摘要
柔性直流工程建设正在向直流电网和多端直流纵深发展,而故障清除措施一直是制约工程建设的难点,也是研究的热点。该文对现有故障清除方案进行分类,将其按照物理作用原理分为"降压/增阻"类方案,同时按照故障清除措施作用空间分为"源侧"和"网侧"方案。对于现有方案在分类学上的空缺,提出一种网侧降压的直流钳压器概念,通过直流侧电压钳位的方式将故障线路电压降为零,实现故障电流的柔性清除。在直流电网中仿真验证相关概念的可行性,并通过等效电路实验进行验证。
The development of VSC-HVDC grows into DC grid and Multi-terminal DC.However,projects still have challenge on DC side fault clearance.This paper classified existing fault clearance method as two ways:"decrease DC voltage or increase fault line resistance",which operates according to the Ohm law.While in DC grid,these two method work on different area to cut fault line from"source side"and"line side".This paper proposed the concept of DC voltage clamper for the absence in line side voltage decrease equipment,which can clear DC fault current softly by clamping DC fault line voltage to zero.A basic and single direction clamping topology of DC voltage clamper were proposed and verified in a DC grid module.At last,an equivalent testing circuit was built for new equipment validation.
作者
赵西贝
樊强
许建中
赵成勇
苑津莎
ZHAO Xibei;FAN Qiang;XU Jianzhong;ZHAO Chengyong;YUAN Jinsha(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2019年第22期6697-6705,共9页
Proceedings of the CSEE
