SVD-based indirect space vector modulation with feedforward compensation for matrix converters

Owing to the absence of intermediate energy storage elements, the outputs of matrix converters are influenced easily by abnormal input voltages. To this end, this paper proposes a generalized indirect space vector modulation with feedforward compensation capacity based on the space vector representation of the switch-state transfer matrices. To simplify the calculation of the modulation duty-cycle matrix, both the singular value decomposition and the space vector modulation techniques are used to render clear physical meanings to the modulation process, and to synthesize the desired variables without complex computations. Using this approach, the duty cycles for switch combinations can be calculated online to decouple the low order harmonics in the input side from the outputs. Besides, the geometrical perspective provided by this method makes the optimization on the switching sequence convenient. The simulation results verify the validity of the proposed method in maintaining the outputs sinusoidal and balanced disregarding the abnormal input voltages.