ABSTRACT:
This paper proposes a
simple, cost effective and efficient brushless DC (BLDC) motor drive for solar
photovoltaic (SPV) array fed water pumping system. A zeta converter is utilized
in order to extract the maximum available power from the SPV array. The
proposed control algorithm eliminates phase current sensors and adapts a
fundamental frequency switching of the voltage source inverter (VSI), thus
avoiding the power losses due to high frequency switching. No additional
control or circuitry is used for speed control of the BLDC motor. The speed is
controlled through a variable DC link voltage of VSI. An appropriate control of
zeta converter through the incremental conductance maximum power point tracking
(INC-MPPT) algorithm offers soft starting of the BLDC motor. The proposed water
pumping system is designed and modeled such that the performance is not
affected under dynamic conditions. The suitability of proposed system at
practical operating conditions is demonstrated through simulation results using
MATLAB/ Simulink followed by an experimental validation.
KEYWORDS:
1.
BLDC motor
2.
SPV array
3.
Water pump
4.
Zeta converter
5.
VSI
6. INC-MPPT
SOFTWARE:
MATLAB/SIMULINK
BLOCK DIAGRAM:
Fig.1
Configuration of proposed SPV array-Zeta converter fed BLDC motor drive for
water pumping system.
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:
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http://dx.doi.org/10.1016/j.epsr.2014.05.007
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