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Mathematical Problems in Engineering
Volume 2014, Article ID 201938, 13 pages
http://dx.doi.org/10.1155/2014/201938
Research Article

Design of Nonlinear Robust Rotor Current Controller for DFIG Based on Terminal Sliding Mode Control and Extended State Observer

1School of Electrical Engineering, Northeast Dianli University, Jilin 132012, China
2School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China

Received 8 November 2013; Revised 18 January 2014; Accepted 19 January 2014; Published 3 March 2014

Academic Editor: Shuping He

Copyright © 2014 Guowei Cai et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

As to strong nonlinearity of doubly fed induction generators (DFIG) and uncertainty of its model, a novel rotor current controller with nonlinearity and robustness is proposed to enhance fault ride-though (FRT) capacities of grid-connected DFIG. Firstly, the model error, external disturbances, and the uncertain factors were estimated by constructing extended state observer (ESO) so as to achieve linearization model, which is compensated dynamically from nonlinear model. And then rotor current controller of DFIG is designed by using terminal sliding mode variable structure control theory (TSMC). The controller has superior dynamic performance and strong robustness. The simulation results show that the proposed control approach is effective.