A control scheme with performance prediction for a PV fed water pumping system

Ramesh K GOVINDARAJAN, Pankaj Raghav PARTHASARATHY, Saravana Ilango GANESAN

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Front. Energy ›› 2014, Vol. 8 ›› Issue (4) : 480-489. DOI: 10.1007/s11708-014-0334-6
RESEARCH ARTICLE

A control scheme with performance prediction for a PV fed water pumping system

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Abstract

This paper focuses on modeling and performance predetermination of a photovoltaic (PV) system with a boost converter fed permanent magnet direct current (PMDC) motor-centrifugal pump load, taking the converter losses into account. Sizing is done based on the maximum power generated by the PV array at the average irradiation. Hence optimum sizing of the PV array for the given irradiation at the geographical location of interest is obtained using the predetermined values. The analysis presented here involves systems employing maximum power point tracking (MPPT) as they are more efficient than directly coupled systems. However, the voltage and power of the motor might rise above rated values for irradiations greater than the average when employing MPPT, hence a control scheme has been proposed to protect the PMDC motor from being damaged during these conditions. This control scheme appropriately chooses the optimum operating point of the system, ensuring long-term sustained operation. The numerical simulation of the system is performed in Matlab/Simulink and is validated with experimental results obtained from a 180 V, 0.5 hp PMDC motor coupled to a centrifugal pump. The operation of the system with the proposed control scheme is verified by varying the irradiation levels and the relevant results are presented.

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Keywords

photovoltaic system / boost converter / maximum power point tracking (MPPT) / DC permanent-magnet motor / centrifugal pump

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Ramesh K GOVINDARAJAN, Pankaj Raghav PARTHASARATHY, Saravana Ilango GANESAN. A control scheme with performance prediction for a PV fed water pumping system. Front. Energy, 2014, 8(4): 480‒489 https://doi.org/10.1007/s11708-014-0334-6

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