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Frontiers in Energy

Front. Energy    2014, Vol. 8 Issue (4) : 480-489
A control scheme with performance prediction for a PV fed water pumping system
Department of Electrical and Electronics Engineering, National Institute of Technology, Tiruchirappalli 620015, India
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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 Authors: 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.
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Saravana Ilango GANESAN
Fig.1  System level block diagram
Fig.2  Equivalent circuit of a PV cell
Rated power/W Open circuit voltage/V Short circuit current/A MPP voltage/V MPP current/A
80 22 4.7 18 4.4
Tab.1  Specifications of the Solar PV Module at STC
Fig.3  Equivalent circuit of a boost converter

(a) When IGBT is ON; (b) when IGBT is OFF; (c) with PV as input and PMDC motor as load

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

(a) Average power less than rated power; (b) average power nearly equal to rated power; (c) average power greater than rated power

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

(a) Six PV modules; (b) seven PV modules; (c) eight PV modules

Fig.8  Proposed control logic with MPPT and voltage control mode
No. of panels Operating point A Operating point B
Duty ratio Converter efficiency/% Duty ratio Converter efficiency/%
6 0.5428 89.53 0.3402 91.81
7 0.5428 89.53 0.2097 92.52
8 0.5428 89.53 0.1038 92.97
Tab.2  Comparison of duty ratio for operating points A and B
Fig.9  Experimental setup of the system
Parameter Predetermined value Experimental value
Input power PIN /W 380.33 366.2
Output power PO/W 350.25 335.7
Output voltage UO/V 179.06 176.4
Efficiency/% 92.09 91.67
Speed/(r·min–1) 2819.8 2788
Discharge/(L·min–1) 55.03 51.4
Tab.3  Comparison of predetermined and experimental values
Fig.10  Experimental waveforms

(a) VPV, IPV, PIN curves for MPPT (CH1: 20 V/div, CH2: 0.5 A/div, Time: 5 s/div); (b) Vo curve for MPPT to voltage control mode (CH1: 1 V/div, Time: 2 s/div); (c) Vo curve for voltage control mode to MPPT (CH1: 1 V/div, Time: 2 s/div)

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