Sliding Mode Control Strategy for Wind Turbine Power Maximization

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.

[1]  Weiping Li,et al.  Applied Nonlinear Control , 1991 .

[2]  Paul Puleston,et al.  Variable structure system control design method based on a differential geometric approach: application to a wind energy conversion subsystem , 2004 .

[3]  R.G. Harley,et al.  Wind Speed Estimation Based Sensorless Output Maximization Control for a Wind Turbine Driving a DFIG , 2008, IEEE Transactions on Power Electronics.

[4]  Vicente Leon-Martinez,et al.  Analysis of Wind Generator Operations under Unbalanced Voltage Dips in the Light of the Spanish Grid Code , 2011 .

[5]  Jon Clare,et al.  Doubly fed induction generator using back-to-back PWM converters and its application to variable-speed wind-energy generation , 1996 .

[6]  R. Gagnon,et al.  Modeling and Real-Time Simulation of a Doubly-Fed Induction Generator Driven by a Wind Turbine , 2002 .

[7]  Vladislav Akhmatov,et al.  Variable-Speed Wind Turbines with Doubly-Fed Induction Generators , 2002 .

[8]  Vadim I. Utkin,et al.  Sliding mode control design principles and applications to electric drives , 1993, IEEE Trans. Ind. Electron..

[9]  Siegfried Heier,et al.  Grid Integration of Wind Energy Conversion Systems , 1998 .

[10]  Frede Blaabjerg,et al.  Transient stability of DFIG wind turbines at an external short‐circuit fault , 2005 .

[11]  A. Mullane,et al.  Modeling of the wind turbine with a doubly fed induction generator for grid integration studies , 2006, IEEE Transactions on Energy Conversion.

[12]  B. Lewke,et al.  Electromagnetic Interference on Large Wind Turbines , 2009 .

[13]  S. Iniyan,et al.  A review of wind energy technologies , 2007 .

[14]  Y. D. Song,et al.  Variable speed control of wind turbines using nonlinear and adaptive algorithms , 2000 .

[15]  Kay Hameyer,et al.  Crowbar System in Doubly Fed Induction Wind Generators , 2010 .

[16]  S. Bacha,et al.  Energy-Reliability Optimization of Wind Energy Conversion Systems by Sliding Mode Control , 2008, IEEE Transactions on Energy Conversion.

[17]  Christina N. Papadimitriou,et al.  Transient Response Improvement of Microgrids Exploiting the Inertia of a Doubly-Fed Induction Generator (DFIG) , 2010 .

[18]  Fotis D. Kanellos,et al.  Impacts of Large Scale Wind Penetration on Energy Supply Industry , 2009 .

[19]  Paul Puleston,et al.  Sliding mode control of wind energy systems with DOIG-power efficiency and torsional dynamics optimization , 2000 .

[20]  R. W. De Doncker,et al.  Doubly fed induction generator systems for wind turbines , 2002 .

[21]  N. D. Hatziargyriou,et al.  Illustration of Modern Wind Turbine Ancillary Services , 2010 .

[22]  Qiang Wu,et al.  Integral Fuzzy Sliding Mode Control for Variable Speed Wind Power System , 2007, 2007 IEEE International Conference on Automation and Logistics.