正负序解耦控制的柔性直流系统交流故障特征  

Characteristics of AC Faults in Flexible DC System under Decoupling Control of Positive and Negative Sequences

作　　者：刘树[1] 梅红明[1] 刘斌[1] 李树峰[1] 张效宇[1] 王皆庆[1] LIU Shu;MEI Hongming;LIU Bin;LI Shufeng;ZHANG Xiaoyu;WANG Jieqing(Beijing Sifang Automation Co.,Ltd,Beijing 100085,China)

机构地区：[1]北京四方继保自动化股份有限公司,北京100085

出　　处：《电力系统及其自动化学报》2020年第2期68-76,共9页Proceedings of the CSU-EPSA

基　　金：国家重点研发计划专项资助项目“特高压大容量柔性直流输电控制保护及实时仿真试验技术研究”(2016YFB0901004)。

摘　　要：柔性直流电网换流站交流侧故障分析是交流侧故障配置的重要基础。针对柔性直流电网交流侧故障分析,提出了正负序解耦控制策略下换流器的序网等效方法,并在此基础上给出了交流侧不对称故障的序网图,从而分析了柔性直流系统交流侧故障特征,讨论了交流故障对直流系统的影响。最后,在PSCAD/EMTDC仿真平台上搭建了柔性直流电网模型,并通过大量仿真验证了所提分析方法的可行性。The analysis of faults on the AC-side of a converter station in flexible DC grid is an important basis for the AC-side fault configuration.In this paper,a sequence-equivalent method for the converter under the decoupling control strategy of positive and negative sequences is proposed at first.On this basis,the sequence diagram of asymmetric AC faults is given,and the characteristics of AC faults in the flexible DC system are analyzed.In addition,the influences of asymmetric AC faults on the DC system are discussed.Finally,a model of flexible DC grid is built on the PSCAD/EMT?DC simulation platform,and the feasibility of the proposed analysis method is verified through a large number of simula?tions.

关 键 词：柔性直流电网 正负序解耦控制 序网等效法 不对称故障分析 交互影响 

分 类 号：TM77[电气工程—电力系统及自动化]