Journal ArticleDOI
Reducing rotor speed variations of floating wind turbines by compensation of non-minimum phase zeros
TLDR
In this article, a parallel path modification is proposed to avoid instability without increasing the generator speed variation, and the results of comprehensive simulations and load calculations carried out on a benchmark wind turbine are presented.Abstract:
Applying a land-based designed pitch controller on a floating wind turbine may cause severe instability. A common strategy to overcome this problem is to reduce the closed-loop bandwidth of the pitch control system. In doing so, the generator speed variation increases possibly leading to shutdowns because of overspeed. This study uses a parallel path modification to avoid instability without increasing the generator speed variation. The results of comprehensive simulations and load calculations carried out on a benchmark wind turbine are presented. These demonstrate that by using the proposed method it is possible to apply the land-based designed pitch controller on its floater-based equivalent.read more
Citations
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Proceedings ArticleDOI
Nonlinear model predictive control of floating wind turbines with individual pitch control
TL;DR: Results show a significant blade fatigue load reduction compared to a baseline controller through minimizing yawing and pitching moments on the rotor hub while maintaining the advantages of the model predictive control approach with collective pitch control.
Journal ArticleDOI
Damping Wind and Wave Loads on a Floating Wind Turbine
TL;DR: In this paper, 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.
Journal ArticleDOI
Open-loop frequency response analysis of a wind turbine using a high-order linear aeroelastic model
TL;DR: In this paper, a high-order linear model is used to characterize the aeroelastic wind turbine dynamics that influence the open-loop frequency response from generator torque and collective pitch control actions of a modern non-floating wind turbine.
Proceedings ArticleDOI
Integrated Optimization of Floating Wind Turbine Systems
TL;DR: In this article, an exemplary methodology for the integrated conception of a floating wind turbine system with focus on the spar-type hull and the wind turbine blade-pitch-to-feather controller is presented.
Collective pitch feedforward control of floating wind turbines using lidar
TL;DR: In this paper, a collective pitch feed-forward controller for floating wind turbines is presented, which provides a pitch rate update to a conventional feedback controller based on a wind speed preview.
References
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ReportDOI
Definition of a 5-MW Reference Wind Turbine for Offshore System Development
TL;DR: In this article, a three-bladed, upwind, variable speed, variable blade-pitch-to-feather-controlled multimegawatt wind turbine model developed by NREL to support concept studies aimed at assessing offshore wind technology is described.
Book
Synthesis of feedback systems
TL;DR: Synthesis of feedback systems, Synthesis of Feedback Systems, this article, synthesis of feedback system, feedback system synthesis, feedback synthesis, synthesizing feedback systems, مرکز فناوری اطلاعات و اسلاز رسانی
Journal ArticleDOI
Overview of different wind generator systems and their comparisons
TL;DR: An overview of different wind generator systems and their comparisons are presented in this article, where the quantitative comparison and market penetration of different WG systems are presented. And the developing trends of wind generator system and appropriate comparison criteria are discussed.
ReportDOI
Dynamics Modeling and Loads Analysis of an Offshore Floating Wind Turbine
TL;DR: In this paper, the authors describe the development, verification, and application of a comprehensive simulation tool for modeling coupled dynamic responses of offshore floating wind turbines, which is used to simulate the dynamic response of wind turbines.