A High Voltage Gain DC-DC Converter With Voltage Multiplier Module For Photovoltaic System

摘要

The massive usage of fossil fuels worsens the environment and also it could not satisfy the energy demand. Nowadays the world pays attention to renewable energy sources such as photovoltaic sources fuel cells and wind energy and so on. Among them photovoltaic sources are predicted to become biggest energy sources in future due to clean efficient and environmental friendly performance. But the output of renewable energy system is low thus high step up dc to dc converters are mandatory for high efficiency. Here a high step up converter is proposed for a photovoltaic system. High step up gain without operating at an extreme duty ratio is achieved by a voltage multiplier module an asymmetrical interleaved high step up converter. The voltage multiplier module is consisting of both a conventional boost converter and coupled inductors. The boost converter is integrated into the first phase to obtain a considerably higher voltage conversion ratio. The two phase structure not only reduces the current stress through each power switch but also constrains the input current ripple that decreases the conduction losses of metal-oxide-semiconductor field effect transistors. A simulation model is developed in MATLAB to judge the performance of dc to dc converter.