Converter station AC filter phase selection closing effect discrimination method based on recording data

Abstract

The invention discloses a converter station AC filter phase selection closing effect discrimination method based on recording data. The method comprises steps 1-16; according to the method, the recording data of phase selection and closing of the alternating current filter completely records the whole dynamic process, and the data quality is superior to that of test parameters obtained through an equipment power failure test. Based on recording data of phase selection and closing of the alternating current filter, the method for discriminating the phase selection and closing effect of the alternating current filter of the converter station is designed. Whether the phase selection closing effect of the alternating current filter meets the requirement, whether the actual closing action time of the circuit breaker deviates from a preset value and whether the control precision of the phase selection closing device meets the requirement are automatically judged, so that maintenance personnel of a converter station can conveniently carry out phase selection closing according to the judgment result of phase selection closing. And the control parameters of the phase selection closing device are dynamically adjusted to correct the discrete characteristics of the circuit breaker equipment. And a checking method and data support are also provided for the control precision of the phase selection closing device.

Description

Technical field [0001] The invention belongs to the technical field of filter phase selection and closing effect judgment, and specifically relates to a method for judging the phase selection and closing effect of an AC filter in a converter station based on wave recording data. Background technique [0002] High-voltage DC converter stations all use phase-selective closing devices to perform phase-selective closing control of the circuit breakers in the AC filters. The phase selection closing device collects the system reference voltage in real time, randomly receives the closing start command from the control system, predicts in advance according to the set circuit breaker closing action time, and controls the exit delay of the closing command to achieve The purpose of controlling the circuit breaker to turn on at the expected target angle is to greatly reduce overcurrent and overvoltage during the transient process of closing operation, extend the life of the equipment an...

AI Technical Summary

Problems solved by technology

This method does not consider the phenomenon of air breakdown caused by high voltage during the actual closing process of the circuit breaker, resulting in inaccurate closing action time obtained from the test;

[0007] (2) On the basis of method (1), select a specific air breakdown model to solve the actual closing action time of the circuit breaker. , humidity, electric field strength and other environmental factors, the accuracy of the calculated closing time is not high

[0008] (3) Use the closing time of the closing stroke contact inside the circuit breaker mechanism (after the dynamic and static trigger of the circuit breaker is in full contact, the closing stroke contact changes from open to closed), as the closing action time of the circuit breaker, because the travel contact itself is closed The speed is slow and the speed of each closing is unstable, and the time accuracy deviation is large

[0010] In addition, when the phase selection closing effect of the AC filter is not good, it is often difficult to distinguish whether the control parameters do not match the operating characteristics of the AC filter, or the control accuracy of the phase selection closing device is degraded, so it is impossible to formulate correct maintenance measures, and it is also impossible to Realize the dynamic adjustment of the phase selection closing effect of the AC filter, which brings safety hazards to the safe and stable operation of the converter station

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