A Direct Buck-Boost Converter Based on Flyback Topology for Photovoltaic Application without Using Centre Tapped Transformer

Abstract

Nowadays photovoltaic system is most commonly used in industrial and residential application for the purpose of electrification. The main reason for using the solar energy is the lack of non- renewable energy resources. Even if the utilization of solar energy is not cost effective, we are making the use of it due to its availability in nature.  There are so many researches going on in order to reduce the cost and efficiency. Among these a flyback inverter is an important solution. The flyback inverter when operated in discontinuous conduction mode (DCM) has a better efficiency and low cost. But unfortunately, the current is distorted to non-linear loads. Also the Transformer Utilization Factor (TUF) is less and the mismatch in winding will leads to the production of unsymmetrical output voltage waveform. In this paper, a flyback transformer without centre tapping is introduced in order to reduce the above mentioned drawbacks. The simulations are done for both open loop and closed loop system. The distortion in the output voltage and current is reduced.