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Load Mitigation Control Design for a Wind Turbine Operating in the Path of Vortices. Presented at the Science of Making Torque from Wind 2004 Special Topic Conference Delft, The Netherlands, April 19-21, 2004.

DE200415009601

Publication Date	2004
Personal Author	Hand, M. M.; Balas, M. J.
Page Count	20
Abstract	Turbulence generated in the stable atmospheric boundary layer can contain vorticity that adversely affects wind turbine blade fatigue life. We investigated advanced control algorithms that mitigate the vortex/wind turbine interaction. State space control designs can meet multiple control objectives such as maintaining power regulation while mitigating blade flap bending moment amplitude. We implemented disturbance accommodating control (DAC) methods in a structural dynamics code to mitigate blade loads and maintain constant power production in above-rated wind speeds. As a best-case scenario, we implemented a disturbance model that incorporated very detailed vortex characteristics in full-state feedback. This reduced equivalent fatigue load as much as 30% compared to a standard proportional-integral (PI) controller. A realizable DAC controller that incorporates only the vertical shear component of the vortex reduced loads by 9% compared to a PI controller, and as much as 29% when the vortex was superimposed over normal turbulence.
Keywords	Wind turbines Algorithms Bending Boundary layers Design Disturbances Feedback Mitigation Power generation Regulations Shear Torque Turbines Turbulence Vortices Path of vortices Load mitigation control
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	National Renewable Energy Lab., Golden, CO.; Colorado Univ., Boulder.; Department of Energy, Washington, DC.
Supplemental Notes	Prepared in cooperation with Colorado Univ., Boulder. Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200514

Load Mitigation Control Design for a Wind Turbine Operating in the Path of Vortices. Presented at the Science of Making Torque from Wind 2004 Special Topic Conference Delft, The Netherlands, April 19-21, 2004.

Load Mitigation Control Design for a Wind Turbine Operating in the Path of Vortices. Presented at the Science of Making Torque from Wind 2004 Special Topic Conference Delft, The Netherlands, April 19-21, 2004.
DE200415009601

Publication Date	2004
Personal Author	Hand, M. M.; Balas, M. J.
Page Count	20
Abstract	Turbulence generated in the stable atmospheric boundary layer can contain vorticity that adversely affects wind turbine blade fatigue life. We investigated advanced control algorithms that mitigate the vortex/wind turbine interaction. State space control designs can meet multiple control objectives such as maintaining power regulation while mitigating blade flap bending moment amplitude. We implemented disturbance accommodating control (DAC) methods in a structural dynamics code to mitigate blade loads and maintain constant power production in above-rated wind speeds. As a best-case scenario, we implemented a disturbance model that incorporated very detailed vortex characteristics in full-state feedback. This reduced equivalent fatigue load as much as 30% compared to a standard proportional-integral (PI) controller. A realizable DAC controller that incorporates only the vertical shear component of the vortex reduced loads by 9% compared to a PI controller, and as much as 29% when the vortex was superimposed over normal turbulence.
Keywords	Wind turbines Algorithms Bending Boundary layers Design Disturbances Feedback Mitigation Power generation Regulations Shear Torque Turbines Turbulence Vortices Path of vortices Load mitigation control
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	National Renewable Energy Lab., Golden, CO.; Colorado Univ., Boulder.; Department of Energy, Washington, DC.
Supplemental Notes	Prepared in cooperation with Colorado Univ., Boulder. Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200514