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

doi:10.1007/s11708-014-0334-6

Front. Energy

2014, Vol. 8

Issue (4) : 480-489 https://doi.org/10.1007/s11708-014-0334-6

RESEARCH ARTICLE

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

Ramesh K GOVINDARAJAN(

), Pankaj Raghav PARTHASARATHY, Saravana Ilango GANESAN

Department of Electrical and Electronics Engineering, National Institute of Technology, Tiruchirappalli 620015, India

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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.

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

Corresponding Author(s): Ramesh K GOVINDARAJAN

Issue Date: 09 January 2015

Cite this article:

Ramesh K GOVINDARAJAN,Pankaj Raghav PARTHASARATHY,Saravana Ilango GANESAN. A control scheme with performance prediction for a PV fed water pumping system[J]. Front. Energy, 2014, 8(4): 480-489.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-014-0334-6
https://academic.hep.com.cn/fie/EN/Y2014/V8/I4/480

Fig.1 System level block diagram

Fig.2 Equivalent circuit of a PV cell

Tab.1 Specifications of the Solar PV Module at STC

Fig.3 Equivalent circuit of a boost converter

Fig.4 Flowchart for Newton- Raphson method to predetermine performance parameters

Fig.5 Output P-V characteristics at 700 W/m² when the series string has 6 panels, 7 panels, and 8 panels

Fig.6 Irradiation variation on a clear summer day in Chennai, India

Fig.7 Output P-V characteristics at 1000 W/m² when the series string has six PV modules, seven PV modules, eight PV modules

Fig.8 Proposed control logic with MPPT and voltage control mode

Tab.2 Comparison of duty ratio for operating points A and B

Fig.9 Experimental setup of the system

Tab.3 Comparison of predetermined and experimental values

Fig.10 Experimental waveforms

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