Constrained optimal direct power control of voltage-source PWM rectifiers

Abstract

The paper presents an online approach to the model-predictive control of the boost type PWM rectifier. The optimization is made on a horizon of one switching period for a cost function based on the instantaneous real and imaginary power errors. The control vectors are synthesized by space-vector modulation and are confined to the hexagonal area defined by the possible switching states of the three-phase bridge. The optimal control algorithm is developed in presence of the grid current limitation, introduced as a practical constraint.