Theoretical study and experimental verification of vibration control of offshore wind turbines by a ball vibration absorber

Zhang, Zili; Chen, Jianbing; Li, Jie

doi:10.1080/15732479.2013.792098

Cited by 69 publications

(36 citation statements)

References 17 publications

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“…The coupling is indirectly via the pitch controller performance, which changes the effective angle of attack and the corresponding aerodynamic loads on the blade sections. Figure 10c shows an interesting result that the edgewise vibration q 4 (t) is slightly suppressed by the active generator control due to the coupling of edgewise vibration to the lateral tower vibration, as shown in Equation (6). The maximum response and the standard deviation are reduced by 5.5% and 5.0%, respectively.…”

Section: Gear-driven Wind Turbinementioning

confidence: 62%

“…It is seen from the last part of the two sub-equations in Equation (14) that for gear-driven wind turbines, there are extra coupling terms between the degree of freedom q 9 (t) and the two DOFs of the drivetrain, which can be transferred and added to the stiffness matrix in Equation (6). Based on the relationship between f 9 (t) and f 13 (t) in Equations (14) and (15), the lateral tower vibrations can be controlled by specifying the format of the generator torque f 13 (t), as will be shown in the subsequent section.…”

Section: Torque Transfer Mechanism Between the Drivetrain And The Towermentioning

confidence: 99%

“…To yield more realistic results, an advanced modeling tool has been developed and incorporated into the aeroelastic code, FAST (Fatigue, Aerodynamics, Structures and Turbulence), allowing the investigation of passive TMDs in vibration control of offshore wind turbine systems [5]. Recently, a series of shaking table tests have been carried out to evaluate the effect of the ball vibration absorber (BVA) on the vibration mitigation of a reduced scale wind turbine model, which proves the effectiveness of the passive damping device [6]. However, the focus of this study is still on along-wind vibrations without considering the aerodynamic damping.…”

Section: Introductionmentioning

confidence: 99%

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Dynamics and Control of Lateral Tower Vibrations in Offshore Wind Turbines by Means of Active Generator Torque

et al. 2014

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Lateral tower vibrations of offshore wind turbines are normally lightly damped, and large amplitude vibrations induced by wind and wave loads in this direction may significantly shorten the fatigue life of the tower. This paper proposes the modeling and control of lateral tower vibrations in offshore wind turbines using active generator torque. To implement the active control algorithm, both the mechanical and power electronic aspects have been taken into consideration. A 13-degrees-of-freedom aeroelastic wind turbine model with generator and pitch controllers is derived using the Euler-Lagrangian approach. The model displays important features of wind turbines, such as mixed moving frame and fixed frame-defined degrees-of-freedom, couplings of the tower-blade-drivetrain vibrations, as well as aerodynamic damping present in different modes of motions. The load transfer mechanisms from the drivetrain and the generator to the nacelle are derived, and the interaction between the generator torque and the lateral tower vibration are presented in a generalized manner. A three-dimensional rotational sampled turbulence field is generated and applied to the rotor, and the tower is excited by a first order wave load in the lateral direction. Next, a simple active control algorithm is proposed based on active generator torques with feedback from the measured lateral tower vibrations. A full-scale power converter configuration with a cascaded loop control structure is also introduced to produce the feedback control torque in real time. Numerical simulations have been carried out using Energies 2014, 7 7747 data calibrated to the referential 5-MW NREL (National Renewable Energy Laboratory) offshore wind turbine. Cases of drivetrains with a gearbox and direct drive to the generator are considered using the same time series for the wave and turbulence loadings. Results show that by using active generator torque control, lateral tower vibrations can be significantly mitigated for both gear-driven and direct-driven wind turbines, with modest influence on the smoothness of the power output from the generator.

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Section: Gear-driven Wind Turbinementioning

confidence: 62%

Section: Torque Transfer Mechanism Between the Drivetrain And The Towermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamics and Control of Lateral Tower Vibrations in Offshore Wind Turbines by Means of Active Generator Torque

et al. 2014

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“…A simple two-mass model was used in this study. Another important damping device is ball vibration absorber (BVA) which was first investigated by Pirner [ suppression theoretically and experimentally [107]. The BVA consists of a steel ball, an arc path and two steel plates which prevent the ball slides aside.…”

Section: Other Vibration Control Dampersmentioning

confidence: 99%

Performance enhancement of wind turbine systems with vibration control: A review

Rahman

Ong

Chong

et al. 2015

Renewable and Sustainable Energy Reviews

104

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“…This applies in particular to the high-rise buildings, television towers, radio masts, chimneys [1][2][3][4][5][6][7][8][9][10][11], largepower transmission lines [12][13][14][15][16][17][18][19], carrying trunks of wind power plants, cable-stayed bridges [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modeling of the Process of Vibration Protection in a System with two-mass Damper Pendulum

Hu¹,

Legeza²,

Dychka³

et al. 2017

IJISA

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Theoretical study and experimental verification of vibration control of offshore wind turbines by a ball vibration absorber

Cited by 69 publications

References 17 publications

Dynamics and Control of Lateral Tower Vibrations in Offshore Wind Turbines by Means of Active Generator Torque

Dynamics and Control of Lateral Tower Vibrations in Offshore Wind Turbines by Means of Active Generator Torque

Performance enhancement of wind turbine systems with vibration control: A review

Mathematical Modeling of the Process of Vibration Protection in a System with two-mass Damper Pendulum

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