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Backstepping with Integral Action Controller for a Solar Photovoltaic Powered Induction Motor

This current paper focuses on the solar photovoltaic (SPV) water pumping system based on an induction motor (IM) driving a kinetic-energy pump. To enhance the availability of solar radiation to lift desired quantity of water, a robust nonlinear sensorless maximum power point tracking (MPPT) is used to generate the appropriate duty cycle of the DC-DC converter. The rotor time-constant and the load torque disturbance estimators are suggested. It is necessary to develop these estimators, first, to reduce the sensitivity to variations due essentially to the temperature and second to avoid the use of the expensive sensor. To track the rotor speed and to maintain the rotor flux at its rated value, an indirect rotor field oriented control based on the approach of Backstepping with integral action is proposed. These two controllers are tested in MATLAB/SIMULINK and modeling and simulation results are presented to demonstrate the validity of the proposed approach under a variety of operating conditions of the induction motor and the atmospheric condition changes.