Power System

Abstract

To provide an electrical power system capable of achieving shortening of power supply time.SOLUTION: An electrical power system 1 includes: a power generation section 3 for executing power generation by renewable energy; a power storage section charged by power supply from the power generation section 3; a charger 5 connected with an electric motor car V and for charging the power storage section by power supply from the electric motor car V; a converter 13 for outputting electric power supplied from the power storage section; and a controller 11 for controlling various types of operations. The feed power amount per unit time supplied to the power storage section from the charger 5 is more than the output power amount per unit time supplied to the converter 13 from the power storage section.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a power supply system. [Background technology]

[0002] BACKGROUND ART There is known a so-called V2L (Vehicle to Load) technology in which power is supplied from an electric vehicle or other electric vehicle equipped with a large-capacity battery to a load such as a home appliance (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-107879 Summary of the Invention [Problem to be solved by the invention]

[0004] In an independent power supply facility, a storage battery is charged using renewable energy sources such as solar power generation, and the battery supplies power to a load. This allows the independent power supply facility to supply power to a load without receiving power from a commercial power source. However, the capacity of the storage battery in an independent power supply facility is limited. Therefore, for example, if a large-scale power outage occurs due to a disaster or other reason and a large amount of power needs to be supplied to the load, it may be impossible to supply sufficient power through renewable energy generation alone. Therefore, it is possible for the independent power supply facility to receive power from electric vehicles using the above-mentioned V2L technology. In this configuration, if a large-scale power outage occurs, it may be necessary for electric vehicles to supply power to multiple independent power supply facilities. In this case, in order for electric vehicles to quickly supply power to more independent power supply facilities, it is necessary to shorten the time that electric vehicles stay at one independent power supply facility. To achieve this, it is necessary to shorten the time that electric vehicles supply power to the independent power supply facility.

[0005] An object of the present invention is to provide a power supply system that can shorten the power supply time. [Means for solving the problem]

[0006] The power supply system of the present invention includes a power generation unit that generates electricity using renewable energy, a power storage unit that is charged by power supplied from the power generation unit, a charging unit to which an electric vehicle is connected and that charges the power storage unit by power supplied from the electric vehicle, an output unit that outputs power supplied from the power storage unit, and a control unit that controls various operations, and the amount of power supplied per unit time from the charging unit to the power storage unit is greater than the amount of power output per unit time supplied from the power storage unit to the output unit.

[0007] In the power supply system according to the present invention, the amount of power supply per unit time supplied from the charging unit to the power storage unit is greater than the amount of power output per unit time supplied from the power storage unit to the output unit. As a result, when an electric vehicle is connected to the charging unit, the power supply system can charge the power storage unit in a short time. Therefore, the power supply system can shorten the time it takes for power to be supplied from the electric vehicle.

[0008] The power storage unit may include a first power storage unit and a second power storage unit, the first power storage unit being charged by the charging unit, the second power storage unit being charged by power supplied from the power generation unit and the first power storage unit, the amount of charge / discharge power per unit time of the first power storage unit being greater than the amount of charge / discharge power per unit time of the second power storage unit, and the storage capacity of the second power storage unit being greater than the storage capacity of the first power storage unit. In this configuration, the amount of charge / discharge power per unit time of the first power storage unit is greater than the amount of charge / discharge power per unit time of the second power storage unit, so that the first power storage unit can be charged in a short time from the electric vehicle via the charging unit. Furthermore, the storage capacity of the second power storage unit is greater than the storage capacity of the first power storage unit, so that power can be sufficiently stored in the second power storage unit. Therefore, sufficient power can be supplied to the load.

[0009] The control unit may output the power supplied from the power generation unit to the second power storage unit or the output unit while the charging unit is charging the first power storage unit. In this configuration, while the first power storage unit is being charged, the second power storage unit can be charged or power can be output from the output unit to the load.

[0010] The control unit may start charging the second power storage unit from the first power storage unit when charging of the first power storage unit by the charging unit is completed. The completion of charging of the first power storage unit by the charging unit may include a case where the first power storage unit is fully charged or a case where the connection between the charging unit and the electric vehicle is released. In this configuration, the second power storage unit can be charged by power supplied from the first power storage unit.

[0011] The power supply system may include a switching unit that switches between power supply from the second power storage unit to the output unit and direct power supply from the electric vehicle to the output unit via the charging unit, and the control unit may control the switching operation of the switching unit. With this configuration, power can be directly supplied from the electric vehicle to the output unit.

[0012] The control unit may control the switching unit to supply power directly from the electric vehicle to the output unit when the electric vehicle is connected to the charging unit after the first power storage unit is fully charged by charging by the charging unit. In this configuration, when the first power storage unit is fully charged, power is supplied directly from the electric vehicle to the output unit. Therefore, power supply from the electric vehicle can be effectively utilized.

[0013] When the second power storage unit is fully charged by power supply from the first power storage unit to the second power storage unit, and the electric vehicle is connected to the charging unit, the control unit may cause the charging unit to charge the first power storage unit. With this configuration, when charging of the second power storage unit from the first power storage unit is completed and the amount of charge of the first power storage unit is low, the first power storage unit can be charged by power supply from the electric vehicle.

[0014] When the electric vehicle is connected to the charging unit, the control unit may calculate a charge amount of the first power storage unit, calculate a planned charging capacity necessary to fully charge the first power storage unit, obtain a remaining charge amount of the storage battery of the electric vehicle, calculate a supplyable capacity that can be supplied from the storage battery, and, before starting charging of the first power storage unit, compare the planned charging capacity with the supplyable capacity, and set the smaller of the planned charging capacity and the supplyable capacity as the capacity to charge the first power storage unit. With this configuration, it is possible to avoid charging the first power storage unit beyond the supplyable capacity of the storage battery of the electric vehicle.

[0015] The power supply system of the present invention includes a power generation unit that generates power using renewable energy, a power storage unit that is charged by power supplied from the power generation unit, a connection unit to which an electric vehicle is connected, an output unit that outputs power to a load, a switching unit that switches between power supply from the power storage unit to the output unit and direct power supply from the electric vehicle to the output unit via the connection unit, and a control unit that controls the switching operation of the switching unit.

[0016] In the power supply system according to the present invention, the switching unit switches between power supply from the power storage unit to the output unit and direct power supply from the electric vehicle to the output unit via the connection unit. This allows power to be directly supplied from the electric vehicle to the output unit. Therefore, power can be quickly supplied from the electric vehicle to the load. [Effects of the Invention]

[0017] According to the present invention, it is possible to shorten the power supply time. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a diagram showing a power supply system according to an embodiment. [Figure 2] FIG. 2 is a diagram illustrating the configuration of the controller. [Figure 3] FIG. 3 is a diagram illustrating the operation of the power supply system. [Figure 4] FIG. 4 is a diagram illustrating the operation of the power supply system. [Figure 5] FIG. 5 is a diagram showing a power supply system according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or corresponding elements are designated by the same reference numerals, and redundant description will be omitted.

[0020] Fig. 1 is a diagram showing a power supply system according to one embodiment. The power supply system 1 shown in Fig. 1 is a system that stores power generated by a power generation unit 3 and supplies the power to a load L. The power supply system 1 is an independent power supply system that can supply power to the load L without receiving power from a commercial power source. The power supply system 1 can be installed, for example, as an independent power supply facility (independent distribution board).

[0021] The power supply system 1 can receive power from a storage battery B of an electric vehicle V such as an EV (Electric Vehicle), a PHV (Plug-in Hybrid Vehicle), or an FCV (Fuel Cell Vehicle).

[0022] The power supply system 1 includes a power generation unit 3, a charger (charging unit) 5, a first storage battery (storage unit, first storage unit) 7, a second storage battery (storage unit, second storage unit) 9, a controller (control unit) 11, a converter (output unit) 13, a DC load 15, a first switch 17, and a second switch (switching unit) 19.

[0023] The power generation unit 3 generates power using renewable energy. The power generation unit 3 may be, for example, a solar power generation unit, a wind power generation unit, or the like. In this embodiment, the power generation unit 3 is a photovoltaic (PV) power generation unit. The power generation unit 3 is electrically connected to the controller 11. The power generation unit 3 outputs the generated power to the controller 11.

[0024] The charger 5 charges the first storage battery 7. The charger 5 and electric vehicle V are connected by a charging cable C. Power is supplied to the charger 5 from the storage battery B of the electric vehicle V. The charger 5 and the controller 11 are connected so that they can communicate with each other. The charger 5 controls the charging current based on a charging instruction sent from the controller 11, and charges the first storage battery 7. When the second switch 19 connects the charger 5 to the converter 13, the charger 5 outputs power supplied from the storage battery B of the electric vehicle V to the converter 13 via the second switch 19.

[0025] The first storage battery 7 is charged by power supplied from the electric vehicle V. The first storage battery 7 may be, for example, a lead-acid battery, a lithium-ion secondary battery, or the like. The amount of charge / discharge power per unit time of the first storage battery 7 is greater than the amount of charge / discharge power per unit time of the second storage battery 9. In other words, the amount of charge / discharge power per unit time of the second storage battery 9 is less than the amount of charge / discharge power per unit time of the first storage battery 7. That is, in the power supply system 1, the amount of power supply per unit time supplied from the charger 5 to the first storage battery 7 is greater than the amount of output power per unit time supplied from the second storage battery 9 to the converter 13 via the controller 11. The amount of charge / discharge power per unit time of the first storage battery 7 is, for example, 1000 Wh. The amount of charge / discharge power per unit time of the second storage battery 9 is, for example, 100 Wh. The first storage battery 7 is a so-called high-output storage battery.

[0026] The first storage battery 7 supplies power to the second storage battery 9 and / or the controller 11. The first storage battery 7 is connected to the charger 5, or to the second storage battery 9 and the controller 11. The first storage battery 7 is connected to the charger 5, or to the second storage battery 9 and the controller 11 by switching a first switch 17. When connected to the charger 5, the first storage battery 7 is charged with power supplied from the electric vehicle V. When connected to the second storage battery 9 and the controller 11, the first storage battery 7 supplies power to the second storage battery 9 and / or the controller 11.

[0027] The second storage battery 9 is charged by power supplied from the power generation unit 3. The second storage battery 9 is also charged by power supplied from the first storage battery 7. The second storage battery 9 may be, for example, a lead-acid battery or a lithium-ion secondary battery. The storage capacity of the second storage battery 9 is larger than that of the first storage battery 7. The storage capacity of the second storage battery 9 is, for example, 30 Ah. The storage capacity of the first storage battery 7 is, for example, 10 Ah. The second storage battery 9 is a so-called high-capacity storage battery. The second storage battery 9 is connected to the first storage battery 7 via a first switch 17. The second storage battery 9 is connected to the controller 11. The second storage battery 9 supplies power to the controller 11.

[0028] The controller 11 comprehensively controls various operations in the power supply system 1. The controller 11 is composed of a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc., and an input / output interface, etc. Various programs or data can be stored in the ROM.

[0029] The controller 11 is electrically connected to the power generation unit 3, the second storage battery 9, and the DC load 15. The controller 11 is connected to the first storage battery 7 via a first switch 17. The controller 11 is connected to the converter 13 via a second switch 19. The controller 11 is connected to a voltmeter 21 that is connected to the output terminal of the first storage battery 7. The controller 11 is connected to the first switch 17 and the second switch 19. The controller 11 is connected to the electric vehicle V and the charger 5 so that they can communicate with each other.

[0030] The controller 11 outputs power supplied from at least one of the power generation unit 3, the first storage battery 7, and the second storage battery 9 to the converter 13 and / or the DC load 15. The controller 11 outputs power supplied from the power generation unit 3 to the second storage battery 9. FIG. 2 is a diagram showing the configuration of the controller 11. As shown in FIG. 2, the controller 11 has an input unit 110, a communication unit 112, a measurement unit 114, a control unit 116, and an output unit 118.

[0031] The input unit 110 inputs power supplied from the power generation unit 3, the first storage battery 7, and the second storage battery 9. The communication unit 112 communicates with the electric vehicle V and the charger 5. The communication unit 112 receives remaining amount information indicating the remaining charge amount transmitted from the electric vehicle V. The communication unit 112 outputs the received remaining amount information to the control unit 116. The communication unit 112 transmits a charging instruction to the charger 5.

[0032] The measurement unit 114 measures the voltage of the first storage battery 7 based on the output of the voltmeter 21 connected to the output terminal of the first storage battery 7. The measurement unit 114 measures the voltage of the second storage battery 9. The measurement unit 114 outputs the measurement result to the control unit 116.

[0033] The control unit 116 sets the capacity to be charged to the first storage battery 7. When the charging cable C is connected to the electric vehicle V, the control unit 116 calculates the charge amount of the first storage battery 7 and calculates the planned charging capacity necessary to fully charge the first storage battery 7. Specifically, the control unit 116 acquires the voltage of the first storage battery 7 based on the measurement result of the measurement unit 114 and calculates the planned charging capacity. The control unit 116 acquires the remaining charge amount of the storage battery B of the electric vehicle V based on the remaining amount information output from the communication unit 112 and calculates the available supply capacity that can be supplied from the storage battery B. Before starting to charge the first storage battery 7, the control unit 116 compares the planned charging capacity with the available supply capacity and sets the smaller of the planned charging capacity or the available supply capacity as the capacity to be charged to the first storage battery 7. The control unit 116 generates a charge instruction based on the set capacity and outputs the charge instruction to the communication unit 112.

[0034] The control unit 116 controls the charging of the second storage battery 9. The control unit 116 acquires the voltage of the second storage battery 9 based on the measurement result of the measurement unit 114, and calculates the charge capacity required to fully charge the second storage battery 9. The control unit 116 controls the charge current based on the charge capacity, and charges the second storage battery 9.

[0035] The control unit 116 controls the switching operations of the first switch 17 and the second switch 19. The control unit 116 controls the switching operations of the first switch 17 and the second switch 19 based on the connection state of the electric vehicle V to the charger 5 and the charge amount of the first storage battery 7.

[0036] The output unit 118 outputs electric power. The output unit 118 outputs electric power to the second storage battery 9. The output unit 118 outputs electric power to the converter 13 via the second switch 19. The output unit 118 outputs electric power to the DC load 15.

[0037] As shown in FIG. 1 , the converter 13 outputs the power output from the second storage battery 9. In this embodiment, the converter 13 is a DC / AC converter. The converter 13 converts DC power into AC power and outputs it to the load L. The converter 13 is connected to the charger 5 or the controller 11. The converter 13 is connected to the charger 5 or the controller 11 via a second switch 19. When connected to the controller 11, the converter 13 converts the power supplied from the second storage battery 9 and outputs it to the load L. When connected to the charger 5, the converter 13 converts the power supplied from the electric vehicle V and outputs it to the load L.

[0038] In the output unit (converter 13) in claim 1, "outputting electric power supplied from the power storage unit" means outputting electric power supplied from at least the power storage unit (first storage battery 7, second storage battery 9). In this embodiment, the converter 13 can also output electric power supplied from the power generation unit 3 and the electric vehicle V.

[0039] The DC load 15 is, for example, a light. The DC load 15 is connected to the controller 11. The DC load 15 is supplied with power from at least one of the power generation unit 3, the first storage battery 7, and the second storage battery 9 via the controller 11.

[0040] The first switch 17 is provided on the input side of the first storage battery 7 (the output side of the charger 5 and the input side of the second storage battery 9). The first switch 17 switches between power supply from the charger 5 to the first storage battery 7 and charging from the first storage battery 7 to the second storage battery 9 and / or the controller 11. The first switch 17 switches its operation in response to a switching signal output from the controller 11.

[0041] The second switch 19 is provided on the input side of the converter 13 (the output side of the controller 11, the output side of the charger 5). The second switch 19 switches between power supply from the second storage battery 9 to the converter 13 and direct power supply from the electric vehicle V to the converter 13 via the charger 5. The second switch 19 switches its operation in response to a switching signal output from the controller 11.

[0042] Next, the operation of the power supply system 1 will be described with reference to FIGS.

[0043] (Step 1) As shown in FIG. 1 , when an electric vehicle V is first connected to the charger 5 via a charging cable C, the controller 11 calculates the planned charging capacity and the available supply capacity, sets the charge amount of the first storage battery 7, and transmits a charging instruction to the charger 5. The controller 11 also controls the operation of the first switch 17 so that power is supplied from the charger 5 to the first storage battery 7. As a result, the first switch 17 connects the charger 5 and the first storage battery 7. The charger 5 charges the first storage battery 7 based on the charging instruction from the controller 11.

[0044] Furthermore, the controller 11 controls the operation of the second switch 19 so that the controller 11 and the converter 13 are connected. The second switch 19 connects the controller 11 and the converter 13. The controller 11 outputs the power supplied from the power generation unit 3 to the second storage battery 9 or the converter 13 while the charger 5 is charging the first storage battery 7. When the second storage battery 9 is not fully charged, the controller 11 outputs the power supplied from the power generation unit 3 to the second storage battery 9. When a load L is connected to the converter 13, the controller 11 outputs the power output from the power generation unit 3 and / or the second storage battery 9 to the converter 13. Furthermore, the controller 11 outputs power to a DC load 15.

[0045] (Step 2) 3, when charging of the first storage battery 7 by the charger 5 is completed, the controller 11 starts charging from the first storage battery 7 to the second storage battery 9. Charging of the first storage battery 7 by the charger 5 may be completed when the first storage battery 7 is fully charged or when the connection between the charger 5 and the electric vehicle V is released. Here, a case where the first storage battery 7 is fully charged and the connection between the charger 5 and the electric vehicle V is released will be described as an example.

[0046] When charging of the first storage battery 7 by the charger 5 is completed, the controller 11 controls the operation of the first switch 17 so that power is supplied from the first storage battery 7 to the second storage battery 9. The first switch 17 connects the first storage battery 7 and the second storage battery 9 (controller 11). As a result, power is supplied from the first storage battery 7 to the second storage battery 9, and the second storage battery 9 is charged. The controller 11 outputs power from the power generation unit 3 to the converter 13 and / or the DC load 15.

[0047] (Step 3) As shown in FIG. 4 , after the first storage battery 7 is fully charged by power supplied from the electric vehicle V, when the electric vehicle V is connected to the charger 5, the controller 11 controls the second switch 19 to supply power directly from the electric vehicle V to the converter 13. In the state shown in FIG. 1 , when the first storage battery 7 is fully charged and the electric vehicle V remains connected to the charger 5, the controller 11 controls the first switch 17 and the second switch 19. Specifically, the controller 11 controls the operation of the first switch 17 to supply power from the first storage battery 7 to the second storage battery 9. As a result, power is supplied from the first storage battery 7 to the second storage battery 9, and the second storage battery 9 is charged. When the second storage battery 9 is fully charged, power is supplied to the controller 11 from the first storage battery 7 and the second storage battery 9.

[0048] Furthermore, the controller 11 controls the operation of the second switch 19 so that the charger 5 and the converter 13 are connected. This enables direct power supply from the electric vehicle V to the converter 13 via the charger 5. When the supply of power from the electric vehicle V to the load L starts, the controller 11 obtains the remaining charge amount of the storage battery B of the electric vehicle V based on the remaining amount information. When the remaining charge amount of the storage battery B becomes equal to or less than a threshold, the controller 11 transmits a stop instruction to the electric vehicle V to stop the supply of power to the converter 13 (load L). This stops the supply of power from the electric vehicle V. Furthermore, the controller 11 controls the operation of the second switch 19 so that the controller 11 and the converter 13 are connected. This allows power to be supplied from the controller 11 to the converter 13.

[0049] (Step 4) When the second storage battery 9 is fully charged due to power supply from the first storage battery 7 to the second storage battery 9, and when the electric vehicle V is connected to the charger 5, the controller 11 causes the charger 5 to charge the first storage battery 7, as shown in FIG. 1 . The controller 11 controls the operation of the first switch 17 so that power is supplied from the charger 5 to the first storage battery 7. As a result, the first switch 17 connects the charger 5 and the first storage battery 7. The charger 5 charges the first storage battery 7 based on a charging instruction from the controller 11.

[0050] As described above, in the power supply system 1 according to this embodiment, the amount of power supply per unit time supplied from the charger 5 to the first storage battery 7 is greater than the amount of output power per unit time supplied from the second storage battery 9 to the converter 13 via the controller 11. As a result, in the power supply system 1, when the electric vehicle V is connected to the charger 5, the first storage battery 7 can be charged in a short time. Therefore, in the power supply system 1, it is possible to shorten the time it takes for the electric vehicle V to supply power. As a result, the electric vehicle V can supply power to many independent power supply facilities.

[0051] In the power supply system 1 according to this embodiment, the amount of charge / discharge power per unit time of the first storage battery 7 is greater than the amount of charge / discharge power per unit time of the second storage battery 9. The storage capacity of the second storage battery 9 is greater than the storage capacity of the first storage battery 7. In this configuration, the amount of charge / discharge power per unit time of the first storage battery 7 is greater than the amount of charge / discharge power per unit time of the second storage battery 9, so that the first storage battery 7 can be charged in a short time from the electric vehicle V via the charger 5. Furthermore, the storage capacity of the second storage battery 9 is greater than the storage capacity of the first storage battery 7, so that the second storage battery 9 can store a sufficient amount of power. Therefore, a sufficient amount of power can be supplied to the load L.

[0052] In the power supply system 1 according to this embodiment, the controller 11 outputs the power supplied from the power generation unit 3 to the second storage battery 9 or the converter 13 while the charger 5 is charging the first storage battery 7. In this configuration, while the first storage battery 7 is being charged, the second storage battery 9 can be charged or power can be output from the converter 13 to the load L.

[0053] In the power supply system 1 according to this embodiment, when charging of the first storage battery 7 by the charger 5 is completed, the controller 11 starts charging from the first storage battery 7 to the second storage battery 9. In this configuration, the second storage battery 9 can be charged by power supplied from the first storage battery 7.

[0054] The power supply system 1 according to this embodiment includes a second switch 19 that switches between power supply from the second storage battery 9 to the converter 13 via the controller 11 and direct power supply from the electric vehicle V to the converter 13 via a charger. The controller 11 controls the switching operation of the second switch 19. With this configuration, power can be directly supplied from the electric vehicle V to the converter 13.

[0055] In the power supply system 1 according to this embodiment, when the first storage battery 7 is fully charged by power supplied from the electric vehicle V and the electric vehicle V is connected to the charger 5, the controller 11 controls the second switch 19 to supply power directly from the electric vehicle V to the converter 13. In this configuration, when the first storage battery 7 is fully charged, power is supplied directly from the electric vehicle V to the converter 13. Therefore, the power supply from the electric vehicle V can be effectively utilized.

[0056] In the power supply system 1 according to this embodiment, when the second storage battery 9 is fully charged by power supply from the first storage battery 7 to the second storage battery 9, and when the electric vehicle V is connected to the charger 5, the controller 11 causes the charger 5 to charge the first storage battery 7. In this configuration, when charging of the second storage battery 9 from the first storage battery 7 is completed and the charge amount of the first storage battery 7 becomes low, the first storage battery 7 can be charged by power supply from the electric vehicle V.

[0057] In the power supply system 1 according to this embodiment, when the electric vehicle V is connected to the charger 5, the controller 11 calculates the charge amount of the first storage battery 7 and calculates the planned charging capacity necessary to fully charge the first storage battery 7. The controller 11 acquires the remaining charge amount of the storage battery B of the electric vehicle V and calculates the supplyable capacity that can be supplied from the storage battery B. Before starting to charge the first storage battery 7, the controller 11 compares the planned charging capacity with the supplyable capacity and sets the smaller of the planned charging capacity and the supplyable capacity as the capacity to be charged to the first storage battery 7. This configuration makes it possible to prevent the first storage battery 7 from being charged at a capacity that exceeds the supplyable capacity of the storage battery B of the electric vehicle V.

[0058] Although the embodiments of the present invention have been described above, the present invention is not necessarily limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present invention.

[0059] In the above embodiment, a solar power generation system is used as the power generation unit 3. However, the power generation unit 3 may be a wind power generation system as described above, or may be another type of power generation system.

[0060] In the above embodiment, an example has been described in which the first storage battery 7 and the second storage battery 9 are provided. However, the number of storage batteries may be one. In this case, it is preferable that the storage battery has high output and high capacity.

[0061] Fig. 5 is a diagram showing a power supply system according to another embodiment. As shown in Fig. 5, the power supply system 1A includes a power generation unit 3, a connector (connection unit) 23, a storage battery 25, a controller (control unit) 11, a converter (output unit) 13, a DC load 15, and a switch 27.

[0062] The connector 23 is connected to the electric vehicle V. The connector 23 and the electric vehicle V are connected by a cable CA. The connector 23 is supplied with power from a storage battery B of the electric vehicle V.

[0063] The control unit 116 (see FIG. 2) of the controller 11 controls the charging of the storage battery 25. The control unit 116 acquires the voltage of the storage battery 25 based on the measurement result of the measurement unit 114 (see FIG. 2), and calculates the charge capacity required to fully charge the storage battery 25. The control unit 116 controls the charge current based on the charge capacity, and charges the storage battery 25. The control unit 116 causes the power from the power generation unit 3, input to the input unit 110, to be output from the output unit 118 to the storage battery 25.

[0064] The control unit 116 controls the switching operation of the switch 27. The control unit 116 controls the switching operation of the switch 27 based on the connection state of the electric vehicle V to the connector 23. When the electric vehicle V is connected to the connector 23 by the cable CA, the control unit 116 controls the operation of the switch 27 so that power is supplied from the electric vehicle V to the converter 13.

[0065] The storage battery 25 is charged by power supplied from the power generation unit 3. The storage battery 25 may be, for example, a lead storage battery, a lithium ion secondary battery, or the like. The storage battery 25 is connected to the controller 11. The storage battery 25 supplies power to the controller 11.

[0066] The switch 27 is provided on the input side of the converter 13 (the output side of the controller 11, the output side of the connector 23). The switch 27 switches between power supply from the storage battery 25 to the converter 13 and direct power supply from the electric vehicle V to the converter 13 via the connector 23. The switch 27 switches its operation in response to a switching signal output from the controller 11.

[0067] As described above, in power supply system 1A according to this embodiment, switch 27 switches between power supply from storage battery 25 to converter 13 and direct power supply from electric vehicle V to converter 13 via connector 23. This allows electric power to be directly supplied from electric vehicle V to converter 13. Therefore, electric power can be quickly supplied from electric vehicle V to load L. [Explanation of symbols]

[0068] 1,1A...power supply system, 3...power generation unit, 5...charger (charging unit), 7...first storage battery (storage unit, first storage unit), 9...second storage battery (storage unit, second storage unit), 11...controller (control unit), 13...converter (output unit), 19...second switch (switching unit), 116...control unit, 118...output unit, B...storage battery, L...load, V...electric vehicle.

Claims

1. A power generation unit that generates electricity using renewable energy; a power storage unit that is charged by power supplied from the power generation unit; a charging unit to which an electric vehicle is connected and which charges the power storage unit with power supplied from the electric vehicle; an output unit that outputs the power supplied from the power storage unit; a control unit that controls various operations, the power storage unit includes a first power storage unit and a second power storage unit, the first power storage unit is charged by the charging unit, the second power storage unit is charged by power supplied from the power generation unit and also by power supplied from the first power storage unit; an amount of charge / discharge power per unit time of the first power storage unit is greater than an amount of charge / discharge power per unit time of the second power storage unit; The second power storage unit has a larger power storage capacity than the first power storage unit, A power supply system, wherein an amount of power supply per unit time supplied from the charging unit to the power storage unit is greater than an amount of output power per unit time supplied from the power storage unit to the output unit.

2. The power supply system according to claim 1 , wherein the control unit causes the power supplied from the power generation unit to be output to the second power storage unit or the output unit while the charging unit is charging the first power storage unit.

3. The power supply system according to claim 1 , wherein the control unit starts charging the second power storage unit from the first power storage unit when charging of the first power storage unit by the charging unit is completed.

4. a switching unit that switches between power supply from the second power storage unit to the output unit and direct power supply from the electric vehicle to the output unit via the charging unit, 4. The power supply system according to claim 1, wherein the control unit controls a switching operation of the switching unit.

5. 5. The power supply system according to claim 4, wherein, when the electric vehicle is connected to the charging unit after the first power storage unit is fully charged by charging by the charging unit, the control unit controls the switching unit to supply power directly from the electric vehicle to the output unit.

6. 6. The power supply system according to claim 1, wherein, when the second power storage unit is fully charged by power supply from the first power storage unit to the second power storage unit, the control unit causes the charging unit to charge the first power storage unit when the electric vehicle is connected to the charging unit.

7. The control unit When the electric vehicle is connected to the charging unit, calculating a charge amount of the first power storage unit and calculating a planned charge capacity necessary to fully charge the first power storage unit; acquiring a remaining charge of a storage battery of the electric vehicle and calculating a supply capacity that can be supplied from the storage battery; 7. The power supply system according to claim 1, wherein, before starting charging of the first power storage unit, the planned charging capacity and the supplyable capacity are compared, and the smaller of the planned charging capacity and the supplyable capacity is set as the capacity to be charged to the first power storage unit.

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