适用于架空线路的全桥模块化多电平换流器启动策略

Startup Strategy of Full-Bridge Modular Multilevel Converter for Overhead Lines

全桥模块化多电平换流器(full-bridge modular multilevel converter,FBMMC)具有清除直流故障电流能力,适用于架空线路以及多端柔性直流输电系统。分析了FBMMC与半桥模块化多电平换流器(half-bridge modular multilevel converter,HBM M C)在启动时的差异。针对与有源系统和无源系统相联的FBM M C,分别提出了相应的分段启动策略,详细分析了启动过程,重点研究了多端系统中无源网络的黑启动策略。文章提出的策略能够保证换流站安全可靠启动,同时对于多端系统能够保证非故障端的稳定可靠运行。通过搭建PSCAD/EMTDC仿真模型进行仿真分析,验证了启动策略的有效性。

Full-bridge modular multilevel converter（ FBMMC） has strong ability to block DC fault current. It is more suitable for overhead lines and multi-terminal voltage source converter based HVDC system. This paper introduces the differences of startuping behaviors between FBMMC and HBMMC（ half bridge modular multilevel converter）. A sectionalized startup strategy is proposed and analyzed for FBMMC connected to active and passive system respectively. The startup strategy of passive network for black start is mainly studied. The proposed strategy is able to ensure a safe and reliable startup of the converter stations. In addition,the non-fault end of the system could work stablely. The validity of the proposed strategy is proved by PSCAD / EMTDC simulations.