中国电机工程学报2016，Vol.36Issue(7)：1849-1858,10.DOI:10.13334/j.0258-8013.pcsee.2016.07.011
混合式MMC及其直流故障穿越策略优化
Optimal Design for Hybrid MMC and Its DC Fault Ride-through Strategy
摘要
Abstract
Modular multilevel converter (MMC) for bulk power overhead line transmission is a hot issue of flexible DC transmission study in China. Difficultly and costly to handle DC fault is the main challenge. This paper investigated a hybrid high voltage direct current (HVDC) system, in which the rectifier adopts line commutated converter (LCC) and the inverter adopts hybrid MMC composed of half bridge sub-module (HBSM) and full bridge sub-module (FBSM). On the premise of being capable of operating at low DC voltage with over modulation, clearing DC fault and successful voltage balancing of HBSMs, the required number of sub-modules and the more costly FBSMs were calculated. Moreover, an improved DC fault ride-through strategy was proposed which balanced the capacity voltage of FBSMs better and maintained the reactive power compensation during the DC fault period. Finally, the capability of DC fault ride-through, over modulation and the operation under low DC voltage with optimal sub-module count for the hybrid MMC were verified using PSCAD/EMTDC simulations.关键词
混合直流输电系统/电网换相换流器/混合式模块化多电平换流器/直流故障穿越Key words
hybrid HVDC system/line commutated converter/hybrid modular multilevel converter/DC fault ride-through分类
信息技术与安全科学引用本文复制引用
李少华,王秀丽,李泰,彭忠..混合式MMC及其直流故障穿越策略优化[J].中国电机工程学报,2016,36(7):1849-1858,10.基金项目
国家863高技术基金项目(2015AA050101)。 The National High Technology Research and Development of China 863 Program (2015AA050101) （2015AA050101）
