MMC（模块化多电平变换器：Modular multilevel converter）子模块直流侧加入储能电池即构成储能型MMC换流器，无需额外的功率转换装置可对交、直流电网提供有功功率支撑。本文分析了储能型MMC换流器的复杂工况，针对性地提出了基于直流功率、交流功率的相间、桥臂间与模块间三级荷电状态（state of charge, SOC）均衡控制策略，并通过仿真和实验验证了所提策略的正确性。
英文摘要:
The DC side of the MMC (Modular multilevel converte) sub-module with the energy storage battery will form an energy storage type MMC converter, which does not require an additional power conversion device to provide active power support to the AC and DC power grids. In this paper, the complex operating conditions of energy storage MMC converters are analyzed, and the equalization control strategy of three-stage state of charge based on DC power and AC power is proposed, which is verified by simulation and experiment.