Abstract
Photovoltaic (PV) power is most commonly used for water pumping applications. The DC output voltage of PV arrays is connected to a DC-DC converter using a maximum power point tracking (MPPT) controller to maximize their produced energy. Then, that converter is linked to a voltage source inverter (VSI) that converts DC power to AC power. Vector control is used to control the VSI fed three phase induction motor driving the water pump. The Affinity laws are used to change the pump characteristics by changing the pump speed, and consequently, the pump flow rate, head, and power will be varied. In this paper, the Affinity laws are adapted to achieve the pump hydraulic requirements while the power delivered to the pump motor remains unchanged by constructing new pump curves. A Matlab/Simulink model of the PV pumping system is observed over a wide range of weather and loading conditions.
Highlights
Photovoltaic energy represents an eco-friendly source of power
In order to obtain an efficient system, the PV modules must operate at the maximum power point (MPP) which allows the modules to produce all the power they are capable of based on the variation in the irradiation and temperature
The designed system consists of a PV array, a boost converter which its duty cycle is changed by using a maximum power point tracking (MPPT) algorithm (Perturb & Observe) so that the maximum power from the solar array is extracted, an inverter which is controlled using Indirect Field Oriented Control (IFOC), a three phase induction motor and a centrifugal pump model
Summary
Photovoltaic energy represents an eco-friendly source of power. It offers an excellent solution for providing sustainable and clean energy to remote and rural areas. Other than being economically competitive, solar water pumping systems are more reliable and require less maintenance. Several papers have investigated the use of the Affinity laws for energy saving purposes, as the pump power required decreases when the flow rate decreases [6] [11] [12] [13]. The proposed method differs from the others where the Affinity laws are investigated when the power delivered to the pump is constant. This paper is organized into sections as follows: In the first section, a basic introduction is given which includes a review of the existing research on the PV water pumping systems and its components, and shows where the proposed method is different. Section five concludes the paper with merits of the proposed system
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