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Abstract and Applied Analysis
Volume 2014 (2014), Article ID 139752, 11 pages
http://dx.doi.org/10.1155/2014/139752
Research Article

Adaptive Backstepping Control Based on Floating Offshore High Temperature Superconductor Generator for Wind Turbines

1School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
2School of Automation, Chongqing University, Chongqing 400044, China
3School of Energy Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China

Received 18 February 2014; Revised 2 March 2014; Accepted 2 March 2014; Published 27 March 2014

Academic Editor: Peng Shi

Copyright © 2014 Feng Yang 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

With the rapid development of offshore wind power, the doubly fed induction generator and permanent magnet synchronous generator cannot meet the increasing request of power capacity. Therefore, superconducting generator should be used instead of the traditional motor, which can improve generator efficiency, reduce the weight of wind turbines, and increase system reliability. This paper mainly focuses on nonlinear control in the offshore wind power system which is consisted of a wind turbine and a high temperature superconductor generator. The proposed control approach is based on the adaptive backstepping method. Its main purpose is to regulate the rotor speed and generator voltage, therefore, achieving the maximum power point tracking (MPPT), improving the efficiency of a wind turbine, and then enhancing the system’s stability and robustness under large disturbances. The control approach can ensure high precision of generator speed tracking, which is confirmed in both the theoretical analysis and numerical simulation.