A Sliding Mode Optimization of a Photovoltaic Pumping System
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This paper presents a new method to track the maximum power point for a photovoltaic water pumping system. For the best use, the photovoltaic panel must operate at its maximum power point. The photovoltaic panel efficiency, for given conditions, is maximal when its voltage equals a certain value that is optimal voltage which depends on irradiation, temperature and panel state. The pumping system considered in this paper consists of a photovoltaic generator with a power electronic converter that allows maximum power point tracking. The whole is feeding a DC motor coupling with a centrifugal pump. In this study, we developed a new controlled strategy based on a new sliding surface approach. This method gives a good maximum power operation under different conditions such as changing irradiation and temperature. In the presence of these variations, the duty cycle of the converter, chosen as the controller law, is adjusted by the sliding mode technique to track the maximum power point. Simulation results at different operating conditions are given and discussed with MATLAB /SIMULINK. They show the best performance of the system when the proposed control law is applied
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