Vehicle charging / discharging device and power supply system

Abstract

To provide a charging / discharging device for a vehicle capable of surely performing operation requiring a continuous state of communication with the vehicle.SOLUTION: A vehicle charging / discharging device 100 includes: a connector 120 connected to a vehicle on which a storage battery is mounted; a power conversion unit 130 that performs charging operation or discharging operation relative to the storage battery; a power conversion control unit 141 that controls the power conversion unit 130; and a communication control unit 142 that controls communication with the vehicle. The communication control unit 142 maintains communication in an on state until preset set time elapses even when a charging rate of the storage battery is lower than a minimum charging rate. The power conversion control unit 141 performs automatic charging control of causing the power conversion unit 130 to perform charging operation such that a charging rate becomes equal to or higher than the minimum charging rate until the set time elapses after the charging rate becomes lower than the minimum charging rate.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a vehicle charging and discharging device and a power system.

Background Art

[0002] As a conventional power system, for example, the system described in Patent Document 1 is known. In the system described in Patent Document 1, a charge and discharge control device that controls the charge and discharge of a storage battery acquires the charge rate of the storage battery, and performs forced charging of the storage battery when the charge rate is equal to or less than the remaining amount threshold and the charging current is insufficient. Thereby, it is possible to avoid the charge and discharge stop (operation stop) of the charge and discharge control device due to insufficient charge amount (insufficient operating power) of the storage battery.

[0003] Further, as a vehicle charging and discharging device that charges and discharges an in-vehicle storage battery mounted on a vehicle, that is, a V2H (Vehicle to Home) device, one that operates in cooperation with a power conditioner of a solar power generation device (PV) is known. Such a vehicle charging and discharging device performs, for example, PV surplus power charging operation or green operation using the generated power of the solar power generation device.

[0004] During the PV surplus power charging operation, when the AC generated power of the solar power generation device output from the power conditioner (power obtained by converting DC generated power into AC) exceeds the power consumption of the household load (power load), the vehicle charging and discharging device charges the in-vehicle storage battery using the surplus power obtained by subtracting the power consumption from the AC generated power. During the green operation, when the AC generated power exceeds the power consumption, the vehicle charging and discharging device charges the in-vehicle storage battery using the surplus power. On the other hand, when the AC generated power is less than the power consumption, the vehicle charging and discharging device discharges the in-vehicle storage battery so as not to supply power from the power grid (not to purchase electricity). For the PV surplus power charging operation and the green operation, it is necessary for the vehicle charging and discharging device to maintain a state (for example, a standby state) in which communication with the vehicle (for example, communication defined by the CHAdeMO standard) is continued until the start of operation.

[0005] In the V2H guidelines defined by the CHAdeMO standard, during the charge / discharge mode, when the state where the charge rate of the in-vehicle battery falls below the minimum charge rate and the charge current value to the in-vehicle battery is less than the minimum current value indicated by the vehicle continues for 5 seconds or more, the vehicle charge / discharge device is stipulated to stop communication with the vehicle. Therefore, when the vehicle charge / discharge device performs PV surplus power charging operation and / or green operation, it is necessary to charge the in-vehicle battery so that the charge rate of at least the in-vehicle battery is equal to or higher than the minimum charge rate, so that the communication with the vehicle does not stop.

[0006] However, the minimum charge rate is set to different values depending on the vehicle type. For example, for a certain vehicle type, the minimum charge rate is set to 0%, and for another vehicle type, the minimum charge rate is set to 40%. Also, since the minimum charge rate can be updated at any time on the vehicle side, the minimum charge rate may change depending on the state of the vehicle. Therefore, in the vehicle charge / discharge device, if the minimum charge rate is set as a fixed value like the remaining amount threshold described in Patent Document 1, there is a possibility that the charge rate may fall below the minimum charge rate depending on the vehicle type and the state of the vehicle.

[0007] When the state where the charge rate is lower than the minimum charge rate and the charge current value is lower than the minimum current value continues for 5 seconds or more, the vehicle charge / discharge device stops communication with the vehicle. Therefore, if the user does not notice this, the PV surplus power charging operation and / or green operation may not be performed in the vehicle charge / discharge device. In this case, there is a problem that the user cannot drive the vehicle due to insufficient power of the in-vehicle battery. Furthermore, in this case, although surplus power is being generated, the surplus power cannot be charged to the in-vehicle battery, resulting in a problem that the power saving effect that should be obtained is impaired.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] The present invention has been made in view of the above circumstances, and an object thereof is to provide a vehicle charging / discharging device and a power supply system capable of surely performing an operation that requires continuous communication with a vehicle.

Means for Solving the Problems

[0010] In order to solve the above problems, a vehicle charging / discharging device according to the present invention includes a connector connected to a vehicle equipped with a storage battery, a power conversion unit that performs a charging operation or a discharging operation on the storage battery, a power conversion control unit that controls the power conversion unit, a communication control unit that controls communication with the vehicle, and is a vehicle charging / discharging device comprising wherein the communication control unit keeps the communication in an on state until a preset set time elapses even when the charge rate of the storage battery is lower than the minimum charge rate, and the power conversion control unit performs automatic charge control to cause the power conversion unit to perform a charging operation so that the charge rate becomes equal to or higher than the minimum charge rate before the set time elapses after the charge rate drops below the minimum charge rate.

[0011] In this configuration, when the charge rate is lower than the minimum charge rate, the power conversion control unit performs automatic charge control to cause the power conversion unit to output a charging current equal to or higher than the minimum current value indicated by the vehicle (using grid power for the shortage) so that the charge rate becomes equal to or higher than the minimum charge rate before a preset set time (for example, up to 5 seconds at maximum) elapses. Therefore, according to this configuration, communication with the vehicle is maintained in a continuous state (for example, a standby state), so that an operation that requires this continuous state can be surely performed.

[0012] The vehicle charging / discharging device The user further includes a setting unit capable of setting the minimum charge rate, The communication control unit, Performs an acquisition process of acquiring the charge rate and the minimum charge rate from the vehicle, The power conversion control unit, The automatic charge control can be configured to be performed using the first minimum charge rate that is the minimum charge rate set by the setting unit or the second minimum charge rate that is the minimum charge rate acquired by the acquisition process.

[0013] In the vehicle charging and discharging device, The power conversion control unit, Performs a comparison process of comparing the charge threshold set to a value equal to or higher than the minimum charge rate with the charge rate, and when the charge rate is lower than the charge threshold, performs the automatic charge control so that the charge rate becomes equal to or higher than the charge threshold, The setting unit, Can be configured to set the first minimum charge rate as the charge threshold, or to set a value obtained by adding a predetermined value to the second minimum charge rate as the charge threshold.

[0014] In order to solve the above problems, a power supply system according to the present invention includes, A vehicle charging and discharging device, A distribution board connected to an electric power load and an electric power system, A power conditioner connected to a power generation device and supplying the generated power of the power generation device to the vehicle charging and discharging device and / or the electric power load, A power supply system comprising: The vehicle charging and discharging device, A connector connected to a vehicle equipped with a storage battery, A power conversion unit that performs a charging operation or a discharging operation on the storage battery, A power conversion control unit that controls the power conversion unit, A communication control unit that controls communication with the vehicle, Comprises, The communication control unit, Even when the charge rate of the storage battery is lower than the minimum charge rate, the communication is kept on until a preset time elapses. The power conversion control unit is characterized by performing automatic charge control to cause the power conversion unit to perform a charging operation so that the charge rate becomes equal to or higher than the minimum charge rate from when the charge rate drops below the minimum charge rate until the preset time elapses.

[0015] In the power supply system the power conditioner converts the generated power into AC generated power and supplies the AC generated power to the vehicle charging / discharging device and / or the power load via the distribution board. The power conversion unit when the AC generated power exceeds the power consumption of the power load, performs a first operation of performing the charging operation using the surplus power obtained by subtracting the power consumption from the AC generated power, when the AC generated power exceeds the power consumption, performs the charging operation using the surplus power, and when the AC generated power is less than the power consumption, performs a second operation of performing the discharging operation so as to reduce the system power supplied from the power system to the power load. performs The power conversion control unit can be configured to perform the automatic charge control when the power conversion unit performs the first operation or the second operation.

Advantages of the Invention

[0016] According to the present invention, it is possible to provide a vehicle charging / discharging device and a power supply system that can surely perform an operation that requires continuous communication with a vehicle.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0018] Hereinafter, embodiments of the vehicle charging and discharging device and the power system according to the present invention will be described with reference to the accompanying drawings.

[0019] FIG. 1 shows a power system 1 according to an embodiment of the present invention. The power system 1 is a system that transmits electric power among a solar power generation device 2 corresponding to the "power generation device" of the present invention, a power grid 3, an electric power load 4, and a vehicle 5.

[0020] The power system 1 is composed of a vehicle charging and discharging device 100, a power conditioner 200, and a distribution board 300. Each component of the power system 1 will be described later.

[0021] The solar power generation device 2 is a device that generates electricity using solar energy, for example, a solar panel composed of solar cells. The solar power generation device 2 is connected to the power conditioner 200 and inputs DC generated power to the power conditioner 200.

[0022] The power grid 3 is an AC power source. For example, it is connected to the distribution board 300 via a three-phase three-wire high-voltage power line, a pole-mounted transformer, and a single-phase three-wire low-voltage (AC100 / 200V) power line. The power grid 3 supplies AC grid power to the distribution board 300.

[0023] The electric power load 4 is a general term for devices that consume electric power. The electric power load 4 includes, for example, electrical appliances such as refrigerators, air conditioners, washing machines, personal computers, and televisions. These electric power loads 4 are connected to a single-phase three-wire power line via a distribution board 300 from a household outlet, for example.

[0024] The vehicle 5 is a vehicle equipped with a rechargeable in-vehicle battery (corresponding to the "battery" of the present invention), and is, for example, an electric vehicle or a plug-in hybrid vehicle. The in-vehicle battery is charged with the DC power supplied from the vehicle charging / discharging device 100, and supplies DC power to the vehicle charging / discharging device 100 during discharge.

[0025] The power conditioner 200 includes a DC terminal connected to the solar power generation device 2 and an AC terminal connected to the distribution board 300, and converts the DC power generation power input to the DC terminal into AC power generation power and outputs it from the AC terminal. The power conditioner 200 includes, for example, a DC / DC conversion circuit including switching elements, a DC / AC conversion circuit including switching elements, and a control circuit. The control circuit controls the DC / DC conversion circuit and the DC / AC conversion circuit, and communicates with the vehicle charging / discharging device 100 and the distribution board 300.

[0026] Note that the power conditioner 200 may be connected to a stationary battery (not shown). In this case, the power conditioner 200 includes, for example, a second DC / DC conversion circuit connected to a power line connecting the DC / DC conversion circuit (first DC / DC conversion circuit) and the DC / AC conversion circuit, and the second DC / DC conversion circuit is connected to the stationary battery. The stationary battery includes at least one secondary battery configured to be rechargeable and a battery management system for managing the secondary battery. As the secondary battery, for example, a lithium-ion secondary battery is used, but a secondary battery other than the lithium-ion secondary battery may be used.

[0027] The distribution board 300 is connected to the vehicle charging / discharging device 100, the power conditioner 200, the power system 3, and the power load 4. The distribution board 300 includes a switching switch and a switching control circuit that controls and communicates with the switching switch (for example, communicates with the vehicle charging / discharging device 100 or the power conditioner 200). The switching switch includes a switch (relay circuit) that turns on and off under the control of the switching control circuit, and switches the power supply source for supplying power to the power load 4 to any one of the vehicle charging / discharging device 100, the power conditioner 200, and the power system 3, for example.

[0028] As shown in FIG. 2, the vehicle charging and discharging device 100 includes a main body 110 and a connector 120 with a cable connected to the main body 110. The main body 110 includes a power conversion unit 130 and a control unit 140. The control unit 140 includes a power conversion control unit 141, a communication control unit 142, and a setting unit 143.

[0029] The main body 110 is a housing that houses the power conversion unit 130 and the control unit 140. The connector 120 is a charging and discharging connector connected to the charging port of the vehicle 5, and in this embodiment, it is a charging and discharging connector compliant with the CHAdeMO standard.

[0030] The power conversion unit 130 performs an AC / DC conversion operation (corresponding to the "charging operation" of the present invention) of converting the AC power input from the distribution board 300 side into DC power and outputting it to the connector 120 side, and a DC / AC conversion operation (corresponding to the "discharging operation" of the present invention) of converting the DC power input from the connector 120 side into AC power and outputting it to the distribution board 300 side. The power conversion unit 130 includes, for example, an AC terminal, an AC / DC conversion circuit including a switching element, a DC / DC conversion circuit including a switching element, and a DC terminal in order from the distribution board 300 side.

[0031] The control unit 140 may be composed of a digital circuit such as a microprocessor or a digital signal processor, or may be composed of a circuit combining a digital circuit and an analog circuit. Further, the setting unit 143 of the control unit 140 may include a touch panel configured to be operable by the user.

[0032] The power conversion control unit 141 controls the AC / DC conversion operation and the DC / AC conversion operation performed by the power conversion unit 130. Specifically, when charging the in-vehicle battery, the power conversion control unit 141 causes the power conversion unit 130 to perform an AC / DC conversion operation and controls the charging current, charging voltage, and / or charging power supplied to the in-vehicle battery to approach a predetermined target value. On the other hand, when discharging the in-vehicle battery, the power conversion control unit 141 causes the power conversion unit 130 to perform a DC / AC conversion operation and controls the discharge current, discharge voltage, and / or discharge power output from the in-vehicle battery (or the alternating current, alternating voltage, and / or alternating power output to the distribution board 300 side) to approach a predetermined target value.

[0033] Further, the power conversion control unit 141 causes the power conversion unit 130 to perform an operation according to the operation mode set by the setting unit 143. The operation modes include a first operation mode in which the power conversion unit 130 is caused to perform a first operation (PV surplus power charging operation) and a second operation mode in which the power conversion unit 130 is caused to perform a second operation (green operation). Note that both the first operation mode and the second operation mode are included in the charge / discharge modes of the CHAdeMO standard.

[0034] During the first operation (PV surplus power charging operation), when the AC power generated by the solar power generation device 2 output from the power conditioner 200 exceeds the power consumption of the power load 4, the power conversion unit 130 charges the in-vehicle battery using the surplus power obtained by subtracting the power consumption from the AC power generated. The first operation (PV surplus power charging operation) is an operation that requires the communication control unit 142 to be in a continuous communication state (for example, a standby state) with the vehicle 5.

[0035] During the second operation (green operation), when the AC power generated exceeds the power consumption, the power conversion unit 130 charges the in-vehicle battery using the surplus power. On the other hand, when the AC power generated is less than the power consumption, the power conversion unit 130 discharges the in-vehicle battery so as to reduce the grid power supplied from the power grid 3 to the power load 4 (for example, not to purchase electricity). The second operation (green operation) is also an operation that requires the communication control unit 142 to be in a continuous communication state (for example, a standby state) with the vehicle 5.

[0036] In this embodiment, the power conversion control unit 141 performs automatic charging control only when causing the power conversion unit 130 to perform the first operation or the second operation. The automatic charging control is control for causing the power conversion unit 130 to perform a charging operation (AC / DC conversion operation) so that the charging rate of the in-vehicle battery becomes equal to or higher than the minimum charging rate when the charging rate of the in-vehicle battery is lower than the minimum charging rate. Details of the automatic charging control will be described later.

[0037] The communication control unit 142 communicates with the power conditioner 200, the distribution board 300, and the vehicle 5 and controls the communication (turns the communication on / off). In this embodiment, the communication between the communication control unit 142 and the vehicle 5 is communication defined by the CHAdeMO standard and is performed via the connector 120.

[0038] In the V2H guidelines defined by the CHAdeMO standard, when the charging rate of the in-vehicle battery mounted on the vehicle is lower than the minimum charging rate during the charge / discharge mode and the state where the charging current value to the in-vehicle battery is lower than the minimum current value indicated by the vehicle continues for 5 seconds or more, the vehicle charge / discharge device is defined to stop the communication with the vehicle (turn it off). In other words, when the state where the charging current value is lower than the minimum current value lasts for less than 5 seconds, the vehicle charge / discharge device can continue the communication with the vehicle. For this reason, even when the charging rate of the in-vehicle battery is lower than the minimum charging rate, the communication control unit 142 of this embodiment keeps the communication with the vehicle 5 in the on state until the preset setting time (set to a maximum of 5 seconds) elapses.

[0039] In addition, if the charging current value to the in-vehicle battery does not reach the minimum current value indicated by the vehicle 5 before the set time elapses, in accordance with the V2H guidelines, the communication control unit 142 needs to turn off the communication with the vehicle 5. However, in this embodiment, through automatic charging control, the in-vehicle battery is charged with a charging current equal to or higher than the minimum current value before the set time elapses. That is, in this embodiment, the communication with the vehicle 5 does not turn off during the charge / discharge mode and remains on during the charge / discharge mode. Here, the off state means a state in which communication with the vehicle 5 is impossible and a state in which communication from the vehicle 5 is not received. The off state includes, for example, a stopped state. On the other hand, the on state means a state in which communication with the vehicle 5 is possible and a state in which communication from the vehicle 5 is received. The on state corresponds to the above-mentioned "continuous state" and includes, for example, a standby state.

[0040] During automatic charging control, the communication control unit 142 communicates with the vehicle 5 according to the communication defined by the CHAdeMO standard, and the vehicle 5 transmits battery information regarding the current charge rate (hereinafter simply referred to as "charge rate"), the minimum charge rate, and the minimum current value to the communication control unit 142. Thereby, the communication control unit 142 can acquire the charge rate, the minimum charge rate, and the minimum current value of the in-vehicle battery. Note that the charge rate of the in-vehicle battery is, for example, set such that the fully charged state of the in-vehicle battery is 100% and the fully discharged state of the in-vehicle battery is 0%.

[0041] The setting unit 143 sets the minimum charge rate. The minimum charge rate includes a manually set minimum charge rate (corresponding to the "first minimum charge rate" of the present invention) and an automatically set minimum charge rate (corresponding to the "second minimum charge rate" of the present invention). In the case of manual setting, the setting unit 143 sets the user-set value set by the user as the minimum charge rate. The user can set the user-set value to any value in the range of 0 to 100% in the setting unit 143. Also, before the user-set value is set by the user, the setting unit 143 may set the default value of the user-set value as the minimum charge rate. On the other hand, in the case of automatic setting, the setting unit 143 sets the minimum charge rate acquired from the vehicle 5 as the minimum charge rate as it is.

[0042] The setting unit 143 performs a priority setting on whether to prioritize the minimum charge rate by automatic setting or the minimum charge rate by manual setting. That is, the user can select whether to prioritize automatic setting or manual setting in the setting unit 143. In the case of prioritizing automatic setting, the setting unit 143 sets a charging threshold value, which will be described later, based on the minimum charge rate acquired from the vehicle 5. In the case of prioritizing manual setting, the setting unit 143 sets a charging threshold value, which will be described later, based on the user setting value.

[0043] The setting unit 143 sets the driving mode. That is, the user can set the driving mode to the first driving mode or the second driving mode in the setting unit 143. When the driving mode is set to the first driving mode or the second driving mode, automatic charging control is performed. When the driving mode is not set to the first driving mode and not set to the second driving mode, automatic charging control is not performed.

[0044] Next, with reference to FIG. 3, the automatic charging control performed by the control unit 140 will be described.

[0045] When the control unit 140 receives a start operation for the first operation or the second operation, the control unit 140 starts the process of automatic charging control. The case of receiving a start operation means, for example, when the first driving mode or the second driving mode is set in the setting unit 143, or when a start operation for the first operation or the second operation is performed by an external device (for example, a remote control capable of communicating with the control unit 140). In this way, by performing automatic charging control only when a start operation for the first operation or the second operation is received, unnecessary charging of the in-vehicle battery can be avoided.

[0046] In the control unit 140 that has started the process of automatic charging control, the communication control unit 142 communicates with the vehicle 5 in accordance with the CHAdeMO standard, and acquires the charging rate [%] and the minimum charging rate [%] of the in-vehicle battery from the vehicle 5 (S01). The process of step S01 corresponds to the "acquisition process" of the present invention. In this way, by the communication control unit 142 acquiring the minimum charging rate from the vehicle 5, the setting unit 143 can set the minimum charging rate for each vehicle 5. Note that in the process of step S01, it is preferable for the communication control unit 142 to also acquire the above-mentioned minimum current value [A] from the vehicle 5.

[0047] Next, the setting unit 143 determines whether it is automatic setting priority for the priority setting (S02). The setting unit 143 has previously set whether it is automatic setting priority or manual setting priority according to the user's selection. If it is not automatic setting priority, that is, in the case of manual setting priority (No in S02), the setting unit 143 proceeds to the process of step S03. If it is automatic setting priority (Yes in S02), the setting unit 143 proceeds to the process of step S04. Note that in the process of step S01, if the communication control unit 142 cannot acquire the minimum charging rate of the in-vehicle battery, the setting unit 143 may determine that it is not automatic setting priority (No in S02). That is, the automatic charging control of the present embodiment is also effective when the minimum charging rate cannot be acquired.

[0048] The setting unit 143 that has shifted to the process of step S03 sets the minimum charging rate (user set value) by manual setting as the charging threshold (S03). On the other hand, the setting unit 143 that has shifted to the process of step S04 sets, as the charging threshold, a value obtained by adding a predetermined value to the minimum charging rate by automatic setting (the minimum charging rate acquired from the vehicle 5) (S04). In the present embodiment, the setting unit 143 sets the predetermined value to 2%, but the predetermined value can be appropriately changed within the range of 1% to 10%.

[0049] Next, the power conversion control unit 141 compares the charging rate acquired by the communication control unit 142 from the vehicle 5 in step S01 with the charging threshold set by the setting unit 143 in step S03 or step S04, and determines whether the charging rate is lower than the charging threshold (S05). The process of step S05 corresponds to the "comparison process" of the present invention. Note that the process of this step S05 may be performed by the communication control unit 142 or the setting unit 143.

[0050] When the charging rate is lower than the charging threshold (Yes in S05), the power conversion control unit 141 causes the power conversion unit 130 to automatically charge the in-vehicle battery so that the state where the charging current value to the in-vehicle battery is lower than the minimum current value indicated by the vehicle 5 (acquired in S01) does not continue for 5 seconds or more (S06). Note that the time from the determination of Yes in step S05 to the start of the process of step S06 is at most about 1 second. Therefore, the duration of the state where the charging current value is lower than the minimum current value is also at most about 1 second.

[0051] During automatic charging, the power conversion unit 130 charges the in-vehicle battery with a charging current equal to or higher than the minimum current value indicated by the vehicle 5 using the AC generated power and / or the grid power. For example, when the AC generated power exceeds the power consumption, the power conversion unit 130 charges the in-vehicle battery using the surplus power of the AC generated power. On the other hand, when the AC generated power is lower than the power consumption, the power conversion unit 130 performs the charging operation (AC / DC conversion operation) of the in-vehicle battery using the grid power. The communication control unit 142 communicates with the distribution board 300 so that the above charging is performed, and the distribution board 300 switches the power transmission path in the distribution board 300.

[0052] When the charging rate is below the charging threshold (Yes in S05), the communication control unit 142 keeps the communication with the vehicle 5 on until the preset set time (up to 5 seconds) elapses. The power conversion control unit 141 causes the power conversion unit 130 to perform automatic charging (S06) before the set time elapses. When the charging rate becomes equal to or higher than the charging threshold due to the automatic charging (S06) of the power conversion unit 130 (No in S05), the power conversion control unit 141 causes the power conversion unit 130 to perform the first operation or the second operation (S07). That is, when the charging rate is below the charging threshold, the control unit 140 starts automatic charging without stopping the communication with the vehicle 5 (before the set time elapses), and when the charging rate becomes equal to or higher than the charging threshold by the automatic charging, the first operation or the second operation is started.

[0053] As described above, the power conversion control unit 141 causes the power conversion unit 130 to perform the first operation or the second operation that has received the start operation before the start of the automatic charging control process (S07), and ends the automatic charging control process. Note that the control unit 140 preferably repeats the automatic charging control process at a predetermined control cycle even during the first operation or the second operation, and keeps the communication with the vehicle 5 in a continuous state (on state).

[0054] As described above, in the power supply system 1 and the vehicle charging and discharging device 100, when the charging rate is below the charging threshold (where the charging threshold ≥ the minimum charging rate), the power conversion control unit 141 performs automatic charging control to cause the power conversion unit 130 to perform a charging operation until the charging rate becomes equal to or higher than the charging threshold, so that the state where the charging current value is below the minimum current value does not continue for 5 seconds or more. As a result, even if the charging rate is below the charging threshold, the communication with the vehicle 5 can be kept on by performing automatic charging by the automatic charging control. Therefore, according to the power supply system 1 and the vehicle charging and discharging device 100, an operation (the first operation or the second operation in this embodiment) that requires the communication with the vehicle 5 to be in a continuous state (on state) can be surely performed.

[0055] The embodiments of the power supply system and the vehicle charging and discharging device according to the present invention have been described above, but the present invention is not limited to the above embodiments.

[0056] The vehicle charging and discharging device according to the present invention includes a connector connected to a vehicle equipped with a storage battery, a power conversion unit that performs a charging operation or a discharging operation on the storage battery, a power conversion control unit that controls the power conversion unit, and a communication control unit that controls communication with the vehicle. The communication control unit keeps the communication on until a preset set time elapses even when the charging rate of the storage battery is below the minimum charging rate. If the power conversion control unit performs automatic charging control to cause the power conversion unit to perform a charging operation so that the charging rate becomes equal to or higher than the minimum charging rate from when the charging rate falls below the minimum charging rate until the set time elapses, the configuration can be changed as appropriate.

[0057] For example, in the above embodiment, the setting unit 143 sets the minimum charging rate (user setting value) by manual setting as the charging threshold, or sets a value obtained by adding a predetermined value to the minimum charging rate (minimum charging rate acquired from the vehicle 5) by automatic setting as the charging threshold. However, the minimum charging rate by automatic setting may be set as the charging threshold as it is, or a value obtained by adding a predetermined value to the minimum charging rate by manual setting may be set as the charging threshold.

[0058] In the above embodiment, the setting unit 143 can set the user setting value to an arbitrary value within the range of 0 to 100%. However, in order to effectively perform the first operation (PV surplus power charging operation) and the second operation (green operation) and reliably perform the automatic charging control, the range of the user setting value may be restricted. For example, it may be restricted to the range of 5% to 40%.

[0059] The vehicle charging and discharging device 100 of the above embodiment is connected to the distribution board 300 and generates DC charging power to be supplied to the in-vehicle storage battery of the vehicle 5 based on the AC power supplied from the distribution board 300. However, DC charging power may be generated based on DC power supplied from an arbitrary DC source. For example, the vehicle charging and discharging device 100 may be connected to the DC terminal of the power conditioner 200.

[0060] In the above embodiment, as examples of operations that require continuous communication with the vehicle 5, the first operation (PV surplus power charging operation) and the second operation (green operation) are given, but other operations may be included.

Explanation of Signs

[0061] 1 Power system 2 Photovoltaic power generation device 3 Power grid 4 Power load 5 Vehicle 100 Vehicle charging and discharging device 110 Main body 120 Connector 130 Power conversion unit 140 Control unit 141 Power conversion control unit 142 Communication control unit 143 Setting unit 200 Power conditioner 300 Distribution board

Claims

1. A connector connected to a vehicle equipped with a storage battery, a power conversion unit that performs a charging operation or a discharging operation on the storage battery, a power conversion control unit that controls the power conversion unit, a communication control unit that controls communication with the vehicle, A vehicle charging and discharging device comprising: The communication control unit: Even when the charge rate of the storage battery is below the minimum charge rate, keeps the communication on until a preset set time has elapsed, The power conversion control unit: Performs automatic charge control to cause the power conversion unit to perform the charging operation so that the charge rate becomes equal to or higher than the minimum charge rate from when the charge rate drops below the minimum charge rate until the set time has elapsed. A vehicle charging and discharging device characterized by the above.

2. Further comprising a setting unit by which a user can set the minimum charge rate, The communication control unit: Performs an acquisition process of acquiring the charge rate and the minimum charge rate from the vehicle, The power conversion control unit: Performs the automatic charge control using a first minimum charge rate that is the minimum charge rate set by the setting unit or a second minimum charge rate that is the minimum charge rate acquired by the acquisition process. The vehicle charging and discharging device according to claim 1, characterized by the above.

3. The power conversion control unit: Performs a comparison process of comparing a charge threshold set to a value equal to or higher than the minimum charge rate with the charge rate, and when the charge rate is below the charge threshold, performs the automatic charge control so that the charge rate becomes equal to or higher than the charge threshold. The setting unit: Sets the first minimum charge rate as the charge threshold, or sets a value obtained by adding a predetermined value to the second minimum charge rate as the charge threshold. The vehicle charging and discharging device according to claim 2, characterized by the above.

4. A vehicle charging and discharging device, a distribution board connected to an electric power load and an electric power system, a power conditioner connected to a power generation device and supplying the generated power of the power generation device to the vehicle charging and discharging device and / or the electric power load, A power supply system comprising: The vehicle charging and discharging device: A connector connected to a vehicle equipped with a storage battery, a power conversion unit that performs a charging operation or a discharging operation on the storage battery, a power conversion control unit that controls the power conversion unit, a communication control unit that controls communication with the vehicle, Comprising, The communication control unit: Even when the charge rate of the storage battery is below the minimum charge rate, keeps the communication on until a preset set time has elapsed, The power conversion control unit: Perform automatic charge control to cause the power conversion unit to perform the charging operation so that the charging rate becomes equal to or higher than the minimum charging rate before the set time elapses after the charging rate falls below the minimum charging rate. A power supply system characterized by this.

5. The power conditioner converts the generated power into AC generated power and supplies the AC generated power to the vehicle charging / discharging device and / or the power load via the distribution board. The power conversion unit When the AC generated power exceeds the power consumption of the power load, a first operation of performing the charging operation using the surplus power obtained by subtracting the power consumption from the AC generated power. When the AC generated power exceeds the power consumption, the charging operation is performed using the surplus power. When the AC generated power is less than the power consumption, a second operation of performing the discharging operation so as to reduce the system power supplied from the power grid to the power load. Performs When the power conversion unit performs the first operation or the second operation, the power conversion control unit performs the automatic charge control. The power supply system according to claim 4, characterized by this.

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