Impact Analysis of FCS-MPC on Power Losses of IPMSM Drive fed by Cascaded H-Bridge Multilevel Inverter

Abstract

This work aims to investigate the finite-control-set model predictive control impact on power losses and efficiency of an interior permanent magnet synchronous motor fed by a cascaded H-bridge multilevel inverter. This analysis is carried out by adopting the discrete Fourier transform approach, allowing motor power losses segregation into fundamental and harmonic power losses. To quantify finite-control-set model predictive control benefits, the standard field-oriented control strategy is adopted as a comparison target, and an experimental comparative analysis between such strategies is carried out on an interior permanent magnet synchronous motor drive fed by a cascaded H-bridge multilevel inverter. Comparison is carried out over 20 working points defined in the speed-torque plane at a fixed apparent switching frequency of 1.4 kHz. Experimental results prove that the model predictive control increases the motor efficiency in almost every working point, and most of the motor power losses are generated by fundamental quantities, implying additional margins for an overall efficiency improvement due to their controllability.