Quasi two-Level Modulation for the MMC-Based Isolated DC/DC Converter

Medium voltage(MV) to low voltage (LV) isolated DC/DC converters can be realized with the MMC on the MV- side due to its unique features such as modularity and scalability. In this application, quasi two-level (Q2L) waveform in the AC side of MMC guarantees controllable dv/dt and small capacitor size for MMC submodules (SMs). There are different techniques including nearest level modulation (NLM), phase shift modulation (PSM), and single carrier modulation (SCM), which can be used to generate a Q2L waveform. In this paper, the total MMC losses, capacitor voltage ripple, and implementation complexities are used to compare these modulation techniques. Simulation and experimental results indicate that the SCM outperforms NLM and PSM interms of lower losses and implementation complexity

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