高压直流输电系统换相失败判断方法研究  

Research on judgment of commutation failure in HVDC transmission system

作　　者：曾淑云[1] 江全元[1] 赵敏[2] 徐希望[2] ZENG Shu-yun;JIANG Quan-yuan;ZHAO Min(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China;China Electric Power Research Institute,Beijing 100192,China)

机构地区：[1]浙江大学电气工程学院,浙江杭州310027 [2]中国电力科学研究院,北京100192

出　　处：《能源工程》2018年第6期1-6,共6页Energy Engineering

基　　金：国家自然科学基金资助项目(51677164);国家电力公司科技项目(SGZJ0000KJJS1600465)

摘　　要：详细分析了换流器在换相电压不对称情况下实际的触发过程及换相原理,并着重考虑了换流器交流侧三次谐波对实际触发角的影响以及交流侧三次谐波和直流侧二次谐波对换相角的影响,提出了考虑谐波的熄弧角计算方法,进而基于熄弧角判断是否发生换相失败。在PSCAD中搭建Cigre-Benchmark标准直流系统,在换流母线处设置不对称故障,通过提出方法判断是否发生换相失败,结果表明所提方法准确有效。Actual switching instants and commutation of converters under unbalanced conditions were analyzed.Considering the impact of the third harmonic at AC during swithing instants as well as the second harmonic at DC during commutation,a calculation method for extinguishing angle considering harmonic was established,which was used to distinguish the commutation failure of converters.Based on the CIGRE HVDC system established in PSCAD,the method was compaed with the simulation results from PSCAD.The result showed the effectiveness of the method for distinguishing the commutation failure.

关 键 词：不对称情况 熄弧角 谐波 换相失败 

分 类 号：TM721.1[电气工程—电力系统及自动化]