Nonlinear ADRC Applied on Wind Turbine Based on DFIG Operating at its Partial Load

Abstract

This paper deals the modeling and synthesis of nonlinear control laws for the control of a wind turbine based on the DFIG (Fig. 1). In a first step, the objective is to build a model of a wind energy conversion system WECS, such as the combination of the aerodynamic and mechanical part integrating the turbine - the multiplier - the MPPT technique, and the electrical part DFIG associated with an active and reactive power control, based on a stator flux oriented control according to a dq-axis frame. After that, three laws of nonlinear control by ADRC Strategy (Active Disturbance Rejection Control) are applied to the MPPT method, and then to the converter RSC (Rotor Side Converter) both in hypo and in hyper synchronous mode of operation. Finally, the results obtained for each approach will be discussed and compared with the linear control technique. The system under study and the proposed controls are simulated using Matlab-Simulink.