Impact of Shading on the Output Power of Photovoltaic Array

摘要

The photovoltaic systems are to make it energy efficient. Partial shading reduces the energy yield of photovoltaic systems and introduces multiple peaks in the P-V characteristics. The maximum power point trackers work in conjunction with the boost converter and track the global peak in the P-V characteristics. The boost converter used for maximum power point trackers is generally designed to operate with high efficiency at the maximum power point voltage of the array by assuming a single peak power point on the P-V characteristics. However, the efficiency of the boost converter varies with the input voltage, and the maximum power point of the load when the converter efficiency is considered is different from the maximum power point of the photovoltaic array. Since the maximization of power in the load is ultimately desirable, this study focuses on the maximization of power to the load. The power transferred to load under different shading patterns is analyzed and the results of the study are demonstrated through simulation and experimental results. In this paper emerging technologies are discussed. The output of a photovoltaic panel is affected by the changing atmospheric conditions such as solar Insolation, temperature partial shading, dust, etc. These factors have also being incorporated in the various techniques discussed.