CN-122025471-A - Zero-crossing control method, system, medium and product of charging pile relay

CN122025471ACN 122025471 ACN122025471 ACN 122025471ACN-122025471-A

Abstract

A charging pile relay zero crossing control method, a system, a medium and a product relate to the field of charging pile relays, in the method, firstly, zero crossing point signals of a charging pile output relay are detected and pre-stored control delay parameters are combined to realize relay action control; aiming at the situation of needing calibration, the optimal calibration delay value is selected from test results to update by calculating two calibration parameters of the first calibration delay and the second calibration delay and sequentially carrying out calibration tests, and failure warning information is timely generated and uploaded to an operation management platform when continuous three times of calibration failure or the calibration delay value exceeds a preset range by monitoring the failure times in the calibration process and the change trend of the calibration delay value. The application realizes the self-adaptive optimization of the zero crossing control of the relay, improves the control precision, establishes a perfect failure early warning mechanism and enhances the reliability and safety of the operation of the charging pile.

Inventors

XU YUNFENG
LI RONGMING
ZHANG XIAOCONG

Assignees

厦门佳因特科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260307

Claims (10)

1. The zero-crossing control method for the charging pile relay is characterized by comprising the following steps of: Detecting a zero crossing point of an output end of the charging pile output relay to obtain a zero crossing point detection signal; Reading a pre-stored zero crossing point control delay parameter T a to obtain a current control delay value; Responding to the zero crossing point detection signal, and controlling the relay to act according to the control delay value T a to obtain the relay action time; Detecting the time difference T b of two adjacent zero crossing points after the relay acts, and calculating to obtain ideal zero crossing interval time according to the output power frequency of the charging pile; Determining whether to perform delay calibration based on a comparison result of the time difference T b and the ideal zero-crossing interval time T delta ; Calculating a first calibration delay T a1 =T a +(T delta -T b ) and a second calibration delay T a2 =T a -T b in response to the calibration trigger signal; performing calibration test by sequentially using the second calibration time delay and the first calibration time delay to obtain a calibration test result; Selecting an effective calibration delay value according to the calibration test result, and updating and storing the effective calibration delay value as a new control delay parameter; monitoring failure times and calibration time delay values in the calibration process, and generating zero-crossing detection failure warning information when the continuous three times of calibration fails or the calibration time delay values exceed a preset threshold value; and uploading the warning information and the calibration record to a charging pile operation management platform through a communication interface.
2. The method of claim 1, wherein prior to detecting a zero crossing of the charging pile output relay output, the method further comprises: Acquiring real-time power data and output voltage waveform data of a charging pile, and analyzing the change trend of the power data; identifying an idle period of the charging pile based on the change trend of the power data, and judging whether the duration of the idle period meets the self-checking execution condition; acquiring a power grid frequency fluctuation range corresponding to the output voltage waveform data, and determining a power grid stable state for executing self-checking; generating a self-checking trigger signal in response to simultaneously satisfying the idle period condition and the grid steady state; And planning a plurality of groups of relay action test sequences in a time-sharing mode according to the self-checking trigger signals.
3. The method according to claim 2, wherein the step of planning a plurality of relay operation test sequences in time periods according to the self-checking trigger signal specifically comprises: determining a reference value of the daily action frequency of the relay according to the historical operation data of the charging pile; setting a test interval duration based on the reference value, and dividing the idle period into a plurality of test time windows; Allocating action test times quota to each test time window to generate a test time sequence table; alternately executing on-off test based on the test time sequence table in each test time window; and monitoring response time and action current of the relay in each test process, and establishing a test record.
4. The method according to claim 1, wherein before the step of determining whether to perform delay calibration based on the comparison of the time difference T b and the ideal zero-crossing interval time T delta , the method further comprises: acquiring the type of a power supply network and load distribution data of an area where the charging pile is located; determining a standard zero crossing point offset range according to the type of the power supply network, and calculating a network impedance change coefficient according to the load distribution data; And dynamically adjusting a judgment threshold value of a comparison result by combining the standard zero crossing point offset range and the network impedance change coefficient, and taking the judgment threshold value as a reference condition of calibration triggering.
5. The method of claim 1, wherein prior to the step of selecting a valid calibration delay value based on the calibration test results, the method further comprises: acquiring action time sequence records and control parameters in a relay calibration test; extracting time delay offset trend characteristics in the action time sequence record, and calculating the association degree of time delay offset and temperature coefficient under different control parameters; Weighting and sequencing the calibration delay values according to the association degree to determine an optimal calibration delay value; and taking the optimal calibration time delay value as an updating reference standard.
6. The method according to claim 5, wherein the step of extracting the delay offset trend feature specifically comprises: acquiring voltage waveform data of the on-off process of the relay in each calibration test, and calculating the phase difference between the zero crossing point and the ideal zero crossing point in the voltage waveform data; counting the distribution characteristics of the phase difference changing along with time, and determining the periodicity rule of the delay offset according to the distribution characteristics; And optimizing the execution time of the calibration test based on the periodicity law.
7. The method of claim 1, wherein prior to the step of monitoring the number of failures in the calibration process and the calibration delay value, the method further comprises: acquiring temperature and humidity data of the running environment of the charging pile and counting the actions of the relay; Calculating time sequence correlation coefficients of the temperature and humidity data and the times of calibration failure; Setting a dynamic early warning threshold according to the association coefficient and the action count, and carrying out grading statistics on the calibration failure times based on the dynamic early warning threshold; and triggering a preventive maintenance flow when the number of calibration failures exceeds an early warning threshold value of a corresponding level.
8. A charging stake relay zero crossing control system, the system comprising: one or more processors and memory coupled with the one or more processors, the memory to store computer program code, the computer program code comprising computer instructions that the one or more processors invoke to cause the system to perform the method of any of claims 1-7.
9. A computer readable storage medium comprising instructions which, when run on a system, cause the system to perform the method of any of claims 1-7.
10. A computer program product, characterized in that the computer program product, when run on a system, causes the system to perform the method according to any of claims 1-7.

Description

Zero-crossing control method, system, medium and product of charging pile relay Technical Field The application belongs to the field of charging pile relays, and particularly relates to a zero crossing control method, a zero crossing control system, a zero crossing control medium and a zero crossing control product for a charging pile relay. Background With the rapid development of new energy automobiles, the reliability and safety requirements of charging infrastructures are continuously improved. The charging pile is used as key equipment for charging a new energy automobile, and the stability of output control of the charging pile directly influences the safety of a charging process and the service life of the charging equipment. In the output control of the charging pile, the zero crossing control of the relay is an important link for guaranteeing safe charging. However, the existing relay zero-crossing control method often adopts fixed control delay parameters, and cannot adapt to the influence caused by power grid fluctuation and load change. In the related art, a simple zero-crossing detection and fixed time delay control scheme is generally adopted, and the scheme can realize a basic zero-crossing control function under ideal working conditions. However, due to complexity of a power supply network and variability of a charging load, a single fixed time delay control strategy is difficult to ensure reliable actions of the relay under various working conditions, and control delay or early actions are easy to cause, so that the use safety of charging equipment is affected. However, the current relay zero crossing control technology lacks a dynamic optimization mechanism for controlling delay parameters, cannot carry out self-adaptive adjustment according to actual running conditions, does not establish a perfect calibration failure early warning mechanism, cannot timely discover and process control abnormality, and needs to be further improved. Disclosure of Invention The application provides a zero-crossing control method of a charging pile relay, which is used for solving the technical problems that in the prior art, the control delay parameter is fixed and a calibration early warning mechanism is lacked. According to the method, through dynamic detection of zero crossing points and combination of a self-adaptive time delay calibration mechanism, accurate control of the action time sequence of the relay is achieved, a perfect failure early warning mechanism is established, and the reliability and safety of operation of the charging pile are improved. In a first aspect, the present application provides a zero-crossing control method for a charging pile relay, including: Detecting a zero crossing point of an output end of the charging pile output relay to obtain a zero crossing point detection signal; Reading a pre-stored zero crossing point control delay parameter T a to obtain a current control delay value; Responding to the zero crossing point detection signal, and controlling the relay to act according to the control delay value T a to obtain the relay action time; Detecting the time difference T b of two adjacent zero crossing points after the relay acts, and calculating to obtain ideal zero crossing interval time according to the output power frequency of the charging pile; Determining whether to perform delay calibration based on a comparison result of the time difference T b and the ideal zero-crossing interval time T delta; Calculating a first calibration delay T a1=Ta+(Tdelta-Tb) and a second calibration delay T a2=Ta-Tb in response to the calibration trigger signal; performing calibration test by sequentially using the second calibration time delay and the first calibration time delay to obtain a calibration test result; Selecting an effective calibration delay value according to the calibration test result, and updating and storing the effective calibration delay value as a new control delay parameter; monitoring failure times and calibration time delay values in the calibration process, and generating zero-crossing detection failure warning information when the continuous three times of calibration fails or the calibration time delay values exceed a preset threshold value; and uploading the warning information and the calibration record to a charging pile operation management platform through a communication interface. In the embodiment, the system firstly detects zero crossing point signals of the charging pile output relay and combines pre-stored control delay parameters to realize relay action control, calculates two calibration parameters of first calibration delay and second calibration delay according to the condition needing to be calibrated, sequentially carries out calibration tests, selects an optimal calibration delay value from test results to update, monitors the failure times in the calibration process and the change trend of the calibration delay value, timely generates fail