换流变分接头控制策略与运行分析

Control Strategies and Operational Analysis of Converter Transformer Tap Changer

作为高压直流输电系统控制的基本手段之一,换流变分接头控制对高压直流输电系统的调控起着非常重要的作用,为确保换流变分接头与换流阀触发角α(或逆变器的关断角γ)密切配合,使换流器在最优参数下运行,通过对换流变分接头各种不同控制策略的介绍,并结合一起分接头控制失败案例进行分析,为提高换流变运行可靠性,减少换流变分接头机械故障率,提供了运维方面的建议。

As one of the basic means of HVDC transmission system control,converter transformer tap changer control plays a very important role in the regulation of HVDC transmission System.In order to ensure the close coordination of converter transformer tap changer and converter valve firing angle α （or turn-off angle γ of inverter） to make the converter run under optimal parameters ,this paper describes different control strategies of converter transformer tap changer, analyzes one failed case of tap changer control and provides proposals on operation and maintenance to improve the reliability of converter transformer operation and reduce the technical failure rate of converter transformer tap changer.