Testing device for V2G direct current charging pile

Abstract

The invention relates to a testing device for a V2G direct current charging pile. The testing device comprises a charging pile interface which is suitable for being connected with a charging gun of the V2G direct current charging pile; the load connecting gun is suitable for being connected with a charging port of a load; the direct-current electric energy metering module selectively measures charging direct-current electric energy transmitted to the load by the V2G direct-current charging pile or discharging direct-current electric energy transmitted to the V2G direct-current charging pile by the load; and the controller is configured to be in communication connection with the direct-current electric energy metering module so as to control the direct-current electric energy metering module to be converted between the measurement of the charging direct-current electric energy and the measurement of the discharging direct-current electric energy. The testing device can conveniently detect the charging direct-current electric energy and the discharging direct-current electric energy of the V2G direct-current charging pile in the charging and discharging process, so that the electric energy metering unit of the V2G direct-current charging pile is verified.

Description

Technical Field

[0001] The present invention relates to the technical field of testing equipment, and in particular to a testing device for a V2G direct current charging pile. Background Art

[0002] V2G DC charging pile, namely Vehicle-to-Grid DC charging pile, is an innovative electric vehicle charging equipment. It has the function of bidirectional energy transmission, which can not only provide DC fast charging service for electric vehicles, but also extract electric energy from the car battery and feed it back to the grid when the grid needs it, realizing the bidirectional flow of electric energy. V2G DC charging pile has many advantages such as improving grid stability, optimizing energy dispatching, creating economic benefits and promoting the use of renewable energy, so it has received more and more attention.

[0003] The core components of the V2G DC charging pile include bidirectional DCDC converter, bidirectional ACDC converter, filter and intelligent control system, etc. Among them, the bidirectional DCDC converter is responsible for adjusting the voltage to ensure that the output voltage matches the voltage of the electric vehicle battery; the bidirectional ACDC converter is responsible for converting the AC power in the grid into DC power in the charging mode to meet the needs of the electric vehicle battery, and is responsible for converting the DC power back to AC power in the discharge mode and feeding it back to the grid.

[0004] V2G DC charging piles usually have an energy metering unit to detect the charging energy delivered by the power grid to the electric vehicle and the discharge energy fed back by the electric vehicle to the power grid. However, the prior art lacks effective testing devices, making it difficult to effectively verify the accuracy of the energy metering unit of the V2G DC charging pile.

[0005] Therefore, this field needs a new technical solution to solve the above problems. Summary of the invention

[0006] In order to solve or improve to a certain extent the technical problem that it is difficult to effectively calibrate the power metering unit of the V2G DC charging pile in the prior art, the present invention provides a test device for the V2G DC charging pile. The test device includes: a charging pile interface, the charging pile interface is suitable for connecting to the charging gun of the V2G DC charging pile; a load connecting gun, the load connecting gun is suitable for connecting to the charging port of the load; a DC power metering module, the DC power metering module can selectively measure the charging DC power delivered by the V2G DC charging pile to the load or the discharging DC power delivered by the load to the V2G DC charging pile; and a controller, the controller is configured to form a communication connection with the DC power metering module to control the DC power metering module to switch between measuring the charging DC power and measuring the discharging DC power.

[0007] It can be understood by those skilled in the art that the test device for V2G DC charging pile of the present invention includes components such as a charging pile interface, a load connection gun, a DC power metering module and a controller. Among them, the charging pile interface is used to connect to the charging gun of the V2G DC charging pile; the load connection gun is used to connect to the connection port of the load (such as an electric car); the DC power metering module has a bidirectional measurement function, which can not only measure the charging DC power delivered by the V2G DC charging pile to the load, but also measure the discharge DC power delivered by the load to the V2G; the controller forms a communication connection with the DC power metering module to control the DC power metering module to switch between measuring the charging DC power and measuring the discharge DC power. Therefore, the test device for V2G DC charging pile of the present invention can conveniently detect the charging DC power and the discharge DC power of the V2G DC charging pile during the actual charging and discharging process, thereby verifying the power metering unit (especially the DC power metering unit) of the V2G DC charging pile.

[0008] In the preferred technical solution of the test device for V2G DC charging piles, the test device further includes: an AC power metering module, which can selectively measure the charging AC power delivered by the power supply system to the V2G DC charging pile or the discharging AC power delivered by the V2G DC charging pile to the power supply system; and the controller is configured to form a communication connection with the AC power metering module to control the AC power metering module to switch between measuring the charging AC power and measuring the discharging AC power. The AC power metering module in the test device of the present invention has a bidirectional measurement function, which can not only measure the charging AC power delivered by the power supply system (such as the power grid, energy storage system, etc.) to the V2G DC charging pile, but also measure the discharging AC power delivered by the V2G DC charging pile to the power supply system. Further, the controller forms a communication connection with the AC power metering module to control the AC power metering module to switch between measuring the charging AC power and measuring the discharging AC power. In this way, the test device of the present invention can further calibrate the AC power metering unit of the V2G DC charging pile.

[0009] In the preferred technical solution of the test device for V2G DC charging pile, the DC power metering module and the AC power metering module are configured to verify the displayed DC power and the displayed AC power of the V2G DC charging pile respectively by the high-frequency pulse number preset method. The high-frequency pulse number preset method has the advantages of high precision, strong anti-interference ability, wide measurement range, fast response speed, good measurement stability, etc., which can improve measurement efficiency and reduce measurement costs, so as to more comprehensively verify the displayed DC power and the displayed AC power of the V2G DC charging pile.

[0010] In the preferred technical solution of the above-mentioned test device for V2G DC charging piles, the test device also includes: a three-phase voltage measurement module, which can selectively measure the charging voltage transmitted by the power supply system to the V2G DC charging pile or the discharge voltage transmitted by the V2G DC charging pile to the power supply system. The three-phase voltage measurement module in the test device of the present invention has a bidirectional measurement function, which can not only measure the charging voltage transmitted by the power supply system to the V2G DC charging pile, but also measure the discharge voltage transmitted by the V2G DC charging pile to the power supply system. In this way, the test device of the present invention can not only obtain the charging voltage or discharge voltage used to calculate the AC electric energy, but also can further calibrate the AC voltage monitoring unit of the V2G DC charging pile.

[0011] In the preferred technical solution of the test device for V2G DC charging pile, the test device further includes: a V / V conversion module, which is used to convert the charging voltage or the discharging voltage into a preset voltage. The V / V conversion module can convert the charging voltage or the discharging voltage measured by the three-phase voltage measurement module into a preset voltage signal with different amplitudes, ratios or ranges to meet the input requirements of the signal conversion device (such as a digital conversion module). It has the advantages of high precision, strong anti-interference ability, good flexibility, high reliability, and easy integration and maintenance, and plays an important role in signal conditioning, interface matching and system compatibility.

[0012] In the preferred technical solution of the above-mentioned test device for V2G DC charging piles, the test device also includes: a three-phase current measurement module, which can selectively measure the charging current delivered by the power supply system to the V2G DC charging pile or the discharge current delivered by the V2G DC charging pile to the power supply system. The three-phase current measurement module in the test device of the present invention has a bidirectional measurement function, which can not only measure the charging current delivered by the power supply system to the V2G DC charging pile, but also measure the discharge current delivered by the V2G DC charging pile to the power supply system. In this way, the test device of the present invention can not only obtain the charging current or discharge current used to calculate the AC electric energy, but also can further calibrate the AC current monitoring unit of the V2G DC charging pile.

[0013] In the preferred technical solution of the test device for the V2G DC charging pile, the test device further includes: an I / V conversion module, which is used to convert the charging current or the discharging current into a preset voltage. The I / V conversion module is an electronic device that converts a current signal into a voltage signal. It can convert the charging current or the discharging current measured by the three-phase current measurement module into a preset voltage signal with different amplitudes, proportions or ranges to meet the input requirements of the signal conversion device (such as a digital conversion module). The I / V conversion module has the advantages of high precision, strong anti-interference ability, wide input range, low power consumption, and easy integration and maintenance. It plays an important role in signal conditioning, interface matching and system compatibility.

[0014] In the preferred technical solution of the test device for V2G DC charging pile, the test device further includes: a digital conversion module, which is connected to the three-phase voltage measurement module, the V / V conversion module, the three-phase current measurement module, the I / V conversion module and the controller. The digital conversion module is an electronic device that converts continuously transmitted analog signals into digital signals. It can convert analog signals measured by each functional module into digital signals and transmit them to the controller for processing and analysis by the controller.

[0015] In the preferred technical solution of the test device for V2G DC charging pile, the test device further includes: a control guidance module, the control guidance module forms a communication connection with the controller, and is used to verify whether the V2G DC charging pile and the load form a communication connection. The setting of the control guidance module can verify whether the V2G DC charging pile and the load form a communication connection to meet data exchange and communication needs.

[0016] In the preferred technical solution of the test device for V2G DC charging piles, the test device also includes one or more of a display operation module, a communication connection module, a data storage module and a power supply module that are respectively connected to the controller in communication. The display operation module can facilitate user interaction. The communication connection module can be easily connected to an external device (such as a computer, a tablet, a mobile phone, etc.) to realize data transmission. The data storage module is convenient for storing various types of test data or intermediate data. The power supply module is convenient for providing power to each functional component in the test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0018] Figure 1 1 is a connection diagram of an embodiment of a test device for a V2G DC charging pile according to the present invention;

[0019] Figure 2 1 is a system schematic diagram of an embodiment of a test device for a V2G DC charging pile according to the present invention.

[0020] List of reference numerals:

[0021] 1. Test device; 11. Charging pile interface; 12. Load connection gun; 13. DC power metering module; 14. AC power metering module; 15. Three-phase voltage measurement module; 16. V / V conversion module; 17. Three-phase current measurement module; 18. I / V conversion module; 19. Digital conversion module; 110. Control guidance module; 111. Display operation module; 112. Communication connection module; 113. Data storage module; 114. Power supply module; 115. Controller; 2. V2G DC charging pile; 21. Charging gun; 3. Power supply system; 4. Transformer; 5. Load; 51. Charging port. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0023] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "front", "back", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0024] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In order to solve or improve to a certain extent the technical problem that it is difficult to effectively calibrate the electric energy metering unit of the V2G DC charging pile in the prior art, the present invention provides a test device 1 for the V2G DC charging pile 2. The test device 1 includes: a charging pile interface 11, the charging pile interface 11 is suitable for connecting to the charging gun 21 of the V2G DC charging pile 2; a load connecting gun 12, the load connecting gun 12 is suitable for connecting to the charging port 51 of the load 5; a DC electric energy metering module 13, the DC electric energy metering module 13 can selectively measure the charging DC electric energy delivered by the V2G DC charging pile 2 to the load 5 or the discharging DC electric energy delivered by the load 5 to the V2G DC charging pile 2; and a controller 115, the controller 115 is configured to form a communication connection with the DC electric energy metering module 13 to control the DC electric energy metering module 13 to switch between measuring the charging DC electric energy and measuring the discharging DC electric energy.

[0026] Figure 1 1 is a connection diagram of an embodiment of a test device for a V2G DC charging pile according to the present invention; Figure 2 Schematic diagram of a system of an embodiment of a test device for a V2G DC charging pile according to the present invention. Figure 1 and Figure 2 As shown, in one or more embodiments, the test device 1 for V2G DC charging pile 2 of the present invention is electrically connected to V2G DC charging pile 2 and load 5 respectively. Among them, V2G DC charging pile 2 includes but is not limited to bidirectional DCDC converter, bidirectional ACDC converter, filter, electric energy metering unit, voltage monitoring unit, current monitoring unit, and intelligent control system and other components (not shown in the figure), so that V2G DC charging pile 2 has the function of bidirectional energy transmission. In one or more embodiments, V2G DC charging pile 2 is electrically connected to the power grid through transformer 4. Alternatively, V2G DC charging pile 2 can also be electrically connected to a suitable power supply system 3 (such as energy storage system, etc.). The type of load 5 is not limited, such as electric vehicles.

[0027] like Figure 1 and Figure 2 As shown, in one or more embodiments, the test device 1 for the V2G DC charging pile 2 of the present invention includes a charging pile interface 11 and a load connection gun 12 that are spaced apart from each other. The charging pile interface 11 can be connected to the charging gun 21 of the V2G DC charging pile 2, and the load connection gun 12 can be connected to the charging port 51 of the load 5. The charging pile interface 11 and the load connection gun 12 can be processed with reference to the relevant requirements of the "Connection Device for Conductive Charging of Electric Vehicles" (GB / T20234-2023) to have good mechanical and electrical properties.

[0028] like Figure 2As shown, in one or more embodiments, the test device 1 of the present invention includes a DC power metering module 13. The DC power metering module 13 has a bidirectional measurement function, and can selectively measure the charging DC power transmitted from the V2G DC charging pile 2 to the load 5 or the discharging DC power transmitted from the load 5 to the V2G DC charging pile 2. In one or more embodiments, the DC power metering module 13 is configured to also use a high-frequency pulse number preset method to calibrate the displayed DC power of the V2G DC charging pile 2, so as to more comprehensively detect the accuracy of the DC power meter of the V2G DC charging pile 2. Specifically, first, according to the rated current and rated voltage of the DC energy meter of the V2G DC charging pile 2, the pulse output value of the DC energy meter is calculated, and the value is set as the preset pulse number; then, the test device 1 is electrically connected to the V2G DC charging pile 2, so that the DC energy metering module 13 is connected to the DC energy meter under test, and it is ensured that both are in a continuous operation state; then, when the DC energy meter outputs a certain number of low-frequency pulses (the number must be pre-set and meet relevant standards), the high-frequency pulse number of the DC energy metering module 13 is recorded as the measured high-frequency pulse number m; then, using a predetermined formula, the measured high-frequency pulse number m is compared with the calculated (or preset) high-frequency pulse number m0, thereby calculating the relative error γ (%) of the DC energy meter under test. Among them, the calculation formula for the calculated high-frequency pulse number m0 is usually: m0=CH0×N / CLK×KI×KU, where CH0 is the high-frequency pulse constant of the DC power metering module 13, N is the low-frequency pulse number (or preset pulse number) of the DC power meter under test, CLK is the low-frequency pulse constant of the DC power meter under test, KI and KU are the transformation ratios of the current and voltage transformers respectively (when there are no external current and voltage transformers, KI and KU are both equal to 1).

[0029] like Figure 2 As shown, in one or more embodiments, the test device 1 of the present invention includes a controller 115. The controller 115 is configured to form a communication connection with the DC power metering module 13 so as to control the DC power metering module 13 to switch between measuring charging DC power and measuring discharging DC power. In addition, the controller 115 forms a communication connection with the DC power metering module 13, and can also conveniently obtain the charging DC power or discharging DC power measured by the DC power metering module 13. The controller 115 includes but is not limited to components such as a microprocessor (i.e., MCU), an E2PROM memory, a field programmable gate array (i.e., FPGA), and an isolator.

[0030] like Figure 2As shown, in one or more embodiments, the test device 1 of the present invention further includes an AC power metering module 14. The AC power metering module 14 has a bidirectional measurement function, and can selectively measure the charging AC power transmitted by the power supply system 3 to the V2G DC charging pile 2 or the discharging AC power transmitted by the V2G DC charging pile 2 to the power supply system 3. In addition, the AC power metering module 14 forms a communication connection with the controller 115, so that the AC power metering module 14 can switch between measuring the charging AC power and measuring the discharging AC power under the control of the controller 115, and can also conveniently transmit the measured charging AC power or discharging AC power to the controller 115. In one or more embodiments, the AC power metering module 14 is configured to also use a high-frequency pulse number preset method to verify the displayed AC power of the V2G DC charging pile 2, so as to more comprehensively detect the accuracy of the AC power meter of the V2G DC charging pile 2. For specific test methods, please refer to the verification of the displayed DC power of the V2G DC charging pile 2 using the high-frequency pulse number preset method, which will not be repeated here.

[0031] like Figure 2 As shown, in one or more embodiments, the test device 1 of the present invention includes a three-phase voltage measurement module 15. The three-phase voltage measurement module 15 has a bidirectional measurement function, and can selectively measure the charging voltage transmitted by the power supply system 3 to the V2G DC charging pile 2 or the discharging voltage transmitted by the V2G DC charging pile 2 to the power supply system 3. In this way, not only the charging voltage or discharging voltage for calculating the AC electric energy can be obtained, but also the AC voltage monitoring unit of the V2G DC charging pile 2 can be further verified. The three-phase voltage measurement module 15 forms a communication connection with the controller 115 so as to transmit the measured charging voltage or discharging voltage signal to the controller 115. The three-phase voltage measurement module 15 is connected to the V2G DC charging pile 2 and the power supply system 3 through three independent sampling channels, respectively, so as to sample and measure the input or output three-phase AC voltage.

[0032] like Figure 2 As shown, in one or more embodiments, the test device 1 of the present invention includes a V / V conversion module 16. The V / V conversion module is used to convert the charging voltage or discharging voltage measured by the three-phase voltage measurement module 15 into a preset voltage. The V / V conversion module 16 can convert the charging voltage or discharging voltage measured by the three-phase voltage measurement module 15 into a preset voltage signal with different amplitudes, ratios or ranges to meet the input requirements of the signal conversion device (such as a digital conversion module). The V / V conversion module 16 forms a communication connection with the controller 115 so as to transmit the converted preset voltage signal to the controller 115. The V / V conversion module can adopt a resistor-capacitor parallel voltage division technology to overcome the error introduced by the distributed parameters in the loop, and can effectively suppress the oscillation caused by the high-frequency signal, thereby improving the frequency response characteristics of the voltage divider.

[0033] like Figure 2 As shown, in one or more embodiments, the test device 1 of the present invention includes a three-phase current measurement module 17. The three-phase current measurement module 17 has a bidirectional measurement function, and can selectively measure the charging current delivered by the power supply system 3 to the V2G DC charging pile 2 or the discharge current delivered by the V2G DC charging pile 2 to the power supply system 3. In this way, not only can the charging current or discharge current for calculating the AC electric energy be obtained, but the AC current monitoring unit of the V2G DC charging pile 2 can also be further verified. The three-phase current measurement module 17 forms a communication connection with the controller 115 so as to transmit the measured charging current or discharge current signal to the controller 115. Accordingly, the three-phase current measurement module 17 is also connected to the V2G DC charging pile 2 and the power supply system 3 through three independent sampling channels, so as to sample and measure the input or output three-phase AC current.

[0034] like Figure 2 As shown, in one or more embodiments, the test device 1 of the present invention includes an I / V conversion module 18. The I / V conversion module is used to convert the charging current or discharging current measured by the three-phase current measurement module 17 into a preset voltage. The I / V conversion module 18 is an electronic device that converts a current signal into a voltage signal. It can convert the charging current or discharging current measured by the three-phase current measurement module 17 into a preset voltage signal with different amplitudes, ratios or ranges to meet the input requirements of a signal conversion device (such as a digital conversion module). The I / V conversion module is designed with a current comparator, and provides current to the secondary winding through an electronic circuit and automatically tracks the closed-loop automatic control system of the primary current, which has the characteristics of wide measurement limit and high accuracy.

[0035] like Figure 2 As shown, in one or more embodiments, the test device 1 of the present invention includes a digital conversion module 19. The digital conversion module 19 is respectively connected to the three-phase voltage measurement module 15, the V / V conversion module 16, the three-phase current measurement module 17, the I / V conversion module 18 and the controller 115. The digital conversion module is an electronic device that converts continuously transmitted analog signals into digital signals. It can convert analog signals measured by each functional module into digital signals and transmit them to the controller 115, so that the controller 115 can process and analyze them.

[0036] like Figure 2As shown, in one or more embodiments, the test device 1 of the present invention further includes a control guidance module 110. The control guidance module 110 forms a communication connection with the controller 115 to verify whether the V2G DC charging pile 2 and the load 5 form a communication connection to meet data exchange and communication needs. The control guidance module 110 can perform interoperability testing in accordance with the "Electric Vehicle Conductive Charging Interoperability Test Specification Part 1: Power Supply Equipment" (GB / T 34657.1-2017).

[0037] like Figure 1 and Figure 2 As shown, in one or more embodiments, the test device 1 of the present invention further includes a display operation module 111. The display operation module 111 is connected to the controller 115 for communication, which is convenient for user interaction. The display operation module 111 can be a liquid crystal touch screen or other suitable form, which is convenient for users to set parameters, control the test process and view test results.

[0038] like Figure 1 and Figure 2 As shown, in one or more embodiments, the test device 1 of the present invention further includes a communication connection module 112. The communication connection module 112 forms a communication connection with the controller 115, which is convenient for connecting with an external device (such as a computer, a tablet, a mobile phone, etc.) or a virtual cloud to realize data transmission and interaction. The communication connection module 112 can use a suitable communication interface, such as RS232, USB, LAN, etc.

[0039] like Figure 2 As shown, in one or more embodiments, the test device 1 of the present invention further includes a data storage module 113. The data storage module 113 is in communication connection with the controller 115 to store various test data or intermediate data. The data storage module 113 can be an EEPROM memory or other suitable memory.

[0040] like Figure 2 As shown, in one or more embodiments, the test device 1 of the present invention further includes a power supply module 114. The power supply module 114 is in communication connection with the controller 115 so as to provide power to each functional component in the test device 1. The power supply module 114 can be, but is not limited to, a lead-acid battery, a lithium battery, etc.

[0041] like Figure 1 and Figure 2As shown, when the present invention is used for the test device 1 of the V2G DC charging pile 2, the forward charging metering can be performed through the following operation steps: First, the charging pile interface 11 of the test device 1 is connected to the charging gun 21 of the V2G DC charging pile 2, and the load connection gun 12 is connected to the charging port 51 of the load 5. Then, the V2G DC charging pile 2 is controlled to start the charging program. At this time, the electric energy in the power supply system 3 is transmitted to the load 5 through the V2G DC charging pile 2 and the test device 1 in turn, and the DC current converted by the V2G DC charging pile 2 flows from the charging pile interface 11 into the test device 1. The controller 115 calculates the charging DC electric energy by controlling the V / V conversion module, the I / V conversion module, the digital conversion module and the DC electric energy metering module 13. In addition, the controller 115 calculates the charging AC electric energy by controlling the three-phase voltage measurement module 15, the three-phase current measurement module 17, the digital conversion module and the AC electric energy metering module 14. The V2G DC charging pile 2 passes through the test device 1 and flows into the battery in the load 5 for storage. When the preset power value is reached, the V2G DC charging pile 2 stops charging. The charging DC power measured by the DC power metering module 13 and the charging AC power measured by the AC power metering module 14 are read and compared with the charging DC power and charging AC power displayed by the V2G DC charging pile 2, respectively.

[0042] like Figure 1 and Figure 2 As shown, when the present invention is used for the test device 1 of the V2G DC charging pile 2, reverse charging metering can be performed through the following operating steps: First, the charging pile interface 11 of the test device 1 is connected to the charging gun 21 of the V2G DC charging pile 2, and the load connection gun 12 is connected to the charging port 51 of the load 5. Then, the V2G DC charging pile 2 is controlled to start the discharge program. At this time, the DC power in the load 5 is transmitted to the power supply system 3 through the test device 1 and the V2G DC charging pile 2 in turn. The built-in inverter in the V2G DC charging pile 2 can convert DC power into AC power and feed it back to the power supply system 3 (such as the power grid). The controller 115 calculates the discharged AC power by controlling the three-phase voltage measurement module 15, the three-phase current measurement module 17, the digital conversion module and the AC power metering module 14. In addition, the controller 115 calculates the discharged DC power by controlling the V / V conversion module, the I / V conversion module, the digital conversion module and the DC power metering module 13. The discharged AC power measured by the AC power metering module 14 and the discharged DC power measured by the DC power metering module 13 are read and compared with the discharged AC power and discharged DC power displayed by the V2G DC charging pile 2 respectively.

[0043] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A test device (1) for a V2G DC charging pile (2), characterized in that: The testing device (1) comprises: A charging pile interface (11), wherein the charging pile interface (11) is suitable for connecting to a charging gun (21) of the V2G DC charging pile (2); A load connection gun (12), wherein the load connection gun (12) is suitable for connecting to a charging port (51) of a load (5); a direct current power metering module (13), wherein the direct current power metering module (13) can selectively measure the charging direct current power transmitted by the V2G direct current charging pile (2) to the load (5) or the discharging direct current power transmitted by the load (5) to the V2G direct current charging pile (2); and A controller (115) is configured to form a communication connection with the DC power metering module (13) to control the DC power metering module (13) to switch between measuring the charging DC power and measuring the discharging DC power.

2. The test device (1) for a V2G DC charging pile (2) according to claim 1, characterized in that: The testing device (1) further comprises: an AC power metering module (14), wherein the AC power metering module (14) can selectively measure the charging AC power transmitted by the power supply system (3) to the V2G DC charging pile (2) or the discharging AC power transmitted by the V2G DC charging pile (2) to the power supply system (3); and The controller (115) is configured to form a communication connection with the AC power metering module (14) to control the AC power metering module (14) to switch between measuring the charging AC power and measuring the discharging AC power.

3. The test device (1) for a V2G DC charging pile (2) according to claim 2, characterized in that: The DC power metering module (13) and the AC power metering module (14) are configured to respectively verify the displayed DC power and the displayed AC power of the V2G DC charging pile (2) by means of a high-frequency pulse number preset method.

4. The test device (1) for a V2G DC charging pile (2) according to claim 2, characterized in that: The testing device (1) further comprises: A three-phase voltage measurement module (15), wherein the three-phase voltage measurement module (15) can selectively measure a charging voltage transmitted by the power supply system (3) to the V2G DC charging pile (2) or a discharging voltage transmitted by the V2G DC charging pile (2) to the power supply system (3).

5. The test device (1) for a V2G DC charging pile (2) according to claim 4, characterized in that: The testing device (1) further comprises: A V / V conversion module (16), the V / V conversion module is used to convert the charging voltage or the discharging voltage into a preset voltage.

6. The test device (1) for a V2G DC charging pile (2) according to claim 5, characterized in that: The testing device (1) further comprises: A three-phase current measurement module (17), wherein the three-phase current measurement module (17) can selectively measure a charging current transmitted by the power supply system (3) to the V2G DC charging pile (2) or a discharging current transmitted by the V2G DC charging pile (2) to the power supply system (3).

7. The test device (1) for a V2G DC charging pile (2) according to claim 6, characterized in that: The testing device (1) further comprises: An I / V conversion module (18), the I / V conversion module (18) being used to convert the charging current or the discharging current into a preset voltage.

8. The test device (1) for a V2G DC charging pile (2) according to claim 7, characterized in that: The testing device (1) further comprises: A digital conversion module (19), wherein the digital conversion module (19) is communicatively connected with the three-phase voltage measurement module (15), the V / V conversion module (16), the three-phase current measurement module (17), the I / V conversion module and the controller (115).

9. The test device (1) for a V2G DC charging pile (2) according to claim 1, characterized in that: The testing device (1) further comprises: A control guidance module (110), the control guidance module (110) forms a communication connection with the controller (115), and is used to verify whether the V2G DC charging pile (2) and the load (5) form a communication connection.

10. The test device (1) for a V2G DC charging pile (2) according to claim 1, characterized in that: The testing device (1) further comprises one or more of a display operation module (111), a communication connection module (112), a data storage module (113) and a power supply module (114) which are respectively connected to the controller (115) for communication.

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