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On Space-Time Resolution of Inflow Representations for Wind Turbine Loads Analysis
Energies 2012, 5(7), 2310-2330; doi:10.3390/en5072310

Sliding Mode Control Strategy for Wind Turbine Power Maximization

Automatic Control and System Engineering Department, Engineering School of Vitoria, University of the Basque Country, Nieves Cano 12, Vitoria 01006, Spain
Received: 15 March 2012 / Revised: 25 June 2012 / Accepted: 3 July 2012 / Published: 9 July 2012
(This article belongs to the Special Issue Wind Turbines)
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The efficiency of the wind power conversions systems can be greatly improved using an appropriate control algorithm. In this work, a sliding mode control for variable speed wind turbine that incorporates a doubly fed induction generator is described. The electrical system incorporates a wound rotor induction machine with back-to-back three phase power converter bridges between its rotor and the grid. In the presented design the so-called vector control theory is applied, in order to simplify the electrical equations. The proposed control scheme uses stator flux-oriented vector control for the rotor side converter bridge control and grid voltage vector control for the grid side converter bridge control. The stability analysis of the proposed sliding mode controller under disturbances and parameter uncertainties is provided using the Lyapunov stability theory. Finally simulated results show, on the one hand, that the proposed controller provides high-performance dynamic characteristics, and on the other hand, that this scheme is robust with respect to the uncertainties that usually appear in the real systems.
Keywords: wind power; variable structure control; nonlinear system; modeling and simulation wind power; variable structure control; nonlinear system; modeling and simulation
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Barambones, O. Sliding Mode Control Strategy for Wind Turbine Power Maximization. Energies 2012, 5, 2310-2330.

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