Enhanced Oversampling Deadbeat Control with PWM Ripple Compensation

Abstract

This paper presents a novel method for compensating PWM ripple currents without delay, enhancing the responsiveness of oversampling current control. Deadbeat control is known for its high responsiveness in PMSM control but lacks robustness against modeling errors, such as variations in resistance and inductance. Previous research has demonstrated that employing current oversampling can mitigate this issue. However, this method introduces voltage distortion due to discrepancies between real and reference voltages. While prior studies have proposed direct compensation methods, these often rely on approximations for current. This paper addresses the voltage distortion caused by PWM ripple currents. The proposed method eliminates PWM ripple from the detected current and the compensated signal is fed back to the controller to reduce voltage distortion. The effectiveness of this approach is validated through both simulation and experimental verification. Consequently, the proposed method enhances the responsiveness of current control without relying on any approximations.