Direct model reference adaptive internal model controller for better voltage sag ride through in doubly fed induction generator wind farms

This paper presents the function of a direct model reference adaptive internal model controller (DMR-AIMC) with variable gain adjustment mechanism for a doubly fed induction generator (DFIG) in a wind farm. Rotor current is controlled using the above controller with variable gain adjustment mechanism achieved using fuzzy sets and ANFIS to improve the voltage sag ride. Performance of the variable gain and linearly variable gain adjustment mechanisms are compared and their improvements are explored. Simulation results are used to demonstrate the effectiveness and robustness of the proposed control strategy, during variations in the variable gain adjustment mechanism. (C) 2012 Elsevier Ltd. All rights reserved.