Dual-loop continuous control set model predictive control for a three-phase unity power factor rectifier

Abstract

In this paper, a novel cascade model predictive control for a three-phase unity power factor rectifier is presented. Unlike the traditional control techniques for rectifiers, the proposed method uses a cascade dual-model predictive control for the inner and outer control loops. The three-phase currents of the rectifier are controlled with the inner control loop, while with the outer control loop the desired output voltage is achieved. In this proposal, the output power is used as a feedforward to enhance the transient dynamics of the output dc-voltage. Several advantages can be highlighted such as a fixed switching frequency and output-voltage variations are avoided when a sudden change in the load or a voltage sag appears. The overall control proposal has been fully integrated into a digital signal processor. Selected experimental results are introduced to validate the theoretical contributions of this paper.