摘要
半全混合型模块化多电平换流器(hybrid modular multi-level converter,hybrid-MMC)能够利用全桥子模块清除直流故障,但其器件成本和运行损耗均较半桥型MMC增加一半以上,而半桥型MMC本身不具备故障清除能力。该文设计一种嵌套型MMC(converter embedded MMC,CE-MMC)方案,将子模块混合型MMC扩展到换流站混合型MMC,该拓扑结构使换流站整体具备负电平输出能力,故障后输出负电压清除故障。介绍CE-MMC拓扑的原理及故障穿越策略,分析方案中各支路器件参数的选取原则。仿真结果表明,CE-MMC方案在故障发生后4.2ms即可清除故障,相对多种典型方案具有经济性优势。
Hybrid modular multi-level converter(hybrid-MMC)can clear DC faults by using full-bridge sub-modules(FBSM),but its component cost and operating loss are more than half higher than those of half-bridge MMC.However,the half-bridge MMC can’t clear dc fault independently.In this paper,a converter embedded modular multi-level converter(CE-MMC)is investigated.CE-MMC extend the submodular hybrid MMC to converter hybrid MMC,which enables the converter to output negative voltage and clear dc faults.The operating principle and the fault ride-through strategy are introduced.The selection principle of the parameters of devices is analyzed.The simulation results show that the CE-MMC can clear DC faults in 4.2ms after the fault occurs.Moreover,CE-MMC has economic advantages compared with many typical schemes.
作者
朱雯清
赵西贝
赵成勇
ZHU Wenqing;ZHAO Xibei;ZHAO Chengyong(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power),Changping District,Beijing 102206,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2023年第21期8434-8443,共10页
Proceedings of the CSEE
基金
国家自然科学基金项目(52307097)。
