A Closed Loop Analysis of Z-Source Inverter Fed Induction Motor Drive with Variable Load Torque

This paper presents performance characteristics of Z-source inverter (ZSI) fed Induction Motor (IM) drives. ZSI has unique impedance network coupled between the power source and converter circuit to provide voltage buck and boost properties which cannot be achieved with conventional voltage source and current source inverters. To facilitate understanding of speed control for ZSI fed IM drives v/f control with simple boost PWM technique used. Simulation results of ZSI fed IM drives are compared with traditionally using VSI fed IM drives gives better performance for variable load torque, speed, rotor current characteristics.