tailieunhanh - Vibration Analysis and Control New Trends and Developments Part 11

Tham khảo tài liệu 'vibration analysis and control new trends and developments part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 240 Vibration Analysis and Control - New Trends and Developments Fig. 19. Comparison of perturbations in pitch angle for the LQG and DAC 5. Conclusions and further works The purpose of this thesis has been to reduce the loads on a WT for above rated wind speeds Region III by speed control when applying different controlling methods. This was first performed by pitch regulation with DAC. This regulation policy showed to have some regulation capacity but also resulted in some bias in the control signal. It was found when utilizing the DAC controller that although the wind disturbance was well mitigated the settling time was relatively long approx. 10 sec . It could have been interesting to extend the work also to include torque regulation in below rated wind speeds. This regulation policy would aim at mitigation of speed and torque variations due to wind disturbances in Region II. The LQG regulator showed to give good speed attenuation but since DAC and LQG is quite different approaches were a comparison between them not possible. It would have been of major interest to extend the work to also considering pitch actuator constraints to see how this would have affected the results especially the control input signal. 6. Acknowledgment This work has been partially funded by Norwegian Centre for Offshore Wind Energy NORCOWE under grant 193821 S60 from Research Council of Norway RCN . NORCOWE is a consortium with partners from industry and science hosted by Christian Michelsen Research. 7. References Archer C. L. Jacobson M. Z. 2005 . Evaluation of global wind power Journal of Geophysical Research Vol. 110 p. 17. Athans M. 1981 . The Linear Quadratic LQR problem Massachusets Institute of Technology . Balas M. Lee Y. Kendall L. . . Disturbance tracking control theory with application to horizontal axis wind turbines Proceeding of the 1998 ASME Wind Energy Symposium Reno Nevada 12-15 January pp. 95-99. Control Design Methodologies for Vibration Mitigation on Wind Turbine

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