An improved efficiency permanent magnet Brushless dc motor pv pumping system

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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