This paper deals with the solar photovoltaic (SPV)
array fed water- pumping system using a Luo converter as an intermediate DC-DC
converter and a permanent magnet brushless DC (BLDC) motor to drive a
centrifugal water pump. Among the different types of DC-DC converters, an
elementary Luo converter is selected in order to extract the maximum power available
from the SPV array and for safe starting of BLDC motor. The elementary Luo
converter with reduced components and single semiconductor switch has inherent
features of reducing the ripples in its output current and possessing a boundless
region for maximum power point tracking (MPPT). The electronically commutated
BLDC motor is used with a voltage source inverter (VSI) operated at fundamental
frequency switching thus avoiding the high frequency switching losses resulting
in a high efficiency of the system. The SPV array is designed such that the
power at rated DC voltage is supplied to the BLDC motor-pump under standard
test condition and maximum switch utilization of Luo converter is achieved
which results in efficiency improvement of the converter. Performances at
various operating conditions such as starting, dynamic and steady state
behavior are analyzed and suitability of the proposed system is demonstrated
using MATLAB/Simulink based simulation results.
KEYWORDS:
1.
SPV array
2.
Luo converter
3.
BLDC motor
4.
Centrifugal water pump
5.
MPPT
6.
Switch utilization
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
Fig. 1 Configuration of proposed SPV
array-Luo converter fed BLDC motor drive for water pumping system.
EXPECTED SIMULATION RESULTS:
Fig. 2 Performances of SPV array of the
proposed SPV array-Luo converter
fed BLDC motor drive for water pumping
system.
Fig. 3 Performances of Luo converter of
the proposed SPV array-Luo
converter fed BLDC motor drive for water
pumping system.
Fig. 4 Performances of BLDC motor-pump
of the proposed SPV array-Luo
converter fed BLDC motor drive for water
pumping system.
CONCLUSION:
A solar photovoltaic array fed Luo
converter based BLDC motor has been proposed to drive water-pumping system. The
proposed system has been designed, modeled and simulated using MATLAB along
with its Simulink and sim-power system toolboxes. Simulated results have
demonstrated the suitability of proposed water pumping system. SPV array has been
properly sized such that system performance is not influenced by the variation
in atmospheric conditions and the associated losses and maximum switch
utilization of Luo converter is achieved. Luo converter has been operated in CCM
in order to reduce the stress on power devices. Operating the VSI in 120°
conduction mode with fundamental frequency switching eliminates the losses
caused by high frequency switching operation. Stable operation of motor pump system
and safe starting of BLDC motor are other important features of the proposed
system.
REFERENCES:
[1] Fei Ding, Peng Li, Bibin Huang, Fei
Gao, Chengdi Ding and Chengshan Wang, “Modeling and simulation of
grid-connected hybrid photovoltaic/battery distributed generation system,” in China
Int. Conf. Electricity Distribution (CICED), 13-16 Sept. 2010, pp.1-10.
[2] Zhou Xuesong, Song Daichun, Ma
Youjie and Cheng Deshu, “The simulation and design for MPPT of PV System Based
on Incremental Conductance Method,” in WASE Int. Conf. Information Eng.
(ICIE), vol.2, 14-15 Aug. 2010, pp.314-317.
[3] B. Subudhi and R. Pradhan, “A
Comparative Study on Maximum Power Point Tracking Techniques for Photovoltaic
Power Systems,” IEEE Trans. Sustainable Energ., vol. 4, no. 1, pp.
89-98, Jan. 2013.
[4] M. A. Eltawil and Z. Zhao, “MPPT
techniques for photovoltaic applications,” Renewable and Sustainable Energy
Reviews, vol. 25, pp. 793-813, Sept. 2013.
