Integrated Green Energy Solutions, Volume 2

29A Non-Isolated Step-Up Quasi Z-Source Converter Using Coupled Inductor

Shashank, P.C.¹ and Kanimozhi, G.^2*

¹ School of Electrical Engineering, Vellore Institute of Technology, Chennai, India

² Centre for Smart Grid Technologies, School of Electrical Engineering, Vellore Institute of Technology, Chennai, India

Abstract

A non-isolated high step-up quasi z-source dc-dc converter is examined and simulated in continuous conduction mode (CCM). The converter operation is based on continuous charging and discharging of the switched capacitors, coupled inductor, and switched inductor. The suggested converter has several advantages, including high and constant efficiency, high gain at lower duty cycles, and a larger range of operations based on the duty cycle. The main parameters like voltage gain, efficacy, voltage stress across power devices, minimum output voltage ripple are calculated. All the aforesaid parameters are analyzed through simulation. A comparison is also made between the suggested converter and a conventional converter on which an analysis was performed and the shortcomings have been rectified. A 400W high step-up quasi-z source dc-dc converter was designed and simulated in MATLAB/Simulink. For a 40V dc input and 50% duty cycle; a voltage gain of 9.5 and efficiency of 94% is achieved.

Keywords: Z-source converter, renewable energy, high gain, CCM, renewable energy sources

29.1 Introduction

Renewable energy sources like photovoltaic and fuel cells are manufactured ...