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 charges and discharges between a stationary storage battery and an in-vehicle storage battery during autonomous operation. [Background technology]

[0002] In a power system connected to a stationary storage battery and an electric vehicle and capable of charging and discharging the stationary storage battery and the on-board storage battery, the power grid may experience a power outage and the system may operate autonomously. During the autonomous operation of the power system, a scenario is envisioned in which the electric vehicle is moved to an area where the power outage is not occurring, the on-board storage battery is charged, and the electric vehicle is then connected to the power system to supply the power stored in the on-board storage battery to the stationary storage battery. Furthermore, for example, a scenario is envisioned in which the power system is equipped with a solar module for generating solar power, and during the autonomous operation, the stationary storage battery is charged with power generated by solar power generation during the day, and the on-board storage battery is then charged with the power stored in the stationary storage battery.

[0003] The following technology is known for effectively utilizing power stored in an in-vehicle storage battery during a power outage. The technology relates to a control system including a mobile first power storage device, a control device capable of controlling the discharge of the first power storage device to in-home electrical appliances, and a server capable of communicating with the control device. The server acquires information about the location of the first power storage device from another device, and if it determines that the first power storage device is located outside the area where the control device is installed, transmits information to the control device prompting charging of the first power storage device. The first power storage device is mobile, for example, mounted on a mobile object such as a vehicle or bicycle or carried by a user. When the first power storage device receives predetermined weather information, such as a heavy rain warning or a storm warning, from the server, it begins charging to fully charge the first power storage device. However, if the first power storage device is not in an area where it can communicate with the control device, such as when the user is out of the home, the control device cannot control the first power storage device in accordance with the weather information. In this case, the server acquires information about the location of the first power storage device from another device, and if it determines that the first power storage device is located outside the area, it transmits information prompting charging of the first power storage device. This is because when a mobile object equipped with the first power storage device returns home and the first power storage device is connected to the control system, more power can be secured in the event of a power outage. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-226211 Summary of the Invention [Problem to be solved by the invention]

[0005] During autonomous operation, it is expected that the power stored in the onboard battery will be supplied to a stationary battery to charge the stationary battery, or conversely, the power stored in the stationary battery will be supplied to the onboard battery to charge the onboard battery. In this way, it is desirable to maintain the power supply to the power-using devices connected to the power system while charging and discharging both. This invention has been made in consideration of the above circumstances, and provides control that maintains power supply to power-using equipment when charging and discharging is performed between a stationary storage battery and an on-board storage battery during autonomous operation. [Means for solving the problem]

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

[0007] From a different perspective, the present invention provides a power control method including the steps of: a control circuit of a power control system connected to an electric power using device, a stationary storage battery, and an on-board storage battery of an electric vehicle receiving instructions from a user; starting charging / discharging by discharging from the stationary storage battery and charging the on-board storage battery or discharging from the on-board storage battery and charging the stationary storage battery during autonomous operation based on the instructions; and controlling the charging / discharging so that the charging / discharging is performed while giving priority to the power supply to the electric power using device during the charging / discharging. [Effects of the Invention]

[0008] In the power control system of the present invention, when controlling charging and discharging by discharging from the stationary storage battery and charging to the vehicle storage battery or discharging from the vehicle storage battery and charging to the stationary storage battery during autonomous operation, the control circuit controls charging and discharging while prioritizing the supply of power to the power-using equipment connected to the equipment connection section, so that the power supply to the power-using equipment can be maintained when charging and discharging between the stationary storage battery and the vehicle storage battery. The power control method according to the present invention also provides the same effects. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is an explanatory diagram illustrating an example of the configuration of a power control system according to a first embodiment. [Figure 2] 2 is an explanatory diagram showing an example of an operation screen displayed on the remote controller shown in FIG. 1; [Figure 3] FIG. 2 is an explanatory diagram showing an example of a V2H operation screen displayed on the remote controller shown in FIG. [Figure 4] 10 is a first flowchart showing the procedure of a process executed by the PCS control circuit shown in FIG. [Figure 5] 10 is a second flowchart showing the procedure of the process executed by the PCS control circuit shown in FIG. [Figure 6] 10 is a third flowchart showing the procedure of the process executed by the PCS control circuit shown in FIG. [Figure 7] 10 is a fourth flowchart showing the procedure of the process executed by the PCS control circuit shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention will be described in more detail below with reference to the accompanying drawings. Note that the following description is given by way of example only in all respects and should not be construed as limiting the present invention. (Embodiment 1) FIG. 1 is an explanatory diagram showing an example of the configuration of a power control system according to a first embodiment of the present invention. The power control system 10 shown in FIG. 1 is 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 unit that connects the power control system 10 to the power grid 15. The power control system 10 shown in FIG. 1 includes a solar power generation system 11, a stationary storage battery system 12, and a V2H system 13. The solar power generation system 11 generates power using sunlight. The stationary storage battery system 12 can store power generated by the solar power generation system 11, power from an onboard storage battery 14B of an EV 14, or power from the power grid 15 in a stationary storage battery 12B. The power stored in the stationary storage battery 12B can be supplied to a power-using device 16 connected to an outlet corresponding to a device connection unit, or to the EV 14 (described later), or can be sold to the power grid 15. EV 14 includes socket 14S, on-board storage battery 14B, and on-board charge / discharge control circuit 14C. Furthermore, V2H system 13 is an electric vehicle charge / discharge system that controls the charging and discharging of on-board storage battery 14B, and when an EV is connected to V2H system 13 as shown in Fig. 1, power supplied from on-board storage battery 14B of EV 14 can be supplied to stationary storage battery system 12 and power-using equipment 16, or sold to power grid 15. Conversely, on-board storage battery 14B of EV 14 can be charged with power supplied from solar power generation system 11, stationary storage battery system 12, or power grid 15.

[0011] As shown in FIG. 1, the solar power generation system 11 includes a solar module 11S, a power conditioner 11P (a power conditioner is also called a PCS or power conditioning system), and a remote controller 11R. The power conditioner 11P includes a PCS control circuit 11C, a solar power generation converter 11D, a bidirectional inverter 11V, and a remote controller 11R. The main body of the power conditioner 11P and the remote controller 11R are physically separated from each other but are connected via communication. The remote controller 11R is also connected via communication to a HEMS controller 17. The HEMS controller 17 communicates with a HEMS server 17S located outside the home via a router 17R and a network. The power conditioner 11P is a component of not only the solar power generation system 11 but also the stationary storage battery system 12 and the V2H system 13.

[0012] The solar module 11S is a power generation device including a plurality of solar cells. When exposed to sunlight, it generates a DC voltage and supplies a DC current based on that voltage to a circuit. The solar power generation 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 generation converter 11D into an AC voltage and outputs it to the power grid 15 and the power consumption device 16 connected to the outlet. Conversely, the bidirectional inverter 11V is a circuit that converts the AC voltage from the power grid 15 into a DC voltage and outputs it to the storage battery converter 12D and the EV converter 13D.

[0013] The stationary storage battery system 12 includes a stationary storage battery 12B and a storage battery converter 12D. Furthermore, as described above, the system also includes a power conditioner 11P and a remote controller 11R. The stationary storage battery 12B is a secondary battery capable of repeated charging and discharging, and is connected to the power conditioner 11P via the storage battery converter 12D. Upon receiving instructions from the PCS control circuit 11C, the storage battery converter 12D converts the DC voltage from the power conditioner 11P to a predetermined DC voltage and outputs the converted DC voltage to the stationary storage battery 12B, thereby charging the stationary storage battery 12B. Conversely, the storage battery converter 12D also converts the DC voltage from the stationary storage battery 12B to a predetermined DC voltage and outputs the converted DC voltage to the power conditioner 11P. This allows power from the stationary storage battery 12B to be supplied to a power consumption device 16 connected to an outlet, an in-vehicle storage battery 14B of an EV 14 connected to the V2H system 13, or a power grid 15.

[0014] The V2H system 13 includes a connector 13C for connecting an EV and an EV converter 13D. The connector 13C includes a connector latch 13L. Furthermore, as described above, the system 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. Then, when the connector 13C is connected to a socket 14S of the EV 14, the EV converter supplies power to the onboard storage battery 14B to charge it. Conversely, the EV converter converts the DC voltage output from the onboard storage battery 14B via the socket 14S and connector 13C to a predetermined DC voltage and supplies it to the power conditioner 11P. This allows the power stored in the onboard storage battery 14B to be supplied to a power-using device 16, a stationary storage battery, or a power grid 15 connected to an outlet. The connector latch 13L is switched between a locked and unlocked state by the PCS control circuit 11C. In the locked state, connector latch 13L physically secures the connection between connector 13C and socket 14S, preventing connector 13C from being removed. In order for a user to remove connector 13C from socket 14S, connector latch 13L must be in the unlocked state.

[0015] The power consumption devices 16 are household electrical appliances, such as air conditioners, cooking appliances, or information devices, and are loads that consume power. The stationary storage battery 12B and the onboard storage battery 14B of the EV 14 are also power loads when they are being charged. The power consumption devices 16 are powered via an appliance connection unit, and as shown in FIG. 1 , power is supplied from the bidirectional inverter 11V or the grid via the distribution board 15B. During stand-alone operation, the power consumption devices 16 are not supplied with power from the grid, so they operate by receiving power from the bidirectional inverter 11V. At this time, the power consumption devices 16 are supplied with power generated by the solar cell module 11S, power discharged from the stationary storage battery 12B, or power discharged from the onboard storage battery 14B via the bidirectional inverter 11V and the distribution board 15B, as shown in FIG. 1 . Meanwhile, the stationary storage battery 12B and the onboard storage battery 14B of the EV 14 are charged without using the distribution board 15B, as shown in FIG. 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 operations.

[0016] The PCS control circuit 11C is a charge / discharge control circuit for the power control system 10, and includes a processor, memory, input / output circuits, communication circuits, and the like. The PCS control circuit 11C is communicatively connected to the solar power generation converter 11D, the bidirectional inverter 11V, the storage battery converter 12D, and the EV converter 13D. The PCS control circuit 11C acquires information regarding the connection or non-connection of the EV 14 via the connector 13C and the charge state (e.g., charging power value, remaining capacity) of the onboard storage battery 14B of the EV 14, and displays this information on the display device of the remote controller 11R. The PCS control circuit 11C also accepts user operations via the remote controller 11R regarding settings related to charging and discharging the EV 14. The PCS control circuit 11C also acquires information regarding the charge state (e.g., charging power value, remaining capacity) of the stationary storage battery 12B of the stationary storage battery system 12, and displays this information on the display device of the remote controller 11R. The PCS control circuit 11C also accepts user operations via the remote controller 11R regarding settings related to charging and discharging the stationary storage battery 12B. Furthermore, the PCS control circuit 11C acquires information on the charge state (charging power value, remaining capacity, etc.) of the stationary storage battery 12B of the stationary storage battery system 12, and displays it on the display device of the remote controller 11R. Also, the PCS control circuit 11C accepts user operations via the remote controller 11R regarding settings related to charging and discharging of the stationary storage battery 12B.

[0017] To charge EV 14, the user connects connector 13C to socket 14S provided on EV 14. This connects a power line between EV converter 13D of V2H system 13 and on-board storage battery 14B, and a communication line between EV converter 13D and on-board charge / discharge control circuit 14C. This enables communication between the processor of PCS control circuit 11C and on-board charge / discharge control circuit 14C, enabling power to be supplied to on-board storage battery 14B while exchanging information with EV 14. The on-board charge / discharge control circuit 14C includes a processor, memory, input / output circuits, communication circuits, etc., and controls communication with V2H system 13 and charging / discharging of on-board storage battery 14B.

[0018] The PCS control circuit 11C causes the remote controller 11R to display the charge and discharge amounts of the onboard storage battery 14B of the EV 14 connected to the connector 13C and the charge and discharge amounts of the stationary storage battery 12B. In addition, the remote controller 11R may display information related to the power control of the power control system 10 executed by the power conditioner 11P. For example, the remote controller 11R may display information such as power consumption based on voltage and current values ​​related to power transmitted to and received from the power grid 15, detected by a smart meter (not shown in FIG. 1). The remote controller 11R may also display the power and amount of power purchased from and sold to the power grid 15 by the power control system 10. Furthermore, the remote controller 11R may display the amount of power generated by the solar module 11S, the amount of energy stored in the stationary storage battery 12B or the onboard storage battery 14B, the state of charge (SOC), the amount of charge and discharge, or the charge and discharge power.

[0019] The HEMS controller 17 communicates with the solar power generation system 11, the stationary battery system 12, and the V2H system 13 to perform power control for the power control system 10. Specifically, the HEMS controller 17 communicates with a remote controller 11R for the power conditioner 11P. The HEMS controller 17 also communicates with an information device 17D, such as a user's smartphone, to provide information related to power control and accept user settings related to power control. The remote controller 11R may also function as the information device 17D, communicate with the HEMS controller 17 to provide information related to power control, and accept user settings related to power control. Conversely, the mobile information device may also function as the remote controller 11R. In the example shown in FIG. 1, the storage 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] <V2H system operation> An example of the procedure for a user to operate the V2H system 13 to instruct charging and discharging of the onboard storage battery 14B of an EV 14 in the power control system 10 shown in Fig. 1 will be described. Fig. 2 is an explanatory diagram showing an example of an operation screen displayed on a display device provided in the remote controller 11R shown in Fig. 1. The operation screen shown in Fig. 2 is an example of a top screen that provides comprehensive information about the power control system 10. The PCS control circuit 11C causes the remote controller 11R to display a top screen 20 as shown in Fig. 2. From the left end to the right end of the top screen 20, a photovoltaic power generation information display area 21, a V2H information display area 22, a stationary storage battery information display area 23, and a power consumption / power sold and purchased display area 24 are arranged in this order, as shown by dashed-line frames, respectively.

[0021] The photovoltaic power generation information display area 21 provides information such as the power generated by the photovoltaic power generation system 11. The V2H information display area 22 provides information such as the charge / discharge state of the in-vehicle storage battery 14B. The stationary storage battery information display area 23 provides information such as the charge / discharge state of the stationary storage battery 12B. The power consumption / purchased power display area 24 provides information related to the power consumption, power sale or purchase state, and the power of the power control system 10. A [V2H operation] button 25 is arranged in the V2H information display area 22. When the [V2H operation] button 25 is touched by the user, the PCS control circuit 11C switches the top screen 20 to a V2H operation screen 30 shown in FIG. 3 in response to the operation.

[0022] The V2H operation screen 30 has a "Manual Charge" button 31, an "Automatic Operation" button 32, a "Charge from Stationary Storage Battery" button 33, a "Discharge to Stationary Storage Battery" button 34, a "Disconnect EV" 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 connector is disconnected from the EV. The operation mode of the V2H system 13 is also displayed in V2H mode information 37. The PCS control circuit 11C selectively displays the "Manual Charge" button 31 and two buttons: the "Charge from Stationary Storage Battery" button 33 and the "Discharge to Stationary Storage Battery" button 34. During grid-connected operation in which the power grid 15 can send and receive power to and from the power control system 10, the [Manual charge] button 31 is displayed, but the [Charge from stationary storage battery] button 33 and the [Discharge to stationary storage battery] button 34 are not displayed. On the other hand, during independent operation in which 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 storage battery] button 33, the [Discharge to stationary storage battery] button 34, and the [Manual charge] button 31 are displayed.

[0023] When the [Manual Charge] button 31 is touched by the user while the connector 13C is connected to the socket 14S of the EV 14, the PCS control circuit 11C responds to the operation by starting the charging process for the vehicle-mounted storage battery. When the [Automatic Driving] button 32 is touched, the PCS control circuit 11C responds to the operation by starting the charging / discharging process for the vehicle-mounted storage battery in the mode set on the operation screen. When the [Charge from Stationary Storage Battery] button 33 is touched, the PCS control circuit 11C responds to the operation by starting the charging process from the stationary storage battery 12B to the vehicle-mounted storage battery 14B. On the other hand, when the [Discharge to Stationary Storage Battery] button 34 is touched, the PCS control circuit 11C responds to the operation by starting the discharging process from the vehicle-mounted storage battery 14B to the stationary storage battery 12B. The PCS control circuit 11C selectively displays the [Manual Charge] button 31 and two buttons: the [Charge from Stationary Storage Battery] button 33 and the [Discharge to Stationary Storage Battery] button 34. When the power control system 10 is in grid-connected operation, the [Manual charge] button 31 is displayed, but the [Charge from stationary storage battery] button 33 and the [Discharge to stationary storage battery] button 34 are not displayed. On the other hand, when the power control system 10 is in independent operation, the [Charge from stationary storage battery] button 33 and the [Discharge to stationary storage battery] button 34 are displayed, but the [Manual charge] button 31 is not displayed.

[0024] The [Charge from Stationary Storage Battery] button 33 and the [Discharge to Stationary Storage Battery] button 34 are intended to be operated when the power grid 15 experiences a power outage and the power control system 10 is operating autonomously. That is, the [Charge from Stationary Storage Battery] button 33 is intended to be operated when electricity generated by the solar power generation system 11 during the daytime during autonomous operation is stored in the stationary storage battery 12B and the stored electricity is supplied to the EV 14. The [Discharge to Stationary Storage Battery] button 34 is intended to be operated when the EV 14 is connected to the V2H system 13 and the electricity stored in the on-board storage battery 14B is supplied to the stationary storage battery 12B after the EV 14 is moved to an area without a power outage and the on-board storage battery 14B is charged, or before the EV 14 is moved. Therefore, the [Charge from Stationary Storage Battery] button 33 and the [Discharge to Stationary Storage Battery] button 34 are enabled when the power grid 15 experiences a power outage and the power control system 10 is operating autonomously.

[0025] When the "Charge from Stationary Storage Battery" button 33 is touched while the power control system 10 is in autonomous operation, the PCS control circuit 11C controls the storage battery converter 12D and the EV converter 13D to charge the vehicle storage battery 14B with the power stored in the stationary storage battery 12B. When the "Discharge to Stationary Storage Battery" button 34 is touched during autonomous operation, the PCS control circuit 11C controls the storage battery converter 12D and the EV converter 13D to charge the stationary storage battery 12B with the power stored in the vehicle storage battery 14B. In either case, however, if there is a power consumption device 16 using power, priority is given to the power supply to that power consumption device 16. That is, when charging the vehicle storage battery 14B with the power stored in the stationary storage battery 12B, the PCS control circuit 11C controls the bidirectional inverter 11V, the storage battery converter 12D, and the EV converter 13D as follows: While giving priority to the power supply to the power consumption device 16, if there is any surplus in the power supply capacity of the stationary storage battery 12B, that amount of power is supplied to the in-vehicle storage battery 14B to charge it. Furthermore, when charging the stationary storage battery 12B with the power stored in the in-vehicle storage battery 14B, the bidirectional inverter 11V, the storage battery converter 12D, and the EV converter 13D are controlled as follows. That is, while giving priority to the power supply to the power consumption device 16, if there is any surplus in the power supply capacity of the in-vehicle storage battery 14B, that amount of power is supplied to the stationary storage battery 12B to charge it. By controlling in this manner, the power supply to the power consumption device is maintained when charging and discharging are performed between the stationary storage battery and the in-vehicle storage battery during autonomous operation.

[0026] In this way, during independent operation in which 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 Storage Battery] button 33 and the [Discharge to Stationary Storage Battery] button 34 are displayed to notify the user that it is possible to accept an instruction to discharge from the stationary storage battery 12B and charge the in-vehicle storage battery 14B or an instruction to discharge from the in-vehicle storage battery 14B and charge the stationary storage battery 12B. Furthermore, by touching the [Charge from Stationary Storage Battery] button 33 during independent operation, an instruction from the user to discharge from the stationary storage battery 12B and charge the in-vehicle storage battery 14B is accepted, and by touching the [Discharge to Stationary Storage Battery] button 34, an instruction from the user to discharge from the in-vehicle storage battery 14B and charge the stationary storage battery 12B is accepted. The PCS control circuit 11C controls the storage battery converter 12D and the EV converter 13D to discharge the power stored in the stationary storage battery 12B to charge the in-vehicle storage battery 14B, or to discharge the power stored in the in-vehicle storage battery 14B to charge the stationary storage battery 12B. However, although the instruction from the user is either an instruction to discharge the power from the stationary storage battery 12B and charge the in-vehicle storage battery 14B, or an instruction to discharge the power from the in-vehicle storage battery 14B and charge the stationary storage battery 12B, in either case, if there is a power consumption device 16 using power, the supply of power to that power consumption device 16 takes priority over charging. That is, the PCS control circuit 11C supplies the power used by the power-using equipment 16 from the discharging side, which is the in-vehicle storage battery 14B or the stationary storage battery 12B, and if there is surplus power supply capacity on the discharging side, supplies power to the stationary storage battery 12B or the in-vehicle storage battery 14B to be charged, thereby charging the battery.

[0027] Here, in the case of an instruction to discharge from stationary storage battery 12B and charge in-vehicle storage battery 14B, stationary storage battery 12B is the discharging side, and on-vehicle storage battery 14B is the battery to be charged. Similarly, in the case of an instruction to discharge from in-vehicle storage battery 14B and charge stationary storage battery 12B, stationary storage battery 14B is the discharging side, and on-vehicle storage battery 12B is the battery to be charged. In this way, by prioritizing the supply of power to power usage equipment 16 over charging, it is possible to maintain the power supply to power usage equipment 16. For example, if a user issues an instruction to discharge from stationary storage battery 12B and charge in-vehicle storage battery 14B or an instruction to discharge from in-vehicle storage battery 14B and charge stationary storage battery 12B during autonomous driving, and the charging / discharging is prioritized, there is a risk that the power supply to power usage equipment 16 will be cut off. In this embodiment, even if the instruction from the user is either an instruction to discharge from stationary storage battery 12B and charge in-vehicle storage battery 14B or an instruction to discharge from in-vehicle storage battery 14B and charge stationary storage battery 12B, it is possible to maintain the power supply to power usage equipment 16 by prioritizing the power supply to power usage equipment 16 over charging.

[0028] (Embodiment 2) In the first embodiment, the power supply source for the power control system 10 during autonomous operation is the stationary storage battery 12B or the vehicle-mounted storage battery 14B. For example, the period from sunset to sunrise when solar power generation is not performed corresponds to the first embodiment. Furthermore, a configuration in which the power control system 10 does not include the solar module 11S also corresponds to the first embodiment. In this embodiment, a case in which solar power generation by the solar module 11S is also used as a power supply source is described. Note that similar control is applicable not only to solar power generation but also to a case in which the power control system 10 includes a private power generation system. During the daytime when solar power generation is performed by the solar module 11S, the PCS control circuit 11C controls the solar power generation converter 11D, the bidirectional inverter 11V, the storage battery converter 12D, and the EV converter 13D as follows. That is, if there is a power consumption device 16 using power, the power generated by solar power generation is supplied to that power consumption device 16 with priority. For example, when the vehicle-mounted storage battery 14B is being charged with power stored in the stationary storage battery 12B and there is surplus power generated by solar power generation, the surplus power is supplied to the vehicle-mounted storage battery 14B for charging. That is, the power generated by solar power generation is supplied to the power usage device 16 and the vehicle-mounted storage battery 14B, and power is also supplied from the discharging side (discharging side) of the stationary storage battery 12B to the vehicle-mounted storage battery 14B.

[0029] If there is any surplus power generated by solar power generation, the surplus power is supplied to stationary storage battery 12B for charging. That is, the power generated by solar power generation is supplied to power usage device 16, on-board storage battery 14B, and stationary storage battery 12B. Since on-board storage battery 14B on the side to be charged (charging side) is charged with power generated by solar power, stationary storage battery 12B on the discharging side does not need to supply power to on-board storage battery 14B. However, if the power generated by solar power that charges on-board storage battery 14B on the charging side does not reach the rated charging power of on-board storage battery 14B, stationary storage battery 12B on the discharging side may further supply power to on-board storage battery 14B. When stationary storage battery 12B is being charged with power stored in in-vehicle storage battery 14B, the charging side and discharging side are reversed from the example described above, but the control is the same in that solar-generated power is supplied preferentially to power usage device 16, surplus power is supplied to the charging side, and if there is any surplus power, it is supplied to the discharging side. Also, the control is the same in that surplus power is supplied to the charging side, and when the rated power of the charging side is not reached, further power is supplied from the discharging side.

[0030] In this embodiment, during autonomous operation, touching the "Charge from Stationary Storage Battery" button 33 accepts a user instruction to discharge stationary storage battery 12B and charge vehicle-mounted storage battery 14B, and touching the "Discharge to Stationary Storage Battery" button 34 accepts a user instruction to discharge vehicle-mounted storage battery 14B and charge stationary storage battery 12B. Then, PCS control circuit 11C controls storage battery converter 12D and EV converter 13D to discharge the power stored in stationary storage battery 12B to charge vehicle-mounted storage battery 14B, or to discharge the power stored in vehicle-mounted storage battery 14B to charge stationary storage battery 12B. However, priority is given to the use of power generated by solar power generation over the charging and discharging. That is, the PCS control circuit 11C supplies power used by the power consumption device 16 from solar power generation, and if there is surplus power, supplies power to the stationary storage battery 12B or the in-vehicle storage battery 14B to be charged to charge it, and if there is further surplus power, charges the in-vehicle storage battery 14B or the stationary storage battery 12B, which is the discharging side. The PCS control circuit 11C also supplies power used by the power consumption device 16 from solar power generation, and if there is surplus power, supplies power to the stationary storage battery 12B or the in-vehicle storage battery 14B to be charged to charge it, and further charges the stationary storage battery 12B or the in-vehicle storage battery 14B to be charged from the discharging side, the in-vehicle storage battery 14B or the stationary storage battery 12B. Here, in the case of an instruction to discharge from the stationary storage battery 12B and charge the in-vehicle storage battery 14B, the discharging side is the stationary storage battery 12B, and the one to be charged is the in-vehicle storage battery 14B. Similarly, in the case of an instruction to discharge power from in-vehicle storage battery 14B and charge stationary storage battery 12B, the discharging side is in-vehicle storage battery 14B, and the side to be charged is stationary storage battery 12B. In this way, by prioritizing the use of power generated by solar power generation, it is possible to maintain the power supply to power usage device 16, and further, to charge stationary storage battery 12B or in-vehicle storage battery 14B that is to be charged, while suppressing a decrease in the power stored in in-vehicle storage battery 14B or stationary storage battery 12B that is the discharging side.

[0031] (Embodiment 3) In the second embodiment, the case where the power generated by solar power generation can cover the power used by the power consumption devices 16 is described. In this embodiment, the case where the power generated by solar power generation alone cannot cover the power used by the power consumption devices 16 is described. For example, when the vehicle storage battery 14B is charged with the power stored in the stationary storage battery 12B, a situation may arise in which the power supplied by solar power generation alone is insufficient to supply the power consumption devices 16. In this case, the PCS control circuit 11C controls the solar power generation converter 11D, the bidirectional inverter 11V, the storage battery converter 12D, and the EV converter 13D to supply the shortfall of power from the discharging-side stationary storage battery 12B to the power consumption devices 16.

[0032] If the discharging-side stationary storage battery 12B has a surplus in its power supply capacity, the PCS control circuit 11C charges the charging-side in-vehicle storage battery 14B with that surplus power. When the stationary storage battery 12B is being charged with power stored in the in-vehicle storage battery 14B, the charge side and discharge side are reversed from the example described above. In this case, too, the discharge side preferentially supplies the power that is insufficient from solar power generation alone to the power usage device 16, and if there is a surplus in the power supply capacity of the discharge side, the surplus power is supplied to the charge side for charging, in the same manner.

[0033] In this embodiment, during autonomous operation, touching the "Charge from Stationary Storage Battery" button 33 accepts a user instruction to discharge stationary storage battery 12B and charge vehicle-mounted storage battery 14B, and touching the "Discharge to Stationary Storage Battery" button 34 accepts a user instruction to discharge vehicle-mounted storage battery 14B and charge stationary storage battery 12B. Then, PCS control circuit 11C controls storage battery converter 12D and EV converter 13D to discharge the power stored in stationary storage battery 12B to charge vehicle-mounted storage battery 14B, or to discharge the power stored in vehicle-mounted storage battery 14B to charge stationary storage battery 12B. However, priority is given to the use of power generated by solar power generation over the charging and discharging. That is, the PCS control circuit 11C supplies power used by the power consumption devices 16 from solar-generated power, and if the solar-generated power is insufficient to be used by the power consumption devices 16, it also supplies power from the on-board storage battery 14B or the stationary storage battery 12B, which is the discharging side, to the power consumption devices 16. Furthermore, if there is surplus power supply capacity on the discharging side, it supplies power to the stationary storage battery 12B or the on-board storage battery 14B to be charged, and charges them. Here, in the case of an instruction to discharge from the stationary storage battery 12B and charge the on-board storage battery 14B, the discharging side is the stationary storage battery 12B, and the battery to be charged is the on-board storage battery 14B. Similarly, in the case of an instruction to discharge from the on-board storage battery 14B and charge the stationary storage battery 12B, the discharging side is the on-board storage battery 14B, and the battery to be charged is the stationary storage battery 12B. In this way, by prioritizing the use of power generated by solar power generation, it is possible to maintain the power supply to the power-using device 16, and further, to charge the stationary storage battery 12B or the vehicle storage battery 14B that is to be charged while suppressing the decrease in the power stored in the vehicle storage battery 14B or the stationary storage battery 12B that is the discharging side.

[0034] It may happen that the power generated by solar power generation alone is not enough to cover the power used by the power consumption devices 16, and even if the power stored on the discharge side is supplied, it is not enough to cover the power used by the power consumption devices 16. In this case, the PCS control circuit 11C provides information to the user that there is a power shortage. Specifically, it causes the remote controller 11R to display a message that the power used by the power consumption devices 16 cannot be covered and that the power supply from the V2H system 13 has been stopped. In addition, it may also cause the user's information device 17D to display information that the power supply from the V2H system 13 has been stopped due to a power shortage via the HEMS controller 17.

[0035] <Flowchart> The processing executed by the PCS control circuit 11C in the first to third embodiments will be described with reference to flowcharts. FIGS. 4 to 7 are flowcharts showing the procedure of the processing executed by the PCS control circuit 11C shown in FIG. 1. FIG. 4 mainly shows the processing flow when the [V2H Operation] button 25 on the top screen 20 is touched during autonomous operation to display the V2H operation screen 30, and the [Charge from Stationary Storage Battery] button 33 or the [Discharge to Stationary Storage Battery] button is touched on the V2H operation screen 30. As shown in FIG. 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 the system is in autonomous operation (step S13). If the system is not in autonomous operation, i.e., if the system is in grid-connected operation (No in step S13), the PCS control circuit 11C causes the remote controller 11R to display the V2H operation screen 30 corresponding to grid-connected operation. This is the screen on which the "Manual charging" button 31, "Autonomous driving" button 32, "EV disconnection" button 35, and "Back" button 36 are active. If an instruction is received on the V2H operation screen 30, processing is performed according to the received instruction (step S15). Then, the processing returns to the above-mentioned step S13, and the determination on the V2H operation screen is repeated. Here, the focus is on the processing during autonomous driving, so details are omitted.

[0036] If the power control system 10 is in autonomous operation as determined in step S13 (Yes in step S13), the PCS control circuit 11C causes the remote controller 11R to display a V2H operation screen for autonomous operation. The [Manual Charge] button 31, [Automatic Operation] button 32, [Charge from Stationary Storage Battery] button 33, [Discharge to Stationary Storage Battery] button 34, [Disconnect EV] button 35, and [Back] button 36 are enabled on this screen. The PCS control circuit 11C then determines whether the [Charge from Stationary Storage Battery] button 33 has been touched (step S19). If the PCS control circuit 11C determines that the [Charge from Stationary Storage Battery] button 33 has been touched (Yes in step S19), the PCS control circuit 11C sets the stationary storage battery 12B as the discharge side and the vehicle storage battery 14B as the charge side (step S21), and then executes a subroutine related to the direct charging process (step S23). The process then returns to step S13, and the determination on the V2H operation screen is repeated. The details of the processing related to the subroutine for the direct charging processing will be described later with reference to Fig. 5 onwards. In Figs. 4 to 7, the direct charging processing refers to a charging processing in which the stationary storage battery 12B is discharged and the in-vehicle storage battery 14B is charged, or a charging processing in which the in-vehicle storage battery 14B is discharged and the stationary storage battery 12B is charged.

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

[0038] If it is determined in the aforementioned step S25 that the [Discharge to stationary storage battery] button 34 has not been touched (No in step S25), the PCS control circuit 11C then determines whether or not the [Back] button 36 has been touched (step S29). If it is determined 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 the aforementioned step S11, and the determination of whether or not the [V2H operation] button 25 on the top screen 20 has been touched is repeated.

[0039] If it is determined in the aforementioned step S29 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), processing according to the touched button is performed (step S35). Then, the processing returns to the aforementioned step S13, and the determination on the V2H operation screen is repeated. Here, attention is focused on the processing when the [Charge from Stationary Storage Battery] button 33 and the [Discharge to Stationary Storage Battery] button 34 are touched, so details are omitted.

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

[0041] In step S65, the PCS control circuit 11C determines whether there is a margin in the power supply capacity on the discharge side. If there is not a margin in the power supply capacity on the discharge side (No in step S65), the PCS control circuit 11C determines whether there is a shortage of power to be supplied to the power usage device 16 (step S91 shown in FIG. 7). If it is determined that there is a shortage of power to be supplied to the power usage device 16 (Yes in step S91), the PCS control circuit 11C causes the remote controller 11R to display a message indicating that there is a shortage of power to be supplied to the power usage device 16 (step S91). Furthermore, a notification to that effect may be sent to the user's information device 17D via the HEMS controller 17 or the like. Then, power is not supplied from the discharge side to the charge side (step S95), and the direct charging process subroutine is terminated.

[0042] If it is determined in step S65 that the discharge side has sufficient power supply capacity (Yes in step S65), the PCS control circuit 11C controls the discharge side to supply power to charge the charge side. That is, even during the direct charging process, the PCS control circuit 11C prioritizes power supply to the power consumption device 16 over power supply to the charge side. First, the PCS control circuit 11C supplies power from the discharge side to the charge side to charge the charge side (step S69). Then, the PCS control circuit 11C displays on the remote controller 11R that charging / discharging from the discharge side to the charge side is being performed (step S67). While charging is being performed, the PCS control circuit 11C determines whether or not charging to the charge side should be terminated (step S71). Examples of situations that warrant termination of charging include when the charge side is fully charged or when the discharge side is no longer able to discharge. However, other situations may occur, such as when there is no power available to supply to the charge side due to fluctuations in power generated by solar power generation or fluctuations in the power to be supplied to the power consumption device 16. Furthermore, there may be a case where the connection between the connector 13C of the V2H system 13 and the EV 14 is released.

[0043] If it is determined that charging should be terminated (Yes in step S71), the PCS control circuit 11C stops the power supply to the charging side and causes the remote controller 11R to display a message indicating that charging has been terminated (step S73). For example, a message indicating that charging has been terminated may be displayed for a predetermined period of time, or an icon or button may be displayed to notify the user that charging has been terminated. The subroutine for the direct charge / discharge process is then 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 the process to step S41. Then, the PCS control circuit 11C determines the presence and amount of power generated by solar power and power used by the power consumption device 16, and continues the process of supplying power to the power consumption device 16 and the charging side according to the situation.

[0044] The above description applies to the case where it is determined in step S41 that power is not being generated by solar power generation. On the other hand, if power is being generated by solar power generation (Yes in step S41), the PCS control circuit 11C performs the following process. First, it determines whether there is any power consumption device 16 to which power should be supplied (step S43). That is, it determines whether there is any power consumption device 16 in operation. If there is no power consumption 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 any power consumption device 16 in operation, the PCS control circuit 11C supplies solar-generated power to the power consumption device 16 (step S45). Then, it determines whether there is surplus power generated by solar power generation even after supplying power to the power consumption device 16 (step S47). If there is surplus power (Yes in step S47), the PCS control circuit 11C supplies the surplus power to the charging side to perform charging. That is, even during the execution of the direct charging process, the supply of power to the power using device 16 is prioritized over the supply of power to the charging side. First, the system controls the supply of surplus power generated by solar power to the charging side for charging (step S49). Then, the system causes the remote controller 11R to display a message indicating that the surplus power generated by solar power is being used to charge the charging side (step S51).

[0045] Furthermore, the PCS control circuit 11C determines whether or not there is surplus power generated by solar power generation even after supplying power to the charging side (step S53). If there is surplus power (Yes in step S53), the PCS control circuit 11C supplies the surplus power to the discharging side, thereby charging the discharging side as well (step S55). Next, the remote controller 11R displays a message that the charging side is being charged with surplus power generated by solar power (step S56). Since not only the charging side but also the discharging side is charged with power generated by solar power, in this state the discharging side does not discharge power to the charging side or to the power using device 16. While charging is in progress, the PCS control circuit 11C determines whether or not charging to the charging side should be terminated (step S71). The subsequent processing is as described above.

[0046] If it is determined in step S53 that power can be supplied to the charging side but not to the discharging side (No in step S53), the PCS control circuit 11C determines whether charging is possible using power from the discharging side in addition to power generated by solar power (step S57). If charging is possible using power from the discharging side in addition to power generated by solar power (Yes in step S57), the PCS control circuit 11C supplies power from the discharging side to the charging side to perform charging (step S69 shown in FIG. 5). While charging is being performed, the PCS control circuit 11C determines whether charging to the charging side should be terminated (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 charging to the charging side should be terminated without supplying power from the discharging side to the charging side (step S71 shown in FIG. 5). The subsequent processing is as described above.

[0047] If it is determined in step S47 that there is no surplus power generated by solar power generation (No in step S47), the PCS control circuit 11C determines whether the power to be supplied to the power consumption device 16 is insufficient using only solar power generation (step S81 shown in FIG. 6). If it is determined that there is a power shortage (Yes in step S83), the PCS control circuit 11C causes the discharging side to supply the power consumption device 16 with the shortage of power (step S83). Then, the remote controller 11R displays a message that discharging is being performed from the discharging side to the power consumption device 16 (step S85). Then, the process proceeds to the determination in step S65 in FIG. 5. On the other hand, if it is determined in step S83 that there is no shortage of power to be supplied to the power consumption device 16 (No in step S81), the PCS control circuit 11C does not cause the discharging side to supply power, and proceeds to the determination in step S65 in FIG. 5.

[0048] As mentioned above, (i) A power control system according to the present invention comprises an equipment connection unit to which power-using equipment that uses power is connected; a battery charging / discharging circuit that is connected to a stationary storage battery and is capable of supplying the power stored in the stationary storage battery to the power-using equipment connected to the equipment connection unit; an EV charging / discharging circuit that is connected to an on-board storage battery of an electric vehicle and is capable of supplying the power stored in the on-board storage battery to the power-using equipment when the EV charging / discharging circuit is connected to the on-board storage battery of an electric vehicle; and a control circuit that controls the battery charging / discharging circuit and the EV charging / discharging circuit, wherein the control circuit controls the charging / discharging so as to give priority to the supply of power to the power-using equipment when performing charge / discharge control to discharge power from the stationary storage battery and charge the on-board storage battery or charge / discharge control to discharge power from the on-board storage battery and charge the stationary storage battery during autonomous operation.

[0049] In the present invention, the power consuming appliances are loads that consume power, such as air conditioners, cooking appliances, and information appliances. The EV charging / discharging circuit is a circuit for charging / discharging an on-board storage battery. The EV converter in the above-described 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 an EV. The PCS control circuit in the above-described embodiment corresponds to the charge / discharge control circuit of this invention. During autonomous operation, when discharging from a stationary storage battery and charging the vehicle storage battery, or discharging from a vehicle storage battery and charging the stationary storage battery, the power supply to the power-using equipment can be maintained by controlling the system to prioritize power supply to the power-using equipment over the charging and discharging.

[0050] Further, preferred embodiments of the present invention will be described. (ii) The vehicle may further include a solar power generation power circuit connected to the solar module to supply power generated by solar power, and the control circuit may control the power generated by the solar power generation to cover the power used by the power-using device, and may control the power generated by the solar power generation to be supplied to the stationary storage battery or the vehicle-mounted storage battery to be charged when there is surplus power. According to this aspect, the power used by the power-using devices can be covered by the power generated by solar power, and if there is any surplus power, the surplus power can be used to charge the stationary storage battery or the vehicle-mounted storage battery that needs to be charged. Furthermore, control may be performed so that power is supplied from the vehicle-mounted storage battery or the stationary storage battery on the discharging side to the stationary storage battery or the vehicle-mounted storage battery to be charged, thereby charging the battery. According to this aspect, the power used by the power-using equipment is supplied by power generated by solar power, and if there is any surplus power, the surplus power is used to charge the stationary storage battery or vehicle-mounted storage battery that is to be charged, and if the charging power of the stationary storage battery or vehicle-mounted storage battery that is to be charged has not yet reached the rated power, the battery on the discharging side can be discharged to increase the charge.

[0051] (iii) The control circuit supplies the power generated by the solar power generation to (1) the power used by the power-using equipment and (2) the power to the stationary storage battery or the vehicle-mounted storage battery to be charged, and if there is surplus power, it may charge the vehicle-mounted storage battery or the stationary storage battery, which is the discharging side. According to this aspect, the power used by the power-using devices and the charging power for the stationary storage battery or vehicle-mounted storage battery to be charged are covered by power generated by solar power, and if there is any surplus power, the surplus power can be used to charge the vehicle-mounted storage battery or stationary storage battery on the discharging side. That is, the power used by the power-using devices and the stationary storage battery and vehicle-mounted storage battery can be charged with power generated by solar power. The stationary storage battery or vehicle-mounted storage battery to be charged can be charged while maintaining the power supply to the power-using devices and maintaining the power stored in the vehicle-mounted storage battery or stationary storage battery on the discharging side.

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

[0053] (v) The control circuit may supply from the discharge side the power used by the power-using 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, may supply power to the stationary storage battery or the vehicle-mounted storage battery to be charged, thereby charging the battery. According to this aspect, when the supply of power used by the power-using devices is insufficient from the power generated by solar power alone and the shortfall is supplied from the on-board storage battery or stationary storage battery on the discharging side, the stationary storage battery or on-board storage battery can be charged with the surplus power supply capacity on the discharging side.The stationary storage battery or on-board storage battery to be charged can be charged while maintaining the power supply to the power-using devices and suppressing the decrease in power stored in the on-board storage battery or stationary storage battery on the discharging side.

[0054] (vi) When the power supplied to the power-using device from the solar power generation system and the stationary storage battery or the vehicle-mounted storage battery on the discharge side is insufficient, the control circuit may provide information to the user that there is a power shortage. According to this aspect, when the supply of power used by the power-using equipment is insufficient due to the power generated by solar power generation and the power from the on-board storage battery or stationary storage battery on the discharging side, the user can be notified of the power shortage.

[0055] (vii) One aspect of the present invention includes a power control method including the steps of: a control circuit of a power control system connected to an electric power using device, a stationary storage battery, and an on-board storage battery of an electric vehicle receiving a user instruction; starting, based on the instruction, charging / discharging by discharging from the stationary storage battery and charging the on-board storage battery during autonomous operation, or starting charging / discharging by discharging from the on-board storage battery and charging the stationary storage battery; and controlling the charging / discharging so that, during the charging / discharging, the charging / discharging is performed while giving priority to the power supply to the electric power using device. During autonomous operation, when discharging from a stationary storage battery and charging the vehicle storage battery, or discharging from a vehicle storage battery and charging the stationary storage battery, the power supply to the power-using equipment can be maintained by controlling the system to prioritize power supply to the power-using equipment over the charging and discharging.

[0056] The aspects of the present invention also include combinations of any of the above-described aspects. In addition to the above-described embodiment, various modifications of the present invention are possible. These modifications should not be interpreted as not falling within the scope of the present invention. The present invention should include all modifications and equivalents to the scope of the claims. [Explanation of symbols]

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

Claims

1. a device connection section to which a power consumption device that consumes power is connected; a battery charge / discharge circuit connected to a stationary storage battery so as to supply the electric power stored in the stationary storage battery to the power consumption device connected to the device connection section; a charging / discharging circuit for an EV that, when connected to an on-board storage battery of an electric vehicle, can supply electric power stored in the on-board storage battery to the power consumption device; a control circuit for controlling the storage battery charge / discharge circuit and the EV charge / discharge circuit, The control circuit is a power control system that controls charging and discharging so as to prioritize power supply to the power-using equipment when performing charge and discharge control to discharge the stationary storage battery and charge the vehicle-mounted storage battery during autonomous operation, or when performing charge and discharge control to discharge the vehicle-mounted storage battery and charge the stationary storage battery.

2. 2. The power control system according to claim 1, wherein the control circuit supplies the power used by the power-using equipment from the on-board storage battery or the stationary storage battery, which is the discharging side, and further, when there is an excess power supply capacity on the discharging side, supplies power to the stationary storage battery or the on-board storage battery to be charged, thereby charging the battery.

3. a solar power generation power circuit connected to the solar module to supply power generated by solar power; 2. The power control system according to claim 1, wherein the control circuit controls the power generated by the solar power generation system to cover the power used by the power-using equipment, and controls the power generated by the solar power generation system to supply the surplus power to the stationary storage battery or the vehicle storage battery to be charged when there is surplus power.

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

5. The control circuit is powered by the solar power generation. (1) The power used by the power-using device; (2) power to the stationary battery or the vehicle battery to be charged; and if there is surplus power, charging is performed to the vehicle storage battery or the stationary storage battery, which is the discharge side.

6. a solar power generation power circuit connected to the solar module to supply power generated by solar power; 2. The power control system according to claim 1, wherein the control circuit controls the supply of power to the power-using equipment from the discharge-side stationary storage battery or the vehicle-mounted storage battery when the power generated by the solar power generation is insufficient to be used by the power-using equipment.

7. 7. The power control system according to claim 6, wherein the control circuit supplies from the discharge side power that is insufficient from the power generated by the solar power generation among the power used by the power-using equipment, and further, when there is surplus power supply capacity on the discharge side, supplies power to the stationary storage battery or the vehicle-mounted storage battery to be charged, thereby charging the battery.

8. The power control system according to claim 7, wherein when the power supplied to the power-using device from the solar power generation system and the stationary storage battery or the vehicle-mounted storage battery on the discharge side is insufficient, the control circuit provides a user with information that there is a power shortage.

9. the control circuit provides information to a user and receives instructions, and controls the charging and discharging to be performed during independent operation based on the instructions; The power control system according to claim 1 , wherein the instruction is an instruction to discharge the stationary storage battery and charge the vehicle-mounted storage battery, or an instruction to discharge the vehicle-mounted storage battery and charge the stationary storage battery.

10. The control circuit of the power control system connected to the power-using equipment, stationary storage batteries, and on-board storage batteries of electric vehicles is accepting a user instruction; a step of starting charging / discharging by discharging the stationary storage battery and charging the vehicle-mounted storage battery or by discharging the vehicle-mounted storage battery and charging the stationary storage battery during stand-alone operation based on the instruction; and controlling the charging and discharging so that the charging and discharging is performed while giving priority to power supply to the power consumption device.

Images