Alleviating the Tower Mechanical Load of Multi-MW Wind Turbines with LQR Control

다국어 초록 (Multilingual Abstract)

This paper addresses linear quadratic regulation (LQR) for variable speed variable pitch wind turbines. Because of the inherent nonlinearity of wind turbines, a set of operating conditions is identified and then a LQR controller is designed for each of the operating points. The feedback controller gains are then interpolated linearly to get a control law for the entire operating region. In addition, the aerodynamic torque and effective wind speed are estimated online to get the gain-scheduling variable for implementing the controller. The potential of this method is verified through simulation with the help of MATLAB/Simulink and GH Bladed. The performance and mechanical load when using LQR are also compared with those obtained when using a PI controller.

목차 (Table of Contents)

• Abstract
• Ⅰ. INTRODUCTION
• Ⅱ. WIND TURBINE MODEL
• Ⅲ. CONTROLLER DESIGN
• Ⅳ. WIND SPEED ESTIMATION
• Ⅴ. NUMERICAL SIMULATION
• Ⅵ. CONCLUSIONS
• REFERENCES

참고문헌 (Reference)

1 E. L. van der Hooft, "Wind turbine control algorithms"

2 E. A. Bossanyi, "The design of closed loop controllers for wind turbines" 3 (3): 148-163, 2000

3 K. Z. Ostergaard, "Gain-scheduling linear quadratic control of wind turbines operating at high wind speed" 276-281, 2007

4 E. A. Bossanyi, "GH Bladed theory manual(version 3. 81)"

5 K. Stol, "Full-state feedback control of a variable-Speed wind turbine : A comparison of periodic and constant gains" 123 (123): 319-326, 2001

6 남윤수, "Feedforward Pitch Control Using Wind Speed Estimation" 전력전자학회 11 (11): 211-217, 2011

7 K. Z. Ostergaard, "Estimation of effective wind speed" 75 : 1-9, 2007

8 E. B. Muhando, "Augmented LQG controller for enhancement of online dynamic performance for WTG system" 33 (33): 1942-1952, 2008