A Modulated Model Predictive Current Controller for Four-Switch Three-Phase Inverter-Fed SynRMs

Abstract

This paper proposes a modulated model predictive current controller (MMPCC) for four-switch three-phase inverter-fed synchronous reluctance motors (SynRMs). The modulation is introduced via a linear combination of predefined voltage vectors to boost the selections from four to eight. Each synthesized voltage vector contains two vectors with adjustable duty ratios. Both duty ratios and synthesized voltage vectors can be optimized via a new design of cost function. Current behaviors at varied command speeds in the steady-state condition are examined using the TMS320F28379D microcontroller. Compared to the existing method, the proposed MMPCC reduces both current ripple and current error by approximately 50%.