Testing system of direct current charging pile

Abstract

The invention relates to the technical field of charging pile detection, in particular to a test system of a direct current charging pile. The test system comprises a direct-current power supply module, a connecting gun base, an energy feedback module and an information processing module, the positive and negative electrodes of the energy feedback module are connected with the positive and negative electrodes of the direct-current power supply module in parallel, and the voltage positive and negative electrodes of the information processing module are connected with the positive and negative electrodes of the direct-current power supply module in parallel; positive and negative electrodes of the direct-current power supply module are connected with positive and negative electrodes of the connecting gun seat; the connecting gun seat is detachably connected with an output interface of the direct-current charging pile; the energy feedback module is provided with an energy recovery end, and the energy recovery end is used for being detachably connected with a power supply grid of the direct current charging pile. The information processing module is used for detecting the output current and the output voltage of the direct current charging pile and adjusting the voltage of the energy recovery end; by arranging the energy feedback module, the 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] The present application relates to the technical field of charging pile detection, and in particular to a testing 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 accordingly; in the process of putting charging piles into actual use, it is necessary to test the various functions of the charging piles to ensure that the charging piles can be used normally, and before the DC charging piles leave the factory, it is also necessary to perform aging tests on the charging piles; in the prior art, the detection equipment for DC charging piles has the following disadvantages: the electric energy is wasted during the test, resulting in serious energy waste during the test; in addition, during the test, the charging piles will also have reactive power and imbalance problems when lightly loaded. Summary of the invention

[0003] In view of the above-mentioned problems in the prior art, the purpose of the present application is to reduce energy loss and avoid light-load reactive power and imbalance problems by setting an energy feedback module, thereby improving the reliability of the test system.

[0004] In order to solve the above problems, the present application provides a test system for a DC charging pile, including a DC power supply module, a connection gun holder, an energy feedback module and an information processing module. The positive and negative electrodes of the energy feedback module are connected in parallel with the positive and negative electrodes of the DC power module, and the positive and negative electrodes of the voltage of the information processing module are connected in parallel with the positive and negative electrodes of the DC power module; The positive and negative electrodes of the DC power supply module are connected to the positive and negative electrodes of the connecting gun holder, and the connecting gun holder is used to be detachably connected to the output interface of the DC charging pile; The energy feedback module is provided with an energy recovery terminal, and the energy recovery terminal is used to be detachably connected to the power supply grid of the DC charging pile; The information processing module is used to detect the output current and output voltage of the DC charging pile, and to adjust the voltage of the energy recovery end.

[0005] In an embodiment of the present 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; The inverter unit is used to convert direct current into alternating current.

[0006] In the embodiment of the present 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; 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 at both sides of the DC-DC conversion unit.

[0007] In the embodiment of the present application, the energy feedback module further includes a measuring unit and a balancing unit, wherein the measuring 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 result of the measuring unit and the adjustment instruction of the information processing module.

[0008] 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 electrodes of the connection port are connected in parallel with the positive and negative electrodes of the DC power supply module; The connection port is used for detachable connection with a load or a test system of another DC charging pile; In an embodiment of the present application, the test system of the DC charging pile further includes a protection element, which is disposed at the positive output end of the connection gun seat.

[0009] In an 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.

[0010] In the embodiment of the present application, the information processing module includes a controller, a first resistor group and a second resistor group; the first resistor group and the second resistor group each include a plurality of resistors arranged in parallel; The first resistor group is arranged at the positive input terminal of the controller, and the second resistor group is arranged at the negative output terminal of the controller.

[0011] In the embodiment of the present application, the positive input terminal of the DC power supply module is provided with a first switch, and the negative output terminal of the DC power supply module is provided with a second switch; The information processing module is also used to control the opening and closing states of the first switch and the second switch.

[0012] 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 plug-in terminal socket.

[0013] 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.

[0014] Due to the above technical solution, the DC charging pile testing system described in this application has the following beneficial effects: 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 part of the DC power 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 in the DC charging pile testing process; at the same time, by setting the energy feedback module and the information processing module, the voltage of the energy recovery end of the energy feedback module is adjusted to avoid voltage fluctuations, ensuring that the output voltage of the energy feedback module is stable and the phase is accurate, so as to make up for the imbalance and reactive power generated during DC charging operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments or prior art descriptions. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] FIG1 is a schematic diagram of the structure of a test system for a DC charging pile provided in an embodiment of the present application; FIG2 is a schematic diagram of the structure of a DC-DC conversion unit in a test system of a DC charging pile provided in an embodiment of the present application; FIG. 3 is a schematic diagram of the structure of an inverter unit in a test system of a DC charging pile provided in an embodiment of the present application. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0018] The term "one embodiment" or "embodiment" as used herein 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 accompanying drawings, which 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 therefore cannot be understood as a limitation of the present application. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may include one or more of the features explicitly or implicitly. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here.

[0019] Combination Figure 1 , introduces a test system for a DC charging pile provided by an embodiment of the present application, the system comprises a DC power supply module, a connecting gun holder, 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 connecting gun holder, and the connecting gun holder 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 supply grid of 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.

[0020] In an embodiment of the present application, a DC power supply module is used to simulate a vehicle battery pack to determine the output voltage of a DC charging pile; an energy feedback module feeds back most of the DC power of the DC charging pile to the power supply grid of the DC charging pile through an energy recovery terminal; specifically, the voltage value of the DC power supply module is a high-voltage DC power supply of 200-1000V.

[0021] 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.

[0022] In an embodiment of the present application, 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, indicating that the voltage of the energy feedback module is the same as the voltage of the DC power supply module; 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, indicating that the voltage of the information processing module is the same as the voltage 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 connecting gun seat, and the output interface connecting the gun seat and the DC charging pile is detachably connected, indicating that the output voltage of the connecting gun seat is determined based on the voltage of the DC power supply module.

[0023] In a specific embodiment of the present application, when the gun mount 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 DC power output by the DC charging pile includes a first DC power and a second DC power. The first DC power is a DC power used for detection by the information processing module, and the second DC power is a DC power used to feed back to the power supply grid. Specifically, the current of the second DC power is greater than the current of the first DC power; preferably, the current of the second DC power is 10,000 times greater than that of the first DC power.

[0024] In an embodiment of the present application, an energy feedback module connected in parallel with the positive and negative poles of the DC power supply module is provided in the test system of the DC charging pile. Specifically, the energy feedback module can feed back part of the DC power output by the DC charging pile to the power supply grid of the DC charging pile through the energy recovery terminal, thereby reducing the energy loss during the DC charging pile testing process; at the same time, by providing the energy feedback module and the information processing module, the voltage of the energy recovery terminal of the energy feedback module is adjusted to avoid voltage fluctuations, thereby 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.

[0025] In a specific embodiment of the present application, the connecting gun holder is a 250A standard charging gun holder. Specifically, the connecting gun holder has a DC power positive interface DC+, a DC power negative interface DC-, a ground interface PE, a high-speed communication interface S+, a low-speed communication interface S-, a first connection status confirmation interface CC1, a second connection status confirmation interface CC2, a low-voltage auxiliary power positive interface A+, and a low-voltage auxiliary power negative interface A-corresponding loop connection lines, wherein each loop connection line is provided with an on-off function and a parameter collection interface.

[0026] 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 wired communication and / or wireless communication, wherein wired communication includes but is not limited to RS485 communication, Ethernet communication, RS232 communication and USB interface communication.

[0027] In a specific embodiment of the present application, the communication unit in the information processing module may include wireless communication units such as WiFi and Bluetooth.

[0028] In a specific embodiment of the present application, the communication unit may also include an RS485 communication unit, wherein the RS485 communication unit includes a power supply and a signal isolation type transceiver, the signal isolation type transceiver is used to receive and send signals with a target identification, and the RS485 communication unit includes three communication circuits, one of the three communication circuits is used to communicate with a DC power supply module to realize a vehicle battery simulation function; one of the three communication circuits is used to communicate with a connection port to realize communication with an external parallel load; and one of the three communication circuits is used to communicate with an energy feedback module.

[0029] In a specific embodiment of the present application, the communication unit may further include an Ethernet communication unit, which is used to exchange data with a host computer, which may be an electronic device such as a computer or a mobile phone.

[0030] In a specific embodiment of the present application, the communication unit may further include an RS232 communication unit, which is used to output information of the controller in the information processing module to facilitate debugging and verification by the user.

[0031] In a specific embodiment of the present application, the communication unit may further include a USB interface unit, which is used to transmit update information and data records of the controller in the output information processing module.

[0032] 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, thereby realizing the detection of the function, performance and protocol consistency of the DC charging pile; the information processing unit is also used to adjust the voltage at the energy recovery end; the power supply unit is used to power the information processing unit.

[0033] 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.

[0034] In a specific embodiment of the present application, the information processing unit may be a controller.

[0035] In an embodiment of the present 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; the inverter unit is used to convert direct current into alternating current.

[0036] In an embodiment of the present application, an inverter unit is provided at the energy recovery end so that part of the DC current output by the DC output pile flows back to the power supply grid of the DC charging pile through the inverter unit, thereby reducing energy loss during the DC charging pile testing process.

[0037] In an embodiment of the present application, the energy recovery end also includes a DC-DC conversion unit (DC / DC 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 information processing module adjusts the voltage on both sides of the DC-DC conversion unit.

[0038] In a specific embodiment of the present application, the DC-DC conversion unit includes a DC input terminal DC1 and a DC output terminal DC2. The DC input terminal is connected to the positive and negative poles of the connection gun mount, and energy is transferred between the DC input terminal and the DC output terminal through LLC resonant inductance; the DC output terminal is connected to the input terminal of the inverter unit.

[0039] In the embodiment of the present application, by setting up a DC-DC conversion unit, the information processing module can adjust the voltage on both sides of the DC-DC conversion unit, thereby ensuring the voltage stability on the output side of the DC-DC conversion unit, avoiding voltage fluctuations, and ensuring that the output voltage of the energy feedback module is stable and the phase is accurate, so as to compensate for the imbalance and reactive power generated during DC charging.

[0040] refer to 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, wherein Q1 and Q2 are arranged in series to form a first bridge group, Q3 and Q4 are arranged in series to form a second bridge group, the first bridge group and the second bridge group are arranged 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.

[0041] 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, wherein Q5 and Q6 are arranged in series to form a third bridge group, Q7 and Q8 are arranged in series to form a fourth bridge group, the third bridge group and the fourth bridge group are arranged 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.

[0042] 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 unidirectional dual-active bridges. Specifically, 1200V, 75mmΩ silicon carbide can be used.

[0043] In a specific embodiment of the present application, a unidirectional diode D1 is provided between the DC input terminal and the positive electrode connected to the gun mount, and specifically, it may be a silicon carbide diode to ensure unidirectional flow of energy.

[0044] refer to Figure 3 In a specific embodiment of the present application, the inverter unit may adopt a three-level topology (Active Neutral Point Clamped, ANPC). Specifically, the three-level topology includes an A-phase circuit, a B-phase circuit, a C-phase circuit and a neutral point circuit; the A-phase circuit, the B-phase circuit and the C-phase circuit are arranged in parallel at the output end DC2 of the DC-DC conversion unit.

[0045] In a specific embodiment of the present application, taking phase A as an example, the phase A circuit includes four first-type switches and two second-type switches, wherein the frequency of the four first-type switches is higher than the frequency of the second-type switches, the four first-type switches are arranged in series, and after the two second-type switches are arranged in series, they are arranged in parallel with the two middle 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 100Hz, and specifically 650V / 40mΩ field effect transistors can be used, specifically metal oxide semiconductor field effect transistors (Metal-Oxide-Semiconductor Field Effect Transistor, MOSFET); the B-phase circuit and the C-phase circuit are similar to the A-phase circuit, and will not be described in detail here.

[0046] In the specific embodiment of the present application, the output terminal of the A phase circuit is , the output of the B phase circuit is , the output of the C phase circuit is .

[0047] In a specific embodiment of the present application, the maximum conversion power of a single energy feedback module is 10 kW, which reduces the size of components and improves the convenience of the test system.

[0048] 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, increase the power density of energy feedback, and thus improve the convenience of the test system.

[0049] In an embodiment of the present application, the energy feedback module also includes a measuring unit and a balancing unit. The measuring 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 measuring unit and the adjustment instructions of the information processing module.

[0050] In a specific embodiment of the present application, the measuring unit includes a current detection element and a voltage detection element, the energy recovery end also includes a current detection connection port, the current detection connection port 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 an IDC terminal, an Ia0 terminal, an Ia1 terminal, an Ib0 terminal, an Ib1 terminal, an Ic0 terminal and an Ic1 terminal, wherein the IDC terminal is arranged in the DC-DC conversion unit, and the IDC terminal includes I DC1, I DC2, I DC3 and I DC4, Ia0 terminal, Ia1 terminal, Ib0 terminal, Ib1 terminal, Ic0 terminal and Ic1 terminal are arranged in the inverter unit; the voltage detection element is used to detect the voltage of the DC-DC exchange unit input terminal (DC1), the DC-DC exchange unit output terminal (inverter unit input terminal DC2) and the inverter unit output terminal. Specifically, the inverter unit output terminal includes the output terminal of the A phase circuit , output end of phase B circuit And the output end of the C phase circuit .

[0051] In a specific embodiment of the present application, when the voltage at the output end of the DC-DC exchange unit (inverter unit input end DC2) is inconsistent with the target voltage of the regulation 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, the measurement result of the measuring unit is determined to be an unbalanced state.

[0052] In a specific embodiment of the present application, when the measurement result is an unbalanced state, the balancing unit stabilizes the capacitor voltage corresponding to the DC output terminal DC2 to a target voltage based on the adjustment instruction of the information processing module. For example, in a balanced state, the voltage of DC2 is 750V, and in an unbalanced state, the voltage of DC2 is adjusted to a target voltage of 800V; wherein the adjustment instruction includes target voltage information; specifically, the balancing unit can use a 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.

[0053] In a specific embodiment of the present application, a balancing unit is used to perform current compensation on a power device of an inverter unit based on a detection result of a current detection element. Specifically, the balancing unit is used to determine a target compensation current, a target negative sequence, and a target zero sequence based on the detection result of the current detection element and a calculation method for positive and negative zero-sequence currents (for example, a symmetrical component method), and is used to control the power element of the inverter unit to compensate for the current based on the target compensation current, the target negative sequence, and the target zero sequence, wherein the compensation value is the inverse of the target compensation current, the target negative sequence, and the target zero sequence.

[0054] In an embodiment of the present application, the test system of the DC charging pile also includes a connection port, 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 detachable connection with a load or another DC charging pile test system.

[0055] In an embodiment of the present application, by setting a 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 parallel connection of multiple DC charging pile test systems, further avoiding energy waste and reducing energy loss during the DC charging pile testing process.

[0056] In a specific embodiment of the present application, in the case of a test system with multiple DC charging piles 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 order can be determined based on the identification code corresponding to the test system of each DC charging pile.

[0057] In an embodiment of the present application, the test system of the DC charging pile also includes a protection element, which is arranged at the positive output terminal connected to the gun mount.

[0058] In the embodiment of the present application, a protective resistor is provided at the positive output terminal of the connection gun mount, thereby preventing the entire test system from being damaged due to excessive current output of the connection gun mount, thereby improving the reliability of the test system.

[0059] 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 a preset current threshold, the fuse of the fuse breaks to protect the test system and the DC charging pile.

[0060] In an 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.

[0061] 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.

[0062] In the embodiment of the present application, by providing a shunt connected to the current detection unit, the information processing module can perform sampling and analysis on the output current of the DC pile, thereby improving the reliability of the test system.

[0063] In an embodiment of the present application, the information processing module includes a controller, a first resistor group and a second resistor group; the first resistor group and the second resistor group each include a plurality of resistors arranged in parallel; the first resistor group is arranged at the positive input terminal of the controller, and the second resistor group is arranged at the negative output terminal of the controller.

[0064] In an embodiment of the present application, by setting a first resistor group and a second resistor group, the insulation function of the pile end of the DC charging pile can be tested by adopting the principle of an unbalanced bridge. Specifically, the unbalanced bridge indirectly tests the insulation function of the pile end of the DC charging pile by measuring the unbalanced voltage of the bridge.

[0065] 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 insulation function test of the DC charging pile end, the information processing unit is powered by the power supply unit.

[0066] In a specific embodiment of the present application, the controller may adopt an RK3568 processor.

[0067] In other embodiments of the present application, the controller may also use other types of processors.

[0068] In an embodiment of the present application, 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 to control the opening and closing states of the first switch and the second switch.

[0069] In an embodiment of the present application, by setting a first switch and a second switch, access to the DC power supply module is controlled, thereby facilitating the simulation of the vehicle battery voltage or terminating the simulation of the vehicle battery voltage, thereby improving the controllability of the test system.

[0070] In a specific embodiment of the present application, the first switch K5 and the second switch K6 are high-voltage DC contactors.

[0071] 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 plug-in terminal socket.

[0072] In the embodiment of the present application, the energy feedback module is detachably connected by providing a plug-in terminal socket, and the current of the DC charging pile can be selectively fed back to the power grid, thereby improving the testing flexibility of the testing system.

[0073] In the embodiment of the present application, the information processing module also includes an information input unit, which is used to receive a test instruction for the DC charging pile.

[0074] In the embodiment of the present application, an information input unit is provided to facilitate debugging of the test system and selection of test instructions, thereby improving the testing flexibility of the test system for DC charging piles.

[0075] In a specific embodiment of the present application, the information input unit may be a human-computer interaction interface. Preferably, the information input unit may also be used to display test data of a DC charging pile.

[0076] The DC charging pile test system in the embodiment of the present application has the following beneficial effects: 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 part of the DC power 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 in the DC charging pile testing process; at the same time, by setting the energy feedback module and the information processing module, the voltage of the energy recovery end of the energy feedback module is adjusted to avoid voltage fluctuations, ensuring that the output voltage of the energy feedback module is stable and the phase is accurate, so as to make up for the imbalance and reactive power generated during DC charging operation.

[0077] The above description has fully disclosed the specific implementation methods of the present application. It should be pointed out that any changes made by technicians familiar with the field to the specific implementation methods of the present application do not deviate from the scope of the claims of the present application. Accordingly, the scope of the claims of the present application is not limited to the above specific implementation methods.

Claims

1. A DC charging pile test system, characterized in that: It includes a DC power supply module, a gun connection base, an energy feedback module and an information processing module. The positive and negative electrodes of the energy feedback module are connected in parallel with the positive and negative electrodes of the DC power module, and the positive and negative electrodes of the voltage of the information processing module are connected in parallel with the positive and negative electrodes of the DC power module; The positive and negative electrodes of the DC power supply module are connected to the positive and negative electrodes of the connecting gun holder, and the connecting gun holder is used to be detachably connected to the output interface of the DC charging pile; The energy feedback module is provided with an energy recovery terminal, and the energy recovery terminal is used to be detachably connected to the power supply grid of the DC charging pile; The information processing module is used to detect the output current and output voltage of the DC charging pile, and to adjust the voltage of the energy recovery end.

2. The DC charging pile test system according to claim 1, characterized in that: The energy recovery end includes an inverter unit, and 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.

3. The DC charging pile test system according to claim 2, characterized in that: The energy recovery end also includes a DC-DC conversion unit, and 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 information processing module adjusts the voltages at both sides of the DC-DC conversion unit.

4. The DC charging pile test system according to claim 3, characterized in that: The energy feedback module further includes a measuring unit and a balancing unit, wherein the measuring 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 result of the measuring unit and the adjustment instruction of the information processing module.

5. The DC charging pile test system according to claim 1, characterized in that: It also includes a connection port, wherein the positive and negative electrodes of the connection port are connected in parallel with the positive and negative electrodes of the DC power supply module; The connection port is used for detachable connection with a load or a test system of another DC charging pile.

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

7. The DC charging pile test system 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.

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

9. The DC charging pile test system according to claim 1, characterized in that: 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 also used to control the opening and closing states of the first switch and the second switch.

10. The DC charging pile test system according to claim 1, characterized in that: The energy feedback module is detachably arranged on the test system of the DC charging pile via a plug-in terminal socket.

11. The DC charging pile test system according to claim 1, characterized in that: 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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