Improvement of Z-source inverter properties using advanced PWM methods

This paper describes improvement of Z-source inverter (ZSI) properties possible due to advanced PWM methods. Switching conditions and distribution of semiconductor power losses in the ZSI are analyzed. Two new PWM methods are proposed, including Asymmetric Optimized Switching Type (AOST) with efficiency improvement by 2,7%. Considerations are illustrated with datasheet based calculations, simulation results and test of the Z-source inverter 2,5 kVA laboratory model.