Hysteresis Band Current Control for a Single Phase Z-source Inverter with Symmetrical and Asymmetrical Z-network

A Z-source Inverter has been proposed as a new topology in recent years. In this inverter an impedance network is placed between an inverter and a power source which provides both voltage buck and boost capabilities. This paper presents a unipolar hysteresis band current control method for a single phase Z-source inverter with symmetrical and asymmetrical Z-network configuration. The obtainable output current of this method in magnitude is higher than the hysteresis current control used in a traditional inverter. This paper also analyses the performance of the proposed control method under input dc voltage fluctuation and load current transient. Theoretical analysis and MATLAB simulations have been performed to describe and validate the control method.