Simulation and Optimization of a Three-Level Inverter Driven Induction Motor System

In high-performance induction motor applications, multilevel inverters have demonstrated the capability to deliver cleaner voltage waveforms than conventional topologies.Nevertheless, their implementation can be hampered by issues such as circuit complexity, neutral-point voltage imbalance, and substantial switching losses.This work develops a unified optimization framework that merges an improved Space Vector Pulse Width Modulation (SVPWM) technique, a resonant soft-switching stage, and silicon carbide (SiC) power devices.Within this approach, capacitor voltage balance is actively regulated using a strategy derived from the d-q model of a neutral-point-clamped (NPC) three-level inverter coupled to an induction motor.Soft switching is enabled via an auxiliary resonant circuit to achieve Zero-Voltage Switching (ZVS), while SiC devices help to lower both switching and conduction losses.Simulation results reveal that the proposed scheme achieves a total harmonic distortion (THD) below 3.5%, a load-disturbance recovery time of 0.12 s, torque ripple under 5%, and a 28% decrease in switching losses, which improves efficiency from 93.2% to 96.1%.Voltage deviation across capacitors remains within ±4%, confirming the reliability and potential industrial relevance of this design.