Direct current charging pile test system

Abstract

The utility model discloses a DC charging pile test system, and belongs to the technical field of electric power. The DC charging pile test system provided by the utility model comprises an AC source, a multifunctional gun insertion tool, and feedback loads with adjustable channel loads. A plurality of branches are arranged in the multifunctional gun inserting tool, each branch corresponds to a charging gun of the direct-current charging pile, the branches are mutually independent, the input end of each branch is provided with a plurality of electrical interfaces meeting different standards, the direct-current side of the feedback load is provided with multiple channels, and the direct-current side of the feedback load is provided with multiple channels. Therefore, the test system of the scheme can test various types of DC charging piles at the same time, and the test efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power, and in particular to a DC charging pile testing system. Background Art

[0002] In existing technology, DC charging piles typically require multiple tests, including temperature rise testing, safety testing, finished product batch aging testing, and other factory tests. Current testing methods primarily utilize two approaches: One is to independently test each charging pile with a resistive load; the other is to connect multiple charging piles in parallel to a large resistive load for centralized testing.

[0003] However, the above testing method has the following problems:

[0004] 1. Increased equipment and site costs: As the number of charging piles increases, the number of required loads also increases, leading to higher equipment purchase and site occupation costs.

[0005] 2. Inconvenient operation and low efficiency: During the test process, the method of controlling the start and stop of each load one by one is usually adopted, which makes the operation complicated and inefficient.

[0006] 3. Serious power consumption: During the test, a large amount of power is consumed by the resistive load, which not only increases energy consumption but also generates a large amount of heat, affecting the test progress and test results.

[0007] 4. Increased safety risks: High current testing places higher demands on the upper switch and its incoming line. Otherwise, overload may easily cause the line to burn out or trip, causing serious economic losses to the manufacturer.

[0008] To address these issues, a solution has emerged in recent years: using a regenerative load to replace the traditional resistive load. This solution reduces energy waste by feeding most of the electrical energy generated during the test back to the grid.

[0009] However, existing test systems using feedback loads still have limitations, such as insufficient test flexibility: current test systems can usually only test the same type of charging guns at the same time and cannot support simultaneous testing of multiple types of charging guns, limiting test flexibility and efficiency.

[0010] In response to the above problems, the present invention proposes an improved testing method and system, aiming to solve the problems existing in the prior art, such as high equipment cost, inconvenient operation, low efficiency, severe power consumption and insufficient testing flexibility. Utility Model Content

[0011] In view of the above problems in the prior art, the present invention provides a DC charging pile testing system.

[0012] The technical solution of the utility model is: to provide a DC charging pile test system, the DC charging pile test system includes an AC source, a multifunctional plug gun tooling, and a feedback load;

[0013] The AC input end of the DC charging pile is connected to the output end of the AC source;

[0014] The multifunctional gun insertion tool has multiple branches, and the input end of each branch is provided with multiple electrical interfaces meeting different standards;

[0015] The feedback load has multiple DC input channels; the load corresponding to the DC input channels can be dynamically adjusted;

[0016] The gun line of the DC charging pile is connected to the input end of the branch in a one-to-one correspondence; the output end of the branch is connected to the DC input channel of the feedback load in a one-to-one correspondence;

[0017] The AC output end of the feedback load is connected to the output end of the AC power supply.

[0018] Preferably, the DC charging pile testing system further includes a quick plug interface, and the AC input end of the DC charging pile is connected to the output end of the AC source through the quick plug interface.

[0019] Preferably, the multifunctional gun inserting tool adopts a rack-type multi-position structure, and the input end of each branch is arranged on the outer surface of the multifunctional gun inserting tool.

[0020] Preferably, the electrical interface includes a high-current gun mount, and the types of the gun mount include national standard, European standard, American standard, Tesla standard, and Japanese standard.

[0021] Preferably, the multifunctional plug gun tooling includes an EV simulator connector, a voltage and current acquisition device, a DC contactor, a control panel, and a monitoring screen; each of the branches is equipped with the EV simulator connector, the control panel, the voltage and current acquisition device, and the DC contactor; the control panel is connected to the EV simulation connector, the voltage and current acquisition device, and the DC contactor; one end of the DC contactor is connected to the charging gun head of the DC charging pile, and the other end is connected to the DC input channel of the feedback load; the EV simulation connector is connected to the signal line of the charging gun line; the control panel is used to control the acquisition of voltage and current, communicate with the EV simulator connector, and control the on and off of the DC contactor; the EV simulator connector is used to exchange information with the DC charging pile; the monitoring screen and the control panel are used to monitor and control the operating status of the multifunctional plug gun tooling; the voltage and current acquisition device is used to detect the charging voltage and current, and the auxiliary power supply voltage and current.

[0022] Preferably, the feedback load includes an inverter module and a transformer; the input end of the inverter module is connected to the DC input channel, the output end of the inverter module is connected to the input end of the transformer, and the output end of the transformer is connected to the output end of the AC power supply.

[0023] Preferably, the DC charging pile test system further includes a host computer, which is connected to the feedback load and is used to perform channel configuration and working mode configuration on the feedback load and monitor the operating status of the feedback load.

[0024] Preferably, the AC source includes a filtering circuit, a voltage stabilizing circuit, a voltage regulating circuit, a frequency modulation circuit, and a human-computer interaction interface; the filtering circuit, the voltage stabilizing circuit, the voltage regulating circuit, and the frequency modulation circuit are used to process the input AC power to simulate grid fluctuations; the human-computer interaction interface is used to control the operating parameters of the AC source.

[0025] The present invention has the following beneficial effects: The DC charging pile testing system provided by the present invention includes an AC source, a multifunctional plug-in fixture, and a feedback load with adjustable loads for each channel. The multifunctional plug-in fixture is equipped with multiple branches, each corresponding to a charging plug of the DC charging pile. Each branch is independent of each other, and the input end of each branch is equipped with multiple electrical interfaces that meet different standards. The feedback load has multiple channels on the DC side. Therefore, the testing system of this solution can test multiple types of DC charging piles simultaneously, improving testing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a block diagram of a DC charging pile test system provided in an embodiment of the present utility model.

[0027] Figure 2 This is a schematic structural diagram of a multifunctional gun inserting tool provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0028] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings.

[0029] The utility model is suitable for performing temperature rise test, aging test and other tests on DC charging piles.

[0030] like Figure 1 As shown, an embodiment of the present invention provides a DC charging pile test system, which includes an AC source, a multifunctional plug tool, and a feedback load.

[0031] In an embodiment of the utility model, the AC source includes a filtering circuit, a voltage stabilizing circuit, a voltage regulating circuit, a frequency modulation circuit, and a human-computer interaction interface; the filtering circuit, the voltage stabilizing circuit, the voltage regulating circuit, and the frequency modulation circuit are used to process the input AC power to simulate power grid fluctuations; the human-computer interaction interface is used to control the operating parameters of the AC source.

[0032] The AC input of the AC source is connected to the grid, introducing grid energy into the test system. During DC charging station testing, it's necessary to simulate grid voltage and frequency disturbances, as well as three-phase imbalance. In practice, the AC source's human-machine interface allows you to set the desired operating conditions, such as a ±10% grid voltage fluctuation and a 60Hz US power frequency.

[0033] The AC input end of the DC charging pile is connected to the output end of the AC source.

[0034] The present invention has no specific restrictions on the connection method between the AC input terminal of the DC charging pile and the output terminal of the AC source, as long as the connection interface is safe and convenient. In some embodiments of the present invention, the AC input terminal of the DC charging pile is connected to the output terminal of the AC source via a quick-plug interface. When in use, it can be plugged in and unplugged when not in use. This prevents the wiring terminals from being exposed to the outside and reduces laboratory hazards. It also facilitates preparation work before and after testing and improves work efficiency.

[0035] The multifunctional gun plug tool has multiple branches, and the input end of each branch is provided with multiple electrical interfaces that meet different standards; the feedback load has multiple DC input channels; the load corresponding to the DC input channel can be dynamically adjusted; the gun line of the DC charging pile is connected to the input end of the branch in a one-to-one correspondence; the output end of the branch is connected to the DC input channel of the feedback load in a one-to-one correspondence.

[0036] In this embodiment of the utility model, the multifunctional plug-in fixture serves as a bridge between the charging pile and the feedback load. To support different types of DC charging piles and charging guns, the input end of each branch is provided with multiple electrical interfaces that meet different standards. In this embodiment of the utility model, the electrical interface includes a high-current gun holder, and the gun holder types include national standards, European standards, American standards, Tesla standards, and Japanese standards. In addition to ordinary high-current gun holders, a megawatt-class 1500A high-current gun holder is also included to test charging gun types that meet different standards.

[0037] In an embodiment of the present invention, the multifunctional gun plugging tool adopts a rack-type multi-position structure, and the input end of each branch is arranged on the outer surface of the multifunctional gun plugging tool, which is convenient for quickly connecting the gun line of the DC charging pile.

[0038] In an embodiment of the present invention, the multifunctional plug gun tooling includes an EV (Electric Vehicle) simulator connector, a control board, a voltage and current acquisition device, a DC contactor, and a monitoring screen; each of the branches is equipped with the EV simulator connector, the control board, the voltage and current acquisition device, and the DC contactor; the control board is connected to the EV simulation connector, the voltage and current acquisition device, and the DC contactor, one end of the DC contactor is connected to the charging gun head of the DC charging pile, and the other end is connected to the DC input channel of the feedback load; the EV simulation connector is connected to the signal line of the charging gun line; the control board is used to control the acquisition of voltage and current, communicate with the EV simulator connector, and control the on and off of the DC contactor; the EV simulator connector is used to exchange information with the DC charging pile; the monitoring screen and the control board are used to monitor and control the operating status of the multifunctional plug gun tooling; the voltage and current acquisition device is used to detect the charging voltage and current, and the auxiliary power supply voltage and current.

[0039] like Figure 2 The figure shows the structure of the multifunctional gun plug fixture provided by an embodiment of the present invention. The meter is responsible for collecting voltage and current, EVCCn1 and EVCCn2 are EV simulator connectors, HMIn is the human-machine interface, and KMn1 and KMn2 are DC contactors. Schematically, each branch is equipped with three types of gun holders and a fan. The control panel's functions include:

[0040] (1) Communicate with the EV simulator connector, electric meter, and monitoring screen;

[0041] (2) Collect the temperature of the charging gun tip and automatically stop charging when the temperature exceeds a certain limit;

[0042] (3) Control the on and off of the DC contactor, that is, control the charging on and off;

[0043] (4) Collect the voltages before and after the DC contactor, i.e., the gun tip voltage and the DC side voltage of the feedback load, to determine whether the charging pile has output and whether the load voltage setting is correct.

[0044] The monitoring screen displays the charging current, voltage, power, time, charging capacity, gun tip temperature, fan speed, charging records, fault records, etc.

[0045] An EV simulator connector generally refers to a connector used in electric vehicle-related testing and development processes to simulate the behavior of an electric vehicle's power system, charging system, or other key components. In the embodiment of the present utility model, the EV simulator connector used is a charging connector, which is a standard connector for simulating an electric vehicle charging interface. The charging cable of the DC charging pile's gun line includes a DC positive line, a DC negative line, and a signal line. The AC-DC module inside the DC charging pile converts the incoming AC power into DC power, and outputs it to the multi-function gun plug tooling through the DC positive line and the DC negative line. Figure 1 The CP line in the figure is a signal line, and the EV simulator connector communicates with the DC charging pile through the CP line.

[0046] Specifically, the EV simulator connector houses a BMS (Battery Management System). The EV simulator connector exchanges information with the DC charging pile through the BMS, enabling real-time simulation of the battery charging process. This process is monitored and controlled via a monitoring screen. When the DC charging pile's charging plug is connected to the socket on the multi-function plug fixture, the DC charging pile performs connection detection, charging handshakes, configuration, and charging according to the communication protocol between the off-board charger and the BMS. The multi-function plug fixture detects the charging voltage and current, as well as the auxiliary power supply voltage and current. Each DC charging plug corresponds to a branch on the multi-function plug fixture. Each branch is independent and equipped with an EV simulator connector. When the DC charging pile's charging plug is inserted into the socket of the multi-function plug fixture, the EV simulator connector for the corresponding branch automatically detects the connection and establishes communication with the DC charging pile. Each branch of the multi-function plug fixture is connected to the DC input channel of the regenerative load via a DC positive and DC negative line. The DC voltage and current input to each branch are transferred internally by a DC contactor, leaving the output DC voltage and current essentially unchanged from the input.

[0047] In an embodiment of the present invention, the AC output end of the feedback load is connected to the output end of the AC power supply.

[0048] In an embodiment of the present invention, the DC charging pile test system further includes a host computer connected to the regenerative load for configuring the regenerative load's channel and operating mode, and monitoring the regenerative load's operating status. In an embodiment of the present invention, the operating modes include constant voltage, constant current, constant power, constant current and constant voltage, and constant power and constant voltage, to accommodate various testing scenarios.

[0049] In the embodiment of the present invention, the feedback load includes an inverter module and a transformer; the input end of the inverter module is connected to the DC input channel, the output end of the inverter module is connected to the input end of the transformer, and the output end of the transformer is connected to the output end of the AC power supply. Figure 1 As shown, the inverter module is a DC-AC module, which constitutes the load of each channel. The channel configuration can be performed through the upper computer, that is, the number of DC-AC modules corresponding to each channel can be adjusted to meet the testing of batch charging piles, and at the same time, it can also meet the testing of large current working conditions to achieve maximum load utilization efficiency. The use of a feedback load that can dynamically adjust the channel load occupies a small area compared to a one-to-one load. The feedback load feeds most of the electrical energy back to the power grid and only consumes the heat loss part, with low energy consumption and low heat dissipation. Because a loop is formed between the feedback load and the charging pile, the upper switch only needs to bear the current of the loss part and does not pass large current. Therefore, the specifications of the upper switch and the incoming cable are low. For laboratories or factories that have completed power distribution in the early stage, the losses caused by the transformation of the distribution lines can be reduced.

[0050] After being connected via a multi-function plug fixture, the DC charging pile is connected to the DC side of the regenerative load. This DC side has multiple channels to accommodate simultaneous testing of multiple charging plugs. Finally, through internal inverter modules and transformers, DC power is converted to AC power, which is then fed back to the AC source output, forming a loop with the charging pile. This returns most of the test power to the grid, significantly reducing power loss. The regenerative load establishes communication with the host computer, allowing remote control of the regenerative load, channel configuration, and operating mode configuration to meet the needs of different test conditions. The load's operating status is also monitored in real time to ensure the normal output of the charging pile.

[0051] The working principle of the embodiment of the utility model is as follows:

[0052] (1) When a single DC charging pile needs to be tested, configure the feedback load channel on the host computer, connect the AC input of the DC charging pile to the quick-plug interface connected to the AC source output, insert the charging gun into the gun holder of a branch of the multi-function gun fixture, and connect the output of the branch to the DC input channel of the feedback load to meet the corresponding power requirements. If the DC charging pile has multiple charging guns, connect each charging gun in the same way as above. Observe the test status through the monitoring screen of the multi-function gun fixture and the host computer.

[0053] (2) When it is necessary to conduct batch testing on multiple DC charging piles simultaneously, a channel configuration plan for the feedback load is formulated according to the power requirements of each DC charging pile, and the channel configuration of the feedback load is performed on the host computer. The charging guns of all DC charging piles are connected to the test system according to the connection method of a single charging gun. For example, in an embodiment of the present invention, a feedback load with a maximum power of 600KW is equipped in the laboratory, the power of a DC charging pile ranges from 80 to 240KW, and the power of the charging pile is above 480KW. It is necessary to select how to conduct a combined test of multiple DC charging piles or a charging pile and a DC charging pile, and how to distribute the power, based on the power requirements of the DC charging piles and charging piles to be tested.

[0054] (3) When a high current test is required, the channels of the feedback load are merged according to the power requirements, and the merged channels are used for testing.

[0055] The present invention has the following beneficial effects: the DC charging pile test system provided by the present invention includes an AC source, a multifunctional plug gun tooling, and a feedback load with adjustable loads for each channel. The multifunctional plug gun tooling is provided with multiple branches, each branch corresponds to a charging gun of the DC charging pile, and each branch is independent of each other. The input end of each branch is provided with a variety of electrical interfaces that meet different standards, and the DC side of the feedback load has multiple channels. Therefore, the test system of this solution can test various types of DC charging piles at the same time, thereby improving the test efficiency. At the same time, this solution supports large current testing, uses a feedback load with adjustable loads for each channel, occupies a small area, and can feed back most of the electric energy generated in the test to the power grid, reducing the consumption of electric energy, and has low requirements on the specifications of the upper switch and the incoming cable. The AC power supply, the multifunctional plug gun tooling, and the feedback load all have a human-machine interface, which is convenient for setting the working mode and observing the test status.

[0056] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms of deformation without departing from the scope of protection of the purpose of the present invention and the claims, which are all within the protection of the present invention.

Claims

1. A DC charging pile testing system, characterized in that: The DC charging pile test system includes an AC source, a multifunctional plug tooling, and a feedback load; The AC input end of the DC charging pile is connected to the output end of the AC source; The multifunctional gun inserting tool has multiple branches, and the input end of each branch is provided with multiple electrical interfaces meeting different standards; The feedback load has multiple DC input channels; the load corresponding to the DC input channels can be dynamically adjusted; The gun line of the DC charging pile is connected to the input end of the branch in a one-to-one correspondence; the output end of the branch is connected to the DC input channel of the feedback load in a one-to-one correspondence; The AC output end of the feedback load is connected to the output end of the AC source.

2. The DC charging pile test system according to claim 1, characterized in that: The DC charging pile testing system further includes a quick plug-in interface, through which the AC input end of the DC charging pile is connected to the output end of the AC source.

3. The DC charging pile testing system according to claim 1, characterized in that: The multifunctional gun inserting tool adopts a frame-type multi-position structure, and the input end of each branch is arranged on the outer surface of the multifunctional gun inserting tool.

4. The DC charging pile testing system according to claim 1, characterized in that: The electrical interface includes a high-current gun mount, and the types of the gun mount include national standard, European standard, American standard, Tesla standard, and Japanese standard.

5. The DC charging pile testing system according to claim 1, characterized in that: The multifunctional plug-in tooling includes an EV simulator connector, a voltage and current acquisition device, a DC contactor, a control panel, and a monitoring screen; each branch is equipped with the EV simulator connector, the control panel, the voltage and current acquisition device, and the DC contactor; the control panel is connected to the EV simulator connector, the voltage and current acquisition device, and the DC contactor; One end of the DC contactor is connected to the charging gun head of the DC charging pile, and the other end is connected to the DC input channel of the feedback load; the EV simulation connector is connected to the signal line of the charging gun line; the control board is used to control the acquisition of voltage and current, communicate with the EV simulator connector, and control the on and off of the DC contactor; The EV simulator connector is used to exchange information with the DC charging pile; the monitoring screen and control panel are used to monitor and control the operating status of the multi-functional plug-in tooling; the voltage and current acquisition device is used to detect the charging voltage and current, and the auxiliary power supply voltage and current.

6. The DC charging pile testing system according to claim 1, characterized in that: The feedback load includes an inverter module and a transformer; the input end of the inverter module is connected to the DC input channel, the output end of the inverter module is connected to the input end of the transformer, and the output end of the transformer is connected to the output end of the AC source.

7. The DC charging pile testing system according to claim 1, characterized in that: The DC charging pile test system further includes a host computer, which is connected to the feedback load and is used to perform channel configuration and working mode configuration on the feedback load and monitor the operating status of the feedback load.

8. The DC charging pile testing system according to claim 1, characterized in that: The AC source includes a filtering circuit, a voltage stabilizing circuit, a voltage regulating circuit, a frequency modulation circuit, and a human-computer interaction interface; the filtering circuit, the voltage stabilizing circuit, the voltage regulating circuit, and the frequency modulation circuit are used to process the input AC power to simulate grid fluctuations; the human-computer interaction interface is used to control the operating parameters of the AC source.

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