Storage battery management device and storage battery management method

Abstract

To perform efficient storage battery management.SOLUTION: A storage battery management device comprises a utilization schedule creation section 112 for creating a schedule of charge or discharge of a storage battery satisfying a predetermined condition with respect to a request of storage battery utilization including a power amount by referring to a storage battery information database 210 storing information on the storage battery including a charging rate, an adaptable application database 240 storing the type of the request of storage battery utilization to which the storage battery is adaptable, a connection information database 250 storing connection information indicating a connection relation between the storage battery and a node, and a cost information database 260 storing information on a cost including at least one of a power conversion cost and a congestion price and a predetermined condition relating to the cost.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a battery management device and a battery management method for managing charging and discharging of a battery connected to a power transmission and distribution network. [Background technology]

[0002] In order to keep frequency and voltage fluctuations within a certain tolerance range, secondary battery energy storage systems (Battery Energy Storage Systems, hereafter also referred to as storage batteries) are used in the power transmission and distribution grid. Furthermore, as the need for storage batteries increases with the increase in power sources that use renewable energy such as solar power generation and wind power generation, there is a demand for efficient use of storage batteries.

[0003] A storage battery sharing system described in Patent Document 1 is a technology for managing storage battery usage. This storage battery sharing system manages multiple consumers connected to the distribution network of a power system and manages the usage schedule of storage batteries shared by the multiple consumers, and includes a storage battery schedule creation unit that creates a storage battery schedule including instructions for charging and discharging the storage battery based on storage battery information, storage battery usage plans, distribution network information, power loss information, and contract information, and a storage battery control command unit that gives the storage battery schedule or a control command created based on the storage battery schedule to the storage battery, and manages the amount of electricity stored in the storage battery and also manages owners who have the right to use the amount of electricity stored. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-040970 A Summary of the Invention [Problem to be solved by the invention]

[0005] The battery sharing system described in Patent Document 1 can create a battery schedule with little power loss, but does not take into account power transmission congestion, which can lead to high operating costs. The present invention has been made in view of the above background, and an object of the present invention is to provide a storage battery management device and a storage battery management method that enable efficient storage battery management. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the battery management device of the present invention includes a battery information database that stores information about the battery including the charging rate, a compatible application database that stores the types of battery utilization requests that the battery can handle, a connection information database that stores connection information that indicates the connection relationship between the battery and a node, and a cost information database that stores cost information including at least one of power conversion costs and congestion charges, and specified conditions related to the costs, and includes a usage schedule creation unit that creates a charging or discharging schedule for the battery that satisfies the specified conditions in response to a request for battery utilization that includes the amount of power. Effect of the Invention

[0007] According to the present invention, it is possible to provide a storage battery management device and a storage battery management method that enable efficient storage battery management. Problems, configurations, and effects other than those described above will become apparent from the following description of the embodiments. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing a configuration of a power transmission and distribution network according to an embodiment of the present invention. [Diagram 2] 4 is a graph showing fluctuations in voltage or frequency according to the present embodiment. [Diagram 3] 1 is a functional block diagram of a battery management device according to an embodiment of the present invention. [Figure 4] 4 is a diagram showing a data configuration of a storage battery information database according to the embodiment. FIG. [Diagram 5]FIG. 4 is a diagram showing a data configuration of a node information database according to the embodiment. [Figure 6] 5 is a diagram showing a data configuration of a distance information database according to the embodiment. FIG. [Figure 7] FIG. 4 is a diagram showing a data configuration of a compatible application database according to the embodiment. [Figure 8] 5 is a diagram showing a data configuration of a connection information database according to the embodiment. FIG. [Figure 9] FIG. 2 is a diagram showing a data configuration of congestion charge data according to the embodiment. [Figure 10] FIG. 11 is a diagram showing a data configuration of an application cost according to the embodiment. [Figure 11] 10 is a flowchart of a storage battery usage schedule creation process according to the present embodiment. [Figure 12] 10 is a flowchart of a storage battery usage schedule creation process according to the present embodiment. [Figure 13] 4 is a flowchart of a storage battery recovery schedule creation process according to the embodiment. [Figure 14] FIG. 4 is a diagram showing storage battery control schedule information according to the embodiment. [Figure 15] FIG. 11 is a diagram showing virtual battery state information according to the embodiment. [Figure 16] FIG. 4 is a diagram showing storage battery charging rate information according to the embodiment; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] <Outline of the power transmission and distribution network> Before describing the battery management device 100 (see FIG. 3 described later), an overview of the power transmission and distribution network will be described. FIG. 1 is a diagram showing the configuration of a power transmission and distribution network 440 according to this embodiment. The power transmission and distribution network 440 is a network in which a substation 448 and nodes 441-443 are connected by power lines. In addition to storage batteries 411-416, power sources 421-423 such as solar power generation facilities and wind power generation facilities are connected to the nodes 441-443.

[0010] The frequency and voltage of the electricity transmitted and distributed are periodically measured at the substation 448 and the nodes 441 to 443. The measured values ​​are transmitted to the electricity transmission and distribution network management system 480 via node monitoring devices 490 (see FIG. 3, which will be described later) installed at each of the nodes 441 to 443. In addition, the charging rates, temperatures, etc. of the storage batteries 411-416 are periodically measured. The measured values ​​are transmitted to the storage battery monitoring system 460 via a storage battery monitoring device 470 (see FIG. 3, which will be described later) installed for each of the storage batteries 411-416.

[0011] <Battery Management Device Overview> An overview of the battery management device 100 according to this embodiment (see FIG. 3) will be described with reference to FIG. 2, which will be described later. FIG. 2 is a graph 710 showing the voltage or frequency fluctuation according to this embodiment. The voltage and frequency fluctuation in the power transmission and distribution network 440 is required to fall within an allowable range between a predetermined upper limit value and a predetermined lower limit value.

[0012] When the voltage or frequency falls below the lower limit, the storage battery management device 100 selects a battery to be discharged from among the storage batteries 411-416 and instructs the battery to be discharged (see period 712). When the voltage or frequency exceeds the upper limit, the storage battery management device 100 selects a battery to be charged from among the storage batteries 411-416 and instructs the battery to be charged (see period 714). When the voltage and frequency return to within the allowable range, the storage battery management device 100 instructs the battery with a small amount of stored power to be charged, and instructs the battery with a large amount of stored power to be discharged (see periods 711, 713, and 715). The periods 712 and 714 are also called adjustment phases. The periods 711, 713, and 715 are also called recovery phases. In addition, the storage battery management device 100 instructs the storage batteries 411-416 to charge or discharge depending on the load of the power transmission and distribution network 440. For example, when the amount of power generated by the power sources 421-423 is large, the storage battery management device 100 instructs charging.

[0013] The battery management device 100 selects a battery connected to a node with a low congestion charge among the nodes 441 to 443. When charging or discharging with a voltage outside the allowable range, the battery management device 100 selects a battery connected to a node close to the substation 448. In this way, the battery management device 100 can use the batteries 411-416 while reducing costs, including congestion charges (see FIG. 9, which will be described later), and manages the batteries 411-416 efficiently.

[0014] Below, we will explain congestion charges. When an increase in renewable energy sources causes the transmission power of a part of the power grid to exceed its transmission capacity, it becomes impossible to send all of the generated electricity to the grid. This state is called grid congestion. Congestion charges are set according to the state of grid congestion. Congestion charges are fees to prevent or suppress grid congestion, and are set higher the higher the level of grid congestion is expected to be.

[0015] <Configuration of the battery management device> 3 is a functional block diagram of the battery management device 100 according to this embodiment. The battery management device 100 is a computer, and includes a control unit 110, a storage unit 120, and an input / output unit 180. User interface devices such as a display, keyboard, and mouse are connected to the input / output unit 180. The input / output unit 180 includes a communication device, and is capable of transmitting and receiving data to and from a battery monitoring system 460 and a power transmission and distribution network management system 480.

[0016] The battery monitoring system 460 transmits information such as the charging rates and temperatures of the batteries 411-416 (see FIG. 1) received from the battery monitoring device 470 to the battery management device 100. The battery management device 100 also transmits control messages for the batteries 411-416 to the battery monitoring device 470 via the battery monitoring system 460 to instruct charging or discharging. The power transmission and distribution network management system 480 transmits information (node ​​information) such as frequency and voltage at the nodes 441-443 received from the node monitoring device 490 to the battery management device 100. The power transmission and distribution network management system 480 also transmits a utilization request (application request) of the batteries 411-416 to the battery management device 100 in order to stabilize the power transmission and distribution network 440. The application request includes application identification information described below and power amount as a parameter. The battery management device 100 instructs the batteries 411-416 to charge or discharge in response to the utilization request.

[0017] ≪Storage battery management device: Storage section≫ The storage unit 120 includes storage devices such as a read only memory (ROM), a random access memory (RAM), a solid state drive (SSD), etc. The storage unit 120 stores a battery information database 210, a node information database 220, a distance information database 230, a compatible application database 240, a connection information database 250, a cost information database 260, and a program 128. The program 128 includes descriptions of procedures for a storage battery usage schedule creation process (see Figs. 11 and 12 described later) and a storage battery recovery schedule creation process (see Fig. 13 described later).

[0018] <Memory section: Battery information database> Fig. 4 is a diagram showing a data configuration of the storage battery information database 210 according to this embodiment. The storage battery information database 210 is, for example, data in a table format. One row (record) indicates information related to each storage battery 411-416, and includes columns (attributes) of identification information (denoted as "ID" in Fig. 4), update date and time, type, response time, rated power, charging rate, upper and lower limits of charging rate, charge and discharge efficiency, capacity degradation, storage capacity, temperature, position, distance, contract period, contract amount, and status. The storage battery information database 210 may include attributes different from the attributes described above.

[0019] The update date and time indicates the date and time when the record was updated. Note that in Figure 4, only the time is listed. The type indicates the type of storage battery, such as lithium ion, nickel metal hydride, and lead. The response time indicates the response time (seconds) of the storage battery. The rated power indicates the rated power (kW) of the storage battery.

[0020] The charging rate (%) indicates the charging rate (SoC, State of Charge) of the storage battery at the update date and time. The upper and lower limits of the charging rate indicate the upper and lower limits of the charging rate set for the operation of the storage battery. The storage battery is charged so as not to exceed the upper limit, and discharged so as not to exceed (or fall below) the lower limit. The charge / discharge efficiency indicates the efficiency (%) of charging and discharging. Capacity degradation indicates the ratio (%) of the maximum capacity at the time of update to the capacity at the start of use. Capacity degradation decreases as the stored electricity is used.

[0021] The storage capacity indicates the capacity (kWh) of the storage battery at the time of update. The temperature indicates the temperature of the storage battery (°C). The location indicates the location of the storage battery, for example, by latitude and longitude. Distance indicates the distance (km) to the substation 448 in terms of the length of the power line. The contract period indicates the length of time (e.g., days) after the conclusion of the storage battery usage contract. The contract amount indicates the contract amount for the storage battery (yen / kW). The status indicates the state of the battery at the time of the update. Possible states are Used (Discharging), Idle, and Recovered (Charging).

[0022] <Memory section: Node information database> 5 is a diagram showing the data configuration of the node information database 220 according to this embodiment. The node information database 220 is, for example, data in a table format. One row (record) indicates information related to each of the nodes 441 to 443, and includes columns (attributes) of identification information (denoted as "ID" in FIG. 5), area, substation, position, voltage, and frequency.

[0023] The area indicates identification information of the area to which the node belongs. The substation indicates the identity of the substation 448 to which the node is connected. The location indicates the location of the node, for example, by latitude and longitude. Voltage refers to the voltage in units of electricity (pu) flowing through the power line at the node. The frequency indicates the frequency (Hz) of the electricity flowing through the power line at the node. The records of the node information database 220 include the phase angle of the electricity flowing through the power line, the active power flow, the reactive power flow, the admittance, the impedance angle, etc., which are not shown.

[0024] <Memory section: distance information database> FIG. 6 is a diagram showing the data configuration of the distance information database 230 according to this embodiment. The distance information database 230 is, for example, data in a table format. One row (record) indicates the distance (km) from a substation to each node. FIG. 6 shows that the distance on the power line from a substation identified by identification information "SL001" to a node identified by identification information "L001" is 1.4 km. Note that "∞" indicates that the node is not connected to a substation. For example, a node identified by identification information "L004" is not connected to a substation identified by identification information "SL001".

[0025] <Memory section: Compatible application database> FIG. 7 is a diagram showing the data configuration of the compatible application database 240 according to this embodiment. The compatible application database 240 is, for example, data in a table format. One row (record) indicates an application (use, purpose) compatible with the storage battery. Application types include primary frequency control, black start, secondary frequency control, voltage regulation, tertiary frequency control, congestion control, peak shaving, and renewable energy stabilization. According to FIG. 7, for example, a storage battery identified by identification information "B002" is compatible with an application identified by identification information "A11", but is not compatible with an application identified by identification information "A12".

[0026] <Memory section: Connection information database> Fig. 8 is a diagram showing a data configuration of the connection information database 250 according to this embodiment. The connection information database 250 stores information, for example in a table format, that indicates the connection relationships between the storage batteries 411-416 and the nodes 441-443. According to Fig. 8, for example, a storage battery identified by identification information "B001" and a storage battery identified by identification information "B002" are connected to a node identified by identification information "L001".

[0027] <Memory section: Expense information database> The cost information database 260 stores congestion charge data 261 (see FIG. 9 described later), application cost 266 (see FIG. 10 described later), and wheeling charge (not shown). The cost information database 260 also stores conditions (cost standards, predetermined conditions) related to costs for responding to application requests. The conditions are, for example, the type of application request, parameters (amount of power) included in the application request, and an upper limit of costs according to the time period in which the request is made. The conditions may be, for example, the amount of power to be restored (charged) in the recovery phase (see periods 711, 713, and 715 in FIG. 2) and an upper limit of costs according to the time period. The conditions may also be an upper limit for each cost (cost item) such as congestion charge, power conversion cost (see FIG. 10 described later), and wheeling charge.

[0028] FIG. 9 is a diagram showing the data configuration of congestion charge data 261 according to this embodiment. The congestion charge data 261 is, for example, data in a table format. One row (record) indicates a charge at a future point in time to be charged when passing electricity through a node. The charge is set based on the predicted weather, wind speed, temperature, and the like. As described above, the higher the predicted degree of congestion in the system (system congestion), the higher the congestion charge set. According to FIG. 9, the charge for five minutes from 6:05 for the node identified by the identification information "L002" is 15 yen / kW.

[0029] FIG. 10 is a diagram showing a data configuration of the application cost 266 according to this embodiment. The application cost 266 is, for example, data in a table format. One row (record) includes columns (attributes) of a penalty for an application request and a power conversion cost. The penalty indicates a cost (yen / kW) incurred when an application request from the power transmission and distribution network management system 480 to the storage battery management device 100 is not satisfied. The power conversion cost indicates a cost (yen / kW) incurred for power conversion such as conversion between electric energy and chemical energy, conversion between DC power and AC power, and voltage adjustment. The application cost 266 also includes a power conversion cost in the recovery phase. The power conversion cost also differs depending on the type of storage battery. When there are multiple types of storage batteries corresponding to the same application request and the power conversion costs are different, there may be records of the same application request for each type of storage battery.

[0030] <Battery management device: control unit> 3, the explanation of the control unit 110 will continue. The control unit 110 is configured to include a CPU (Central Processing Unit), and is provided with a monitoring unit 111, a usage schedule creation unit 112, a recovery schedule creation unit 113, and a monitoring screen control unit 114.

[0031] The monitoring unit 111 receives the charging rate, temperature, state, and the like as information on the storage battery periodically transmitted by the storage battery monitoring system 460, and stores the information in the storage battery information database 210. The monitoring unit 111 also receives the voltage, frequency, active power flow, and the like as information on the nodes 441 to 443 periodically transmitted by the power transmission and distribution network management system 480, and stores the information in the node information database 220.

[0032] The usage schedule creation unit 112 creates a schedule for charging or discharging the storage batteries 411-416 in response to application requests (usage requests) for the storage batteries 411-416 transmitted by the power transmission and distribution network management system 480. The usage schedule creation unit 112 further transmits a control message corresponding to the schedule to the storage battery monitoring system 460. The application request includes application identification information and power amount. If the power amount is positive, it is a request for discharging, and if it is negative, it is a request for charging.

[0033] The usage schedule creation unit 112 selects the storage batteries 411-416 so that the congestion charge and power conversion cost satisfy and are low cost conditions (cost standards, predetermined conditions), and allocates the amount of power to be discharged or charged to each of them. At this time, the usage schedule creation unit 112 refers to a database stored in the storage unit 120. Furthermore, when the application request is voltage control, the usage schedule creation unit 112 selects a storage battery connected to a node close to the substation 448.

[0034] The recovery schedule creation unit 113 creates a schedule for charging and discharging the storage batteries 411-416 during a period (recovery phase) when the storage batteries are not being used in response to application requests. The recovery schedule creation unit 113 further transmits a control message corresponding to the schedule to the storage battery monitoring system 460. The recovery schedule creation unit 113 selects the storage batteries 411-416 so that the wheeling charge, congestion charge, and power conversion cost satisfy the cost conditions and are low, and allocates the amount of power to be discharged or charged to each storage battery.

[0035] The monitoring screen control unit 114 displays monitoring information such as the battery control schedule information 310 (see FIG. 14), virtual battery status information 320 (see FIG. 15), and battery charging rate information 330 (see FIG. 16) described below on a display connected to the input / output unit 180.

[0036] As described above, the battery management device 100 includes a battery information database 210 (see FIG. 4) that stores information about the battery including the charging rate, a compatible application database 240 (see FIG. 7) that stores the types of battery usage (application) requests that the battery can handle, a connection information database 250 (see FIG. 8) that stores connection information that indicates the connection relationship between the battery and the node, and a cost information database 260 that stores information on costs (see congestion charge data 261 in FIG. 9) including at least one of power conversion costs (see application cost 266 in FIG. 10) and congestion charges, as well as specified conditions related to the costs, and includes a usage schedule creation unit 112 that creates a schedule for charging or discharging the battery that satisfies specified conditions (related to costs) in response to a request for battery usage, including the amount of power, by referring to the cost information database 260.

[0037] The usage schedule creation unit 112 refers to a distance information database 230 (see FIG. 6 ) that stores distance information indicating the distance between a node and a substation, and creates a schedule in response to a request for voltage adjustment by giving priority to a storage battery connected to a node that is close to the substation.

[0038] The cost information stored in the cost information database 260 includes wheeling charges. The battery management device 100 includes a recovery schedule creation unit 113 that references the battery information database 210, the connection information database 250, and the cost information database 260 to create a schedule for charging and discharging the battery that satisfies specified conditions (related to costs) for the recovery of the battery.

[0039] <Battery usage schedule creation process> 11 and 12 are flowcharts of the storage battery usage schedule creation process according to this embodiment. The storage battery usage schedule creation process is executed at a predetermined timing, for example, when node information or an application request is received from the power transmission and distribution network management system 480.

[0040] In step S11, the monitoring unit 111 receives node information or an application request from the power transmission and distribution network management system 480. In step S12, if the monitoring unit 111 receives an application request in step S11 (step S12→YES), the process proceeds to step S14. If the monitoring unit 111 does not receive an application request (step S12→NO), the process proceeds to step S13. In step S13, the monitoring unit 111 stores the node information received in step S11 in the node information database 220, and updates the voltage, frequency, and update date and time.

[0041] In step S14, the usage schedule creation unit 112 acquires the application identification information and the power amount, which is a parameter, as data of the received application request. Note that if the power amount is positive, it is a request for discharging, and if it is negative, it is a request for charging. In step S15, the usage schedule creation unit 112 refers to the corresponding application database 240 (see FIG. 7) to acquire identification information of a storage battery corresponding to the application request. In the following description, the identification information of a storage battery is also simply referred to as a storage battery.

[0042] In step S16, the usage schedule creation unit 112 acquires available storage batteries from among the storage batteries acquired in step S15. Available storage batteries are storage batteries whose status in the storage battery information database 210 (see FIG. 4) is "idle." In step S17, the usage schedule creation unit 112 calculates the amount of available power. The amount of available power is the amount of power that can be charged or discharged, and is calculated based on the storage capacity and charging rate of the storage battery information database 210, and the upper or lower limit of the charging rate.

[0043] In step S18, if the available power amount calculated in step S17 satisfies the requested power amount obtained in step S14 (step S18 → Satisfied), the usage schedule creation unit 112 advances the process to step S20. If the available power amount calculated in step S17 is insufficient for the requested power amount obtained in step S14 (step S18 → Insufficient), the usage schedule creation unit 112 advances the process to step S19. In step S19, usage schedule creation section 112 waits for a predetermined time and returns the process to step S16.

[0044] In step S20, the usage schedule creation unit 112 acquires identification information of a node to which an available storage battery is connected, by referring to the connection information database 250. In the following description, the identification information of a node is also simply referred to as a node. In step S21, the usage schedule creation unit 112 selects a node with the minimum cost by referring to the congestion charge data 261 (see FIG. 9). Note that there may be a plurality of nodes with the minimum cost.

[0045] In step S22, if the congestion charge of the node selected in step S21 complies with the cost standard (cost condition) (step S22→YES), the usage schedule creation unit 112 proceeds to process step S24 (see FIG. 12). If the congestion charge of the node selected in step S21 does not complies with the cost standard (step S22→NO), the usage schedule creation unit 112 proceeds to process step S23. The usage schedule creation unit 112 may determine whether or not the congestion charge complies by taking into account a penalty charge (see application cost 266 in FIG. 10) in addition to the congestion charge. In step S23, usage schedule creation section 112 waits for a predetermined time and returns the process to step S21. Note that usage schedule creation section 112 may return the process to step S16.

[0046] Turning now to FIG. 12, the description of the storage battery usage schedule creation process will continue. In step S24, the usage schedule creation unit 112 selects a node according to the requested application (see step S14). For example, if the application is voltage regulation, a node close to a substation 448 is selected. Note that voltage regulation is an application that is requested when the voltage deviates from the allowable range. The distance from the substation 448 can be acquired by referring to the distance information database 230 (see FIG. 6).

[0047] In step S25, the usage schedule creation unit 112 selects a battery taking into consideration the attributes of the battery, such as the type, charging rate, charging and discharging efficiency, etc. For example, when discharging, a battery with a high charging rate and high discharging efficiency is desirable. In step S26, the usage schedule creation unit 112 calculates the amount of power to be charged or discharged from the battery selected in step S25 so as to minimize the power conversion cost. The power conversion cost can be obtained by referring to the application cost 266 (see FIG. 10).

[0048] In step S27, if the power conversion cost calculated in step S26 complies with the cost standard (cost condition) (step S27 → YES), the usage schedule creation unit 112 proceeds to step S29, and if it does not complies (step S27 → NO), the usage schedule creation unit 112 proceeds to step S28. In step S28, the usage schedule creation section 112 waits for a predetermined time and returns the process to step S26. Note that the usage schedule creation section 112 may return the process to step S16 or step S21.

[0049] In step S29, the usage schedule creation unit 112 creates a usage schedule for the selected battery. The usage schedule includes the start time and end time of charging or discharging and the amount of power for each storage battery. In step S30, the usage schedule creation unit 112 transmits a control message corresponding to the usage schedule created in step S29 to the storage battery monitoring system 460. The storage battery monitoring system 460 instructs the storage battery to charge or discharge based on the control message via the storage battery monitoring device 470. The control message includes identification information of the storage battery, identification information of the application, the amount of power, and the start time or end time. The control message may include the start time and the end time.

[0050] <Battery recovery schedule creation process> 13 is a flowchart of a storage battery recovery schedule creation process according to this embodiment. The storage battery recovery schedule creation process is executed at a predetermined timing, for example, after the storage battery use schedule is executed (after the end of the periods 712 and 714 shown in FIG. 2).

[0051] In step S41, the recovery schedule creation unit 113 refers to the storage battery information database 210 (see FIG. 4) to acquire storage batteries that are in an idle state. In step S42, the recovery schedule creation unit 113 selects a storage battery to be charged and a storage battery to be discharged. For example, the recovery schedule creation unit 113 selects a storage battery whose charging rate is at or close to the upper limit as a storage battery to be discharged. Also, for example, the recovery schedule creation unit 113 selects a storage battery whose charging rate is at or close to the lower limit as a storage battery to be charged.

[0052] In step S43, the recovery schedule creation unit 113 selects storage batteries connected to the same node or in the same area from among the storage batteries selected in step S42. The area of ​​the storage battery can be acquired by referring to the area (see node information database 220 in FIG. 5) of the node (see connection information database 250 in FIG. 8) to which the storage battery is connected.

[0053] In step S44, the recovery schedule creation unit 113 calculates the total amount of charging power to be charged into the charging battery and the total amount of discharging power to be discharged by the discharging storage battery. In step S45, if the total charging power amount exceeds the total discharging power amount (step S45→YES), the recovery schedule creation unit 113 advances the process to step S46. If the total charging power amount does not exceed the total discharging power amount (step S45→NO), the recovery schedule creation unit 113 advances the process to step S47.

[0054] In step S46, the recovery schedule creation unit 113 reduces the number of storage batteries to be charged. The recovery schedule creation unit 113 may reduce the amount of power to be charged. In step S47, the recovery schedule creation unit 113 reduces the amount of storage batteries to be discharged. The recovery schedule creation unit 113 may reduce the amount of power to be discharged.

[0055] In step S48, the recovery schedule creation unit 113 specifies a combination of a storage battery to be charged and a storage battery to be discharged. The recovery schedule creation unit 113 specifies a combination that reduces the wheeling charge, congestion charge, and power conversion cost. In step S49, if the wheeling charge, congestion charge, and power conversion cost comply with the cost standard (step S49→YES), the recovery schedule creation unit 113 proceeds to step S50. If the wheeling charge, congestion charge, and power conversion cost do not comply with the cost standard (step S49→NO), the recovery schedule creation unit 113 ends the storage battery recovery schedule creation process. The recovery schedule creation unit 113 starts the recovery schedule creation process again after a predetermined time has elapsed.

[0056] In step S50, the recovery schedule creation unit 113 creates a recovery schedule for the selected battery. The recovery schedule includes the start time, end time, and amount of power for charging or discharging for each storage battery. In step S51, the recovery schedule creation unit 113 transmits a control message corresponding to the usage schedule created in step S50 to the storage battery monitoring system 460. The storage battery monitoring system 460 instructs the storage battery to charge or discharge based on the control message via the storage battery monitoring device 470. The control message includes identification information of the storage battery, identification information of the application, the amount of power, and the start time or end time. The control message may include the start time and the end time.

[0057] <Monitoring Information> The monitoring information output by the monitoring screen control unit 114 will be described below. Fig. 14 is a diagram showing storage battery control schedule information 310 according to this embodiment. The storage battery control schedule information 310 indicates a future schedule for charging and discharging the storage battery (see step S29 in Fig. 12 and step S50 in Fig. 13). To explain in more detail, the storage battery control schedule information 310 is in a table format, and one row (record) indicates a schedule for charging and discharging for one storage battery. The rows of the storage battery control schedule information 310 include identification information of the storage battery (referred to as "ID" in Fig. 14), the start time of charging and discharging, the charging rate at the start, a related application request, a distinction between charging and discharging, and the amount of power to be charged and discharged.

[0058] Fig. 15 is a diagram showing virtual battery status information 320 according to this embodiment. The virtual battery status information 320 is information related to a virtual battery in which the entire battery is virtually regarded as one battery. To explain in detail, the virtual battery status information 320 is in a table format, and one row (record) indicates the state of the virtual battery in a predetermined period (for example, one day, one hour). The rows of the virtual battery status information 320 include the start time of the period, the total storage capacity which is the sum of the storage capacities of the batteries, the average usage rate which is the ratio of the power used to the rated power, the amount of stored power which is the total amount of stored power, the ratio of the storage capacity of the battery in the recovery mode (recovery schedule, see Fig. 13) to the total storage capacity, and the ratio of the storage capacity of the battery in the usage mode (usage schedule, see Fig. 12) to the total storage capacity. Rows of virtual battery status information 320 may include the ratio of the rated power of the batteries in recovery mode to the sum of the rated power of the batteries and the ratio of the rated power of the batteries in utilization mode to the sum of the rated power of the batteries.

[0059] 16 is a diagram showing the storage battery charging rate information 330 according to this embodiment. The storage battery charging rate information 330 is a graph showing the change over time in the charging rate of a storage battery specified by a user of the storage battery management device 100.

[0060] <Characteristics of the battery management device> The battery management device 100 creates a usage schedule, which is a schedule for charging or discharging the battery, in response to an application request sent by the power transmission and distribution network management system 480, and sends a control message to the battery monitoring system 460. The battery management device 100 creates a usage schedule that meets the cost criteria and keeps costs low, referring to congestion charges, power conversion costs, and penalty fees.

[0061] The battery management device 100 creates a recovery schedule that is executed during a period (recovery phase) when the usage schedule is not being executed, and transmits a control message to the battery monitoring system 460. The battery management device 100 creates the recovery schedule by referring to wheeling charges, congestion charges, and power conversion costs, and by reducing costs.

[0062] <<Variations>> In the storage battery recovery schedule creation process, the recovery schedule creation unit 113 selects storage batteries to be charged and storage batteries to be discharged (see step S42). The power sources 421 to 423 may be included as storage batteries to be discharged.

[0063] Although several embodiments of the present invention have been described above, these embodiments are merely illustrative and do not limit the technical scope of the present invention. The present invention can take various other embodiments, and various modifications such as omissions and substitutions can be made without departing from the gist of the present invention. These embodiments and their modifications are included in the scope and gist of the invention described in this specification, etc., and are included in the scope of the invention described in the claims and their equivalents. [Explanation of symbols]

[0064] 100 Storage battery management device 111 Monitoring Department 112 Usage Schedule Creation Department 113 Recovery Schedule Creation Department 114 Monitoring screen control section 128 Programs 210 Battery Information Database 220 Node Information Database 230 Distance Information Database 240 compatible application database 250 connection information database 260 Cost Information Database 261 Congestion Charge Data 266 Application Fee 411~416 Storage battery 441~443 nodes 448 Substation

Claims

1. a battery information database that stores information about the battery including the charging rate; a corresponding application database that stores types of storage battery usage requests that the storage battery can handle; a connection information database that stores connection information indicating a connection relationship between the storage battery and the node; and Refer to a cost information database that stores cost information including at least one of a power conversion cost and a congestion charge, and predetermined conditions related to the costs; A usage schedule creation unit creates a schedule for charging or discharging the storage battery that satisfies the predetermined conditions in response to the storage battery usage request including the amount of power. Storage battery management device.

2. The usage schedule creation unit, Refer to a distance information database that stores distance information indicating a distance between the node and a substation; In response to the request for voltage adjustment, the schedule is created by giving priority to storage batteries connected to nodes that are close to the substation. The battery management device according to claim 1 .

3. The cost information stored in the cost information database includes a wheeling charge, Refer to the storage battery information database, the connection information database, and the cost information database; A recovery schedule creation unit that creates a schedule for charging and discharging the storage battery that satisfies the predetermined condition for recovery of the storage battery. The battery management device according to claim 1 .

4. The battery management device a battery information database that stores information about the battery including the charging rate; a corresponding application database that stores types of storage battery usage requests that the storage battery can handle; a connection information database that stores connection information indicating a connection relationship between the storage battery and the node; and Refer to a cost information database that stores cost information including at least one of a power conversion cost and a congestion charge, and predetermined conditions related to the costs; Executing a step of creating a schedule for charging or discharging the storage battery that satisfies the predetermined conditions for the storage battery usage request including the amount of power. Storage battery management method.

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