SVPWM control strategy for a three phase five level dual inverter fed open-end winding induction motor.

A Space Vector Pulse Width Modulation (SVPWM) control strategy is proposed for a three phase five level dual inverter fed open-end winding induction motor. This system includes 2 three level Neutral Point Clamped (NPC) inverters, which is supplied by two isolated dc power supplies. The conventional SVPWM has more complexity in reference vector identification and switching time calculation. The reference vector for proposed five level SVPWM scheme is tracked using three level voltage vector and offset voltage, where 5-level hexagonal region is divided into seven 3-level hexagonal regions. The proposed SVPWM leads to reduce the complexity in switching time calculation, Total Harmonic Distortion (THD) reduction, Minimization of Common Mode Voltage (CMV) and low voltage stresses across the switching devices. Also this system estimate the phase current of the five level dual inverter fed open-end winding induction motor. The results obtained using simulation and hardware are compared and verified using Digital Signal Processor.