Robust pitch controller for output power levelling of variable-speed variable-pitch wind turbine generator systems

A robust pitch (RP) controller for variable-speed variable-pitch wind turbine generator systems (VSVP-WTGS) is presented. The controller can not only level the wind energy conversion but also be applicable in a wide wind speed region even subject to large parametric or non-parametric disturbances. VSVP-WTGS consists of multi-subsystems with different time scales. The dominant ‘slow’ dynamics are non-affine and high nonlinear. By considering ‘fast’ subsystems as perturbations to the ‘slow’ one, the dynamics of VSVP-WTGS can be represented by a nominal model and an error one. The RP controller is composed of a nominal inverse-system controller and a robust compensator. With the nominal inverse-system controller, the nominal closed-loop system can track its reference dynamics. With the robust compensator, turbine parameter uncertainties and non-parametric perturbations are tolerated. The performance of the RP controller is confirmed through theoretical analyses and computer simulations. Results show that RP controller can operate in a wider wind speed region robustly compared with a proportional-integral-derivative controller. Compared with other nonlinear controllers, the RP controller is simpler and can be more easily extended to other kinds of WTGS.

[1]  Poul Ejnar Sørensen,et al.  Centralised power control of wind farm with doubly fed induction generators , 2006 .

[2]  Eduard Muljadi,et al.  Pitch-controlled variable-speed wind turbine generation , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[3]  Fernando D. Bianchi,et al.  Gain scheduling control of variable-speed wind energy conversion systems using quasi-LPV models , 2005 .

[4]  Tomonobu Senjyu,et al.  Gain scheduling control of variable speed WTG under widely varying turbulence loading , 2007 .

[5]  C. Desoer,et al.  Linear System Theory , 1963 .

[6]  W. Leithead,et al.  Implementation of wind turbine controllers , 1997 .

[7]  Naruhito Kodama,et al.  Power Variation Control of a Wind Turbine Generator Using Probabilistic Optimal Control, Including Feed-Forward Control from Wind Speed , 2000 .

[8]  Ahmet Duran Şahin,et al.  Progress and recent trends in wind energy , 2004 .

[9]  Geng Yang,et al.  Inverse-System Control Approach for Variable-Speed Variable-Pitch Wind Generator , 2007, IECON 2007 - 33rd Annual Conference of the IEEE Industrial Electronics Society.

[10]  Mark J. Balas,et al.  Periodic Disturbance Accommodating Control for Blade Load Mitigation in Wind Turbines , 2003 .

[11]  William Leithead,et al.  Appropriate realization of gain-scheduled controllers with application to wind turbine regulation , 1996 .

[12]  R. Chedid,et al.  Intelligent control of a class of wind energy conversion systems , 1999 .

[13]  N. Horiuchi,et al.  Torque and power limitations of variable speed wind turbines using pitch control and generator power control , 2001, 2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262).

[14]  P. Sørensen,et al.  Wind models for simulation of power fluctuations from wind farms , 2002 .

[15]  Xingjia Yao,et al.  Adaptive Fuzzy Sliding-mode Control in Variable Speed Adjustable Pitch Wind Turbine , 2007, 2007 IEEE International Conference on Automation and Logistics.

[16]  Katsumi Yamashita,et al.  Sliding mode controller design via H/sup /spl infin// theory for windmill power systems , 1999, IEEE SMC'99 Conference Proceedings. 1999 IEEE International Conference on Systems, Man, and Cybernetics (Cat. No.99CH37028).

[17]  E. Muljadi,et al.  Making connections [wind generation facilities] , 2005, IEEE Power and Energy Magazine.

[18]  Mark J. Balas,et al.  Dynamics and control of horizontal axis wind turbines , 2003, Proceedings of the 2003 American Control Conference, 2003..

[19]  W. Leithead,et al.  Control of variable speed wind turbines: Dynamic models , 2000 .

[20]  Chun-Wen Li,et al.  Decoupling theory of general multivariable analytic non-linear systems , 1987 .

[21]  Wilsun Xu,et al.  Control design and dynamic performance analysis of a wind turbine-induction generator unit , 2000 .

[22]  Anuradha M. Annaswamy,et al.  Stable Adaptive Systems , 1989 .

[23]  Tomonobu Senjyu,et al.  Output power leveling of wind turbine Generator for all operating regions by pitch angle control , 2006 .

[24]  Torbjorn Thiringer,et al.  Modeling of Wind Turbines for Power System Studies , 2002, IEEE Power Engineering Review.