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The Scientific World Journal
Volume 2015, Article ID 638120, 15 pages
http://dx.doi.org/10.1155/2015/638120
Research Article

LPV Control for the Full Region Operation of a Wind Turbine Integrated with Synchronous Generator

Mechanical Engineering in Cullen College of Engineering, University of Houston, N207 Engineering Building 1, 4800 Calhoun Road, Houston, TX 77204-4006, USA

Received 25 June 2014; Revised 23 August 2014; Accepted 26 August 2014

Academic Editor: Hua Bai

Copyright © 2015 Guoyan Cao 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

Wind turbine conversion systems require feedback control to achieve reliable wind turbine operation and stable current supply. A robust linear parameter varying (LPV) controller is proposed to reduce the structural loads and improve the power extraction of a horizontal axis wind turbine operating in both the partial load and the full load regions. The LPV model is derived from the wind turbine state space models extracted by FAST (fatigue, aerodynamics, structural, and turbulence) code linearization at different operating points. In order to assure a smooth transition between the two regions, appropriate frequency-dependent varying scaling parametric weighting functions are designed in the LPV control structure. The solution of a set of linear matrix inequalities (LMIs) leads to the LPV controller. A synchronous generator model is connected with the closed LPV control loop for examining the electrical subsystem performance obtained by an inner speed control loop. Simulation results of a 1.5 MW horizontal axis wind turbine model on the FAST platform illustrates the benefit of the LPV control and demonstrates the advantages of this proposed LPV controller, when compared with a traditional gain scheduling PI control and prior LPV control configurations. Enhanced structural load mitigation, improved power extraction, and good current performance were obtained from the proposed LPV control.