Comparative Analysis on MMC Capacitor Voltage Balancing Strategy Based on Sorting Algorithm

doi:10.3969/j.issn.1000－7229.2017.11.002

Abstract

Abstract: ABSTRACT： Capacitor voltage balancing control strategy based on sort algorithm for modular multilevel converter (MMC) is widely used in practical engineering because of its good response to voltage balance. However, the real-time sorting requires excessive computation and high-frequency switching actions will result in larger switching losses. Therefore, while maintaining the module voltage balance, more research should be contributed to the time complexity and switching frequency of the balancing strategy. Based on the research of voltage balancing strategy of conventional sort algorithm, the existing improved strategies are divided into 3 categories according to different optimization mechanisms. The 3 kinds of strategies are compared and analyzed through different evaluation indexes. Finally, this paper discusses the future research direction and development trend of MMC voltage balancing strategy, which can provide reference and guidance for solving the capacitor voltage imbalance of MMC.

Key words: KEYWORDS： , modular multilevel converter(MMC), voltage balancing strategy, sort algorithm, time complexity, switching frequency

CLC Number:

TM 46

WANG Kun, LIU Kaipei, WANG Siru, LI Wei, WANG Yu, RAN Xiaohong. Comparative Analysis on MMC Capacitor Voltage Balancing Strategy Based on Sorting Algorithm [J]. Electric Power Construction, 2017, 38(11): 9-.

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