Improved Z-Source Inverter with Switched- Inductor and Trans Z-Source Topology

摘要

Z-Source Inverters (ZSI) have been recently proposed as an alternative power conversion concept as they have both voltage buck and boost capabilities. ZSI is an unique X-shaped impedance network that couples the converter main circuit to the power source. Among various topologies of ZSI, the concepts of Switched- Inductor and Trans Z-Source topologies are integrated into the classical Z-Source impedance network and their performance characteristics are considered in this work. The resulting topologies have enhanced voltage boosting capability. Switched-Inductor ZSI increases voltage boost inversion ability significantly. Trans Z-Source impedance network also leads to an enhanced boost ability assisted by the transformer. In power electronics, Pulse Width Modulation (PWM) have been the subject of intensive research and it is widely employed to control the output voltage of static power converters. Here, Space Vector Pulse Width Modulation (SVPWM) is implemented, which is a controlling technique in modulation. SVPWM can optimize the output voltage waveform of the inverter. A comparative study of boosted input voltage of various inverter topologies and also different PWM techniques are observed. This work explores the application of PWM methods in the estimation of power electronic waveforms are simulated using MATLAB.