一种适合船舶中压直流电力系统的MMC并联结构

摘要

鉴于模块化多电平变换器(modular multilevel converter,MMC)桥臂额定电流难以满足船舶中压直流(medium voltage direct current,MVDC)电力系统逐渐增大的功率传输需求,设计一种适用于船舶MVDC大功率电力系统的MMC并联结构.应用MATLAB/Simulink,分别在MMC并联结构和MMC基本结构下,建立MMC-MVDC电力系统仿真模型.仿真结果表明,在传输同样大的功率时,采用MMC并联结构的桥臂电流明显比采用MMC基本结构的桥臂电流小,能克服MMC子模块中IGBT元件额定电流较小的障碍.%In view of the fact that the rated current of the bridge arm of the modular multilevel converter (MMC) can not meet the increasing demand for power transmission in the ship medium voltage direct current (MVDC) power system,a kind of MMC parallel structure suitable for ship MVDC high power system is designed.By MATLAB/Simulink,the simulation models of the MMC-MVDC power system are established for MMC parallel structure and MMC basic structure,respectively.The simulation results show that,when the same power is transmitted,the current of the bridge arm with MMC parallel structure is significantly lower than that of the bridge arm with MMC basic structure,which overcomes the obstacle of the lower rated current of the IGBT component in the MMC sub-module.