Abstract
The main application of off-grid solar photovoltaic (SPV) systems is water extraction in rural areas where access to the grid is restricted. In this application, photovoltaic (PV) and pump system regulation are crucial to increase its overall efficiency. In this context, this work presents a simple and efficient off-grid SPV water pumping system (SPVWPS). The designed system is based on a DC-DC boost converter, a three-phase DC-AC inverter, and a three-phase induction motor (IM) coupled to the centrifugal pump. The proposed solution is operated using a control strategy that associates an improved fractional open-circuit voltage (FOCV) method for maximum power point tracking (MPPT) and closed-loop scalar control. This association avoids the use of a speed sensor/encoder and a current sensor for the IM. Finally, the effectiveness of the proposed off-grid SPVWPS and its control system for both steady-state and dynamic conditions of insolation change is verified using a 1KVA rated prototype. The relevance of the drive is also checked in various operating conditions and is found to be adequate for pumping water. Moreover, the proposed method guarantees a fast response, less oscillations around the MPP, a system efficiency of 99%, and a high flow rate due to the extraction of maximum power.
Highlights
The generation based on fossil fuels from coal and oil threatens climatic conditions, accelerating carbon emissions [1]
The effectiveness of the fractional open-circuit voltage (FOCV) technique is based on the use of a voltage sensor (LEM LV-25) for the acquisition of the PV array voltage Vpv
The simplest form of operation is to maintain the PV generator at a constant voltage identical to the optimal voltage at standard test conditions (STC) furnished by the manufacturer
Summary
The generation based on fossil fuels from coal and oil threatens climatic conditions, accelerating carbon emissions [1]. The applications of energy using solar photovoltaic (SPV) generators can be varied because of their enormous benefits. The SPV isolated systems are low price, secure, International Journal of Photoenergy and straightforward solutions for decentralised energy supply. They allow secure and decentralised electrical sources to be installed in areas far away from power plants. In [7], the authors proposed a fuzzy precompensated hybrid proportional integral controller for permanent magnet motor driven solar water pumping system that overcomes conventional controller shortcomings. The gridconnected motor-driven solar-powered water pumping system with efficient control is proposed in [9], which provides MPP tracking along with bidirectional power flow between the grid and PV
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