Improved Z Source Inverter Performance with Reduced Z-Source Voltage Stress and Current Mechanism Using Buck and Boost Approach

Abstract

This paper presents a novel topology of Z-source inverter which can control the velocity of induction motor. The objective of our proposed topology is to improve the performance of Z-source inverter (ZSI) by reducing the voltage stress throughout the capacitors present in the impedance network. Therefore the voltage range of the Z-source capacitors is reduced which also reduces the cost of the proposed Z-source network topology. The ZSI is combined with an additional feature called buck and boost. Thus, it is otherwise known as buck-boost inverter. The proposed topology can effectively reducethe capacitor voltage which increases the efficiencyof the Z-source circuit. When compared to conventional Z-source inverter, our proposed topology is low cost with smaller in size and weight. The operational principle, proposed protocol and parameters design are discussed in detail. Experimental results are given to analyze the performance of proposed Z-source topology.