Abstract：Due to the various advantages compared with three-level converter, the five-level diode-clamped converter(5L-DCC) is widely studied. This paper focuses on the DC-capacitor voltage balancing and vector sequences switch mechanism of a space vector modulation(SVM) modulated 5L-DCC as modulation index is less 0.5. The 5L-DCC voltage balancing strategy based on objective function optimization is analyzed. On the basis of seven segment and five segment vector sequences, this paper comes to two vector sequences selection rules according to reference vector location. The DC-capacitor voltage balancing and narrow pulse problems are solved. The simulation and experimental results show that the proposed method is effective and capacitor voltage ripple is low.
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2014, Vol. 29 
