Dissertations / Theses: 'Wind Power Turbine'

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Wilmshurst, Stephen Michael Brand. "Wind turbine performance and dynamics." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236111.

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The work described in the dissertation consists of various experimental investigations involving a 5 metre diameter horizontal-axis wind turbine at the Cambridge field test site and a model wind turbine in the low-speed wind tunnel at the Central Electricity Research Laboratories. The first chapter is introductory, summarising previous work by the author's research group and placing the present work in its wider context. The second chapter describes measurements and analysis of the problem of tower shadow for a downwind turbine - the 5m machine - including the use of a streamlined fairing to alleviate the problem. There follow three chapters relating to the broad area of wind turbine performance. The first of these reports how power measurements made in two different ways have been used to define the performance of the 5m machine, giving results in good agreement with theoretical predictions. The next discussed the use of blade-mounted spoilers as a control mechanism and describes experiments which have been carried out with spoilers of a simple design. Chapter 5 concerns the subject of control strategies. Both computer simulation and experimental results are presented for several different operating strategies, with particular attention to the impact on power production. The final chapter describes work carried out in a wind tunnel using a small model turbine. A comprehensive investigation of the model's wake has been undertaken and is analysed with reference to blade loading, ambient turbulence and downstream development.

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Dosset, Pablo. "Urban Wind Power : Installation of an Urban Wind Power turbine in Polhemsskolan in Gävle." Thesis, University of Gävle, Department of Technology and Built Environment, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-760.

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Urban wind power is not too developed yet. Only some years ago some countries started to be aware of the important source of energy that can be used within built-up areas. The U.K., the Netherland, France and Italy are already working on it, but they are still far away to reach models and equations that can be useful for any situation.

An urban turbine is going to be installed in Gävle, Sweden, in the roof of Polhemsskolan. Therefore, the wind velocity should be found out to come up with some results about the energy yield. But some problems appear when try to estimate that velocity.

To calculate this velocity three different ways can be used. They are Mathematical models, Measurements and Simulations or Computational Fluid Dynamic (CFD) calculations. All of them are quite difficult to use. Both mathematical models and CFD are very expensive as well as they need too much time to give a result. In addition, the area where the rotor is going to be installed is quite strange and therefore, it is even more difficult to put all the data in the mathematical model or CFD. On the other hand, measurements were almost impossible to carry on. The measurement of the wind velocity should be done during one year due to the big differences in that value depending on the season; winter, summer... depending on the weather; cloudy, sunny and so on. This thesis was only four months long and that was not enough to do it. It has been tried too to use any measurements that could be in any weather stations in the surrounding of Gävle. Nothing was found. No wind velocity measurements have been made in this area.

Hence, different books and reports about this topic have been study quite depth. Most of them from the U.K. Estimations and assumptions were taking into account to come up with different solutions to make easier in the future to calculate an energy yield when measurements will be done.

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Simmons, Anton Dominic. "A comparison of wind turbine control policies." Thesis, Imperial College London, 1993. http://hdl.handle.net/10044/1/7447.

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Edinger, Chad L. "Wind turbine capacity planning approximations for northwest United States utilities." Online access for everyone, 2008. http://www.dissertations.wsu.edu/Thesis/Spring2008/c_edinger_0032608.pdf.

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Howard, Dustin F. "Short-circuit currents in wind-turbine generator networks." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50361.

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Protection of both the wind plant and the interconnecting transmission system during short-circuit faults is imperative for maintaining system structural integrity and reliability. The circuit breakers and protective relays used to protect the power system during such events are designed based upon calculations of the current that will flow in the circuit during the fault. Sequence-network models of various power-system components, such as synchronous generators, transformers, transmission lines, etc., are often used to perform these calculations. However, there are no such models widely accepted for certain types of wind-turbine generators used in modern wind plants. The problem with developing sequence-network models of wind plants is that several different wind-turbine generator designs exist; yet, each exhibit very different short-circuit behavior. Therefore, a “one size fits all” approach is not appropriate for modeling wind plants, as has been the case for conventional power plants based on synchronous-generator technology. Further, many of the newer wind-turbine designs contain proprietary controls that affect the short-circuit behavior, and wind-turbine manufacturers are often not willing to disclose these controls. Thus, protection engineers do not have a standard or other well-established model for calculating short-circuit currents in power systems with wind plants. Therefore, the research described in this dissertation involves the development of such models for calculating short-circuit currents from wind-turbine generators. The focus of this dissertation is on the four existing wind-turbine generator designs (identified as Types 1 – 4). Only AC-transmission-interconnected wind-turbine generators are considered in this dissertation. The primary objective of this research is the development of sequence-network models, which are frequency-domain analysis tools, for each wind-turbine generator design. The time-domain behavior of each wind-turbine generator is thoroughly analyzed through transient simulations, experimental tests on scaled wind-turbine generator test beds, and solutions to the system dynamic equations. These time-domain analyses are used to support the development of the sequence-network models.

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Beattie, A. "Wind turbine power performance assessment under real conditions." Thesis, Loughborough University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.520497.

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Rawlinson-Smith, R. I. "Computational Study of Stalled Wind Turbine Rotor Performance." Thesis, Cranfield University, 1991. http://dspace.lib.cranfield.ac.uk/handle/1826/4691.

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Simplification of the aerodynamic control of large horizontal axis wind turbines (HAWTs) has been identified as an important step towards improved reliability and reduced cost. At present the majority of large HMrrs use active control to regulate power and loads. A simpler strategy is to use the inherent stalling of the rotor blades in high winds to limit power and loads. Unfortunately the performance of stall regulated HAWTs 1S poorly understood; current performance models often fail to correctly predict peak power levels. The benefits of passive control of power and loads cannot be utilised because of this uncertainty. This study examines the possible reasons for the poor performance of current prediction techniques 1n high winds with the objective of fonmulating a new model. The available experimental evidence suggests that rotor stall is caused by turbulent separation at the rear of the blade aerofoil, growing in extent from the root in increasing wind. This 'picture' of the stalling HAW! rotor forms the basis of the approach. The new model consists of a prescribed vortex wake, first order panel method (extended to represent the viscous region of trailing edge separation) and three dimensional integral boundary layer directly coupled in an iterative scheme. A sensitivity study of rotor indicates that the most important performance to wake geometry factor is the rate at which the wake is convected downstream. However, it is found that stalled power levels are insensitive to wake geometry; the study concludes that the problem of poor prediction of high wind performance lies on the rotor blades. Before using the complete code to calculate the performance of a rotor it 1S first tuned for the aerofoils used on the blade. Aerofoil perfonmance characteristics measured in a wind tunnel are synthesised by the model. Ideally these characteristics should include measured pressure profiles below and above stall. Validation of the complete code against detailed measurements taken under controlled conditions on a three metre diameter machine indicates significant differences in the perfonmance of aerofoil sections on a wind turbine blade when compared to the same section when tested in a wind tunnel. Derived lift coefficients show a reduced lift curve slope and more gentle delayed stall. Similar results are found when the code is applied to two Danish stall regulated machines. These two machines although having very similar geometries and using the same family of aerofoils do however show differences in derived post stall drag. This is thought to be due to the different thickness distributions of the two rotors. The validation and applications of the new model show that it can accurately predict the peak power level of stall regulated machines.

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Johnston, Mark. "Static and modal analysis of wind turbine towers." Thesis, De Montfort University, 1999. http://hdl.handle.net/2086/4184.

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Lloyd, Simon H. "Variable speed control of a small wind turbine." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/14376.

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An electronic controller has been developed for a wind turbine which uses a passive pitching mechanism and a permanent magnet generator. The turbine rotor is a 3 bladed, down wind horizontal axis design with a diameter of 3.4m. The machine, manufactured by Proven Engineering Ltd., produces 2.2kW at a wind speed of 12m/ s and a rotor speed of 30Orpm. Passive regulation is achieved through a variation of blade pitch controlled by balancing the aerodynamic, centrifugal and spring forces acting on each blade. A production machine has been instrumented and laboratory and field test data collected; from this data a mathematical model has been derived. A power electronic interface (DC-DC booster) was designed and built to transform the generator voltage to a fixed DC voltage. A controlled load is used together with feedback to the booster to set an appropriate load resistance according to operating conditions. Current demand from the generator (used in the control) is derived either from the difference between the rotor speed and a reference speed, or directly as a function of the rotor speed (feed-forward control). This thesis deals with the design and testing of the 3 compensators which govern the wind turbine control using both simulated and measured results. The overall objective of the controller is to maximise the energy yield from the wind turbine, subject to realistic constraints imposed by the power electronic design in the context of this particular design.

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Olivieri, David Allen. "Design and testing of a concentrator wind turbine." Thesis, Open University, 1991. http://oro.open.ac.uk/54560/.

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Wind energy, being an indirect form of solar energy would initially seem a very promising form of energy. Unfortunately, it suffers from the problem of dilution. Wind turbine designers naturally try to compensate for this by increasing the size of the rotor to capture more of the kinetic energy of the wind. A major constraint in conventional wind turbine design is the reduction in rotational speed as the size of the rotor is increased. This means expensive gear boxes are unavoidable. The rotor also becomes considerably more complicated in design and heavier as the size increases, to mitigate working stresses. Flow concentrators have been investigated in an attempt to alleviate wind turbine design problems, but flow concentrators usually incur the expense of high structural weight and size. The Helical Vortex Wind Concentrator (HVWC) is a recent addition to the list of flow concentrator types and its economic potential is, as yet unknown. The principle of the HVWC has been demonstrated in a series of wind tunnel tests. The wind tunnel tests involved a direct comparison between the performance of a wind turbine with and without an HVWC attached. During these tests a definite increase in power out was observed when the concentrator was attached to the wind turbine. Previous to these successful wind tunnel tests, other wind tunnel and field tests had been conducted on less successful designs. These other tests were important in the development of the current theory and design or the HVWC. Future research will need to investigate both physical and economic limitations of this type of wind concentrator.

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Scott, Nigel William Jackson. "A flexible blade wind turbine for electricity generation." Thesis, Imperial College London, 1997. http://hdl.handle.net/10044/1/7214.

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Chinchore, Asmita C. "Computational Study of Savonius Wind Turbine." Cleveland State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=csu1389795972.

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13

Lu, Zongtao. "A Study of Nonlinear Control for Power Generation Systems." Case Western Reserve University School of Graduate Studies / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1276910247.

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14

Robotham, Antony John. "The aerodynamic control of the V-type vertical axis wind turbine." n.p, 1989. http://ethos.bl.uk/.

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15

Schmidt, Michael Frank. "Economic optimization of wind turbine design." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19740.

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Elhaji, Emad Mohamed. "IMPACT OF WIND TURBINE ON POWER SYSTEM VOLTAGE STABILITY." OpenSIUC, 2011. https://opensiuc.lib.siu.edu/theses/571.

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This thesis discusses the impact of WTGUs on the IEEE 26-bus power system voltage stability. The effect of WTGUs is studied by increasing the real generated power and real and reactive load power by factor (1+∆λ) where ∆λ is incremental in the loading factor until reaching the voltages on the buses to the point of collapse. The lowest voltage bus in the system is a critical bus that WTGUs will be connected on it. The WTGUs are Farm of wind turbines that are connected to the system. Two types of WTGUs are discussed in this thesis. The first type of WTGU that discus is the fixed speed wind turbine. There are two types of fixed speed wind turbines: pitch angle regulated, and stall regulated. The pitch angle regulated fixed speed wind turbine is focused in this study. The second type of WTGU is the semi-variable speed wind turbine. The models of WTGUs for both types, pitch angle regulated, and semi-variable speed, are used to calculate the reactive power that will be added to the system, but real power is known from manufacture. The real and reactive powers for both WTGUs are dependent on the wind speed, wind turbine characteristic, parameters for induction generator and terminal voltage. One of the most important parts in this thesis is the sensitivity analysis. The main concept of the sensitivity is the slope of the voltage profile at specific loading factor λ. In this part, the study is focused on the affect of increasing the real generated power and real and reactive loaded power on the critical bus.

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Shaheen, Mohammed Mahmoud Zaki Mohammed. "Design and Assessment of Vertical Axis Wind Turbine Farms." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439306478.

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Medici, Davide. "Wind turbine wakes : controland vortex shedding." Licentiate thesis, KTH, Mechanics, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-361.

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Wind tunnel studies of the wake behind a model wind turbine have been made in order to get a better understanding of wake development as well as the possibility to predict the power output from downstream turbines working in the wake of an upstream one. Both two-component hot-wire anemometry as well as particle image velocimetry (PIV) have been used to map the flow field. All three velocity components were measured both for the turbine rotor normal to the oncoming flow as well as with the turbine inclined to the free stream direction (the yaw angle was varied from 0 to 30 degrees). The measurements showed, as expected, a wake rotation in the opposite direction to that of the turbine. A yawed turbine is found to clearly deflect the wake flow to the side showing the potential of controlling the wake position by yawing the turbine. The power output of a yawed turbine was found to vary nearly as the square of the cosine of the yaw angle. The possibility to use active wake control by yawing an upstream turbine was evaluated and was shown to have a potential to increase the power output significantly for certain configurations. An unexpected feature of the flow was that spectra from the time signals showed the appearance of a low frequency fluctuation both in the wake and in the flow outside. This fluctuation was found both with and without free stream turbulence and also with a yawed turbine. The non-dimensional frequency (Strouhal number) was independent of the free-stream velocity and turbulence level but increases with the yaw angle. However the low frequency fluctuations were only observed when the tip speed ratio (or equivalently the drag coefficient) was high. This is in agreement with the idea that the turbine shed structures as a bluff body. It is hypothesized that the observed meandering of wakes in field measurements is due to this shedding.

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Buxamusa, Adnan. "Wind Flow Analysis and Modeling Power Generation for a Multiple Wind Turbine Installation." Youngstown State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1299607231.

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20

Withee, Jon E. "Fully coupled dynamic analysis of a floating wind turbine system." Thesis, Monterey, California. Naval Postgraduate School, 2004. http://hdl.handle.net/10945/1471.

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CIVINS
The use of wind power is in a period of rapid growth worldwide and wind energy systems have emerged as a promising technology for utilizing offshore wind resources for the large scale generation of electricity Drawing upon the maturity of wind turbine and floater technologies developed by the wind energy and oil and gas industries, respectively, large offshore wind energy systems have been developed and are being proposed for operation in offshore areas where environmental restrictions are less restrictive, large wind resources exist, and open sea areas are available for wind farm development. A fully coupled dynamic analysis/technique was developed to predict the response of a floating wind turbine system in a stochastic wind and wave environment This technique incorporated both non-linear wave loading on the submerged floater and the aerodynamic loading on the wind turbine A tension leg spar buoy was designed to support the wind turbine This design was chosen due to its relatively small size and hence lower potential cost per wind turbine The system's tethers were attached to the ends of spokes which radiated out from the spar cylinder This arrangement of lines and spokes promised to be very stiff in the roll and pitch modes of motion.

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21

Pope, Kevin. "Performance assessment of transient behaviour of small wind turbines." Thesis, UOIT, 2009. http://hdl.handle.net/10155/28.

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Small wind turbine installations have a variety of potential uses, each with unique performance demands and operating conditions. Many applications require that the turbine is placed in wind conditions that are not ideal for optimum operation. Better predictive techniques can improve wind turbine performance through improved control strategies and enhanced designs. Conventional methods of wind power design and control utilize an average power coefficient. In this thesis, various techniques to predict the transient power coefficient of a wind turbine are developed. The operation of a Savonius wind turbine is accurately represented, with a new model which considers the flow distributions to predict the changes in power output at all rotor positions. Another model is developed that represents the dynamics of a small horizontal wind turbine, including the effect of transient wind conditions on rotor speed and acceleration. These can supplement current methods to determine turbine placement, selection and categorization.

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Catto, Gavin. "Direct coupled permanent magnet synchronous generators for wind turbine application." Thesis, University of Manchester, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262119.

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Lack, L. W. "The design of wind turbine rotors in relation to fatigue." Thesis, University of Reading, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371440.

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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.

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KAUTS, MAREK-ANDRES. "Competitive Strategy for Entering Wind Turbine Manufacturing Industry." Thesis, KTH, Entreprenörskap och Innovation, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-189275.

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The purpose of this thesis is to explore, how it is best to enter to the wind turbine manufacturingindustry and suggest a competitive strategy for that purpose.The thesis follows Michael E. Porter's Competitive Strategy framework. The market is analyzed using data and scenarios from World Energy Council, Global Wind Energy Council and European Wind Energy Association. As competitors, European-based wind turbine manufacturers belonging by their market share to Global Top 10 are analyzed. A five-point competitive strategy is drafted.Technological innovations and business model improvements are not analyzed in this thesis.The result of competitive strategy research performed in this thesis is, that a window to enter to wind turbine manufacturing industry is embedded into the process of establishing a new experience curve. The new experience curve is based on direct drive wind turbine concept. The thesis suggests that the market to enter the industry is European onshore wind turbine market.A major barrier entering the industry is well established relationships between old wind turbine manufacturers and customers whereas the newcomers lack of sufficient references. A strategy to hurdle the barrier is acquiring the references by forward integration. Therefore, to enter to the market, wind turbine company should own its own wind park as a base of references and new product testing. As wind parks product, electricity is a commodity and sold on a commodities market, the forward integration does not need major extra know how.Core competences for the emerging company include product engineering and quality management.

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Mewburn-Crook, Anthony. "The design and development of an augmented vertical axis wind turbine." Thesis, Kingston University, 1990. http://eprints.kingston.ac.uk/20541/.

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The augmented vertical axis wind turbine resulted from a survey of the problems of existing wind turbines, and the identification of the design criteria that it should be inherently safe and reliable. It should be self-starting in low winds and continue to run in high Winds, and it should be environmentally acceptable. The design consisted of a vertical axis rotor, with five vertical and five horizontal blades, surrounded by an augmentor which contained eight converging stators and a dome desigried to increase the flow rate through the rotor, and to decrease the pressure at exit from the rotor. Extensive model tests showed that the wind turbine had attractive operating characteristics, which were confirmed by a prototype machine with a 6m diameter rotor rated at 10kW. However, a detailed analysis of the design and costs showed that it was too expensive. An analysis of an idealised augmented vertical axis wind turbine showed that there was potential for increasing the performance and decreasing costs. Measurements of the detailed flow field through the rotor and around the augmentor demonstrated that augmentation was by means of an increased pressure drop across the rotor, combined with an increased mass flow rate through it. The efficiency of the upstream part of the rotor was also increased by the augmentor. The benefits of turbulent mixing in the wake of the turbine between the external flowfield and the flow through the turbine were also recognised. Major modifications to the design of the augmentor and rotor resulted in two types of wind turbine which maintained the attractive operating characteristics and appeared to be commercially viable. The designs offer particular benefits in terms of inherent safety and reliability. The potential of cost effective, large multi¬megawatt machines is also recognised. The work has also provided further insight into wind turbine augmentation, and in the design and development of vertical axis rotors.

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Medici, Davide. "Experimental studies of wind turbine wakes : power optimisation and meandering." Doctoral thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-598.

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Van, Wyngaardt Quintin. "Optimisation of wind turbine electrical power conversion / van Wyngaardt Q." Thesis, North-West University, 2011. http://hdl.handle.net/10394/8215.

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With South Africa being one of the major contributors of greenhouse gases in the world due the large number of coal burning power stations, and Eskom the local electrical power utility enforcing “loadshedding” to cope with the current demand in electrical energy, it is apparent that there is a need to do research on an off–grid home powered by a renewable energy source. The renewable energy source selected for this dissertation is wind energy. The main goal is to determine if it is viable for an off–grid home to be powered by only using wind energy. Wind energy is a well established source of renewable energy in countries like Denmark and Germany. An energy usage analysis is done on a home with no energy efficient strategy. The energy wasting appliances are identified and replaced with energy efficient appliances to reduce the energy usage of the home. This indirectly reduces the size and cost of the wind generator system (WGS) required to supply the house with electrical energy. The various components of an off–grid WGS are identified and researched in terms of available technologies, efficiency and maintenance requirements. The WGS is pulled apart to view each component separately. This helps to identify the areas where the WGS can be optimised in terms of energy conversion efficiency. A WGS is assembled according to a theoretical specification (based on real life parameters) of an off–grid home with no energy efficiency strategy in place. The home is made energy efficient by identifying and replacing the energy wasting appliances with energy efficient appliances. The components of the off–grid WGS are sized and selected based on their performance characteristics. The cost of the WGS is calculated for a period of 20 years. The cost of the WGS is compared to the cost of supplying the home with electrical energy from a fuel generator for the same period. The cost is also compared to supplying the home with electrical energy from the utility for the same period.
Thesis (M.Ing. (Computer and Electronic Engineering))--North-West University, Potchefstroom Campus, 2012.

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Masukume, Peace-Maker. "Electrical power output estimation model for a conical diffuser augmented wind turbine." Thesis, University of Fort Hare, 2016. http://hdl.handle.net/10353/1517.

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Energy is integral to the quality of life of any society. However, meeting the demand for energy sustainably is the main challenge facing humanity. In general, non-renewable energy resources are used to supply the ever increasing energy demand. However, the extraction and processing of these resources is accompanied by the production of wastes which are a health hazard and impact negatively on climate change. Considering the finite nature of non-renewable sources, the environmental concerns which are associated with their usage and ensuring energy security, renewable energy sources have been brought in the energy supply chain. Wind energy is one of the renewable energy sources which has been supplying electrical energy to the ever increasing energy demand of humanity. Wind energy technology is a mature technology which over and above the bare (conventional) wind turbine technology has seen the development of duct augmented wind turbines. Ducts are used to encase wind turbine rotors to augment the power output of wind turbines especially in low wind speed areas. Though the technology has been under study for decades now, research indicates that there is no known model to estimate the power output of a diffuser augmented wind turbine. This thesis presents the development of the conical Diffuser Augmented Wind Turbine (DAWT) power output estimation model and its validation.

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Hedlund, Richard, and Niklas Timarson. "Intelligent Wind Turbine Using Fuzzy PID Control." Thesis, KTH, Mekatronik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-218276.

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This thesis demonstrates how small wind turbines can contributeto a greener planet by using wind energy to generateelectrical power. It compares the conventional PIDcontroller with the Fuzzy PID controller, implemented ina small wind turbine that was constructed using variousmachines. The concept of changing the gain parameters of the PIDcontroller with fuzzy logic, depending on the wind directionfor greater power generation, is explained and tested. This,with usage of a DC-motor that gets an output signal fromthe system which reads input values from an encoder anda wind vane. The construction included a powertrain inwhich a transmission, roller bearings and shafts were implementedin the yaw mechanism. The tests resulted in showing that the Fuzzy PID controllerperformed better, minimizing the error, when theerror between the wind turbine and the wind itself, wassmall. The power generation was also increased when utilizingthe Fuzzy PID controller. However, the PID controllerperformed similar to the Fuzzy PID controller whenexposed to larger errors.
Det här arbetet visar hur små vindkraftverk kan bidra tillen grönare planet genom att omvandla vindenergi till elektriskenergi. Det beskriver jämförelsen mellan den vanligtförekommande PID regulatorn och den suddiga PID regulatorn,implementerad i ett litet vindkraftverk som konstruerades med hjälp av flertalet maskiner. Konceptet att ändra på parametrarna i PID regulatorn med hjälp av suddig logik, beroende på vindriktningen, förklaras och testas med syfte att generera energi. Dettamed hjälp av en DC-motor som får utsignaler från systemet som läser insignaler från en encoder och en vindflöjt. Konstruktionen av rotatonsmekanismen innehöll implementation av en växel, kullager och axlar. Testresultaten visade att den suddiga PID regleringenvar bättre på att minimera felet, när felet mellan vindkraftverket och vinden var litet. Även vid generering av energi,visade det sig att den suddiga PID regleringen presterade bättre. Likväl presterade PID regulatorn på samma nivå som den suddiga, när felet var större.

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Kishore, Ravi Anant. "Small-scale Wind Energy Portable Turbine (SWEPT)." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23099.

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Large Scale Wind Turbines (LSWTs) have been extensively examined for decades but very few studies have been conducted on the small scale wind turbines (SSWTs) especially for the applications near ground level where wind speed is of order of few meters per second. This study provides the first systematic effort towards design and development of SSWTs (rotor diameter<50 cm) targeted to operate at low wind speeds (<5 m/s). An inverse design and optimization tool based on Blade Element Momentum theory is proposed. The utility and efficacy of the tool was validated by demonstrating a 40 cm diameter small-scale wind energy portable turbine (SWEPT) operating in very low wind speed range of 1 m/s-5 m/s with extremely high power coefficient. In comparison to the published literature, SWEPT is one of the most efficient wind turbines at the small scale and very low wind speeds with the power coefficient of 32% and overall efficiency of 21% at its rated wind speed of 4.0 m/s. It has very low cut-in speed of 1.7 m/s. Wind tunnel experiments revealed that SWEPT has rated power output of 1 W at 4.0 m/s, and it is capable of producing power output up to 9.3 W at wind speed of 10 m/s. The study was further extended to develop a piezoelectric wind turbine which operates below 2.0 m/s wind speed. The piezoelectric wind turbine of overall dimension of 100mm x 78mm x 65mm is capable of producing peak electric power of about 450 microwatt at the rated wind speed of 1.9 m/s.
Master of Science

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32

Zhao, Dongbo. "Reliability modeling and analysis of wind turbine systems and wind farms in bulk power systems." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53956.

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This dissertation addresses the modeling of wind turbine systems (WTS) and wind farms. The WTS reliability model provides the generation state space of a WTS. The generation states are derived from the combinations of the wind states from given wind data and the condition states of each component in a WTS. Wake effect is accounted when there are neighboring WTSs. The results of the reliability model of a WTS are associated with the generation states of the WTS, which include the probability, transition rates to other states, frequency of transitions to other states, and duration. The reliability model of the wind farm is derived by combining the wind states, WTS states and the distribution line states. The results of the reliability model of a wind farm are associated with the generation states of the wind farm, which include the probability, transition rates to other states, frequency to other states, and duration. The reliability model of the wind turbine system and the reliability model of the wind farm presented in this dissertation bring contribution to the planning and operation of bulk power systems with wind farm integration. The developed models can provide the system operator with clear reliability indices in terms of generation states of wind turbine systems and wind farms along with their probability, duration and frequency of transitions.

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Abu-hamdeh, Muthanna S. "Modeling of Bi-directional Converter for Wind Power Generation." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1259684130.

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White, Stephen Kenneth. "A state of the art Cretan water pumping wind turbine using electrical transmission." Thesis, Imperial College London, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261998.

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Hand, M. Maureen. "Variable-speed wind turbine controller systematic design methodology : a comparison of non-linear and linear model-based designs /." Golden, CO : National Renewable Energy Laboratory, 1999. http://www.nrel.gov/docs/fy99osti/25540.pdf.

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DeLucia, Dominic. "A Parametric Study on Power Variation for Model Wind Turbine Arrays." PDXScholar, 2013. http://pdxscholar.library.pdx.edu/open_access_etds/1120.

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This thesis presents the results of wind tunnel experiments performed for various model wind turbine arrays. The aim is to understand how siting affects power output. To optimize wind farm efficiency the experiments vary the parameters of the model wind turbines and the layout of the wind turbine array. The parameters include the alignment, height, spacing, and the rotational direction of the model wind turbines. These experiments employ mechanical torque sensors to simultaneously measure the torque and rotor angular velocity, which yields a direct measurement of the fluid mechanical power extracted by the turbine at multiple locations. For a 4 × 3 array, the power is calculated at the center turbine in each of the rows. Variations in wind farm efficiency ranging from 55% to 90% are observed between the 13 different layouts tested. Modifications to the layout of the wind turbine array clearly affects the power output of the wind turbines downstream. The results of such experiments highlight the importance of studying the relationship between wind farm layout and power output.

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Simoes, Francisco Jose. "A steady inviscid flow model for horizontal axis wind turbine rotors under high loading." Thesis, Imperial College London, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261843.

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Smith, Donald. "An experimental and theoretical investigation of wind turbine wakes in arrays and complex terrain." Thesis, Open University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293746.

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Milani, Neil Patrick. "PERFORMANCE OPTIMIZATION OF A HYBRID WIND TURBINE-DIESEL MICROGRID POWER SYSTEM." NCSU, 2006. http://www.lib.ncsu.edu/theses/available/etd-11062006-173005/.

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Nearly all off-grid, remote cold-weather facilities utilize diesel-only systems for both thermal and electrical power generation. In areas of minimal to moderate wind resources, these facilities could substantially decrease diesel fuel usage and could additionally provide for thermal energy production via the integration of a wind turbine system combined with resistance heating into the facility. Voltage and frequency grid stabilization could be obtained by using the diesel electrical generating unit as a synchronous condenser and by using incremental resistive load control, respectively. For systems following medium to high wind penetration guidelines, control components are required but no energy storage mechanisms are needed. This thesis investigates a High-Penetration, No Storage Wind Diesel (HPNSWD) system that can utilize available wind resources to minimize diesel fuel costs for the Scott Base facility ? all without implementing expensive and maintenance-intensive energy storage devices.

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Parker, Max. "Power Conversation for a Modular Lightweight Direct-Drive Wind Turbine Generator." Thesis, University of Newcastle Upon Tyne, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.506424.

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Carlberg, Marcus. "Quantify Change in Wind Turbine Power Performance Using Only SCADA Data." Thesis, KTH, Kraft- och värmeteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-177878.

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The power performance characteristic of a wind turbine is defined by its power curve and resulting estimate in annual energy production. It is a key attribute for validating the performance of newly installed wind turbines, and the power curve is monitored throughout the wind turbine life cycle. This report explains power performance, upgrading, and conventional measurement methods. Wind farm stakeholders are keen on understanding the power performance of their wind turbines. The manufacturers’ monitoring software allows the power curve to be tracked in real time. Deviations from normal operation and underperformance can quickly be identified. However, these power curves cannot be trusted for evaluating upgrades and particular changes made to the wind turbine. The power curve is highly sensitive to small deviations in wind speed output of the nacelle anemometer. Upgrades which impact the air flow at the nacelle will introduce significant wind speed bias in such power curves. Thus owners are lacking appropriate tools for evaluating past events’ impact on power performance. The focus of this work lies on testing an alternative approach to measuring change in power performance using only historical wind turbine log data. Side-by-Side Testing as explained by Axel Albers was tested on real wind turbine data. This method uses no wind measurements, but instead simulates the wind speed using a deducted power relation to a neighbouring wind turbine and an assumed power curve behaviour. This allows any change in power output to be tracked onto the power curve, relying only on power output measurements. A full power performance analysis was performed by constructing Side-by-Side Testing in Microsoft Excel exclusively for this MSc thesis work. It was applied on a wind farm whose recent blade upgrade had never before been analysed. Two neighbouring identical 2.3 MW wind turbines were considered for the analysis, one which in May 2013 installed blade add-ons featuring serrated trailing edges to the blades. The analysis was executed completely off site. The power performance analysis was completed, producing meaningful results with known uncertainty levels. The test results indicate an improvement of power performance throughout the power curve, corresponding to an increase of 0.53% in annual energy production, at ±1.35% uncertainty. The analysis needs further work and validation, as the power curve shows signs of artefacts. The complex wind farm settings increase the uncertainty levels. The method could likely be tested in flat terrain or offshore with lower uncertainty of results, targeting below ±0.5% uncertainty in annual energy production.

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Ayotte, John. "Dynamic positioning of a semi-submersible, multi-turbine wind power platform." Thesis, Uppsala universitet, Avdelningen för systemteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-244728.

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As a growing market for offshore wind power has created a niche for deep-water installations, offshore floating wind solutions have become more and more viable as a renewable energy source. This technology is currently in development and as with many new technologies, many traditional design methods are found lacking. In the multi-turbine platform design investigated, turbine units are placed closely together to conserve material use and reduce cost, however with such tightly spaced turbines; wake interaction poses a threat to the productivity and the lifespan of the installation. In order to fully capitalize on the substantial increase in available wind energy far at sea, it is important that these floating parks operate in an optimal way. The platform investigated in this report sports 3, 6MW turbines which must be positioned such that wake interference is minimized; the platform must always bear a windward heading. Maneuvering ocean going vessels has been practiced using automated dynamic positioning systems in the gas and oil industry for over 50 years, often employing submerged thrusters as a source of propulsion. These systems are mostly diesel powered and require extra operational maintenance, which would otherwise increase the cost and complexity of a floating wind farm. In this paper, it is suggested that the wind turbines themselves may be used to provide the thrust needed to correct the platform heading, thus eliminating the practical need for submerged thrusters. By controlling the blade pitch of the wind turbines, a turning moment (torque) can be exerted on the platform to correct heading (yaw) relative wind direction. Using the Hexicon H3-18MW platform as a starting point; hydrodynamic, aerodynamic and electromechanical properties of the system are explored, modeled and attempts at model predictive control are made. Preliminary results show that it is possible to control the H3’s position (in yaw) relative the wind using this novel method.

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Edwards, 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.

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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, December 2009.
Thesis 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.

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Smith, Christopher John. "Holistic physics-of-failure approach to wind turbine power converter reliability." Thesis, Durham University, 2018. http://etheses.dur.ac.uk/12567/.

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As the cost of wind energy becomes of increasing importance to the global surge of clean and green energy sources, the reliability-critical power converter is a target for vast improvements in availability through dedicated research. To this end, this thesis concentrates on providing a new holistic approach to converter reliability research to facilitate reliability increasing, cost reducing innovations unique to the wind industry. This holistic approach combines both computational and physical experimentation to provide a test bench for detailed reliability analysis of the converter power modules under the unique operating conditions of the wind turbine. The computational models include a detailed permanent magnet synchronous generator wind turbine with a power loss and thermal model representing the machine side converter power module response to varying wind turbine conditions. The supporting experimental test rig consists of an inexpensive, precise and extremely fast temperature measurement approach using a PbSe photoconductive infra-red sensor unique in the wind turbine reliability literature. This is used to measure spot temperatures on a modified power module to determine the junction temperature swings experienced during current cycling. A number of key conclusions have been made from this holistic approach. -Physics-of-failure analysis (and indeed any wind turbine power converter based reliability analysis) requires realistic wind speed data as the temporal changes in wind speed have a significant impact on the thermal loading on the devices. -The use of drive train modelling showed that the current throughput of the power converter is decoupled from the incoming wind speed due to drive train dynamics and control. Therefore, the power converter loading cannot be directly derived from the wind speed input without this modelling. -The minimum wind speed data frequency required for sufficiently accurate temperature profiles was determined, and the use of SCADA data for physics-of failure reliability studies was subsequently shown to be entirely inadequate. -The experimental emulation of the power converter validated a number of the aspects of the simulation work including the increase in temperature with wind speed and the detectability of temperature variations due to the current's fundamental frequency. Most importantly, this holistic approach provides an ideal test bench for optimising power converter designs for wind turbine, or for other industries with stochastic loading, conditions whilst maintaining or exceeding present reliability levels to reduce wind turbine's cost of energy, and therefore, society.

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Werngren, Simon. "Comparison of different machine learning models for wind turbine power predictions." Thesis, Uppsala universitet, Avdelningen för systemteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-362332.

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The goal of this project is to compare different machine learning algorithms ability to predict wind power output 48 hours in advance from earlier power data and meteorological wind speed predictions. Three different models were tested, two autoregressive integrated moving average (ARIMA) models one with exogenous regressors one without and one simple LSTM neural net model. It was found that the ARIMA model with exogenous regressors was the most accurate while also beingrelatively easy to interpret and at 1h 45min 32s had a comparatively short training time. The LSTM was less accurate, harder to interpretand took 14h 3min 5s to train. However the LSTM only took 32.7s to create predictions once the model was trained compared to the 33min13.7s it took for the ARIMA model with exogenous regressors to deploy.Because of this fast deployment time the LSTM might be preferable in certain situations. The ARIMA model without exogenous regressors was significantly less accurate than the other two without significantly improving on the other ARIMA model in any way

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Wo, Chung. "PERFORMANCE ASSESSMENT OF THE CASE WESTERN RESERVE UNIVERSITYWIND TURBINE AND CHARACTERIZATION OF WIND AVAILABILITY." Case Western Reserve University School of Graduate Studies / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=case1383338732.

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Ahlström, Anders. "Simulating Dynamical Behaviour of Wind Power Structures." Licentiate thesis, KTH, Mechanics, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1479.

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The workin this thesis deals with the development of anaeroelastic simulation tool for horizontal axis wind turbineapplications.

Horizontal axiswind turbines can experience significanttime varying aerodynamic loads, potentially causing adverseeffects on structures, mechanical components, and powerproduction. The need of computational and experimentalprocedures for investigating aeroelastic stability and dynamicresponse have increased as wind turbines become lighter andmore flexible.

A finite element model for simulation of the dynamicresponse of horizontal axis wind turbines has been developed.The simulations are performed using the commercial finiteelement software SOLVIA, which is a program developed forgeneral analyses, linear as well as non-linear, static as wellas dynamic. The aerodynamic model, used to transform the windflow field to loads on the blades, is a Blade- Element/Momentummodel. The aerodynamic code is developed by FFA (TheAeronautical Research Institute of Sweden) and is astate-of-the-art code incorporating a number of extensions tothe Blade-Element/Momentum formulation. SOSIS-W, developed byTeknikgruppen AB was used to develop wind time series formodelling different wind conditions.

The model is rather general, and different configurations ofthe structural model and various type of wind conditions couldeasily be simulated. The model is primarily intended for use asa research tool when influences of specific dynamic effects areinvestigated.

Simulation results for the three-bladed wind turbine Danwin180 kW are presented as a verification example.

Keywords:aeroelastic modelling, rotor aerodynamics,structural dynamics, wind turbine, AERFORCE, SOSIS-W,SOLVIA

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Sexon, B. A. "Theoretical and experimental analysis of a wind turbine / battery system for use in isolated locations." Thesis, University of Reading, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356065.

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Braña, Isaac. "Turbine-Mounted Lidar:The pulsed lidar as a reliable alternative." Thesis, Högskolan på Gotland, Institutionen för kultur, energi och miljö, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-217020.

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Expectations for turbine-mounted lidar are increasing. The installation of lidars in wind turbine nacelles for measuring incoming winds, preventing wind gusts and increasing energy productions is after recently studies, technically and economically feasible. Among available lidar types, the most studied were continuous wave lidars because they were the most reliable apparatus when this initiative began. However, after studying technical considerations and checking commercial lidars, it was found that pulsed lidarslead this technology due to their promising results. The purpose of this report is to fill the gap between the interest in this technology and the absence of any academic papers that analyzes continuous-wave and pulsed lidars forthe mounted lidar concept. Hence, this report discusses the importance of turbine mounted lidars for wind power industry, different possible configurations and explains why specifically pulsed lidars are becoming more important for the mounted lidarmarket.

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Melius, Matthew Scott. "Identification of Markov Processes within a Wind Turbine Array Boundary Layer." PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/1422.

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The Markovianity within a wind turbine array boundary layer is explored for data taken in a wind tunnel containing a model wind turbine array. A stochastic analysis of the data is carried out using Markov chain theory. The data were obtained via hot-wire anemometry thus providing point velocity statistics. The theory of Markovian processes is applied to obtain a statistical description of longitudinal velocity increments inside the turbine wake using conditional probability density functions. It is found that two and three point conditional probability density functions are similar for scale differences larger than the Taylor micro-scale. This result is quantified by use of the Wilcoxon rank-sum test which verifies that this relationship holds independent of initial scale selection outside of the near-wake region behind a wind turbine. Furthermore, at the locations which demonstrate Markovian properties there is a well defined inertial sub-range which follows Kolmogorv's -5/3 scaling behavior. Results indicate an existence of Markovian properties at scales on the order of the Taylor micro-scale, λ for most locations in the wake. The exception being directly behind the tips of the rotor and the hub where the complex turbulent interactions characteristic of the near-wake demonstrate influence upon the Markov process. The presence of a Markov process in the remaining locations leads to characterization of the multi-point statistics of the wind turbine wakes using the most recent states of the flow.

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Dissertations / Theses on the topic 'Wind Power Turbine'

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