Optimal switching sequence model predictive control for three‐phase Vienna rectifiers

Abstract

Vienna rectifier is a typical three‐level rectifier with complicated operating constraints. Also, the constraints pose a challenge for designing controllers with good dynamic performance. As predictive control is good at dealing with constraints, an optimal switching sequence model predictive control (OSS‐MPC) strategy for the three‐phase Vienna rectifier is proposed. A proportional–integral controller is designed to regulate the dc‐link voltage. Also, an improved OSS‐MPC method is utilised to control the input currents. Compared to the conventional finite control set model predictive control, it has the extra advantages of improved steady‐state performance, fixed switching frequency, and elimination of weight factors. Simulation and experimental results verify the correctness and effectiveness of the proposed control scheme.