Performance Analysis of ZSI Fed IM Drive and VSI Fed IM Drive with Variable Load Torque
Keywords:
PWM, Shoot- through state, Simple Boost Control, Voltage Source Inverter, Z-source inverter.Abstract
This paper presents comparative analysis of Z-Source inverter (ZSI) fed Induction Motor (IM) drives with mostly used Voltage Source Inverter (VSI) fed IM drives when variable load torque is applied. ZSI has both voltages buck and boost capabilities as they allow inverters to be operated in the shoot through state. It employs an exclusive Z-Source network (LC component) to dc-link the main inverter circuit to the power source. By controlling the shoot-through duty cycle, the Z-Source inverter system reduces the line harmonics, improves power factor, increases reliability and extends output voltage range. Simulation results of the conventional VSI fed IM drive are compared with the ZSI fed IM drive. Simulation results of ZSI fed IM drive when variable torque is applied, gives better performance characteristics as compared to VSI fed IM drives for speed, torque, stator & rotor current characteristics.
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