科研之友
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摘要
The modular multilevel converters (MMC) has been investigated for a long time and has attracted increasingly more attentions due to its special topology. In order to generate more voltage levels with less power semiconductors for the MMC, this paper presented a novel topology of modular multilevel converters. There are two innovations for the proposed topology. 1. The current limiting inductance in each bridge arm is replaced by a split wound coupled inductor; 2. The sub-modules of the MMC is redesigned to further improve the performance of the system. Compare to the traditional submodules, the number of power semiconductors used in the newly designed sub-modules is reduced by half. The theoretical analysis shows that the number of output voltage levels of the proposed topology is increased from five levels to thirteen levels, thus the slew rate of the voltage (dv/dt) is suppressed and the total harmonic distortion (THD) is reduced. The simulation is also conducted in the paper which verified the correctness of the theoretical analysis.
