Enhanced Quadratic V/f-Based Induction Motor Control of Solar Water Pumping System

Neama Yussif, Omar H. Sabry, Ayman S. Abdel-Khalik, Shehab Ahmed and Abdelfatah M. Mohamed
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Neama Yussif: Department of Energy Resources Engineering, Egypt-Japan University of Science and Technology, Alexandria 21934, Egypt
Omar H. Sabry: Department of Electrical Engineering, Alexandria University, Alexandria 21934, Egypt
Ayman S. Abdel-Khalik: Department of Electrical Engineering, Alexandria University, Alexandria 21934, Egypt
Shehab Ahmed: CEMSE Division, King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
Abdelfatah M. Mohamed: Department of Mechatronics and Robotics Engineering, Egypt-Japan University of Science and Technology, Alexandria 21934, Egypt

Energies, 2020, vol. 14, issue 1, 1-20

Abstract: In rural and remote areas, solar photovoltaic energy (PV) water pumping systems (SPWPSs) are being favored over diesel-powered water pumping due to environmental and economic considerations. PV is a clean source of electric energy offering low operational and maintenance cost. However, the direct-coupled SPWPS requires inventive solutions to improve the system’s efficiency under solar power variations while producing the required amount of pumped water concurrently. This paper introduces a new quadratic V/f (Q V/f) control method to drive an induction motor powered directly from a solar PV source using a two-stage power converter without storage batteries. Conventional controllers usually employ linear V/f control, where the reference motor speed is derived from the PV input power and the dc-link voltage error using a simple proportional–integral (PI) controller. The proposed Q V/f-based system is compared with the conventional linear V/f control using a simulation case study under different operating conditions. The proposed controller expectedly enhances the system output power and efficiency, particularly under low levels of solar irradiance. Some alternative controllers rather than the simple PI controller are also investigated in an attempt to improve the system dynamics as well as the water flow output. An experimental prototype system is used to validate the proposed Q V/f under diverse operating conditions.

Keywords: solar PV water pumping systems; quadratic V/f; induction motor; sliding mode controller; fuzzy logic controller (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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