3SSC Inverter Applied to a Photovoltaic System

Abstract

The use of renewable sources has attracted large interest in the area of electricity due to environmental issues that have affected the Earth. Brazil has great potential for solar electricity generation, which has been used by some public and private institutions. In this context, the inclusion of photovoltaic energy as an alternative source in the Brazilian mix has gained considerable prominence in recent years. The main purpose of this work is to present studies that aim at providing high power for an isolated load, through the application of a photovoltaic (PV) system connected to an inverter based on the three-state switching cell (typical acronym: 3SSC). This case shows itself as an interesting alternative because of the advantage of reducing the current levels of semiconductor devices by using a mixed multi-port PS-PWM, phase shift and delta-sine modulation control technique. The proposed system will be implemented in the PSIM software and the results and specifications will be discussed throughout next sections. Furthermore, there is a brief evaluation concerning ongrid operation, also considering the implementation of a cascaded boost converter (with Maximum Power Point Tracking - MPPT) to the above mentioned 3SSC inverter.