A general SVM algorithm for multilevel converters considering zero-sequence component control

Space vector modulation (SVM) scheme plays a significant role in high-voltage high-power applications of multilevel converters for its good performance. This paper presents a novel general SVM algorithm for multilevel converters. It includes two parts: one is control of fundamental component of three-phase outputs corresponding to reference vector; the other one is control of zero-sequence component of converter for additional goals. The algorithm in which a special coordinate transformation is introduced can easily identify the three vertices of small triangle that reference vector falls into, as well as corresponding duration time. And different objectives of multilevel converters can be accomplished with appropriate selection of zero-sequence components in each sampling period. This algorithm can be easily implemented without calculation of trigonometric function, and is applicable to different topologies with any number of levels. Simulation and experimental results are given to verify advantages of the algorithm.