Study on Decoupling Direct Power Control of PWM Rectifier Using Space Vector Modulation

摘要

In this paper, a decoupling direct power control of three-phase pulse width modulated (PWM) rectifier with constant switching frequency is presented. This control method, called space vector modulated direct power control (DPC-SVM), uses SVM technique for the converter switching signal generation. Based on the power control model of the converter in synchronous dq coordinates, the control strategy allows to solve the coupling between instantaneous active and reactive power, used as the PWM control variables, and consequently, leads to simple design method of system controller. The proposed DPC-SVM system exhibits several advantages, particularly providing line current very close to sinusoidal waveforms (TDH < 2 %), and good regulation of DC-bus voltage is achieved using PI controller. The simulation calculation was carried out using MATLAB?-SIMULINK? package and results have proven the excellent performance and verify the validity and effectiveness of the control strategy with different loads.