Dissertations / Theses on the topic 'Wind turbines – Automatic control'
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Rodríguez, D'Derlée Johel José. "Control strategies for offshore wind farms based on PMSG wind turbines and HVdc connection with uncontrolled rectifier." Doctoral thesis, Universitat Politècnica de València, 2013. http://hdl.handle.net/10251/34510.
Full textRodríguez D'derlée, JJ. (2013). Control strategies for offshore wind farms based on PMSG wind turbines and HVdc connection with uncontrolled rectifier [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/34510
TESIS
Santos, Richard A. "Damage mitigating control for wind turbines." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3256394.
Full textTong, Xin. "Control of large offshore wind turbines." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/99841/.
Full textLee, Donghoon. "Multi-flexible-body analysis for applications to wind turbine control design." Diss., Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04052004-180040/unrestricted/lee%5Fdonghoon%5F200312%5Fphd.pdf.
Full textFégeant, Olivier. "Noise from wind turbines /." Stockholm, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3100.
Full textLindeberg, Eivind. "Optimal Control of Floating Offshore Wind Turbines." Thesis, Norwegian University of Science and Technology, Department of Engineering Cybernetics, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9933.
Full textFloating Offshore Wind Power is an emerging and promising technology that is particularly interesting from a Norwegian point of view because of our long and windy coast. There are however still several remaining challenges with this technology and one of them is a possible stability problem due to positive feedback from tilt motion of the turbine tower. The focus of this report is to develope a simulator for a floating offshore wind turbine that includes individual, vibrating blades. Several controllers are developed, aiming to use the blade pitch angle and the generator power to control the turbine speed and output power, while at the same time limit the low-frequent motions of the tower and the high-frequent motions of the turbine blades. The prime effort is placed on developing a solution using Model Predictive Control(MPC). On the issue of blade vibrations no great progress has been made. It is not possible to conclude from the simulation results that the designed controllers are able to reduce the blade vibrations. However, the MPC controller works very well for the entire operating range of the turbine. A "fuzzy"-inspired switching algorithm is developed and this handles the transitions between the different operating ranges of the turbine convincingly. The problem of positive feedback from the tower motion is handled well, and the simulations do not indicate that this issue should jeopardize the viability of floating offshore wind turbines.
Cantoni, Lorenzo. "Load Control Aerodynamics in Offshore Wind Turbines." Thesis, KTH, Kraft- och värmeteknologi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-291417.
Full textPå grund av ökningen av rotorstorleken hos horisontella vindturbiner (HAWT) under de senaste 25 åren, en design som har uppstod för att uppnå högre effekt, måste alla vindkraftkomponenter och blad stå emot högre strukturella belastningar. Detta uppskalningsproblem kan lösas genom att använda metoder som kan minska aerodynamiska belastningar som rotorn måste tåla, antingen med passiva eller aktiva styrlösningar. Dessa kontrollanordningar och tekniker kan minska utmattningsbelastningen på bladen med upp till 40 % och därför behövs mindre underhåll, vilket resulterar i viktiga besparingar för vindkraftsägaren. Detta projekt består av en studie av lastkontrolltekniker för havsbaserade vindkraftverk ur en aerodynamisk och aeroelastisk synvinkel, i syfte att bedöma en kostnadseffektiv, robust och pålitlig lösning som kan fungera underhållsfri i tuffa miljöer. Den första delen av denna studie involverar 2D- och 3D-aerodynamiska och aeroelastiska simuleringar för att validera beräkningsmodellen med experimentella data och för att analysera interaktionen mellan fluiden och strukturen. Den andra delen av denna studie är en bedömning av de ojämna aerodynamiska belastningarna som produceras av ett vindkast över bladen och för att verifiera hur en bakkantklaff skulle påverka de aerodynamiska styrparametrarna för det valda vindturbinbladet.
Goodfellow, David. "Variable speed operation of wind turbines." Thesis, University of Leicester, 1986. http://hdl.handle.net/2381/7822.
Full textMomsen, Timothy Benjamin. "Hybrid additive manufacturing platform for the production of composite wind turbine blade moulds." Thesis, Nelson Mandela Metropolitan University, 2017. http://hdl.handle.net/10948/19091.
Full textFeng, Xiaoran. "Predictive control approaches to fault tolerant control of wind turbines." Thesis, University of Hull, 2014. http://hydra.hull.ac.uk/resources/hull:10517.
Full textPolverini, Silvia. "Analysis and control of floating offshore wind turbines." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13883/.
Full textGase, Zachary M. "Below-Rated Control of Swept-Blade Wind Turbines." Scholarly Commons, 2016. https://scholarlycommons.pacific.edu/uop_etds/225.
Full textStock, Adam. "Augmented control for flexible operation of wind turbines." Thesis, University of Strathclyde, 2015. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=25253.
Full textDadashnialehi, Ehsan. "Modeling And Control of Variable Speed Wind Turbines." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1356372607.
Full textTrevelyan, Conrad. "Application of circulation control aerofoils to wind turbines." Thesis, Loughborough University, 2002. https://dspace.lboro.ac.uk/2134/34575.
Full textZhang, Zijun. "Performance optimization of wind turbines." Diss., University of Iowa, 2012. https://ir.uiowa.edu/etd/3024.
Full textHögberg, Lars. "Automated electric control of a vertical axis wind turbine in island operation." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-162559.
Full textMassey, Jason G. "Doubly fed induction machine control for wind energy conversion." Thesis, Monterey, Calif. : Naval Postgraduate School, 2009. http://handle.dtic.mil/100.2/ADA501680.
Full textThesis Advisor(s): Julian, Alexander L. "June 2009." Description based on title screen as viewed on July 10, 2009. DTIC Identifiers: Wind energy conversion system, DFIG (Double Fed Induction Generator), VSI (Voltage Source Inverter), SVM (Space Vector Modulation), wind turbine, FPGA (Field Programmable Gate Array). Author(s) subject terms: Double Fed Induction Generator (DFIG), Voltage Source Inverter (VSI), Space Vector Modulation (SVM), Wind Turbine, Field Programmable Gate Array (FPGA), Wind Energy Conversion System. Includes bibliographical references (p. 91). Also available in print.
Simley, Eric J. "Wind Speed Preview Measurement and Estimation for Feedforward Control of Wind Turbines." Thesis, University of Colorado at Boulder, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3721887.
Full textWind turbines typically rely on feedback controllers to maximize power capture in below-rated conditions and regulate rotor speed during above-rated operation. However, measurements of the approaching wind provided by Light Detection and Ranging (lidar) can be used as part of a preview-based, or feedforward, control system in order to improve rotor speed regulation and reduce structural loads. But the effectiveness of preview-based control depends on how accurately lidar can measure the wind that will interact with the turbine.
In this thesis, lidar measurement error is determined using a statistical frequency-domain wind field model including wind evolution, or the change in turbulent wind speeds between the time they are measured and when they reach the turbine. Parameters of the National Renewable Energy Laboratory (NREL) 5-MW reference turbine model are used to determine measurement error for a hub-mounted circularly-scanning lidar scenario, based on commercially-available technology, designed to estimate rotor effective uniform and shear wind speed components. By combining the wind field model, lidar model, and turbine parameters, the optimal lidar scan radius and preview distance that yield the minimum mean square measurement error, as well as the resulting minimum achievable error, are found for a variety of wind conditions. With optimized scan scenarios, it is found that relatively low measurement error can be achieved, but the attainable measurement error largely depends on the wind conditions. In addition, the impact of the induction zone, the region upstream of the turbine where the approaching wind speeds are reduced, as well as turbine yaw error on measurement quality is analyzed.
In order to minimize the mean square measurement error, an optimal measurement prefilter is employed, which depends on statistics of the correlation between the preview measurements and the wind that interacts with the turbine. However, because the wind speeds encountered by the turbine are unknown, a Kalman filter-based wind speed estimator is developed that relies on turbine sensor outputs. Using simulated lidar measurements in conjunction with wind speed estimator outputs based on aeroelastic simulations of the NREL 5-MW turbine model, it is shown how the optimal prefilter can adapt to varying degrees of measurement quality.
Poole, Sean. "The development of a segmented variable pitch small horizontal axis wind turbine with active pitch control." Thesis, Nelson Mandela Metropolitan University, 2013. http://hdl.handle.net/10948/d1020583.
Full textTutivén, Gálvez Christian. "Fault detection and fault tolerant control in wind turbines." Doctoral thesis, Universitat Politècnica de Catalunya, 2018. http://hdl.handle.net/10803/663289.
Full textLa energía renovable es una energía sustentable importante en el mundo. Hasta ahora, como parte esencial de la energía de bajas emisiones en muchos países, la energía renovable ha sido importante para la seguridad energética nacional, y jugó un papel importante en la reducción de las emisiones de carbono. Proviene de recursos naturales, como el viento, la energía solar, la lluvia, las mareas, la biomasa y el calor geotérmico. Entre ellos, la energía eólica está emergiendo rápidamente como una tecnología sostenible de bajo carbono, eficiente en el uso de los recursos y rentable en el mundo. Debido a la demanda de instalaciones de producción de mayor potencia con menos impactos ambientales, el aumento continuo en el tamaño de las turbinas eólicas y las tecnologías offshore (flotantes) recientemente desarrolladas han llevado a nuevos desafíos en los sistemas de turbinas eólicas. Las turbinas eólicas son sistemas complejos con grandes estructuras flexibles que funcionan en condiciones ambientales muy turbulentas e impredecibles para una red eléctrica variable. La maximización de los sistemas de conversión de energía eólica, los problemas de minimización de la fatiga mecánica, los costos por kilovatios-hora de estrategias de reducción, cuestiones de confiabilidad, problemas de estabilidad y disponibilidad (sostenibilidad) exigen el uso de sistemas avanzados de control cooperativo (multivariable y multiobjetivo) para regular variables tales como paso, par, potencia, velocidad del rotor, factores de potencia de cada aerogenerador, etc. Mientras tanto, con las crecientes demandas de eficiencia y calidad del producto y la progresiva integración de los sistemas de control automático en los procesos de alto costo y de seguridad crítica, los campos de detección y aislamiento de fallos (FDI) y control tolerante a fallos (FTC) juegan un papel importante. Esta tesis cubre el desarrollo teórico y también la implementación de diferentes técnicas de FDI y FTC en turbinas eólicas. El propósito de los sistemas FDI es detectar y ubicar las degradaciones y fallos en la operación de los componentes tan pronto como sea posible, de modo que las operaciones de mantenimiento puedan realizarse a su debido tiempo (por ejemplo, durante periodos con baja velocidad del viento). Por lo tanto, se puede reducir el número de costosas acciones de mantenimiento correctivo y, en consecuencia, se reduce al mínimo la pérdida de producción de energía eólica debido a las operaciones de mantenimiento. El objetivo de la FTC es diseñar controladores apropiados de modo que el sistema de bucle cerrado resultante pueda tolerar operaciones anormales de componentes de control específicos y retener la estabilidad general del sistema con un rendimiento aceptable del sistema. Diferentes contribuciones de FDI y FTC se presentan en esta tesis y se publican en diferentes revistas indexadas a JCR y en congresos internacionales. Estas contribuciones abarcan una amplia gama de fallos WTs realistas, así como diferentes tipos de turbinas (en tierra, en alta mar ancladas al fondo del mar y flotantes). El rendimiento de las contribuciones propuestas se prueba en simulaciones con el código aeroelástico FAST.
Schlipf, David [Verfasser]. "Lidar-Assisted Control Concepts for Wind Turbines / David Schlipf." München : Verlag Dr. Hut, 2016. http://d-nb.info/1094117714/34.
Full textCardenas-Dobson, Roberto. "Control of wind turbines using a switched reluctance generator." Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320626.
Full textSoraghan, Conaill Eoin. "Aerodynamic modelling and control of vertical axis wind turbines." Thesis, University of Strathclyde, 2014. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=23210.
Full textWang, Chen. "Control, stability analysis and grid integration of wind turbines." Thesis, Imperial College London, 2008. http://hdl.handle.net/10044/1/1291.
Full textRobotham, Antony John. "The aerodynamic control of the V-type vertical axis wind turbine." n.p, 1989. http://ethos.bl.uk/.
Full textSánchez, Sardi Héctor Eloy. "Prognostics and health aware model predictive control of wind turbines." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/463321.
Full textEls components dels aerogeneradors estan sotmesos a considerable estrès i fatiga, degut a les condicions ambientals extremes a les quals estan exposats, especialment els localitzats en alta mar. Per aquest motiu, al comunitat científica durant els últims anys ha investigat les averies més comunes presents en els aerogeneradors, fet que ha portat a proposar un cas d'estudi de diagnosi i control tolerant de fallades que inclou un conjunt de fallades que afecten a diversos components dels aerogeneradors. Aquesta tesi presenta algunes contribucions en els camps de la diagnosi de fallades, el control tolerant de fallades i la prognosi, així com la seva integració amb el control d'aerogeneradors, fet que ha portat a proposar una tècnica de control anomenada control predictiu basada en models conscients de la salut del sistema (HAMPC). Concretament les aportacions es poden resumir en: - Diagnosi de fallades basada en models: per a la detecció s'utilitzen observadors intervalars i l'aïllament de la fallada es fa en base el conjunt d'ARRs obtinguts de l'anàlisi estructural i de la matriu de signatures de fallades que relaciona les ARRs amb les fallades. - Control tolerant de fallades: es proposa un esquema de control tolerant a fallades que integra la detecció de fallades i algoritme d'acomodació de fallades, i té per objectiu evitar l'augment de càrregues en la pala i la torre quan es produeix una fallada en el sensor azimuth quan es fa un control individual de la inclinació de les pales (IPC). - Prognosi de la fatiga i la degradació de les pales: la fatiga s'avalua amb un algorisme denominat "rainflow counting" amb el qual es fa estimació del dany acumulat i per a la degradació es fa servir un model de degradació de la rigidesa del material amb el qual es fan prediccions de la vida útil restant (RUL). - Control de la salut d'aerogeneradors: s'ha integrat la gestió de la salut del sistema basat en danys per fatiga o prediccions de RUL amb control predictiu basat en models (MPC) donant lloc al control que anomenem HAMPC. Les contribucions presentades en aquesta tesi han sigut validades en un cas d'estudi d'aerogeneradors basat en un aerogenerador de referència de 5MW de potència implementat en el simulador d'aerogeneradors d'alta fidelitat conegut amb el nom de FAST.
Iqbal, Muhammad Tariq. "Dynamic control strategies for fixed and variable speed wind turbines." Thesis, Imperial College London, 1994. http://hdl.handle.net/10044/1/7737.
Full textHomer, Jeffrey R. "Physics-based control-oriented modelling for floating offshore wind turbines." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/54891.
Full textApplied Science, Faculty of
Mechanical Engineering, Department of
Graduate
Rogers, Mary C. M. "Control aspects of integrated design of wind turbines : a foundation." Thesis, University of Strathclyde, 1998. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21367.
Full textAl-Toma, Ahmed Selman Hadi. "Hybrid control schemes for permanent magnet synchronous generator wind turbines." Thesis, Brunel University, 2017. http://bura.brunel.ac.uk/handle/2438/15194.
Full textMorshed, Mohammad Javad. "Fault Ride-Through Control Paradigms for DFIG-Based Wind Turbines." Thesis, University of Louisiana at Lafayette, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=10811697.
Full textThis dissertation designs three different fault ride through (FRT) approaches to improve the performance of DFIG based WT during voltage sag conditions. First, an integral terminal sliding mode controller (ITSMC) was implemented for the rotor-side converter (RSC) and grid-side converter (GSC), and a fuzzy logic and a Posicast approach are also proposed to control the series grid side converter (SGSC). In the second approach, a fuzzy second order integral terminal sliding mode (FSOITSMC) approach for both RSC and GSC, along with a FSOITSMC-based Posicast controller for the SGSC, which is placed in series with the DFIG, have been applied to enhance the DFIG?s performance. Lastly, a fault ride through design has been applied for hybrid PV-Wind power generation systems. In the proposed configuration, the PV system was connected to the DC-link of the DFIG through a DC-DC converter. During voltage sag conditions, an SGSPI protection system is activated while the GSC acted as a STATCOM, thus injecting reactive power to the grid. The effectiveness of the proposed fault tolerant configuration approaches in riding through different types of grid faults is evaluated via detailed computer experiments. The merits of the proposed approach are further compared to those of the standard state of the art in voltage sag mitigation. Results clearly show that the proposed control paradigm is able to protect the converters from damages and ensure continuous connection of the WT to the grid during faults, hence maintaining power quality.
Zhang, Cheng. "A contribution to the nonlinear control of floating wind turbines." Thesis, Ecole centrale de Nantes, 2021. http://www.theses.fr/2021ECDN0009.
Full textFloating wind turbines allow the use of the abundant wind resource in ocean area and are considered as a promising solution of renewable energy. However, due to the additional dynamics (especially the platform pitch motion) introduced by the floating platform, the control of a floating wind turbine must take such pitch motion into consideration to stabilize the system meanwhile optimizing the power output. This work is dedicated to the nonlinear control of floating wind turbines in region III, this class of controllers requiring reduced knowledge of system modeling and parameter. The control objectives are to maintain the power output at its rated value, to reduce the platform pitch motion and to limit the fatigue load. Firstly, a simplified adaptive super-twisting is proposed. Then, by using collective blade pitch control, this algorithm and other adaptive high order sliding model algorithms are applied on a nonlinear floating wind turbine model. Secondly, a permanent magnet synchronous generator is supposed to be installed in the floating wind turbine. Both collective blade pitch control and generator torque control based on adaptive high-order sliding mode control are used to achieve the control objectives. Thirdly, individual blade pitch control combined with collective blade pitch control is employed. Such algorithm further reduces the fatigue load of blades. Finally, the proposed simplified adaptive super-twisting algorithm is validated on an experimental floating wind turbine set-up (with a spar-buoy platform) in a wave tank, and the control performances are evaluated versus linear control approaches such as gain-scheduled PI and linear–quadratic regulators
Rossander, Morgan. "Electromechanics of Vertical Axis Wind Turbines." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-331844.
Full textBourlis, Dimitrios. "Control algorithms and implementation for variable speed stall regulated wind turbines." Thesis, University of Leicester, 2011. http://hdl.handle.net/2381/28800.
Full textBagherieh, Omid. "Gain-scheduling control of floating offshore wind turbines on barge platforms." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44879.
Full textCollet, David. "Fatigue-oriented data-driven individual pitch control strategies of wind turbines." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALT063.
Full textHorizontal axis wind turbines are the leading figure of the wind energy industry and is becoming a mature technology. Even though wind energy is globally trending, the yearly number of wind turbines installed is weakening in some countries, due to the reduction of economic subventions. In the context of global warming and energetic transition, it is of primal importance to optimize the levelized cost of wind energy, in order to make it economically competitive against fossil source of energies and allow wind energy to less rely on economic subventions. The control of wind turbines can strongly contribute to answer this issue.Individual blade Pitch Control (IPC) of wind turbines can allow to modify the aerodynamic properties of the rotor and regulate the unbalanced loads due to skewed wind in the rotor plane. Regulating these unbalanced loads can help in alleviating the fatigue damage of the rotating components of the turbine, such as the blades. On the other hand, IPC is known to induce oscillating loads on the blade pitch actuators and increase their excursions, which induces additional fatigue damage on the blade pitch actuators and blade bearings. Therefore, IPC can have positive effects on the fatigue damage of some components of the turbine, while having negative effects on others. For an efficient optimization of the levelized cost of wind energy, it is necessary that an IPC be optimized, in order to efficiently manage the trade-off between the fatigue damage of various components of a turbine.To address this issue, a fatigue cost function is defined as a weighted sum of wind turbine components fatigue damage, and possibly economic parameters. An IPC regulator must thus be designed in order to minimize this fatigue cost. However, the optimization of fatigue is a challenging task, as the fatigue damage expression does not suit standard forms. It is shown several times in this thesis that standard control strategies are limiting the potential reduction of the fatigue cost expectancy. While combining several standard control strategies designed with different parameters could allow significant reductions of the fatigue cost expectancy, compared to standard IPC control strategies with fixed parameters. The challenge addressed in this thesis is thus to adapt the parameters of standard IPC control strategies, in order to efficiently reduce the fatigue cost expectancy of wind turbines. Two approaches are thus developed in order to address this issue.The first one consists in approximating the fatigue cost function with a fatigue-oriented cost function, thanks to a data-driven identification based on parameterized quadratic forms. This fatigue-oriented cost function used in an optimal control problem allows to efficiently parameterize a standard optimization problem, which approximate the fatigue cost optimization problem around its optimum. Therefore, the fatigue-oriented optimal control problem allows efficient reductions of the fatigue cost expectancy.Model Predictive Control (MPC) is a control strategy which allows to optimize a specified cost function, by solving on-line an optimal control problem. Then, an IPC MPC is derived based on the fatigue-oriented optimal control problem expression. These controllers are thus standard MPCs whose parameters are adapted for fatigue cost reduction. These controllers are then implemented in closed-loop with a simplified wind turbine model and showed great potential in reducing the fatigue cost expectancy, compared to an MPC with fixed parameters.The second approach is a framework where a supervisory layer selects the parameters of candidate controllers based on wind conditions, in order to efficiently minimize the wind turbine fatigue cost expectancy. A proof of concept made with a simple supervisory layer showed that significant reduction of the fatigue cost are already possible, which encourages to also develop this second approach further
Namik, Hazim. "Individual blade pitch and disturbance accommodating control of floating offshore wind turbines." Thesis, University of Auckland, 2012. http://hdl.handle.net/2292/11198.
Full textChen, Hao. "Numerical study of trailing edge flow control for horizontal axis wind turbines." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/13354/.
Full textChen, Zhe. "Advanced wind energy convertors using electronic power conversion." Thesis, Durham University, 1997. http://etheses.dur.ac.uk/1632/.
Full textEdwards, Gregory W. "Wind turbine power generation emulation via doubly fed induction generator control." Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Dec/09Dec%5FEdwards.pdf.
Full textThesis Advisor(s): Julian, Alexander L. Second Reader: Cristi, Roberto. "December 2009." Description based on title screen as viewed on January 28, 2010. Author(s) subject terms: Double Fed Induction Generator (DFIG), Space Vector Modulation (SVM), wind turbine, Field Programmable Gate Array (FPGA), bi-directional power flow. Includes bibliographical references (p. 75). Also available in print.
Burnham, David James. "Control of wind turbine output power via a variable rotor resistance." Thesis, [Austin, Tex. : University of Texas, 2009. http://hdl.handle.net/2152/ETD-UT-2009-05-105.
Full textKjellin, Jon. "Vertical Axis Wind Turbines : Electrical System and Experimental Results." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-182438.
Full textSchlipf, David [Verfasser], and Po Wen [Akademischer Betreuer] Cheng. "Lidar-assisted control concepts for wind turbines / David Schlipf ; Betreuer: Po Wen Cheng." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2016. http://d-nb.info/1118369653/34.
Full textDen, Heijer Francois Malan. "Development of an active pitch control system for wind turbines / F.M. den Heijer." Thesis, North-West University, 2008. http://hdl.handle.net/10394/2635.
Full textThesis (M.Ing. (Mechanical Engineering))--North-West University, Potchefstroom Campus, 2009.
Menon, Ashwin. "Numerical investigation of synthetic jet based flow control for vertical axis wind turbines." Thesis, Rensselaer Polytechnic Institute, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1568426.
Full textThis numerical study focuses on the implementation of active flow control using synthetic jets on vertical-axis wind turbine (VAWT) blades. This study demonstrates that synthetic-jet based flow control improves the efficiency of the turbine and reduces the risk of structural fatigue.
In VAWTs, the blades experience a significant variation in the angle of attack over each rotation cycle and associated with it are sudden changes in the flow-induced loading on the blades. For example, a sudden variation in blade loading is experienced due to the detachment of the leading edge vortex at high angles of attack. This is in-turn reduces the axial force and hence the overall power output of the turbine. Additionally, such force variations lead to structural fatigue and possibly failure. Current simulations consider a cross-section of a three-blade VAWT model (with straight blades). VAWT models with two different airfoils, NACA 0018 and DU 06-W-200, are considered at tip-speed-ratios of 2 and 3. In these simulations, unsteady, Reynolds-averaged Navier-Stokes equations along with the Spalart-Allmaras turbulence model are employed, where stabilized finite element method is utilized along with an implicit time-integration scheme.
The idea of using synthetic jets is to control the variation in flow-induced loading during each rotation cycle. At first the dominant location of the flow separation is determined for both airfoils. The jets are then placed at this location. Jet parameters of blowing ratio and reduced frequency are specified within a range (i.e., O(0.5-1.5) and O(1-10), respectively) and their effects on jet performance are studied. The jets are activated only in a selected portion of the rotation cycle. This is referred to as the partial cycle control in contrast to the full cycle (the latter is found to be detrimental). For given jet parameters, simulations results are used to determine whether the jets improve axial force, flow separation and blade-vortex interaction. At blowing ratio of 1.5 and reduced frequency of 5, we observe above 12% increase in the average axial force over the rotation cycle for both airfoils.
Hoffmann, Rolf. "A comparison of control concepts for wind turbines in terms of energy capture." Phd thesis, [S.l. : s.n.], 2002. https://tuprints.ulb.tu-darmstadt.de/226/1/Diss.pdf.
Full textAlkan, Deniz. "Investigating CVT as a Transmission System Option for Wind Turbines." Thesis, KTH, Energiteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-121187.
Full textAlatar, Faris Muhanned Lutfi. "Frequency Scan–Based Mitigation Approach of Subsynchronous Control Interaction in Type-3 Wind Turbines." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/104657.
Full textMaster of Science
Due to climate change concern and the depletion of fossil fuel resources, electrical power generation is shifting towards renewables such as solar and wind energy. Wind energy can be obtained using wind turbines that transform wind energy into electrical energy, these wind turbines come in four different types. Type-3 wind turbines are the most commonly used in the industry which use a special configuration of the classical induction generator. These wind turbines are typically installed in a distant location which makes it more difficult to transfer energy from its location to populated areas, hence, series capacitors can be used to increase the amount of transferred energy. However, these series capacitors can create a phenomenon called subsynchronous control interaction (SSCI) with Type-3 wind turbines. In this phenomenon, energy is exchanged back and forth between the series capacitors and the wind turbines causing the current to grow exponentially which leads to interruptions in service and damage to major equipments within the wind turbine. This work explores SSCI, the tools to study it, and the currently available mitigation methods. It also presents a method to identify the cases where SSCI can happen and mitigates it using adjustable parameters.
Kumar, Avishek. "Multivariable control of wind turbines for fatigue load reduction in the presence of nonlinearities." Thesis, University of Auckland, 2011. http://hdl.handle.net/2292/17839.
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