A commutation control method and system for a controllable phase commutated converter

Abstract

The present application relates to the technical field of power control, in particular to a commutation control method and system of controllable commutation converter. The present application is a commutation control method of controllable commutation converter, first, the electrical and driving state monitoring data of auxiliary commutation branch are collected, the fault type and fault level result containing one and two type identification are obtained through fault feature identification, then the on-off of main thyristor branch and DC transmission power data are loaded, and the hierarchical fault tolerance protection is executed according to the fault level. One type fault runs at reduced capacity, adjusts the trigger pulse of healthy device and requests power limit as needed; two type fault triggers emergency bypass, locks auxiliary branch, turns on main branch, confirms and switches to traditional thyristor mode, realizes targeted fault tolerance protection of auxiliary branch internal fault. It can solve the problem that the prior art lacks targeted protection for the internal device fault of converter valve auxiliary branch.

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