Linear Active Disturbance Rejection Control (LADRC) of a Variable Speed Wind Energy Conversion System using a DFI-Generator

Abstract

This paper aims at contributing to the modeling and control of a variable speed wind energy conversion system (WECS) based on a doubly fed induction generator (DFIG). The configuration based on a DFIG is the most commonly used in the high power wind farms. In this work, we present a model and a comparative study of two control strategies used with the DFIG; The first one is the classic Proportional and Integral (PI) controller and the second is the Active Disturbance Rejection Control (ADRC) controller. The Maximum Power Point Tracking (MPPT) technique is used to extract the maximum of the power available from the turbine by controlling the electromagnetic torque of the DFIG. Another controller is used to control the active and reactive power of the DFIG, using the PI regulators and a robust control based on the Linear Active Disturbance Rejection Control (LADRC). To compare the performances of the two controllers, a series of simulations were made in MATLAB/Simulink environment; a test of robustness was shown by changing the internal parameters of the generator.