Dynamic analysis and control of support structures for offshore wind turbines
01 May 2014-pp 169-174
TL;DR: In this article, the authors developed robust control techniques so as to regulate the vibration and synchronization of support structures for an offshore wind turbine to achieve the same, two methods the sliding mode controller and a control mechanism based on altering the oscillation energy are being proposed.
Abstract: Offshore wind power is a promising technology and is important from the future energy demand Energy from the offshore wind can be a potential source of renewable energy which is capable of meeting our needs Research is still underway for addressing the several challenges associated with this technology and one of them is the unwanted response of support structures for wind turbines Offshore wind turbines are located in severe environment and experience environmental loads like wind, wave, current and seismic excitations The support structures when subjected to the loads exhibit the nonlinear response Owing to the irregular waves, the response will often be chaotic which in turn reduces the overall stability of the turbine A 5MW NREL wind turbine is considered for the study The turbine is assumed to be installed on a floating platform with water depths of 320 m To keep the response in safe operating regime, the controlled response of offshore structure is essential The focus of this paper is to develop robust control techniques so as to regulate the vibration and synchronization of support structures for an offshore wind turbine To achieve the same, two methods the sliding mode controller and a control mechanism based on altering the oscillation energy are being proposed The performance of the algorithms is illustrated in this paper by designing the controllers for controlled response of the structures supporting offshore wind turbines in the chaotic regime The performances of controllers are compared with general back steeping control methodology based on Lyapunov stability theory Numerical results and simulations are shown to validate the proposed methodology and to demonstrate its effectiveness
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01 Jan 2016
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54 citations
TL;DR: An improved model based on the vibration signal analysis to investigate the onshore wind turbine dynamic behavior is proposed and results show that the proposed model is accurate and practical for dynamic property analysis of wind turbine.
Abstract: Considering the complexity structure of wind turbines, it is difficult to establish an accurate model for wind turbines. This article proposed an improved model based on the vibration signal analys...
12 citations
TL;DR: A novel fixed-time adaptive sliding mode control scheme with a state observer to synchronize chaotic support structures for offshore wind turbines in the presence of matched parametric uncertainties is proposed.
Abstract: The chaotic support structures for offshore wind turbines are often subjected to a severe environment. A robust control scheme needs to be considered to maintain them in a safe operational limit. Robust sliding mode control (SMC) scheme can provide an excellent robust controller against this severe and challenging environment for these chaotic structures. This paper proposes a novel fixed-time adaptive sliding mode control scheme with a state observer to synchronize chaotic support structures for offshore wind turbines in the presence of matched parametric uncertainties. The proposed controller is a new integration of adaptive control concept, SMC method, fixed-time stability concept and a state observer. A fixed-time stability concept is used to provide stability for the system within a presented time regardless of initial conditions. The adaptive concept is utilized to provide an online estimator of the uncertain upper bound. Also, a nonlinear observer is employed to provide an online estimator of an unmeasured state in the controller. Lyapunov stability theorem is used to analyze fixed-time stability of the system based on SMC methodology. The simulation results demonstrate that the proposed controller is able to ensure fixed-time synchronization along with providing precise means to estimate the unmeasured state as well as uncertainty upper bound.
8 citations
TL;DR: In this article, the short term extreme response of a spar offshore 5MW NREL benchmark wind turbine is predicted for 600 s. The wave spectrum has significant wave height 6m and peak spectral period 10s and follows Pierson- Moskowitz spectrum.
5 citations
TL;DR: In this article, a proportional integral (PI) control algorithm was proposed to control the pitch angle of a 5 MW NREL offshore wind turbine in a LABVIEW environment, where the turbine is assumed to be installed in water depth of 320 m on a spar platform.
4 citations
References
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TL;DR: Design and analysis forVariable structure systems are surveyed in this paper and it is shown that advantageous properties result from changing structures according to this switching logic.
Abstract: Variable structure systems consist of a set of continuous subsystems together with suitable switching logic. Advantageous properties result from changing structures according to this switching logic. Design and analysis for this class of systems are surveyed in this paper.
5,076 citations
"Dynamic analysis and control of sup..." refers background in this paper
...1) Overview of Sliding Mode Control: Sliding mode control (SMC) or variable structure control [12]–[15] is a nonlinear control approach....
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01 Feb 2009
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.
Abstract: This report describes 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.
4,194 citations
"Dynamic analysis and control of sup..." refers background or methods in this paper
...Wind is movement of air and possesses kinetic energy which can be converted to other forms of energy [1], [2]....
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...For calculating the wind loads, the turbulence about the mean wind speed was numerically generated by Turbsim [2]....
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TL;DR: A tutorial account of variable structure control with sliding mode is presented, introducing in a concise manner the fundamental theory, main results, and practical applications of this powerful control system design approach.
Abstract: A tutorial account of variable structure control with sliding mode is presented. The purpose is to introduce in a concise manner the fundamental theory, main results, and practical applications of this powerful control system design approach. This approach is particularly attractive for the control of nonlinear systems. Prominent characteristics such as invariance, robustness, order reduction, and control chattering are discussed in detail. Methods for coping with chattering are presented. Both linear and nonlinear systems are considered. Future research areas are suggested and an extensive list of references is included. >
2,884 citations
01 May 2010
TL;DR: In this article, the authors present the specifications of an offshore floating wind turbine, which are needed by the participants for building aero-hydro-servo-elastic models during the IEA Annex XXIII Offshore Code Comparison Collaboration (OC3).
Abstract: Phase IV of the IEA Annex XXIII Offshore Code Comparison Collaboration (OC3) involves the modeling of an offshore floating wind turbine. This report documents the specifications of the floating system, which are needed by the OC3 participants for building aero-hydro-servo-elastic models.
515 citations
"Dynamic analysis and control of sup..." refers background or methods in this paper
...The equation of motion of above structure in the time domain can be written as follows [4]:...
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...2) Environmental condition and dynamic analysis: Dynamic analysis of the plant was carried out for the water depth of 320𝑚 using FAST....
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...The hydrodynamic added mass, the damping and exciting forces are obtained using ANSYS-AQWA and are combined with aerodynamic model to have a coupled aero-servo-hydro-elastic model in FAST [4]....
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...Under these loads, the wind turbine system under the constraints imposed by support structure experience different motions than that of onshore turbines [4], [5]....
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...However, the non linear dynamics of offshore platforms has attracted much attention over the last several years [4]....
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Book•
01 Jan 2009
TL;DR: In this article, a state-of-the-art guide to wind turbine engineering can be found to examine real-life choices made by inventors, designers, and builders of turbines; absorb their practical lessons; and synthesize the experiences of a wide range of wind energy professionals.
Abstract: This state-of-the-art guide to wind turbine engineering lets you: examine the real-life choices made by inventors, designers, and builders of turbines; absorb their practical lessons; and synthesize the experiences of a wide range of wind-energy professionals. You get technical expertise on a wide range of material, including advances in aerodynamics, structural dynamics and fatigue, wind characteristics, acoustic and electromagnetic emissions, commercial wind power applications, and utility power systems. Packed with applications-oriented advice -- and including numerous graphics and numerical examples -- this authoritative volume provides uniform terminology, nomenclature, and graphic style, as well as widespread cross-referencing. Covering design concepts and philosophies, research and demonstration projects, and the integration of wind power plants into electrical utility systems, Wind Turbine Technology is both a practical reference and a classroom text.
363 citations