Design of DC-DC converter for a grid connected inverter

Abstract

Currently the use of energy from photovoltaic panels is a reality, and its extensive use will become extremely important in the research for solutions to energy and environmental problems. In this context, MPPT techniques are the most important part to extract the maximum power available. In this study, a DC-DC conversion system according to the boost topology has been designed. System tests were carried out outdoor at different solar radiation. First, the characteristic curve of the photovoltaic panel has been plotted, afterward the MPPT tracking system was connected. The controller communicates tracking data (current, voltage, duty cycle and power) at each step of the algorithm. Sometimes the algorithm deviates from the real maximum power point at first, making a false decision, but comes close thereafter. It is necessary to perform further investigations on this problem. An improvement of the used method is intended to take into account of all the constraints, so it would be possible to provide a simple and reliable system that tracks the maximum power point with minimum circuit and thus minimum consumption of energy.