Power control system and power control method

Abstract

To maintain power supply to a power using apparatus as much as possible when charging / discharging is performed to a stationary storage battery and an on-vehicle storage battery during independent driving.SOLUTION: A power control system includes: an apparatus connection unit to which a power-using apparatus that uses electric power is connected; a storage battery charging / discharging circuit that is connected to a stationary storage battery and can supply power stored in the stationary storage battery to the power-using apparatus; an EV charging / discharging circuit that can supply power stored in an on-vehicle storage battery to the power-using apparatus when connected to the on-vehicle storage battery of an electric vehicle; and a control circuit that controls the storage battery charging / discharging circuit and the EV charging / discharging circuit. The control circuit executes control to perform charging / discharging while prioritizing power supply to a power-using apparatus connected to the apparatus connection unit when performing charging control to discharge from the stationary storage battery to charge the on-vehicle storage battery or charging control to discharge from the on-vehicle storage battery to charge the stationary storage battery during independent driving.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a power control system and a power control method, and more particularly to a power control system that performs charge and discharge between a stationary battery and an in-vehicle battery during autonomous operation.

Background Art

[0002] In a power system connected to a stationary battery and an electric vehicle respectively and capable of charging and discharging each of the stationary battery and the in-vehicle battery, the power system may perform autonomous operation during a power outage. During the autonomous operation of the power system, a scenario is assumed in which an electric vehicle is moved to an area without a power outage to charge the in-vehicle battery and the electric vehicle is connected to the power system to supply the power stored in the in-vehicle battery to the stationary battery. Further, for example, a scenario is assumed in which the power system includes a solar module that performs solar power generation, and the stationary battery is charged with the power generated by solar power generation during the day during autonomous operation, and the in-vehicle battery is charged with the power stored in the stationary battery.

[0003] Regarding the effective use of electricity stored in vehicle batteries during power outages, the following technology is known: a control system comprising a mobile first energy storage device, a control device capable of controlling the discharge of the first energy storage device to electrical equipment in a home, and a server capable of communicating with the control device. The server obtains information about the location of the first energy storage device from other devices and, if it determines that the first energy storage device is located outside the area where the control device is installed, transmits information to the control device prompting it to charge. The first energy storage device is mobile, for example, mounted on a vehicle or bicycle, or carried by a user. When the first energy storage device obtains a predetermined type of weather information from the server, for example, a heavy rain warning or a storm warning, it starts charging to reach full charge. However, if the first energy storage device is not in an area where it can communicate with the control device, such as when the user is out, the control device cannot perform control on the first energy storage device in accordance with the weather information. In that case, the server obtains information about the location of the first energy storage device from other devices and, if it determines that it is located outside the area, transmits information prompting it to charge. The purpose is to ensure that more power is available during a power outage when a mobile vehicle equipped with the first power storage device returns home and the first power storage device is connected to the control system. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2016-226211 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] During autonomous operation, it is expected that power stored in the vehicle's battery will be supplied to a stationary battery to charge it, and conversely, power stored in the stationary battery will be supplied to the vehicle's battery to charge it. In this way, it is desirable to maintain power supply to power-consuming devices connected to the power system even while charging and discharging are being performed on both batteries. This invention was made in consideration of the above circumstances and provides control that maintains power supply to power-consuming devices when charging and discharging occurs between a stationary battery and an on-board battery during independent operation. [Means for solving the problem]

[0006] This invention provides a power control system comprising: an equipment connection section to which power-consuming equipment is connected; a battery charge / discharge circuit connected to a stationary battery capable of supplying power stored in the stationary battery to the power-consuming equipment connected to the equipment connection section; an EV charge / discharge circuit, when connected to an on-board battery of an electric vehicle, capable of supplying power stored in the on-board battery to the power-consuming equipment; and a control circuit that controls the battery charge / discharge circuit and the EV charge / discharge circuit, wherein the control circuit provides a power control system that, when performing charge / discharge control to discharge from the stationary battery and charge the on-board battery or charge / discharge control to discharge from the on-board battery and charge the stationary battery during autonomous operation, controls the charging and discharging to prioritize the supply of power to the power-consuming equipment.

[0007] Furthermore, from a different perspective, this invention provides a power control method comprising: a step of receiving user instructions from a control circuit of a power control system connected to power-consuming equipment, a stationary storage battery, and an on-board storage battery of an electric vehicle; a step of starting a charge / discharge operation based on the instructions, in which the stationary storage battery discharges and the on-board storage battery charges or the on-board storage battery discharges and the stationary storage battery charges; and a step of controlling the charge / discharge operation to prioritize power supply to the power-consuming equipment. [Effects of the Invention]

[0008] In the power control system according to this invention, when the control circuit controls charging and discharging, such as discharging from a stationary battery and charging an on-board battery, or discharging from an on-board battery and charging a stationary battery, during independent operation, it controls the charging and discharging to prioritize the power supply to power-consuming devices connected to the device connection section. Therefore, when charging and discharging between the stationary battery and the on-board battery, the power supply to power-consuming devices can be maintained. The power control method according to this invention also produces similar effects. [Brief explanation of the drawing]

[0009] [Figure 1] This is an explanatory diagram showing an example configuration of a power control system according to Embodiment 1. [Figure 2] Figure 1 is an explanatory diagram showing an example of the operation screen displayed on the remote controller. [Figure 3] Figure 1 is an explanatory diagram showing an example of the V2H operation screen displayed on the remote controller. [Figure 4] Figure 1 shows the first flowchart illustrating the processing steps performed by the PCS control circuit. [Figure 5] Figure 1 shows a second flowchart illustrating the processing steps performed by the PCS control circuit. [Figure 6] This is a third flowchart showing the processing steps performed by the PCS control circuit shown in Figure 1. [Figure 7] Figure 1 shows the fourth flowchart illustrating the processing steps performed by the PCS control circuit. [Modes for carrying out the invention]

[0010] The invention will be described in further detail below with reference to the drawings. The following description is illustrative in all respects and should not be interpreted as limiting the invention. (Embodiment 1) Figure 1 is an explanatory diagram showing an example configuration of a power control system according to Embodiment 1 of the present invention. The power control system 10 shown in Figure 1 is illustrated as an example of a house that receives power from a power grid 15 via a distribution board 15B. The distribution board 15B also serves as a grid connection section connecting the power control system 10 and the power grid 15. The power control system 10 in Figure 1 includes a solar power generation system 11, a stationary battery storage system 12, and a V2H system 13. The solar power generation system 11 generates electricity using sunlight. The stationary battery storage system 12 can store electricity generated by the solar power generation system 11, electricity from the on-board battery 14B of the EV 14, or electricity from the power grid 15 in the stationary battery 12B. Furthermore, the electricity stored in the stationary battery 12B can be supplied to power-using equipment 16 connected to an outlet corresponding to an equipment connection section or to the EV 14 described later, or it can be sold back to the power grid 15. EV14 includes a socket 14S, an on-board battery 14B, and an on-board charge / discharge control circuit 14C. Furthermore, the V2H system 13 is an electric vehicle charge / discharge system that controls the charging and discharging of the on-board battery 14B. As shown in Figure 1, with the EV connected to the V2H system 13, it is possible to supply power from the EV14's on-board battery 14B to a stationary battery system 12 or power-using equipment 16, or to sell the power to the power grid 15. Conversely, the EV14's on-board battery 14B can be charged with power supplied from a solar power generation system 11, a stationary battery system 12, or the power grid 15.

[0011] As shown in Figure 1, the solar power generation system 11 comprises solar modules 11S, a power conditioner 11P (also called a PCS or Power Conditioning System), and a remote controller 11R. The power conditioner 11P comprises a PCS control circuit 11C, a solar power converter 11D, a bidirectional inverter 11V, and a remote controller 11R. The power conditioner 11P and the remote controller 11R are physically separated but connected by communication. The remote controller 11R is also connected by communication to a HEMS controller 17. The HEMS controller 17 communicates with an outdoor HEMS server 17S via a router 17R and a network. The power conditioner 11P is an element that constitutes not only the solar power generation system 11, but also the stationary battery storage system 12 and the V2H system 13.

[0012] The solar module 11S is a power generation device that includes multiple solar cells and generates a DC voltage when it receives sunlight, and flows a DC current through the circuit based on that voltage. The solar power converter 11D of the power conditioner 11P is a circuit that receives instructions from the PCS control circuit 11C and converts the DC voltage generated by the solar module 11S into a predetermined DC voltage. The bidirectional inverter 11V of the power conditioner 11P is a circuit that receives instructions from the PCS control circuit 11C and converts the DC voltage output by the solar power converter 11D into an AC voltage and outputs it to power-using devices 16 connected to outlets or to the power grid 15. Conversely, it is a circuit that converts the AC voltage from the power grid 15 into a DC voltage and outputs it to the battery converter 12D or the EV converter 13D.

[0013] The stationary battery storage system 12 comprises a stationary battery 12B and a battery converter 12D. Furthermore, as described above, it includes a power conditioner 11P and a remote controller 11R. The stationary battery 12B is a rechargeable secondary battery and is connected to the power conditioner 11P via the battery converter 12D. The battery converter 12D receives instructions from the PCS control circuit 11C and charges the stationary battery 12B by converting the DC voltage from the power conditioner 11P to a predetermined DC voltage and outputting it to the stationary battery 12B. Conversely, it also converts the DC voltage from the stationary battery 12B to a predetermined DC voltage and outputs it to the power conditioner 11P. In this way, power from the stationary battery 12B is supplied to power-using devices 16 connected to outlets, the on-board battery 14B of the EV 14 connected to the V2H system 13, or the power grid 15.

[0014] The V2H system 13 includes a connector 13C for EV connection and an EV converter 13D. Connector 13C includes a connector latch 13L. Furthermore, as mentioned above, it includes a power conditioner 11P and a remote controller 11R. The EV converter 13D is an EV charging / discharging circuit that receives instructions from the PCS control circuit 11C and converts the DC voltage from the power conditioner 11P to a predetermined DC voltage. With connector 13C connected to the socket 14S of the EV 14, it supplies power to the on-board battery 14B to charge it. Conversely, it converts the DC voltage output from the on-board battery 14B via socket 14S and connector 13C to a predetermined DC voltage and supplies it to the power conditioner 11P. In this way, the power stored in the on-board battery 14B is supplied to power-using devices 16 connected to outlets, stationary batteries, or the power grid 15. The connector latch 13L can be switched between locked and unlocked states by the PCS control circuit 11C. In the locked state, the connector latch 13L physically secures the connection between the connector 13C and the socket 14S, preventing the connector 13C from coming loose. For the user to remove the connector 13C from the socket 14S, the connector latch 13L must be in the unlocked state.

[0015] The power-consuming equipment 16 is a household electrical appliance such as an air conditioner, cooking appliance, or information equipment, and is a load that consumes electricity. The stationary battery 12B and the on-board battery 14B of the EV14 are also power loads when they are being charged. The power-consuming equipment 16 is supplied with power via the equipment connection section, and as shown in Figure 1, power is supplied from the bidirectional inverter 11V or the grid via the distribution board 15B. When the power-consuming equipment 16 is operating independently, it does not receive power from the grid, so it operates by receiving power from the bidirectional inverter 11V. At this time, as shown in Figure 1, the power-consuming equipment 16 is supplied with power generated by the solar module 11S, the discharge power of the stationary battery 12B, or the discharge power of the on-board battery 14B via the bidirectional inverter 11V and the distribution board 15B. On the other hand, charging of the stationary battery 12B and the on-board battery 14B of the EV14 is performed without going through the distribution board 15B, as shown in Figure 1. The remote controller 11R includes a display device that displays information related to the power controlled by the PCS control circuit 11C, and an operation device that accepts user input.

[0016] The PCS control circuit 11C is a charge / discharge control circuit of the power control system 10, which includes a memory, an input / output circuit, a communication circuit, etc. centered around a processor. The PCS control circuit 11C is communicably connected to the solar power generation converter 11D, the bidirectional inverter 11V, the battery converter 12D, and the EV converter 13D. The PCS control circuit 11C acquires information on whether the EV 14 is connected via the connector 13C and the charging state (such as the charging power value and the remaining capacity) of the in-vehicle battery 14B of the EV 14, and displays it on the display device of the remote controller 11R. Also, regarding the settings related to the charging and discharging of the EV 14, it accepts operations by the user via the remote controller 11R. Furthermore, the PCS control circuit 11C acquires information on the charging state (such as the charging power value and the remaining capacity) of the stationary battery 12B of the stationary battery system 12, and displays it on the display device of the remote controller 11R. Also, regarding the settings related to the charging and discharging of the stationary battery 12B, it accepts operations by the user via the remote controller 11R. Furthermore, the PCS control circuit 11C acquires information on the charging state (such as the charging power value and the remaining capacity) of the stationary battery 12B of the stationary battery system 12, and displays it on the display device of the remote controller 11R. Also, regarding the settings related to the charging and discharging of the stationary battery 12B, it accepts operations by the user via the remote controller 11R.

[0017] When charging the EV 14, the user connects the connector 13C to the socket 14S provided on the EV 14. By doing so, a power line is connected between the EV converter 13D of the V2H system 13 and the in-vehicle battery 14B, and a communication line is connected between the EV converter 13D and the in-vehicle charge / discharge control circuit 14C. Then, the processor of the PCS control circuit 11C and the in-vehicle charge / discharge control circuit 14C become in a communicable state, and it becomes possible to supply power to the in-vehicle battery 14B while exchanging information with the EV 14. The in-vehicle charge / discharge control circuit 14C includes a memory, an input / output circuit, a communication circuit, etc. centered around a processor, and controls communication with the V2H system 13 and the charging and discharging of the in-vehicle battery 14B.

[0018] The PCS control circuit 11C causes the remote controller 11R to display the charge and discharge amounts of the in-vehicle battery 14B of the EV 14 connected to the connector 13C and the charge and discharge amounts of the stationary battery 12B. In addition, it may display information related to the power control of the power control system 10 executed by the power conditioner 11P. For example, information such as the power consumption based on the voltage value and current value related to the power transmitted and received with the power grid 15, detected by a smart meter (not shown) in FIG. 1, may be displayed. Also, it may display the power and power amount that the power control system 10 purchases from the power grid 15 and sells to the power grid 15. Furthermore, it may display the power generation amount and power generation power of the solar power module 11S, the energy amount stored in the stationary battery 12B and the in-vehicle battery 14B, the charge rate (SOC), the charge and discharge amounts or the charge and discharge powers.

[0019] The HEMS controller 17 communicates with the solar power generation system 11, the stationary battery system 12, and the V2H system 13, and performs the power control of the power control system 10. Specifically, the HEMS controller 17 communicates with the remote controller 11R of the power conditioner 11P. Also, the HEMS controller 17 communicates with an information device 17D such as the user's smartphone, provides information related to power control, and receives the user's settings related to power control. Note that the remote controller 11R may兼 have the functions of the above-mentioned information device 17D, communicate with the HEMS controller 17, provide the above-mentioned information related to power control, and receive the user's settings related to power control. Conversely, there may be a mode in which the above-mentioned portable information device兼 has the functions of the remote controller 11R. In the example shown in FIG. 1, the battery converter 12D and the EV converter 13D are separate devices from the power conditioner 11P, but some or all of them may be included in the power conditioner 11P.

[0020] ≪Operation of V2H System≫ In the power control system 10 shown in Figure 1, an example of the procedure for a user to operate the V2H system 13 to instruct the charging and discharging of the on-board battery 14B of the EV 14 is described below. Figure 2 is an explanatory diagram showing an example of an operation screen displayed on the display device of the remote controller 11R shown in Figure 1. The operation screen shown in Figure 2 is an example of a top screen that provides comprehensive information of the power control system 10. The PCS control circuit 11C causes the remote controller 11R to display the top screen 20 as shown in Figure 2. From the left end to the right end of the top screen 20, the solar power generation information display area 21, the V2H information display area 22, the stationary battery information display area 23, and the power consumption / sales power display area 24 are arranged in order, as shown by the dashed line frames.

[0021] The solar power generation information display area 21 provides information such as the power generated by the solar power generation system 11. The V2H information display area 22 provides information such as the charge and discharge status of the on-board battery 14B. The stationary battery information display area 23 provides information such as the charge and discharge status of the stationary battery 12B. The power consumption / sale power display area 24 provides information about the power consumption of the power control system 10, the status of selling or buying electricity, and information related to that electricity. A [V2H operation] button 25 is located in the V2H information display area 22. When the user touches the [V2H operation] button 25, the PCS control circuit 11C responds to that operation by switching the top screen 20 to the V2H operation screen 30 shown in Figure 3.

[0022] The V2H operation screen 30 includes a [Manual Charge] button 31, an [Automatic Operation] button 32, a [Charge from Stationary Battery] button 33, a [Discharge to Stationary Battery] button 34, an [EV Disconnect] button 35, and a [Back] button 36. When the [EV Connect] button is touched, the connector latch 13L is locked, and the connector is connected to the EV. When the [EV Disconnect] button is touched, the connector latch 13L is unlocked, and the connection between the connector and the EV is disconnected. The operating mode of the V2H system 13 is also displayed in the V2H mode information 37. The PCS control circuit 11C selectively displays the [Manual Charge] button 31 and the two buttons [Charge from Stationary Battery] 33 and [Discharge to Stationary Battery] 34. During grid-connected operation, when the power grid 15 is able to send and receive power with the power control system 10, the [Manual Charge] button 31 is displayed, but the [Charge from Stationary Battery] button 33 and the [Discharge to Stationary Battery] button 34 are not displayed. On the other hand, during standalone operation, when the power control system 10 is isolated from the power grid 15 due to a power outage in the power grid 15, the [Charge from Stationary Battery] button 33, the [Discharge to Stationary Battery] button 34, and the [Manual Charge] button 31 are displayed.

[0023] When connector 13C is connected to socket 14S of EV14, if the user touches the [Manual Charge] button 31, the PCS control circuit 11C responds to that operation and starts the charging process to the on-board battery. Also, if the [Automatic Driving] button 32 is touched, the PCS control circuit 11C responds to that operation and starts the charging and discharging process to the on-board battery in the mode set on the operation screen. If the [Charge from Stationary Battery] button 33 is touched, the PCS control circuit 11C responds to that operation and starts the charging process from the stationary battery 12B to the on-board battery 14B. On the other hand, if the [Discharge to Stationary Battery] button 34 is touched, the PCS control circuit 11C responds to that operation and starts the discharging process from the on-board battery 14B to the stationary battery 12B. The PCS control circuit 11C selectively displays the [Manual Charge] button 31 and the two buttons [Charge from Stationary Battery] button 33 and [Discharge to Stationary Battery] button 34. When the power control system 10 is operating in grid-connected mode, the [Manual Charge] button 31 is displayed, but the [Charge from Stationary Battery] button 33 and the [Discharge to Stationary Battery] button 34 are not displayed. On the other hand, when the power control system 10 is operating independently, the [Charge from Stationary Battery] button 33 and the [Discharge to Stationary Battery] button 34 are displayed, but the [Manual Charge] button 31 is not displayed.

[0024] The [Charge from Stationary Battery] button 33 and the [Discharge to Stationary Battery] button 34 are intended to be operated when the power grid 15 is experiencing a power outage and the power control system 10 is operating independently. Specifically, the [Charge from Stationary Battery] button 33 is intended for use when electricity generated by the solar power generation system 11 during the daytime while the system is operating independently is stored in the stationary battery 12B, and that electricity is then supplied to the EV 14. The [Discharge to Stationary Battery] button 34 is intended for use when the EV 14 is moved to an area without a power outage to charge the on-board battery 14B, or before moving the EV 14, and the electricity stored in the on-board battery 14B is connected to the V2H system 13 to supply the electricity stored in the on-board battery 14B to the stationary battery 12B. Therefore, the [Charge from Stationary Battery] button 33 and the [Discharge to Stationary Battery] button 34 are effective when the power grid 15 is experiencing a power outage and the power control system 10 is operating independently.

[0025] When the [Charge from stationary battery] button 33 is touched while the power control system 10 is operating independently, the PCS control circuit 11C controls the battery converter 12D and the EV converter 13D to charge the on-board battery 14B with the power stored in the stationary battery 12B. Also, when the [Discharge to stationary battery] button 34 is touched while operating independently, the PCS control circuit 11C controls the battery converter 12D and the EV converter 13D to charge the stationary battery 12B with the power stored in the on-board battery 14B. However, in either case, if there is a power-consuming device 16 using power, priority is given to supplying power to that power-consuming device 16. That is, when the PCS control circuit 11C charges the on-board battery 14B with the power stored in the stationary battery 12B, it controls the bidirectional inverter 11V, the battery converter 12D, and the EV converter 13D as follows. Prioritizing the supply of power to the power-consuming equipment 16, if there is sufficient power supply capacity in the stationary battery 12B, that capacity will be used to supply power to the on-board battery 14B for charging. Furthermore, when charging the stationary battery 12B with the power stored in the on-board battery 14B, the bidirectional inverter 11V, the battery converter 12D, and the EV converter 13D will be controlled as follows: that is, prioritizing the supply of power to the power-consuming equipment 16, if there is sufficient power supply capacity in the on-board battery 14B, that capacity will be used to supply power to the stationary battery 12B for charging. By controlling it in this way, power supply to power-consuming equipment is maintained when charging and discharging between the stationary battery and the on-board battery during autonomous operation.

[0026] Thus, during independent operation when the power control system 10 is isolated from the power grid 15 due to a power outage in the power grid 15, the system displays the [Charge from stationary battery] button 33 and the [Discharge to stationary battery] button 34 to inform the user that it is possible to receive instructions to discharge from the stationary battery 12B and charge the vehicle battery 14B, or to discharge from the vehicle battery 14B and charge the stationary battery 12B. Furthermore, when the [Charge from stationary battery] button 33 is touched during independent operation, the system receives instructions from the user to discharge from the stationary battery 12B and charge the vehicle battery 14B, and when the [Discharge to stationary battery] button 34 is touched, the system receives instructions from the user to discharge from the vehicle battery 14B and charge the stationary battery 12B. The PCS control circuit 11C then controls the battery converter 12D and the EV converter 13D to discharge power stored in the stationary battery 12B to charge the on-board battery 14B, or to discharge power stored in the on-board battery 14B to charge the stationary battery 12B. However, the user's instruction is either to discharge from the stationary battery 12B and charge the on-board battery 14B, or to discharge from the on-board battery 14B and charge the stationary battery 12B. In either case, if there is a power-consuming device 16 using power, supplying power to that device 16 takes priority over charging. In other words, the PCS control circuit 11C supplies power used by the power-consuming equipment 16 from the on-board battery 14B or stationary battery 12B, which is the discharge side, and if there is surplus power supply capacity on the discharge side, it supplies power to the stationary battery 12B or on-board battery 14B that is to be charged and performs charging.

[0027] Here, in the case of an instruction to discharge from the stationary battery 12B and charge the on-board battery 14B, the discharge side is the stationary battery 12B, and the battery to be charged is the on-board battery 14B. Similarly, in the case of an instruction to discharge from the on-board battery 14B and charge the stationary battery 12B, the discharge side is the on-board battery 14B, and the battery to be charged is the stationary battery 12B. In this way, by prioritizing the supply of power to the power-consuming equipment 16 over charging, it becomes possible to maintain the power supply to the power-consuming equipment 16. If, however, the user issues an instruction to discharge from the stationary battery 12B and charge the on-board battery 14B, or to discharge from the on-board battery 14B and charge the stationary battery 12B, and such charging and discharging is prioritized, there is a risk that the power supply to the power-consuming equipment 16 will be lost. In this embodiment, even if the user's instruction is either to discharge from the stationary battery 12B and charge the on-board battery 14B, or to discharge from the on-board battery 14B and charge the stationary battery 12B, it is possible to maintain power supply to the power-consuming device 16 by prioritizing power supply to the power-consuming device 16 over charging.

[0028] (Embodiment 2) Embodiment 1 describes the case where the power source supplying power during the independent operation of the power control system 10 is a stationary battery 12B or an on-board battery 14B. For example, the period from sunset to sunrise when no solar power generation is performed corresponds to Embodiment 1. Embodiment 1 also corresponds to the case where the power control system 10 does not have a solar module 11S. This embodiment describes the case where solar power generation by the solar module 11S is also a power source. Note that the same control is applicable not only to solar power generation but also when the power control system 10 has a self-generation system. During the daytime when solar power generation by the solar module 11S is performed, the PCS control circuit 11C controls the solar power converter 11D, the bidirectional inverter 11V, the battery converter 12D, and the EV converter 13D as follows: That is, if there is a power-consuming device 16 using power, the power generated by solar power generation is supplied to that power-consuming device 16 as a priority. For example, when the vehicle battery 14B is being charged with electricity stored in the stationary battery 12B, and there is a surplus of electricity generated by solar power, the surplus electricity is supplied to the vehicle battery 14B for charging. That is, electricity generated by solar power is supplied to the power-consuming equipment 16 and the vehicle battery 14B, and electricity is also supplied from the discharging side (stationary battery 12B) to the vehicle battery 14B.

[0029] If there is a surplus of electricity generated by solar power, that surplus electricity is supplied to the stationary battery 12B for charging. In other words, electricity generated by solar power is supplied to the power-using equipment 16, the on-board battery 14B, and the stationary battery 12B. Since the on-board battery 14B, which is the charging side, is charged with electricity generated by solar power, the stationary battery 12B, which is the discharging side, does not need to supply power to the on-board battery 14B. However, if the electricity generated by solar power that charges the on-board battery 14B does not reach the rated charging power of the on-board battery 14B, the stationary battery 12B, which is the discharging side, may further supply power to the on-board battery 14B. When the stationary battery 12B is being charged with power stored in the vehicle battery 14B, the charging and discharging sides are reversed compared to the example described above, but the control is the same in that power generated by solar power is supplied preferentially to the power-using equipment 16, any surplus power is supplied to the charging side, and any further surplus power is supplied to the discharging side. Also, the control is the same in that surplus power is supplied to the charging side, and if the rated power of the charging side has not been reached, additional power is supplied from the discharging side as well.

[0030] In this embodiment, when the [Charge from stationary battery] button 33 is touched during independent operation, the system receives an instruction from the user to discharge from the stationary battery 12B and charge the on-board battery 14B. When the [Discharge to stationary battery] button 34 is touched, the system receives an instruction from the user to discharge from the on-board battery 14B and charge the stationary battery 12B. The PCS control circuit 11C then controls the battery converter 12D and the EV converter 13D to discharge the power stored in the stationary battery 12B to charge the on-board battery 14B, or to discharge the power stored in the on-board battery 14B to charge the stationary battery 12B. However, priority is given to using power generated by solar power generation over this charging and discharging. In other words, the PCS control circuit 11C supplies power used by the power-consuming equipment 16 from solar power generation, and if there is surplus power, it supplies power to the stationary battery 12B or vehicle battery 14B that is to be charged and charges it, and if there is still surplus power, it also charges the vehicle battery 14B or stationary battery 12B that is on the discharge side. Furthermore, the PCS control circuit 11C supplies power used by the power-consuming equipment 16 from solar power generation, and if there is surplus power, it supplies power to the stationary battery 12B or vehicle battery 14B that is to be charged and charges it, and further charges the vehicle battery 14B or stationary battery 12B that is on the discharge side and charges the stationary battery 12B or vehicle battery 14B that is to be charged. Here, in the case of an instruction to discharge from the stationary battery 12B and charge the vehicle battery 14B, the discharge side is the stationary battery 12B and the battery to be charged is the vehicle battery 14B. Similarly, in the case of an instruction to discharge from the on-board battery 14B and charge the stationary battery 12B, the discharging side is the on-board battery 14B, and the battery to be charged is the stationary battery 12B. In this way, by prioritizing the use of electricity generated by solar power generation, power supply to power-using equipment 16 can be maintained, and furthermore, charging can be performed on the stationary battery 12B or the on-board battery 14B that is to be charged while suppressing the decrease in the power stored in the on-board battery 14B or the stationary battery 12B that is to be discharged.

[0031] (Embodiment 3) Embodiment 2 describes a case where the power generated by solar power generation can supply the power used by the power-consuming equipment 16. This embodiment describes a case where the power generated by solar power generation alone is not enough to supply the power used by the power-consuming equipment 16. For example, when the on-board battery 14B is being charged with power stored in the stationary battery 12B, there may be a situation where the power supplied to the power-consuming equipment 16 is insufficient with only the power generated by solar power generation. In that case, the PCS control circuit 11C controls the solar power converter 11D, the bidirectional inverter 11V, the battery converter 12D, and the EV converter 13D to supply the insufficient power from the discharging stationary battery 12B to the power-consuming equipment 16.

[0032] If the stationary battery 12B on the discharge side has sufficient power supply capacity, the PCS control circuit 11C uses that surplus power to charge the on-board battery 14B on the charging side. If the stationary battery 12B is being charged with power stored in the on-board battery 14B, the charging and discharging sides are reversed compared to the example described above. In that case as well, the system prioritizes supplying power from the discharge side to the power-using equipment 16 to compensate for any power shortage from solar power generation alone, and if there is sufficient power supply capacity on the discharge side, it controls the system to supply that surplus power to the charging side to perform charging.

[0033] In this embodiment, when the [Charge from stationary battery] button 33 is touched during independent operation, the system receives an instruction from the user to discharge from the stationary battery 12B and charge the on-board battery 14B. When the [Discharge to stationary battery] button 34 is touched, the system receives an instruction from the user to discharge from the on-board battery 14B and charge the stationary battery 12B. The PCS control circuit 11C then controls the battery converter 12D and the EV converter 13D to discharge the power stored in the stationary battery 12B to charge the on-board battery 14B, or to discharge the power stored in the on-board battery 14B to charge the stationary battery 12B. However, priority is given to using power generated by solar power generation over this charging and discharging. In other words, the PCS control circuit 11C supplies power to the power-using equipment 16 from solar power generation. If the power generated by solar power generation is insufficient to power the power-using equipment 16, it also supplies power to the power-using equipment 16 from the discharge side, which is either the on-board battery 14B or the stationary battery 12B. Furthermore, if there is surplus power supply capacity on the discharge side, it supplies power to the stationary battery 12B or the on-board battery 14B that is to be charged, and charges it. Here, in the case of an instruction to discharge from the stationary battery 12B and charge the on-board battery 14B, the discharge side is the stationary battery 12B, and the battery to be charged is the on-board battery 14B. Similarly, in the case of an instruction to discharge from the on-board battery 14B and charge the stationary battery 12B, the discharge side is the on-board battery 14B, and the battery to be charged is the stationary battery 12B. In this way, by prioritizing the use of electricity generated by solar power, the power supply to the power-consuming equipment 16 can be maintained, and furthermore, the stationary battery 12B or the vehicle battery 14B that is to be charged can be charged while suppressing the decrease in the power stored in the vehicle battery 14B or the stationary battery 12B that is on the discharge side.

[0034] In some cases, the electricity generated by solar power generation alone may not be sufficient to power the power-using equipment 16, and even supplying power stored on the discharge side may not be enough to power the power-using equipment 16. In such cases, the PCS control circuit 11C provides the user with information that there is a power shortage. Specifically, it displays on the remote controller 11R that there is insufficient power to power the power-using equipment 16 and that the power supply from the V2H system 13 has been stopped. Alternatively, the HEMS controller 17 may also display on the user's information device 17D that there is a power shortage and the power supply from the V2H system 13 has been stopped.

[0035] Flowchart The processes executed by the PCS control circuit 11C in Embodiments 1 to 3 will be explained with reference to the flowcharts. Figures 4 to 7 are flowcharts showing the procedures of the processes executed by the PCS control circuit 11C shown in Figure 1. Figure 4 mainly shows the process flow when the [V2H operation] button 25 on the top screen 20 is touched during independent operation to display the V2H operation screen 30, and the [Charge from stationary battery] button 33 or the [Discharge to stationary battery] button is touched on the V2H operation screen 30. As shown in Figure 4, when the [V2H operation] button 25 on the top screen 20 displayed on the remote controller 11R is touched (Yes in step S11), the PCS control circuit 11C determines whether or not independent operation is in progress (step S13). If it is not in independent operation, i.e., if it is in grid-connected operation (No in step S13), the PCS control circuit 11C displays the V2H operation screen 30 corresponding to grid-connected operation on the remote controller 11R. The [Manual Charging] button 31, [Automatic Driving] button 32, [EV Disconnection] button 35, and [Back] button 36 are enabled on this screen. If an instruction is received on the V2H operation screen 30, processing is performed according to the received instruction (step S15). Then, the process returns to step S13 as described above, and the judgment on the V2H operation screen is repeated. Here, we are focusing on the processing during autonomous driving, so the details are omitted.

[0036] If the power control system 10 is operating autonomously as determined in step S13 (Yes in step S13), the PCS control circuit 11C displays the V2H operation screen for autonomous operation on the remote controller 11R. The screen has the following active buttons: [Manual Charge] button 31, [Automatic Operation] button 32, [Charge from Stationary Battery] button 33, [Discharge to Stationary Battery] button 34, [Disconnect EV] button 35, and [Back] button 36. Then, it is determined whether the [Charge from Stationary Battery] button 33 has been touched (step S19). If it is determined that the [Charge from Stationary Battery] button 33 has been touched (Yes in step S19), the PCS control circuit 11C sets the discharge side to the stationary battery 12B and the charging side to the on-board battery 14B (step S21), and then executes a subroutine related to direct charging processing (step S23). Then, the process returns to step S13, and the determination on the V2H operation screen is repeated. The details of the processing related to the subroutine for direct charging will be described later with reference to Figure 5 and subsequent figures. In Figures 4 to 7, direct charging refers to charging processes that discharge from the stationary battery 12B and charge the on-board battery 14B, or charging processes that discharge from the on-board battery 14B and charge the stationary battery 12B.

[0037] If the determination in step S19 above determines that the [Charge from stationary battery] button 33 has not been touched (No in step S19), the PCS control circuit 11C then determines whether the [Discharge to stationary battery] button 34 has been touched (step S25). If the determination that the [Discharge to stationary battery] button 34 has been touched (Yes in step S25), the PCS control circuit 11C sets the discharge side to the on-board battery 14B and the charging side to the stationary battery 12B (step S27), and then executes a subroutine related to direct charging processing (step S23). Then, the process returns to step S13 above, and the determination on the V2H operation screen is repeated.

[0038] If the determination in step S25 above determines that the [Discharge to Stationary Battery] button 34 has not been touched (No in step S25), the PCS control circuit 11C then determines whether the [Back] button 36 has been touched (step S29). If it determines that the [Back] button 36 has been touched (Yes in step S29), the PCS control circuit 11C switches the screen displayed on the remote controller 11R from the V2H operation screen 30 to the top screen 20. Then, the process returns to step S11 above and the determination of whether the [V2H Operation] button 25 on the top screen 20 has been touched is repeated.

[0039] If the determination in step S29 indicates that the [Back] button 36 has not been touched (No in step S29), the PCS control circuit 11C then determines whether any other button on the V2H operation screen 30 has been touched (step S33). If any other button has been touched (Yes in step S33), the system performs the processing corresponding to the touched button (step S35). The process then returns to step S13, and the determination on the V2H operation screen is repeated. Here, we are focusing on the processing when the [Charge from stationary battery] button 33 and the [Discharge to stationary battery] button 34 are touched, so the details are omitted.

[0040] Next, we will discuss the direct charging process in step S23. Figures 5 to 7 are flowcharts detailing the direct charging process. As shown in Figure 5, when the direct charging process subroutine is called, the PCS control circuit 11C determines whether or not power generation is being performed by the solar power generation system 11 (step S41 in Figure 5). If power is not being generated by solar power generation (No in step S41), it determines whether or not there is a power-consuming device 16 to which power should be supplied (step S61). That is, it determines whether or not there is a power-consuming device 16 in operation. If there is a power-consuming device 16 in operation (Yes in step S61), the PCS control circuit 11C supplies power from the discharge side to the power-consuming device 16 (step S63). Next, it causes the remote controller 11R to display that discharge is being performed from the discharge side to the power-consuming device 16 (step S64). Then, the process proceeds to the next step S65. On the other hand, if there is no power-consuming device 16 in operation (No in step S61), the PCS control circuit 11C proceeds to step S65 without supplying power from the discharge side to the power-consuming device 16.

[0041] In step S65, the PCS control circuit 11C determines whether there is sufficient power supply capacity on the discharge side. If there is no sufficient power supply capacity on the discharge side (No in step S65), the PCS control circuit 11C determines whether there is insufficient power to supply to the power-using device 16 (step S91 shown in Figure 7). If it is determined that there is insufficient power to supply to the power-using device 16 (Yes in step S91), the remote controller 11R is instructed to display a message indicating that there is insufficient power to supply to the power-using device 16 (step S91). Furthermore, a notification to the user's information device 17D may be sent via the HEMS controller 17 or the like. Then, power supply from the discharge side to the charging side is stopped (step S95), and the direct charging process subroutine is terminated.

[0042] If the determination in step S65 indicates that there is sufficient power supply capacity on the discharge side (Yes in step S65), the PCS control circuit 11C controls the charging side to charge by supplying power from the discharge side. In other words, even while direct charging is in progress, power supply to the power-using device 16 is prioritized over power supply to the charging side. First, power from the discharge side is supplied to the charging side to perform charging (step S69). Then, the remote controller 11R is shown that charging and discharging is in progress from the discharge side to the charging side (step S67). While charging is in progress, the PCS control circuit 11C determines whether or not it is time to terminate charging to the charging side (step S71). Situations in which charging should be terminated include, for example, when the charging side is fully charged or when the discharge side can no longer discharge. However, it is not limited to these cases; for example, there may be cases where there is no power available to supply to the charging side due to fluctuations in power from solar power generation or fluctuations in the power that should be supplied to the power-using device 16. Furthermore, the connection between connector 13C of the V2H system 13 and EV14 may also be lost.

[0043] If it is determined that charging should be terminated (Yes in step S71), the PCS control circuit 11C stops supplying power to the charging side and displays a message on the remote controller 11R indicating that charging has finished (step S73). For example, a message indicating that charging has finished may be displayed for a predetermined period, or the user may be notified that charging has finished by the state of an icon or button. Then, the direct charge / discharge processing subroutine is terminated. On the other hand, if it is determined in step S71 that charging should be continued (No in step S71), the PCS control circuit 11C returns to step S41. Then, after determining the presence and amount of power from solar power generation and power used by the power-consuming equipment 16, it continues the process of supplying power to the power-consuming equipment 16 and the charging side according to the situation.

[0044] The above explanation assumes that, as determined in step S41, no electricity is being generated by solar power. On the other hand, if electricity is being generated by solar power (Yes in step S41), the PCS control circuit 11C performs the following processing. First, it determines whether or not there is a power-consuming device 16 to which power should be supplied (step S43). That is, it determines whether or not there is a power-consuming device 16 in operation. If there is no power-consuming device 16 in operation (No in step S43), the PCS control circuit 11C proceeds to step S49, which will be described later. On the other hand, if there is a power-consuming device 16 in operation, the PCS control circuit 11C supplies electricity generated by solar power to the power-consuming device 16 (step S45). Then, it determines whether or not there is a surplus of electricity generated by solar power even after supplying power to the power-consuming device 16 (step S47). If there is a surplus of electricity (Yes in step S47), the PCS control circuit 11C supplies that surplus electricity to the charging side to perform charging. In other words, even while direct charging is in progress, the power supply to the power-using device 16 is prioritized over the power supply to the charging side. First, the system is controlled to supply surplus power from solar power generation to the charging side to perform charging (step S49). Then, the remote controller 11R is shown an indication that charging is in progress using surplus power from solar power generation (step S51).

[0045] Furthermore, the PCS control circuit 11C determines whether there is a surplus of power generated by solar power even after supplying power to the charging side (step S53). If there is a surplus of power (Yes in step S53), the PCS control circuit 11C supplies that surplus power to the discharge side and charges the discharge side as well (step S55). Next, the remote controller 11R is shown that charging is in progress using the surplus power generated by solar power (step S56). Since both the charging side and the discharge side are charged with power generated by solar power, in this state the discharge side does not discharge to the charging side or to the power-using equipment 16. While charging, the PCS control circuit 11C determines whether it is time to terminate charging to the charging side (step S71). Subsequent processing is as described above.

[0046] If, in the determination in step S53 described above, it is determined that power can be supplied to the charging side but there is not enough capacity to supply power to the discharging side (No in step S53), the PCS control circuit 11C determines whether it is possible to accept charging with power from the discharging side in addition to the power generated by solar power (step S57). If it is possible to accept charging with power from the discharging side in addition to the power generated by solar power (Yes in step S57), the PCS control circuit 11C supplies power from the discharging side to the charging side and performs charging (step S69 shown in Figure 5). While charging, the PCS control circuit 11C determines whether it is time to terminate charging to the charging side (step S71). On the other hand, if the charging side does not have the capacity to accept power other than that generated by solar power (No in step S57), the PCS control circuit 11C determines whether it is time to terminate charging to the charging side without supplying power from the discharging side to the charging side (step S71 shown in Figure 5). Subsequent processing is as described above.

[0047] If the determination in step S47 indicates that there is no surplus power generated by solar power generation (No in step S47), the PCS control circuit 11C determines whether the power generated by solar power alone is insufficient to supply power to the power-consuming equipment 16 (step S81 shown in Figure 6). If it determines that there is a power shortage (Yes in step S83), the PCS control circuit 11C supplies the insufficient power to the power-consuming equipment 16 from the discharge side (step S83). Then, it displays on the remote controller 11R that it is discharging power from the discharge side to the power-consuming equipment 16 (step S85). The process then proceeds to the determination in step S65 in Figure 5. On the other hand, if the determination in step S83 indicates that there is no power shortage to supply power to the power-consuming equipment 16 (No in step S81), the PCS control circuit 11C proceeds to the determination in step S65 in Figure 5 without supplying power from the discharge side.

[0048] As stated above, (i) The power control system according to this invention comprises: an equipment connection section to which power-consuming equipment is connected; a battery charge / discharge circuit connected to a stationary battery and capable of supplying power stored in the stationary battery to the power-consuming equipment connected to the equipment connection section; an EV charge / discharge circuit connected to an on-board battery of an electric vehicle and capable of supplying power stored in the on-board battery to the power-consuming equipment; and a control circuit that controls the battery charge / discharge circuit and the EV charge / discharge circuit, wherein the control circuit controls the charging and discharging to prioritize the supply of power to the power-consuming equipment when performing charge / discharge control to discharge from the stationary battery and charge the on-board battery or charge / discharge control to discharge from the on-board battery and charge the stationary battery during autonomous operation.

[0049] In this invention, the power-consuming equipment is, for example, equipment such as air conditioners, cooking equipment, or information equipment, which is a load that consumes electricity. Furthermore, the EV charging / discharging circuit is a circuit for charging and discharging the on-board battery. The EV converter in the aforementioned embodiment corresponds to the EV charging / discharging circuit of this invention. Furthermore, the charge / discharge control circuit is a circuit that controls the charge / discharge circuit for EVs. The PCS control circuit in the above-described embodiment corresponds to the charge / discharge control circuit of this invention. During independent operation, when charging and discharging by discharging from a stationary battery to a vehicle-mounted battery, or discharging from a vehicle-mounted battery to a stationary battery, the power supply to power-consuming devices can be maintained by prioritizing power supply to these devices over the charging and discharging process.

[0050] Furthermore, preferred embodiments of this invention will be described. (ii) The system further comprises a solar power circuit connected to a solar module to supply electricity generated by solar power, wherein the control circuit controls the power used by the power-using equipment to be supplied by the electricity generated by solar power, and controls the system to supply the surplus power to the stationary battery or the vehicle battery which is to be charged when there is a surplus of electricity generated by solar power. According to this embodiment, the power used by power-consuming equipment can be supplied by solar power generation, and if there is a surplus, that surplus power can be used to charge a stationary battery or an on-board battery that is to be charged. Furthermore, the system may be controlled to supply power from the on-board battery or stationary battery, which is the discharge side, to the stationary battery or on-board battery that is to be charged, thereby performing the charging. According to this embodiment, the power used by power-consuming equipment is supplied by solar power generation, and if there is a surplus, that surplus power is used to charge a stationary battery or an on-board battery that is to be charged. If the charging power of the stationary battery or on-board battery that is to be charged has not yet reached its rated capacity, the charging can be increased by discharging from the battery on the discharging side.

[0051] (iii) The control circuit may use the power generated by the solar power generation to supply (1) power used by the power-using equipment, and (2) power to the stationary battery or the vehicle battery to be charged, and if there is surplus power, it may also charge the vehicle battery or the stationary battery, which is the discharge side. According to this embodiment, the power used by power-consuming equipment and the power to charge the stationary or on-board battery to be charged can be supplied by solar power generation, and if there is a surplus, that surplus power can be used to charge the on-board or stationary battery on the discharge side. In other words, the power used by power-consuming equipment, the stationary battery and the on-board battery can be charged using solar power generation. Power can be supplied to power-consuming equipment, and the power stored in the on-board or stationary battery on the discharge side can be maintained while charging the stationary or on-board battery to be charged.

[0052] (iv) The system further comprises a power circuit for solar power generation that is connected to a solar module and supplies power generated by solar power generation, and the control circuit may be controlled to supply power to the power-using equipment from the stationary battery or the vehicle battery on the discharge side if the power generated by solar power generation is insufficient for the power used by the power-using equipment. According to this embodiment, if the power supplied by solar power generation alone is insufficient to meet the needs of power-using equipment, the insufficient power can be supplied from the discharging vehicle battery or stationary battery that is used to charge the stationary battery or vehicle battery.

[0053] (v) The control circuit may supply power from the discharge side to the power used by the power-consuming equipment that is insufficient from the power generated by the solar power generation, and if there is surplus power supply capacity on the discharge side, it may supply power to the stationary storage battery or the vehicle storage battery to be charged and perform charging. According to this embodiment, if the power supply used by power-consuming equipment is insufficient with only solar power generation, and the deficit is supplied from the vehicle-mounted battery or stationary battery on the discharge side, the stationary battery or vehicle-mounted battery can be charged with any surplus power supply capacity on the discharge side. This allows for charging of the stationary battery or vehicle-mounted battery while maintaining the power supply to power-consuming equipment and suppressing the decrease in power stored in the vehicle-mounted battery or stationary battery on the discharge side.

[0054] (vi) The control circuit may provide the user with information indicating a power shortage if the power supplied to the power-using equipment is insufficient from the solar power generation and the stationary storage battery or vehicle storage battery on the discharge side. According to this embodiment, when the power supply used by power-consuming equipment is insufficient from solar power generation and power from the on-board battery or stationary battery on the discharge side, the user can be notified of the power shortage.

[0055] (vii) One aspect of the present invention includes a power control method comprising: a step of receiving a user instruction from a control circuit of a power control system connected to a power-consuming device, a stationary battery, and an on-board battery of an electric vehicle; a step of starting a charge-discharge operation based on the instruction, in which the stationary battery discharges and the on-board battery charges or the on-board battery discharges and the stationary battery charges; and a step of controlling the charge-discharge operation to prioritize the supply of power to the power-consuming device while performing the charge-discharge operation. During independent operation, when charging and discharging by discharging from a stationary battery to a vehicle-mounted battery, or discharging from a vehicle-mounted battery to a stationary battery, the power supply to power-consuming devices can be maintained by prioritizing power supply to these devices over the charging and discharging process.

[0056] The embodiments of this invention also include combinations of any of the embodiments described above. In addition to the embodiments described above, various modifications of this invention are possible. These modifications should not be considered outside the scope of this invention. This invention should encompass the meaning of the claims and equivalents, as well as all of the aforementioned modifications. [Explanation of Symbols]

[0057] 10: Power control system, 11: Solar power generation system, 11P: Power conditioner, 11C: PCS control circuit, 11D: Solar power converter, 11R: Remote controller, 11S: Solar module, 11V: Bidirectional inverter, 12: Stationary battery storage system, 12B: Stationary battery, 12D: Battery converter, 13: V2H system, 13C: Connector, 13D: EV converter, 13L: Connector latch, 14: EV, 14B: On-board battery, 14C: On-board charge / discharge control circuit, 14S: Socket, 15: Power grid, 15B: Distribution board, 16: Power-consuming equipment, 17: HEMS controller, 17D: Information equipment, 17R: Router, 17S: HEMS server, 20: Top screen, 21: Solar power generation information display area, 22: V2H information display area, 23: Stationary battery information display area, 24: Power consumption / sales power display area, 25: [V2H operation] button, 30: V2H operation screen, 31: [Manual charging] button, 32: [Automatic operation] button, 33: [Charge from stationary battery] button, 34: [Discharge to stationary battery] button, 35: [Disconnect EV] button, 36: [Back] button, 37: V2H mode information

Claims

1. The equipment connection section to which power-consuming equipment is connected, A battery charging and discharging circuit connected to a stationary battery, which can supply power stored in the stationary battery to the power-consuming equipment connected to the equipment connection section, An EV charging and discharging circuit that, when connected to the on-board battery of an electric vehicle, can supply power stored in the on-board battery to the aforementioned power-consuming equipment, The system comprises a charging and discharging circuit for a storage battery and a control circuit for controlling the charging and discharging circuit for an electric vehicle, The control circuit receives instructions from the user to discharge from the stationary battery and charge the on-board battery during independent operation, or instructions from the user to discharge from the on-board battery and charge the stationary battery, and starts charging and discharging based on those instructions. It controls the charging and discharging to be performed while prioritizing the supply of power to the power-consuming equipment, and when charging to the stationary battery or the on-board battery based on the instructions is completed, it notifies the user of the completion of charging.

2. The power control system according to claim 1, wherein the control circuit supplies power used by the power-consuming equipment from the on-board battery or stationary battery, which is the discharge side, and further supplies power to the stationary battery or on-board battery to be charged and charges it if there is sufficient capacity in the power supply on the discharge side.

3. It further includes a power circuit for solar power generation that is connected to the solar modules and supplies electricity generated by solar power, The power control system according to claim 1, wherein the control circuit controls the power used by the power-consuming equipment to be supplied by the power generated by the solar power generation, and controls the surplus power to be supplied to the stationary battery or the vehicle battery which is to be charged when there is a surplus of power generated by the solar power generation.

4. The power control system according to claim 3, wherein the control circuit further supplies power from the on-board battery or stationary battery, which is on the discharge side, to the stationary battery or on-board battery to be charged and performs charging.

5. The control circuit uses the electricity generated by the solar power generation, (1) The power used by the power-using equipment, (2) Power to be charged to the stationary battery or the vehicle battery, The power control system according to claim 3, which supplies both of the above, and if there is surplus power, charges the on-board battery or the stationary battery which is the discharge side.

6. It further includes a power circuit for solar power generation that is connected to the solar modules and supplies electricity generated by solar power, The power control system according to claim 1, wherein the control circuit controls the supply of power to the power-using equipment from the stationary storage battery or the vehicle storage battery on the discharge side when the power supplied by the solar power generation is insufficient.

7. The power control system according to claim 6, wherein the control circuit supplies power from the discharge side to the power used by the power-consuming equipment that is insufficient from the power generated by the solar power generation, and if there is surplus power supply capacity on the discharge side, it supplies power to charge the stationary storage battery or the vehicle storage battery that is to be charged.

8. A device connection section to which power-consuming equipment that uses electricity is connected, A battery charging and discharging circuit connected to a stationary battery, which can supply power stored in the stationary battery to the power-consuming equipment connected to the equipment connection section, An EV charging and discharging circuit that, when connected to the on-board battery of an electric vehicle, can supply power stored in the on-board battery to the aforementioned power-consuming equipment, A control circuit for controlling the charging and discharging circuit for the storage battery and the charging and discharging circuit for the EV, It comprises a solar power generation power circuit connected to a solar module to supply electricity generated by solar power, The control circuit controls the charging and discharging of the stationary battery and the on-board battery during independent operation, or the charging and discharging of the on-board battery and the stationary battery. A power control system that, when the power generated by solar power generation is insufficient to supply power to the power-using equipment, controls the system to supply power from the stationary battery or vehicle-mounted battery on the discharge side to the power-using equipment, and when there is sufficient power supply capacity on the discharge side, supplies power to the stationary battery or vehicle-mounted battery that should be charged to charge it, but when the power supplied to the power-using equipment is insufficient from the solar power generation and the stationary battery or vehicle-mounted battery on the discharge side, provides the user with information that there is a power shortage.

9. The control circuit receives instructions from the user and controls the charging and discharging process during autonomous operation based on those instructions. The power control system according to claim 8, wherein the instruction is an instruction to discharge from the stationary storage battery and charge the on-board storage battery or an instruction to discharge from the on-board storage battery and charge the stationary storage battery.

10. The power control system according to claim 1, wherein the control circuit supplies power used by the power-consuming device from the on-board battery or the stationary battery, which is the discharge side, and provides the user with information that it is discharging power to the power-consuming device.

11. The control circuits of power control systems connected to power-consuming equipment, stationary batteries, and on-board batteries of electric vehicles, The steps include receiving instructions from a user to discharge from the stationary battery and charge the vehicle battery during independent operation, or receiving instructions from a user to discharge from the vehicle battery and charge the stationary battery, Steps include starting charging and discharging based on the received instructions, The steps include controlling the charging and discharging process to prioritize power supply to the power-consuming equipment, A power control method comprising the step of notifying the user of the completion of charging when charging to the stationary battery or the vehicle-mounted battery based on the above instruction is terminated.

12. A control circuit of a power control system connected to power-consuming equipment, a stationary storage battery, an on-board storage battery for an electric vehicle, and a solar module for generating solar power, The steps include: starting a charge / discharge control that discharges from the stationary battery and charges the on-board battery, or starting a charge / discharge control that discharges from the on-board battery and charges the stationary battery, based on instructions from the user during autonomous operation; If the power generated by the solar power generation is insufficient to power the power-using equipment, the control is performed to supply power to the power-using equipment from the stationary storage battery or the vehicle storage battery on the discharge side. A power control method comprising the steps of: supplying power to the stationary battery or vehicle battery to be charged to charge it when there is sufficient power supply capacity on the discharge side, but providing information to the user that there is a power shortage when the power supplied to the power-using equipment is insufficient from the solar power generation and the stationary battery or vehicle battery on the discharge side.

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