A Capacitor Voltage Equalization Control Strategy for Low-frequency Energy Storage MMC Submodule
Aiming at the problem of large fluctuations in the voltage amplitude of traditional MMC submodules under low-frequency conditions,this paper proposes a new voltage equalization control strate-gy for energy storage MMC low-frequency submodules based on supercapacitors and bidirectional DC/DC converters,and uses a bidirectional DC/DC converter based on the overall energy sequencing algorithm of the submodules to control the supercapacitance energy storage system to maintain the stability of the ca-pacitor voltage of the submodules under the low-frequency conditions of MMC.In this paper,MATLAB/Simulink is used to simulate the voltage equalization control strategy of the new energy storage MMC low-frequency submodule,and the simulation results show that the proposed control strategy can effectively suppress the fluctuation of the capacitor voltage of the submodule under low-frequency working condi-tions.
modular multilevel converterlow frequency controlbidirectional DC/DC controlsubmod-ule capacitor voltage equalization
国家科技期刊平台
NSTL
万方数据
维普
