Charging compatibility test system for electric vehicle and alternating current charging pile

Abstract

The invention relates to a charging compatibility test system for an electric vehicle and an alternating current charging pile. The charging compatibility test system comprises an alternating current power supply, an alternating current guide circuit simulator and a measurement and control system, the testing system has the advantages that electric vehicle testing and alternating current charging pile testing are integrated into one testing system, functions are highly integrated, electric vehicle testing data and charging pile testing data can be from the same source, and unified comparative analysis is facilitated; by organically combining AC charging pile and electric vehicle AC charging interface compatibility test equipment into one set of test system, the compatibility test of the AC charging pile and the electric vehicle AC charging interface is completed at one time, the test equipment is reduced, the equipment reusability is high, and the test efficiency is improved. The compatibility test efficiency of the AC charging pile and the AC charging interface of the electric vehicle is obviously improved; electric vehicle testing and alternating current charging pile testing are integrated into one testing system, unified maintenance and management are facilitated, and the construction cost of the testing system is effectively reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of electric vehicles, and in particular relates to a charging compatibility testing system for electric vehicles and AC charging piles. Background Art

[0002] In October 2020, China released the "New Energy Vehicle Industry Development Plan (2021-2035)", which states that by 2035, China's new energy vehicle ownership will reach about 100 million. The energy of new energy vehicle batteries will reach about 5 billion kWh. If all Chinese passenger cars are converted to electric cars in the future, the on-board energy storage capacity will be roughly equivalent to China's total daily electricity consumption. The total charging and discharging power of on-board battery energy storage applications for 100 million electric cars will reach 2.5 billion to 5 billion kilowatts. The number of electric vehicles and charging piles is growing exponentially.

[0003] Electric vehicles and charging piles interact with each other millions of times every day. During these charging activities, a large number of charging failures and even charging accidents occur. Therefore, charging compatibility testing of charging piles and electric vehicles has become an important task that needs to be solved urgently. In the current existing technology, charging pile and electric vehicle tests are conducted separately, but in actual applications, there are often compatibility issues between electric vehicles and charging piles. According to traditional practices, two different testing devices need to be carried out for testing, which has problems such as inconvenience in carrying, complicated testing process, and non-universal test data. There is an urgent need for a device that can test both electric vehicles and AC charging piles.

[0004] In the existing published patent applications, invention patent application number CN202210903410.1 discloses a ChaoJi electric vehicle simulator, a ChaoJi charging pile compatibility test method and system, wherein the ChaoJi charging pile compatibility test system includes: a ChaoJi charging interface simulation unit, a battery simulation unit, a DC load unit and a battery management system simulation unit; wherein the ChaoJi charging interface simulation unit is used to simulate the ChaoJi control guidance circuit of the electric vehicle, perform interoperability testing on the ChaoJi charging pile under test, and connect the ChaoJi charging pile under test when testing the ChaoJi charging pile under test; the battery simulation unit includes a rectifier The DC output end of the rectifier is used to simulate the battery voltage characteristics of the electric vehicle, and cooperate with the DC load unit to perform a load test on the electrical performance of the ChaoJi charging pile under test; the DC load unit is connected to the ChaoJi charging interface simulation unit, and is used to simulate the battery load characteristics of the electric vehicle, absorb the DC power output by the ChaoJi charging pile under test, and perform a load test on the electrical performance of the ChaoJi charging pile under test; the battery management system simulation unit is used to simulate the battery management system of the electric vehicle, communicate with the ChaoJi charging pile under test through the ChaoJi charging interface simulation unit, and perform a protocol consistency test on the ChaoJi charging pile under test.

[0005] The above patent application still does not provide a charging compatibility testing system for electric vehicles and AC charging piles. Summary of the invention

[0006] The object of the present invention is to provide an electric vehicle and AC charging pile charging compatibility testing system that can overcome the above-mentioned technical problems.

[0007] The electric vehicle and AC charging pile charging compatibility test system of the present invention comprises: an AC power supply, an AC pilot circuit simulator, and a measurement and control system; wherein:

[0008] AC power supply: The AC power supply simulates the power grid and tests the electrical performance of the AC charging pile, and cooperates with the AC pilot circuit simulator to test the interoperability of the AC charging interface of the electric vehicle, simulates the AC load and cooperates with the AC pilot circuit simulator to test the interoperability of the AC charging pile;

[0009] The AC pilot circuit simulator integrates the AC charging pile control pilot circuit and the electric vehicle AC charging control pilot circuit. The AC pilot circuit simulator can simultaneously perform interoperability performance tests on AC charging piles and AC interoperability tests on electric vehicles.

[0010] Measurement and control system: used to collect voltage, current, CC, and CP signals during the test, and provide 8 recording channels. In order to avoid different degrees of interference in the output waveform during the test due to the uneven quality of charging piles, which may cause inaccurate or misjudgment of the time cursor, the charging compatibility host computer test software performs FIR median filtering on the channel waveform data to be analyzed and processed, and optimizes the cursor search algorithm. By presetting the start and end time of the cursor position, presetting the upper and lower limits of the channel waveform data, presetting the cursor direction from left to right / right to left, finding the upper and lower limits of the waveform data and the actual waveform overlapping area, and finding the cursor position of nearby points in / outside the overlapping area that meets the conditions, the hardware function and the own logic function are called to complete the timing control of the integrated hardware.

[0011] Furthermore, the AC power supply parameters are: input AC three-phase 380V, output AC three-phase 380V, and maximum power 45kW.

[0012] Furthermore, the AC power supply can work in both power mode and AC load mode.

[0013] Furthermore, when the AC pilot circuit simulator cooperates with the AC charging interface interoperability test of the electric vehicle, the AC power supply works in the power supply mode and cooperates with the AC pilot circuit simulator to simulate the AC charging pile, forming a system for testing electric vehicles.

[0014] Furthermore, when testing the AC charging pile, the AC power supply works in the AC load mode and cooperates with the AC pilot circuit simulator to simulate the electric vehicle to form an AC charging pile test system.

[0015] Furthermore, the AC pilot circuit simulator has standard charging interfaces: L1, L2, L3, N, PE, CP, CC, which are used for CC open circuit test, CP interruption test, and CP loop boundary voltage value test items; the AC pilot circuit simulator can simulate PWM signals, and the PWM-related test items include: duty cycle change test, PWM duty cycle over-limit test, PWM frequency boundary test, CP loop boundary voltage value test, and CC loop boundary resistance value. The R1, R2, and R3 contained in the AC pilot circuit simulator are electronic potentiometers with an adjustment range of 500-2000Ω and a step size of 0.1Ω. The cable capacity RC resistance simulation circuit can realize 100Ω, 220Ω, 680Ω, and 1.5kΩ equivalent resistance simulation and each resistance upper and lower limit simulation function to meet the simulation of the rated capacity of different charging connection devices. The insulation simulation resistor and the corresponding simulation switch are connected between L1 and PE to simulate the insulation resistance between L1 and PE to reduce, causing the leakage protection of the charging pile under test to take action.

[0016] Furthermore, the AC steering circuit simulator uses an electronic potentiometer to simulate R1, R2, and R3 in the steering circuit, with an adjustment range of 500-2000Ω and a step size of 0.1Ω, so as to achieve compatibility testing of various charging piles and electric vehicles on the market.

[0017] Furthermore, the AC pilot circuit simulator is designed with a grounding resistor, which is connected between CC and PE and between CP and PE to simulate CC and CP grounding faults.

[0018] Furthermore, the measurement and control system is used to collect voltage, current, CC, and CP signals during the test, and provides 8 recording channels. The sampling rate of all channels is ≥10kSa / s to avoid varying degrees of interference in the output waveform during the test due to uneven quality of charging piles, resulting in inaccurate time cursor positioning or misjudgment.

[0019] Furthermore, the measurement and control system completes the timing control of the integrated hardware by invoking hardware functions and own logic functions through a built-in complete conventional electrical performance test and conduction interoperability test program.

[0020] The superior technical effects of the electric vehicle and AC charging pile charging compatibility testing system of the present invention are as follows:

[0021] 1. The electric vehicle and AC charging pile charging compatibility test system of the present invention is used for the compatibility test of AC charging piles and electric vehicle AC charging interfaces, and integrates electric vehicle testing and AC charging pile testing into a set of testing systems with highly integrated functions. It can realize the same source of electric vehicle test data and charging pile test data, which is convenient for unified comparative analysis.

[0022] 2. The electric vehicle and AC charging pile charging compatibility test system of the present invention organically combines the AC charging pile and the electric vehicle AC charging interface compatibility test equipment into a set of test systems. The compatibility test of the AC charging pile and the electric vehicle AC charging interface is completed at one time, which reduces the test equipment, has high equipment reuse, and significantly improves the efficiency of the AC charging pile and electric vehicle AC charging interface compatibility test.

[0023] 3. The electric vehicle and AC charging pile charging compatibility test system of the present invention is used for compatibility test of AC charging piles and electric vehicle AC charging interfaces, integrating electric vehicle testing and AC charging pile testing into a set of testing systems, which is convenient for unified maintenance management and effectively reduces the construction cost of the testing system.

[0024] 4. The circuit structure diagram independently designed by the electric vehicle and AC charging pile charging compatibility test system of the present invention shows that the actual use shows that the operation of the electric vehicle and AC charging pile charging compatibility test is simple and practical, and the test performance data is accurate and reliable, which has wide promotion and use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a topological structure diagram of the AC charging pile of the present invention; the arrow is a schematic diagram of energy flow;

[0026] Figure 2 It is a topological structure diagram of the AC electric vehicle of the present invention; the arrow is a schematic diagram of energy flow;

[0027] Figure 3 It is a working principle diagram of the AC pilot circuit simulator of the present invention. DETAILED DESCRIPTION

[0028] The following is attached to the instruction manual Figure 1-3 The specific implementation of the electric vehicle and AC charging pile charging compatibility testing system of the present invention is described in detail.

[0029] like Figure 1-2 As shown, the electric vehicle and AC charging pile charging compatibility test system includes: an AC power supply, an AC pilot circuit simulator, and a measurement and control system, wherein:

[0030] AC power supply: simulates the power grid and tests the electrical performance of the AC charging pile, cooperates with the AC pilot circuit simulator to test the interoperability of the AC charging interface of the electric vehicle, simulates the AC load and cooperates with the AC pilot circuit simulator to test the interoperability of the AC charging pile; the AC power supply parameters are: input AC three-phase 380V, output AC three-phase 380V, maximum power 45kW, the AC power supply can work in power mode and AC load mode;

[0031] AC pilot circuit simulator: It integrates the AC charging pile control pilot circuit and the electric vehicle AC charging control pilot circuit. The AC pilot circuit simulator can simultaneously test the interoperability performance of the AC charging pile and the AC interoperability test of the electric vehicle. When the AC pilot circuit simulator is used to test the interoperability performance of the AC charging interface of the electric vehicle, the AC power supply works in the power supply mode and cooperates with the AC pilot circuit simulator to simulate the AC charging pile, forming a system for testing electric vehicles. When testing the AC charging pile, the AC power supply works in the AC load mode and cooperates with the AC pilot circuit simulator to simulate the electric vehicle, forming an AC charging pile test system.

[0032] The AC pilot circuit simulator has standard charging interfaces: L1, L2, L3, N, PE, CP, CC, which are used for CC circuit break test, CP interruption test, and CP loop boundary voltage value test items; the AC pilot circuit simulator can simulate PWM signals, and the PWM-related test items include: duty cycle change test, PWM duty cycle over-limit test, PWM frequency boundary test, CP loop boundary voltage value test, and CC loop boundary resistance value. The R1, R2, and R3 contained in the AC pilot circuit simulator are electronic potentiometers with an adjustment range of 500-2000Ω and a step length of 0.1Ω. The cable capacity RC resistance simulation circuit can realize 100Ω, 220Ω, 680Ω, and 1.5kΩ equivalent resistance simulation and each resistance upper and lower limit simulation function, which meets the rated capacity of different charging connection devices. The insulation simulation resistor and the corresponding simulation switch are connected between L1 and PE to simulate the insulation resistance between L1 and PE to reduce, causing the leakage protection of the tested charging pile to operate;

[0033] Measurement and control system: used to collect voltage, current, CC, and CP signals during the test, and provide 8 recording channels. In order to avoid different degrees of interference in the output waveform during the test due to the uneven quality of charging piles, which may cause inaccurate or misjudgment of the time cursor, the charging compatibility host computer test software performs FIR median filtering on the channel waveform data to be analyzed and processed, and optimizes the cursor search algorithm. By presetting the start and end time of the cursor position, presetting the upper and lower limits of the channel waveform data, presetting the cursor direction from left to right / right to left, finding the upper and lower limits of the waveform data and the actual waveform overlapping area, and finding the cursor position of nearby points in / outside the overlapping area that meets the conditions, the hardware function and the own logic function are called to complete the timing control of the integrated hardware.

[0034] As an embodiment of a specific structure of the present invention, the AC power supply parameters are: input AC three-phase 380V, output AC three-phase 380V, and maximum power 45kW.

[0035] As a specific structural embodiment of the present invention, the AC power supply can work in both power supply mode and AC load mode.

[0036] As a specific structural embodiment of the present invention, when the AC pilot circuit simulator cooperates to test the interoperability performance of the AC charging interface of an electric vehicle, the AC power supply works in the power supply mode and cooperates with the AC pilot circuit simulator to simulate the AC charging pile to form a system for testing electric vehicles.

[0037] As a specific structural embodiment of the present invention, when testing the AC charging pile, the AC power supply works in the AC load mode and cooperates with the AC pilot circuit simulator to simulate the electric vehicle to form an AC charging pile test system.

[0038] As an embodiment of a specific structure of the present invention, the AC pilot circuit simulator has standard charging interfaces: L1, L2, L3, N, PE, CP, CC, which are used for CC circuit break test, CP interruption test, and CP loop boundary voltage value test items; the AC pilot circuit simulator can simulate PWM signals, and the PWM-related test items include: duty cycle change test, PWM duty cycle over-limit test, PWM frequency boundary test, CP loop boundary voltage value test, and CC loop boundary resistance value. The R1, R2, and R3 included in the AC pilot circuit simulator are electronic potentiometers with an adjustment range of 500-2000Ω and a step size of 0.1Ω. The cable capacity RC resistance simulation circuit can realize 100Ω, 220Ω, 680Ω, and 1.5kΩ equivalent resistance simulation and each resistance upper and lower limit simulation function, meeting the simulation of the rated capacity of different charging connection devices. The insulation simulation resistor and the corresponding simulation switch are connected between L1 and PE to simulate the insulation resistance between L1 and PE to reduce, causing the leakage protection action of the tested charging pile;

[0039] As an embodiment of a specific structure of the present invention, the AC steering circuit simulator uses an electronic potentiometer to simulate R1, R2, and R3 in the steering circuit, with an adjustment range of 500-2000Ω and a step length of 0.1Ω, so as to achieve compatibility testing of various charging piles and electric vehicles on the market;

[0040] As a specific structural embodiment of the present invention, the AC pilot circuit simulator is provided with a grounding resistor, which is connected between CC and PE, and between CP and PE, to simulate CC and CP grounding faults;

[0041] As an embodiment of a specific structure of the present invention, the measurement and control system is as follows Figure 3 As shown, it is used to control the four-quadrant AC power supply and AC pilot circuit simulator to collect voltage, current, CC, and CP signals during the test process, provide 8 waveform raw data channels, and the sampling rate of all channels is ≥10kSa / s. The measurement and control system has a built-in complete routine electrical performance test and conduction interoperability test program, calls hardware functions and its own logic functions, and completes the timing control of the integrated hardware.

[0042] Below, combined with the instructions attached Figure 3 The working mode of the circuit structure diagram of the electric vehicle and AC charging pile charging compatibility test system of the present invention is briefly introduced.

[0043] like Figure 3 As shown, specifically:

[0044] F1 is the socket interface for AC charging pile testing;

[0045] K3 and K4 are on-off switches. When K7 is disconnected, the AC charging pile of connection mode B can be tested. When K3 and K7 are closed and K4 is disconnected, it is used to test the AC charging pile of connection mode C.

[0046] K5 and S2 are on-off switches, where analog resistors R2 and R3 simulate the CP control guidance signal of the electric vehicle test pile;

[0047] K5 is an on / off switch, which can simulate the disconnection of the CP control guidance signal of the electric vehicle pile test;

[0048] K7 is an on / off switch, which can simulate the disconnection of the PE signal of the electric vehicle test pile;

[0049] K8 is the on / off switch, and R10 circuit is used to simulate CP signal grounding, which is used for AC charging pile CP grounding test;

[0050] CT1 is used to display the AC current waveform and output the signal to a display device such as an oscilloscope through conditioning;

[0051] PT1 is used to display the AC voltage waveform and output the signal to a display device such as an oscilloscope through conditioning;

[0052] The KN switch and R11 circuit are used to simulate leakage and detect whether the leakage protection switch in the AC charging pile functions normally;

[0053] F2 is the power input interface for AC electric vehicle testing;

[0054] L-KM1 is an AC contactor, used to simulate the charging switch of an AC charging pile;

[0055] M-S1: The switch simulates the switch S1 of the AC charging pile and selects between 12VDC and PWM signals;

[0056] N-loop 12Vdc and PWM signal, switches S1 and K1, and analog resistor R1 can simulate the CP control guidance signal of the AC charging pile test vehicle;

[0057] O-switch K1 can simulate the disconnection of the CP control guidance signal of the AC charging pile test vehicle;

[0058] P-loop switches K6, S3, K2, resistors R4, RC, are used to simulate the CC control guidance signal of the AC charging pile test vehicle;

[0059] Q-switch K2 is used to simulate the disconnection of the CC control guidance signal of the AC charging pile test vehicle;

[0060] R-CT2 is used to display the AC current waveform and output the signal to a display device such as an oscilloscope through conditioning;

[0061] S-PT2 is used to display AC voltage waveforms and output signals to display devices such as oscilloscopes through conditioning;

[0062] F3 is the AC load connection port, and the AC power supply works in load simulation mode;

[0063] F4 is the interface of the voltage sampling point, which is used for direct voltage sampling of devices such as power analyzers;

[0064] T: Interface for third-party voltage measurement equipment;

[0065] F5 is the signal output terminal for AC charging pile test or electric vehicle test, which is displayed through oscilloscope, wave recorder and other equipment: such as CP, CC, AC voltage, and AC current signal waveforms of AC charging pile test; such as CP, CC, AC voltage, and AC current signal waveforms of AC electric vehicles; such as the emergency event time mark set inside the software during the test, which is used to calculate the time difference of events occurring at different times;

[0066] F6 is the panel measurement point of the internal analog resistance of the device, where:

[0067] R2 and R3 are the simulated resistors for AC charging pile testing, and R4 and RC are the simulated resistors for AC electric vehicle testing;

[0068] F7 is the equipment power supply and communication interface, among which: RS485 is the communication interface, and the power supply is 220VAC;

[0069] F8 is the charging gun line interface for simulating charging pile testing. The gun end of this interface is defined the same as the AC charging gun, while the device end is customized. It is connected by quick plug and other methods.

[0070] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the scope disclosed in the present invention should be covered by the protection scope of the claims of the present invention.

Claims

1. A charging compatibility test system for electric vehicles and AC charging piles, It is characterized in that include: AC power source, AC pilot circuit simulator, measurement and control system, wherein: AC power supply: The AC power supply simulates the power grid and tests the electrical performance of the AC charging pile, and cooperates with the AC pilot circuit simulator to test the interoperability of the AC charging interface of the electric vehicle, simulates the AC load and cooperates with the AC pilot circuit simulator to test the interoperability of the AC charging pile; The AC pilot circuit simulator integrates the AC charging pile control pilot circuit and the electric vehicle AC charging control pilot circuit. The AC pilot circuit simulator can simultaneously perform interoperability performance tests on AC charging piles and AC interoperability tests on electric vehicles. Measurement and control system: used to collect voltage, current, CC, and CP signals during the test process, provide 8 recording channels, perform FIR median filtering on the channel waveform data to be analyzed and processed through the charging compatibility host computer test software, and optimize the cursor search algorithm. By presetting the start and end time of the cursor position, presetting the upper and lower limits of the channel waveform data, presetting the cursor direction from left to right / right to left, finding the overlapping area of ​​the upper and lower limits of the waveform data and the actual waveform, and finding the cursor position of nearby points in / outside the overlapping area that meets the conditions, the hardware function and the own logic function are called to complete the timing control of the integrated hardware.

2. According to the electric vehicle and AC charging pile charging compatibility testing system of claim 1, It is characterized in that The AC power supply parameters are: input AC three-phase 380V, output AC three-phase 380V, and maximum power 45kW.

3. According to the electric vehicle and AC charging pile charging compatibility testing system of claim 1, It is characterized in that The AC power supply can operate in a power mode and an AC load mode.

4. According to the electric vehicle and AC charging pile charging compatibility testing system of claim 1, It is characterized in that When the AC pilot circuit simulator cooperates with the AC charging interface of the electric vehicle to test the interoperability performance, the AC power supply works in the power supply mode and cooperates with the AC pilot circuit simulator to simulate the AC charging pile to form a system for testing the electric vehicle.

5. According to the electric vehicle and AC charging pile charging compatibility testing system of claim 1, It is characterized in that When testing the AC charging pile, the AC power supply works in the AC load mode and cooperates with the AC pilot circuit simulator to simulate the electric vehicle to form an AC charging pile test system.

6. The electric vehicle and AC charging pile charging compatibility testing system according to claim 1, It is characterized in that The AC pilot circuit simulator has standard charging interfaces: L1, L2, L3, N, PE, CP, CC, which are used for CC open circuit test, CP interruption test, and CP loop boundary voltage value test items; The AC pilot circuit simulator can simulate PWM signals, and the PWM test items include: duty cycle change test, PWM duty cycle over-limit test, PWM frequency boundary test, CP loop boundary voltage value test, CC loop boundary resistance value. The R1, R2, and R3 contained in the AC pilot circuit simulator are electronic potentiometers with an adjustment range of 500-2000Ω and a step size of 0.1Ω. The cable capacity RC resistance simulation circuit can realize 100Ω, 220Ω, 680Ω, 1.5kΩ equivalent resistance simulation and each resistance upper and lower limit simulation function to meet the simulation of the rated capacity of different charging connection devices. The insulation simulation resistor and the corresponding simulation switch are connected between L1 and PE to simulate the insulation resistance between L1 and PE to reduce, causing the leakage protection of the charging pile under test to take action.

7. According to the electric vehicle and AC charging pile charging compatibility testing system of claim 1, It is characterized in that The AC steering circuit simulator uses an electronic potentiometer to simulate R1, R2, and R3 in the steering circuit, with an adjustment range of 500-2000Ω and a step length of 0.1Ω.

8. The electric vehicle and AC charging pile charging compatibility testing system according to claim 1, It is characterized in that The AC pilot circuit simulator is designed with a grounding resistor, which is connected between CC and PE and between CP and PE to simulate CC and CP grounding faults.

9. The electric vehicle and AC charging pile charging compatibility testing system according to claim 1, It is characterized in that The measurement and control system is used to collect voltage, current, CC, and CP signals during the test process, and provides 8 recording channels. The sampling rate of all channels is ≥10kSa / s.

10. The electric vehicle and AC charging pile charging compatibility testing system according to claim 1, It is characterized in that The measurement and control system completes the timing control of the integrated hardware by invoking hardware functions and self-owned logic functions through built-in complete conventional electrical performance test and conduction interoperability test programs.

Images