ABSTRACT:
This paper proposes a bidirectional power flow
control of a grid interactive solar photovoltaic (PV) fed water pumping system.
A brushless DC (BLDC) motor-drive without phase current sensors, is used to run
a water pump. This system enables a consumer to operate the water pump at its
full capacity for 24-hours regardless of the climatic condition and to feed a
single phase utility grid when the water pumping is not required. The full
utilization of a PV array and motor-pump is made possible in addition to an
enhanced reliability of the pumping system. A single phase voltage source
converter (VSC) with a unit vector template (UVT) generation technique
accomplishes a bidirectional power flow control between the grid and the DC bus
of voltage source inverter (VSI), which feeds a BLDC motor. The VSI is operated
at fundamental frequency, which minimizes the switching loss. The maximum power
point (MPP) operation of a PV array, and power quality improvements such as
power factor correction and reduction of total harmonic distortion (THD) of
grid are achieved in this system. Its applicability and reliability are demonstrated
by various simulated results using MATLAB/Simulink platform and hardware
implementation.
KEYWORDS:
1. Power flow control
2. Solar photovoltaic
3. Brushless DC motor
4. Voltage source converter
5. Unit vector template
6. Voltage source inverter
7. Maximum power point
8. Power quality
9. Power factor
10. Total harmonic distortion
SOFTWARE:
MATLAB/SIMULINK
CONCLUSION:
A
single phase grid interactive PV array based water pumping system using a BLDC
motor drive has been proposed and demonstrated. A bi-directional power flow
control of VSC has enabled a full utilization of resources and water pumping
with maximum capacity regardless of the climatic conditions. A simple UVT
generation technique has been applied to control the power flow as desired. All
the power quality aspects have been met as per the IEEE-519 standard. The speed
control of BLDC motor-pump has been achieved without any current sensing
elements. A fundamental frequency switching of VSI has contributed to enhance
the efficiency of overall system by reducing the switching losses. The proposed
solution has emerged as a reliable water pumping system, and as a source of
earning by sale of electricity to the utility when water pumping is not
required.
REFERENCES:
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[3] Billel Talbi, Fateh Krim, Toufik Rekioua, Saad Mekhilef, Abdelbaset Laib and Abdesslam Belaout, “A high-performance control scheme for photovoltaic pumping system under sudden irradiance and load changes,” Solar Energy, vol. 159, pp. 353-368, 2018.
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[5] R. Kumar and B. Singh, “BLDC Motor Driven Solar PV Array Fed Water Pumping System Employing Zeta Converter,” IEEE Trans. Ind. Appl., vol. 52, no. 3, pp. 2315-2322, May-June 2016.
