A phase control method, device, system and storage medium for zero-front opening phase control for zero-loss deep current limiting

Abstract

The present invention provides a zero-front opening phase control method, device, system and storage medium for zero-loss deep current limiting, based on the collected real-time current value of the switch branch, by judging whether the switch branch appears Short-circuit fault, obtain the real-time short-circuit current value and the corresponding time of the short-circuit current value when the current of the switch branch has a short-circuit fault, and obtain the corresponding time by performing linear fitting on the short-circuit current value and the corresponding time of the short-circuit current value The short-circuit current waveform fitting curve, through the short-circuit current waveform fitting curve, predict the first zero moment or the second zero moment of the fault current, and control the vacuum circuit breaker at the first zero moment Open before or before the second zero hour.

Description

technical field [0001] The invention belongs to the technical field of power grid safety, and relates to a zero-front opening phase control method, equipment, system and storage medium for zero-loss deep current limiting. Background technique [0002] With the continuous expansion of the power system capacity, the short-circuit current exceeds the standard more and more seriously, which may lead to exceeding the maximum breaking capacity of the circuit breaker equipment, which seriously threatens the safety of the power grid and power equipment. In order to solve the above problems, there are currently two solutions, one is to replace the circuit breaker with a larger breaking capacity, and the other is to use current limiting technology to limit the excessive short-circuit current, but to replace the circuit breaker with a larger breaking capacity, because of its manufacturing The cost is high, uneconomical, and difficult to popularize and apply. [0003] Current limiting ...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a zero-front opening phase control method for zero-loss deep current limiting, which solves the problem of long duration of short-circuit current, increased adverse effects of fault current on equipment impact and relatively low requirements for vacuum circuit breaker contacts. high technical issues

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