Mitigating output DC current ripple in a three-phase current source rectifier using an optimized space vector modulation

Abstract

The mitigation of output DC ripple in three-phase current source rectifiers represents a significant design challenge, directly impacting the quality of the delivered power. To address this issue, this paper introduces a novel control framework based on the concept of Virtual Space Vector (VSV) modulation. The fundamental operating principle of the proposed strategy is to systematically reduce the dwell time of the active vector with the largest magnitude within each control sector. This principle is realized through a two-fold process. First, a set of virtual vectors is constructed, with each being a linear combination of two adjacent active switching vectors. Second, within every switching period, the desired current reference vector is synthesized not by the original active vectors, but by a combination of two neighboring virtual vectors and a zero vector. Comprehensive simulation results corroborate the effectiveness of this approach in attenuating DC-link current ripple.