Problem-Solving Mismatching Losses of Photovoltaic (PV) System under Partially Shaded Conditions

摘要

One of the recent concerns in the photovoltaic (PV)udsystem practice is solving the mismatching losses due to theudpartially shaded conditions. Mismatching problems mean that theudI-V and P-V curves between the shaded and non-shaded parts ofudPV module are totally different. Under mismatching condition,udmultiple local peaks can be observed in the PV moduleudcharacteristics which pose difficulties for controllers to track theudmaximum point. To overcome such problems, current injectionudmethod is used to compensate the output current of the shadedudpart. The amount of injected current and to which part of thisudcurrent being injected are determined by utilizing the intelligentudnetwork by means of Artificial Neural Network (ANN). Theudproposed method is always end up with single local maximumudpoint that makes the optimum point can be easily identified usingudconventional controller.