贺日星,杨宝峰,陈瀚栋,罗振鹏
HE Rixing,YANG Baofeng,CHEN Handong,LUO Zhenpeng

• 1:内蒙古工业大学电力学院

摘要(Abstract)：

通过剖析换相失败机理，分析发生换相失败的主要原因是基于电网换相换流器的高压直流输电采用的换流元件晶闸管为半控型器件。当关断角小于其固有极限关断角时便会发生换相失败，换相失败会引起换流变压器直流偏磁、换流阀过热、送端电网过压和发电机组脱机等问题，严重情况下可能进一步导致直流闭锁，存在引发大面积停电的风险。整理并总结已有的抑制换相失败的措施，并对这些措施进行分类阐述，一是通过修改控制器定值，二是通过增加额外的组件或设备抑制换相失败，三是进行换流器拓扑局部改造，最后指出了亟待研究的问题，为当前及今后的研究提出可行的技术思路。
By analyzing the mechanism of phase change failure, it is analyzed that the main reason for phase change failure is that the current converter element thyristor used in high-voltage DC transmission based on the grid phase change converter is a semi-controlled device. When the turn-off angle is less than its inherent limit turn-off angle, commutation failure will occur, which will cause the converter transformer DC magnetic bias, converter valve overheating, overvoltage of the power grid at the sending end and the generator set offline and other problems. In serious cases, it may further lead to DC blocking, which may lead to the risk of large-scale power outage. The existing measures to suppress commutation failure are sorted out and summarized, and these measures are classified and described, one is to modify the controller setting, the other is to suppress commutation failure by adding additional components or equipment, the third is to carry out local transformation of converter topology, and finally points out the problems to be studied urgently, and puts forward feasible technical ideas for current and future research.

关键词(KeyWords)： 高压直流输电;换相失败;晶闸管;抑制措施
HVDC;commutation failure;thyristor;suppression measures

Abstract:

Keywords:

基金项目(Foundation): 内蒙古自治区高等学校科学研究项目“消除换相失败的电流源型换流器原理与关键技术研究”（NJZZ22366）;; 内蒙古工业大学科学研究项目“抑制LCC换相失败的电流源型换流器原理与关键技术研究”（ZZ202122）

作者(Author): 贺日星,杨宝峰,陈瀚栋,罗振鹏
HE Rixing,YANG Baofeng,CHEN Handong,LUO Zhenpeng

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