Modelling and Analysis of Drivetrains in Offshore Wind Turbines

Nejad, Amir R.

doi:10.1002/9781119097808.ch3

Cited by 5 publications

(2 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An effective approach, which is proposed in the standard DNVGL‐ST‐ for evaluating the suitability of these parameters, is to compare the first eigenfrequencies between the detailed drivetrain model and the DTU simplified model. The first eigenfrequency of the simplified drivetrain model could be calculated via an equivalent mechanical equation, as specified by Nejad and Oyague, with the essential parameters that are presented in Table . Additionally, the first eigenfrequency of the detailed drivetrain model could be obtained by conducting modal analysis in SIMPACK.…”

Section: Resultsmentioning

confidence: 99%

On design, modelling, and analysis of a 10‐MW medium‐speed drivetrain for offshore wind turbines

2020

View full text Add to dashboard Cite

The design of a medium‐speed drivetrain for the Technical University of Denmark (DTU) 10‐MW reference offshore wind turbine is presented. A four‐point support drivetrain layout that is equipped with a gearbox with two planetary stages and one parallel stage is proposed. Then, the drivetrain components are designed based on design loads and criteria that are recommended in relevant international standards. Finally, an optimized drivetrain model is obtained via an iterative design process that minimizes the weight and volume. A high‐fidelity numerical model is established via the multibody system approach. Then, the developed drivetrain model is compared with the simplified model that was proposed by DTU, and the two models agree well. In addition, a drivetrain resonance evaluation is conducted based on the Campbell diagrams and the modal energy distribution. Detailed parameters for the drivetrain design and dynamic modelling are provided to support the reproduction of the drivetrain model. A decoupled approach, which consists of global aero‐hydro‐servo‐elastic analysis and local drivetrain analysis, is used to determine the drivetrain dynamic response. The 20‐year fatigue damages of gears and bearings are calculated based on the stress or load duration distributions, the Palmgren‐Miner linear accumulative damage hypothesis, and long‐term environmental condition distributions. Then, an inspection priority map is established based on the failure ranking of the drivetrain components, which supports drivetrain inspection and maintenance assessment and further model optimization. The detailed modelling of the baseline drivetrain model provides a basis for benchmark studies and support for future research on multimegawatt offshore wind turbines.

show abstract

Section: Resultsmentioning

confidence: 99%

On design, modelling, and analysis of a 10‐MW medium‐speed drivetrain for offshore wind turbines

2020

View full text Add to dashboard Cite

show abstract

“…The moment of inertia of the gearbox is negligible compared with the moment of inertia of the generator so that it does not have any considerable impact on the first drivetrain torsional mode. The first torsional frequency by using a two‐mass model is calculated by

f_{1}^{t o r} = \frac{1}{2 π} \sqrt[]{k_{e q} \frac{J_{r} + α^{2} J_{g e n}}{α^{2} J_{r} J_{g e n}}}, k_{e q} = \frac{α^{2} k_{r} k_{g e n}}{k_{r} + α^{2} k_{g e n}},

where

k_{e q}

is the equivalent shaft stiffness in the rotor side,

J_{r}

and

J_{g e n}

are the moment of inertia of rotor and generator,

k_{r}

and

k_{g e n}

are the shaft stiffness of rotor and generator, and

α

is inverse of the gear ratio.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of PMSG‐based drivetrain technologies for 10‐MW floating offshore wind turbines: Pros and cons in a life cycle perspective

Moghadam

Nejad

2020

Wind Energy

View full text Add to dashboard Cite

This paper presents an in depth evaluation and comparison of three different drivetrain choices based on permanent-magnet synchronous generator (PMSG) technology for 10-MW offshore wind turbines. The life cycle approach is suggested to evaluate the performance of the different under consideration drivetrain topologies. Furthermore, the design of the drivetrain is studied through optimized designs for the generator and gearbox. The proposed drivetrain analytical optimization approach supported by numerical simulations shows that application of gearbox in 10-MW offshore wind turbines can help to reduce weight, raw material cost, and size and simultaneously improve the efficiency. The possibility of resonance with the first torsional natural frequency of drivetrain for the different designed drivetrain systems, the influence of gear ratio, and the feasibility of the application for a spar floating platform are also discussed.This study gives evidence on how gearbox can mitigate the torque oscillation consequences on the other components and how the latter can influence the reliability of drivetrain. KEYWORDSdrivetrain optimization, floating offshore wind turbine, life cycle assessment, permanent-magnet synchronous generator INTRODUCTIONThe capacity of offshore wind turbines and the distance from shores is rising rapidly, so that multigigawatt offshore wind farms based on multimegawatt floating turbines show potentials to be one of the dominant sources of power production in the future. The latter is due to availability of better wind resources, less turbulence, steadier winds, and less wind shear; easier transportation of larger turbines on the sea; technological developments in power electronic converters and direct current (DC) power transmission technologies; the establishments of required market infrastructures; and technological achievements in installation of turbines in deep waters, which lead to a considerable drop in the levelized cost of energy (LCOE) of offshore wind turbines. In spite of significant improvements, there are still no unanimous decision about the drivetrain system technology in offshore wind turbines. 1,2 Offshore wind reaches to 10-MW turbines or even higher, but there are still different interests between manufacturers in the selection of drivetrain technology. One reason is that the drivetrain in wind originally comes from available experiences in other industries, which has been modified over time. The latter has then been upscaled for higher powers with some modifications to reduce the production costs and improve the dynamic response. Because the wind turbines are developed for a wide range of power in various onshore/offshore, fixed/floating, two-/three-bladed rotors, upwind/downwind, high/medium/low wind, fix/variable speed, stall/active yaw, and stall/active pitch applications, a customized design of the drivetrain for the cost reduction and performance improvement is inevitable. Therefore, there is a need for a special drivetrain design for each power class for different applicati...

show abstract

A class-imbalance-aware domain adaptation framework for fault diagnosis of wind turbine drivetrains under different environmental conditions

Lu,

Dibaj,

Gao

et al. 2024

Ocean Engineering

View full text Add to dashboard Cite

Modelling and Analysis of Drivetrains in Offshore Wind Turbines

Cited by 5 publications

References 72 publications

On design, modelling, and analysis of a 10‐MW medium‐speed drivetrain for offshore wind turbines

On design, modelling, and analysis of a 10‐MW medium‐speed drivetrain for offshore wind turbines

Evaluation of PMSG‐based drivetrain technologies for 10‐MW floating offshore wind turbines: Pros and cons in a life cycle perspective

A class-imbalance-aware domain adaptation framework for fault diagnosis of wind turbine drivetrains under different environmental conditions

Contact Info

Product

Resources

About