CAJ | 학술논문

基于模块化多电平换流器(modular multilevel converter， MMC)的统一潮流控制器(unified power flow controller ， UPFC)有谐波特性好、易于模块化设计、体积紧凑和不需要器件直接串联等优点，适用于高压大容量的输电领域，可以提高线路输电容量，改善系统暂态稳定，优化潮流降低网络损耗，因此受到重视。基于MMC的统一潮流控制器的动态模型是理解其工作原理和设计控制器的基础，该文分层次地逐步建立MMC型的UPFC开关周期平均模型和简化开关周期平均模型。在RTDS上对MMC型UPFC进行内部动态特性仿真，对仿真结果进行详细分析，仿真和分析结果表明基于 MMC 的统一潮流控制器的串联侧和并联侧内部动态有很大的差异，该结论和所建立的动态模型相互印证。
기우모괴화다전평환류기(modular multilevel converter， MMC)적통일조류공제기(unified power flow controller ， UPFC)유해파특성호、역우모괴화설계、체적긴주화불수요기건직접천련등우점，괄용우고압대용량적수전영역，가이제고선로수전용량，개선계통잠태은정，우화조류강저망락손모，인차수도중시。기우MMC적통일조류공제기적동태모형시리해기공작원리화설계공제기적기출，해문분층차지축보건립MMC형적UPFC개관주기평균모형화간화개관주기평균모형。재RTDS상대MMC형UPFC진행내부동태특성방진，대방진결과진행상세분석，방진화분석결과표명기우 MMC 적통일조류공제기적천련측화병련측내부동태유흔대적차이，해결론화소건립적동태모형상호인증。
ABSTRACT:The unified power flow controller (UPFC) based on modular multilevel converter (MMC) has good harmonic characteristics, such as being easy to modular design, small footprint, no series connected power semiconductor devices. It has been widely studied in transmission to improve line transmission capacity and system transient stability, and to optimize power flow to reduce network losses. The dynamic modeling of UPFC based on MMC is the basic of revealing the working mechanism and designing the controller. Switching cycle average model and simple switching cycle average model were gradually established, and the simulation about internal characteristic of UPFC based on MMC was conducted on RTDS platform. Simulation and analysis results show that internal dynamics of the proposed controller has great difference in its series and parallel side, the conclusion and the established dynamic model are mutual corroboration.