Abstract
A single stage water pumping system comprises of a photovoltaic (PV) array, a controlled voltage source inverter, and an induction motor coupled with a water pump. It is highly efficient, low cost and easily controllable for water pumping application. The system characteristics are a predominant requirement for improving the performance. In this paper, the system behavior with six step mode, sinusoidal pulse width modulation (PWM) and space vector PWM (SVPWM) technique are studied. The system responses for different modulation indices are also reported. The characteristics for linear, centrifugal and optimized centrifugal pump load are determined. The experimental validation has been performed by implementing SVPWM employed with perturb and observe peak power tracking algorithm using dsPIC 6010A on a laboratory prototype. Thus, the system behavior proves to be high efficient, low cost and with simple control. Also, the selection of SVPWM with optimized v/f slope improves the performance of the system.
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