Vibration control of spar‐type floating offshore wind turbine towers using a tuned mass‐damper‐inerter

Sarkar, Saptarshi; Fitzgerald, Breiffni

doi:10.1002/stc.2471

Cited by 116 publications

(44 citation statements)

References 42 publications

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“…A non-linear aeroelastic model of the FOWT [21] has been used in this study to simulate its dynamic behaviour subjected to a stochastic wind-wave loading environment and evaluate the performance of the controller. The full non-linear FOWT model has 22 degrees of freedom as listed in Appendix A. Aerodynamic and hydrodynamic loads on the wind turbine are estimated using the Blade Element Momentum (BEM) theory and Morison's equation respectively.…”

Section: Proposed Control Strategymentioning

confidence: 99%

Individual Blade Pitch Control of Floating Offshore Wind Turbines for Load Mitigation and Power Regulation

Sarkar

Fitzgerald

Basu

2021

IEEE Trans. Contr. Syst. Technol.

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This paper proposes a new strategy for individual blade pitch control to regulate power production while simultaneously alleviating structural loads on spar-type floating offshore wind turbines. Individual blade pitch control types of algorithms for offshore wind turbines are sparse in the literature though there are expected benefits from experience on such types of controllers for onshore wind turbines. Wind turbine blade pitch actuators are primarily used to maintain rated power production at above-rated wind speeds and therefore, control algorithms are usually developed only to regulate power production. The scope of reducing structural loads using individual pitch control has been proved to be very promising over the last decade and numerous individual pitch control algorithms have been proposed by researchers. However, reduction in structural loads often results in a degradation in power production and regulation. Furthermore, improving power regulation often has a detrimental effect on the floating platform motion. In this paper, a new control strategy is proposed to achieve the two competing objectives. The proposed controller combines a low authority Linear Quadratic (LQ) controller with an integral action to reduce the 1P (once per revolution) aerodynamic loads while regulating power production using the same pitch actuators that are traditionally used only to optimize power production. The proposed controller is compared against the baseline controller used by state-of-the-art wind turbine simulator FAST using a high fidelity aeroelastic offshore wind turbine model. Numerical results show that the proposed controller offers improved performance in optimizing power production and reducing wind turbine and platform loads compared to the baseline controller over an envelope of windwave loading environment.Index Terms-Floating offshore wind turbines, individual blade pitch control, regulate power production, alleviate aerodynamic loads.

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Section: Proposed Control Strategymentioning

confidence: 99%

Individual Blade Pitch Control of Floating Offshore Wind Turbines for Load Mitigation and Power Regulation

Sarkar

Fitzgerald

Basu

2021

IEEE Trans. Contr. Syst. Technol.

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“…Our ability to control natural or technological systems is the ultimate proof of our understanding of them 1 . Thanks to scholars' tireless exploration of mechanical vibration through the ages, artificial intervention or control of vibration systems has become increasingly accessible 2,3 . By active vibration control strategies generally exerting adjustable external forces on machines, it is possible to give them self‐recovery ability to contain unfavorable vibrations 4 .…”

Section: Introductionmentioning

confidence: 99%

Active fast vibration control of rotating machinery via a novel electromagnetic actuator

Shao

Wang

et al. 2021

Struct Control Health Monit

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Summary This paper presents an active fast vibration control (AFVC) strategy applicable to rotating machinery. The actuator utilized is a novel active magnetic bearing that could achieve the integration with a hole‐pattern seal. The control algorithm leading to an electromagnetic force with an optimal combination of phase and magnitude under a certain speed is based on the principle of feedforward compensation and self‐optimization. The AFVC algorithm is implemented in a real compressor rotor system model and experimentally demonstrated on two test rigs of different scales. There is at least a 70% reduction in vibrations within 1 s over the case with no control. Excellent vibration control effects can be maintained even when the rotating speed is fluctuating. Furthermore, the proposed method could be free from elaborate system modeling and vibration phase extraction in practice, dramatically simplifying the control system design.

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“…Ma et al [53] also developed another novel damper -the hydraulic rotational inertia damper (RID), to mitigate heave motions of semi submersible platforms. Sarkar and Fitzgerald [54] recently proposed the use of a TMDI for vibration control of spar type floating offshore wind turbine towers.…”

Section: Introductionmentioning

confidence: 99%

Tuned mass-damper-inerter (TMDI) for suppressing edgewise vibrations of wind turbine blades

Zhang

Fitzgerald

2020

Engineering Structures

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This paper proposes the use of a tuned mass-damper-inerter (TMDI) for the mitigation of edgewise blade vibrations in wind turbines. The hollow nature of the wind turbine blades is utilized to install a TMDI at a location close to the tip of each blade. A flexible multi-modal offshore wind turbine model is developed in order to study the dynamics of wind turbine blade vibrations. Uncontrolled, TMD controlled and TMDI controlled models are derived. These models are developed using the Euler-Lagrangian approach and lead to time-varying systems with the possibility of negative damping. Closed-form expressions for the optimal tuning and damping ratios of blade-mounted TMDIs are derived. Numerical simulations are then presented to demonstrate the performance of the TMDI controlled blades. The results show that TMDIs can control edgewise vibrations in wind turbine blades while requiring significantly less damper stroke than classical TMDs. The inclusion of the inerter in the damper had a significant effect on the damper stroke with reductions of up to 55% demonstrated. These impressive reductions in damper stroke come at the cost of very slightly increased blade vibration as compared to the TMD controlled case. This is a trade-off that must be considered in the design of a wind turbine.

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Vibration control of spar‐type floating offshore wind turbine towers using a tuned mass‐damper‐inerter

Cited by 116 publications

References 42 publications

Individual Blade Pitch Control of Floating Offshore Wind Turbines for Load Mitigation and Power Regulation

Individual Blade Pitch Control of Floating Offshore Wind Turbines for Load Mitigation and Power Regulation

Active fast vibration control of rotating machinery via a novel electromagnetic actuator

Tuned mass-damper-inerter (TMDI) for suppressing edgewise vibrations of wind turbine blades

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