New Direct Power Control based on Fuzzy Logic for Three-Phase PWM Rectifier

This work proposes a new control strategy of a sinusoidal current absorption AC/DC converter as an alternative to harmonic pollution problems. It is based on the instantaneous direct active and reactive power control of PWM rectifiers known as direct power control (DPC). Although DPC has been considered a powerful and robust control system for PWM rectifiers, high power ripples and variable switching frequency are the two most notable drawbacks of conventional DPC. To overcome these drawbacks, we propose a new strategy of the DPC based on the fuzzy technique. The proposed strategy must provide unity power factor operation with good DC bus voltage regulation and stability and low harmonic distortion of network currents. To confirm the effectiveness of the proposed DPC of two-level PWM rectifier, numerical simulations were carried out under the Matlab/Simulink environment. Better performances will be obtained in transient and permanent state for the appreciable adjustment of the active and reactive instantaneous powers and especially for the case of rates harmonic distortion of current.