【摘要】 模块化多电平换流器(modular multilevel converter,MMC)为多电平换流器家族中的一员,其技术特点非常适用于电压源换流器型高压直流(voltage source converter high voltage direct current,VSC-HVDC)输电领域。为了分析MMC的最新研究进展,首先介绍了MMC的拓扑电路及其工作原理,分析了其技术特点和应用领域,比较了其相对于传统2电平和3电平VSC拓扑的优势所在。然后分别从MMC的数学模型、调制策略、子模块电容均压、预充电、内部环流、控制方面、换流阀试验以及其在VSC-HVDC系统中的工程应用等方面,回顾了MMC目前在国内外的最新研究进展和工程应用现状,并指出了MMC自身的缺点和今后亟待研究的关键问题。已有的研究表明,MMC在电力系统中有着广阔的应用前景,是未来高压直流输电技术的一个重要发展方向。更多还原

【Abstract】 The modular multilevel converter(MMC) is a member of multilevel converter family,and is suitable for being applied in multilevel converter topology for voltage source converter high voltage direct current(VSC-HVDC) transmission due to its many advantages.To review the recent advances in the area of MMC technology,which has half bridge terminology,we firstly introduced the topology circuit,operating principle,technical characteristics and application fields of MMC,then analyzed the advantages of MMC by comparing with two level and three level VSC converter,and described the latest research and engineering application status of MMC,especially the research of mathematical model,modulation strategy,capacitor voltage balancing,precharge,circulating current,control,valves test,and the application in VSC-HVDC.Finally,we put forward the disadvantages and key issues to be urgently solved of MMC for the future.It is shown that MMC has extensive application prospect and is one of an important development direction for power HVDC transmission in future.更多还原