A test system for a DC charging pile

Abstract

The present application relates to the technical field of charging pile detection, and particularly to a test system for a DC charging pile. The test system includes a DC power supply module, a connection gun seat, an energy feedback module, and an information processing module. The positive and negative poles of the energy feedback module are connected in parallel with the positive and negative poles of the DC power supply module, and the positive and negative voltage poles of the information processing module are connected in parallel with the positive and negative poles of the DC power supply module. The positive and negative poles of the DC power supply module are connected to the positive and negative poles of the connection gun seat, and the connection gun seat is used for detachably connecting to the output interface of the DC charging pile. An energy recovery end is provided on the energy feedback module, and the energy recovery end is used for detachably connecting to the power grid supplying power to the DC charging pile. The information processing module is used for detecting the output current and output voltage of the DC charging pile, and for adjusting the voltage of the energy recovery end. By setting the energy feedback module, energy loss is reduced, the problems of light-load reactive power and imbalance are avoided, and the reliability of the test system is improved.

Description

Technical Field

[0001] This application relates to the technical field of charging pile detection, and particularly to a test system for a DC charging pile. Background Art

[0002] With the popularization of new energy vehicles, the demand for charging piles required by new energy electric vehicles has also increased; during the actual application of charging piles, it is necessary to detect various functions of the charging piles to ensure their normal use, and before the DC charging piles leave the factory, it is also necessary to conduct aging tests on the charging piles; in the prior art, the detection equipment for DC charging piles has the following disadvantages: the electric energy during the test is wasted in vain, resulting in serious energy waste during the test process; in addition, during the test process, the charging pile will also have problems of reactive power and imbalance under light load. Summary of the Invention

[0003] Aiming at the above problems of the prior art, the purpose of this application is to reduce energy consumption, avoid the problems of light load reactive power and imbalance, and improve the reliability of the test system by setting up an energy feedback module.

[0004] To solve the above problems, this application provides a test system for a DC charging pile, including a DC power supply module, a connection gun seat, an energy feedback module, and an information processing module.

[0005] The positive and negative poles of the energy feedback module are connected in parallel with the positive and negative poles of the DC power supply module, and the positive and negative poles of the voltage of the information processing module are connected in parallel with the positive and negative poles of the DC power supply module.

[0006] The positive and negative poles of the DC power supply module are connected to the positive and negative poles of the connection gun seat, and the connection gun seat is used for detachably connecting to the output interface of the DC charging pile.

[0007] The energy feedback module is provided with an energy recovery end, and the energy recovery end is used for detachably connecting to the power supply grid of the DC charging pile.

[0008] The information processing module is used to detect the output current and output voltage of the DC charging pile, and is also used to adjust the voltage of the energy recovery end.

[0009] In an embodiment of this application, the energy recovery end includes an inverter unit, and the output end of the inverter unit is detachably connected to the power supply grid.

[0010] The inverter unit is used to convert direct current into alternating current.

[0011] In an embodiment of this application, the energy recovery end further includes a DC-DC conversion unit, and the input end of the DC-DC conversion unit is connected to the DC power supply module.

[0012] The output end of the DC-DC conversion unit is connected to the input end of the inverter unit, and the information processing module adjusts the voltages on both sides of the DC-DC conversion unit.

[0013] In the embodiment of the present application, the energy feedback module further includes a measurement unit and a balancing unit. The measurement unit is used to measure the current and voltage in the inverter unit and the DC-DC conversion unit.

[0014] The balancing unit is used to adjust the output voltage of the DC-DC conversion unit based on the measurement results of the measurement unit and the adjustment instruction of the information processing module.

[0015] In the embodiment of the present application, the test system of the DC charging pile further includes a connection port, and the positive and negative poles of the connection port are connected in parallel with the positive and negative poles of the DC power supply module.

[0016] The connection port is used for detachable connection with a load or the test system of another DC charging pile.

[0017] In the embodiment of the present application, the test system of the DC charging pile further includes a protection element, and the protection element is arranged at the positive output end of the connection gun seat.

[0018] In the embodiment of the present application, the test system of the DC charging pile further includes a shunt. The information processing module includes a current detection unit, and the shunt is connected to the current detection unit.

[0019] In the embodiment of the present application, the information processing module includes a controller, a first resistor group, and a second resistor group. Both the first resistor group and the second resistor group include a plurality of resistors connected in parallel.

[0020] The first resistor group is arranged at the positive input end of the controller, and the second resistor group is arranged at the negative output end of the controller.

[0021] In the embodiment of the present application, a first switch is arranged at the positive input end of the DC power supply module, and a second switch is arranged at the negative output end of the DC power supply module.

[0022] The information processing module is further used to control the opening and closing states of the first switch and the second switch.

[0023] In the embodiment of the present application, the energy feedback module is detachably arranged on the test system of the DC charging pile through a pluggable terminal socket.

[0024] In an embodiment of the present application, the information processing module further includes an information input unit, and the information input unit is configured to receive a test instruction for the DC charging pile.

[0025] Due to the above technical solution, the test system for a DC charging pile described in the present application has the following beneficial effects:

[0026] By providing an energy feedback module in parallel with the positive and negative poles of the DC power supply module in the test system of the DC charging pile, specifically, the energy feedback module can feed back a part of the direct current output by the DC charging pile to the power supply grid of the DC charging pile through the energy recovery end, thereby reducing the energy loss during the test of the DC charging pile; at the same time, by providing the energy feedback module and setting the information processing module to adjust the voltage of the energy recovery end of the energy feedback module, voltage fluctuations can be avoided, ensuring that the output voltage of the energy feedback module is stable and the phase is accurate, so as to supplement the imbalance and reactive power generated during DC charging operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the present application, the accompanying drawings required for the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] FIG. 1 is a schematic structural diagram of a test system for a DC charging pile provided by an embodiment of the present application;

[0029] FIG. 2 is a schematic structural diagram of a DC-DC conversion unit in the test system for a DC charging pile provided by an embodiment of the present application;

[0030] FIG. 3 is a schematic structural diagram of an inverter unit in the test system for a DC charging pile provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application.

[0032] As used herein, "an embodiment" or "embodiment" refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present application. In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data may be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0033] Combined with Figure 1 , a test system for a DC charging pile provided by an embodiment of the present application is introduced. The system includes a DC power supply module, a connection gun base, an energy feedback module, and an information processing module. The positive and negative poles of the energy feedback module are connected in parallel with the positive and negative poles of the DC power supply module, and the positive and negative poles of the voltage of the information processing module are connected in parallel with the positive and negative poles of the DC power supply module; the positive and negative poles of the DC power supply module are connected to the positive and negative poles of the connection gun base, and the connection gun base is used for detachably connecting to the output interface of the DC charging pile; an energy recovery terminal is provided on the energy feedback module, and the energy recovery terminal is used for detachably connecting to the power grid supplying power to the DC charging pile; the information processing module is used for detecting the output current and output voltage of the DC charging pile, and for adjusting the voltage of the energy recovery terminal.

[0034] In an embodiment of the present application, the DC power supply module is used to simulate a vehicle battery pack to determine the output voltage of the DC charging pile; the energy feedback module feeds back most of the direct current of the DC charging pile to the power grid supplying power to the DC charging pile through the energy recovery terminal; specifically, the voltage value of the DC power supply module is a high-voltage DC power supply of 200 - 1000V.

[0035] In a specific embodiment of the present application, the information processing module includes an analog battery management unit (Battery Management System, BMS). The DC charging pile determines the output voltage of the DC charging pile based on the DC power supply module, and the DC charging pile determines the output current of the DC charging pile based on the analog battery management unit.

[0036] In the embodiments of the present application, the parallel connection of the positive and negative poles of the energy feedback module with the positive and negative poles of the DC power supply module indicates that the voltage of the energy feedback module is the same as that of the DC power supply module; the parallel connection of the positive and negative poles of the voltage of the information processing module with the positive and negative poles of the DC power supply module indicates that the voltage of the information processing module is the same as that of the DC power supply module; the positive and negative poles of the DC power supply module are connected to the positive and negative poles of the connection gun base, and the detachable connection between the connection gun base and the output interface of the DC charging pile indicates that the output voltage of the connection gun base is determined based on the voltage of the DC power supply module.

[0037] In a specific embodiment of the present application, when the connection gun base is connected to the output interface of the DC charging pile and the energy recovery end of the energy feedback module is connected to the power supply grid of the DC charging pile, the direct current output by the DC charging pile includes a first direct current and a second direct current. The first direct current is the direct current used for the information processing module to perform detection, and the second direct current is the direct current used to be fed back to the power supply grid. Specifically, the current of the second direct current is greater than that of the first direct current; preferably, the current of the second direct current is more than 10,000 times the current of the first direct current.

[0038] In the embodiments of the present application, by setting an energy feedback module in parallel with the positive and negative poles of the DC power supply module in the test system of the DC charging pile, specifically, the energy feedback module can feed back a part of the direct current output by the DC charging pile to the power supply grid of the DC charging pile through the energy recovery end, thereby reducing the energy loss during the test of the DC charging pile; at the same time, by setting the energy feedback module and setting the information processing module to adjust the voltage of the energy recovery end of the energy feedback module, voltage fluctuations can be avoided, ensuring that the output voltage of the energy feedback module is stable and the phase is accurate, so as to supplement the imbalance and reactive power generated during DC charging operation.

[0039] In a specific embodiment of the present application, the connection gun base is a 250A standard charging gun base. Specifically, the connection gun base has loop connection lines corresponding to the DC power supply positive interface DC+, DC power supply negative interface DC-, ground wire interface PE, high-speed communication interface S+, low-speed communication interface S-, first connection status confirmation interface CC1, second connection status confirmation interface CC2, low-voltage auxiliary power supply positive interface A+, and low-voltage auxiliary power supply negative interface A-. Among them, each loop connection line is provided with an on-off function and a parameter acquisition interface.

[0040] In a specific embodiment of the present application, the communication unit of the information processing module can communicate with other modules of the test system by means of wired communication and / or wireless communication. Among them, wired communication includes but is not limited to RS485 communication, Ethernet communication, RS232 communication, and USB interface communication.

[0041] In a specific embodiment of the present application, the communication unit in the information processing module may include wireless communication units such as Wi-Fi and Bluetooth.

[0042] In a specific embodiment of the present application, the communication unit may further include an RS485 communication unit. The RS485 communication unit includes a power supply and a signal isolation transceiver. The signal isolation transceiver is used to receive and send signals with target identifiers. The RS485 communication unit includes three communication circuits. One of the three communication circuits is used to communicate with the DC power supply module to implement the vehicle battery simulation function; one of the three communication circuits is used to communicate with the connection port to implement communication with an external parallel load; one of the three communication circuits is used to communicate with the energy feedback module.

[0043] In a specific embodiment of the present application, the communication unit may further include an Ethernet communication unit. The Ethernet communication unit is used for data interaction with a host computer, and the host computer may be an electronic device such as a computer or a mobile phone.

[0044] In a specific embodiment of the present application, the communication unit may further include an RS232 communication unit. The RS232 communication unit is used to output the information of the controller in the information processing module to facilitate user debugging and verification.

[0045] In a specific embodiment of the present application, the communication unit may further include a USB interface unit. The USB interface unit is used to transmit the updated information and data records of the controller in the output information processing module.

[0046] In a specific embodiment of the present application, the information processing module includes a power supply unit and an information processing unit. The information processing unit is used to detect the output current and output voltage of the DC charging pile, and then implement the detection of the functions, performance, and protocol consistency of the DC charging pile, etc. The information processing unit is also used to adjust the voltage of the energy recovery end. The power supply unit is used to supply power to the information processing unit.

[0047] In a specific embodiment of the present application, the information processing unit is used to send an adjustment instruction to the energy recovery end to adjust the voltage of the energy recovery end. Specifically, the adjustment instruction includes target voltage information.

[0048] In a specific embodiment of the present application, the information processing unit may be a controller.

[0049] In an embodiment of the present application, the energy recovery end includes an inverter unit. The output end of the inverter unit is detachably connected to the power supply grid. The inverter unit is used to convert direct current into alternating current.

[0050] In the embodiment of the present application, by setting an inverter unit at the energy recovery end, part of the DC current output by the DC output pile flows back to the power grid of the DC charging pile through the inverter unit, thereby reducing the energy loss during the testing process of the DC charging pile.

[0051] In the embodiment of the present application, the energy recovery end further includes a DC-DC conversion unit (DC / DC unit). The input end of the DC-DC conversion unit is connected to the DC power module; the output end of the DC-DC conversion unit is connected to the input end of the inverter unit, and the information processing module adjusts the voltages on both sides of the DC-DC conversion unit.

[0052] In a specific embodiment of the present application, the DC-DC conversion unit includes a DC input end DC1 and a DC output end DC2. The DC input end is connected to the positive and negative poles of the connection gun seat, and energy transfer is carried out between the DC input end and the DC output end in an LLC resonant inductor manner; the DC output end is connected to the input end of the inverter unit.

[0053] In the embodiment of the present application, by setting the DC-DC conversion unit, the information processing module can adjust the voltages on both sides of the DC-DC conversion unit, thereby ensuring the stability of the voltage on the output side of the DC-DC conversion unit, avoiding voltage fluctuations, ensuring the stability of the output voltage of the energy feedback module and the accuracy of the phase, so as to supplement the imbalance and reactive power generated during DC charging operation.

[0054] Reference Figure 2 , in a specific embodiment of the present application, the DC input end includes a first bridge Q1, a second bridge Q2, a third bridge Q3, a fourth bridge Q4, and an input coil. Among them, Q1 and Q2 are connected in series to form a first bridge group, Q3 and Q4 are connected in series to form a second bridge group, the first bridge group and the second bridge group are connected in parallel, one end of the input coil is arranged between the first bridge and the second bridge, and the other end of the input coil is arranged between the third bridge and the fourth bridge.

[0055] In a specific embodiment of the present application, the DC output end includes a fifth bridge Q5, a sixth bridge Q6, a seventh bridge Q7, an eighth bridge Q8, and an output inductor. Among them, Q5 and Q6 are connected in series to form a third bridge group, Q7 and Q8 are connected in series to form a fourth bridge group, the third bridge group and the fourth bridge group are connected in parallel, one end of the output inductor is arranged between the fifth bridge and the sixth bridge, and the other end of the output inductor is arranged between the seventh bridge and the eighth bridge.

[0056] In a specific embodiment of the present application, the first bridge Q1, the second bridge Q2, the third bridge Q3, the fourth bridge Q4, the fifth bridge Q5, the sixth bridge Q6, the seventh bridge Q7, and the eighth bridge Q8 are all single-phase dual-active bridges. Specifically, silicon carbide with 1200V and 75mmΩ can be used.

[0057] In a specific embodiment of the present application, a one-way diode D1 is provided between the DC input terminal and the positive electrode of the connection gun base. Specifically, it can be a silicon carbide diode to ensure unidirectional energy flow.

[0058] Reference Figure 3 , in a specific embodiment of the present application, the inverter unit can adopt a three-level topology (Active Neutral Point Clamped, ANPC). Specifically, the three-level topology includes a phase A circuit, a phase B circuit, a phase C circuit, and a neutral point circuit; the phase A circuit, the phase B circuit, and the phase C circuit are arranged in parallel at the output terminal DC2 of the DC-DC conversion unit.

[0059] In a specific embodiment of the present application, taking the phase A as an example, the phase A circuit includes four first-type switches and two second-type switches. Among them, the frequency of the four first-type switches is higher than that of the second-type switches. The four first-type switches are connected in series. After the two second-type switches are connected in series, they are connected in parallel with the middle two second-type switches in series; specifically, the four first-type switches are Q1A, Q5A, Q4A, and Q6A, and specifically, gallium nitride devices can be used; the two second-type switches are Q2A and Q3A, and the frequency of Q2A and Q3A is 100 Hz. Specifically, a field effect transistor with 650V / 40mΩ can be used, specifically a Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET); the phase B circuit and the phase C circuit are similar to the phase A circuit and will not be elaborated here.

[0060] In a specific embodiment of the present application, the output terminal of the phase A circuit is , the output terminal of the phase B circuit is , the output terminal of the phase C circuit is .

[0061] In a specific embodiment of the present application, the maximum conversion power of a single energy feedback module is 10 kW, reducing the size of components to improve the convenience of the test system.

[0062] In a specific embodiment of the present application, the inverter unit adopts a three-level topology structure, which can not only achieve a high switching frequency of 100 Hz, but also reduce the size of components, improve the power density of energy feedback, and thus improve the convenience of the test system.

[0063] In the embodiments of the present application, the energy feedback module further includes a measurement unit and a balancing unit. The measurement unit is used to measure the current and voltage in the inverter unit and the DC-DC conversion unit; the balancing unit is used to adjust the output voltage of the DC-DC conversion unit based on the measurement results of the measurement unit and the adjustment instructions of the information processing module.

[0064] In a specific embodiment of the present application, the measurement unit includes a current detection element and a voltage detection element. The energy recovery terminal further includes a current detection connection port, which is used to connect with the current detection element. Specifically, the current detection element is an open current transformer. The current detection connection port includes IDC terminals, Ia0 terminals, Ia1 terminals, Ib0 terminals, Ib1 terminals, Ic0 terminals, and Ic1 terminals. Among them, the IDC terminals are arranged in the DC-DC conversion unit, and the IDC terminals include I DC1, I DC2, I DC3, and I DC4. The Ia0 terminals, Ia1 terminals, Ib0 terminals, Ib1 terminals, Ic0 terminals, and Ic1 terminals are arranged in the inverter unit; the voltage detection element is used to detect the voltage at the input end (DC1) of the DC-DC conversion unit, the output end (DC2 at the input of the inverter unit) of the DC-DC conversion unit, and the output end of the inverter unit. Specifically, the output end of the inverter unit includes the output end of the A-phase circuit , the output end of the B-phase circuit , and the output end of the C-phase circuit .

[0065] In a specific embodiment of the present application, when the voltage at the output end (DC2 at the input of the inverter unit) of the DC-DC conversion unit is inconsistent with the target voltage of the adjustment instruction, or the voltage phase at the output end of the inverter unit is inconsistent with the grid voltage phase, or the current phase at the output end of the inverter unit is inconsistent with the grid current phase, it is determined that the measurement result of the measurement unit is in an unbalanced state.

[0066] In a specific embodiment of the present application, when the measurement result is in an unbalanced state, the balancing unit stabilizes the capacitor voltage corresponding to the DC output terminal DC2 to the target voltage based on the adjustment instruction of the information processing module. For example, in the balanced state, the voltage of DC2 is 750V, and in the unbalanced state, the voltage of DC2 is adjusted to the target voltage of 800V; among them, the adjustment instruction includes target voltage information; specifically, the balancing unit can use the PID algorithm to control the power device switch (MOSFET) to adjust the capacitor voltage corresponding to DC2 to stabilize the voltage at the DC output terminal of the DC-DC conversion unit.

[0067] In a specific embodiment of the present application, the balancing unit is used to perform current compensation on the power devices of the inverter unit based on the detection results of the current detection element. Specifically, the balancing unit is used to determine the target compensation current, the target negative sequence, and the target zero sequence based on the detection results of the current detection element and the calculation method of positive, negative, and zero sequence currents (for example, the symmetrical component method), and is used to control the power elements of the inverter unit to compensate the current based on the target compensation current, the target negative sequence, and the target zero sequence. Among them, the compensation value is the opposite of the target compensation current, the target negative sequence, and the target zero sequence.

[0068] In an embodiment of the present application, the test system of the DC charging pile further includes a connection port, and the positive and negative poles of the connection port are connected in parallel with the positive and negative poles of the DC power supply module; the connection port is used for detachably connecting with a load or the test system of another DC charging pile.

[0069] In an embodiment of the present application, by setting the connection port to provide other loads, the DC charging pile can output a larger current, and thus the DC charging pile can output a larger power; on the other hand, the connection port can also be connected to the test system of another DC charging pile, thereby realizing the parallel connection of the test systems of multiple DC charging piles, further avoiding energy waste and reducing the energy loss during the test of the DC charging pile.

[0070] In a specific embodiment of the present application, in the case where multiple test systems of DC charging piles are connected in parallel, the output current of a single energy feedback module can be adjusted in sequence based on the maximum conversion power of the single energy feedback module, and the adjustment sequence can be determined based on the identification coding identifier corresponding to the test system of each DC charging pile.

[0071] In an embodiment of the present application, the test system of the DC charging pile further includes a protection element, and the protection element is arranged at the positive output end of the connection gun seat.

[0072] In an embodiment of the present application, by setting a protection resistor at the positive output end of the connection gun seat, it is possible to avoid the overall damage of the test system caused by excessive current output of the connection gun seat, thereby improving the reliability of the test system.

[0073] In a specific embodiment of the present application, the protection element is a fuse F1. When the output current of the DC charging pile exceeds the preset current threshold, the fuse wire of the fuse breaks to protect the test system and the DC charging pile.

[0074] In an embodiment of the present application, the test system of the DC charging pile further includes a shunt, and the information processing module includes a current detection unit, and the shunt is connected to the current detection unit.

[0075] In a specific embodiment of the present application, the shunt RW is used to convert the output current of the DC pile into a current signal that can be processed by the information processing unit.

[0076] In the embodiment of the present application, by providing a shunt connected to the current detection unit, the information processing module samples and analyzes the output current of the DC charging pile, thereby improving the reliability of the test system.

[0077] In the embodiment of the present application, the information processing module includes a controller, a first resistor group, and a second resistor group; both the first resistor group and the second resistor group include a plurality of resistors connected in parallel; the first resistor group is disposed at the positive input terminal of the controller, and the second resistor group is disposed at the negative output terminal of the controller.

[0078] In the embodiment of the present application, by providing the first resistor group and the second resistor group, the function of the insulation at the pile end of the DC charging pile can be tested using the principle of an unbalanced bridge. Specifically, the unbalanced bridge indirectly tests the insulation function at the pile end of the DC charging pile by measuring the unbalanced voltage of the bridge.

[0079] In a specific embodiment of the present application, the first resistor group is R1 - R3, and the second resistor group is R4 - R6. During the process of testing the insulation function at the pile end of the DC charging pile, the information processing unit is powered by the power supply unit.

[0080] In a specific embodiment of the present application, the controller may adopt an RK3568 processor.

[0081] In other embodiments of the present application, the controller may also adopt processors of other models.

[0082] In the embodiment of the present application, a first switch is provided at the positive input terminal of the DC power supply module, and a second switch is provided at the negative output terminal of the DC power supply module; the information processing module is further configured to control the opening and closing states of the first switch and the second switch.

[0083] In the embodiment of the present application, by providing the first switch and the second switch, the access of the DC power supply module is controlled, thereby facilitating the simulation of the vehicle battery voltage or the termination of the simulation of the vehicle battery voltage, and improving the controllability of the test system.

[0084] In a specific embodiment of the present application, the first switch K5 and the second switch K6 are high - voltage DC contactors.

[0085] In the embodiment of the present application, the energy feedback module is detachably disposed on the test system of the DC charging pile through a plug - in terminal socket.

[0086] In the embodiment of the present application, by providing a plug - in terminal socket for detachable connection of the energy feedback module, the current of the DC charging pile can be selectively fed back to the power grid, thereby improving the test flexibility of the test system.

[0087] In the embodiment of the present application, the information processing module further includes an information input unit, and the information input unit is used to receive a test instruction for the DC charging pile.

[0088] In the embodiment of the present application, by setting the information input unit, it is convenient to debug the test system and select test instructions, thereby improving the test flexibility of the test system for the DC charging pile.

[0089] In a specific embodiment of the present application, the information input unit may be a human-computer interaction interface. Preferably, the information input unit can also be used to display the test data of the DC charging pile.

[0090] The test system of the DC charging pile in the embodiment of the present application has the following beneficial effects:

[0091] By setting an energy feedback module in parallel with the positive and negative poles of the DC power module in the test system of the DC charging pile. Specifically, the energy feedback module can feedback part of the direct current output by the DC charging pile to the power supply grid of the DC charging pile through the energy recovery end, thereby reducing the energy loss during the test of the DC charging pile; at the same time, by setting the energy feedback module and setting the information processing module to adjust the voltage of the energy recovery end of the energy feedback module, voltage fluctuations can be avoided, ensuring that the output voltage of the energy feedback module is stable and the phase is accurate, so as to supplement the imbalance and reactive power generated during DC charging operation.

[0092] The above description has fully disclosed the specific implementation manners of the present application. It should be noted that any changes made by those skilled in the art to the specific implementation manners of the present application do not depart from the scope of the claims of the present application. Correspondingly, the scope of the claims of the present application is not limited to the foregoing specific implementation manners.

Claims

1. A test system for a DC charging pile, characterized in that, It includes a DC power supply module, a connection gun base, an energy feedback module, an information processing module, and a connection port. The positive and negative poles of the energy feedback module are connected in parallel with the positive and negative poles of the DC power supply module, and the positive and negative poles of the voltage of the information processing module are connected in parallel with the positive and negative poles of the DC power supply module. The positive and negative poles of the DC power supply module are connected to the positive and negative poles of the connection gun base, and the connection gun base is used for detachably connecting to the output interface of the DC charging pile. An energy recovery terminal is provided on the energy feedback module, and the information processing module is used for detecting the output current and output voltage of the DC charging pile, and for adjusting the voltage of the energy recovery terminal. The energy recovery terminal includes an inverter unit, a DC-DC conversion unit, a measurement unit, and a balancing unit; the input end of the DC-DC conversion unit is connected to the DC power supply module, the output end of the DC-DC conversion unit is connected to the input end of the inverter unit, and the output end of the inverter unit is detachably connected to the power supply grid. The measurement unit is used for measuring the current and voltage in the inverter unit and the DC-DC conversion unit. When the measurement result of the measurement unit is in an unbalanced state, the balancing unit is used for stabilizing the voltage corresponding to the output end of the DC-DC conversion unit to the target voltage based on the adjustment instruction of the information processing module and for performing current compensation on the power devices of the inverter unit; the adjustment instruction includes target voltage information; the unbalanced state includes that the voltage at the output end of the DC-DC conversion unit is inconsistent with the target voltage, or the voltage phase at the output end of the inverter unit is inconsistent with the grid voltage phase, or the current phase at the output end of the inverter unit is inconsistent with the grid current phase. The positive and negative poles of the connection port are connected in parallel with the positive and negative poles of the DC power supply module. The connection port is used for detachably connecting to the test system of another DC charging pile. In the case of a test system with multiple parallel DC charging piles, the output current of the single energy feedback module can be adjusted in sequence based on the maximum conversion power of the single energy feedback module, and the adjustment sequence is determined based on the identification code identifier corresponding to the test system of each DC charging pile. The energy feedback module is detachably arranged on the test system of the DC charging pile through a pluggable terminal socket.

2. The test system of the DC charging pile according to claim 1, characterized in that It also includes a protection element, and the protection element is arranged at the positive output end of the connection gun base.

3. The test system for the DC charging pile according to claim 1, characterized in that, It also includes a shunt, the information processing module includes a current detection unit, and the shunt is connected to the current detection unit.

4. The test system for the DC charging pile according to claim 1, characterized in that, The information processing module includes a controller, a first resistor group, and a second resistor group; both the first resistor group and the second resistor group include a plurality of resistors connected in parallel. The first resistor group is arranged at the positive input end of the controller, and the second resistor group is arranged at the negative output end of the controller.

5. The test system for the DC charging pile according to claim 1, characterized in that, A first switch is provided at the positive input end of the DC power supply module, and a second switch is provided at the negative output end of the DC power supply module. The information processing module is also used for controlling the on-off states of the first switch and the second switch.

6. The test system for the DC charging pile according to claim 1, wherein The information processing module further includes an information input unit, and the information input unit is used to receive a test instruction for the DC charging pile.

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