Power management system and power supply system

Abstract

The present invention determines an appropriate allocation of grids, charger / dischargers, and batteries with respect to a required charge amount of the batteries. A power management system (7) that determines the arrangement of charger / dischargers and batteries in a plurality of grids having a fixed power supply comprises: an input unit (71) that receives input of a required charge amount and a remaining time of a battery; an acquisition unit (72) that acquires the current charge amount of the battery; a required output calculation unit (75) that determines a required output of the battery on the basis of the required charge amount and the remaining time of the battery; a storage unit (73) that stores an upper limit output of each of the grids, the charger / dischargers, and the batteries; an upper limit output calculation unit (76) that calculates the upper limit output of each combination of the grids, charger / dischargers, and batteries on the basis of the upper limit output of each of the grids, charger / dischargers, and batteries; and a combination determination unit (77) that determines the arrangement of the charger / dischargers and the batteries in the grids on the basis of the required outputs of the batteries and the upper limit outputs of each combination of the grids, charger / dischargers, and batteries.

Description

Power management system and power supply system

[0001] The present invention relates to a power management system and a power supply system.

[0002] In recent years, a system has been proposed in which batteries and chargers / dischargers are connected and disconnected between grids to exchange and charge / discharge power. Each battery is given a planned charge amount value [kWh] based on a battery usage plan. The system determines how to allocate the grids, chargers, and batteries to achieve the requested planned battery charge amount value.

[0003] A similar invention is described in Patent Document 1, which describes an invention in which, when a battery charge / discharge amount plan value is requested from a higher level, a charger / discharger to which the battery is connected is selected and a command value is determined. However, it should be noted that the maximum charge / discharge rate [kW] at each base station is determined by the upper limit output of either the base station or the charger / discharger.

[0004] International Publication No. 2022 / 195786

[0005] Patent Document 1 describes a method for allocating batteries to satisfy a planned charge amount value and a method for determining charge / discharge command values. However, the maximum charge / discharge output is limited by the performance of the grid and chargers / dischargers. Furthermore, while the invention described in Patent Document 1 allows for the chargers / dischargers to be detached and moved, it does not consider how to determine allocation in this case. It is believed that by appropriately combining the grid, chargers / dischargers, and batteries, it is possible to charge and discharge the batteries while making the most of the capabilities of the grid and chargers / dischargers.

[0006] Therefore, an object of the present invention is to determine an appropriate allocation of grids, chargers / dischargers, and batteries for the required amount of battery charge.

[0007] In order to solve the above-mentioned problems, the power management system of the present invention is a power management system that determines the placement of chargers and dischargers and batteries on a plurality of grids having fixed power sources, and is characterized by comprising: an input unit that accepts input of a required charge amount of the battery and a remaining time until charging to the required charge amount; an acquisition unit that acquires a current charge amount of the battery; a required output calculation unit that determines a required output of the battery based on the required charge amount of the battery and the remaining time until charging to the required charge amount; a memory unit that stores an upper limit output of the grid, an upper limit output of the charger / discharger, and an upper limit output of the battery; an upper limit output calculation unit that calculates an upper limit output of each combination of the grid, the charger / discharger, and the battery based on the upper limit output of the grid, the upper limit output of the charger / discharger, and the upper limit output of the battery stored in the memory unit; and a combination determination unit that determines the placement of the charger / dischargers and batteries on the grid based on the required output of the battery and the upper limit output of each combination of the grid, the charger / discharger, and the battery.

[0008] The power supply system of the present invention is a power supply system comprising a power grid and a power management system, wherein the power grid comprises at least one of a plurality of grids having fixed power sources, chargers / dischargers, and batteries, and the chargers / dischargers comprise a charger / discharger connection unit that connects the chargers / dischargers to the grid, and a battery connection unit that connects the batteries to the chargers / dischargers, and further comprises an input unit that inputs a current charge amount of the battery, a required charge amount of the battery, and a remaining time until the required charge amount is reached, and a power management system that calculates the current charge amount of the battery, the required charge amount of the battery, and the remaining time until the required charge amount is reached, based on the current charge amount of the battery, the required charge amount of the battery, and the remaining time until the required charge amount is reached. The present invention is characterized by comprising: a required output calculation unit that determines a required output of the battery; a memory unit that stores an upper limit output of the grid, an upper limit output of the charger / discharger, and an upper limit output of the battery; an upper limit output calculation unit that calculates an upper limit output of each combination of the grid, the charger / discharger, and the battery based on the upper limit output of the grid, the upper limit output of the charger / discharger, and the upper limit output of the battery; and a combination determination unit that determines an arrangement of the charger / discharger and the battery on the grid based on the required output of the battery and the upper limit output of each combination of the grid, the charger / discharger, and the battery. Other means will be described in the description of the embodiment of the invention.

[0009] According to the present invention, it is possible to determine an appropriate allocation of grids, chargers, and batteries for a required battery charge amount. This allocation ensures a charge / discharge rate required to achieve a planned charge amount value.

[0010] 1 is a configuration diagram of a power supply system according to a first embodiment. FIG. 1 shows a configuration diagram of each base. FIG. 1 shows a configuration diagram of each base. FIG. 1 shows a configuration diagram of each base. FIG. 1 shows a block diagram of a power management system. FIG. 2 shows a data table stored in a storage unit. FIG. 3 shows a combined upper limit output table calculated by an upper limit output calculation unit. FIG. 4 shows a flow chart illustrating processing of the power management system. FIG. 5 shows a movement command screen. FIG. 6 shows a block diagram of a power management system according to a second embodiment. FIG. 7 shows a data table stored in a storage unit. FIG. 8 shows a block diagram of a power management system according to a third embodiment. FIG. 9 shows a data table stored in a storage unit. FIG. 10 shows a flow chart illustrating processing of the power management system. FIG. 11 shows a block diagram of a power management system according to a fourth embodiment. FIG. 12 shows a movement time table stored in a storage unit. FIG. 13 shows a combined upper limit output table calculated by an upper limit output calculation unit. FIG. 14 shows a block diagram of a power management system according to a fifth embodiment.

[0011] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First Embodiment A power supply system of this embodiment determines a charger / discharger and a grid to which a battery is connected based on battery reservation information, and charges the battery. Specifically, the power supply system calculates a required output based on the battery reservation information, calculates a combined upper limit output for each combination of each grid, each charger / discharger, and each battery, and determines a combination of devices based on the required output and the combined upper limit output.

[0012] FIG. 1 is a configuration diagram of a power supply system 8 according to the first embodiment. The power supply system 8 is configured by connecting each power management device 2 at bases 1A to 1L via the Internet 9 so that they can communicate with a power management system 7 and a battery reservation system 6. At base 1A, the power management device 2 and a grid 3A are installed, and chargers / dischargers 4A and 4B and a battery 5 are detachably connected. When no particular distinction is needed between the bases 1A to 1L, they will simply be referred to as base 1. When no particular distinction is needed between the grids 3A to 3L, they will simply be referred to as grid 3.

[0013] The power management system 7 is configured as a server connected to the Internet 9, and determines the placement of chargers / dischargers 4 and batteries 5 on multiple grids 3A to 3L having fixed power sources. The battery reservation system 6 is configured as a server connected to the Internet 9, and accepts input of reservation information for batteries 5. At this time, the battery reservation information may be accepted as input from a user terminal 61 connected to the Internet 9. The battery reservation information accepted by the battery reservation system 6 is input to the power management system 7 via the Internet 9.

[0014] 2A shows a configuration diagram of a base station 1. A grid 3 and a power management device 2 are installed at the base station 1. Chargers / dischargers 4A and 4B are detachably connected to the grid 3. An additional charger / discharger 4 may be connected to the grid 3.

[0015] A battery 5 is detachably connected to the charger / discharger 4A. The battery 5 may be connected to the charger / discharger 4B. When there is no need to distinguish between the charger / dischargers 4A and 4B, they will simply be referred to as the charger / discharger 4.

[0016] The grid 3 includes a grid management device 31, a power distribution system 32 and an AC / DC converter 321, a solar power generation system 33 and a DC / DC converter 331. The grid 3 further includes a wind power generation system 34 and an AC / DC converter 341, a diesel power generation system 35 and an AC / DC converter 351, a battery 36 and a DC / DC converter 361, a load 37 and an AC / DC converter 371, and connection units 381 to 383.

[0017] The photovoltaic power generation system 33 and the wind power generation system 34 are renewable energy power generation systems whose current output changes from moment to moment depending on the state of nature. The load 37 is, for example, a motor, an air conditioner, or lighting, whose power consumption changes from moment to moment.

[0018] The grid management device 31 determines command values ​​for a power distribution system 32, a solar power generation system 33, a wind power generation system 34, a diesel power generation system 35, a battery 36, and a load 37. The grid 3 shown in Fig. 2A is one example configuration.

[0019] In this configuration diagram, the devices are connected via a DC (direct current) system, but they may also be connected via an AC (alternating current) system. When connected via an AC system, DC power is supplied from the AC system to the connection sections 381 to 383 via an AC / DC converter.

[0020] The charger / discharger 4A connects the grid 3 and the battery 5 and charges / discharges the battery 5. Although no battery 5 is connected to the charger / discharger 4B in Fig. 2A, another battery 5 may be connected thereto. Although nothing is connected to the connection unit 383, another charger / discharger 4 may be connected thereto. The charger / discharger 4 is configured to include connection units 42 and 44, a converter 43, and a charger / discharger management device 41. The charger / discharger 4 is connected to the grid 3 via the connection unit 42 and to the battery 5 via the connection unit 44.

[0021] Charger / discharger management device 41 is communicatively connected to connection units 42, 44 and converter 43. Charger / discharger management device 41 acquires the power input / output to / from converter 43, the current flowing through converter 43, the voltage generated in converter 43, and the like.

[0022] The battery 5 includes a connection unit 52, a battery module 53, and a battery management device 51. The battery 5 is connected to the charger / discharger 4 via the connection unit 52. The battery management device 51 is communicably connected to the connection unit 52 and the battery module 53. The battery management device 51 acquires the power input / output to / from the battery module 53, the current flowing from the battery module 53, the voltage generated in the battery module 53, etc.

[0023] The power management device 2 manages the power input and output to and from the grid 3, the chargers / dischargers 4A and 4B, and the battery 5, and determines command values. The power management device 2 is communicably connected to a grid management device 31, a charger / discharger management device 41, and a battery management device 51.

[0024] The power management device 2 acquires from the grid management device 31 any of the power input / output to / from the grid 3, the current flowing in the grid 3, and the voltage generated in the grid 3. Similarly, the power management device 2 acquires from the charger / discharger management device 41 any of the power input / output to / from the charger / discharger 4, the current flowing in the charger / discharger 4, and the voltage generated in the charger / discharger 4. The power management device 2 acquires from the battery management device 51 any of the power input / output to / from the battery 5, the current flowing in the battery 5, and the voltage generated in the battery 5.

[0025] The configuration of the base station 1 shown in Fig. 2A is an example. As shown in Fig. 2B , the power management device 2 of the base station 1 may be communicably connected to a grid management device 31, a charger / discharger management device 41, and a battery management device 51 via the Internet 9.

[0026] As shown in Fig. 2C, the power management device 2 at base 1 may be communicatively connected to the grid management device 31 and the charger / discharger management device 41 via connections 381 to 383 and connection 42, and may also be communicatively connected to the battery management device 51 via connections 44 and 52. As shown in Fig. 2D, the power management device 2 at base 1 may be communicatively connected directly to the AC / DC converters 321, 341, 351, 371 and the DC / DC converters 331, 361 in the grid 3.

[0027] Fig. 3 shows a block diagram of the power management system 7. The power management system 7 determines the device combination of the grid 3, charger / discharger 4, and battery 5 based on information from the battery reservation system 6. As shown in Fig. 1, the power management system 7 is communicably connected to the battery reservation system 6 and the power management device 2 at each base 1 via the Internet 9. The configuration shown in Fig. 3 is an example, and the power management system 7 may be directly connected to the battery reservation system 6 and the power management device 2 at each base 1.

[0028] The power management system 7 includes an input unit 71, an acquisition unit 72, a storage unit 73, a calculation unit 74, and a command unit 78. The calculation unit 74 further includes a required output calculation unit 75, an upper limit output calculation unit 76, and a combination determination unit 77. The input unit 71 receives input of the battery number, the required charge amount, and the remaining time from the battery reservation system 6. Instead of receiving input of information from the battery reservation system 6, the input unit 71 of the power management system 7 may directly receive input of the battery number, the required charge amount, and the remaining time.

[0029] The acquisition unit 72 acquires from each power management device 2 the current charge amount of the battery 5, battery location information indicating which base 1 the battery 5 is located at, and charger / discharger location information indicating which base the charger / discharger 4 is located at, and stores this information in the memory unit 73.

[0030] 4 shows a data table 731 stored in the storage unit 73. The data table 731 stores the device type, number, current base number, upper limit output, maximum number of connections, allowable number of connections, connection availability, maximum charge amount, and current charge amount. This is an example.

[0031] The device type contains information indicating the type of device: "grid," "charger / discharger," or "battery." Among the numbers, the grid number is a number that identifies each grid 3, and is assigned the same number as the number that identifies the base 1. The charger / discharger number is a number that identifies each charger / discharger 4. The battery number is a number that identifies each battery 5.

[0032] The current base number is a number that identifies the base 1 where the grid 3, charger / discharger 4, and battery 5 are located. The upper limit output refers to the upper limit output restricted by the operation of each device, and is determined by the maximum output determined from the specifications of the grid 3, the charger / discharger 4, or the battery 5. In particular, the upper limit output of the grid 3 is obtained by subtracting the current output of the charger / discharger 4 connected to the grid 3 from the maximum output of the grid 3. This makes it possible to charge the battery 5 without exceeding the maximum output of the grid 3 when multiple chargers / dischargers 4 are connected to the grid 3. This is just an example, and the upper limit output may be obtained from each power management device 2.

[0033] The maximum number of connections is the maximum number of devices that can be connected to the device. The allowable number of connections is the number of devices that can currently be connected to the device. The connection availability status indicates whether or not the device is currently connectable. The maximum charge amount indicates the maximum charge amount for the battery 5. The current charge amount indicates the current charge amount for the battery 5.

[0034] The data table 731 stored in the storage unit 73 is updated based on the numerical values ​​transmitted from the acquisition unit 72. The number of allowable connections is calculated as the number of connections 381 to 383 of the grid 3 that are not being used for charging or discharging. The grid connection availability status is indicated as "not available" when the number of allowable connections is 0, and as "available" when the number of allowable connections is 1 or more.

[0035] The charger / discharger connection availability status is indicated as "available" when the charger / discharger 4 is not charging / discharging and can be moved and connected, and "not available" otherwise. The battery connection availability status is indicated as "available" when the battery 5 is not charging / discharging and can be moved and connected, and "not available" otherwise.

[0036] 3, the explanation will be continued. The calculation unit 74 is configured to include a required output calculation unit 75, an upper limit output calculation unit 76, and a combination determination unit 77. The required output calculation unit 75 calculates the required output from the battery number, the required charge amount, the remaining time, and the current charge amount. Specifically, the required output calculation unit 75 calculates the required output of the battery 5 indicated by the battery number by subtracting the current charge amount from the required charge amount and dividing the result by the remaining time.

[0037] 5 shows a combined upper limit output table 732 calculated by the upper limit output calculation unit 76. The grid connection availability state refers to the connection availability state of the grid 3. The charger / discharger connection availability state refers to the connection availability state of the charger / discharger 4. The battery connection availability state refers to the connection availability state of the battery 5.

[0038] The combined upper limit output is the upper limit output for the combination of grid 3, charger / discharger 4, and battery 5, and the minimum value of the grid upper limit output of grid 3, the charger / discharger upper limit output of charger / discharger 4, and the battery upper limit output of battery 5 is the upper limit output for the combination of grid 3, charger / discharger 4, and battery 5.

[0039] The usability of the combination refers to whether or not the combination of the grid 3, the charger / discharger 4, and the battery 5 can be used. When the grid connection availability state, the charger / discharger connection availability state, and the battery connection availability state are all "available," the usability of the combination is "available." When any of the grid connection availability state, the charger / discharger connection availability state, and the battery connection availability state is "unavailable," the usability of the combination is "unavailable."

[0040] The upper limit output calculation unit 76 calculates the upper limit output and usability when all combinations of the grid 3, the charger / discharger 4, and the battery 5 are combined. The upper limit output calculation unit 76 calculates the combined upper limit output from the grid upper limit output of the grid 3, the charger / discharger upper limit output of the charger / discharger 4, and the battery upper limit output of the battery 5. The upper limit output calculation unit 76 calculates the usability of the combination from the grid connection availability state of the grid 3, the charger / discharger connection availability state of the charger / discharger 4, and the battery connection availability state of the battery 5.

[0041] If the required charge amount is greater than the maximum charge amount, the battery connection status may be updated to "No." The combined upper limit output is determined as the minimum of the grid upper limit output, the charger / discharger upper limit output, and the battery upper limit output.

[0042] Returning to FIG. 3 , the explanation will be continued. The combination determination unit 77 determines a new requested equipment combination based on the required output of the battery 5, the combined upper limit output of the grid 3, the charger / discharger 4, and the battery 5, and whether the combination can be used. The combination determination unit 77 then outputs the required equipment combination and the required output to the command unit 78. Of the combinations for which the combined usability is possible, the combination determination unit 77 determines the combination for which the combined upper limit output is greater than the required output and for which the difference between the required output and the combined upper limit output is the smallest, as the requested equipment combination. At this time, if all the combination usability is impossible, the battery request system may be notified that reservation is not possible. This combination determination method is one example.

[0043] The combination determination unit 77 transmits the requested equipment combination and the requested output to the command unit 78. The command unit 78 receives the requested output, the requested equipment combination, position information of the charger / discharger 4, and position information of the battery 5. Based on this input information, the command unit 78 transmits a charger / discharger movement command value for moving the charger / discharger 4, a battery movement command value for moving the battery 5, and a power command value for charging and discharging the battery. The charger / discharger movement command value is for moving the charger / discharger 4 related to the requested equipment combination from the current position of the charger / discharger 4 to the base 1 where the grid 3 related to the requested equipment combination is located. The battery movement command value is for moving the battery 5 related to the requested equipment combination from the current position of the battery 5 to the base 1 where the grid 3 related to the requested equipment combination is located.

[0044] 6 is a flowchart showing the processing of the power management system 7. First, the input unit 71 receives a battery request command from the battery reservation system 6 via the Internet 9 and acquires reservation information for the battery 5 (step S10). Then, upon receiving input of the battery number to be used, the required charge amount, and the remaining time, the input unit 71 transmits the information to the required output calculation unit 75 (step S11). In other words, the reservation information for the battery 5 includes the battery number to be used, the required charge amount, and the remaining time.

[0045] The acquisition unit 72 acquires the current charge amount, the battery location information, and the charger / discharger location information via the Internet 9, and stores them in the storage unit 73 (step S12). The required output calculation unit 75 calculates the required output from the battery number, the required charge amount, and the remaining time stored in the storage unit 73, and transmits it to the combination determination unit 77 (step S13).

[0046] The upper limit output calculation unit 76 calculates the combined upper limit output and whether the combined output is usable or not from the required charge amount, the grid upper limit output, the charger / discharger upper limit output, the battery upper limit output, and the maximum charge amount, and transmits the calculated combined upper limit output and whether the combined output is usable or not to the combination determination unit 77 (step S14).

[0047] The combination determination unit 77 determines the required equipment combination and the required equipment combination based on the required output, the combined upper limit output, and whether the combination can be used (step S15), and transmits the required output and the required equipment combination to the command unit (step S16).

[0048] The command unit 78 calculates a charger / discharger movement command value and a battery movement command value from the required output, the required device combination, the charge / discharge location information, and the battery location information (step S17). When the command unit 78 further transmits the required output, the charger / discharger movement command value, and the battery movement command value to the outside (step S18), the process in FIG. 6 ends.

[0049] In the first embodiment described above, the required output is calculated based on the reservation information of the battery 5, and each combined upper limit output is calculated from the upper limit outputs of each grid 3, each charger / discharger 4, and each battery 5. The required equipment combination is determined based on the required output, the combined upper limit output, and whether the combination can be used. As a result, when a reservation is made for the battery 5, the equipment combination can be changed to perform the necessary charging and discharging of the battery 5.

[0050] 7 shows a movement command screen 62. The movement command screen 62 is displayed on the display unit of the user terminal 61, for example. The movement command screen 62 displays a movement command pane 621 and a map pane 622. The movement command pane 621 displays a reservation information field, a current information field, a required equipment combination field, and a command value field. Here, the command value field displays a charger / discharger movement command value and a battery movement command value.

[0051] The reservation information field shows that the battery number is #1 and that a battery with a required charge amount of 20 [kWh] is reserved for the reservation time of 17:00. The current information field shows that the site number of battery 5 is #1 and that a battery with a current charge amount of 10 [kWh] exists at the current time of 15:30. The requested equipment combination field shows that the site number is #2 and the grid number is #2, and that the charger / discharger number of charger / discharger 4 to be combined with this is #3, and that the battery number of battery 5 is #1.

[0052] The command value column shows that the required output is 5 kW and the remaining time is 2.5 hours. The charger number of charger / discharger 4 is #1, which indicates that it must be moved from site #1 to site #2. The battery number of battery 5 is #3, which indicates that it must be moved from site #3 to site #2.

[0053] The map pane 622 displays an arrow from base #1 to base #2 corresponding to the charge / discharge movement command value, and an arrow from base #3 to base #2 corresponding to the battery movement command value on a map showing each base #1 to #4.

[0054] According to this embodiment, it is possible to determine an appropriate allocation of the grid 3, the charger / discharger 4, and the battery 5 for the required charge amount of the battery 5. In this allocation, it is possible to ensure the charge / discharge speed required to achieve the planned charge amount value.

[0055] Second Embodiment In the first embodiment described above, the upper limit output of the grid 3 stored in the storage unit 73 is determined from the maximum output of the specifications of the grid 3. However, when a charger / discharger 4 is connected to the grid 3 and is charging / discharging, the upper limit output of the grid 3 may be determined from the maximum output of the grid 3 and the current output of the charger / discharger 4. The second embodiment differs from the first embodiment in that the current output of the charger / discharger 4 connected to the grid 3 is acquired and the upper limit output of the grid 3 is calculated.

[0056] 8 is a block diagram of a power management system 7 according to the second embodiment. An acquisition unit 72 acquires the current charge amount of the battery 5, battery location information, charger / discharger location information, and current output of the charger / discharger 4 from each power management device 2, and stores the information in a storage unit 73. The rest of the configuration is the same as the block diagram shown in FIG.

[0057] 9 shows a data table 733 stored in the storage unit 73. The data table 733 stores the device type, the numbers of the grid 3, the charger / discharger 4, and the battery 5, the current location number, the maximum output, the upper limit output, the maximum number of connections, the allowable number of connections, the connection status, the maximum charge amount, and the current charge amount. This is just one example.

[0058] The maximum output in the data table 733 is the maximum output value determined from the specifications of each device. The maximum output of the grid 3 is determined from the specifications of the grid 3. The maximum output of the charger / discharger 4 is determined from the specifications of the charger / discharger 4. The maximum output of the battery 5 is determined from the specifications of the battery 5.

[0059] The upper limit output of grid 3 is the maximum output of grid 3 minus the current output. The current output of grid 3 is equal to the sum of the current outputs of chargers / dischargers 4 connected to grid 3. The upper limit output of chargers / dischargers 4 is the maximum output of chargers / dischargers 4 minus the current output. The upper limit output of battery 5 is the maximum output of battery 5 minus the current output. The rest is the same as the data table shown in FIG. 4.

[0060] In the second embodiment described above, the upper limit output of the grid 3 is calculated based on the maximum output of the grid 3 and the current output of the charger / discharger 4 connected to this grid 3. As a result, when a plurality of charger / dischargers 4 are connected to one grid 3 to perform charging / discharging, the battery 5 can be charged / discharged without the total value of the current outputs of the plurality of charger / dischargers 4 exceeding the maximum output of the grid 3.

[0061] In the first embodiment described above, the upper limit output of the grid 3 stored in the storage unit 73 is determined from the maximum output in the specifications of the grid 3. In this case, the upper limit output of the grid 3 equipped with a renewable energy power source or a load may be determined from a power generation forecast and a demand forecast of the grid 3.

[0062] The third embodiment differs from the first embodiment in that the upper limit output of the grid 3 is determined from the predicted output of the grid 3 for the remaining time determined from the power generation prediction and the demand prediction.

[0063] 10 is a block diagram of a power management system 7 according to the third embodiment. An acquisition unit 72 acquires the remaining time from an input unit 71. The acquisition unit 72 further acquires the current charge amount of the battery 5, battery location information, charger / discharger location information, and the average predicted grid output for the remaining time from each power management device 2, and stores these in a storage unit 73.

[0064] For example, at each base 1, the grid forecast output is determined by subtracting the demand forecast for the load 37 from the power generation forecast for the solar power generation system 33 and the wind power generation system 34, which are renewable energy power generation systems. Note that this is just one example, and the power management system 7 may perform a forecast for each grid 3 and determine the grid forecast output. Furthermore, if the grid 3 is equipped with the solar power generation system 33 or the wind power generation system 34 but is not equipped with the load 37, the power generation forecast for the solar power generation system 33 and the wind power generation system 34, which are renewable energy power generation systems, is used as the grid forecast output. Furthermore, if the grid 3 is not equipped with the solar power generation system 33 or the wind power generation system 34 but is equipped with the load 37, the grid forecast output is determined by multiplying the demand forecast for the load 37 by -1.

[0065] 11 shows a data table 734 stored in the storage unit 73. The data table 734 stores the grid 3 number, the charger / discharger 4 number, the battery 5 number, the current base station number, the predicted output, the upper limit output, the maximum number of connections, the allowable number of connections, the connection availability status, the maximum charge amount, and the current charge amount. This is an example. The predicted output in the data table 734 is the same as the grid predicted output. The rest is the same as the data table shown in FIG. 4.

[0066] 12 is a flowchart showing the processing of the power management system 7. The processing of steps S20 to S21 is the same as the processing of steps S10 to S11 shown in FIG. 6. Thereafter, the acquisition unit 72 acquires the remaining time and acquires the average grid forecast output for the remaining time (step S22). The processing of subsequent steps S23 to S29 is the same as the processing of steps S12 to S18 shown in FIG. 6.

[0067] In the third embodiment described above, the acquisition unit 72 calculates the upper limit output of the grid 3 based on the predicted output of the grid 3 corresponding to the remaining time. This makes it possible to determine the upper limit output of the grid 3 by reflecting the ever-changing amount of power generation from renewable energy and the amount of power demand of the load 37. This makes it possible to determine an equipment combination for responding to a battery request command, and further to charge and discharge the battery 5, even in the grid 3 to which the renewable energy power generation sources such as the solar power generation source 33 and the wind power generation source 34 and the load 37 are connected.

[0068] Fourth Embodiment In the first embodiment described above, the combined upper limit output is determined from the grid upper limit output, the charger / discharger upper limit output, and the battery upper limit output.

[0069] In this case, the combined upper limit output may be further determined based on the time required to move the charger / discharger 4 and the time required to move the battery 5. The fourth embodiment differs from the first embodiment in that the combination determination unit 77 changes whether or not the combination can be used based on the time required to move the charger / discharger 4 and the battery 5 to the base 1.

[0070] 13 is a block diagram of the power management system 7 according to the fourth embodiment. The upper limit output calculation unit 76 acquires the remaining time in addition to the required charge amount from the input unit 71. The upper limit output calculation unit 76 acquires the grid upper limit output, the charger / discharger upper limit output, the battery upper limit output, the maximum charge amount, and also the charger / discharger position information, the battery position information, and the travel time from the storage unit 73.

[0071] 14 shows a travel time table 735 stored in the storage unit 73. The travel time table 735 stores a source base, a destination base, and the travel time required to travel from the source base to the destination base.

[0072] Fig. 15 shows a combined upper limit output table 736 calculated by the upper limit output calculation unit 76. The combined upper limit output table 736 includes the same columns as the combined upper limit output table 732 in Fig. 5, as well as columns for required charge amount, charge / discharge location information, battery location information, remaining time, travel time, charger / discharge location travel time, battery travel time, available charge time, available charge amount, and changed combined upper limit output.

[0073] The required charge amount is the charge amount required for this battery 5. The charge / discharge location information is information indicating the location of the charger / discharger 4 to be paired with this battery 5. The battery location information is information indicating the location of this battery 5. The remaining time is the time remaining until the required charge amount is charged to this battery 5.

[0074] The moving time is the time required to move this battery 5 and the charger / discharger 4 to be combined with this battery 5. The charger / discharger moving time is the time required to move the charger / discharger 4 to be combined with this battery 5. The battery moving time is the time required to move this battery 5.

[0075] The chargeable time is the remaining time minus the travel time, and is the time during which the battery 5 can be charged. The supplyable charge amount is the power that can be supplied after charging the battery 5. The changed combined upper limit output is the upper limit output of the combination after subtracting the travel time.

[0076] The upper limit output calculation unit 76 uses the required charge amount, the remaining time, the travel time, the charger / discharger travel time, the battery travel time, the chargeable time, and the changed combined upper limit output. The required charge amount and the remaining time are acquired from the input unit 71.

[0077] The charger / discharger travel time is determined based on the base number, the charger / discharger location information, and the travel time acquired from the storage unit 73. The battery travel time is determined based on the base number, the battery location information, and the travel time acquired from the storage unit 73.

[0078] The chargeable time is determined based on the remaining time, the charger / discharger movement time, and the battery movement time. The longer of the charger / discharger movement time or the battery movement time is selected, and the value obtained by subtracting it from the remaining time is determined as the chargeable time.

[0079] The available charge amount is determined by multiplying the combined maximum output by the available charge time. Whether the changed combination can be used is determined based on whether the combination can be used, the required charge amount, and the available charge amount. If the available charge amount is smaller than the required charge amount, the combination that was determined to be unavailable is determined to be available after the change.

[0080] The combination determination unit 77 determines the requested device combination based on the requested output, the combined upper limit output, and whether the changed combination is usable. In the fourth embodiment, whether the combination is usable is changed based on the travel time and the supplyable charge amount. This allows the device combination for responding to the battery request command to be determined taking into account the time required to travel the charger / discharger 4 and the battery 5, and the battery 5 can be charged / discharged using this combination.

[0081] Fifth Embodiment In this embodiment, the battery 5 with the greatest current charge amount is selected, and the number of the battery 5 and its placement at the base 1 are determined.

[0082] 16 is a block diagram of the power management system 7 of the fifth embodiment. An input unit 71 accepts input of the required charge amount and remaining time from the battery reservation system 6, but does not accept input of the battery number.

[0083] The required output calculation unit 75 calculates the required output from the required charge amount and the remaining time. The required output calculation unit 75 calculates the required output by dividing the required charge amount by the remaining time. The combination determination unit 77 determines a new required device combination based on the required output, the combined upper limit output, and whether the combination can be used, and outputs the required device combination and the required output to the command unit 78. Here, the combination determination unit 77 determines the required device combination including the battery 5 with the largest current charge amount, and the battery number of that battery 5.

[0084] The command unit 78 transmits a charger / discharger movement command value for moving the position of the charger / discharger 4, a battery movement command value for moving the position of the battery 5, a power command value for charging and discharging the battery, and the battery number of the battery 5 based on the required output, the required equipment combination, the charger / discharger position information, the battery position information, and the battery number.

[0085] The configuration and effects of this embodiment will be described below. [1] A power management system (7) that determines the placement of chargers and dischargers and batteries on a plurality of grids having fixed power sources, comprising: an input unit (71) that receives an input of a required charge amount of the battery and a remaining time until the battery is charged to the required charge amount; an acquisition unit (72) that acquires a current charge amount of the battery; a required output calculation unit (75) that determines a required output of the battery based on the required charge amount of the battery and the remaining time until the battery is charged to the required charge amount; a memory unit (73) that stores an upper limit output of the grid, an upper limit output of the charger / discharger, and an upper limit output of the battery; an upper limit output calculation unit (76) that calculates an upper limit output of each combination of the grid, the charger / discharger, and the battery based on the upper limit output of the grid, the upper limit output of the charger / discharger, and the upper limit output of the battery stored in the memory unit; and a combination determination unit (77) that determines the placement of the charger / discharger and the battery on the grid based on the required output of the battery and the upper limit output of each combination of the grid, the charger / discharger, and the battery. A power management system (7) comprising:

[0086] This allows the allocation of the grid, chargers, and batteries appropriate for the required battery charge amount to be determined, and ensures the charge / discharge rate required to achieve the planned charge amount.

[0087] [2] The power management system (7) according to claim 1, characterized in that the acquisition unit (72) further acquires location information of the chargers / dischargers and location information of the batteries, and includes a command unit (78) that transmits movement command values ​​for the chargers / dischargers and the batteries based on the arrangement of the chargers / dischargers and the batteries on the grid determined by the combination determination unit (77).

[0088] This allows the power management system (7) to move chargers and dischargers and batteries at each site to a site with a grid that allows them to be charged appropriately and suitably.

[0089] [3] The power management system (7) according to claim 1, characterized in that, when there is no combination of the grid, the charger / discharger, and the battery that satisfies the required output of the battery, the combination determination unit (77) modifies at least one of the required charge amount of the battery and the remaining time of the battery.

[0090] This allows the power management system (7) to secure the remaining time required for charging or to search for the required charging amount that is possible within the remaining time.

[0091] [4] The power management system (7) according to claim 1, characterized in that the acquisition unit (72) further acquires information on whether the grid can be connected, information on whether the charger / discharger can be connected, and information on whether the battery can be connected, and the combination determination unit (77) further determines the placement of the charger / discharger and the battery to the grid based on the information on whether the grid can be connected, information on whether the charger / discharger can be connected, and information on whether the battery can be connected acquired by the acquisition unit (72).

[0092] This allows you to exclude combinations of devices that cannot be connected because they are currently being charged, for example.

[0093] [5] The power management system (7) according to claim 1, characterized in that the acquisition unit (72) acquires combined use availability information indicating whether the charger / discharger is charging or discharging and combined use availability information indicating whether the battery is charging or discharging, and the combination determination unit (77) further determines the placement of the charger / discharger and the battery on the grid based on the combined use availability information of the charger / discharger and the combined use availability information of the battery acquired by the acquisition unit (72).

[0094] This allows you to exclude combinations of devices that cannot be connected because they are currently being charged, for example.

[0095] [6] The power management system (7) according to claim 1, characterized in that: the memory unit (73) stores a maximum output of the grid, a maximum output of the charger / discharger, and a maximum output of the battery; and the upper limit output calculation unit (76) determines an upper limit output of the grid, an upper limit output of the charger / discharger, and an upper limit output of the battery based on the maximum output of the grid, the maximum output of the charger / discharger, and the maximum output of the battery.

[0096] [7] The power management system (7) according to claim 1, characterized in that: the acquisition unit (72) acquires a current maximum output of the grid, a current maximum output of a charger / discharger connected to the grid, and a current maximum output of a battery connected to the grid; and the upper limit output calculation unit (76) determines an upper limit output of the grid, an upper limit output of the charger / discharger, and an upper limit output of the battery based on the current maximum output of the grid, the current maximum output of the charger / discharger connected to the grid, and the current maximum output of the battery connected to the grid acquired by the acquisition unit (72).

[0097] This makes it possible to calculate the upper limit output of the grid, charger / discharger, and battery from the maximum output in the specifications of the grid, charger / discharger, and battery.

[0098] [8] The power management system (7) according to claim 1, characterized in that the acquisition unit (72) acquires a current output of a charger / discharger connected to the grid and a current output of a battery connected to the grid, and the upper limit output calculation unit (76) determines an upper limit output of the grid based on the current output of the charger / discharger and the current output of the battery acquired by the acquisition unit (72).

[0099] This allows the batteries to be charged and discharged within a range that does not exceed the maximum output of the grid, even when multiple chargers and dischargers and batteries are connected to one grid.

[0100] [9] The power management system according to claim 1, wherein the upper limit output calculation unit (76) determines the upper limit output of the grid based on at least one of a power generation forecast and a demand forecast of renewable energy.

[0101] This makes it possible to determine an appropriate combination of chargers / dischargers and batteries even when the grid output fluctuates from moment to moment.

[0102]

[10] The power management system according to claim 1, wherein the upper limit output calculation unit (76) subtracts the time required for the charger / discharger or the battery to be moved to another grid from the remaining time.

[0103] This allows the allocation of the grid, charger / discharger, and battery to the required battery charge amount to be determined while taking travel time into consideration.

[0104]

[11] The power management system according to claim 1, wherein a charger / discharger connection unit (42) that connects the charger / discharger to the grid and a battery connection unit (44) that connects the battery to the charger / discharger are configured with a DC circuit.

[0105] This allows a DC voltage to be applied directly to the charger / discharger.

[0106]

[12] The power management system according to claim 1, wherein the grid, the charger / discharger, and the battery are each configured with a DC circuit and are charged / discharged by DC.

[0107] This allows a DC voltage to be applied directly to the charger / discharger and the battery.

[0108]

[13] A power supply system (8) comprising a power system and a power management system (7), wherein the power system comprises at least one of a plurality of grids having fixed power sources, chargers / dischargers, and batteries, wherein the chargers / dischargers comprise a charger / discharger connection unit (42) that connects the charger / discharger to the grid, and a battery connection unit (44) that connects the battery to the charger / discharger, an input unit (71) that inputs the current charge amount of the battery, the required charge amount of the battery, and the remaining time until the required charge amount is reached, a required output calculation unit (75) that determines the required output of the battery based on the current charge amount of the battery, the required charge amount of the battery, and the remaining time until the required charge amount is reached, and a memory unit (73) that stores the upper limit output of the grid, the upper limit output of the charger / discharger, and the upper limit output of the battery, an upper limit output calculation unit (76) that calculates an upper limit output of each combination of the grid, the charger / discharger, and the battery based on an upper limit output of the grid, an upper limit output of the charger / discharger, and an upper limit output of the battery; and a combination determination unit (77) that determines an arrangement of the charger / discharger and the battery on the grid based on a required output of the battery and an upper limit output of each combination of the grid, the charger / discharger, and the battery.

[0109] This allows the allocation of the grid, chargers, and batteries appropriate for the required battery charge amount to be determined, and ensures the charge / discharge rate required to achieve the planned charge amount.

[0110]

[14] A power management system that determines allocation of chargers and dischargers and batteries to a plurality of grids having fixed power sources, comprising: an input unit (71) that inputs a required charge amount of the battery and a remaining time until the required charge amount is reached; a required output calculation unit (75) that determines a required output of the battery based on the required charge amount of the battery and the remaining time until the required charge amount is reached input by the input unit (71); a memory unit (73) that stores an upper limit output of the grid, an upper limit output of the charger / discharger, and an upper limit output of the battery; an upper limit output calculation unit (76) that calculates an upper limit output of each combination of the grid, the charger / discharger, and the battery based on the upper limit output of the grid, the upper limit output of the charger / discharger, and the upper limit output of the battery stored in the memory unit; and a combination determination unit (77) that determines an arrangement of the charger / discharger and the battery on the grid and a battery number to be used based on the required output of the battery and the upper limit output of each combination of the grid, the charger / discharger, and the battery.

[0111] This allows the allocation of the grid, chargers, and batteries appropriate for the required battery charge amount to be determined, and ensures the charge / discharge rate required to achieve the planned charge amount.

[0112] (Modifications) The present invention is not limited to the above-described embodiments and includes various modifications. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those including all of the described configurations. It is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Furthermore, it is also possible to add, delete, or replace part of the configuration of each embodiment with other configurations.

[0113] The above-described configurations, functions, processing units, processing means, etc. may be implemented in part or in whole by hardware such as an integrated circuit. The above-described configurations, functions, etc. may also be implemented by software, with a processor interpreting and executing a program that implements each function. Information such as the program, table, and file that implements each function can be stored in a recording device such as a memory, a hard disk, or an SSD (Solid State Drive), or on a recording medium such as a flash memory card or a DVD (Digital Versatile Disk).

[0114] In each embodiment, the control lines and information lines shown are those that are considered necessary for the explanation, and not all control lines and information lines in the product are necessarily shown. In reality, it can be considered that almost all components are interconnected.

[0115] DESCRIPTION OF SYMBOLS 1, 1A to 1L Base 2 Power management device 3, 3A to 3L Grid 31 Grid management device 32 Power distribution system 321 AC / DC converter 33 Photovoltaic power generation 331 DC / DC converter 34 Wind power generation 341 AC / DC converter 35 Diesel power generation 351 AC / DC converter 36 Battery 361 DC / DC converter 37 Load 371 AC / DC converter 381 Connection part 382 Connection part 383 Connection part 4, 4A, 4B Charger / discharger 4 Charger / discharger 42 Connection part 44 Connection part 43 Converter 41 Charger / discharger management device 5 Battery 52 Connection part 53 Battery module 51 Battery management device 6 Battery reservation system 61 User terminal 62 Movement command screen 621 Movement command pane 622 Map pane 7 Power management system 71 Input unit 72 Acquisition unit 73 Storage unit 74 Calculation unit 78 Command unit 75 Required output calculation unit 76 Upper limit output calculation unit 77 Combination determination unit 731 Data table 732 Combination upper limit output table 733 Data table 734 Data table 735 Travel time table 736 Combination upper limit output table 8 Power supply system 9 Internet

Claims

1. A power management system for determining the placement of chargers and batteries to a plurality of grids having a fixed power source, comprising: - an input unit that receives an input of a required charge amount of the battery and a remaining time until the required charge amount is charged; - an acquisition unit that acquires a current charge amount of the battery; - a required output calculation unit that determines a required output of the battery based on the required charge amount of the battery and the remaining time until the required charge amount is charged; - a storage unit that stores an upper limit output of the grid, an upper limit output of the charger, and an upper limit output of the battery; - an upper limit output calculation unit that calculates an upper limit output of each combination of the grid, the charger, and the battery based on the upper limit output of the grid, the upper limit output of the charger, and the upper limit output of the battery stored in the storage unit; - a combination determination unit that determines the placement of the charger and the battery to the grid based on the required output of the battery and the upper limit output of each combination of the grid, the charger, and the battery.

2. The acquisition unit further acquires position information of the charger and position information of the battery, and includes a command unit that transmits a movement command value of the charger and the battery based on the placement of the charger and the battery to the grid determined by the combination determination unit.

3. When there is no combination of the grid, the charger, and the battery that satisfies the required output of the battery, the combination determination unit corrects at least one of the required charge amount of the battery and the remaining time of the battery.

4. The acquisition unit further acquires connection availability information of the grid, connection availability information of the charger, and connection availability information of the battery, and the combination determination unit further determines the placement of the charger and the battery to the grid based on the connection availability information of the grid, the connection availability information of the charger, and the connection availability information of the battery acquired by the acquisition unit.

5. The acquisition unit acquires combination use permission information indicating whether the charger is in the process of charging or discharging, and combination use permission information indicating whether the battery is in the process of charging or discharging. The combination determination unit further determines the arrangement of the charger and the battery to the grid based on the combination use permission information of the charger acquired by the acquisition unit and the combination use permission information of the battery. The power management system according to claim 1, characterized in that.

6. The storage unit stores the maximum output of the grid, the maximum output of the charger, and the maximum output of the battery. The upper limit output calculation unit determines the upper limit output of the grid, the upper limit output of the charger, and the upper limit output of the battery based on the maximum output of the grid, the maximum output of the charger, and the maximum output of the battery. The power management system according to claim 1, characterized in that.

7. The acquisition unit acquires the current maximum output of the grid, the current maximum output of the charger connected to the grid, and the current maximum output of the battery connected to the grid. The upper limit output calculation unit determines the upper limit output of the grid, the upper limit output of the charger, and the upper limit output of the battery based on the current maximum output of the grid acquired by the acquisition unit, the current maximum output of the charger connected to the grid, and the current maximum output of the battery connected to the grid. The power management system according to claim 1, characterized in that.

8. The acquisition unit acquires the current output of the charger connected to the grid and the current output of the battery connected to the grid. The upper limit output calculation unit determines the upper limit output of the grid based on the current output of the charger acquired by the acquisition unit and the current output of the battery. The power management system according to claim 1, characterized in that.

9. The upper limit output calculation unit determines the upper limit output of the grid based on at least one or more of the power generation prediction and demand prediction of renewable energy. The power management system according to claim 1, characterized in that.

10. When the upper limit output calculation unit moves the charger or the battery to another grid, it reduces the remaining time by the time required for the movement. The power management system according to claim 1, characterized in that.

11. The charger connection part connecting the charger and the grid, and the battery connection part connecting the battery and the charger are constituted by a DC circuit. The power management system according to claim 1, characterized in that.

12. The grid, the charger, and the battery are each constituted by a DC circuit and are charged and discharged by DC. The power management system according to claim 1, characterized in that.

13. A power supply system including a power grid and a power management system, the power grid including at least one of a plurality of grids having a fixed power source, a charger, and a battery, the charger including a charger connection part connecting the charger to the grid and a battery connection part connecting the battery to the charger, an input part for inputting the current charge amount of the battery, the required charge amount of the battery, and the remaining time until the required charge amount, a required output calculation part for determining the required output of the battery based on the current charge amount of the battery, the required charge amount of the battery, and the remaining time until the required charge amount, a storage part for storing the upper limit output of the grid, the upper limit output of the charger, and the upper limit output of the battery, an upper limit output calculation part for calculating the upper limit output of each combination of the grid, the charger, and the battery based on the upper limit output of the grid, the upper limit output of the charger, and the upper limit output of the battery, and a combination determination part for determining the arrangement of the charger and the battery to the grid based on the required output of the battery and the upper limit output of each combination of the grid, the charger, and the battery. A power supply system characterized by comprising.

14. A power management system for determining the allocation of a charger for charging and discharging to a plurality of grids having a fixed power source and a battery, comprising: an input unit for inputting a required charge amount of the battery and a remaining time until the required charge amount; a required output calculation unit for determining a required output of the battery based on the required charge amount of the battery input by the input unit and the remaining time until the required charge amount; a storage unit for storing an upper limit output of the grid, an upper limit output of the charger, and an upper limit output of the battery; an upper limit output calculation unit for calculating an upper limit output of each combination of the grid, the charger, and the battery based on the upper limit output of the grid, the upper limit output of the charger, and the upper limit output of the battery stored in the storage unit; and a combination determination unit for determining the arrangement of the charger and the battery to the grid and the battery number to be used based on the required output of the battery and the upper limit output of each combination of the grid, the charger, and the battery. A power management system characterized by the above.

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