Photovoltaic Multi-String Boosted Converter for Grid Applications

Abstract

As the demand for electrical energy is increasing, renewable energy sources has come into popularity especially photovoltaic systems (PV).This seminar report presents an overview of the power converters that are adopted in Photovoltaic generation sys- tems. This paper deeply analyses both converter configurations also taking into con- sideration the control aspects connected to the grid of such systems. In the proposed model photovoltaic cells are connected in a multi-string manner, then it is boosted up and connected to common dc bus, in the next stage boosted dc voltage is converted to ac by inverter. Nowadays micro-controllers are used to control how many PV cells are to be operated, according to the conditions. Soft switching methods are adopted in order to shape the rising and falling edges of switches switch current and volt- age. String conversion configuration based on several DC/DC converters connected to high voltage DC bus and linked to a single DC/AC converter appear as more complex solution but offer higher efficiency. MATLAB software is used to simulate the model. Almost completely, the requisites that make effective any reduction of energy consumption is based on power electronics.