, the control system 120 controls the amount of power supplied by each power supply facility in accordance with the amount of power demanded by the power demand facility 140. The control system 120 may be notified of information regarding the current amount of power supplied by each power supply facility. The control system 120 may also control the amount of active power and reactive power supplied by each power supply facility in order to stabilize the voltage, frequency, etc. in the main grid 110. The control system 120 may control each power supply facility via a control device or the like provided in each power supply facility.

[0026] Power demanding facility 140 is a facility provided with a load that consumes power. Power demanding facility 140 may refer to a facility provided in each building or facility such as a factory or building.

[0027] The power system 100 of this example includes, as power supply facilities, one or more thermal power plants 130, one or more renewable energy power generation plants (RE power generation plants 150), and one or more battery storage systems 10. The power system 100 may also include, as power supply facilities, various types of power generation facilities such as hydroelectric power plants, pumped storage power plants, and PPS (power producer / producer) power sources.

[0028] The thermal power plant 130 is a plant that consumes fuel such as oil, coal, or natural gas to generate electricity by thermal power. The total amount of power (kWh) supplied from one or more thermal power plant 130 to the power system 100 may be greater than the total amount of power supplied from other power supply plants. In another example, the total amount of power (kWh) supplied from one or more thermal power plant 130 to the power system 100 may be less than the total amount of power supplied from other power supply plants.

[0029] The RE power generation plant 150 is a plant that generates electricity using renewable energy (e.g., energy that can be used continuously, such as sunlight, wind, hydropower, geothermal, solar heat, biomass, etc.). The amount of renewable energy supplied to the RE power generation plant 150 varies depending on the surrounding environment, such as the weather. Therefore, the amount of power generated by the RE power generation plant 150 varies depending on the surrounding environment, such as the weather.

[0030] The battery storage system 10 is connected to a main transmission system 110 to stabilize the power grid 100. Stabilizing the power grid 100 means stabilizing the amount of power, power voltage, power frequency, etc. supplied from the power grid 100 to power demand facilities 140. For example, the battery storage system 10 is subjected to charge / discharge control to compensate for fluctuations in the amount of power generated by other power supply facilities.

[0031] The storage battery system 10 may be provided in association with the RE power generation plant 150, or may be provided independently of the RE power generation plant 150. In the example of FIG. 1 , the storage battery system 10-1 is provided in association with the RE power generation plant 150-1. The power system 100 may be provided with an RE power generation facility 170 including the RE power generation plant 150-1 and the storage battery system 10-1. The RE power generation facility 170 may include a transformer 160 that transforms the power from the RE power generation plant 150-1 and the storage battery system 10-1 and supplies the power to the main transmission grid 110.

[0032] The storage battery system 10-1 suppresses fluctuations in the amount of power supplied by the RE power generation facility 170 to the main grid 110. The storage battery system 10-1 of this example charges and discharges to compensate for fluctuations in the amount of power generated by the corresponding RE power generation device 150-1. For example, the storage battery system 10-1 charges with surplus power among the power generated by the RE power generation device 150-1, and when the power generated by the RE power generation device 150-1 is insufficient, discharges to compensate for the shortage.

[0033] The battery storage system 10-1 has one or more battery storage units 20 for mitigating fluctuations in the amount of power generated by the RE power generation device 150. Each battery storage unit 20 may include a battery 22 and a power converter 24 (PCS). The battery storage unit 22 may be, for example, a lead-acid battery or a lithium-ion battery, but is not limited to these. The power converter 24 converts the voltage and frequency of the power charged and discharged by the battery storage unit 22. For example, the power converter 24 converts the voltage and frequency characteristics of the power discharged by the battery storage unit 22 into characteristics specified by the control system 120 or the like. The power converter 24 may control the magnitude of the power charged and discharged by the battery storage unit 22.

[0034] The storage battery system 10-1 includes a control device 40. The control device 40 controls the charging and discharging of each storage battery unit 20. The control device 40 may control the charging and discharging of the storage battery units 20 based on at least one of the amount of power generated by the RE power generation device 150 and a command from the control system 120. The control device 40 may control the power converter 24 of the storage battery unit 20.

[0035] The power system 100 may include a storage battery system 10-2 that is independent of the RE power generation plant 150. The storage battery system 10-2 is controlled independently of the amount of power generated by the RE power generation plant 150. The storage battery system 10-2 may be controlled based on the amount of power supplied from the thermal power generation facility 130 to the main transmission grid 110. The configuration of the storage battery system 10-2 is similar to that of the storage battery system 10-1.

[0036] The characteristics of each storage battery unit 20 may fluctuate over time. For example, characteristics such as the full charge capacity of the storage battery unit 20 may deteriorate over time. For this reason, it is preferable that each storage battery unit 20 be maintained at predetermined intervals. Maintenance of the storage battery unit 20 refers to inspection of the electrical characteristics of the storage battery unit 20, inspection of the appearance of the storage battery unit 20, repair of the storage battery 22 or the power converter 24, replacement of the storage battery 22 or the power converter 24, etc.

[0037] If all the storage battery units 20 included in the storage battery system 10-1 are inspected at the same time, it becomes impossible to suppress fluctuations in the power supply from the RE power generation facility 170. On the other hand, the power grid 100 may require that the fluctuations in the power supply be kept below a certain level. Therefore, if all the storage battery units 20 are inspected at the same time, the RE power generation facility 170 will be unable to supply power to the main grid 110, and power generation at the RE power generation facility 170 will also stop.

[0038] Furthermore, if the storage battery units 20 included in the storage battery system 10-1 were inspected one by one in order, the battery capacity of the storage battery system 10-1 would be limited for a long period of time. The same applies to the storage battery system 10-2.

[0039] It is preferable to perform maintenance on the multiple storage battery units 20 included in the storage battery system 10 in as short a time as possible while minimizing the impact on power supply facilities such as the RE power generation facility 170. The control device 40 in this example generates a maintenance schedule for each storage battery unit 20. Instead of the control device 40, the control system 120 may generate the maintenance schedule.

[0040] FIG. 2 is a diagram illustrating an example of the functional configuration of the control device 40. The control device 40 may be a computer having programs for implementing each function installed therein. The control device 40 in this example generates a maintenance schedule for the multiple storage battery units 20 included in the storage battery system 10 so that the storage battery system 10 can maintain the full charge capacity that it should maintain. The full charge capacity that the storage battery system 10 should maintain is determined by the magnitude of fluctuations in the amount of power that the storage battery system 10 should compensate for. For example, the storage battery system 10-1 incorporated in the RE power generation facility 170 preferably maintains a full charge capacity that can compensate for a decrease in the amount of power generated by the RE power generation device 150-1. Furthermore, the storage battery system 10-2, which is independent of the RE power generation device 150, preferably maintains a full charge capacity that can compensate for a decrease in the amount of power supplied to the main grid 110.

[0041] The maximum amount by which the power generation amount of the RE power generation plant 150-1 can decrease varies depending on the magnitude of the power generation amount of the RE power generation plant 150-1. For example, the maximum amount by which the power generation amount of the RE power generation plant 150-1 can decrease is when the power generation amount of the RE power generation plant 150-1 decreases from its current value to zero. In other words, the greater the power generation amount of the RE power generation plant 150-1, the greater the amount of power that can decrease, so it is preferable for the storage battery system 10 to maintain a larger full charge capacity. The control device 40 generates a maintenance schedule that performs maintenance on more storage battery units 20 in the storage battery system 10-1 during periods when the power generation amount of the RE power generation plant 150-1 is smaller.

[0042] Note that the amount of power supplied to the main grid 110 fluctuates due to fluctuations in the amount of power generated by the RE power generation plant 150-2, etc. On the other hand, the amount of power generated by the thermal power generation facility 130 can be controlled by the amount of fuel input, etc. Therefore, by adjusting the amount of power generated by the thermal power generation facility 130, fluctuations in the amount of power supplied to the main grid 110 can be suppressed. The range of power generation that can be adjusted in the thermal power generation facility 130 becomes larger as the amount of power generated by the thermal power generation facility 130 increases, and also becomes larger as the number of thermal power generation facilities 130 increases. The storage battery system 10-2 only needs to cover the amount of fluctuation that cannot be compensated for by the thermal power generation facility 130, so the larger the power adjustment range in the thermal power generation facility 130, the smaller the full charge capacity that the storage battery system 10-2 must maintain. The control device 40 (or control system 120) generates a maintenance schedule that maintains more storage battery units 20 in the storage battery system 10-2 during periods when the amount of power generated by the thermal power generation equipment 130 is greater or when there are more thermal power generation equipment 130 in operation.

[0043] The control device 40 of this example has a planner 50 and a maintenance executor 60. The planner 50 generates a maintenance schedule for the multiple storage battery units 20 included in the storage battery system 10. The maintenance executor 60 performs maintenance on the multiple storage battery units 20 in accordance with the maintenance schedule.

[0044] The planning unit 50 has a power estimation unit 52, a required battery capacity calculation unit 54, a number of stopped units calculation unit 56, and a schedule generation unit 58. The power estimation unit 52 acquires an estimate of the amount of power generated by the power generation equipment connected to the main transmission grid 110. The estimate includes an estimate of the amount of power at a future time point. The power generation equipment connected to the main transmission grid 110 is, for example, a RE power generation device 150 or a thermal power generation equipment 130.

[0045] The power estimation unit 52 acquires an estimate of the future power generation amount of a power generation facility such as the RE power generation facility 150 or the thermal power generation facility 130. The power estimation unit 52 may calculate the estimate based on forecast data of environmental changes such as the amount of sunlight, wind power, temperature, and precipitation, and past actual data of the power generation amount of each power generation facility, or may acquire an externally generated estimate. The estimate of the future power generation amount of the power generation facility may also be calculated based on future power demand. Since the power generation amount of the thermal power generation facility 130 may be controlled according to the power demand, the future power generation amount of the thermal power generation facility 130 can be estimated from the future power demand. The power estimation unit 52 may acquire the estimate of the power generation amount or data for calculating the estimate from the power generation database 70. The power generation database 70 may accumulate data collected from each power generation facility, the control device 40, the control system 120, and the power demanding facility 140.

[0046] The required battery capacity calculation unit 54 calculates the full charge capacity that should be maintained by the battery storage system 10 based on the estimated value of the generated power estimated by the power estimation unit 52. The required battery capacity calculation unit 54 may calculate the full charge capacity that should be maintained in the future in chronological order.

[0047] For example, the required battery capacity calculation unit 54 calculates the full charge capacity that the battery storage system 10-1 should maintain in the future in a time series manner based on time series data of the future estimated value of the power generated by the RE power generation unit 150-1. The required battery capacity calculation unit 54 may use the estimated value of the power generated by the RE power generation unit 150-1 as the full charge capacity that the battery storage system 10-1 should maintain, or may use a value obtained by multiplying the estimated value by a predetermined coefficient (a coefficient greater than 0 and less than 1) as the full charge capacity that the battery storage system 10-1 should maintain.

[0048] Furthermore, the required battery capacity calculation unit 54 may time-series calculate the full charge capacity that the storage battery system 10-2 should maintain in the future based on time-series data of the future estimated value of the total power generation (or the number of operating units) of the thermal power generation equipment 130. The required battery capacity calculation unit 54 may evaluate the full charge capacity that the storage battery system 10-2 should maintain as smaller as the estimated value of the total power generation (or the number of operating units) of the thermal power generation equipment 130 is larger. The relationship between the estimated value and the full charge capacity may be set in advance.

[0049] The suspended unit number calculation unit 56 calculates the number of storage battery units 20 that can be shut down in the future based on the full charge capacity that the storage battery system 10 should maintain in the future. The suspended unit number calculation unit 56 may calculate time-series data of the number of storage battery units 20 that can be shut down in the future. The full charge capacity of each storage battery unit 20 may be the same. In this case, the suspended unit number calculation unit 56 calculates the number of storage battery units 20 that should be operated normally based on the value obtained by dividing the full charge capacity that the storage battery system 10 should maintain by the full charge capacity of one storage battery unit 20. The suspended unit number calculation unit 56 may calculate the number of storage battery units 20 that can be shut down by subtracting the number that should be operated normally from the number of storage battery units 20 included in the storage battery system 10. The number-of-suspended-units calculation unit 56 may calculate the number of storage battery units 20 that can be suspended based on a value obtained by dividing the full charge capacity that the storage battery system 10 should maintain by the average value of the full charge capacities of the multiple storage battery units 20. The number-of-suspended-units calculation unit 56 may calculate the number of storage battery units 20 that can be suspended based on a value obtained by dividing the full charge capacity that the storage battery system 10 should maintain by the maximum value of the full charge capacities of the multiple storage battery units 20.

[0050] The schedule generation unit 58 generates a future maintenance schedule for the multiple storage battery units 20 based on the number of storage battery units 20 that can be shut down at each future time period. The schedule generation unit 58 may generate the maintenance schedule so that the period during which the storage battery system 10 is maintained is as short as possible, on the condition that the number of storage battery units 20 to be maintained at each time period does not exceed the number of storage battery units 20 that can be shut down at each time period. This makes it possible to maintain the multiple storage battery units 20 while maintaining a full charge capacity that can compensate for fluctuations in the amount of power generated in the power generation facility.

[0051] The schedule generation unit 58 may generate a maintenance schedule that includes details of maintenance for each storage battery unit 20. Examples of maintenance details include inspecting the electrical characteristics of the storage battery unit 20, checking the operation of the storage battery unit 20 or the storage battery system 10 when a specific operation is performed on the storage battery unit 20, checking the deterioration of the entire storage battery 22 or the power converter 24 or its components, repairing the entire storage battery 22 or the power converter 24 or its components, and replacing the entire storage battery 22 or the power converter 24 or its components. These maintenance tasks involve shutting down the storage battery unit 20 or restricting its operation. The maintenance details may include tasks that can be performed while the storage battery unit 20 is operating normally. For example, the maintenance details may include inspecting the air conditioning in the electrical room where the storage battery system 10 is installed, checking the operation history of the storage battery system 10 (e.g., temperature, current, or voltage profiles) recorded by the control device 40, cleaning the equipment, etc.

[0052] The schedule generation unit 58 may register the generated maintenance schedule in the schedule database 80. The power generation database 70 and the schedule database 80 may be included in the control device 40, the control system 120, or may be provided in a server separate from these.

[0053] The maintenance execution unit 60 has a schedule reading unit 62, a preparation processing unit 64, a battery control unit 66, and a recovery processing unit 68. The schedule reading unit 62 reads a maintenance schedule from a schedule database 80 or the like. The schedule reading unit 62 may receive a notification from the schedule generation unit 58 or the schedule database 80 or the like that a corresponding maintenance schedule has been generated, and read the maintenance schedule in response to the notification.

[0054] The preparation processing unit 64 makes preparations for maintenance work based on the loaded maintenance schedule. For example, depending on the content of the maintenance, it may be necessary to prepare in advance measuring instruments for measuring electrical characteristics such as insulation resistance, replacement parts such as semiconductor chips, electrolyte for replenishing storage battery cells, etc. The preparation processing unit 64 may issue a notification to make these preparations. It is also preferable that the storage battery unit 20 to be maintained is stopped from operating and isolated from the power transmission line by the time the maintenance starts. The preparation processing unit 64 may control the storage battery system 10 to perform these processes.

[0055] The battery control unit 66 controls each storage battery unit 20 according to the maintenance content indicated in the maintenance schedule. For example, when detecting deterioration of a storage battery unit 20, the battery control unit 66 may charge and discharge the storage battery unit 20 and measure the time required for charging and discharging. The battery control unit 66 may control the transfer of power between the two storage battery units 20.

[0056] When the maintenance process for the storage battery unit 20 that is the maintenance target is completed, the restoration processing unit 68 reconnects the storage battery unit 20 to the power transmission line and restores it as part of the storage battery system 10. The restoration processing unit 68 may restore the storage battery units 20 sequentially each time the maintenance process for one or more storage battery units 20 is completed, or may collectively restore multiple storage battery units 20 that have undergone maintenance within a predetermined maintenance period.

[0057] FIG. 3A is a diagram showing an example of an estimated value of the amount of power generated by the RE power generation plant 150-1. The horizontal axis in FIG. 3A and other figures indicates future time (season). The amount of power generated by the RE power generation plant 150-1 varies depending on the surrounding environment, etc. The power estimation unit 52 may generate a time-series waveform of the estimated value as shown in FIG. 3A. The power estimation unit 52 may calculate an estimated value averaged over a predetermined unit period. The amount of power generated by the RE power generation plant 150-1 varies over a short period of time due to the influence of weather, etc., so it is difficult to accurately estimate fluctuations in the amount of power generated over a short period of time. In contrast, using an estimated value averaged over a predetermined unit period can reduce errors in the estimated value. The power estimation unit 52 may also calculate an estimated value of future power generation based on an average actual value obtained by averaging past amounts of power generated by the RE power generation plant 150-1 over a predetermined unit period.

[0058] The required battery capacity calculation unit 54 calculates the full charge capacity that the storage battery system 10-1 should maintain based on the estimated value of the power generation amount. The estimated value of the power generation amount may be an average value of the estimated values ​​over a predetermined averaging period. The required battery capacity calculation unit 54 calculates the full charge capacity that allows the storage battery system 10-1 to compensate for the fluctuation even if the power generation amount at a predetermined set timing suddenly drops from the estimated value to zero. In this example, the full charge capacity that the storage battery system 10-1 should maintain is calculated from a function or a table that uses the power generation amount of the RE power generation device 150-1 as an input. These functions or tables may include parameters for satisfying conditions set for the RE power generation facility 170, etc.

[0059] For example, the required battery capacity calculation unit 54 calculates the full charge capacity Emax_d to be maintained based on the function of equation (1).

number

[0060] As shown in equation (1), the estimated value P g From the power generation amount to 0, the preparation period T p If the battery can be reached within the specified time, the required full charge capacity Emax_d is P g 2 / 2r. Also, the preparation period T p If the power generation amount cannot reach 0 during the prohibited period T L Output at the start timing of g -rT p ) with the length of the ban period T L The value multiplied by is P g 2 / 2r is added.

[0061] In Equation 1, the estimated value P g In other examples, the full charge capacity Emax_d was calculated using a continuous function with the input P g Alternatively, a table may be used that takes the input value as an estimate value P g The full charge capacity Emax_d may be set discretely for each range.

[0062] Furthermore, the required battery capacity calculation unit 54 may calculate a full charge capacity Emax_c that allows the storage battery system 10-1 to charge the surplus power generation amount even when the output of the RE power generation plant 150-1 at a predetermined timing suddenly changes from an estimated value to a maximum value. The maximum value of the output may be the rated output at the connection point between the RE power generation facility 170 and the main transmission grid 110. In this case, the full charge capacity Emax_c that the storage battery system 10-1 should maintain is calculated from a function or a table that inputs the power generation amount of the RE power generation plant 150-1, as in the case of equation (1).

[0063] The required battery capacity calculation unit 54 may calculate at least one of the full charge capacities Emax_d and Emax_c. The required battery capacity calculation unit 54 may determine the larger of the full charge capacities Emax_d and Emax_c as the required full charge capacity Emax, or may determine the required full charge capacity Emax by performing predetermined processing on the full charge capacities Emax_d and Emax_c.

[0064] The number-of-units-to-be-suspended calculation unit 56 calculates the number of storage battery units 20 that can be suspended at each future time based on the full charge capacity that the storage battery system 10-1 should maintain. The schedule generation unit 58 generates a maintenance schedule based on the number of units calculated by the number-of-units-to-be-suspended calculation unit 56.

[0065] The schedule generation unit 58 may detect low power generation periods T1 and T2 in which the amount of power generated by the RE power generation device 150-1 or the full charge capacity that the storage battery system 10-1 should maintain falls below a predetermined reference value Th1. The schedule generation unit 58 may generate a maintenance schedule to perform maintenance on the storage battery units 20 during the detected low power generation periods T1 and T2. The schedule generation unit 58 may also generate a schedule to perform maintenance on the storage battery units 20 during the low power generation periods T1 and T2 that are longer than a predetermined threshold. The schedule generation unit 58 may also generate a schedule to perform maintenance on the storage battery units 20 during a period in which the number of storage battery units 20 that can be maintained at the same time is equal to or greater than a predetermined threshold number. This can improve maintenance efficiency.

[0066] Furthermore, a decrease prohibition period T0 may be set in which a decrease in the power supplied from the RE power generation facility 170 to the main grid 110 is prohibited. That is, during the decrease prohibition period T0, a decrease in the sum of the amount of power generated by the RE power generation facility 150-1 and the amount of power supplied from the storage battery system 10-1 is prohibited. The decrease prohibition period T0 is set in the control system 120, for example, by an administrator of the power system 100. It is preferable that the schedule generation unit 58 generates a maintenance schedule such that maintenance of the storage battery unit 20 is performed during periods other than the decrease prohibition period T0. This reduces the possibility of the storage battery system 10-1 running out of charge capacity during the decrease prohibition period T0.

[0067] Furthermore, the schedule generating unit 58 may generate a maintenance schedule so as to minimize an objective function indicating the loss (cost) caused by maintenance. The objective function F(x) is given by, for example, the following equation. F(x)=α×ΣT+β×Loss Here, ΣT denotes the total length (h) of the period during which the multiple storage battery units 20 of the storage battery system 10 are maintained. Loss denotes the power generation opportunity loss, indicating the amount of reduction in the amount of electricity sold (kWh) when maintenance is performed compared to when maintenance is not performed. α is a coefficient indicating the cost (yen / h) of labor, equipment, etc. incurred per unit maintenance period, and β is a coefficient indicating the price (yen / kWh) of unit electricity sold. The coefficient α may be a fixed coefficient regardless of the period, or may be a coefficient that varies depending on labor costs, etc. The coefficient β may be a fixed coefficient or may be a coefficient that varies depending on market prices. The total maintenance period ΣT may be the total length of the period during which at least one storage battery unit 20 is maintained. When multiple storage battery units 20 are maintained during the same period, the periods are not counted overlappingly. Furthermore, if the time between two maintenance periods T is shorter than a predetermined threshold, the period may be included in the maintenance period because costs are actually incurred during that period.

[0068] FIG. 3B is a diagram illustrating an example of the full charge capacity Emax_d. The horizontal axis of FIG. 3B represents the period, and the vertical axis represents the output of the RE power generation facility 170. Although FIG. 3B shows the output of the RE power generation facility 170 as (kW), the output of the RE power generation facility 170 may also be a value (kWh / h) obtained by dividing the amount of electric energy (kWh) by the length of a predetermined unit period (h). In this example, the RE power generation facility 170 is set with a preparation period, a prohibition period, and an open period for each period. The prohibition period is a period during which output fluctuations from the RE power generation facility 170 are prohibited. The preparation period is the period before the prohibition period, and the open period is the period after the prohibition period. During the preparation period and the open period, the output power of the RE power generation facility 170 can be varied at a rate of change r.

[0069] In this example, maintenance of the battery unit 20 is started at a predetermined maintenance start timing ts. Also, the estimated value of the output of the RE power generation plant 150-1 at the maintenance start timing ts is P g Let's say.

[0070] In this example, the required battery capacity calculation unit 54 calculates the full charge capacity Emax_d of the battery storage system 10-1 so that the conditions of the prohibited period, etc. are satisfied even if the output of the RE power generation plant 150-1 drops to 0 immediately after the maintenance start timing ts. The area of ​​the hatched portion in Figure 3B corresponds to the full charge capacity Emax_d.

[0071] During the preparation period and the open period, the storage battery system 10-1 controls the output of the RE power generation facility 170 to P g The maximum discharge amount of the battery system 10-1 during the preparation period and the open period is P g 2 is given by / 2r.

[0072] The preparation period from the maintenance start timing ts is T p If the prohibition period continues for a period of time equal to the length of time, the output power of the RE power generation facility 170 at the start timing of the prohibition period is P g -rT pDuring the prohibited period, the output of the RE power generation facility 170 must be maintained, so the maximum discharge amount of the storage battery system 10-1 during the prohibited period is (P g -rT p )T L Therefore, in this example, the full charge capacity Emax_d that the storage battery system 10-1 should have is expressed as P g 2 / 2r+(P g -rT p )T L This becomes:

[0073] If the output of the RE power generation facility 170 can be reduced to 0 during the preparation period, the amount of power generated by the battery system 10-1 during the prohibited period is 0. Therefore, as shown in equation (1), the full charge capacity Emax_d that the battery system 10-1 should have is expressed as P g 2 / 2r.

[0074] FIG. 3C is a diagram illustrating an example of the full charge capacity Emax_c. The axes and symbols in FIG. 3C are the same as those in the example in FIG. 3B. In this example, the required battery capacity calculation unit 54 calculates the full charge capacity Emax_c of the battery system 10-1 so that conditions such as the prohibition period can be satisfied even if the output of the RE power generation device 150-1 increases to the rated output Pd immediately after the maintenance start timing ts. The area of ​​the hatched portion in FIG. 3C corresponds to the full charge capacity Emax_c.

[0075] During the preparation period and the open period, the storage battery system 10-1 controls the output of the RE power generation facility 170 to P g From P d The output P of the RE power generating device 150-1 is increased at a rate of change r. d and the output of the RE power generation facility 170. Therefore, the maximum charge amount of the storage battery system 10-1 during the preparation period and the open period is (P d -P g ) 2 is given by / 2r.

[0076] The preparation period from the maintenance start timing ts is T p If the prohibition period continues for a period of time equal to the length of time, the output power of the RE power generation facility 170 at the start timing of the prohibition period is P g +rT p During the prohibited period, the output of the RE power generation facility 170 must be maintained, so the maximum charge amount of the storage battery system 10-1 during the prohibited period can be increased to (P d -(P g +rT p ))T L Therefore, in this example, the full charge capacity Emax_c that the storage battery system 10-1 should have is (P d -P g ) 2 / 2r+(P d -(P g +rT p ))T L This becomes:

[0077] During the preparation period, the output of the RE power generation facility 170 will be set at the rated output P d If the charge amount of the battery system 10-1 can be increased to 0 during the prohibited period, the charge amount of the battery system 10-1 is 0. Therefore, the full charge capacity Emax_d that the battery system 10-1 should have is expressed as follows: (P d -P g ) 2 / 2r.

[0078] The number-of-stopped-units calculation unit 56 may calculate the number of storage battery units 20 that can be stopped at the maintenance start timing ts based on at least one of the full charge capacity Emax_c and the full charge capacity Emax_d. If the storage battery system 10-1 does not satisfy the full charge capacity Emax_d, it may be unable to satisfy the output required of the RE power generation facility 170. However, even if the storage battery system 10-1 does not satisfy the full charge capacity Emax_c, the surplus power generation capacity of the RE power generation facility 150-1 may be discarded. The number-of-stopped-units calculation unit 56 may calculate the number of storage battery units 20 that can be stopped at the maintenance start timing ts so as to satisfy at least the condition of the full charge capacity Emax_d. The number-of-stopped-units calculation unit 56 may calculate the number of storage battery units 20 that can be stopped at the maintenance start timing ts based on the larger full charge capacity of the full charge capacity Emax_c and the full charge capacity Emax_d.

[0079] Furthermore, if a value smaller than the full charge capacity Emax_c is adopted as the full charge capacity Emax, there is a possibility that part of the surplus power generation capacity of the RE power generation plant 150-1 will be abandoned, as described above. On the other hand, if a larger full charge capacity Emax is adopted, the number of storage battery units 20 that can be maintained at one time will decrease. This will reduce the efficiency of maintenance work and increase maintenance costs. The stopped unit number calculation unit 56 may determine the full charge capacity Emax so as to minimize the loss due to the abandoned power generation capacity and the increase in maintenance costs.

[0080] FIG. 4 is a diagram showing an example of an estimated value of the power generation amount of the thermal power generation facility 130. The power generation amount of the thermal power generation facility 130 may fluctuate depending on the power demand. The power estimation unit 52 may generate a time-series waveform of the estimated value as shown in FIG. 4. The power estimation unit 52 may calculate an estimated value averaged over a predetermined unit period. The power estimation unit 52 may also calculate an estimated value of the future power generation amount based on an average actual value obtained by averaging the past power generation amount of the thermal power generation facility 130 over a predetermined unit period. In addition to the estimated value of the power generation amount shown in FIG. 4, or instead of the estimated value of the power generation amount, the power estimation unit 52 may generate an estimated value of the number of operating thermal power generation facilities 130. The number of operating thermal power generation facilities 130 can also be estimated from the power demand.

[0081] The required battery capacity calculation unit 54 calculates the full charge capacity that the storage battery system 10-1 should maintain based on the estimated value of the power generation amount. As described above, the thermal power generation facility 130 can adjust the power generation amount based on the amount of fuel input, etc. The adjustment range of the power generation amount by the thermal power generation facility 130 increases as the power generation amount of the thermal power generation facility 130 or the number of thermal power generation facilities 130 in operation increases. During a period when the adjustment range of the power generation amount by the thermal power generation facility 130 is large, the full charge capacity of the storage battery system 10-2 may be small. The relationship between the full charge capacity that the storage battery system 10-2 should maintain and the total power generation amount of the thermal power generation facilities 130 (or the number of operating units) may be preset in the required battery capacity calculation unit 54.

[0082] The number-of-units-to-be-suspended calculation unit 56 calculates the number of storage battery units 20 that can be suspended at each future time based on the full charge capacity that the storage battery system 10-2 should maintain. The schedule generation unit 58 generates a maintenance schedule based on the number of units calculated by the number-of-units-to-be-suspended calculation unit 56.

[0083] The schedule generating unit 58 may detect a high power generation period T3 in which the total power generation amount (or the number of operating units) of the thermal power generation facility 130 exceeds a predetermined reference value Th2. The schedule generating unit 58 may generate a maintenance schedule to perform maintenance on the storage battery units 20 during the detected high power generation period T3. The schedule generating unit 58 may also generate a schedule to perform maintenance on the storage battery units 20 during a period of the detected period that is longer than a predetermined threshold. The schedule generating unit 58 may also generate a schedule to perform maintenance on the storage battery units 20 during a period in which the number of storage battery units 20 that can be maintained in the same period is equal to or greater than a predetermined threshold number. This can improve the efficiency of maintenance.

[0084] FIG. 5 is a diagram showing an example of an estimated value of power demand in the power system 100. The power estimation unit 52 may generate a time-series waveform of the estimated value as shown in FIG. 5. The power estimation unit 52 may calculate an estimated value averaged over a predetermined unit period. The power estimation unit 52 may also calculate an estimated value of future power demand based on an average actual value obtained by averaging past power demands over a predetermined unit period. The power estimation unit 52 may use the estimated value of power demand as an estimated value of the power generation amount of the thermal power generation facility 130 described in FIG. 4. The power estimation unit 52 may calculate an estimated value of the power generation amount of the thermal power generation facility 130 by performing a predetermined calculation on the estimated value of power demand.

[0085] FIG. 6 is a diagram illustrating an example of maintenance content. In this example, deterioration of the storage battery units 20 is detected based on, for example, the charging time when the storage battery units 20 are charged by a predetermined amount. The preparation processing unit 64 and the battery control unit 66 may select storage battery unit 20-1 and storage battery unit 20-2 with the highest SOC from among the storage battery units 20 that are candidates for maintenance, and transfer power from storage battery unit 20-1 to storage battery unit 20-2. This makes it easy to detect deterioration of the storage battery units 20. The storage battery system 10 includes a switching unit 21 that disconnects the storage battery unit 20 to be maintained from an external system such as the RE power generation plant 150-1 or the main power grid 110.

[0086] The preparation processing unit 64 and the battery control unit 66 may control the charging and discharging of the storage battery units 20 that are designated as maintenance targets by the maintenance schedule so that the charge amount at the maintenance start timing satisfies a predetermined condition. The maintenance start timing may be the timing when the storage battery units 20 are disconnected from the external grid by the switching unit 21. For example, when the storage battery units 20-1 and 20-2 are designated as maintenance targets, the preparation processing unit 64 and the battery control unit 66 may control the charging and discharging of the respective storage battery units 20 so that the state of charge (SOC) of the storage battery unit 20-1 is greater than a first threshold value at the maintenance start timing and the state of charge of the storage battery unit 20-2 is less than a second threshold value at the maintenance start timing. Note that the first threshold value is greater than the second threshold value. This control may be performed during normal operation in which the storage battery units 20 are charged and discharged in cooperation with the RE power generation plant 150-1. By performing such pre-processing, maintenance of the storage battery units 20 can be performed efficiently.

[0087] 7 is a diagram showing an example of the configuration of a storage battery system 10. The storage battery system 10 of this example has a plurality of banks 17 and a plurality of switching units 21. Each bank 17 includes a plurality of storage battery units 20 and a transformer 19. A switching unit 21 is provided for each bank 17. The switching unit 21 switches whether or not the bank 17 is connected to an external system such as an RE power generation device 150 or a main transmission system 110.

[0088] In this example, the storage battery units 20 are maintained in units of banks 17. The control device 40 controls the switching unit 21 to disconnect the bank 17 to be maintained from the external system. The other banks 17 are connected to the external system. This allows the storage battery units 20 to be maintained in units of banks 17 while maintaining the functionality of the storage battery system 10.

[0089] 8 is a diagram showing another example of the configuration of the storage battery system 10. The storage battery system 10 of this example has a plurality of bus lines 26, a plurality of storage battery units 20, a plurality of switching units 23, and a plurality of switching units 21.

[0090] The switching unit 21 selects which bus line 26 each storage battery unit 20 is to be connected to. In the example of Fig. 8, storage battery units 20-1 and 20-2 are connected to bus line 26-1, and the other storage battery units 20 are connected to bus line 26-2.

[0091] The switching unit 23 selects which bus line 26 to connect to the external system and which bus line 26 to disconnect from the external system. In this example, the bus line 26-2 is connected to the external system, and the bus line 26-1 is disconnected from the external system. In other words, the bus line 26-1 functions as the bus line 26 for maintenance, and the bus line 26-2 functions as the bus line for normal operation.

[0092] The control device 40 controls the switching unit 21 to connect the storage battery unit 20 to be maintained to the bus line 26-1 and connect the other storage battery units 20 to the bus line 26-2. This allows any storage battery unit 20 to be selected and maintained while maintaining the functionality of the storage battery system 10.

[0093] Fig. 9 is a diagram showing an example of estimated and measured values ​​of the power generation amount of the RE power generation plant 150-1. In Fig. 9, the estimated values ​​of the power generation amount are the same as those in the example of Fig. 3A. The estimated values ​​are shown by dashed lines, and the measured values ​​are shown by solid lines. The dashed lines are omitted where the estimated values ​​and the measured values ​​are the same.

[0094] The schedule generating unit 58 may acquire the actual amount of power generated P1 of the RE power generation device 150-1 at a maintenance start timing Ts when maintenance is started by disconnecting one or more storage battery units 20 from the external grid. The schedule generating unit 58 may correct the number of storage battery units 20 for which maintenance is to be performed, based on the amount of power generated P1 at the maintenance start timing Ts.

[0095] For example, the amount of power generated P1 at the maintenance start timing Ts may be greater than the estimated amount of power generated at the maintenance start timing Ts. In this case, if the amount of power generated P1 is to be maintained, the full charge capacity that the storage battery system 10 must maintain after the maintenance start timing Ts may be greater than the required full charge capacity estimated when the maintenance schedule was generated. Therefore, if the storage battery units 20 are maintained according to the maintenance schedule, the full charge capacity of the storage battery system 10 may be insufficient, making it impossible to compensate for fluctuations in the amount of power generated by the RE power generation device 150-1. In this case, the schedule generation unit 58 may reduce the number of storage battery units 20 for which maintenance is performed.

[0096] If the number of storage battery units 20 to be maintained is not reduced, the amount of power generated by the RE power generation plant 150-1 may be reduced to the same amount as the estimated value. In this case, an opportunity loss for selling electricity occurs in the RE power generation plant 150-1. The schedule generation unit 58 may compare the opportunity loss with an increase in maintenance costs due to a reduction in the number of storage battery units 20 to be maintained, and determine whether to reduce the number of storage battery units 20 to be maintained.

[0097] When the number of storage battery units 20 to undergo maintenance is reduced due to the correction, the schedule generation unit 58 may select the storage battery units 20 to undergo maintenance on based on the set priority order. The priority order may be determined based on when the previous maintenance was performed, may be set by a user, or may be set based on other indicators.

[0098] The schedule generating unit 58 may select the storage battery units 20 for which maintenance is to be performed based on the charge amounts of the storage battery units 20 for which maintenance is planned at the maintenance start timing ts. For example, the schedule generating unit 58 may prioritize the selection of storage battery units 20 for which maintenance is planned, with a higher charge amount and a lower charge amount. This allows the maintenance described in FIG. 6 to be performed efficiently. More specifically, when selecting N storage battery units 20, the schedule generating unit 58 may select N / 2 storage battery units 20 with a higher charge amount and N / 2 storage battery units 20 with a lower charge amount.

[0099] Furthermore, when the number of storage battery units 20 to undergo maintenance is reduced due to a correction, the schedule generating unit 58 may select storage battery units 20 to undergo maintenance based on the content of maintenance planned for each storage battery unit 20. For example, the schedule generating unit 58 may preferentially select storage battery units 20 to undergo maintenance that requires advance preparation, such as preparation of measuring equipment or replacement parts. The storage battery units 20 with the maintenance content to be preferentially selected may be determined by the schedule generating unit 58 when generating the maintenance schedule.

[0100] Fig. 10 is a flowchart showing an example of a maintenance method for a plurality of storage battery units 20 that stabilizes the power system 100. An overview of the maintenance method will be described in Fig. 10. The details of the maintenance method are similar to the operation of the control device 40 (or control system 120) described in Figs. 1 to 9.

[0101] First, in estimation step S1002, an estimate of the amount of power generated by the power generation equipment connected to the power grid 100 is obtained. Next, in required battery capacity calculation step S1004, the magnitude of the full charge capacity that the storage battery system 10 should maintain is calculated based on the above-mentioned estimate. Next, in number of stopped units calculation step S1006, the number of storage battery units 20 that can be stopped in the storage battery system 10 is calculated based on the above-mentioned required full charge capacity. Next, in schedule generation step S1008, a maintenance schedule for the multiple storage battery units 20 is generated based on the above-mentioned number of units that can be stopped.

[0102] Next, in preparation step S1010, preparations necessary for the maintenance work indicated in the maintenance schedule are made. Also, in measurement acquisition step S1012, measurements of the power generation amount of the RE power generation plant 150-1 at the maintenance start timing are acquired. Next, in number determination step S1014, it is determined whether correction of the number of storage battery units 20 to be maintained is necessary. If correction is not necessary (n), the maintenance planned in the maintenance schedule is carried out.

[0103] If the number of storage battery units 20 to be maintained decreases (y), the priority of the storage battery units 20 for which maintenance was planned is determined (S1015). The priority may be determined based on the charge amount of the storage battery units 20 or the maintenance content, as described in FIG. 9. Next, in a target determination step S1016, the storage battery units 20 to be actually maintained are determined based on the priority.

[0104] Next, in a maintenance step S1018, maintenance is performed on the storage battery unit 20. In a recovery step S1020, the storage battery unit 20 for which maintenance has been completed is restored to normal operation.

[0105] 11 shows an example of a computer 2200 in which aspects of the maintenance method may be implemented in whole or in part. A program is installed on the computer 2200 to cause the computer 2200 to execute the maintenance method described in FIGS. 1 to 10.

[0106] A program installed on the computer 2200 can cause the computer 2200 to function as or perform operations associated with an apparatus or one or more sections of the apparatus according to an embodiment of the present invention, and / or can cause the computer 2200 to perform a method or steps of a method according to an embodiment of the present invention. Such a program can be executed by the CPU 2212 to cause the computer 2200 to perform specific operations associated with some or all of the blocks of the flowcharts and block diagrams described herein.

[0107] A computer 2200 according to this embodiment includes a CPU 2212, a RAM 2214, a graphics controller 2216, and a display device 2218, which are interconnected by a host controller 2210. The computer 2200 also includes input / output units such as a communication interface 2222, a hard disk drive 2224, a DVD-ROM drive 2226, and an IC card drive, which are connected to the host controller 2210 via an input / output controller 2220. The computer also includes legacy input / output units such as a ROM 2230 and a keyboard 2242, which are connected to the input / output controller 2220 via an input / output chip 2240.

[0108] The CPU 2212 operates according to programs stored in the ROM 2230 and RAM 2214, thereby controlling each unit. The graphics controller 2216 acquires image data generated by the CPU 2212 into a frame buffer or the like provided in the RAM 2214 or into the graphics controller 2216 itself, and causes the image data to be displayed on the display device 2218.

[0109] The communication interface 2222 communicates with other electronic devices via a network. The hard disk drive 2224 stores programs and data used by the CPU 2212 in the computer 2200. The DVD-ROM drive 2226 reads programs or data from the DVD-ROM 2201 and provides the programs or data to the hard disk drive 2224 via the RAM 2214. The IC card drive reads programs and data from an IC card and / or writes programs and data to an IC card.

[0110] The ROM 2230 stores therein a boot program or the like that is executed by the computer 2200 upon activation, and / or programs that depend on the hardware of the computer 2200. The input / output chip 2240 may also connect various input / output units to the input / output controller 2220 via a parallel port, a serial port, a keyboard port, a mouse port, etc.

[0111] The programs are provided by a computer-readable medium such as a DVD-ROM 2201 or an IC card. The programs are read from the computer-readable medium, installed in the hard disk drive 2224, RAM 2214, or ROM 2230, which are also examples of computer-readable media, and executed by the CPU 2212. Information processing described in these programs is read by the computer 2200, and brings about cooperation between the programs and the various types of hardware resources described above. An apparatus or method may be configured by realizing information manipulation or processing in accordance with the use of the computer 2200.

[0112] For example, when communication is performed between the computer 2200 and an external device, the CPU 2212 may execute a communication program loaded into the RAM 2214 and instruct the communication interface 2222 to perform communication processing based on the processing described in the communication program. Under the control of the CPU 2212, the communication interface 2222 reads transmission data stored in a transmission buffer processing area provided in the RAM 2214, the hard disk drive 2224, the DVD-ROM 2201, or a recording medium such as an IC card, and transmits the read transmission data to the network, or writes reception data received from the network to a reception buffer processing area or the like provided on the recording medium.

[0113] The CPU 2212 may also cause all or a necessary portion of a file or database stored on an external recording medium such as the hard disk drive 2224, the DVD-ROM drive 2226 (DVD-ROM 2201), an IC card, etc. to be read into the RAM 2214, and perform various types of processing on the data on the RAM 2214. The CPU 2212 then writes back the processed data to the external recording medium.

[0114] Various types of information, such as various types of programs, data, tables, and databases, may be stored on the recording medium and may undergo information processing. The CPU 2212 may perform various types of processing on data read from the RAM 2214, including various types of operations, information processing, conditional judgment, conditional branching, unconditional branching, information search / replacement, etc., as described throughout this disclosure and specified by the instruction sequences of the programs, and write the results back to the RAM 2214. The CPU 2212 may also search for information in a file, database, etc. on the recording medium. For example, if multiple entries each having an attribute value of a first attribute associated with an attribute value of a second attribute are stored on the recording medium, the CPU 2212 may search for an entry that matches a condition specified by the attribute value of the first attribute from among the multiple entries, read the attribute value of the second attribute stored in the entry, and thereby obtain the attribute value of the second attribute associated with the first attribute that satisfies a predetermined condition.

[0115] The above-described programs or software modules may be stored in a computer-readable medium on or near the computer 2200. A recording medium such as a hard disk or RAM provided in a server system connected to a dedicated communication network or the Internet can also be used as a computer-readable medium, thereby providing the programs to the computer 2200 via the network.

[0116] Although the present invention has been described above using embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications and improvements can be made to the above embodiments. It is clear from the claims that such modifications and improvements can also be included within the technical scope of the present invention.

[0117] It should be noted that the execution order of each process, such as operations, procedures, steps, and stages, in the devices, systems, programs, and methods shown in the claims, specifications, and drawings is not specifically stated as "before," "prior to," etc., and that the processes can be performed in any order unless the output of a previous process is used in a subsequent process. Even if the operational flow in the claims, specifications, and drawings is described using "first," "next," etc. for convenience, this does not mean that the processes must be performed in this order. [Explanation of symbols]

[0118] 10... Battery system, 17... Bank, 19... Transformer, 20... Battery unit, 21... Switching unit, 22... Battery, 23... Switching unit, 24... Power converter, 26... Bus line, 40... Control device, 50... Planning unit, 52... Power estimation unit, 54... Required battery capacity calculation unit, 56... Number of stopped units calculation unit, 58... Schedule generation unit, 60... Maintenance execution unit 62 Schedule reading unit, 64 Preparation processing unit, 66 Battery control unit, 68 Recovery processing unit, 70 Power generation database, 80 Schedule database, 100 Power system, 110 Main transmission system, 120 Control system, 130 Thermal power generation facility, 140 Power demand facility, 150 RE power generation equipment, 160 Transformer, 170 RE power generation facility

Claims

1. A control device that controls a maintenance schedule for a plurality of storage battery units that stabilize a power system, a power estimation unit that acquires an estimate of the amount of power generated by a power generation facility connected to the power grid; a schedule generation unit that generates a maintenance schedule for the plurality of storage battery units based on the amount of power estimated by the power estimation unit; A control device comprising:

2. One or more renewable energy power generation devices are connected to the power grid; The power estimation unit acquires the estimated value of the amount of power generated by the renewable energy power generation device. The control device according to claim 1 .

3. The schedule generation unit determines the number of storage battery units to be maintained in each period based on the estimated value in each period. The control device according to claim 1 or 2.

4. The schedule generation unit generates a maintenance schedule for the plurality of battery units for each period based on a power demand forecast for the period. The control device according to any one of claims 1 to 3.

5. a thermal power generation facility is connected to the power system, The schedule generation unit generates the maintenance schedule based on the estimated value of the amount of power generated by the thermal power generation facility. The control device according to claim 4.

6. the plurality of storage battery units include one or more fluctuation-mitigating storage battery units that mitigate fluctuations in the amount of power generated by any of the renewable energy power generation devices, The schedule generation unit generates the maintenance schedule for the corresponding storage battery unit for fluctuation mitigation based on the estimated value of the amount of power generated in the renewable energy power generation device. The control device according to claim 2 .

7. The schedule generation unit generates the maintenance schedule so that maintenance of the corresponding storage battery unit for fluctuation mitigation is performed during a low power generation period in which the estimated value of the amount of power generated in the renewable energy power generation device is equal to or less than a reference value. The control device according to claim 6.

8. the plurality of storage battery units include one or more fluctuation-mitigating storage battery units that are associated with any of the renewable energy power generation apparatuses and that mitigate fluctuations in the amount of power generated by the corresponding renewable energy power generation apparatus; a reduction prohibition period is set during which a sum of the power generation amount of the renewable energy power generation device and the supply power of the corresponding storage battery unit for fluctuation mitigation is prohibited from decreasing, The schedule generation unit generates the maintenance schedule so that maintenance of the fluctuation mitigation storage battery unit is performed during a period other than the decrease prohibition period. The control device according to claim 2 .

9. the plurality of storage battery units include one or more fluctuation-mitigating storage battery units that are associated with any of the renewable energy power generation apparatuses and that mitigate fluctuations in the amount of power generated by the corresponding renewable energy power generation apparatus; The schedule generation unit generates the maintenance schedule for the corresponding storage battery unit for fluctuation mitigation based on the magnitude of loss when the storage battery unit is maintained. The control device according to claim 2 .

10. a battery control unit that controls charging and discharging of the plurality of storage battery units; The battery control unit controls a target storage battery unit that is a maintenance target among the plurality of storage battery units so that a charge amount of the target storage battery unit at a maintenance start timing satisfies a predetermined condition. A control device according to any one of claims 1 to 9.

11. The battery control unit controls each of the two target battery units so that the charge amount of one of the target battery units becomes greater than a first threshold value at the maintenance start timing, and the charge amount of the other target battery unit becomes smaller than a second threshold value at the maintenance start timing. The control device according to claim 10.

12. The schedule generation unit corrects the number of storage battery units for which maintenance is to be performed based on the amount of power generated by the renewable energy power generation device at a maintenance start timing. The control device according to claim 2 .

13. When the number of the storage battery units to be subjected to maintenance is reduced due to the correction, the schedule generation unit selects the storage battery units to be subjected to maintenance based on a set priority order. The control device according to claim 12.

14. The schedule generation unit selects the storage battery unit for which maintenance is to be performed based on the amount of charge of the storage battery unit for which maintenance is planned at the maintenance start timing. The control device according to claim 13.

15. The schedule generation unit selects the storage battery unit on which maintenance is to be performed based on the content of maintenance planned for each storage battery unit. The control device according to claim 13.

16. A maintenance method for a plurality of storage battery units that stabilizes a power system, comprising: an estimation step of acquiring an estimate of an amount of power generated by a power generation facility connected to the power grid; a schedule generation step of generating a maintenance schedule for the plurality of storage battery units based on the amount of power estimated in the estimation step; A maintenance method comprising:

17. A program for causing a computer to execute the maintenance method according to claim 16.

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