This paper deals with comparative analysis different modified PWM control methods of Z source inverter (ZSI), also known as impedance source inverter for adjustable speed drives. In order to obtain boosted output voltage, a shoot through state should be created followed by an active state. Therefore, small changes are made in the classical three phase sinusoidal Pulse Width Modulation (PWM) technique to provide various shoot through control strategies for the ZSI. Simple boost control with triangular carrier wave, simple boost control with sinusoidal carrier wave, maximum boost control, maximum boost control with third harmonic injection, constant boost control and constant boost control with third harmonic injection are available in the literature for applications. In this work, simulations of various shoot through control methods are performed for the same modulation index and design parameters of the ZSI. The output voltage and output current of the inverter for the same input and load conditions are analysed using MATLAB/SIMULINK. © 2006-2015 Asian Research Publishing Network (ARPN).