Consider the table after the line scene and the charging pile voltage detection system and method of real car interaction

Abstract

The present application belongs to the technical field of electric vehicle charging pile detection, and particularly relates to a charging pile voltage detection system and method considering post-table line scenarios and real vehicle interaction. The system comprises a line characteristic simulation module for simulating the equivalent impedance of post-table lines under different lengths, materials and temperatures; a load characteristic simulation module for simulating the charging load characteristics of electric vehicles; an external charging pile interface module for connecting real electric vehicles to realize real vehicle charging test; a control analysis module for calculating the impedance value of the current line; and further for selecting one of the load characteristic simulation module and the external charging pile interface module to realize voltage testing of the charging pile under test in the form of simulated charging or real vehicle charging. The present application realizes bidirectional compatibility of simulation test and real vehicle test, accurately calculates the target impedance value based on the built-in impedance-length coupling mapping algorithm, and widens the simulation scenarios and improves the efficient switching and testing accuracy of the simulation scenarios.

Description

Technical Field

[0001] This invention belongs to the field of electric vehicle charging pile testing technology, and particularly relates to a charging pile voltage testing system and method that takes into account the post-meter line scenario and actual vehicle interaction. Background Technology

[0002] With the rapid increase in the popularity of electric vehicles, the demand for charging pile installation has exploded. In actual installation scenarios, due to factors such as the difference in location between the user's residence and the meter box, and building layout restrictions, many charging piles have excessively long cables after the meter. Long cables after the meter will cause a significant voltage drop due to the AC impedance of the conductor (including resistance loss and inductive voltage drop). Especially when the charging pile is running at full load, the constant power load characteristics will further amplify the voltage drop effect, which may cause the charging point voltage to fall below the safe threshold, leading to safety hazards such as decreased charging efficiency, charging interruption, equipment overheating, and even electrical fires.

[0003] However, existing charging pile testing technologies and equipment do not yet have a good solution to the above problems and have many technical shortcomings:

[0004] (1) Most devices do not consider the long-distance back line scenario, do not set the corresponding simulation variables in the detection device, and often only use pure resistance to simulate the wire impedance, ignoring the inductive effect under AC.

[0005] (2) The load simulation is simple and cannot reproduce the real charging dynamics.

[0006] In addition, existing charging pile testing technologies and equipment lack the ability to interact with real electric vehicles, resulting in discrepancies between simulated test results and actual working conditions, and insufficient accuracy and persuasiveness. Summary of the Invention

[0007] To overcome the shortcomings of the prior art, this invention provides a charging pile voltage detection system and method that considers the post-meter line scenario and real vehicle interaction, constructs a "simulation-real vehicle" dual-mode test system, realizes bidirectional compatibility between simulation test and real vehicle test, accurately calculates the target impedance value based on the built-in impedance-length coupling mapping algorithm, broadens the simulation scenario, improves the efficiency of switching between simulation scenarios and the accuracy of test.

[0008] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions:

[0009] The first aspect of the present invention provides a charging pile voltage detection system that takes into account the scenario of the meter line and the interaction with the actual vehicle.

[0010] A charging pile voltage detection system considering post-meter line scenarios and real-vehicle interaction includes:

[0011] The line characteristic simulation module is used to simulate the equivalent impedance of the top-mounted line with different lengths, materials, and temperatures.

[0012] The load characteristic simulation module is used to simulate the charging load characteristics of electric vehicles;

[0013] An external charging pile interface module is used to connect to real electric vehicles to achieve real vehicle charging tests.

[0014] The control and analysis module is used to receive external input, calculate the impedance value of the current line, and control the line characteristic simulation module to output the target impedance value; it is also used to select one of the load characteristic simulation module and the external charging pile interface module to perform voltage testing on the charging pile under test in the form of simulated charging or actual vehicle charging.

[0015] As an optional technical solution, the line characteristic simulation module specifically includes:

[0016] An RL impedance simulation network composed of a programmable resistor array and a programmable inductor array connected in parallel;

[0017] The conductor material matching unit has a built-in database of impedance parameters per unit length for different materials.

[0018] Temperature compensation unit is used to dynamically correct the parameters of the RL impedance simulation network according to the ambient temperature;

[0019] Impedance calibration unit is used to calibrate analog impedance in real time using a standard impedance source.

[0020] As an optional technical solution, the load characteristic simulation module is a high-precision programmable electronic load that supports switching between constant current, constant power, constant resistance, and constant voltage working modes, and has the function of simulating harmonic injection.

[0021] As an optional technical solution, the external charging pile interface module includes:

[0022] Multi-standard compatible interface unit, including multiple charging interfaces;

[0023] The protocol parsing unit is used to parse control guidance signals and vehicle communication protocols during the charging process in real time.

[0024] The safety locking unit employs a dual mechanism of mechanical locking and electronic interlocking to achieve locking between the actual electric vehicle and the charging interface;

[0025] The signal switching unit is used to transmit the actual electric vehicle charging signal to the control and analysis module.

[0026] As an optional technical solution, the control and analysis module is used to receive external input and calculate the impedance value of the current line, specifically including:

[0027] The control and analysis module receives external input of line parameters, including the current line length and conductor material;

[0028] The control analysis module calculates the impedance value of the current line based on the built-in impedance-length coupling mapping algorithm, combined with the current line length and conductor material.

[0029] Specifically, the impedance-length coupling mapping algorithm is as follows:

[0030] Divide the length of the line after the table into multiple intervals;

[0031] A nonlinear fitting equation is established based on the conductor material parameters and temperature coupling coefficient to calculate the target impedance value.

[0032] As an optional technical solution, the control analysis module is also used for:

[0033] The built-in voltage compliance dual-layer judgment algorithm is used to judge the compliance of the test result data of the charging pile under test.

[0034] The test results data include the full-load voltage value and voltage fluctuation amplitude during simulated charging or actual vehicle charging.

[0035] The voltage compliance two-layer determination algorithm specifically includes:

[0036] The first-level determination is based on whether the absolute value of the full-load voltage is lower than a first set value of the rated voltage or higher than a second set value of the rated voltage.

[0037] The second layer of judgment is based on whether the voltage fluctuation exceeds the third set value or whether charging interruption or protocol interaction failure occurs during actual vehicle testing.

[0038] As alternative technical solutions, the following also include:

[0039] The data acquisition module is used to collect electrical parameter data from the input terminals of the line characteristic simulation module, the load characteristic simulation module, and the output terminal of the external charging pile interface module.

[0040] The human-computer interaction module is used for parameter setting, command input, and result display.

[0041] The safety protection module is used to implement overcurrent, overvoltage, leakage current, and overtemperature protection.

[0042] The second aspect of the present invention provides a charging pile voltage detection method that takes into account the scenario of the meter back line and the actual vehicle interaction.

[0043] The charging pile voltage detection method, considering the post-meter line scenario and actual vehicle interaction, includes the following steps:

[0044] The equivalent impedance of the top-mounted line with different lengths, materials, and temperatures is simulated using the line characteristic simulation module.

[0045] The charging load characteristics of electric vehicles are simulated using a load characteristic simulation module.

[0046] By connecting to a real electric vehicle through an external charging pile interface module, real vehicle charging tests can be achieved.

[0047] The control and analysis module receives external input, calculates the impedance value of the current line, controls the line characteristic simulation module to output the target impedance value, and selects one of the load characteristic simulation module and the external charging pile interface module to perform voltage testing on the charging pile under test in the form of simulated charging or actual vehicle charging.

[0048] A third aspect of the present invention provides a computer-readable storage medium having a program stored thereon, which, when executed by a processor, implements the steps in the charging pile voltage detection method considering the behind-the-line scenario and real-vehicle interaction as described in the second aspect of the present invention.

[0049] The fourth aspect of the present invention provides an electronic device, including a memory, a processor, and a program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps in the charging pile voltage detection method considering the after-sales scenario and real-vehicle interaction as described in the second aspect of the present invention.

[0050] The above one or more technical solutions have the following beneficial effects:

[0051] This invention provides a charging pile voltage detection system and method that considers the charging line scenario and real-vehicle interaction. It accurately simulates the AC impedance characteristics of the charging line through an RL impedance coupling model and temperature compensation technology, uses a programmable electronic load to simulate the load, and enables direct connection to a real electric vehicle via an external charging pile interface module. Combined with high-precision data acquisition and fusion analysis algorithms, it achieves accurate detection and real-vehicle verification of the charging point voltage. This method constructs a dual-mode "simulation-real-vehicle" testing system, achieving bidirectional compatibility between simulation and real-vehicle testing. Based on a built-in impedance-length coupling mapping algorithm, it accurately calculates the target impedance value, solving the problems of existing equipment such as limited simulation scenarios, insufficient measurement accuracy, lack of real-vehicle interaction capabilities, and weak persuasiveness of test results, thus ensuring charging safety and stability.

[0052] This invention pioneers an impedance-length coupling mapping algorithm and a temperature compensation model, combining an RL impedance simulation network with precise calibration technology to achieve high-precision simulation of the AC impedance characteristics of the meter's back line. The impedance simulation error is ≤ ±0.5%, and the voltage measurement accuracy reaches 0.01V, significantly improving the detection accuracy.

[0053] This invention enables seamless switching between load characteristic simulation and real vehicle testing, with a load adjustment range of 0-12kW. It supports dynamic load fluctuations, can reproduce the complex working conditions of electric vehicle charging, and is adaptable to the testing needs of various charging piles and electric vehicles, making it highly versatile.

[0054] This invention integrates multi-dimensional safety protection mechanisms and pre-verification functions, including interface safety protection, overcurrent, overvoltage, leakage current, and overtemperature protection, to comprehensively ensure the safety of testing personnel, equipment, and electric vehicles, and avoid potential safety hazards during the testing process.

[0055] This invention incorporates multiple intelligent data processing algorithms to achieve in-depth fusion analysis of multi-source data, comparative verification of real vehicle data and simulated data, supports massive data storage, automatic report generation and cloud uploading, and improves detection efficiency and data management convenience.

[0056] The device of this invention is highly integrated, compact, and easy to operate, making it suitable for on-site work. It is applicable to different user groups such as power departments, installation companies, and testing institutions, and can be widely used in scenarios such as private charging pile installation and testing, and public charging station operation and maintenance testing, with broad application prospects.

[0057] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0058] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0059] Figure 1 This is a system structure diagram of Example 1.

[0060] Figure 2 This is a schematic diagram of the line characteristic simulation module in Example 1.

[0061] Figure 3 This is a flowchart of the method in Example 2. Detailed Implementation

[0062] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0063] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations of the present invention.

[0064] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0065] Example 1

[0066] This embodiment discloses a charging pile voltage detection system that considers both the post-meter wiring scenario and real-vehicle interaction. It is suitable for voltage compliance testing during the charging pile installation process, particularly for voltage drop verification, charging safety assessment, and real-vehicle interaction testing in scenarios with long post-meter wiring. By constructing a dual-mode "simulation-real-vehicle" testing system, a multi-dimensional collaborative simulation model, and intelligent analysis algorithms, it achieves accurate detection and real-vehicle verification of the charging point voltage, providing more convincing scientific evidence for charging pile installation compliance verification. This system solves the problems of existing equipment, such as limited simulation scenarios, insufficient measurement accuracy, lack of real-vehicle interaction capabilities, and weak persuasiveness of test results, thus ensuring charging safety and stability.

[0067] like Figure 1 As shown, a charging pile voltage detection system considering the post-charging line scenario and real-vehicle interaction includes:

[0068] The line characteristic simulation module is used to simulate the equivalent impedance of the top-mounted line with different lengths, materials, and temperatures.

[0069] The load characteristic simulation module is used to simulate the charging load characteristics of electric vehicles;

[0070] An external charging pile interface module is used to connect to real electric vehicles to achieve real vehicle charging tests.

[0071] The control and analysis module is used to receive external input, calculate the impedance value of the current line, and control the line characteristic simulation module to output the target impedance value; it is also used to select one of the load characteristic simulation module and the external charging pile interface module to perform voltage testing on the charging pile under test in the form of simulated charging or actual vehicle charging.

[0072] Furthermore, the system provided in this embodiment also includes a data acquisition module, a human-computer interaction module, and a security protection module. The interconnections and functions of these modules are as follows:

[0073] The line characteristic simulation module is used to simulate the equivalent impedance of the top-mounted line with different lengths, materials, and temperatures.

[0074] A load characteristic simulation module, electrically connected to the line characteristic simulation module, is used to simulate the charging load characteristics of electric vehicles;

[0075] An external charging pile interface module is electrically connected to the line characteristic simulation module and is used to connect to a real electric vehicle to realize real vehicle charging test.

[0076] The data acquisition module is used to collect electrical parameter data from the input terminals of the line characteristic simulation module, the load characteristic simulation module, and the output terminal of the external charging pile interface module.

[0077] The control and analysis module is electrically connected to the line characteristic simulation module, load characteristic simulation module, external charging pile interface module and data acquisition module, respectively. It is used to control the coordinated work of each module, process and analyze the acquired data, and output the detection results.

[0078] The human-computer interaction module is connected to the control and analysis module and is used for parameter setting, command input and result display.

[0079] The safety protection module is connected to the control and analysis module and each power circuit, and is used to implement overcurrent, overvoltage, leakage current and overtemperature protection.

[0080] Figure 1 This is a schematic diagram of the module connection of the device of the present invention. The diagram clearly shows the connection relationship of the seven modules, highlighting the signal interaction logic between the external charging pile interface module, the control and analysis module, and the data acquisition module. Each module forms a closed loop through the circuit. The control and analysis module is the core control unit and establishes a bidirectional signal transmission channel with other modules. The core functions and signal flow of each module are marked.

[0081] Furthermore, the line characteristic simulation module includes:

[0082] An RL impedance simulation network composed of a programmable resistor array and a programmable inductor array connected in parallel;

[0083] The conductor material matching unit has a built-in database of impedance parameters per unit length for different materials.

[0084] Temperature compensation unit is used to dynamically correct the parameters of the impedance simulation network according to the ambient temperature;

[0085] Impedance calibration unit is used to calibrate analog impedance in real time using a standard impedance source.

[0086] Figure 2 This is a schematic diagram of the internal structure of the circuit characteristic simulation module of the present invention. The diagram shows the internal connection logic of the RL impedance simulation network, the conductor material adaptation unit, the temperature compensation unit, and the impedance calibration unit. The resistor array and the inductor array are connected in parallel to form the core impedance simulation unit. The conductor material database, the temperature sensor, and the standard impedance source provide parameter inputs to each functional unit, and finally, the corrected equivalent impedance signal is output through the signal integration module.

[0087] Furthermore, the control and analysis module receives external input and calculates the impedance value of the current line, specifically including:

[0088] The control and analysis module receives external input of line parameters, including the current line length and conductor material;

[0089] The control analysis module calculates the impedance value of the current line based on the built-in impedance-length coupling mapping algorithm, combined with the current line length and conductor material.

[0090] The control analysis module incorporates an impedance-length coupling mapping algorithm. This algorithm divides the length of the back wire from 0 to 300 meters into two intervals and establishes a nonlinear fitting equation based on the conductor material parameters and temperature coupling coefficient to control the output target impedance value of the RL impedance simulation network.

[0091] The specific step 1: Segmentation and interval division and basic parameter calling.

[0092] Based on the nonlinear relationship between the line length and impedance characteristics, the 0-300m length is divided into two segments, and each segment uses an independent fitting model to improve the simulation accuracy of short length segments (≤100m).

[0093]

[0094] Basic parameter retrieval: The control and analysis module retrieves the unit length parameters for the corresponding material from the built-in conductor material database. An example is shown below (at a reference temperature of 20℃):

[0095]

[0096] Step 2: Preliminary calculation of AC resistance and inductance. Based on the segmented intervals and basic parameters, calculate the preliminary values ​​of AC resistance and inductance for the lines following the table. The core is to introduce coupling terms such as temperature and skin effect to correct the deviation of the traditional DC resistance model.

[0097] (1) AC resistance R ac calculate.

[0098] The AC resistance needs to be adjusted by adding temperature correction and skin effect correction, as shown in the following formula:

[0099]

[0100] Meaning of each parameter:

[0101] DC resistance per unit length (Ω / km) at a reference temperature of 20℃, retrieved from the database;

[0102] The length of the target line (km) needs to be converted to kilometers.

[0103] Temperature coefficient of resistance (1 / ℃) varies with material;

[0104] Skin effect coefficient (1 / m): The longer the length and the higher the frequency, the more significant the skin effect and the larger the correction term.

[0105] The thermal stability temperature of the conductor (°C) is determined by the ambient temperature. The temperature of a 10mm² copper wire is approximately 15-20°C higher than the ambient temperature under a 7kW load.

[0106] (2) Calculation of inductance L.

[0107] An inductance consists of internal inductance (the magnetic field inside the conductor) and external inductance (the magnetic field outside the conductor), as shown in the following formula:

[0108] Meaning of each parameter:

[0109] : Inductance per unit length (mH / km), retrieved from the database;

[0110] Piecewise correction functions use different expressions depending on the interval:

[0111] Interval 1 (0-100m): =1+0.002*Lset (The external magnetic field is incomplete in the short segment, and the inductance needs to be enhanced and corrected).

[0112] Section 2 (100-300m): =1 (linear relationship, no correction).

[0113] Step 3: Segmented coupling fitting and initial impedance value output.

[0114] To ensure that the theoretical values ​​calculated in steps 1 and 2 better reflect actual working conditions, and to guarantee that the impedance values ​​output by the algorithm conform to physical laws while meeting the accuracy and practicality requirements of the charging pile's meter-based line detection, a corresponding fitting model is used to modify the preliminary calculations. Coupled with L, initial output impedance value is obtained. ;

[0115] (1) Interval 1 (0-100m): quadratic nonlinear fitting.

[0116] Because the impedance of a short segment exhibits a non-linear relationship with its length (inductance accounts for 30%-50%), a quadratic fitting model is adopted:

[0117]

[0118] Fit coefficients , , , , , The results were obtained through calibration using experimental data (example: 10mm² copper cable). =0.00002, =1.72, =0.01);

[0119] The fitting error is ≤ ±0.3%, and the coefficients are periodically calibrated and updated using a standard impedance source.

[0120] , The resistance and inductance values ​​for the fitted short segment.

[0121] (2) Interval 2 (100-300m): Linear + temperature correction fitting.

[0122] Length and impedance are approximately linear, but the effect of temperature on resistance needs to be coupled separately:

[0123]

[0124] Temperature correction item This is a core coupling term; for example, at 25°C, the temperature correction term for copper conductors is approximately 1.0197. =25℃, =0.00393).

[0125] , The values ​​of resistance and inductance for the fitted non-short length segment are given.

[0126] Step 4: Impedance calibration and error correction

[0127] By connecting a standard impedance source through an impedance calibration unit, the initial impedance value of the fitted output is... Perform real-time calibration to correct deviations between model assumptions and actual cables:

[0128] Calibration process

[0129] 1. Standard impedance connection: The control and analysis module controls the relay array to connect the standard impedance source. (e.g. 1) The resistor and 0.1mH inductor are connected to the RL impedance simulation network;

[0130] 2. Error Calculation: Acquire the actual output impedance of the analog network. Calculation error Z= ;

[0131] Correction coefficient generation: If ΔZ > 0.5%, generate the correction coefficient. The initial impedance value is corrected.

[0132] Correction formula

[0133]

[0134] Calibration frequency: Automatic calibration once per test initiation, or manual calibration triggered by the user;

[0135] Calibration error control: The corrected impedance simulation error is ≤ ±0.5%, which meets the accuracy requirements for charging pile testing (voltage measurement accuracy ≤ 0.01V).

[0136] It can be understood that step two is to calculate the theoretical value, which is the initial calculation process; step three is to use the theoretical initial value calculated in step two to determine the parameters such as abcdef of the independent fitting model, so that the system can directly output the impedance value by using the independent fitting model with determined parameters in the later stage; step four corrects the output value, thereby achieving a more accurate calculation.

[0137] Furthermore, the load characteristic simulation module is a high-precision programmable electronic load that supports switching between constant current, constant power, constant resistance, and constant voltage operating modes, with a load adjustment range of 0-12kW, and can simulate harmonic injection.

[0138] Furthermore, the external charging pile interface module includes:

[0139] Multi-standard compatible interface unit, supporting mainstream charging interfaces such as GB / T 18487.1;

[0140] The protocol parsing unit is used to parse control guidance signals and vehicle communication protocols during the charging process in real time.

[0141] The safety locking unit employs a dual mechanism of mechanical locking and electronic interlocking.

[0142] The signal switching unit is used to synchronously transmit the actual vehicle charging signal to the control and analysis module.

[0143] The safety locking unit employs a dual mechanism of mechanical locking and electronic interlocking to achieve locking between the actual electric vehicle and the charging interface.

[0144] Furthermore, the control analysis module is also used for:

[0145] The built-in voltage compliance dual-layer judgment algorithm is used to judge the compliance of the voltage test results data on the side of the charging pile under test.

[0146] The voltage test results data of the charging pile under test include the full-load voltage value and voltage fluctuation amplitude during simulated charging or actual vehicle charging.

[0147] The voltage compliance two-layer determination algorithm specifically includes:

[0148] The first-level determination is based on whether the absolute value of the full-load voltage is lower than a first set value of the rated voltage or higher than a second set value of the rated voltage.

[0149] The second layer of judgment is based on whether the voltage fluctuation exceeds the third set value or whether charging interruption or protocol interaction failure occurs during actual vehicle testing.

[0150] In this embodiment, the voltage compliance two-layer judgment algorithm is specifically set as follows:

[0151] The first level of judgment is based on whether the absolute value of the full-load voltage is lower than 90% of the rated voltage or higher than 110% of the rated voltage;

[0152] The second layer of judgment is based on whether the voltage fluctuation exceeds ±2V or whether there is a charging interruption or protocol interaction failure during the actual vehicle test.

[0153] This embodiment includes a line characteristic simulation module, a load characteristic simulation module, a data acquisition module, a control analysis module, a human-machine interaction module, a safety protection module, and an external charging pile interface module. It accurately simulates the AC impedance characteristics of the line after the meter through the RL impedance coupling model and temperature compensation technology, uses a programmable electronic load to realize load simulation, and uses the external charging pile interface module to realize the direct access of real electric vehicles. Combined with high-precision data acquisition and fusion analysis algorithms, it realizes accurate detection of charging point voltage and real vehicle verification.

[0154] This method achieves bidirectional compatibility between simulation testing and real vehicle testing through steps such as mode selection, parameter configuration, impedance simulation and calibration, load matching and interface adaptation, data acquisition, analysis and judgment, and result output. It solves the problems of existing equipment having a single simulation scenario, insufficient measurement accuracy, lack of real vehicle interaction capability, and weak persuasiveness of test results. It is suitable for voltage compliance testing before charging pile installation, ensuring charging safety and stability.

[0155] The embodiments of the present invention will be further described below in conjunction with specific implementation scenarios:

[0156] 1. Test preparation:

[0157] Place the device next to the power supply in the meter box, and reliably connect the device's input terminal to the charging pile's output terminal using a dedicated test lead, ensuring that the wiring is secure and the grounding is good; turn on the device's power supply and perform a self-test to confirm that each module is working properly.

[0158] 2. Mode selection and parameter configuration:

[0159] If on-site testing conditions are available, select "Real Vehicle Testing Mode" via the touchscreen display and set the testing parameters:

[0160] The meter has a 80-meter rear cable, is made of copper, has a safe voltage threshold of 200V, is compatible with the charging protocol GB / T18487.1, has a sampling interval of 100ms, and a data acquisition time of 5 minutes.

[0161] 3. Impedance simulation and calibration:

[0162] The control and analysis module calls the unit length resistance (0.0172Ω / km) and inductance (0.5mH / km) parameters of copper material, and combines them with the ambient temperature of 25℃ collected by the temperature acquisition unit. The equivalent impedance value of the 80-meter meter back line (resistance 1.376Ω, inductance 0.04mH) is calculated through the impedance-length coupling mapping algorithm, and the RL impedance simulation network is adjusted to the corresponding impedance.

[0163] The impedance calibration unit started real-time calibration, and the calibration result showed an impedance error of 0.2%, which meets the accuracy requirements.

[0164] 4. Interface adaptation and pre-verification:

[0165] Connect the AC charging gun of a certain brand of electric vehicle to the GB / T 18487.1 external interface of the device, and the safety locking unit completes mechanical locking and electronic interlocking;

[0166] The protocol parsing unit initiates the GB / T 18487.1 protocol handshake and performs a 30-second pre-verification to verify that the interface connection is reliable, the protocol is properly adapted, and the insulation resistance is ≥5MΩ, thus meeting the test requirements.

[0167] 5. Data Acquisition:

[0168] The data acquisition module first collects and stores the open-circuit voltage of 220.8V and the ambient temperature of 25.2℃;

[0169] The actual vehicle charging process was then initiated, and the electric vehicle entered normal charging mode. The data acquisition module simultaneously collected data on full-load voltage, charging current, and wire simulated temperature within 5 minutes.

[0170] 6. Data Processing and Analysis:

[0171] The control analysis module corrects the voltage value using a temperature correction algorithm;

[0172] The calculated average full-load voltage is 214.2V, the voltage drop is 6.6V, and the voltage drop percentage is 2.99%.

[0173] Based on the dual-layer judgment logic, if the full-load voltage is higher than the safety threshold of 200V, the fluctuation range is ±0.4V≤±2V, and the protocol interaction is normal and uninterrupted during the actual vehicle charging process, the test is deemed qualified.

[0174] Simultaneously generate comparison curves between simulated parameters and real vehicle data, showing a consistency deviation of ≤0.5%.

[0175] 7. Results Output and Data Export:

[0176] The touch screen displays the test results, the actual vehicle charging status, and the comparative analysis results in real time. If the result is deemed satisfactory, there will be no alarm information.

[0177] Example 2

[0178] This embodiment discloses a charging pile voltage detection method that considers the scenario of the meter back line and the interaction with the actual vehicle.

[0179] The charging pile voltage detection method, considering the post-meter line scenario and actual vehicle interaction, includes the following steps:

[0180] The equivalent impedance of the top-mounted line with different lengths, materials, and temperatures is simulated using the line characteristic simulation module.

[0181] The charging load characteristics of electric vehicles are simulated using a load characteristic simulation module.

[0182] By connecting to a real electric vehicle through an external charging pile interface module, real vehicle charging tests can be achieved.

[0183] The control and analysis module receives external input, calculates the impedance value of the current line, controls the line characteristic simulation module to output the target impedance value, and selects one of the load characteristic simulation module and the external charging pile interface module to perform voltage testing on the charging pile under test in the form of simulated charging or actual vehicle charging.

[0184] Specifically, the following steps are included:

[0185] S1: Mode Selection and Parameter Configuration:

[0186] Select either the simulation test mode or the real vehicle test mode through the human-machine interaction module, and configure the table post-line parameters, load parameters or charging protocol;

[0187] S2: Impedance Simulation and Calibration

[0188] The control and analysis module controls the line characteristic simulation module to output the corresponding equivalent impedance according to the configuration parameters, and starts the calibration.

[0189] S3: Load matching or interface adaptation:

[0190] In simulation test mode, the load characteristic simulation module applies simulated load; in real vehicle test mode, the external charging pile interface module is controlled to complete the adaptation with the real electric vehicle.

[0191] S4: Data Acquisition

[0192] Collect voltage, current, and temperature data under no-load and full-load conditions, and simultaneously collect charging protocol interaction data in real vehicle test mode;

[0193] S5: Data Processing and Analysis

[0194] The collected data is used to generate detection conclusions based on a compliance assessment algorithm.

[0195] S6: Result Output and Protection:

[0196] The system displays the detection results in real time, and if an abnormal operating condition is detected, it triggers the safety protection module.

[0197] In the real-vehicle test mode of step S3, an interface adaptation pre-verification process is also included:

[0198] Before conducting formal testing, a 30-second protocol handshake and security check is performed to verify the interface connection reliability, protocol compatibility, and insulation status.

[0199] It also includes a simulation-real vehicle comparison test process:

[0200] Under the same table and line parameters, simulation tests and real vehicle tests are performed successively, and the control analysis module automatically compares the two sets of test data to generate a consistency analysis report.

[0201] Figure 3 This is a flowchart illustrating the workflow of the detection method of the present invention. The flowchart presents the complete working process of the simulation test mode and the real vehicle test mode, clearly defining the parameter configuration, core steps, data interaction and switching logic of the two modes, and marking the sequence of each step, core operations and handling mechanisms under abnormal conditions.

[0202] Example 3

[0203] The purpose of this embodiment is to provide a computer-readable storage medium.

[0204] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps in the charging pile voltage detection method considering the after-line scenario and real-vehicle interaction as described in Embodiment 2 of this disclosure.

[0205] Example 4

[0206] The purpose of this embodiment is to provide an electronic device.

[0207] An electronic device includes a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, it implements the steps in the charging pile voltage detection method considering the after-sales scenario and real-vehicle interaction as described in Embodiment 2 of this disclosure.

[0208] The steps and methods involved in the apparatuses of Embodiments 2, 3, and 4 above correspond to those in Embodiment 1. For specific implementation details, please refer to the relevant description section of Embodiment 1. The term "computer-readable storage medium" should be understood as a single medium or multiple media including one or more instruction sets; it should also be understood as including any medium capable of storing, encoding, or carrying an instruction set for execution by a processor and enabling the processor to perform any of the methods in this invention.

[0209] Those skilled in the art will understand that the modules or steps of the present invention described above can be implemented using general-purpose computer devices. Optionally, they can be implemented using computer-executable program code, thereby allowing them to be stored in a storage device for execution by a computer device, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. The present invention is not limited to any particular combination of hardware and software.

[0210] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A charging pile voltage detection system considering the post-meter line scenario and real-vehicle interaction, characterized in that, include: The line characteristic simulation module is used to simulate the equivalent impedance of the top-mounted line with different lengths, materials, and temperatures. The load characteristic simulation module is used to simulate the charging load characteristics of electric vehicles; An external charging pile interface module is used to connect to real electric vehicles to achieve real vehicle charging tests. The control and analysis module is used to receive external input, calculate the impedance value of the current line, and control the line characteristic simulation module to output the target impedance value. It is also used to select one of the load characteristic simulation module and the external charging pile interface module to perform voltage testing on the charging pile under test in the form of simulated charging or actual vehicle charging.

2. The charging pile voltage detection system considering the post-meter line scenario and actual vehicle interaction as described in claim 1, characterized in that, The line characteristic simulation module specifically includes: An RL impedance simulation network composed of a programmable resistor array and a programmable inductor array connected in parallel; The conductor material matching unit has a built-in database of impedance parameters per unit length for different materials. Temperature compensation unit is used to dynamically correct the parameters of the RL impedance simulation network according to the ambient temperature; Impedance calibration unit is used to calibrate analog impedance in real time using a standard impedance source.

3. The charging pile voltage detection system considering the post-meter line scenario and actual vehicle interaction as described in claim 1, characterized in that, The load characteristic simulation module is a high-precision programmable electronic load that supports switching between constant current, constant power, constant resistance, and constant voltage operating modes, and has the function of simulating harmonic injection.

4. The charging pile voltage detection system considering the post-meter line scenario and actual vehicle interaction as described in claim 1, characterized in that, The external charging pile interface module includes: Multi-standard compatible interface unit, including multiple charging interfaces; The protocol parsing unit is used to parse control guidance signals and vehicle communication protocols during the charging process in real time. The safety locking unit employs a dual mechanism of mechanical locking and electronic interlocking to achieve locking between the actual electric vehicle and the charging interface; The signal switching unit is used to transmit the actual electric vehicle charging signal to the control and analysis module.

5. The charging pile voltage detection system considering the post-meter line scenario and actual vehicle interaction as described in claim 1, characterized in that, The control and analysis module receives external input and calculates the impedance value of the current line, specifically including: The control and analysis module receives external input of line parameters, including the current line length and conductor material; The control analysis module calculates the impedance value of the current line based on the built-in impedance-length coupling mapping algorithm, combined with the current line length and conductor material. Specifically, the impedance-length coupling mapping algorithm is as follows: The current route is divided into two sections, namely the first section and the second section, and at least one of the two sections has a short length of ≤100 meters. Call the pre-determined independent fitting models for short and non-short segments; By combining the lengths of the first and second intervals, and using an independent fitting model, the impedance values ​​of the first and second intervals of the current line are calculated. The fitted impedance value is calibrated in real time to correct the deviation between the model assumptions and the actual cable. The specific method for determining the independent fitting model for both short and non-short length segments is as follows: For short segments, a quadratic nonlinear fitting model is used for modeling; for long segments, a linear fitting model combined with a temperature correction term is used for modeling. The initial theoretical impedance values ​​for both the short-length and non-short-length segments are calculated. Based on these initial theoretical impedance values, the parameters of two independent fitting models are determined.

6. The charging pile voltage detection system considering the post-meter line scenario and actual vehicle interaction as described in claim 1, characterized in that, The control analysis module is also used for: The built-in voltage compliance dual-layer judgment algorithm is used to judge the compliance of the test result data of the charging pile under test. The test results data include the full-load voltage value and voltage fluctuation amplitude during simulated charging or actual vehicle charging. The voltage compliance two-layer determination algorithm specifically includes: The first-level determination is based on whether the absolute value of the full-load voltage is lower than a first set value of the rated voltage or higher than a second set value of the rated voltage. The second layer of judgment is based on whether the voltage fluctuation exceeds the third set value or whether charging interruption or protocol interaction failure occurs during actual vehicle testing.

7. The charging pile voltage detection system considering the post-meter line scenario and actual vehicle interaction as described in claim 1, characterized in that, Also includes: The data acquisition module is used to collect electrical parameter data from the input terminals of the line characteristic simulation module, the load characteristic simulation module, and the output terminal of the external charging pile interface module. The human-computer interaction module is used for parameter setting, command input, and result display. The safety protection module is used to implement overcurrent, overvoltage, leakage current, and overtemperature protection.

8. A charging pile voltage detection method considering the post-meter line scenario and actual vehicle interaction, characterized in that, Includes the following steps: The equivalent impedance of the top-mounted line with different lengths, materials, and temperatures is simulated using the line characteristic simulation module. The charging load characteristics of electric vehicles are simulated using a load characteristic simulation module. By connecting to a real electric vehicle through an external charging pile interface module, real vehicle charging tests can be achieved. The control and analysis module receives external input, calculates the impedance value of the current line, controls the line characteristic simulation module to output the target impedance value, and selects one of the load characteristic simulation module and the external charging pile interface module to perform voltage testing on the charging pile under test in the form of simulated charging or actual vehicle charging.

9. A computer-readable storage medium having a program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps in the charging pile voltage detection method as described in claim 8, which considers the scenario of the rear line and the interaction between the vehicle and the charging pile.

10. An electronic device comprising a memory, a processor, and a program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps in the charging pile voltage detection method as described in claim 8, which considers the scenario of the rear-line and the interaction between the vehicle and the charging pile.

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