Robust control strategies on the optimization of a wind turbine pumping system

Abstract

Wind Turbine water pumping system (WTWPS) has been an important area of research during these last years. The control of WTWPS has attracted researchers from different fields to improve the effectiveness of water pumping systems. In this paper, we focus on the study of a pumping system composed by a wind turbine, permanent magnet synchronous generator, an induction motor (IM), and a centrifugal pump. Our purpose is to keep the water pumping in optimum conditions and maximize the extracted wind power. In a first step, we analyze the operation of WTWPS at variable speed with pitch angle control to ensure the required power without mechanical failure. The principle source and the dynamic load were connected via a direct current bus. On the other hand, to achieve the feeding of the moto-pump with a good quality of electrical energy, an analytic equation is developed which adapts the set point rotation speed of induction machine regardless the state of wind velocity. A nonlinear DTC control strategy is adopted based on space vector pulse width modulation. Simulation results are performed in MATLAB environment and show the performance and capability of the proposed control scheme of WTWPS.