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The modular multilevel converter (MMC) is receiving wide acceptance in both high- and medium-voltage (MV) applications. However, due to the low (fundamental and second-order) frequency ripple powers in the submodule (SM) capacitors, large capacitance is required to smooth the SM voltage. The SM capacitors account for a large portion of volume and weight in the MMC system. Present methods (e.g., circulating...
The huge capacitor voltage fluctuation of modular multilevel converters (MMC) at low output frequency restricts their application in medium voltage (MV) drives. Based on a modified MMC, this paper proposes a new method to overcome the difficulty. An improved phase-shift carrier PWM (PSC-PWM) can generate the switching-frequency voltage in the coupled upper and lower subarms, and the added flying capacitor...
With the application of digital control, the problem of one-step-delay appears. It limits the achievable control bandwidth. Compared with one-step-delay, minimized delay can achieve superior performance. However, it leads to the low-frequency aliasing phenomenon because sampling is not happened in the middle of either the turn-on or the turn-off times of IGBT. To weaken the influence of aliasing and...
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