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Startup Scheme and Modulation Strategy for a New Modular Multilevel Converter
Guanlong Jia,Min Chen,Song Tang,Yi Lu,Yong Yang 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
The modular multilevel converter (MMC) topology is widely employed in the HVDC grid and HVAC grid. To reduce the number of sub-modules (SMs), a new MMC (N-MMC) is considered. However, its special topology leads to a more complicated startup scheme and modulation strategy than that of traditional MMC. To deal with this issue, a novel startup scheme and a modified carrier phase-shifted SPWM (MCPS-SPWM) strategy for the N-MMC are proposed and analyzed. Simulation and experimental results from a N-MMC inverter are provided to verify the feasibility and availability of the proposed startup scheme and modulation strategy.