Efficiency Enhancement in SynRMs Using MTPW Control and Seven-Level NPC Inverter

Abstract

Multilevel inverters have emerged as a key research focus in power electronics due to their increasing importance in renewable energy systems and rotating machinery applications. These devices produce output voltages that closely approximate sinusoidal waveforms, significantly improving signal quality. Among available topologies, the Neutral Point Clamped (NPC) inverter proves particularly suitable for such applications, especially when numerous voltage levels are required. Our study examines a Synchronous Reluctance Motor (SynRM) driven by a sevenlevel multilevel inverter employing Maximum Torque Per Weber (MTPW) control. This approach achieves outstanding dynamic performance by directly linking torque control to current control. The selection of control methodology depends fundamentally on how reference current values are determined. Through comprehensive MATLAB/Simulink simulations, we performed a comparative analysis of conventional inverter characteristics. The results conclusively demonstrate superior performance in response time, torque ripple reduction, and current waveform quality enhancement.