An Intelligent PV Panel Structure to Extract the Maximum Power in Mismatch Irradiance

Abstract

a new intelligent photovoltaic (PV) panel structure to extract the maximum power in mismatch irradiance is proposed. In conventional structures, difference of irradiance between series panels can cause the deviation of maximum power point. In this condition tracking MPP becomes difficult and reduces efficiency. Improvements in power electronics and its effects in PV industrial technology, developed many new PV structure in recent years. This paper proposes a new intelligent structure with module integrated converter for increasing energy capture in the PV series string. The advantage of new structure is that the MPP region extends from single panel MPP to a much wider range, causing the panels to operate independent of each other in mismatch condition. To study and show advantage of intelligent structure, a real simple model is selected and verified. For operating in MPP region, P&O algorithm is selected. Despite conventional structures, voltage is not appropriately varied for P&O algorithm used in intelligent structure and system experiences instability. To solve this instability problem, resistance is proposed as variable.MATLAB/Simulink is used for simulation and demonstration of expression. The results of this work have shown that using intelligent structure improves the energy harvesting up to 14 percent, and resistance is the best variable in tracking speed and accuracy.