Abstract
The effects of total voltage level number (TVLN) on behaviors of the modular multilevel converter (MMC) are analyzed in this paper. First, it gives a brief introduction on the MMC system for how the converter generates multilevel staircase waveform. Second, the operation characteristics during the start process are analyzed. The capacitor voltage of a SM, the DC voltage, the exchanging power, and the DC loop current would be all influenced by different TVLNs. Third, the harmonic components in steady state are discussed to reveal the reason why the total harmonic distortion (THD) of the output voltage of MMC reduces when the TVLN increases. Simulation results show the validation of the conclusions drawn in this paper. Furthermore, when the TVLN is small, the THD in SUPWM method is lowest. However, when the TVLN increases, especially greater than 11, the THD in CPS-SPWM method is lowest.
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