一起换流变分接头失步原因分析

Cause Analysis of Out of Step of Converter Transformer Tap

换流变分接头的控制对于高压直流输电系统的运行起着重要作用,换流变分接头发生失步故障时,将导致换流变三相电压不一致,影响换流变的正常运行,使高压直流系统的输送功率受到限制,对直流输电系统的稳定运行造成严重影响。本文通过对兴仁换流站的一起换流变分接头失步故障原因的深入分析,提出换流变分接头失步的防范措施和故障处理建议,有效的提高了换流变分接头运行的可靠性,减少分接头故障的处理时间,同时也提高了兴安直流系统运行的稳定性。

The control of the commutation variable tap changer plays an important role in the operation of the HVDC transmission system. When the out-of-step fault occurs in the converter,the three-phase voltage of the converter will become inconsistent and affect the normal operation of the converter. DC power transmission system is limited, the stability of the DC transmission system to run a serious impact. In this paper,through the analysis of the cause of out-of-step fault of the commutation variable tap in Xingren converter station,the prevention measures and suggestions of fauh handling are put forward, Reliability, reduce the processing time of tap failure, but also improve the stability of the Xing＇an DC system operation.