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Frontiers in Energy

Front. Energy    2015, Vol. 9 Issue (2) : 187-198     https://doi.org/10.1007/s11708-015-0359-5
RESEARCH ARTICLE |
Implementation of photovoltaic water pumping system with MPPT controls
Najet REBEI(),Ali HMIDET,Rabiaa GAMMOUDI,Othman HASNAOUI
Unit of Research (ERCO), National Institute of Applied Sciences of Tunisia, North Urban Center, University of Carthage, 1080 Tunis Cedex, Tunisia
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Abstract

To increase the output efficiency of a photovoltaic (PV) system, it is important to apply an efficient maximum power point tracking (MPPT) technique. This paper describes the analysis, the design and the experimental implementation of the tracking methods for a stand-alone PV system, using two approaches. The first one is the constant voltage (CV) MPPT method based on the optimum voltage, which was deduced experimentally, and considered as a reference value to extract the optimum power. The second one is the increment conductance (Inc-Cond) MPPT method based on the calculation of the power derivative extracted by the installation. The output controller can adjust the duty ratio to the optimum value. This optimum duty ratio is the input of a DC/DC boost converter which feeds a set of Moto-pump via a DC/AC inverter. This paper presents the details of the two approaches implemented, based on the system performance characteristics. Contributions are made in several aspects of the system, including converter design, system simulation, controller programming, and experimental setup. The MPPT control algorithms implemented extract the maximum power point (MPP), with satisfactory performance and without steady-state oscillation. MATLAB/Simulink and dSpace DS1104 are used to conduct studies and implement algorithms. The two proposed methods have been validated by implementing the performance of the PV pumping systems installed on the roof of the research laboratory in INSAT Tunisia. Experimental results verify the feasibility and the improved functionality of the system.

Keywords photovoltaic generator (PVG)      maximum power point tracking (MPPT)      boost DC/DC converter      DC/AC inverter      moto-pump     
Corresponding Authors: Najet REBEI   
Just Accepted Date: 08 April 2015   Issue Date: 29 May 2015
 Cite this article:   
Najet REBEI,Ali HMIDET,Rabiaa GAMMOUDI, et al. Implementation of photovoltaic water pumping system with MPPT controls[J]. Front. Energy, 2015, 9(2): 187-198.
 URL:  
http://journal.hep.com.cn/fie/EN/10.1007/s11708-015-0359-5
http://journal.hep.com.cn/fie/EN/Y2015/V9/I2/187
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Najet REBEI
Ali HMIDET
Rabiaa GAMMOUDI
Othman HASNAOUI
Fig.1  Block diagram of the photovoltaic water pumping system
Fig.2  Temperature and illumination sensors cells
Fig.3  I-V photovoltaic characteristic for different irradiation levels
Fig.4  I-V photovoltaic characteristic for different temperatures
Fig.5  P-V characteristic for different illuminations
Fig.6  P-V characteristic for different temperatures
Fig.7  Block diagram of boost chopper
Fig.8  Block diagram of constant voltage MPPT control
Fig.9  Circuit of MPPT controller
Fig.10  Constant voltage MPPT control results with negative error
Fig.11  Constant voltage MPPT control results with positive error
Fig.12  Behavior of INC MPPT algorithm in thee-level operation
Fig.13  Flowchart of Inc-Cond algorithm
Fig.14  Experimental system
Fig.15  Water pumping program installed on Dspace DS1104
Fig.16  Actual captured illumination and duty ratio evolution
Fig.17  PVG and load voltages
Fig.18  Evolution of MPP
Fig.19  Waveform of stator speed and average value Vs.
Fig.20  Flow rate and torque evolution
Fig.21  Photovoltaic current waveform
Fig.22  Direct and quadratic currents components
Fig.23  Illumination and duty ratio evolution
Fig.24  Inc-cond MPPT method structure
Fig.25  Waveform of reference and output voltage
Fig.26  Evolution of MPP with weather variation
Fig.27  Water flow rate and torque evolution
Fig.28  Vs and ωs evolution
Fig.29  Illumination and duty ratio evolution
Fig.30  Reference and output voltage waveform
Fig.31  Evolution of MPP
Fig.32  Flow rate and torque evolution
Fig.33  ωs and average stator voltage evolution
Fig.34  Illumination and duty ratio evolution
Fig.35  PVG and load voltage wave form
Fig.36  MPP evolution
Fig.37  Flow rate and torque evolution
A p Pump torque constant
E s Illumination
H Total pump head
I pv PVG current
I sc Photocurrent
I sr Reverse saturation current
J Total inertia
p Pole pairs
q Electron charge
Q Water flow rate
r s Series resistance of the PVG
r sh Shunt resistance of the PVG
T a Absolute temperature
T e Electromagnetic torque
T L Load torque
T j Junction temperature/K
V pv PVG voltage
v th Thermal voltage of the PVG
V s Stator voltage
? B Boltzmann constant
? I Non-ideality coefficient
Φ s d-q axis stator flux
ω s Synchronous angular speed
ω r Drive angular speed
Tab.1  Notations
Pc/W Iopt/A Vopt/V Voc/V Isc/A Number of cell Type of cell Efficiency/%
50 2.9 17.2 21 3.4 36 Polycrystallin 11.3
Tab.2  Appendix 1 PVG parameters
Rated power P n = 0.37 kW
Rated flow Q ( l / mn ) = 30 ( min ) - 80 ( max )
High 12.8 ( min ) - 20.1 ( max )
Tab.3  Appendix 2 Pump parameters
Rated power P n = 0.61 kW
Stator resistance R s = 17.68 ?
Rotor resistance R r = 19.1 ?
Stator inductance L s = 0.6877 H
Rotor inductance L r = 0.6811 H
Mutual inductance M = 0.65611 H
Moment of inertia J = 0.0001 kg ? m2
Rated torque T n = 1.9 N ? m
Rated voltage V n = 220 V
Rated current I n = 1.45 A
Number of poles p = 1
Tab.4  Appendix 3 Parameters of induction motor
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