Further Results on Modeling, Analysis, and Control Synthesis for Offshore Wind Turbine Systems

2014 ◽  
pp. 135-155
Author(s):  
Hamid Reza Karimi ◽  
Tore Bakka
Keyword(s):  
Wind Turbine ◽  
Offshore Wind ◽  
Control Synthesis ◽  
Offshore Wind Turbine ◽  
Modeling Analysis ◽  
And Control

Individual Blade Pitch Control for Alleviation of Vibratory Loads on Floating Offshore Wind Turbines

2021 ◽  
Author(s):  
Luca Pustina ◽  
Claudio Pasquali ◽  
Jacopo Serafini ◽  
Claudio Lugni ◽  
Massimo Gennaretti
Keyword(s):  
Renewable Energy ◽  
Wind Turbine ◽  
Bending Moment ◽  
Offshore Wind ◽  
Synthesis Process ◽  
Control Synthesis ◽  
Offshore Wind Turbine ◽  
Floating Offshore Wind Turbine ◽  
Blade Root ◽  
Floating Offshore Wind Turbines

Abstract Among the renewable energy technologies, offshore wind energy is expected to provide a significant contribution for the achievement of the European Renewable Energy (RE) targets for the next future. In this framework, the increase of generated power combined with the alleviation of vibratory loads achieved by application of suitable advanced control systems can lead to a beneficial LCOE (Levelized Cost Of Energy) reduction. This paper defines a control strategy for increasing floating offshore wind turbine lifetime through the reduction of vibratory blade and hub loads. To this purpose a Proportional-Integral (PI) controller based on measured blade-root bending moment feedback provides the blade cyclic pitch to be actuated. The proportional and integral gain matrices are determined by an optimization procedure whose objective is the alleviation of the vibratory loads due to a wind distributed linearly on the rotor disc. This control synthesis process relies on a linear, state-space, reduced-order model of the floating offshore wind turbine derived from aero-hydroelastic simulations provided by the open-source tool OpenFAST. In addition to the validation of the proposed controller, the numerical investigation based on OpenFAST predictions examines also the corresponding control effort, influence on platform dynamics and expected blade lifetime extension. The outcomes show that, as a by-product of the alleviation of the vibratory out-of-plane bending moment at the blade root, significant reductions of both cumulative blade lifetime damage and sway and roll platform motion are achieved, as well. The maximum required control power is less than 1% of the generated power.

scholarly journals NON LINEAR CONTROL OF MULTI FED INDUCTION GENERETOR BASED OFFSHORE WIND TURBINE SYSTEM

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Keerthana . ◽  
Vahini . ◽  
Sahana . ◽  
Mohamed Rafi
Keyword(s):  
Wind Turbine ◽  
Electromagnetic Waves ◽  
Control Strategies ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Wind Turbine System ◽  
Phase Converter ◽  
Power Generation System ◽  
Multi Phase ◽  
And Control

Novel technique is used to improve the voltage ride of wind turbine system by using LVRT System. In most of the turbines sequence operation is a proper way to increase the capacity of electronic devices in PMDD wind power generation system. Direct Current Link are regulated in this system. Because it causes the ZSCC, which brings current oscillation, distortion of waveform, reduction in power, and interruption of Electromagnetic waves, and so on. This system gives a different methodology for offshore wind turbine system which are composed of the various control strategies applied to the multi- phase converter which can deal with mostly imbalanced. Apart from averagemodels of the turbine system MVF is used to compensate highly imbalance load but not affecting the static and dynamic response of the system. Based on the above topology, the schematic diagram of the proposed system is constructed. The simulated results of offshore wind turbine system will show the advantages of the proposed system and control strategies.

scholarly journals Using Multiple Fidelity Numerical Models for Floating Offshore Wind Turbine Advanced Control Design

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2484 ◽  
Author(s):  
Joannes Olondriz ◽  
Wei Yu ◽  
Josu Jugo ◽  
Frank Lemmer ◽  
Iker Elorza ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Numerical Models ◽  
Offshore Wind ◽  
Control Technique ◽  
Offshore Wind Turbine ◽  
Floating Offshore Wind Turbine ◽  
Tuning Process ◽  
And Control ◽  
Elastic Simulation ◽  
Turbine Model

This paper summarises the tuning process of the Aerodynamic Platform Stabiliser control loop and its performance with Floating Offshore Wind Turbine model. Simplified Low-Order Wind turbine numerical models have been used for the system identification and control tuning process. Denmark Technical University’s 10 MW wind turbine model mounted on the TripleSpar platform concept was used for this study. Time-domain simulations were carried out in a fully coupled non-linear aero-hydro-elastic simulation tool FAST, in which wind and wave disturbances were modelled. This testing yielded significant improvements in the overall Floating Offshore Wind Turbine performance and load reduction, validating the control technique presented in this work.

scholarly journals Passive Control of a Pentapod Offshore Wind Turbine Under Earthquakes by Using Tuned Mass Damper

2017 ◽  
Author(s):  
Wenhua Wang ◽  
Zhen Gao ◽  
Xin Li ◽  
Torgeir Moan ◽  
Bin Wang
Keyword(s):  
Wind Turbine ◽  
Seismic Waves ◽  
Passive Control ◽  
Element Model ◽  
Tuned Mass Damper ◽  
Dynamic Responses ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Mass Damper ◽  
And Control

The finite element model (FEM) of a pentapod offshore wind turbine (OWT) is established in the newly compiled FAST. The dynamic responses of the OWT are analyzed in detail. Further, a tuned mass damper as a passive control strategy is applied in order to reduce the OWT responses under seismic loads. The influence of the tuned mass damper (TMD) locations, mass and control frequencies on the reduction of OWT responses are investigated. A general configuration of TMD can effectively reduce the local and global responses to some degree, but due to the complexity of characteristics of the OWT structure and seismic waves, the single TMD can not obtain consistent controlling effects.

Analysis and Control of a Self-Contained Hydraulic Winch Drive

2018 ◽  
Author(s):  
Lasse Schmidt ◽  
Henrik C. Pedersen ◽  
Viktor H. Donkov ◽  
Torben O. Andersen
Keyword(s):  
Wind Turbine ◽  
Oil And Gas ◽  
Control Valve ◽  
Offshore Wind ◽  
Installation Space ◽  
Offshore Wind Turbine ◽  
Flow Control Valve ◽  
Gas Drilling ◽  
Fishing Vessels ◽  
And Control

This paper is considering the analysis and control of a self-contained hydraulic winch drive. Winch drives are used in various industries, and especially in offshore and marine applications such as fishing vessels, active heave compensation applications, cranes, oil- and gas drilling rigs, vessels for wind turbine installation and so forth. When high loads are present, such winches are typically actuated by use of hydraulics, and a main disadvantage of hydraulic actuation compared to electrical actuation is the potentially large installation space required due to the hydraulic power unit. In this paper the analysis of- and control design for a self-contained hydraulic winch drive are considered. The drive includes a single supply pump, fixed displacement motor, flow control valve, a boot-strap reservoir and integrated boost-flow functionality. Emphasis is placed on the analysis of the highly coupled dynamics, an approach to decouple the dynamics and a robust control structure able to handle various types of loads aided by model reference generation. The motion performance and robustness properties are demonstrated through simulation results, when the system is subjected to a strongly varying external load and motion reference from an offshore wind turbine blade installation system.

scholarly journals Virtual Prototyping of a Low-Height Lifting System for Offshore Wind Turbine Installation

2020 ◽  
Author(s):  
Jiafeng Xu ◽  
Behfar Ataei ◽  
Karl Henning Halse ◽  
Hans Petter Hildre ◽  
Egil Tennfjord Mikalsen
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Simulation Software ◽  
Economic Feasibility ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
General Arrangement ◽  
Lifting System ◽  
And Control ◽  
Offshore Crane

Abstract Due to the ever higher demands from the energy market, the quantity, dimension and power capacity of newly installed offshore wind turbines are continuously increasing. In terms of logistical management, economic feasibility and engineering difficulty, the traditional installation methods, predominantly represented by using Jack-up vessel and offshore cranes, will hit their limitations soon in the future. Offshore turbines have a relatively fixed geometric profile and physical characteristics: a slender cylindrical tower with huge blades attached on the top end. In this work, we exploited these features and designed a low-height lifting system for deploying wind turbine onto a floating spar platform. The low-height lifting system lifts the wind turbine with wires attached to the bottom of the tower, and keeps the balance of the tower with extra tug lines on the mid-section. The wires and tug lines are controlled by an active 6DOF compensation system. The low-height lifting system removes the necessity of a huge offshore crane onboard and can scale well to even larger wind turbines. The design is virtual prototyped in the simulator of Offshore Simulator Centre using FATHOM simulation software. Different design configurations are discussed in terms of the general arrangement, system dimensions and control methods.

scholarly journals Use of Kane’s Method for Multi-Body Dynamic Modelling and Control of Spar-Type Floating Offshore Wind Turbines

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6635
Author(s):  
Saptarshi Sarkar ◽  
Breiffni Fitzgerald
Keyword(s):  
Wind Turbine ◽  
Equations Of Motion ◽  
Dynamic Modelling ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Kane’S Method ◽  
Kane's Method ◽  
Floating Offshore Wind Turbines ◽  
Multi Body ◽  
And Control

This paper demonstrates the use of Kane’s method to derive equations of motion for a spar-type floating offshore wind turbine taking into account the flexibility of the members. The recently emerged Kane’s method reduces the effort required to derive equations of motion for complex multi-body systems, making them simpler to model and more readily solved by computers. Further, the installation procedure of external vibration control devices on the wind turbine using Kane’s method is described, and the ease of using this method has been demonstrated. A tuned mass damper inerter (TMDI) is installed in the tower for illustration. The excellent vibration mitigation properties of the TMDI are also presented in this paper.

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