Wiring detection method of alternating current charging pile

Abstract

The invention discloses a wiring detection method for an AC charging pile, and relates to the technical field of charging piles, and the method comprises the following steps: inputting a current value of an A phase, a current value of a B phase and a current value of a C phase into a detection module, and outputting a current unbalance degree and a wiring quality evaluation index through the detection module. The method has the advantages that the current unbalance degree can be accurately calculated by collecting the current data of each phase of the charging pile in real time, the current distribution condition of the charging pile can be accurately reflected, the problem of current unbalance can be found and processed in time, the charging efficiency and the equipment safety are improved, and a continuous voltage sampling mode is adopted, so that the charging efficiency and the equipment safety are improved. According to the method, the influence of instantaneous voltage fluctuation on a measurement result can be eliminated to a certain extent, the stability of the measurement result is improved, high precision can be kept in a voltage fluctuation environment, multiple electrical parameters such as current unbalance degree and voltage effective value can be comprehensively considered, the wiring quality can be comprehensively reflected, and the method has the effect of better practicability.

Description

Technical Field

[0001] The present invention relates to the technical field of charging piles, and in particular to a wiring detection method for an AC charging pile. Background Art

[0002] With the rapid popularization of electric vehicles, AC charging piles, as important charging facilities, are receiving more and more attention for their safety and reliability. During the operation of AC charging piles, the wiring quality directly affects the charging efficiency, safety and equipment life.

[0003] However, the current wiring detection methods may rely more on manual inspection and simple electrical tests, so it may be difficult to comprehensively and accurately evaluate the quality of the wiring. In addition, the existing detection methods may only focus on a single electrical parameter and lack a comprehensive assessment of the wiring quality, making it difficult to fully reflect the wiring status. In addition, the existing detection methods may have certain errors in the calculation of current imbalance, which may lead to the inability to accurately evaluate the current distribution of the charging pile. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for detecting the connection of an AC charging pile, which solves the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for detecting the connection of an AC charging pile, comprising the following detection methods: Step 1: Based on the preparation module, connect the ammeter in series to the three-phase output line of the AC charging pile, and connect the voltmeter in parallel between the phase and neutral lines of the AC charging pile; Step 2: The current value of phase A, the current value of phase B, the current value of phase C, the number of voltage sampling times, and the voltage value of the i-th sampling of the AC charging pile are acquired through the acquisition module, and stored in the memory and then transmitted to the computer; Step 3: Input the current value of phase A, the current value of phase B, the current value of phase C, the number of voltage sampling times, and the voltage value of the i-th sampling into the detection module, and the detection module outputs the current imbalance, the effective value of the voltage, and the wiring quality evaluation index; Step 4: Based on the recording module, the current imbalance, voltage RMS, and wiring quality assessment index are sorted and summarized, and the data changes of the current imbalance, voltage RMS, and wiring quality assessment index are displayed on the display terminal. The management personnel analyze the data and then confirm the wiring problem of the AC charging pile.

[0006] Optionally, the detection module includes: a current imbalance submodule, a voltage submodule, a wiring analysis submodule and a regulation submodule.

[0007] Optionally, the current imbalance submodule processing process is as follows: ; ; in: Refers to the degree of current imbalance; I a Refers to the current value of phase A, I b Refers to the current value of phase B, I c Refers to the current value of phase C; I u Refers to the average value of the three-phase current, I md refers to the maximum current deviation value, and α refers to the adjustment factor of the maximum current deviation value; Refers to the deviation of phase A current from the average current. Refers to the deviation of the B phase current from the average current. Refers to the deviation of the C phase current from the average current; Based on the current value I of phase A a , the current value of phase B I b and the current value of phase C I c , and the average value of the three-phase current I u , and enter the maximum current deviation value I md , output current imbalance IUB.

[0008] Optionally, the voltage submodule processing process is as follows: ; in: VPF refers to the effective value of voltage; Refers to the adjustment coefficient 1, Refers to the adjustment factor of two; Refers to the effective value of voltage not affected by IUB; VPN refers to the voltage sampling times, VPE i Refers to the voltage value of the i-th sampling; The current imbalance IUB and I u The average value of the three-phase current is input, and based on the voltage sampling number VPN and the voltage value VPE of the i-th sampling i , output voltage effective value VPF.

[0009] Optionally, the wiring analysis submodule processes as follows: ; in: ZKM refers to the wiring quality assessment index; ZKQ refers to the target voltage value, a and b refer to weight factor 1 and weight factor 2 respectively; Refers to the deviation between the actual voltage RMS value and the target voltage RMS value; The current imbalance IUB and the voltage effective value VPF are input together, and based on the target voltage value ZKQ, the wiring quality evaluation index ZKM is output.

[0010] Optionally, the control submodule processing process is as follows: first, ; Next, set the loop termination constraints: Constraint 1: The number of iterations is 40; Constraint 2: ,ω can be set to 0.005, or other artificially set values; When any one of the constraints 1 and 2 is satisfied, the loop terminates immediately; in: I anew Refers to the current value of the new A phase, I a Refers to the current value of phase A in the current imbalance submodule; Refers to the size of the current adjustment, Refers to the regulatory factor; ZKM t Refers to the target value for wiring quality assessment; Based on ZKM and target value ZKM for wiring quality assessment t The absolute value of the difference is used as an influencing factor, and the magnitude of the current adjustment is adjusted and regulatory factors To control the new A phase current value I anew The change amplitude of the current is input into the current imbalance submodule, and the current value of phase A I a , to output the new A phase current value I anew , will I anew Replace the current value I of phase A in the current imbalance submodule a , in order to adjust the current imbalance IUB, and terminate the convergence by constraint conditions one and two.

[0011] Optionally, the preparation module uses calibration equipment and insulating protective gear, the insulating protective gear is worn by the management personnel to avoid electric shock, and the calibration equipment is used to calibrate the ammeter and voltmeter.

[0012] Optionally, the acquisition module uses a data collector, which collects the electrical variable data of the ammeter and the voltmeter and stores them in a memory.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention calculates the current imbalance degree IUB through the current imbalance submodule. The calculation of the current imbalance degree IUB can accurately reflect the current distribution of the charging pile, thereby improving charging efficiency and equipment safety. It also promptly detects and handles current imbalance problems to avoid equipment damage and safety hazards caused by long-term imbalance.

[0014] 2. The present invention calculates the voltage effective value VPF through the voltage submodule, which can accurately measure and calculate the voltage effective value and maintain high precision even in an environment with large voltage fluctuations. Through continuous sampling and data processing, this submodule can eliminate the influence of instantaneous voltage fluctuations on the measurement results and improve the stability of the measurement results.

[0015] 3. The present invention calculates the wiring quality evaluation index ZKM through the wiring analysis submodule. The calculation of the wiring quality evaluation index ZKM comprehensively considers multiple electrical parameters such as current imbalance and voltage RMS, thereby comprehensively evaluating the wiring quality of the charging pile and promptly discovering potential safety hazards and performance problems.

[0016] 4. The present invention controls the current value I of phase A by regulating the submodule a Iterative adjustments are made to achieve the purpose of cyclic iteration of the entire system, making the overall system more flexible and adjustable. In addition, when the wiring problem cannot be solved immediately, the three-phase current allocation calculation is achieved through iteration, which can temporarily alleviate the problems caused by poor wiring, such as reducing equipment overheating and energy consumption, which can buy time for subsequent maintenance work. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a flowchart of the steps of the wiring detection method of the AC charging pile; Figure 2 This is a schematic diagram of the overall structure of the wiring detection method of the AC charging pile; Figure 3 Schematic diagram of the detection module. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] This AC charging pile wiring detection method differs from existing AC charging pile wiring detection methods. Existing AC charging pile wiring detection methods often have errors in the calculation of current imbalance, resulting in an inability to accurately assess the current distribution of the charging pile. In environments with large voltage fluctuations, existing methods have difficulty accurately measuring the effective value of voltage, which affects the judgment of wiring quality. Existing detection methods often focus on a single electrical parameter and lack a comprehensive assessment of wiring quality, making it difficult to fully reflect the wiring status. The wiring detection system method of this AC charging pile can accurately reflect the current distribution of the charging pile, promptly discover and deal with current imbalance problems, improve charging efficiency and equipment safety, and combine voltage sensors and voltage RMS calculations to achieve accurate measurement of voltage RMS through continuous sampling and data processing. It can comprehensively reflect the wiring status of the charging pile, promptly discover potential safety hazards and performance problems, and provide strong support for the maintenance and optimization of the charging pile.

[0020] Example 1: Please refer to Figures 1 to 3 This embodiment provides a method for detecting the connection of an AC charging pile, including the following detection methods: Step 1: Based on the preparation module, connect the ammeter in series to the three-phase output line of the AC charging pile, and connect the voltmeter in parallel between the phase and neutral lines of the AC charging pile; Step 2: The current value of phase A, the current value of phase B, the current value of phase C, the number of voltage sampling times, and the voltage value of the i-th sampling of the AC charging pile are acquired through the acquisition module, and stored in the memory and then transmitted to the computer; Step 3: Input the current value of phase A, the current value of phase B, the current value of phase C, the number of voltage sampling times, and the voltage value of the i-th sampling into the detection module, and the detection module outputs the current imbalance, the effective value of the voltage, and the wiring quality evaluation index; Step 4: The recording module collects and summarizes the current imbalance, voltage RMS, and wiring quality assessment index data. The display terminal displays the changes in the current imbalance, voltage RMS, and wiring quality assessment index data. The management personnel analyze the data and then confirm the wiring problems of the AC charging pile. The detection module includes: a current imbalance submodule, a voltage submodule, a wiring analysis submodule and a regulation submodule.

[0021] In this embodiment, the wiring detection method of the AC charging pile forms a comprehensive monitoring system through the joint operation of multiple submodules in the detection module. The current imbalance submodule calculates and evaluates the distribution of three-phase current. The voltage submodule calculates and considers the potential impact of current imbalance on the effective value of voltage. The wiring analysis submodule calculates and takes the two key factors of current and voltage into comprehensive consideration. The calculation of current imbalance IUB can accurately indicate which phase current has deviation, which helps to quickly locate wiring problems. At the same time, the wiring quality assessment index ZKM combines information on current and voltage to more accurately judge the wiring quality and reduce the possibility of misjudgment and missed judgment. At the same time, this detection method can calculate and feedback the current imbalance IUB, voltage effective value VPF and wiring quality assessment index ZKM in real time, which enables operation and maintenance personnel to timely understand the wiring status of the charging pile and take corresponding maintenance measures. By regularly detecting and analyzing these data, managers can predict potential wiring problems and perform preventive maintenance in advance, which helps to reduce equipment downtime caused by wiring failures and improve the reliability and availability of charging piles. This AC charging pile wiring detection method provides strong support for the intelligent operation and maintenance of AC charging piles. Through automated data collection and analysis, operation and maintenance personnel can manage charging pile equipment more efficiently, reduce operation and maintenance costs, and improve operation and maintenance efficiency.

[0022] See also Figures 1 to 3 , the current imbalance submodule processing process is as follows: ; ; in: IUB refers to current unbalance; I a Refers to the current value of phase A, I b Refers to the current value of phase B, I c Refers to the current value of phase C; I u Refers to the average value of the three-phase current, I md refers to the maximum current deviation value, and α refers to the adjustment factor of the maximum current deviation value; Refers to the deviation of phase A current from the average current. Refers to the deviation of the B phase current from the average current. Refers to the deviation of the C phase current from the average current; Based on the current value I of phase A a , the current value of phase B I b and the current value of phase C I c , and the average value of the three-phase current I u, and enter the maximum current deviation value I md , output current imbalance IUB.

[0023] In this embodiment: current imbalance IUB is an important indicator for measuring the uniformity of three-phase current distribution. This submodule can intuitively understand the degree of imbalance of the three-phase current of the charging pile, providing a basis for subsequent fault diagnosis and wiring detection. In AC charging piles, the imbalance of the three-phase current may cause equipment overheating, reduced efficiency, or even damage. Therefore, monitoring current imbalance is of great significance for ensuring the safe operation and extending the service life of the charging pile. Different from the existing technology that may only judge the wiring status by a single phase current or total current, the current imbalance calculation provides more comprehensive and accurate current distribution information, which helps to more accurately locate wiring problems. The calculation result of IUB directly reflects the degree of imbalance of the three-phase current of the charging pile, and is a key indicator for judging whether the wiring is good and whether there are problems such as short circuit or open circuit.

[0024] See also Figures 1 to 3 , the voltage submodule processing process is as follows: ; in: VPN refers to the effective value of voltage; Refers to the adjustment coefficient 1, which is used to control the influence of the current imbalance IUB on the voltage effective value VPF. Refers to the adjustment coefficient 2, the current value of phase A I a Relative to the average value of the three-phase current I u The degree of influence of the deviation on the effective value of voltage; Refers to the unaffected The effective value of the affected voltage; VPN refers to the voltage sampling times, VPE i Refers to the voltage value of the i-th sampling; The current imbalance IUB and I u The average value of the three-phase current is input, and based on the voltage sampling number VPN and the voltage value VPE of the i-th sampling i , output voltage effective value VPF.

[0025] In this embodiment: This submodule reflects that the voltage RMS VPN may be affected by the current imbalance and the current value of phase A The impact of the situation helps to evaluate the stability of voltage under specific conditions. In AC charging piles, voltage stability is crucial to ensure the smooth progress of the charging process. Compared with the method of only measuring the effective value of voltage without considering other factors, this sub-module provides a more comprehensive voltage evaluation method, which has certain reference value in specific application scenarios. The calculation of the effective value of voltage VPN can be used as an auxiliary indicator in wiring detection to help determine whether the voltage is affected by wiring problems. The continuous voltage sampling method can eliminate the influence of instantaneous voltage fluctuations on the measurement results to a certain extent, improve the stability of the measurement results, and thus maintain high accuracy even in a voltage fluctuation environment.

[0026] See also Figures 1 to 3 , the processing process of the wiring analysis submodule is as follows: ; in: ZKM refers to the wiring quality assessment index; ZKQ refers to the target voltage value, a and b refer to weight factors 1 and 2, respectively, which are used to adjust the impact of current imbalance and voltage deviation on the comprehensive evaluation; Refers to the deviation between the actual voltage RMS value and the target voltage RMS value; The current imbalance IUB and the voltage effective value VPF are input together, and based on the target voltage value ZKQ, the wiring quality evaluation index ZKM is output.

[0027] In this embodiment, the wiring quality evaluation index ZKM combines multiple factors to provide a comprehensive evaluation index for the wiring quality of an AC charging pile. In actual applications, the wiring quality of a charging pile is affected by many factors, and a single index often fails to fully reflect its true condition. Therefore, by comprehensively evaluating multiple indicators, the wiring quality of the charging pile can be more accurately judged. Compared with existing methods that rely on a single indicator, such as voltage, for wiring detection, the wiring quality evaluation index ZKM provides a more comprehensive and accurate evaluation result, which helps to more accurately judge the wiring status of the charging pile. The calculation result of the wiring quality evaluation index ZKM directly reflects the wiring quality of the charging pile and is an important basis for determining whether the charging pile is operating normally and whether it requires maintenance or repair. By regularly testing the Q value, potential wiring problems can be discovered and resolved in a timely manner, ensuring the safe operation of the charging pile. In actual use, when the ZKM value is low, a comparison threshold can be set. When the ZKM value is within the range of 0 to 1 and ZKM is less than 5, an alarm can be issued to prompt management personnel to conduct on-site inspection and repair, and the current value of phase A can be adjusted through the control submodule.

[0028] See also Figures 1 to 3 , the processing of the regulation submodule is as follows: first, ; Next, set the loop termination constraints: Constraint 1: The number of iterations is 40; Constraint 2: ,ω=0.005; When any one of the constraints 1 and 2 is satisfied, the loop terminates immediately; in: I anew Refers to the current value of the new A phase, I a Refers to the current value of phase A in the current imbalance submodule; Refers to the size of the current adjustment, is a fixed current adjustment step size, φ refers to the adjustment factor, which is used to control the wiring quality evaluation index ZKM and the current value of phase A I a proportional relationship; ZKM t Refers to the target value for wiring quality assessment; Based on ZKM and target value ZKM for wiring quality assessment t The absolute value of the difference is used as an influencing factor, and the magnitude of the current adjustment is adjusted and the adjustment factor φ to control the new A phase current value I anew The change amplitude of the current is input into the current imbalance submodule, and the current value of phase A I a , to output the new A phase current value I anew , will I anew Replace the current value I of phase A in the current imbalance submodule a , in order to adjust the current imbalance IUB, and terminate the convergence by constraint conditions one and two.

[0029] In this embodiment: First, ZKM t The target value of the wiring quality assessment is also the target value of the comprehensive wiring quality assessment. This value is generally determined according to the design requirements of the system or industry standards. For example, if the wiring quality is very high, then ZKM t It may be close to 1, and the range of the assumed ZKM is 0 to 1; φ is the adjustment factor. The value of this factor determines the sensitivity of the feedback adjustment. The specific value of φ also depends on the system characteristics and design requirements. If the current adjustment needs to be very sensitive, then φ should be a small value. Usually, the value range of φ may be between 0.01 and 1. When the ZKM quality is poor, it usually means that there is some imbalance or problem in the system, such as current imbalance, voltage fluctuation, etc. These problems may cause the efficiency of the charging pile to decrease, energy consumption to increase, and even damage the equipment or cause safety accidents. Therefore, adjust the current value of phase A I a The purpose is to reduce this imbalance and restore the system to a more stable and efficient state. Long-term operation in a state of current imbalance will accelerate the aging and damage of equipment. Adjusting the current distribution of three-phase electricity can protect equipment from unnecessary damage and extend its service life. Current imbalance may also cause safety hazards such as overheating and short circuit. By adjusting the current, these risks can be reduced and the safety of the system can be improved. Through iterative adjustment, the system can more accurately identify and solve wiring problems, thereby improving the accuracy and reliability of detection. When the ZKM quality is poor, it means that there is a problem with the wiring quality of the charging pile, which may be caused by loose wiring, poor contact, impedance mismatch, etc. At this time, it may not be easy to directly locate and solve the wiring problem, or it may take a long time and resources. Therefore, by adjusting the current value I of phase A a Indirectly improve the current balance, which has certain practical significance; When wiring problems cannot be resolved immediately, this iterative approach can temporarily alleviate problems caused by poor wiring, such as reducing equipment overheating and lowering energy consumption. This buys time for subsequent maintenance work and prevents the system from further deteriorating due to prolonged operation in a poor state. In addition, during the process of adjusting the current balance, changes in system parameters and current response can be observed, which helps to further diagnose the specific cause of the wiring problem.

[0030] In the specific implementation process, multiple submodules in this method are used to form a wiring detection system for AC charging piles. a , the current value of phase B I b , the current value of phase C I c and the average value of the three-phase current I u Substitute them into the current imbalance submodule to calculate the current imbalance degree IUB. The calculation of the current imbalance degree IUB accurately reflects the current distribution of the charging pile, improves charging efficiency and equipment safety, and promptly detects and handles current imbalance problems to avoid equipment damage and safety hazards caused by long-term imbalance. By combining the current unbalance IUB and the average value of the three-phase current I uSubstitute them into the voltage submodule to calculate the voltage RMS value VPF. The calculation of the voltage RMS value VPF combines the voltage sensor and the voltage RMS calculation principle to accurately measure and calculate the voltage RMS value. It can maintain high accuracy even in an environment with large voltage fluctuations. Through continuous sampling and data processing, this submodule can eliminate the impact of instantaneous voltage fluctuations on the measurement results and improve the stability of the measurement results. By substituting the current imbalance IUB and the voltage RMS VPF into the wiring analysis submodule, the wiring quality assessment index ZKM is calculated. The calculation of the wiring quality assessment index ZKM comprehensively considers multiple electrical parameters such as current imbalance and voltage RMS to comprehensively evaluate the wiring quality of the charging pile and promptly identify potential safety hazards and performance issues. Based on the current value I of phase A a and the wiring quality evaluation index ZKM are substituted into the control submodule, and the current value I of phase A in the current imbalance submodule is a Perform iterative cycles. When the ZKM quality is poor, it means that there is a problem with the wiring quality of the charging pile. At this time, it may not be easy to directly locate and solve the wiring problem. By adjusting the current value I of phase A a Indirectly improving current balance has certain practical significance. When wiring problems cannot be solved immediately, the three-phase current allocation calculation can be achieved through iteration. This can temporarily alleviate problems caused by poor wiring, such as reducing equipment overheating and energy consumption, which can buy time for subsequent maintenance work. This allows multiple sub-modules to cooperate with each other in calculations, and to perform overall cycles and iterations, so that the overall system has the effect of automatic optimization and updating, and thus better adaptability.

[0031] Example 2: Please refer to Figure 1 、 Figure 2 and Figure 3 In this embodiment, the preparation module uses calibration equipment and insulating protective gear. The insulating protective gear is worn by the management personnel to avoid electric shock. The calibration equipment is used to calibrate the ammeter and voltmeter.

[0032] In this embodiment: calibration equipment is used to calibrate the ammeter and voltmeter to ensure measurement accuracy, and insulating protective gear, such as insulating gloves, insulating boots and insulating clothing, are worn by the management personnel to ensure the safety of the operators, and necessary connecting wires and clamps need to be prepared to connect the measuring equipment to the charging pile, and after wiring, all connections should be carefully checked to ensure that they are firm to avoid loosening or falling off during the measurement process.

[0033] The acquisition module uses a data collector, which collects the electrical variable data of the ammeter and the voltmeter and stores them in a memory.

[0034] In this embodiment, the acquisition module collects relevant data of the electrical variables through a data collector, and summarizes and processes the data based on data processing software for subsequent calculations.

[0035] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for detecting the connection of an AC charging pile, characterized in that: The following detection methods are included: Step 1: Based on the preparation module, connect the ammeter in series to the three-phase output line of the AC charging pile, and connect the voltmeter in parallel between the phase and neutral lines of the AC charging pile; Step 2: The current value of phase A, the current value of phase B, the current value of phase C, the number of voltage sampling times, and the voltage value of the i-th sampling of the AC charging pile are acquired through the acquisition module, and stored in the memory and then transmitted to the computer; Step 3: Input the current value of phase A, the current value of phase B, the current value of phase C, the number of voltage sampling times, and the voltage value of the i-th sampling into the detection module, and the detection module outputs the current imbalance, the effective value of the voltage, and the wiring quality evaluation index; Step 4: Based on the recording module, the current imbalance, voltage RMS, and wiring quality assessment index are sorted and summarized, and the data changes of the current imbalance, voltage RMS, and wiring quality assessment index are displayed on the display terminal. The management personnel analyze the data and then confirm the wiring problem of the AC charging pile.

2. The AC charging pile connection detection method according to claim 1, characterized in that: The detection module includes: Current imbalance submodule, voltage submodule, wiring analysis submodule and regulation submodule.

3. The AC charging pile connection detection method according to claim 2, characterized in that: The current imbalance submodule processing process is as follows: Based on the current value I of phase A a , the current value of phase B I b and the current value of phase C I c , and the average value of the three-phase current I u , and enter the maximum current deviation value I md , the output current imbalance IUB, the specific formula used is as follows: ； ； in: α refers to the adjustment factor of the maximum current deviation value; Refers to the deviation of phase A current from the average current. Refers to the deviation of the B phase current from the average current. Refers to the degree of deviation of the C-phase current from the average current.

4. The AC charging pile connection detection method according to claim 3, characterized in that: The voltage submodule processing process is as follows: The current imbalance IUB and I u The average value of the three-phase current is input, and based on the voltage sampling number VPN and the voltage value VPE of the i-th sampling i , output voltage effective value VPF; ； in: β refers to adjustment coefficient one, γ refers to adjustment coefficient two; Refers to the effective value of the voltage not affected by IUB.

5. The AC charging pile connection detection method according to claim 4, characterized in that: The processing process of the wiring analysis submodule is as follows: The current unbalance IUB and the voltage RMS VPF are input together, and based on the target voltage value ZKQ, the wiring quality evaluation index ZKM is output; ； in: a and b refer to weight factor one and weight factor two, respectively; Refers to the deviation between the actual voltage RMS value and the target voltage RMS value.

6. The AC charging pile connection detection method according to claim 5, characterized in that: The processing process of the regulatory submodule is as follows: first, ; Next, set the loop termination constraints: Constraint 1: The number of iterations is 40; Constraint 2: ,ω is a hyperparameter set artificially; When any one of the constraints 1 and 2 is satisfied, the loop terminates immediately; in: I anew Refers to the current value of the new A phase, I a Refers to the current value of phase A in the current imbalance submodule; Refers to the magnitude of the current adjustment, φ refers to the adjustment factor; ZKM t Refers to the target value for wiring quality assessment; Based on ZKM and target value ZKM for wiring quality assessment t The absolute value of the difference is used as an influencing factor, and the magnitude of the current adjustment is adjusted and the adjustment factor φ to control the new A phase current value I anew The change amplitude of the current is input into the current imbalance submodule, and the current value of phase A I a , to output the new A phase current value I anew , will I anew Replace the current value I of phase A in the current imbalance submodule a , in order to adjust the current imbalance IUB, and terminate the convergence by constraint conditions one and two.

7. The AC charging pile connection detection method according to claim 1, characterized in that: The preparation module uses calibration equipment and insulating protective gear. The insulating protective gear is worn by the management personnel to avoid electric shock. The calibration equipment is used to calibrate the ammeter and voltmeter.

8. The AC charging pile connection detection method according to claim 1, characterized in that: The acquisition module uses a data collector, which collects the electrical variable data of the ammeter and the voltmeter and stores them in a memory.

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