A Modulated Model-Free Predictive Current Control for Four-Switch Three-Phase Inverter-Fed SynRM Drive Systems

Abstract

This paper presents a modulated model-free predictive current control for four-switch three-phase inverter-fed synchronous reluctance motor drive systems to improve performance against existing methods. The study focuses on six switching modes modulated with variable duty ratios that are optimized and computed in real-time. The stator currents corresponding to the six modulated switching modes are predicted without relying on the motor’s mathematical model nor parameters thanks to its model-free nature. To enhance the performance of the controller, adaptive current detection technique and current difference modification are employed, yielding good adaptation to the duty ratio modulations. Implementation of the proposed method is realized via a TMS320F28379D microcontroller on a testbed to assess its effectiveness. Finally, comparisons between the proposed scheme and a non-adaptive predecessor under various experimental settings are made to demonstrate its salient performance.

Keywords

• Four-switch three-phase inverter
• modulated model-free predictive current control
• synchronous reluctance motor
• modulation