COMPARATIVE ANALYSIS OF IMPROVED HIGH PERFORMANCE DIRECT POWER CONTROL OF THREE PHASE PWM RECTIFIER

Hemlata S Pol

Abstract: Direct Power Control with switching table control produces irregular ripples and variable switching frequency. In the improved DPC of PWM rectifiers using fractional control period of the active voltage vector and the rest period for the null vector not only makes it line side inductance independent of the circuit and is very simple to implement due to the duty cycle concept. By simulation it is identified that the level of distortion as well as regulation of the DC link voltage with control of power factor improves the overall performance of the drive. The improved Direct Power Control (DPC) PWM methodology is comprehensively analyzed and studied for three phase rectifiers and compared with the classical DPC with PLL. The MATLAB simulations shows the effectiveness in obtaining unity power factor and constant dc link voltage control. The power ripples are considerably reduced and input sinusoidal grid currents are obtained.

Keywords: Direct power control, instantaneous active and reactive power, pulse width modulation, duty cycle, dc link control, unity power factor

DOI: https://doi.org/10.15623/ijret.2015.0403067