Abstract:
This paper presents the behaviours of three-phase induction motor driving centrifugal pump under various solar
irradiation levels, where the motor speed and torque depend on the source voltage and frequency, while the water-flow
rate depends on the motor speed, density, and static head according to affinity flow. Matlab/ Simulink model is proposed
for studying the behaviours of these machines with respect to water flow capacity, motor current, electromagnetic torque,
and motor efficiency. The proposed photovoltaic with maximum power point tracking model based on observation and
perturbation (O&P) maximum power tracking model is applied. The output voltage is regulated throughout Buck-Boost
converter with purpose maintaining the output voltage at predetermined values. Since Induction motors are widely used in
pump systems, the electromagnetic torque, water-flow rate are studied for various source frequencies. Comparison
analysis is conducted for both motors with respect to water flow-rate, heads elevation, and motor current. In addition to
that, the proposed system presents Photovoltaic-grid (PV-Grid) integrated model, where the power shortage required for
normally operation of the pump is drawn from the electrical grid.
