Power supply system

Abstract

Provided is a power supply system capable of automatically switching between power supply from system power to a specific load and power supply from an electric vehicle to the specific load, and capable of simplifying a device. In a power supply system provided with a system circuit breaker electrically connected to a system, a specific circuit breaker mounted between the system circuit breaker and a specific load, and a power supply device connected to a battery mounted on an electric vehicle, a system-side switcher is mounted between the system circuit breaker and the specific load. A vehicle-side switcher is mounted between a power supply device and a specific load. Then, on the basis of the power information, power supply from the system power to the specific load is stopped and power supply from the power supply device to the specific load is performed, or power supply from the system power to the specific load is stopped and power supply from the power supply device to the specific load is performed. And switching control is performed on the system side switcher and the vehicle side switcher.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a power supply system, and more particularly to a power supply system connected to a system power and a power supply device connected to a battery mounted on an electric vehicle.

[0002] In the past, as such a power supply system, a system provided with a power conditioner device and a charge / discharge device that charges and discharges a drive battery of an electric vehicle has been proposed (for example, refer to Patent Literature 1). In this system, if communication with the power conditioner device is normal, the charge / discharge device sends a meaning that a start instruction has been accepted to the power conditioner device, and continues to act in accordance with an action instruction, and if the power conditioner device is not powered, power discharged from the drive battery is supplied to the power conditioner device regardless of the action instruction. Thereby, it is possible to flexibly use the power accumulated in the electric vehicle at the time of a power failure.

[0003] PRIOR ART DOCUMENTS

[0004] Patent Literature 1: Japanese Patent Application Publication No. 2019-071721

[0005] In a power supply system capable of supplying power from a battery of an electric vehicle to a load, it is generally necessary to perform switching of power supply from a system power to a specific load and power supply from an electric vehicle to the specific load, and it is also necessary to consider a switch, an electric leakage countermeasure, and a complicated device structure. SUMMARY

[0006] The main object of the power supply system of the present disclosure is to automatically perform switching of power supply from a system power to a specific load and power supply from an electric vehicle to the specific load, and to achieve simplification of a device.

[0007] In order to achieve the above-mentioned main object, the power supply system of the present disclosure employs the following means.

[0008] The power supply system of the present disclosure is provided with a system breaker connected to a system power, a specific breaker installed between the system breaker and a specific load, and a power supply device connected to a battery mounted on an electric vehicle, characterized by being provided with a system-side switch installed between the system breaker and the specific load, a vehicle-side switch installed between the power supply device and the specific load, and a control device that, based on power information, performs switching control of the system-side switch and the vehicle-side switch to stop power supply from the system power to the specific load, perform power supply from the power supply device to the specific load, or stop power supply from the power supply device to the specific load, and perform power supply from the system power to the specific load.

[0009] In the power supply system of the present disclosure, a system breaker is connected to a system power, a specific breaker is installed between the system breaker and a specific load, and a power supply device is connected to a battery mounted on an electric vehicle. A system-side switch is installed between the system breaker and the specific load, and a vehicle-side switch is installed between the power supply device and the specific load. A control device performs switching control of the system-side switch and the vehicle-side switch based on power information, to stop power supply from the system power to the specific load and perform power supply from the power supply device to the specific load, or to stop power supply from the power supply device to the specific load and perform power supply from the system power to the specific load. Thus, switching between power supply from the system power to the specific load and power supply from the electric vehicle to the specific load can be automatically performed, and the device can be simplified. Here, the system breaker corresponds to a leakage breaker or an overcurrent breaker. The specific breaker corresponds to an overcurrent breaker connected to the specific load. The specific load corresponds to a general 100 V load.

[0010] In the power supply system of the present disclosure, the system-side switch can be installed between the system breaker and the specific breaker, and the vehicle-side switch can be installed between the power supply device and a power line connected between the system-side switch and the specific breaker. Alternatively, the system-side switch can be installed between the specific breaker and the specific load, and the vehicle-side switch can be installed between the power supply device and a power line connected between the system-side switch and the specific load.

[0011] In the power supply system of the present disclosure, when the cost of the system power is equal to or higher than the average cost per day, the system-side switch and the vehicle-side switch can be switched to a mode in which power supply from the system power to the specific load is stopped and power supply from the power supply device to the specific load is performed, and when the cost of the system power is lower than the average cost per day, the system-side switch and the vehicle-side switch can be switched to a mode in which the battery mounted on the electric vehicle is charged via the power supply device and power supply from the system power to the specific load is performed. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a schematic configuration diagram that shows the configuration of the power supply system 20 as one embodiment of the present disclosure.

[0013] Figure 2 is a flowchart that shows an example of the process performed when the electric vehicle is connected by the management device.

[0014] Figure 3 is a schematic configuration diagram that shows the configuration of the power supply system 20B as a modified example.

[0015] The reference signs are explained as follows.

[0016] 10 electric vehicle, 12 system electric power, 14 electric power exchange information center, 16 solar power generation device,

[0017] 20 electric power supply system, 22 circuit breaker, 24 each room circuit breaker device of high voltage system (200V system), 34 each room circuit breaker device of low voltage system (100V system), 36a-36n, 37 overcurrent circuit breaker, 38 circuit breaker side switch, 40 vehicle external power supply device, 42 vehicle side switch, 50 energy management device, 54 electric power conversion device, 62 load, 64a-64n load, 65 specific load. DETAILED DESCRIPTION

[0018] Next, a mode (embodiment) for implementing the present disclosure is described. Figure 1 is a schematic configuration view that shows a configuration of an electric power supply system 20 as one embodiment of the present disclosure. The electric power supply system 20 of the embodiment is configured to be connected with the system electric power 12 and the electric vehicle 10, for example, and is a system that supplies electric power from the system electric power 12 and the electric vehicle 10 to loads 62, 64a-64n, and a specific load 65 in each room of a general household. The electric power supply system 20 is provided with a circuit breaker 22 connected with the system electric power 12, each room circuit breaker device 24 of a high voltage system (200V system), each room circuit breaker device 34 of a low voltage system (100V system), a vehicle external power supply device 40 connected with a not-shown battery mounted on the electric vehicle 10, and an energy management device (hereinafter, referred to as "energy management device").

[0019] The circuit breaker 22 is configured as a leakage circuit breaker and an overcurrent circuit breaker, and distributes three-phase alternating current electric power from the system electric power 12 to the each room circuit breaker device 24 of the high voltage system (200V system) and the each room circuit breaker device 34 of the low voltage system (100V system).

[0020] The each room circuit breaker device 24 of the high voltage system (200V system) distributes supplied electric power to each room, and has a plurality of overcurrent circuit breakers not shown for each room. Further, electric power is supplied to the load 62 in each room.

[0021] The room breaker device 34 of the low voltage system (100V system) distributes the supplied power to each room, and has a plurality of overcurrent breakers 36a to 36n, 37 for each room. The specific load 65 is also a general load like the loads 64a to 64n of each room, but is different in name from the loads 64a to 64n of each room because it is a load capable of switching the supply of power from the system power 12 and the supply of power from the electric vehicle 10. The room breaker device 34 provides a breaker-side switch 38 between the breaker 22 of the power system of the specific load 65 and the overcurrent breaker 37. The breaker-side switch 38 is configured as an electromagnetic switch or a semiconductor switch.

[0022] The vehicle external power supply device 40 is configured as a power conversion device having an inverter and a DC / DC converter that converts direct current power from a not-shown battery mounted on the electric vehicle 10 into alternating current power of the low voltage system (100V system) and supplies it to the specific load 65, or converts alternating current power of the low voltage system (100V system) from the system power 12 into direct current power to charge the battery of the electric vehicle 10. The vehicle external power supply device 40 is connected to between the breaker-side switch 38 of the power system of the specific load 65 and the overcurrent breaker 37 via a vehicle-side switch 42. The vehicle-side switch 42 is also configured as an electromagnetic switch or a semiconductor switch like the breaker-side switch 38.

[0023] The energy management device 50 is configured of a microcomputer. The energy management device 50 communicates with the external power exchange information center 14 and acquires power exchange information. As the power exchange information, there are included the average transaction amount per 1 kW of the system power 12 for one day, the transaction amount per 1 kW of the system power 12 at the current time, and the like. The energy management device 50 outputs a drive control signal (on / off signal) to the breaker-side switch 38 and the vehicle-side switch 42.

[0024] The energy management device 50 communicates with the vehicle external power supply device 40.

[0025] Next, the operation of the thus-configured power supply system 20, and particularly the operation at the time of power supply to the specific load 65 when the electric vehicle 10 is connected, will be described. Figure 2 is a flowchart showing an example of the process executed by the energy management device 50 at the time of connection of the electric vehicle. This process is executed at the time of connection of the electric vehicle to the vehicle external power supply device 40.

[0026] When the electric vehicle connection time processing is executed, the management device 50 first turns on the breaker-side switch 38 (step S100), and acquires power exchange information from the power exchange information center 14 by communication (step S110). Next, based on the acquired power exchange information, it is determined whether or not the transaction amount per 1 kW at the current time point of the system power 12 is equal to or more than the average transaction amount per 1 kW of the system power 12 (step S120).

[0027] When it is determined in step S120 that the transaction amount per 1 kW at the current time of the system power 12 is equal to or more than the average transaction amount per 1 kW of the system power 12, the state of charge SOC of the battery mounted on the electric vehicle 10 is acquired (step S130), and it is determined whether or not the acquired state of charge SOC exceeds the state of charge SOC required for the scheduled travel of the electric vehicle 10 on the next day (step S140). The state of charge SOC required for the scheduled travel of the electric vehicle 10 on the next day can be, for example, calculated based on the travel history of each day in the past week to obtain the state of charge SOC required for the travel of the electric vehicle 10 each day and as a map, and if which day of the next day is given, the corresponding state of charge SOC required for the travel of the electric vehicle 10 can be derived from the map.

[0028] When it is determined in step S140 that the state of charge SOC exceeds the state of charge SOC required for the scheduled travel of the electric vehicle 10 on the next day, the vehicle-side switch 42 is turned on (step S150), and the breaker-side switch 38 is turned off (step S160), and the electric vehicle 10 is supplied with power to the specific load 65 (step S170). Then, it is determined whether or not the power supply is ended (step S180), and when it is determined that the power supply is not ended, the processing returns to step S130 of acquiring the state of charge SOC of the battery mounted on the electric vehicle 10. On the other hand, when it is determined in step S140 that the state of charge SOC does not exceed the state of charge SOC required for the scheduled travel of the electric vehicle 10 on the next day, the vehicle-side switch 42 is turned off (step S190), and the processing returns to step S100 of turning on the breaker-side switch 38. Therefore, when it is determined in step S120 that the transaction amount per 1 kW at the current time of the system power 12 is equal to or more than the average transaction amount per 1 kW of the system power 12 for one day, and it is determined in step S140 that the state of charge SOC exceeds the state of charge SOC required for the scheduled travel of the electric vehicle 10 on the next day, the power supply from the electric vehicle 10 to the specific load 65 is continued until the state of charge SOC no longer exceeds the state of charge SOC required for the scheduled travel of the electric vehicle 10 on the next day.

[0029] When it is determined in step S120 that the transaction amount per 1 kW at the current time of the system electric power 12 is less than the average transaction amount per 1 kW of the system electric power 12, the vehicle-side switch 42 is turned on (step S200), and charging of the battery mounted on the electric vehicle 10 is performed by electric power from the system electric power 12 (step S210). At this time, electric power from the system electric power 12 is supplied to the specific load 65. Then, it is determined whether or not the charging of the battery mounted on the electric vehicle 10 is completed (step S220), and when it is determined that the charging of the battery mounted on the electric vehicle 10 is not completed, the process returns to step S110 of acquiring the power exchange information from the power exchange information center 14. Therefore, during the period when the transaction amount per 1 kW at the current time of the system electric power 12 is less than the average transaction amount per 1 kW of the system electric power 12, the charging of the battery is continued until the charging of the battery mounted on the electric vehicle 10 is completed. When it is determined in step S220 that the charging of the battery mounted on the electric vehicle 10 is completed, the process returns to step S100 of turning on the breaker-side switch 38.

[0030] In the power supply system 20 of the above-described embodiment, the breaker-side switch 38 composed of an electromagnetic switch or a semiconductor switch is provided between the breaker 22 of the power system of the specific load 65 and the overcurrent breaker 37, and the vehicle-external power supply device 40 is connected via the vehicle-side switch 42 composed of an electromagnetic switch or a semiconductor switch between the breaker-side switch 38 of the power system of the specific load 65 and the overcurrent breaker 37. Further, the control device 50 turns on and off the breaker-side switch 38 and the vehicle-side switch 42 based on the power exchange information acquired from the power exchange information center 14, thereby supplying electric power from the system electric power 12 to the specific load 65 or supplying electric power from the electric vehicle 10 to the specific load 65. Thus, it is possible to automatically perform switching of the electric power supply from the system electric power 12 to the specific load 65 and the electric power supply from the electric vehicle 10 to the specific load 65, and it is possible to achieve simplification of the power supply system 20. Further, when the transaction amount per 1 kW at the current time of the system electric power 12 is less than the average transaction amount per 1 kW of the system electric power 12, the charging of the battery mounted on the electric vehicle 10 is performed by electric power from the system electric power 12, and thus it is possible to perform the charging of the battery at a low cost.

[0031] In the power supply system 20 of the embodiment, the circuit breaker side switch 38 is provided between the circuit breaker 22 of the power system of the specific load 65 and the overcurrent circuit breaker 37, and the vehicle external power supply device 40 is connected via the vehicle side switch 42 between the circuit breaker side switch 38 of the power system of the specific load 65 and the overcurrent circuit breaker 37. However, the circuit breaker side switch can also be provided between the overcurrent circuit breaker 37 of the power system of the specific load 65 and the specific load 65, and the vehicle external power supply device 40 can be connected via the vehicle side switch between the circuit breaker side switch of the power system of the specific load 65 and the specific load 65.

[0032] In the power supply system 20 of the embodiment, the power supply from the system power 12 and the power supply from the electric vehicle 10 are accepted, but the power supply from a solar power generation device can also be accepted in addition to the power supply from the system power 12 and the power supply from the electric vehicle 10. Figure 3 is a configuration diagram showing an example of the configuration of the power supply system 20B which is a modification example in which the power supply from the solar power generation device is also accepted. As shown in the drawing, the solar power generation device 16 is connected with the circuit breaker 22 via a power conversion device (PCS) 54. Thereby, the generated power of the solar power generation device 16 is supplied to the loads 64a to 64n of each room, the specific load 65 via each room circuit breaker device 24 of the high voltage system (200 V system), via the loads 62 of each room, each room circuit breaker device 34 of the low voltage system (100 V system). In addition, the power conversion device 54 is connected with the vehicle external power supply device 40 via a solar power generation side switch 56. Thereby, by turning on the solar power generation side switch 56, the electric vehicle 10 mounted battery can be charged with the generated power of the solar power generation device 16. In the power supply system 20B of such a modification example, the circuit breaker side switch 38 is also provided between the circuit breaker 22 of the power system of the specific load 65 and the overcurrent circuit breaker 37, and the vehicle external power supply device 40 is connected via the vehicle side switch 42 between the circuit breaker side switch 38 of the power system of the specific load 65 and the overcurrent circuit breaker 37, so the same effects as the power supply system 20 of the embodiment can be exerted.

[0033] The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem will be described. In the embodiment, the circuit breaker 22 corresponds to the "system circuit breaker", the specific load 65 corresponds to the "specific load", the overcurrent circuit breaker 37 corresponds to the "specific circuit breaker", the electric vehicle 10 corresponds to the "electric vehicle", the vehicle external power supply device 40 corresponds to the "power supply device", the circuit breaker side switch 38 corresponds to the "system side switch", the vehicle side switch 42 corresponds to the "vehicle side switch", and the management device 50 corresponds to the "control device".

[0034] Further, the correspondence relationship between the main elements of the embodiments and the main elements of the inventions described in the column of means for solving the problems is an example of a way of specifically describing the inventions described in the column of means for solving the problems, and thus does not limit the elements of the inventions described in the column of means for solving the problems. That is, the explanation of the inventions described in the column of means for solving the problems is made based on the description of the column, and the embodiments are merely a specific example of the inventions described in the column of means for solving the problems.

[0035] The present disclosure has been described using the embodiments above, but the present disclosure is not limited to such embodiments, and of course can be implemented in various ways within the scope of the gist of the present disclosure.

[0036] Industrial applicability

[0037] The present disclosure can be used in the manufacturing industry of power supply systems and the like.

Claims

1. A power supply system comprising: a system breaker connected to a system power; a specific breaker installed between the system breaker and a specific load; and a power supply device connected to a battery mounted on an electric vehicle, characterized in that the power supply system comprises: a system side switch installed between the system breaker and the specific load; a vehicle side switch installed between the power supply device and the specific load; and a control device that, based on power information, performs switching control of the system side switch and the vehicle side switch to stop power supply from the system power to the specific load, perform power supply from the power supply device to the specific load, or stop power supply from the power supply device to the specific load and perform power supply from the system power to the specific load. ​ ​ ​ ​ ​

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