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Single Stage PV Water Pumping System With MPPT Employing Three Phase Induction Motor

In recent years, solar photovoltaic systems have become more popular and today, this technology has become the application of interest mainly in isolated areas where the power grid is not accessible. Generally, PV fed dc motors are used because of their robust construction and ease to control. However, dc motors need to be frequently maintained due to its commutator and carbon brush. Hence in this paper, centrifugal pump driven by three-phase induction motor is considered. To power the three-phase induction motor, a three-phase voltage source inverter is used which performs two functions, viz., (i) converts the Maximum Power-Point dc voltage into three-phase ac voltage (ii) changes the frequency of the three-phase ac voltage and helps the system to guide at the Maximum Power Point.