Investigation of control and applications of modular multilevel converter with sub-modular series IGBTs
Investigation of control and applications of modular multilevel converter with sub-modular series IGBTs
复制标题
DOI：
10.1109/apec.2018.8341213
复制
发表时间：
2018-03
期刊：
影响因子：
--
通讯作者：
Lu Yue;Xiu Yao
中科院分区：
文献类型：
--
作者：
Lu Yue;Xiu Yao
模块化多电平换流器(MMC)是一种极具吸引力的输电选择，已被广泛研究和应用于高压直流输电。然而，当每个臂上的子模块数量很大时，它仍然有局限性。为了避免这些局限性并发挥其优势，本文提出了一种在每个子模块(SM)中集成MMC和串联IGBT的方法。所提出的MMC能够在额定电压较低的设备上承受较高的电压。串联的IGBT是自平衡的。SIMULINK和实时仿真都表明，采用该方法，串联IGBT能够分担更高的MMC子模块电压，并能及时地从电压不平衡中恢复。与基于RCD吸收电路的平衡方法相比，所提出的串联IGBT平衡方法产生的损耗要小得多。
Modular Multilevel Converter (MMC) has been an attractive option for power transmission and has been studied and used for HVDC applications. However, it still has limitations when the number of Sub-Modules per arm is large. To avoid the limitations and exploit the advantages, a method is proposed in this paper which integrates an MMC with series-connected IGBTs in each Sub-Module (SM). The proposed MMC is able to withstand a higher voltage with devices of lower voltage ratings. The series-connected IGBTs are self-balancing. Simulink and real-time simulations both show that, with the proposed method, series IGBTs are able to share a much higher MMC sub-module voltage and recover from voltage imbalances in a timely manner. The proposed series IGBT balancing method causes considerably less loss compared to RCD snubber circuit-based balancing methods.