用于高压直流输电的低电容三相串联模块化多电平变换器及其二次谐波电压注入与高电容电压纹波技术

To significantly reduce energy storage requirements, this article proposes a low-capacitance three-phase series-connected modular multilevel converter with second harmonic voltage injection and high capacitor voltage ripples (HR SC-MMC). The lower limit of the capacitor voltage is reduced by the second harmonic voltage injection. Based on this new limit, the SM capacitance can be redesigned, achie...