Power supply system

Abstract

A controller of a power supply system according to the present invention executes a process including: a step of confirming a vehicle power supply voltage if there is a power supply stop command during power supply from a vehicle; a step of maintaining the on state of the second electromagnetic switch if the vehicle power supply voltage is greater than a threshold value (Va); and a step in which the first electromagnetic switch is turned on and the second electromagnetic switch is turned off when the vehicle power supply voltage is equal to or less than a threshold value (Va).

Description

Technical Field

[0001] This disclosure relates to power supply systems. Background Technology

[0002] In power supply systems capable of supplying electricity from the system power source to the electrical loads of a house, the primary function is to supply power from the vehicle to the electrical loads during emergencies (such as when the system power source fails or when the system power source is under strain). In addition, it is proposed to supply power from the vehicle to the electrical loads during normal times (such as during periods of high electricity costs from the system power source). Japanese Patent Application Publication No. 2019-71721 discloses a power supply system that can effectively utilize the electricity stored in an electric vehicle.

[0003] In the aforementioned power supply system, when the power supply is obstructed due to the connector connecting the vehicle and the electrical load becoming disconnected during power supply from the vehicle to the electrical load, the power supply to the electrical load may sometimes stop and become unsustainable. Summary of the Invention

[0004] The purpose of this disclosure is to provide a power supply system that can continue to supply power to electrical loads even when power supply from the vehicle is interrupted.

[0005] One aspect of this disclosure relates to a power supply system that supplies alternating current (AC) power from a system power source to the electrical loads of a house. The power supply system includes: a vehicle equipped with an energy storage device; a current circuit breaker that receives AC power from the system power source to the residence and disconnects it at least in the event of an overcurrent; a load circuit breaker configured to disconnect the current circuit breaker from the electrical load; a first switch configured to switch the electrical connection and disconnection between the current circuit breaker and the electrical load; a second switch configured to be provided on a power line branching from the power line between the first switch and the electrical load, and capable of switching the electrical connection and disconnection between the electrical load and the vehicle; and a control device that controls the operation of the first and second switches respectively. When a power supply stop command is received from the vehicle power supply, and the supply voltage from the vehicle falls below a threshold value, the control device switches the power supply source to the electrical load from the vehicle back to the system power source.

[0006] In this way, when a power supply stop command is received, and the power supply voltage from the vehicle falls below a threshold, the power supply source to the electrical load will be switched from the vehicle to the system power supply. Therefore, even in cases such as connector detachment, power can continue to be supplied to the electrical load.

[0007] The above and other objects, features, aspects and advantages of the present invention will become clear from the following detailed description relating to the invention, which is understood in conjunction with the accompanying drawings. Attached Figure Description

[0008] Figure 1 This is a diagram illustrating an example of the configuration of the power supply system involved in this embodiment.

[0009] Figure 2 This is a flowchart illustrating an example of the control process for an electromagnetic switch.

[0010] Figure 3 This is a flowchart illustrating an example of the control process of an electromagnetic switch in a power supply.

[0011] Figure 4 This is a diagram illustrating an example of the configuration of the power supply system involved in the variation.

[0012] Figure 5 This is a diagram illustrating another example of the configuration of the power supply system involved in the variation.

[0013] Figure 6 This is a flowchart illustrating an example of the control process of the electromagnetic switch involved in the modified example. Detailed Implementation

[0014] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Furthermore, the same or equivalent parts in the drawings will be labeled with the same reference numerals, and their descriptions will not be repeated.

[0015] Figure 1 This diagram illustrates an example of the configuration of the power supply system according to this embodiment. The power supply system 101 supplies power from the system power source 900 to the loads of the building 101A. The building 101A is typically a residential building such as a house. However, the building 101A may include non-residential buildings, towers, buildings for storing equipment, etc. The loads are various electrical devices, located inside (indoors) or outside (outdoors) of the building 101A.

[0016] The power supply system 101 includes a residual current circuit breaker (current circuit breaker) 1, overcurrent circuit breakers (load circuit breakers) 111~113, 211, 212, and a power supply device 3. The number of overcurrent circuit breakers is not particularly limited.

[0017] The residual current circuit breaker 1 receives AC power of 101A from the system power supply 900 to the house 1. Circuit breaker 1 is connected to a circuit (power line) PL1 for transmitting AC 100V and a circuit PL2 for transmitting AC 200V. When a leakage current or an overcurrent is detected, the residual current circuit breaker 1 disconnects the system power supply 900 from circuits PL1 and PL2. The residual current circuit breaker 1 is equivalent to a "current circuit breaker". The residual current circuit breaker 1 only needs to interrupt the current when an overcurrent is detected; an overcurrent circuit breaker can also be used instead of the residual current circuit breaker 1.

[0018] Overcurrent circuit breakers 111-113 are electrically connected to circuit PL1 for AC 100V. For example, house 101A includes multiple rooms, and loads 121, 122, and 123 are provided for each room. Overcurrent circuit breakers 111-113 are correspondingly provided for each room in house 101A. Overcurrent circuit breakers 111-113 are configured to electrically disconnect the residual current circuit breaker 1 from the loads 121-123 upon detection of an overcurrent. Overcurrent circuit breaker 113 is equivalent to a "load circuit breaker." Each load is equivalent to an "electrical load."

[0019] Overcurrent circuit breakers 211 and 212 are electrically connected to circuit PL2 for AC 200V. Overcurrent circuit breakers 211 and 212 are also installed in each room of house 101A. Overcurrent circuit breakers 211 and 212 are configured to electrically disconnect the residual current circuit breaker 1 from the loads 221 and 222 when an overcurrent is detected.

[0020] The power supply unit 3 is configured to connect to the vehicle 4 via a power supply cable and a connector 5. The vehicle 4 is an electric vehicle equipped with a driving energy storage device (battery) and capable of receiving and exchanging power with external sources; specifically, it is a battery electric vehicle (BEV) or a plug-in hybrid electric vehicle (PHEV). The vehicle 4 also includes a power conversion device that converts the DC power from the energy storage device into AC power. The power supply unit 3 is configured to, when connected to the vehicle 4, supply AC power from the vehicle 4 to a load (in this example, load 123) and then stop supplying power, according to control commands from the controller 10.

[0021] The power supply system 101 also includes a controller (control device) 10, a first electromagnetic switch (first switch) 51 and a second electromagnetic switch (second switch) 52.

[0022] The first electromagnetic switch 51 is configured to switch the electrical connection and disconnection between the residual current circuit breaker 1 and the load 123. Specifically, the first terminal of the first electromagnetic switch 51 is electrically connected to the AC 100V circuit PL1. The second terminal of the first electromagnetic switch 51 is electrically connected to the overcurrent circuit breaker 113. The first electromagnetic switch 51 is configured to switch the electrical connection and disconnection between the residual current circuit breaker 1 and the overcurrent circuit breaker 113 according to control commands from the controller 10.

[0023] The second electromagnetic switch 52 is configured to be installed on a power line branching from the power line between the first electromagnetic switch 51 and the overcurrent circuit breaker 113, and is capable of switching the electrical connection and disconnection between the load 123 and the vehicle 4. Specifically, the first end of the second electromagnetic switch 52 is electrically connected to a connection node 54 located between the second end of the first electromagnetic switch 51 and the overcurrent circuit breaker 113. The second end of the second electromagnetic switch 52 is electrically connected to the power supply device 3. Thus, the second electromagnetic switch 52 is configured to switch the electrical connection and disconnection between the connection node 54 and the power supply device 3 according to control commands from the controller 10. Both electromagnetic switches are collectively referred to as "electromagnetic switches".

[0024] Controller 10 is a computer device including processor 11 and memory 12, such as a HEMS (Home Energy Management System) controller. Controller 10 outputs control commands to open and close (switch on / off) the first electromagnetic switch 51 and the second electromagnetic switch 52 respectively. Controller 10 can also obtain power information (power transaction information, electricity bill information, etc.) of the system power supply 900 from an energy management server (not shown), and open and close the first electromagnetic switch 51 and the second electromagnetic switch 52 and control the power supply device 3 (i.e., power supply from vehicle 4) according to the obtained power information. Controller 10 is equivalent to a "control device".

[0025] The voltage measuring unit 13 measures, for example, the voltage of the power supplied between the system power supply 900 and the residual current circuit breaker 1, and the voltage of the power supplied from the power supply device 3 between the vehicle 4 and the second electromagnetic switch 52, and sends the measurement results to the controller 10. The voltage measuring unit 13 measures voltage and sends the absolute value of the measured voltage to the controller 10 as the measurement result.

[0026] Since the phases differ between the AC power supplied from the system power supply 900 and the AC power supplied from the vehicle 4, the first electromagnetic switch 51 and the second electromagnetic switch 52 are used to select which of the two AC powers is supplied to the loads 121-123.

[0027] Figure 2This is a flowchart illustrating an example of the control process for an electromagnetic switch. It executes when predetermined conditions are met (e.g., at specified intervals). Figure 2 The process is illustrated. Each step is implemented through software processing by the controller 10 (processor 11), but it can also be implemented through hardware (circuit) configured within the controller 10. Imagine that at the start of a series of processes, the first electromagnetic switch 51 is turned on (closed), and the second electromagnetic switch 52 is turned off (open circuit).

[0028] In step (hereinafter referred to as S) 100, the controller 10 determines whether the power supply device 3 is connected to the vehicle 4. If the power supply device 3 is connected to the vehicle 4 (yes in S100), the process moves to S101. If the power supply device 3 is not connected to the vehicle 4 (no in S100), the process ends.

[0029] In S101, the controller 10 obtains power information of the system power supply 900 (in this case, current electricity bill information) from the energy management server, for example.

[0030] In S102, controller 10 determines whether the current electricity charge obtained in S101 is higher than the base price (e.g., the average price of electricity for the day). If the current electricity charge is higher than the base price (yes in S102), the process moves to S103.

[0031] In S103, the controller 10 obtains the State of Charge (SOC) of the battery installed in the vehicle 4 through communication with the vehicle 4. Furthermore, in the vehicle 4, the SOC is estimated using various known methods, such as methods based on current accumulation (coulomb counting) or estimation based on open circuit voltage (OCV), for example, by using the detected values ​​of the battery's current, voltage, and temperature.

[0032] In S104, the controller 10 determines whether the obtained SOC is higher than the required value. The required value is, for example, a value corresponding to the electrical power required for the vehicle 4 to operate the following day. The required value can be a predetermined fixed value or a variable value determined based on the actual usage performance of the vehicle 4. If the SOC is higher than the required value (yes in S104), the process moves to S105.

[0033] In S105, controller 10 obtains information about the electricity cost when vehicle 4 was last charged from the energy management server. Then, processing proceeds to S106.

[0034] In S106, the controller 10 calculates the difference between the current electricity cost obtained in S101 and the electricity cost at the time of the last charge obtained in S105, and determines whether the difference is greater than or equal to a threshold α. If the difference is greater than the threshold α (yes in S106), the process moves to S107. If the difference is less than or equal to the threshold α (no in S106), the process moves to S109. Furthermore, in this embodiment, the threshold α is a positive value, but it can also be 0. Additionally, this embodiment shows an example of calculating the difference, but it is also possible to replace the difference by, for example, determining whether the ratio (b / a) of the electricity cost b at the time of charging to the current electricity cost a is greater than or equal to the threshold α. The threshold α can also be set, for example, to the point at which the user can obtain benefits.

[0035] In addition, in S105, information on the electricity cost at the time of the last charge is obtained, but for example, if the vehicle 4 has accumulated electricity through multiple past charges, information on the average of the electricity costs from those multiple charges can also be obtained.

[0036] In S107, the controller 10 disconnects the first electromagnetic switch 51 and connects the second electromagnetic switch 52. Then, the process proceeds to S108.

[0037] In S108, the controller 10 controls the power supply device 3 to begin supplying power from the vehicle 4 to the load 123. Afterwards, the process returns to S103. Furthermore, if power supply from the vehicle 4 continues, the State of Charge (SOC) decreases over time. Therefore, if the SOC falls below the desired value (which is not the case in S104), the process moves to S109.

[0038] In S109, controller 10 controls power supply device 3 to terminate power supply from vehicle 4 to load 123. Then, processing moves to S110.

[0039] In S110, the controller 10 turns on the first electromagnetic switch 51 and turns off the second electromagnetic switch 52. The process then ends. Furthermore, if a charging device is further provided, the charging device can be controlled to charge the battery storage device mounted on the vehicle 4 when the electricity price is below the base price (not in S102) (S111, S112).

[0040] exist Figure 2The example described illustrates how processing can be changed based on whether the electricity price exceeds the benchmark price. Alternatively, controller 10 can switch processing based on whether it is currently a nighttime period (the period during which nighttime charges apply). This also saves on electricity costs. Alternatively, controller 10 can switch processing based on whether the current period is a peak time for electricity demand in house 101A. By supplying power from vehicle 4 during peak electricity demand periods, even if the maximum supply current from system power source 900 is low, the peak electricity demand can be supplied, thus reducing the so-called contract amperage. Therefore, electricity costs can be saved.

[0041] In the power supply system 101 with the above configuration, for example, when the first electromagnetic switch 51 is in the off state and the second electromagnetic switch 52 is in the on state, power is supplied from the vehicle 4 to the load 123. At this time, if the connector 5 falls off the plug of the vehicle 4, power supply to the load 123 may sometimes stop, and power supply cannot continue.

[0042] Therefore, in this embodiment, when a power supply stop command is received from the power supply of vehicle 4, and the power supply voltage from vehicle 4 becomes below a threshold, the controller 10 switches the power supply source to load 123 from vehicle 4 to system power supply 900.

[0043] In this way, if the connector 5 falls off the socket of the vehicle 4 and a power supply stop command is received from the vehicle 4 to the controller 10, when the power supply voltage from the vehicle 4 becomes below the threshold, the power supply source to the load 123 will be switched from the vehicle 4 to the system power supply 900, so that power supply to the load 123 can continue.

[0044] The following is for reference Figure 3 An example of the processing of the electromagnetic switch in the control power supply executed by the controller 10 in this embodiment will be described. Figure 3 This is a flowchart illustrating an example of the control process of an electromagnetic switch in power supply. The flowchart shows a series of processes that are repeatedly executed at predetermined intervals. For this series of processes, since it is envisioned that in the process of supplying power from vehicle 4 to load 123, the case is envisioned that the first electromagnetic switch 51 is opened (open circuit) and the second electromagnetic switch 52 is turned on (closed).

[0045] In S150, the controller 10 determines whether power is being supplied. The controller 10 may, for example, use the measurement results from the voltage measuring unit 13 to determine whether power is being supplied from the vehicle 4 to the load 123. For example, if the voltage measuring unit 13 measures that no power is being supplied from the residual current circuit breaker 1 to the system power supply 900 (current is not flowing) and measures that power is being supplied from the vehicle 4 to the second electromagnetic switch 52 (current is flowing), the controller 10 may also determine that power is being supplied from the vehicle 4 to the load 123. If it is determined that power is being supplied (yes in S150), the process proceeds to S152.

[0046] In S152, the controller 10 determines whether a power supply stop command exists. For example, if a power supply stop command is received from vehicle 4, the controller 10 determines that a power supply stop command exists. In vehicle 4, for example, when connector 5 is disconnected from the socket of vehicle 4 during power supply, connector 5 is removed from the socket of vehicle 4, or the user of vehicle 4 accepts an operation to stop power supply and disconnects connector 5, a power supply stop command is sent to the controller 10. For vehicle 4 (specifically, the vehicle's control device), for example, it may also be determined that connector 5 is removed from the socket when the signal from a switch (not shown) that outputs an on signal when connector 5 is installed is switched to an off signal. If a power supply stop command is determined to exist (yes in S152), the process proceeds to S154.

[0047] In S154, the controller 10 confirms the vehicle power supply voltage. The controller 10 uses the measurement result from the voltage measuring unit 13 to obtain the voltage supplied from the vehicle 4 (vehicle power supply voltage). Thereafter, the process moves to S156.

[0048] In S156, controller 10 determines whether the vehicle supply voltage is greater than a threshold Va. The threshold Va can be any value that indicates the power supply has stopped; alternatively, it can be a predetermined value and is not particularly limited, for example, it can be zero. If it is determined that the vehicle supply voltage is greater than the threshold Va (yes in S156), the process proceeds to S158.

[0049] In S158, the controller 10 maintains the second electromagnetic switch 52 in the on state. At this time, the controller 10 also maintains the first electromagnetic switch 51 in the off state. Therefore, power supply from the vehicle 4 to the load 123 continues. Then, the process returns to S154. On the other hand, if it is determined that the vehicle power supply voltage is below the threshold Va (not in S156), the process moves to S160.

[0050] In step S160, the controller 10 controls the first electromagnetic switch 51 and the second electromagnetic switch 52, causing the first electromagnetic switch 51 to be in the ON state and the second electromagnetic switch 52 to be in the OFF state. Then, the process ends.

[0051] The operation of the power supply system 101 according to this embodiment based on the above-described structure and flowchart will be explained. For example, consider the case where the connector 5 is connected to the socket of the vehicle 4 and supplies power from the battery of the vehicle 4 to the load 123 via the power supply device 3, the second electromagnetic switch 52, and the overcurrent circuit breaker 113.

[0052] If it is determined that power is being supplied (yes in S150), the controller 10 determines whether a power supply stop command exists (S152). With the connector 5 installed in the socket removed, the vehicle 4 outputs a power supply stop command to the controller 10. If a power supply stop command exists (yes in S152), the vehicle power supply voltage is obtained (S154). If it is determined that the obtained vehicle power supply voltage is greater than the threshold Va (yes in S156), the second electromagnetic switch 52 is maintained in the on state (S158). On the other hand, if it is determined that the vehicle power supply voltage is below the threshold Va (no in S156), the first electromagnetic switch 51 is switched from the off state to the on state, and the second electromagnetic switch 52 is switched from the on state to the off state (S160).

[0053] Therefore, AC power from the system power supply 900 is supplied to the load 123 via the residual current circuit breaker 1, the first electromagnetic switch 51, and the overcurrent circuit breaker 113. Thus, power supply to the load 123 continues.

[0054] As described above, according to the power supply system 101 of this embodiment, when a power supply stop command is received from the vehicle 4 to the controller 10 due to the connector 5 detaching from the vehicle 4's socket, the power supply source to the load 123 is switched from the vehicle 4 to the system power supply 900 when the power supply voltage from the vehicle 4 falls below a threshold value, thus enabling continued power supply to the load 123. Therefore, a power supply system that does not stop supplying power to the electrical load even when power supply from the vehicle is blocked can be provided.

[0055] Furthermore, in this embodiment, by using the first electromagnetic switch 51 and the second electromagnetic switch 52, it is possible to select whether to supply AC power from the system power supply 900 or AC power from the vehicle 4 to the loads 121-123. More specifically, AC power from the system power supply 900 is selected by turning on the first electromagnetic switch 51 and turning off the second electromagnetic switch 52. On the other hand, AC power from the vehicle 4 is selected by turning off the first electromagnetic switch 51 and turning on the second electromagnetic switch 52. Therefore, according to this embodiment, it is possible to selectively supply power from the vehicle 4 and power from the system power supply 900 to the load 123 using two electromagnetic switches and with a simple system configuration.

[0056] The following is an explanation of the variations.

[0057] In the above embodiments, the case where the vehicle 4 includes a power conversion device that converts the DC power of the vehicle 4's energy storage device into AC power will be described. However, the power supply device 3 may also convert the DC power of the vehicle 4's energy storage device into AC power.

[0058] Furthermore, in the above embodiment, the configuration in which the first electromagnetic switch 51 is connected between the residual current circuit breaker 1 and the overcurrent circuit breaker 113 has been described as an example, but it is not particularly limited to such a configuration. For example, the first electromagnetic switch 51 may also be configured to be connected between the overcurrent circuit breaker 113 and the load 123.

[0059] Figure 4 This is a diagram illustrating an example of the configuration of the power supply system 101 involved in the modified example. Figure 4 The configuration of the power supply system 101 shown is similar to Figure 1 The difference between the power supply system 101 shown and the one described is that the first electromagnetic switch 51 is disposed between the overcurrent circuit breaker 113 and the load 123, and the first end of the second electromagnetic switch 52 is connected to the connection node 54 disposed between the first electromagnetic switch 51 and the load 123. The rest of the configuration is the same, therefore, detailed descriptions will not be repeated except as described below. Figure 4As shown, a first electromagnetic switch 51 can also be provided between the overcurrent circuit breaker 113 and the load 123. The first end of the first electromagnetic switch 51 is connected to the overcurrent circuit breaker 113, and the second end of the second electromagnetic switch 52 is connected to the load 123. Furthermore, the connection node 54 between the second end of the first electromagnetic switch 51 and the load 123 can also be connected to the first end of the second electromagnetic switch 52. Even so, when a power supply stop command is received from the power supply of the vehicle 4, and the vehicle power supply voltage falls below the threshold Va, the power supply source to the load 123 will be switched from the vehicle 4 to the system power supply 900, thus allowing continued power supply to the load 123.

[0060] Furthermore, in the above embodiments, the power supply system 101 may also include a solar power generation device as a power source.

[0061] Figure 5 This is a diagram illustrating another example of the configuration of the power supply system 101 involved in the modified example. Figure 5 The power supply system 101 shown is Figure 1 The power supply system 101 shown differs from the power supply system 101 in that it also includes a charging device 6, a power conditioner (PCS) 7, a solar power generation device 8, and a third electromagnetic switch (third switch) 53. Other than these, the configuration is the same as described below. Figure 1 The power supply system 101 shown has the same configuration, so its detailed description will not be repeated.

[0062] like Figure 5 As shown, the first terminal of the third electromagnetic switch 53 is electrically connected to the power regulator 7. The second terminal of the third electromagnetic switch 53 is electrically connected to the charging device 6. The third electromagnetic switch 53 is configured to switch the electrical connection and disconnection between the power regulator 7 and the charging device 6 according to the control command from the controller 10.

[0063] The charging device 6 is configured to connect to the vehicle 4 via a charging cable (not shown) (which may also be shared with the power supply cable). The charging device 6 is configured to charge the vehicle 4 using AC power from the power regulator 7 when connected to the vehicle 4. The conversion from AC power to DC power can be performed either in the charging device 6 or in the vehicle 4.

[0064] The power regulator 7 receives DC power from the solar power generation device 8 and converts it into AC power. The power regulator 7 outputs the AC power to the residual current circuit breaker 1 and to the charging device 6 via the third electromagnetic switch 53.

[0065] Figure 6This is a flowchart illustrating an example of the control process of the electromagnetic switch involved in the modified example. It is assumed that at the start of a series of processes, the first electromagnetic switch 51 is turned on, the second electromagnetic switch 52 is turned off, and the third electromagnetic switch 53 is turned off.

[0066] In S200, the controller 10 determines whether the power supply device 3 and the charging device 6 are connected to the vehicle 4. If the power supply device 3 and the charging device 6 are connected to the vehicle 4 (yes in S200), the process moves to S201. If the power supply device 3 and the charging device 6 are not connected to the vehicle 4 (no in S200), the process ends. Alternatively, the process in S200 can be omitted.

[0067] In S201, the controller 10 obtains information related to the power generated by the solar power generation device 8, and information related to the power consumed (load power) of each load within the house 101A. The controller 10 determines whether the power generated (power output) within a specified time period is greater than the power consumed (load) within the same specified time period. If the power output is greater than the load (yes in S201), the process proceeds to S202.

[0068] In S202, the controller 10 determines whether the power generation of the solar power generation device 8 exceeds a predetermined amount. The predetermined amount is defined as sufficient electricity to charge the vehicle 4. If the power generation exceeds the predetermined amount (yes in S202), the process proceeds to S203.

[0069] In S203, the controller 10 determines whether the SOC of the vehicle 4 is higher than the required value. As described above, the required value can be determined as the value corresponding to the electrical power required for the vehicle 4 to drive the next day. If the SOC is higher than the required value (yes in S203), that is, if the power generated by the solar power generation device 8 is sufficient to charge the vehicle 4, but the vehicle 4 has already accumulated the electrical power required for driving, the process moves to S204.

[0070] In S204, the controller 10 turns on the first electromagnetic switch 51, turns off the second electromagnetic switch 52, and turns off the third electromagnetic switch 53. Afterward, the process ends. At this time, neither the power supply to the vehicle 4 nor the charging of the vehicle 4 takes place. Alternating current from the system power supply 900 or power generated by the solar power generation device 8 (AC-converted power) is supplied to the load 123. If the SOC is below the desired value (not in S203), that is, if the power generated by the solar power generation device 8 is sufficient to charge the vehicle 4 but the electrical power stored in the vehicle 4 is insufficient, the process moves to S205.

[0071] In S205, the controller 10 turns on the first electromagnetic switch 51, turns off the second electromagnetic switch 52, and turns on the third electromagnetic switch 53. The process then ends. At this time, the vehicle 4 is charged using the electricity generated by the solar power generation device 8. The system power supply 900 or the electricity from the solar power generation device 8 is supplied to the load 123. Furthermore, if the power generation of the solar power generation device 8 is below a predetermined amount (not in S202), that is, if the power generation is greater than the load but insufficient to charge the vehicle 4, the process proceeds to S206.

[0072] In S206, the controller 10 turns on the first electromagnetic switch 51, turns off the second electromagnetic switch 52, and turns off the third electromagnetic switch 53 (S206). At this time, neither the power supply from the vehicle 4 nor the charging of the vehicle 4 is performed. The load 123 is supplied with AC power from the system power supply 900 or the power generated by the solar power generation device 8. Furthermore, if the power generation of the solar power generation device 8 is less than the load capacity (not in S201), that is, if the power demand of the house 101A cannot be met by the solar power generation device 8 alone, the process is moved to S207.

[0073] In S207, the controller 10 determines whether the State of Charge (SOC) of vehicle 4 is higher than the required value. The required value can be the same as the required value in S203, or it can be a different value. If the SOC is higher than the required value (yes in S207), that is, if there is excess electrical power stored in vehicle 4, the process moves to S208. If the SOC is lower than the required value (no in S207), the process moves to S211.

[0074] In S208, controller 10 obtains, for example, information about the electricity cost when vehicle 4 was last charged from the energy management server. Then, processing proceeds to S209.

[0075] In S209, the controller 10 calculates the difference between the current electricity cost and the electricity cost at the time of the last charge, for which information was obtained in S208, and determines whether the difference is greater than or equal to a threshold α. If the difference is greater than the threshold α (yes in S209), the process moves to S210. If the difference is less than the threshold α (no in S209), the process moves to S213. Furthermore, in S209, a comparison is performed with... Figure 3 The process is the same as S106, so detailed explanation is omitted.

[0076] In S210, the controller 10 disconnects the first electromagnetic switch 51, connects the second electromagnetic switch 52, and disconnects the third electromagnetic switch 53. That is, power is supplied from the vehicle 4 to the load 123 instead of from the system power supply 900. Furthermore, if the SOC is below the desired value (not in S207), that is, if the electrical power stored in the vehicle 4 is not sufficient to supply power to the outside, the process is moved to S211.

[0077] In S211, the controller 10 determines whether there is a charging command from the vehicle 4 (S211). If there is a charging command (yes in S211), the process moves to S212.

[0078] In S212, the controller 10 turns on the first electromagnetic switch 51, turns off the second electromagnetic switch 52, and turns on the third electromagnetic switch 53. At this time, the vehicle 4 is charged using the power generated by the solar power generation device 8. Alternating current from the system power supply 900 or the power generated by the solar power generation device 8 is supplied to the load 123. If there is no charging command (not in S211), the process proceeds to S213.

[0079] In S213, the controller 10 turns on the first electromagnetic switch 51, turns off the second electromagnetic switch 52, and turns off the third electromagnetic switch 53 (S213). At this time, neither the power supply to the vehicle 4 nor the charging of the vehicle 4 is performed.

[0080] In this modified example, similar to the embodiment described above, the power supply system 101 includes a first electromagnetic switch 51, a second electromagnetic switch 52, and a third electromagnetic switch 53. Thus, with this simple system configuration that only adds a third electromagnetic switch, the vehicle 4 can be charged using power generated by the solar power generation device 8, in addition to the power supplied from the vehicle 4.

[0081] Furthermore, in the above embodiment, the configuration of setting the first electromagnetic switch 51 between the circuit PL1 and the overcurrent circuit breaker 113 was described as an example, but it can also be set on the circuit PL1 at a position closer to the leakage circuit breaker 1 than the branch point of the overcurrent circuit breaker 111.

[0082] Embodiments of the present invention have been described, but all points of the embodiments disclosed herein should be considered illustrative and not intended to limit the invention. The scope of the invention is defined by the technical solutions and is intended to include equivalents and all modifications within that scope.

Claims

1. A power supply system that supplies AC power from a system power source to the electrical loads of a building, characterized in that, The power supply system has the following features: The vehicle is equipped with an energy storage device; A current circuit breaker that receives AC power from the system power supply to the house and disconnects it at least in the event of an overcurrent. A load circuit breaker configured to electrically disconnect the current circuit breaker from the electrical load; The first switch is configured to switch the electrical connection and disconnection between the current circuit breaker and the electrical load. The second switch is configured to be located on a power line branching from the power line between the first switch and the power load, and is capable of switching the electrical connection and disconnection between the power load and the vehicle. as well as The control device controls the operation of the first switch and the second switch respectively. When a power supply stop command is received from the vehicle power supply, and the power supply voltage from the vehicle falls below a threshold, the control device will switch the power supply source to the electrical load from the vehicle to the system power supply.

2. The power supply system according to claim 1, characterized in that, In at least one of the following situations, namely, disconnecting the vehicle from the second switch or receiving an operation to stop the power supply, the vehicle sends the power supply stop command to the control device.

3. The power supply system according to claim 1, characterized in that, The control device is configured as follows: When power is supplied from the system power source to the electrical load, the first switch is closed and the second switch is opened. When power is supplied from the vehicle to the electrical load, the first switch is opened and the second switch is closed.

4. The power supply system according to claim 1, characterized in that, The house includes a power regulator that receives electricity generated by a solar power system. The power regulator is configured to supply AC power to the vehicle when it is connected. The power supply system also includes a third switch configured to switch the electrical connection and disconnection between the power regulator and the vehicle.

5. The power supply system according to claim 4, characterized in that, The control device is configured as follows: When power is supplied from the vehicle, the first switch is opened, the second switch is closed, and the third switch is opened. When charging the vehicle, the first switch is closed, the second switch is opened, and the third switch is closed. When neither power is supplied to the vehicle nor charging the vehicle is performed, the first switch is closed, the second switch is opened, and the third switch is opened.

6. The power supply system according to claim 1, characterized in that, When the vehicle is connected to the second switch and the current electricity cost is higher than the cost of supplying the vehicle with the current charging power, the control device opens the first switch and closes the second switch.

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