Abstract
This paper proposes a maximum power point tracking (MPPT) algorithm for the development of a three-phase induction motor angular speed drive. A Dc-to-Dc boost power converter, powered by photovoltaic (PV) panels, feeds the three-phase power inverter. The MPPT algorithm is based on the Exact Static Error Dynamics Passive Output Feedback Controller (ESEDPOF) technique together with an Algebraic Estimator of the impedance. The estimated value is the equivalent impedance that exists between the boost converter and the three-phase inverter, and then this value is used in real-time to generate the desired reference variables of the MPPT algorithm. The angular speed-tracking controller for the induction motor is based on the well-known Field-Oriented Control (FOC) technique. An Experimental set-up was developed using an array of two PV panels. Then, a realistic scenario is carried out, and real-time results at low-speed, with and without load, are presented in order to show the effectiveness and robustness of the proposed MPPT scheme. Under this scenario, the boost converter achieves an electric power efficiency of 80%, when a nominal load torque is applied to the induction motor shaft.
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