This paper proposes a solar photovoltaic (SPV) array
fed water pumping system utilizing a zeta converter as an intermediate DC-DC
converter in order to extract the maximum available power from the SPV array.
Controlling the zeta converter in an intelligent manner through the incremental
conductance maximum power point tracking (INC-MPPT) algorithm offers the soft
starting of the brushless DC (BLDC) motor employed to drive a centrifugal water
pump coupled to its shaft. Soft starting i.e. the reduced current starting
inhibits the harmful effect of the high starting current on the windings of the
BLDC motor. A fundamental frequency switching of the voltage source inverter
(VSI) is accomplished by the electronic commutation of the BLDC motor, thereby
avoiding the VSI losses occurred owing to the high frequency switching. A new design
approach for the low valued DC link capacitor of VSI is proposed. The proposed
water pumping system is designed and modeled such that the performance is not
affected even under the dynamic conditions. Suitability of the proposed system
under dynamic conditions is demonstrated by the simulation results using
MATLAB/Simulink software.
KEYWORDS:
1.
SPV array
2.
Zeta converter
3.
INC-MPPT
4.
BLDC motor
5.
Electronic commutation
SOFTWARE: MATLAB/SIMULINK
CIRCUIT DIAGRAM:
Fig.1
Configuration of proposed SPV array-Zeta converter fed BLDC motor drive for
water pumping system.
EXPECTED SIMULATION RESULTS:
Fig.2
Performances of the proposed SPV array based Zeta converter fed BLDC motor
drive for water pumping system (a) SPV array variables, (b) Zeta converter
variables, and (c) BLDC motor-pump variables.
CONCLUSION:
The
SPV array-zeta converter fed VSI-BLDC motor-pump for water pumping has been
proposed and its suitability has been demonstrated by simulated results using MATLAB/Simulink
and its sim-power-system toolbox. First, the proposed system has been designed
logically to fulfil the various desired objectives and then modelled and
simulated to examine the various performances under starting, dynamic and steady
state conditions. The performance evaluation has justified the combination of
zeta converter and BLDC motor drive for SPV array based water pumping. The
system under study availed the various desired functions such as MPP extraction
of the SPV array, soft starting of the BLDC motor, fundamental frequency
switching of the VSI resulting in a reduced switching losses, reduced stress on
IGBT switch and the components of zeta converter by operating it in continuous conduction
mode and stable operation. Moreover, the proposed system has operated
successfully even under the minimum solar irradiance.
REFERENCES:
[1]
M. Uno and A. Kukita, “Single-Switch Voltage Equalizer Using Multi- Stacked
Buck-Boost Converters for Partially-Shaded Photovoltaic Modules,” IEEE
Transactions on Power Electronics, no. 99, 2014.
[2]
R. Arulmurugan and N. Suthanthiravanitha, “Model and Design of A Fuzzy-Based
Hopfield NN Tracking Controller for Standalone PV Applications,” Electr.
Power Syst. Res. (2014). Available: http://dx.doi.org/10.1016/j.epsr.2014.05.007
[3]
S. Satapathy, K.M. Dash and B.C. Babu, “Variable Step Size MPPT Algorithm for
Photo Voltaic Array Using Zeta Converter – A Comparative Analysis,” Students
Conference on Engineering and Systems (SCES), pp.1-6, 12-14 April 2013.
[4]
A. Trejos, C.A. Ramos-Paja and S. Serna, “Compensation of DC-Link Voltage
Oscillations in Grid-Connected PV Systems Based on High Order DC/DC
Converters,” IEEE International Symposium on Alternative Energies and Energy
Quality (SIFAE), pp.1-6, 25-26 Oct. 2012.
[5]
G. K. Dubey, Fundamentals of Electrical Drives, 2nd ed. New Delhi, India:
Narosa Publishing House Pvt. Ltd., 2009.
