Nonlinear robust control to maximize energy capture in a variable speed wind turbine

2008 ◽  
Author(s):  
E. Iyasere ◽  
M. Salah ◽  
D. Dawson ◽  
J. Wagner
Keyword(s):  
Robust Control ◽  
Wind Turbine ◽  
Variable Speed ◽  
Nonlinear Robust Control ◽  
Energy Capture ◽  
Variable Speed Wind Turbine ◽  
Nonlinear Robust

Methods for Increasing Region 2 Power Capture on a Variable-Speed Wind Turbine

2004 ◽  
Vol 126 (4) ◽  
pp. 1092-1100 ◽  
Author(s):  
Kathryn E. Johnson ◽  
Lee J. Fingersh ◽  
Mark J. Balas ◽  
Lucy Y. Pao
Keyword(s):  
Wind Turbine ◽  
Maximum Energy ◽  
Control Methods ◽  
Variable Speed ◽  
Rotor Speed ◽  
Energy Capture ◽  
Control Scheme ◽  
Variable Speed Wind Turbine ◽  
Power Capture ◽  
Speed Fluctuations

The standard region 2 control scheme for a variable-speed wind turbine, τc=Kω2, has several shortcomings that can result in significant power loss. The first of these is that there is no accurate way to determine the gain K; modeling programs are not accurate enough to represent all of the complex aerodynamics, and these aerodynamics change over time. Furthermore, it is not certain whether the value of K used in the standard control even provides for the maximum energy capture under real-world turbulent conditions. We introduce new control methods to address these issues. First, we show in simulation that using smaller values of K than the standard can result in increased energy capture. Second, we give simulation results showing that an optimally tracking rotor control scheme can improve upon the standard scheme by assisting the rotor speed in tracking wind-speed fluctuations more rapidly. Finally, we propose an adaptive control scheme that allows for maximum power capture despite parameter uncertainty.

Robust control design of variable speed wind turbine using quantitative feedback theory

2018 ◽  
Vol 232 (6) ◽  
pp. 691-705 ◽  
Author(s):  
Navdeep Singh ◽  
Bhanu Pratap ◽  
Akhilesh Swarup
Keyword(s):  
Robust Control ◽  
Wind Turbine ◽  
Control Design ◽  
Control Technique ◽  
Effective Control ◽  
Quantitative Feedback Theory ◽  
Variable Speed ◽  
Variable Speed Wind Turbine ◽  
Wide Range ◽  
Robust Control Design

A robust control design of a three blade, horizontal axis variable speed wind turbine is developed in this paper. The variable speed wind turbine model consists of higher order nonlinear dynamics where uncertainty has been considered in the plant parameters. Quantitative feedback theory is an effective and efficient, robust control technique through which the desired specifications over a specified range of parametric uncertainty can easily be achieved in the frequency domain. The proposed robust torque and pitch control in variable speed wind turbine using quantitative feedback theory satisfy prescribed gain and phase margin, degree of tracking for the robust performance, fast convergence, noise attenuation, and input and output disturbance rejection. The advantages of the proposed robust control design are the consideration of a wide range of performance specifications and achieving effective control over an increased operating frequency range. The simulation results demonstrate the satisfactory performance of proposed quantitative feedback theory-based controller and prefilter which fulfill the necessary conditions such as robust stability and robust tracking. Further, it has been shown that the performance of the quantitative feedback theory-based controller is better than the performance with a standard wind turbine controller and also from the performance by proportional-integral controller.

Robust CRONE Design for a Variable Ratio Planetary Gearing in a Variable Speed Wind Turbine

2011 ◽  
Author(s):  
Benjamin Feytout ◽  
Patrick Lanusse ◽  
Jocelyn Sabatier ◽  
Serge Gracia
Keyword(s):  
Robust Control ◽  
Wind Turbine ◽  
Synchronous Generator ◽  
Variable Ratio ◽  
Variable Speed ◽  
Direct Drive ◽  
Variable Speed Wind Turbine ◽  
Pi Controllers ◽  
Control Methodology ◽  
Full Conversion

Most wind turbines installed have traditional architectures: double-fed asynchronous machine or direct drive with full conversion, both containing several levels of control composed of PI controllers. In our application, a robust 3rd-generation-CRONE controller is used to manage a planetary gearing ratio upstream of a synchronous generator directly connected to the grid. Thus, the speed of the low shaft is controlled and unlike other architectures, no system of power electronics is required for conversion. This CRONE approach is a robust control methodology based on fractional order differentiation.

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