Modelling and control for structural load mitigation of wind turbines

The capacity of installed wind turbines have been steadily growing. In 2015 alone, 63 GW has been installed worldwide, which is 21% more capacity than what was installed in the previous year. This has been possible by larger and taller wind turbines that allow for more energy capture. To keep up wit...

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Main Author: Girsang, Irving Paul
Other Authors: Jaspreet Singh Dhupia
Format: Theses and Dissertations
Language:English
Published: 2016
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Online Access:https://hdl.handle.net/10356/67010
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-670102023-03-11T17:45:27Z Modelling and control for structural load mitigation of wind turbines Girsang, Irving Paul Jaspreet Singh Dhupia School of Mechanical and Aerospace Engineering DRNTU::Engineering::Mechanical engineering::Alternative, renewable energy sources The capacity of installed wind turbines have been steadily growing. In 2015 alone, 63 GW has been installed worldwide, which is 21% more capacity than what was installed in the previous year. This has been possible by larger and taller wind turbines that allow for more energy capture. To keep up with the trend of increasing turbine sizes and hence structural flexibility, it is important to ensure mitigation of its structural loads so that the cost of wind energy can be kept low by lessening the maintenance requirements and improving the overall turbine reliability. Compared with upgrading the mechanical system to preserve the components’ lifetime, advanced controllers have been identified as more attractive and cheaper cost reducing strategies. Implementing sophisticated control systems can assure safe and optimal operation in terms of load mitigation and power enhancement. In this thesis, several novel controller designs have been developed to mitigate fatigue loads on wind turbines’ blades and drivetrain. The controllers are designed to attenuate loads in ways that have not been paid much attention before and verified to yield superior load attenuation as compared with the ones have been achieved so far. A novel individual pitch controller (IPC) has been designed based on the new knowledge of mitigated blade loads at a yaw misaligned condition. Compared with the industrial standard pitch controller, the proposed controller is shown to contribute at least a 31.54% reduction in the blade out-of-plane fatigue load at various turbulent wind conditions. A new integrated wind turbine model that couples high-fidelity aerodynamic, structural, drivetrain and electrical models is presented. This new integration allows for consideration of the grid conditions as well as assessing the mitigation responses, in term of wind turbine loads. It can save the design costs by allowing dynamic interactions (including the controller) to be taken into account prior to physical assembly. A new controller has been designed and verified based on this integrated model to avoids drivetrain resonance through addition of virtual inertia. DOCTOR OF PHILOSOPHY (MAE) 2016-05-10T07:35:08Z 2016-05-10T07:35:08Z 2016 Thesis Girsang, I. P. (2016). Modelling and control for structural load mitigation of wind turbines. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/67010 10.32657/10356/67010 en 148 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Mechanical engineering::Alternative, renewable energy sources
spellingShingle DRNTU::Engineering::Mechanical engineering::Alternative, renewable energy sources
Girsang, Irving Paul
Modelling and control for structural load mitigation of wind turbines
description The capacity of installed wind turbines have been steadily growing. In 2015 alone, 63 GW has been installed worldwide, which is 21% more capacity than what was installed in the previous year. This has been possible by larger and taller wind turbines that allow for more energy capture. To keep up with the trend of increasing turbine sizes and hence structural flexibility, it is important to ensure mitigation of its structural loads so that the cost of wind energy can be kept low by lessening the maintenance requirements and improving the overall turbine reliability. Compared with upgrading the mechanical system to preserve the components’ lifetime, advanced controllers have been identified as more attractive and cheaper cost reducing strategies. Implementing sophisticated control systems can assure safe and optimal operation in terms of load mitigation and power enhancement. In this thesis, several novel controller designs have been developed to mitigate fatigue loads on wind turbines’ blades and drivetrain. The controllers are designed to attenuate loads in ways that have not been paid much attention before and verified to yield superior load attenuation as compared with the ones have been achieved so far. A novel individual pitch controller (IPC) has been designed based on the new knowledge of mitigated blade loads at a yaw misaligned condition. Compared with the industrial standard pitch controller, the proposed controller is shown to contribute at least a 31.54% reduction in the blade out-of-plane fatigue load at various turbulent wind conditions. A new integrated wind turbine model that couples high-fidelity aerodynamic, structural, drivetrain and electrical models is presented. This new integration allows for consideration of the grid conditions as well as assessing the mitigation responses, in term of wind turbine loads. It can save the design costs by allowing dynamic interactions (including the controller) to be taken into account prior to physical assembly. A new controller has been designed and verified based on this integrated model to avoids drivetrain resonance through addition of virtual inertia.
author2 Jaspreet Singh Dhupia
author_facet Jaspreet Singh Dhupia
Girsang, Irving Paul
format Theses and Dissertations
author Girsang, Irving Paul
author_sort Girsang, Irving Paul
title Modelling and control for structural load mitigation of wind turbines
title_short Modelling and control for structural load mitigation of wind turbines
title_full Modelling and control for structural load mitigation of wind turbines
title_fullStr Modelling and control for structural load mitigation of wind turbines
title_full_unstemmed Modelling and control for structural load mitigation of wind turbines
title_sort modelling and control for structural load mitigation of wind turbines
publishDate 2016
url https://hdl.handle.net/10356/67010
_version_ 1761781290143580160