A Three-Phase Four-Switch PWM Voltage-Source Rectifier usingd-q control fed induction motor drive

Abstract

Controller design for six-switch pulse width modulated (PWM) voltage source rectifiers (VSRs) is often accomplished in the rotating d-q frame coordinates in order to achievea high-performance control. In contrast, the development of a d-qframe controller for a four-switch PWM VSR is rarely reported inthe literature. In this regard, this paper introduces a control designapproach in rotating d-qframe for the four-switch PWM VSRs. Forthis purpose, a mathematical model of the four-switch PWM VSRin rotating d-q frame is first derived. Its success is relied on performing a so-called “reduced Park Transformation” on switchingfunctions. The derived model shares much structural property withthat of a six-switch VSR. Then, two d-q frame current controllerdesigns, input–output feedback linearization (IOFL) and linearproportional-plus-integral (LPI) control, are performed based onthe derived model as application examples. Their effectiveness isverified via computer simulation and hardware experiment. Responses of an LPI a-b-c frame controller originated from the six switch VSR are also documented for comparative study. Test resultsevidence the superiority of the d-q frame controllers.