A novel fuzzy-based and voltage-oriented direct power control strategy for rectifier

Abstract

In order to regulate the instantaneous active and reactive powers of the rectifier in an optimized approach, a novel fuzzy-based and voltage-oriented direct power control strategy (FVO-DPC) is proposed in this study. The proposed strategy is based on the principle of the direct power control (DPC) strategy in three-phase voltage source pulse width modulations (PWM) rectifier. In the proposed FVO-DPC system, the active and reactive powers are controlled by a fuzzy logic controller and a fuzzy-based switching table. The fuzzy logic controller is run through introducing the errors between command and estimate values of the instantaneous active and reactive power. The switching loss, the control precision and the dynamic characteristics are taken into consideration simultaneously in the process of setting the switching states of the fuzzy-based switching table. The simulation model established under matlab/simulink environment is validated by comparing with the classical control scheme. The comparisons show that a near unit power factor and better transient and steady performance can be achieved with the proposed FVO-DPC.