This paper presents the optimal operation of a photovoltaic pumping system. The operation of a permanent magnet brushless DC motor driving a centrifugal pump is investigated. The motor is controlled through a hysteresis current loop and an outer speed loop with a PI type controller. The proportional and integral gains are set to their optimal values. In order to optimise the overall system efficiency, a Maximum power point tracker is also used. Simulation is carried out by formulating the mathematical model for the photovoltaic source, MPPT, motor and pump load. System performances are investigated under different levels of solar insolation. The effectiveness of the proposed controller is also demonstrated.

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