Active tower damping for an innovative wind turbine with a hydrostatic transmission

In this paper, a decentralised control approach for an innovative 5 MW wind turbine with a hydrostatic transmission is presented that covers the whole range from low to very high wind speeds. An active damping of tower oscillations is achieved by using the pitch angle as control input. An elastic multibody system is employed to derive a control-oriented model for the first tower bending mode, which serves for the design of a stabilising control law. The active oscillation damping is combined with a multi-variable gain-scheduled PI state feedback control that allows for tracking desired trajectories for the angular velocities of both rotor and generator. The overall control performance is illustrated by realistic simulation results, which show an improved damping of tower oscillations and excellent tracking behaviour for the controlled variables.

[1]  Eere Doe,et al.  Advanced Wind Turbine Drivetrain Concepts: Workshop Report, June 29-30, 2010 , 2010 .

[2]  Dumitru Popescu,et al.  LQG Control of Horizontal Wind Turbines for Blades and Tower Loads Alleviation , 2011 .

[3]  Horst Schulte,et al.  Control-oriented modelling of wind turbines using a Takagi-Sugeno model structure , 2012, 2012 IEEE International Conference on Fuzzy Systems.

[4]  N.F.B. Diepeveen,et al.  Dynamic modeling of fluid power transmissions for wind turbines , 2011 .

[5]  Harald Aschemann,et al.  Control of a wind turbine with a hydrostatic transmission — An extended linearisation approach , 2012, 2012 17th International Conference on Methods & Models in Automation & Robotics (MMAR).

[6]  Harald Aschemann,et al.  Nonlinear control for load reduction on a variable speed pitch regulated wind turbine , 2013, 2013 18th International Conference on Methods & Models in Automation & Robotics (MMAR).

[7]  Amit Dixit,et al.  On the dynamics of the pitch control loop in horizontal-axis large wind turbines , 2005, Proceedings of the 2005, American Control Conference, 2005..

[8]  Harald Aschemann,et al.  Observer-based decentralised control of a wind turbine with a hydrostatic transmission , 2015, 2015 20th International Conference on Methods and Models in Automation and Robotics (MMAR).

[9]  Karl Stol,et al.  Individual Blade Pitch Control for the Controls Advanced Research Turbine "CART… , 2006 .

[10]  Vaughn Nelson.  Wind Energy: Renewable Energy and the Environment , 2009 .

[11]  Ping Hsu,et al.  Optimal aerodynamic energy capture strategies for hydrostatic transmission wind turbine , 2014, 2014 IEEE Conference on Technologies for Sustainability (SusTech).

[12]  John Lygeros,et al.  Nonlinear control of wind turbines: An approach based on switched linear systems and feedback linearization , 2011, IEEE Conference on Decision and Control and European Control Conference.

[13]  Horst Schulte,et al.  Control-oriented description of large scale wind turbines with hydrostatic transmission using Takagi-Sugeno models , 2014, 2014 IEEE Conference on Control Applications (CCA).