Device and method for realizing V2G by using discharging function of electric vehicle

Abstract

The invention discloses a device and a method for realizing V2G by using a discharge function of an electric vehicle. The device comprises a discharge management device and a V2G control device. Wherein the discharge management device is connected between the electric vehicle and the AC charging pile and is connected with the V2G control device, one end of the AC charging pile is connected with the discharge management device, and the other end of the AC charging pile is connected with the power distribution network. And the discharge management device receives the discharge current of the electric vehicle and a control instruction of the V2G control device, performs frequency modulation and voltage regulation on the discharge current according to the control instruction, and outputs the discharge current after frequency modulation and voltage regulation to the alternating current charging pile, so that the discharge current is merged into the power distribution network through the alternating current charging pile. The external discharge characteristic of the electric vehicle can be fully utilized, the external discharge capacity of the electric vehicle is converted into the V2G output capacity, and the V2G implementation cost is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the field of V2G technology, and in particular to a device and method for realizing V2G by utilizing the discharge function of an electric vehicle. Background Art

[0002] Vehicle-to-Grid (V2G) technology allows electric vehicles to feed the power in their batteries back to the grid when the grid needs it, thus becoming a distributed energy storage unit of the grid. This technology not only provides convenient charging facilities for electric vehicles, but also provides flexible energy support and scheduling capabilities for the grid, which helps to improve energy efficiency and grid stability.

[0003] To enable electric vehicles to achieve V2G, a bidirectional smart charger needs to be equipped between the power grid and the car. The bidirectional charger must have the function of charging the electric vehicle battery and should also have the ability to feed back energy to the power grid. The traditional bidirectional charger consists of a filter, a bidirectional DC / DC converter, and a bidirectional AC / DC converter. When the electric vehicle charges and discharges to the power grid, the car battery charges and discharges with the power grid through the vehicle-side DC charging port and the bidirectional charger. The bidirectional DC / DC converter and bidirectional AC / DC converter contained therein are relatively expensive, which are more suitable for centralized deployment and are not conducive to the promotion of distributed V2G. Therefore, it is urgent to propose a low-power, low-cost distributed V2G solution. Summary of the invention

[0004] The purpose of the present invention is to convert the external discharge capacity of electric vehicles into V2G output capacity, thereby reducing the implementation cost of V2G. In order to achieve the above purpose, the present invention provides a device and method for implementing V2G using the discharge function of electric vehicles.

[0005] In a first aspect, an embodiment of the present invention provides a device for implementing V2G using the discharge function of an electric vehicle, comprising: a discharge management device and a V2G control device; wherein the discharge management device is connected between the electric vehicle and an AC charging pile, and is connected to the V2G control device, and one end of the AC charging pile is connected to the discharge management device, and the other end is connected to a distribution network;

[0006] The discharge management device is used to receive the discharge current of the electric vehicle and the control instruction of the V2G control device, and perform frequency and voltage modulation on the discharge current according to the control instruction, and output the frequency and voltage modulated discharge current to the AC charging pile, so that the discharge current is incorporated into the distribution network through the AC charging pile; wherein the control instruction includes a frequency correction instruction and a voltage correction instruction;

[0007] The V2G control device is used to measure and sample the discharge current of the electric vehicle, generate a control instruction according to the measurement and sampling result and the distribution network access requirement, and send the control instruction to the discharge management device.

[0008] Preferably, the discharge management device is an AC frequency modulation and voltage regulation circuit.

[0009] Preferably, the V2G control device comprises a central processing module and a metering module, an instruction generation module and a communication module all connected to the central processing module; wherein the V2G control device is connected to the discharge management device through the instruction generation module, one end of the communication module is connected to the central processing module, and the other end is connected to the distribution network dispatching platform through a gateway;

[0010] The metering module is used to measure and sample the discharge current of the electric vehicle to obtain the frequency and voltage of the discharge current;

[0011] The communication module is used to receive the distribution network access request issued by the distribution network dispatching platform through the gateway, and send the distribution network access request to the central processing module;

[0012] The central processing module is used to receive the first metering sampling result of the metering module and the distribution network access requirement of the communication module, and send the first metering sampling result and the distribution network access requirement to the instruction generation module; wherein the first metering sampling result includes the frequency and voltage of the discharge current;

[0013] The instruction generation module is used to generate a control instruction according to the first metering sampling result and the distribution network access requirement, and send the control instruction to the discharge management device.

[0014] Preferably, the gateway is an edge gateway.

[0015] Preferably, the device further comprises: a charging management device, the charging management device is connected between the electric vehicle and the AC charging pile, and is connected to the V2G control device; wherein one end of the AC charging pile is connected to the charging management device, and the other end is connected to the power distribution network, and the V2G control device is connected to the charging management device through the central processing module;

[0016] The charging management device is used to access the charging current of the distribution network, receive the metering data of the V2G control device, generate an analog CP signal according to the metering data, and output the analog CP signal to the electric vehicle so that the analog CP signal controls the charging current to be incorporated into the electric vehicle; wherein the metering data includes the current and voltage of the charging current.

[0017] Preferably, the charging management device includes a signal output module and a guide module; wherein the output end of the signal output module is connected to the electric vehicle, and the input end is respectively connected to the V2G control device and the guide module, the output end of the guide module is connected to the signal output module, and the input end is connected to the AC charging pile;

[0018] The guiding module is used to close the AC charging pile and connect the charging current of the power distribution network through the AC charging pile;

[0019] The signal output module is used to receive the metering data of the V2G control device, calculate the charging power according to the metering data, generate an analog CP signal according to the charging power and the charging requirements of the electric vehicle, and output the analog CP signal to the electric vehicle so that the analog CP signal controls the charging current to be incorporated into the electric vehicle.

[0020] Preferably, the guiding module is a guiding circuit.

[0021] Preferably, the V2G control device is used to measure and sample the charging current of the distribution network, and send the measurement and sampling results to the charging management device.

[0022] Preferably, the metering module is used to measure and sample the charging current of the distribution network to obtain the current and voltage of the charging current;

[0023] The central processing module is used to receive the second metering sampling result of the metering module and send the second metering sampling result to the charging management device; wherein the second metering sampling result includes the current and voltage of the charging current.

[0024] In a second aspect, an embodiment of the present invention provides a method for implementing V2G by using the discharge function of an electric vehicle, and the device for implementing V2G by using the discharge function of an electric vehicle as described above includes:

[0025] Measuring and sampling the discharge current of electric vehicles, and generating control instructions based on the measurement and sampling results and distribution network access requirements;

[0026] The discharge current is frequency-modulated and voltage-regulated according to the control instruction, and the frequency-modulated and voltage-regulated discharge current is output to the AC charging pile, so that the discharge current is incorporated into the distribution network through the AC charging pile; wherein the control instruction includes a frequency correction instruction and a voltage correction instruction.

[0027] Compared with the prior art, the device and method for realizing V2G by using the discharge function of an electric vehicle in the embodiment of the present invention have the following beneficial effects: by arranging a discharge management device between the electric vehicle and the AC charging pile and a V2G control device connected to the discharge management device, the external discharge characteristics of the electric vehicle can be fully utilized, and the external discharge capacity of the electric vehicle can be converted into V2G output capacity, thereby greatly reducing the implementation cost of V2G; the discharge management device and the V2G control device have a simple structure, are easy to install, and have a small access power, so the pressure on the power supply line is relatively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a device for realizing V2G by using the discharge function of an electric vehicle according to an embodiment of the present invention;

[0029] Figure 2 is another structural schematic diagram of a device for realizing V2G by using the discharge function of an electric vehicle according to an embodiment of the present invention;

[0030] Figure 3 is another structural schematic diagram of a device for realizing V2G by using the discharge function of an electric vehicle according to an embodiment of the present invention;

[0031] Figure 4 is another structural schematic diagram of a device for realizing V2G by using the discharge function of an electric vehicle according to an embodiment of the present invention;

[0032] Figure 5 The present invention is a flowchart of a method for realizing V2G by using the discharge function of an electric vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0034] like Figure 1 As shown, an embodiment of the present invention provides a device for realizing V2G by using the discharge function of an electric vehicle, comprising: a discharge management device 1 and a V2G control device 2. The discharge management device 1 is connected between the electric vehicle and the AC charging pile, and is connected to the V2G control device 2, and one end of the AC charging pile is connected to the discharge management device 1, and the other end is connected to the distribution network.

[0035] It should be noted that electric vehicles include power batteries, on-board chargers (OBCs) and AC charging port outputs. Among them, the on-board charger has a certain vehicle to load (V2L) external discharge capability. The AC charging pile includes a first breaker, a second breaker and a 9-hole gun head, and the AC charging pile is closed through two breakers.

[0036] The discharge management device 1 is used to receive the discharge current of the electric vehicle and the control instruction of the V2G control device 2, and perform frequency modulation and voltage regulation on the discharge current according to the control instruction, and output the frequency-modulated and voltage-regulated discharge current to the AC charging pile, so that the discharge current is incorporated into the distribution network through the AC charging pile. The control instruction includes a frequency correction instruction and a voltage correction instruction. Specifically, the discharge management device 1 is an AC frequency modulation and voltage regulation circuit.

[0037] The V2G control device 2 is used to measure and sample the discharge current of the electric vehicle, generate a control instruction according to the measurement and sampling result and the distribution network access requirement, and send the control instruction to the discharge management device 1.

[0038] Specifically, the process of implementing V2G through the discharge management device 1 and the V2G control device 2 in this embodiment includes: first, the V2G control device 2 closes the first circuit breaker and the second circuit breaker of the AC charging pile through the guiding circuit. At this time, the power battery current of the electric vehicle is converted into AC current (frequency 50Hz, voltage 220V) through the on-board charger (OBC) in a DC manner. The AC current, i.e., the discharge current of the electric vehicle, is input into the discharge management device 1. The V2G control device 2 connected to the discharge management device 1 performs metering sampling on the discharge current to obtain the metering sampling result, i.e., the frequency and voltage of the discharge current. Then, the V2G control device 2 generates a control instruction according to the metering sampling result and the obtained distribution network access requirement, and sends the control instruction to the discharge management device 1. Finally, the discharge management device 1 performs frequency and voltage modulation on the discharge current according to the control instruction, and outputs the frequency and voltage modulated discharge current to the AC charging pile, so that the discharge current is incorporated into the distribution network through the AC charging pile.

[0039] It should be noted that the distribution network access requirements, i.e., the grid connection parameters of the distribution network, change in real time. Therefore, the V2G control device 2 will obtain the distribution network access requirements in real time so that the discharge management device 1 can timely correct the discharge current connected to the distribution network.

[0040] Furthermore, if Figure 2 As shown, in a specific embodiment, the V2G control device 2 includes a central processing module 21 and a metering module 22, an instruction generation module 23 and a communication module 24 connected to the central processing module 21. The V2G control device 2 is connected to the discharge management device 1 through the instruction generation module 23, and one end of the communication module 24 is connected to the central processing module 21, and the other end is connected to the distribution network dispatching platform through a gateway. Specifically, the gateway is an edge gateway.

[0041] The metering module 22 is used to measure and sample the discharge current of the electric vehicle to obtain the frequency and voltage of the discharge current.

[0042] The communication module 24 is used to receive the distribution network access request issued by the distribution network dispatching platform through the gateway, and send the distribution network access request to the central processing module 21.

[0043] The central processing module 21 is used to receive the first metering sampling result of the metering module 22 and the distribution network access requirement of the communication module 24, and send the first metering sampling result and the distribution network access requirement to the instruction generation module 23. The first metering sampling result includes the frequency and voltage of the discharge current.

[0044] The instruction generation module 23 is used to generate a control instruction according to the first metering sampling result and the distribution network access requirement, and send the control instruction to the discharge management device 1.

[0045] Specifically, the process of implementing V2G through the discharge management device 1 and the V2G control device 2 in this embodiment includes: the V2G control device 2 closes the first circuit breaker and the second circuit breaker of the AC charging pile through the guiding circuit, and at this time, the power battery current of the electric vehicle is converted into AC current (frequency 50Hz, voltage 220V) through the on-board charger (OBC) in a DC mode. The AC current, i.e., the discharge current of the electric vehicle, is input into the discharge management device 1. The metering module 22 performs metering sampling on the discharge current to obtain the first metering sampling result, i.e., the frequency and voltage of the discharge current. The communication module 24 receives the distribution network access requirement issued by the distribution network dispatching platform through the gateway, and sends the distribution network access requirement to the central processing module 21. The central processing module 21 receives the first metering sampling result of the metering module 22 and the distribution network access requirement of the communication module 24, and sends the first metering sampling result and the distribution network access requirement to the instruction generation module 23. The instruction generation module 23 generates a control instruction according to the first metering sampling result and the distribution network access requirement, and sends the control instruction to the discharge management device 1. The discharge management device 1 modulates the frequency and voltage of the discharge current according to the control instruction, and outputs the frequency-modulated and voltage-regulated discharge current to the AC charging pile, so that the discharge current is incorporated into the distribution network through the AC charging pile.

[0046] It should be noted that the distribution network access requirements, i.e., the grid connection parameters of the distribution network, change in real time. Therefore, the communication module 24 will obtain the distribution network access requirements in real time so that the discharge management device 1 can timely correct the discharge current connected to the distribution network.

[0047] Furthermore, if Figure 3 As shown, in a specific embodiment, as Figure 2 The device shown also includes: a charging management device 3.

[0048] Specifically, the charging management device 3 is connected between the electric vehicle and the AC charging pile, and is connected to the V2G control device 2. One end of the AC charging pile is connected to the charging management device 3, and the other end is connected to the distribution network. The V2G control device 2 is connected to the charging management device 3 through the central processing module 21.

[0049] The charging management device 3 is used to access the charging current of the distribution network, receive the metering data of the V2G control device 2, generate an analog CP signal according to the metering data, and output the analog CP signal to the electric vehicle so that the analog CP signal controls the charging current to be incorporated into the electric vehicle. The metering data includes the current and voltage of the charging current.

[0050] The V2G control device 2 is used to measure and sample the charging current of the distribution network and send the measurement and sampling results to the charging management device 3.

[0051] The metering module 22 is used to measure and sample the charging current of the distribution network to obtain the current and voltage of the charging current.

[0052] The central processing module 21 is used to receive the second metering sampling result of the metering module 22, and send the second metering sampling result to the charging management device 3. The second metering sampling result includes the current and voltage of the charging current.

[0053] Specifically, the process of charging electric vehicles through the distribution network in this embodiment through the charging management device 3 and the V2G control device 2 includes: after the AC charging pile is closed by the charging management device 3, the charging current (mains power) of the distribution network is connected through the 9-hole gun head of the AC charging pile. The metering module 22 performs metering sampling on the charging current of the distribution network to obtain the current and voltage of the charging current, i.e., the second metering sampling result. The central processing module 21 receives the second metering sampling result of the metering module 22, and sends the second metering sampling result to the charging management device 3. The charging management device 3 generates an analog CP signal according to the second metering sampling result, and outputs the analog CP signal to the electric vehicle, so that the analog CP signal controls the on-board charger of the electric vehicle to convert the charging current into direct current and charge it into the power battery.

[0054] It should be noted that the CP signal received by the electric vehicle is simulated by the charging management device according to the strategy, so the CP signal of the original AC charging pile is actually isolated and re-simulated and input into the electric vehicle.

[0055] Furthermore, if Figure 4 As shown, in a specific embodiment, the charging management device 3 includes a signal output module 31 and a guiding module 32 .

[0056] Specifically, the output end of the signal output module 31 is connected to the electric vehicle, and the input end is respectively connected to the V2G control device 2 and the guidance module 32 ; the output end of the guidance module 32 is connected to the signal output module 31 , and the input end is connected to the AC charging pile.

[0057] The guiding module 32 is used to close the AC charging pile and access the charging current of the power distribution network through the AC charging pile. Specifically, the guiding module 32 is a guiding circuit.

[0058] The signal output module 31 is used to receive the metering data of the V2G control device 2, calculate the charging power according to the metering data, generate an analog CP signal according to the charging power and the charging requirements of the electric vehicle, and output the analog CP signal to the electric vehicle so that the analog CP signal controls the charging current to be incorporated into the electric vehicle.

[0059] Specifically, the process of charging electric vehicles by the distribution network through the charging management device 3 and the V2G control device 2 in this embodiment includes: after the AC charging pile is closed by the guiding module 32, the charging current (mains power) of the distribution network is connected through the 9-hole gun head of the AC charging pile. The metering module 22 performs metering sampling on the charging current of the distribution network to obtain the current and voltage of the charging current, i.e., the second metering sampling result. The central processing module 21 receives the second metering sampling result of the metering module 22, and sends the second metering sampling result to the signal output module 31. The signal output module 31 calculates the charging power according to the second metering sampling result, and generates an analog CP signal according to the charging power and the charging requirements of the electric vehicle, and outputs the analog CP signal to the electric vehicle, so that the analog CP signal controls the on-board charger of the electric vehicle to convert the charging current into direct current and charge it into the power battery.

[0060] It should be noted that the CP signal received by the electric vehicle is simulated by the signal output module 31 according to the strategy, so the CP signal of the original AC charging pile is actually isolated and re-simulated and input into the electric vehicle.

[0061] The embodiment of the present invention is a device for realizing V2G by using the discharge function of an electric vehicle. By arranging a discharge management device between the electric vehicle and an AC charging pile and a V2G control device connected to the discharge management device, the external discharge characteristics of the electric vehicle can be fully utilized, and the external discharge capacity of the electric vehicle can be converted into V2G output capacity, thereby greatly reducing the implementation cost of V2G. The discharge management device and the V2G control device have a simple structure, are easy to install, and have a small access power, so the pressure on the power supply line is relatively reduced.

[0062] like Figure 5 As shown, an embodiment of the present invention provides a method for implementing V2G by using the discharge function of an electric vehicle, and the device for implementing V2G by using the discharge function of an electric vehicle as described above includes the steps of:

[0063] S1. Measure and sample the discharge current of the electric vehicle, and generate control instructions according to the measurement and sampling results and the distribution network access requirements;

[0064] S2. According to the control instruction, the discharge current is frequency-modulated and voltage-regulated, and the frequency-modulated and voltage-regulated discharge current is output to the AC charging pile, so that the discharge current is connected to the distribution network through the AC charging pile.

[0065] Specifically, the control instruction includes a frequency correction instruction and a voltage correction instruction.

[0066] It should be noted that the specific definition of the above-mentioned method of realizing V2G by using the discharge function of an electric vehicle refers to the definition of the above-mentioned device for realizing V2G by using the discharge function of an electric vehicle. The two have the same functions and effects and will not be repeated here.

[0067] In summary, the embodiment of the present invention provides a device and method for realizing V2G by using the discharge function of an electric vehicle. By providing a discharge management device between the electric vehicle and the AC charging pile and a V2G control device connected to the discharge management device, the external discharge characteristics of the electric vehicle can be fully utilized, and the external discharge capacity of the electric vehicle can be converted into V2G output capacity, thereby greatly reducing the implementation cost of V2G. The discharge management device and the V2G control device have a simple structure, are easy to install, and have a small access power, so the pressure on the power supply line is relatively reduced.

[0068] Each embodiment in this specification is described in a progressive manner, and the parts that are directly the same or similar to each other can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the method embodiment, since it is basically similar to the device embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the device embodiment. It should be noted that the various technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A device for realizing V2G by using the discharge function of an electric vehicle, characterized in that: include: A discharge management device and a V2G control device; wherein the discharge management device is connected between the electric vehicle and the AC charging pile, and is connected to the V2G control device, and one end of the AC charging pile is connected to the discharge management device, and the other end is connected to the distribution network; The discharge management device is used to receive the discharge current of the electric vehicle and the control instruction of the V2G control device, and perform frequency and voltage modulation on the discharge current according to the control instruction, and output the frequency and voltage modulated discharge current to the AC charging pile, so that the discharge current is incorporated into the distribution network through the AC charging pile; wherein the control instruction includes a frequency correction instruction and a voltage correction instruction; The V2G control device is used to measure and sample the discharge current of the electric vehicle, generate a control instruction according to the measurement and sampling result and the distribution network access requirement, and send the control instruction to the discharge management device.

2. The device according to claim 1, characterized in that The discharge management device is an AC frequency modulation and voltage regulation circuit.

3. The device according to claim 1, characterized in that The V2G control device includes a central processing module and a metering module, an instruction generation module and a communication module connected to the central processing module; wherein the V2G control device is connected to the discharge management device through the instruction generation module, one end of the communication module is connected to the central processing module, and the other end is connected to the distribution network dispatching platform through a gateway; The metering module is used to measure and sample the discharge current of the electric vehicle to obtain the frequency and voltage of the discharge current; The communication module is used to receive the distribution network access request issued by the distribution network dispatching platform through the gateway, and send the distribution network access request to the central processing module; The central processing module is used to receive the first metering sampling result of the metering module and the distribution network access requirement of the communication module, and send the first metering sampling result and the distribution network access requirement to the instruction generation module; wherein the first metering sampling result includes the frequency and voltage of the discharge current; The instruction generation module is used to generate a control instruction according to the first metering sampling result and the distribution network access requirement, and send the control instruction to the discharge management device.

4. The device according to claim 3, characterized in that The gateway is an edge gateway.

5. The device according to any one of claims 3 to 4, characterized in that: The device further comprises: a charging management device, which is connected between the electric vehicle and the AC charging pile and is connected to the V2G control device; wherein one end of the AC charging pile is connected to the charging management device and the other end is connected to the power distribution network, and the V2G control device is connected to the charging management device via the central processing module; The charging management device is used to access the charging current of the distribution network, receive the metering data of the V2G control device, generate an analog CP signal according to the metering data, and output the analog CP signal to the electric vehicle so that the analog CP signal controls the charging current to be incorporated into the electric vehicle; wherein the metering data includes the current and voltage of the charging current.

6. The device according to claim 5, characterized in that The charging management device includes a signal output module and a guide module; wherein the output end of the signal output module is connected to the electric vehicle, and the input end is respectively connected to the V2G control device and the guide module, the output end of the guide module is connected to the signal output module, and the input end is connected to the AC charging pile; The guiding module is used to close the AC charging pile and connect the charging current of the power distribution network through the AC charging pile; The signal output module is used to receive the metering data of the V2G control device, calculate the charging power according to the metering data, generate an analog CP signal according to the charging power and the charging requirements of the electric vehicle, and output the analog CP signal to the electric vehicle so that the analog CP signal controls the charging current to be incorporated into the electric vehicle.

7. The device according to claim 6, characterized in that The guiding module is a guiding circuit.

8. The device according to claim 5, characterized in that The V2G control device is used to measure and sample the charging current of the distribution network and send the measurement and sampling results to the charging management device.

9. The device according to claim 5, characterized in that The metering module is used to measure and sample the charging current of the distribution network to obtain the current and voltage of the charging current; The central processing module is used to receive the second metering sampling result of the metering module and send the second metering sampling result to the charging management device; wherein the second metering sampling result includes the current and voltage of the charging current.

10. A method for realizing V2G by using the discharge function of an electric vehicle, using the device for realizing V2G by using the discharge function of an electric vehicle as claimed in any one of claims 1 to 9, characterized in that: include: Measuring and sampling the discharge current of electric vehicles, and generating control instructions based on the measurement and sampling results and distribution network access requirements; The discharge current is frequency-modulated and voltage-regulated according to the control instruction, and the frequency-modulated and voltage-regulated discharge current is output to the AC charging pile, so that the discharge current is incorporated into the distribution network through the AC charging pile; wherein the control instruction includes a frequency correction instruction and a voltage correction instruction.

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