Influence of Control on the Pitch Damping of a Floating Wind Turbine

Jonkman, Jason

doi:10.2514/6.2008-1306

Cited by 167 publications

(130 citation statements)

References 11 publications

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“…The task of damping tower oscillations was addressed by [6], suggesting an influence of tower acceleration on blade pitch control. A linear quadratic regulator (LQR) was applied to a floating wind turbine in [7,8], which showed improved results in power stability and tower oscillations compared to [5]. Other, similar studies have been published in [9,10], e.g., [9] also used LQR on a floating wind turbine and presented error and platform motion reduction at the same time.…”

Section: Introductionmentioning

confidence: 95%

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Damping Wind and Wave Loads on a Floating Wind Turbine

2013

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Offshore wind energy capitalizes on the higher and less turbulent wind speeds at sea. To enable deployment of wind turbines in deep-water locations, structures are being explored, where wind turbines are placed on a floating platform. This combined structure presents a new control problem, due to the partly unconstrained movement of the platform and ocean wave excitation. If this additional complexity is not dealt with properly, this may lead to a significant increase in the structural loads and, potentially, instability of the controlled system. In this paper, the wave excitation is investigated, and we show the influence that both wind speed, wave frequencies and misalignment between wind and waves have on the system dynamics. A new control model is derived that extends standard turbine models to include the hydrodynamics, additional platform degrees of freedom, the platform mooring system and tower side-side motion, including gyroscopic effects. The models support a model-based design that includes estimators for wind speed and wave frequency. The design is applied to a number of examples representing different wind and wave conditions and successfully demonstrates a reduction in the structural oscillations, while improving power performance.

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Section: Introductionmentioning

confidence: 95%

“…In [5], a gain scheduled proportional integrating (GSPI) controller showed good performance regarding tower oscillations, but overshoots rated power and generator speed, which may reduce the generator lifetime. The task of damping tower oscillations was addressed by [6], suggesting an influence of tower acceleration on blade pitch control.…”

Section: Introductionmentioning

confidence: 99%

Damping Wind and Wave Loads on a Floating Wind Turbine

2013

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“…Despite this approach was proved suitable for applying the gross wind turbine loads, further process for incorporating the effect of turbine control on the global dynamic response of the FOWT is impossible. As shown in the works of [15] and [23], the wind turbine control is closely related to the integral dynamic responses of a given FOWT system. Over the last several years, the University of Maine has collaborated with the Maritime Research Institute Netherland (MARIN) basin in conducting a sequence of Froude-scaled model tests for spar-type, semi-submersible-type, and TLP-type floating wind turbines [18][19][20] that were 1:50 geometrically scaled from the National Renewable Energy Laboratory (NREL) 5 MW reference wind turbine [2].…”

Section: Introductionmentioning

confidence: 99%

Experimental comparisons of dynamic properties of floating wind turbine systems based on two different rotor concepts

Duan

Liu

et al. 2016

Applied Ocean Research

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a b s t r a c tThis article presents research findings on the response characteristic differences between the thrustmatched blade system (TMBS) and the geometry-matched blade system (GMBS), which utilize redesigned thrust-matched and original geometry-matched blades, respectively, both based on the OC3 spar-type floating offshore wind turbine (FOWT). Particulars of this research are to examine the unique dynamic response characteristics of the TMBS, which includes a better performance-matched rotor relative to the GMBS. The response behaviors of the TMBS and GMBS are compared and studied based on a sequence of wind and irregular wave scenarios to reveal the unique roles that the thrust-matched rotor plays in the dynamic response behaviors of the floating wind turbine system. Gyroscopic effects of rotor rotation are found weakened in the TMBS, and yaw oscillation in the TMBS is not solely excited by rotor rotation, unlike in the GMBS. Coupling effects between surge and pitch are found in both the TMBS and GMBS under combined wind-and-wave condition. Furthermore, restraining effects of wind loads on motions in the GMBS and TMBS are both evident at natural frequencies while show distinct behaviors at the wave frequency. It is observed from the experimental measurements that the tower-top bending moment of the TMBS shows similar oscillation characteristics as that of the GMBS but with larger oscillation amplitudes. Furthermore, it is found that tower-top shear force and axial rotor thrust of the TMBS show distinct exciting motivators and much larger oscillation amplitudes relative to those of the GMBS. For both the TMBS and GMBS, the tensions measured in mooring lines are found to be coupled by yaw motion for windonly cases while being clearly influenced by surge and heave couplings under integrated wind-and-wave load condition.

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“…These introduce an inverse-response behavior due to the interaction of the fore-aft motion with the control, which results in a "negative damping" of the FOWT system. This has been described in [22] for conventional single-input-singleoutput (SISO) control and recently in [23] for an improved behavior using more control inputs than the rotor speed error. Another example of advanced controllers for FOWTs using wind preview information is [24].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Floating Offshore Wind Turbine Platforms With a Self-Tuning Controller

Lemmer

Müller

et al. 2017

Volume 10: Ocean Renewable Energy

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The dynamic response of floating offshore wind turbines is complex and requires numerous design iterations in order to converge at a cost-efficient hull shape with reduced responses to wind and waves. In this article, a framework is presented, which allows the optimization of design parameters with respect to user-defined criteria such as load reduction and material costs. The optimization uses a simplified nonlinear model of the floating wind turbine and a self-tuning model-based controller. The results are shown for a concrete three-column semi-submersible and a 10 MW wind turbine, for which a reduction of the fluctuating wind and wave loads is possible through the optimization. However, this happens at increased material costs for the platform due to voluminous heave plates or increased column spacing.

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Influence of Control on the Pitch Damping of a Floating Wind Turbine

Cited by 167 publications

References 11 publications

Damping Wind and Wave Loads on a Floating Wind Turbine

Damping Wind and Wave Loads on a Floating Wind Turbine

Experimental comparisons of dynamic properties of floating wind turbine systems based on two different rotor concepts

Optimization of Floating Offshore Wind Turbine Platforms With a Self-Tuning Controller

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