Current-Controlled PWM Strategy with Carrier Wave for Limiting the Switching Frequency of Three-Phase Voltage-Source Inverter in Vector Control of Induction Machine

摘要

This paper presents an appropriate methodto limit the switching frequency for a currentcontrolledvoltage-source PWM inverter. The currentcontrolledPWM strategy with carrier wave is based onclassical hysteresis control. The fictional hysteresisband is given by the amplitude of the triangular carrierwave, which is added to the reference signal. The errorbetween the reference current signal with carrier waveand current feedback signal determines the PWMswitching instants. In order to eliminate the unwantedhigh switching frequencies, a mathematical expressionhas been proposed based on graphical analysis. Themethod validation is illustrated by means of simulationin programming and simulation environmentMATLAB Simulink?. Moreover a comparison betweenthe proposed current-controlled PWM strategy withcarrier wave and the open loop voltage-controlledPWM strategy with synchronized triangular carrierwaveis made from point of view of harmonicdistortions.