Generalized Space Vector Modulation for Grid-Connected Current Source Converter in both Continuous and Discontinuous Current Modes

Abstract

Three-phase current source converter (CSC) is widely used in many applications. In practice, the CSC may operate in both continuous current mode (CCM) and discontinuous current mode (DCM) under different loadings. In case of DCM, the grid current of CSC would be distorted and the output voltage would lose control. In order to solve the problem, a novel generalized space vector modulation strategy is presented in this paper. Compared with the conventional solution, the proposal reduces the total harmonic distortion of grid current from 27.01% to 3.91% in the DCM. Meanwhile, the output voltage is well regulated to the rating, instead of losing control. The simulation results verify the effectiveness of the proposed solution.