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Thèses sur le sujet « Wind power vertical flow »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 7 février 2022

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1

Österberg, David. "Multi-Body Unsteady Aerodynamics in 2D Applied to aVertical-Axis Wind Turbine Using a Vortex Method." Thesis, Uppsala universitet, Elektricitetslära, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-131932.

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Vertical axis wind turbines (VAWT) have many advantages over traditional Horizontalaxis wind turbines (HAWT).One of the more severe problem of VAWTs are the complicated aerodynamicbehavior inherent in the concept. Incontrast to HAWTs the blades experience varying angle of attack during its orbitalmotion. The unsteady flowleads to unsteady loads, and hence, to increased risk for problems with fatigue.A tool for aerodynamic analysis of vertical axis wind turbines has been developed.The model, a Discrete vortex method, relies on conformal maps to simplify the taskto finding the flowaround cylinde

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2

Goude, Anders. "Fluid Mechanics of Vertical Axis Turbines : Simulations and Model Development." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-183794.

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Two computationally fast fluid mechanical models for vertical axis turbines are the streamtube and the vortex model. The streamtube model is the fastest, allowing three-dimensional modeling of the turbine, but lacks a proper time-dependent description of the flow through the turbine. The vortex model used is two-dimensional, but gives a more complete time-dependent description of the flow. Effects of a velocity profile and the inclusion of struts have been investigated with the streamtube model. Simulations with an inhomogeneous velocity profile predict that the power coefficient of a vertical

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3

Waltham, M. R. "Sailwing vertical axis wind turbines." Thesis, University of Reading, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316334.

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4

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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5

D'Ambrosio, Marco, and Marco Medaglia. "Vertical Axis Wind Turbines: History, Technology and Applications." Thesis, Halmstad University, Halmstad University, School of Business and Engineering (SET), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-4986.

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<p>In this Master Thesis a review of different type of vertical axis wind turbines (VAWT) and a preliminary investigation of a new kind of VAWT are presented.</p><p>After an introduction about the historical background of wind power, the report deals with a more accurate analysis of the main type of VAWT, showing their characteristics and their operations. The aerodynamics of the wind turbines and a review of different type on generators that can be used to connect the wind mill to the electricity grid are reported as well.</p><p>Several statistics are also presented, in order to

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6

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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7

Bülow, Fredrik. "A Generator Perspective on Vertical Axis Wind Turbines." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-197855.

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The wind energy conversion system considered in this thesis is based on a vertical axis wind turbine with a cable wound direct drive PM generator. Diode rectifiers are used to connect several such units to a single DC-bus and a single inverter controls the power flow from the DC-bus to a utility grid. This work considers the described system from a generator perspective i.e. the turbine is primarily seen as a torque and the inverter is seen as a controlled load. A 12 kW VAWT prototype with a single turbine has been constructed within the project. The power coefficient of this turbine has been

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8

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

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9

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.

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Wind power is an established mean of clean energy production and the modern horizontal axis wind turbine has become a common sight. The need for maintenance is high and future wind turbines may need to be improved to enable more remote and offshore locations. Vertical axis wind turbines have possible benefits, such as higher reliability, less noise and lower centre of gravity. This thesis focuses on electromechanical interaction in the straight bladed Darrieus rotor (H-rotor) concept studied at Uppsala University. One of the challenges with vertical axis technology is the oscillating aerodynam

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10

Möllerström, Erik. "Vertical Axis Wind Turbines : Tower Dynamics and Noise." Licentiate thesis, Högskolan i Halmstad, Energiteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-242267.

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Vertical axis wind turbines (VAWTs) have with time been outrivaled by the today common and economically feasible horizontal axis wind turbines (HAWTs). However, VAWTs have several advantages such as the possibility to put the drive train at ground level, lower noise emissions and better scaling behavior which still make them interesting for research. The work within this thesis is made in collaboration between the Department of Construction and Energy Engineering at Halmstad University and the Division for Electricity at Uppsala University. A 200 kW VAWT owned by the latter and situated close

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11

Wong, Ka Chun. "Wind power in Hong Kong : with special reference to wind flow over complex terrain /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202005%20WONGK.

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12

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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13

Eriksson, Sandra. "Direct Driven Generators for Vertical Axis Wind Turbines." Doctoral thesis, Uppsala : Acta Universitatis Uppsaliensis, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9210.

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14

Kane, Laura. "An assessment of power system principles of access for wind power using optimal power flow." Thesis, University of Strathclyde, 2015. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=24925.

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The growth of renewable generation (and wind generation in particular) in distribution networks is leading to the development of Active Network Management (ANM) strategies and solutions. ANM systems aim to increase the capacity of renewable and distributed generation that can connect to power networks. One such ANM strategy is generation curtailment where distributed generation is given a non-firm connection under which the network operator instructs the generator to reduce its power output under specified conditions and this is practically achieved through the implementation of automatic cont

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15

Cevik, Fatih. "Design Of An Axial Flow Fan For A Vertical Wind Tunnel For Paratroopers." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612790/index.pdf.

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Free fall is one of the important phases of the operation performed by the Special Forces paratroopers. Also civilian parachutists are performing free fall as a sport by doing aerobatic maneuvers when they reach the terminal velocity during falling before opening their parachutes. Vertical wind tunnels are used for training the parachutists and paratroopers. It is safe, cheap and more convenient when compared to jumping out of an airplane. This thesis consists of aerodynamic design of closed circuit, double return vertical wind tunnel with a flight section that can accommodate four paratrooper

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16

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.

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<p> This 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. </p><p> 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 vorte

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17

Kjellin, 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.

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The wind power research at the division of Electricity at Uppsala University is aimed towards increased understanding of vertical axis wind turbines. The considered type of wind turbine is an H-rotor with a directly driven synchronous generator operating at variable speed. The experimental work presented in this thesis comprises investigation of three vertical axis wind turbines of different design and size. The electrical, control and measurement systems for the first 12 kW wind turbine have been designed and implemented. The second was a 10 kW wind turbine adapted to a telecom application. B

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18

Angell, Roger Kenneth. "An experimental investigation into the dynamic suitability of thick section aerofoils for the blades of large scale vertical axis wind turbines." Thesis, University of Reading, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241532.

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19

Liang, Jiaqi. "Wind energy and power system interconnection, control, and operation for high penetration of wind power." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/47570.

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High penetration of wind energy requires innovations in different areas of power engineering. Methods for improving wind energy and power system interconnection, control, and operation are proposed in this dissertation. A feed-forward transient compensation control scheme is proposed to enhance the low-voltage ride-through capability of wind turbines equipped with doubly fed induction generators. Stator-voltage transient compensation terms are introduced to suppress rotor-current overshoots and torque ripples during grid faults. A dynamic stochastic optimal power flow control scheme is propose

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20

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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21

Banham-Hall, Dominic. "Active power control response from large offshore wind farms." Thesis, Brunel University, 2012. http://bura.brunel.ac.uk/handle/2438/11051.

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The GB power system will see huge growth in transmission connected wind farms over the next decade, driven by European clean energy targets. The majority of the UK’s wind development is likely to be offshore and many of these wind farms will be interfaced to the grid through power converters. This will lead to a loss of intrinsic inertia and an increasing challenge for the system operator to keep grid frequency stable. Given this challenge, there is increasing interest in understanding the capabilities of converter control systems to provide a synthesised response to grid transients. It is int

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22

Hikkaduwa, Vithanage Ajith. "DESIGN AND PERFORMANCE ANALYSIS OF PITCHED-PLATE VERTICAL AXIS WIND TURBINE FOR DOMESTIC POWER GENERATION." Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-17428.

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Wind energy is identified a promising energy resource in Sri Lanka. Therefore, it is important to use proper technologies for efficient energy capturing in order to minimize cost of energy. Small scale wind turbines are usually installed in constricted places (particularly in urban areas) where wind flow is turbulent and difficult to predict. Savonious type vertical axis wind turbines are important due to several reasons such as good response to turbulent winds, high initial torque, low cost, low noise, less maintenance.In this study, a modified flat plate type Savonius wind rotor was proposed

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23

Abuella, Mohamed A. "STUDY OF PARTICLE SWARM FOR OPTIMAL POWER FLOW IN IEEE BENCHMARK SYSTEMS INCLUDING WIND POWER GENERATORS." OpenSIUC, 2012. https://opensiuc.lib.siu.edu/theses/991.

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AN ABSTRACT OF THE THESIS OF Mohamed A. Abuella, for the Master of Science degree in Electrical and Computer Engineering, presented on May 10, 2012, at Southern Illinois University Carbondale. TITLE:STUDY OF PARTICLE SWARM FOR OPTIMAL POWER FLOW IN IEEE BENCHMARK SYSTEMS INCLUDING WIND POWER GENERATORS MAJOR PROFESSOR: Dr. C. Hatziadoniu, The aim of this thesis is the optimal economic dispatch of real power in systems that include wind power. The economic dispatch of wind power units is quite different of conventional thermal units. In addition, the consideration should take the intermittency

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24

Sánchez, Morales Valentin. "Experimental and CFD analysis of the flow in the wake of a vertical axis wind turbine." Doctoral thesis, Universitat Rovira i Virgili, 2017. http://hdl.handle.net/10803/454742.

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Aquesta tesi es divideix en dos blocs on s'analitza el flux d'una VAWT. El primer bloc se centra en l'estudi experimental i numèric d'una VAWT amb vuit pales basada en el fenomen de resistència. A la primera part, la velocitat del vent es fixa en 10 m/s per mesurar la corba de potència de la turbina i els resultats es comparen amb els d'altres turbines Savonius en diferents túnels de vent. També s'ha analitzat la reducció del nombre de pales i s'ha comprovat que el rendiment augmenta. A la segona part, la velocitat del vent s'estableix en 4,5 m/s per a realitzar experiments de visualització

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25

Dyachuk, Eduard. "Aerodynamics of Vertical Axis Wind Turbines : Development of Simulation Tools and Experiments." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-260573.

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This thesis combines measurements with the development of simulation tools for vertical axis wind turbines (VAWT). Numerical models of aerodynamic blade forces are developed and validated against experiments. The studies were made on VAWTs which were operated at open sites. Significant progress within the modeling of aerodynamics of VAWTs has been achieved by the development of new simulation tools and by conducting experimental studies. An existing dynamic stall model was investigated and further modified for the conditions of the VAWT operation. This model was coupled with a streamtu

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26

Hamon, Camille. "Probabilistic security management for power system operations with large amounts of wind power." Doctoral thesis, KTH, Elektriska energisystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-166398.

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Power systems are critical infrastructures for the society. They are therefore planned and operated to provide a reliable eletricity delivery. The set of tools and methods to do so are gathered under security management and are designed to ensure that all operating constraints are fulfilled at all times. During the past decade, raising awareness about issues such as climate change, depletion of fossil fuels and energy security has triggered large investments in wind power. The limited predictability of wind power, in the form of forecast errors, pose a number of challenges for integrating wind

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Möllerström, Erik. "Noise, eigenfrequencies and turbulence behavior of a 200 kW H-rotor vertical axis wind turbine." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-316385.

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Vertical-axis wind turbines (VAWTs) have with time been outrivaled by the today more common and economically feasible horizontal-axis wind turbines (HAWTs). However, VAWTs have several advantages which still make them interesting, for example, the VAWTs can have the drive train at ground level and it has been argued that they have lower noise emission. Other proposed advantages are suitability for both up-scaling and floating offshore platforms. The work within this thesis is made in collaboration between Halmstad University and Uppsala University. A 200-kW semi-guy-wired VAWT H-rotor, owned b

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28

Lundin, Rasmus, and Benjamin Beitler-Dorch. "Modelling and Analysis of Mobile Energy Transmission for Offshore Wind Power : An analysis of flow batteries as an energy transmission system for offshore wind power." Thesis, Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-40082.

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A comparison between a traditional fixed high voltage direct current energy transmission system and a mobile transmission system utilizing vanadium redox flow batteries has been conducted in this degree work. The purpose of this comparison was to evaluate if a mobile energy transmission system could be competitive in terms of energy efficiency and cost-effectiveness for use in offshore wind power applications. A literary study was made to fully grasp the various technologies and to create empirical ground of which cost estimation methods and energy calculations could be derived. A specific sc

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Devlin, Joseph. "A gas energy flow constrained unit commitment analysis of the British and Irish power systems considering high wind power penetrations." Thesis, Queen's University Belfast, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.706454.

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As members of the European Union (EU), the United Kingdom (UK) and Ireland are legally bound to integrate large penetrations of renewable energy into the power system in pursuit of EU 2020 targets. Wind power has emerged as the main renewable energy technology of choice to meet these targets. As the penetration of wind power continues to increase beyond 2020, a wider lens on the integration problem is required, It has been previously shown that gas generation due to its flexibility provision and traditionally high place in the merit order is the sacrificial generator. The ensuing dispatch sche

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Eramakkaveettil, Puthiyakath Jazeel. "INVESTIGATION INTO THE POTENTIAL OF ENERGY PRODUCTION FROM VEHICULAR MOTION INDUCED AIR FLOW IN MALAYSIA." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-434817.

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With the rise in energy consumption and usage by an exploding human population and higher quality of life, it is time to switch to renewable energy sources that have lower impacts on the natural world. Commercial scale wind power has seen tremendous growth in the last two decades and is expected to continue growing. But small-scale wind power still has tremendous potential in creating energy efficient homes micro-grid systems. Through this work, we explore the potential of micro VAWTs installed on highway medians to capture wind energy from moving vehicles. There are 2 main questions intended

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31

Athari, Mir Hadi. "Modeling Cascading Failures in Power Systems in the Presence of Uncertain Wind Generation." VCU Scholars Compass, 2019. https://scholarscompass.vcu.edu/etd/5936.

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One of the biggest threats to the power systems as critical infrastructures is large-scale blackouts resulting from cascading failures (CF) in the grid. The ongoing shift in energy portfolio due to ever-increasing penetration of renewable energy sources (RES) may drive the electric grid closer to its operational limits and introduce a large amount of uncertainty coming from their stochastic nature. One worrisome change is the increase in CFs. The CF simulation models in the literature do not allow consideration of RES penetration in studying the grid vulnerability. In this dissertation, we hav

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32

Yu, Bo. "Surface Mean Flow and Turbulence Structure in Tropical Cyclone Winds." FIU Digital Commons, 2007. http://digitalcommons.fiu.edu/etd/25.

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Hurricanes are one of the deadliest and costliest natural hazards affecting the Gulf coast and Atlantic coast areas of the United States. An effective way to minimize hurricane damage is to strengthen structures and buildings. The investigation of surface level hurricane wind behavior and the resultant wind loads on structures is aimed at providing structural engineers with information on hurricane wind characteristics required for the design of safe structures. Information on mean wind profiles, gust factors, turbulence intensity, integral scale, and turbulence spectra and co-spectra is essen

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33

Nguyen, Van-Dang. "High-Performance Finite Element Methods : with Application to Simulation of Diffusion MRI and Vertical Axis Wind Turbines." Licentiate thesis, KTH, Beräkningsvetenskap och beräkningsteknik (CST), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-225952.

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The finite element methods (FEM) have been developed over decades, and together with the growth of computer engineering, they become more and more important in solving large-scale problems in science and industry. The objective of this thesis is to develop high-performance finite element methods (HP-FEM), with two main applications in mind: computational diffusion magnetic resonance imaging (MRI), and simulation of the turbulent flow past a vertical axis wind turbine (VAWT). In the first application, we develop an efficient high-performance finite element framework HP-PUFEM based on a partitio

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34

Lidström, Erica. "Voltage Stability at Hydropower Stations Influenced by close-located Wind Farms." Thesis, Uppsala universitet, Elektricitetslära, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-181017.

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The number of integrated wind farms into the power system is increasing as well as the total installed wind power capacity, which may cause voltage stability concerns. Additionally, there are European Transmission System Operators (TSOs) that do notinvolve wind farms in contributing to the voltage control in any significant extent. In the on-going project by the European Network of Transmission System Operators for Electricity (ENTSO-E), to update the European grid requirements, this will probably be changed. The aim of this Master thesis is to demonstrate the voltage variations in the high vo

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35

Wendler, Ernst Richard Georg. "Variations on the double-multiple streamtube model for Darrieus straight-bladed vertical-axis wind turbines to improve predictions of performance and flow expansion." Tesis, Universidad de Chile, 2014. http://repositorio.uchile.cl/handle/2250/132048.

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Magíster en Ciencias de la Ingeniería, Mención Mecánica<br>Ingeniero Civil Mecánico<br>El propósito del presente trabajo es formular una herramienta computacional de bajo costo que determine la potencia y la expansión de flujo de turbinas eólicas de eje vertical (VAWTs) tipo Darrieus. Esta herramienta puede ser útil para predecir el desempeño aerodinámico de VAWTs en ambientes urbanos o en granjas eólicas. En este trabajo se realizan variaciones en el modelo doble-múltiple tubos de corriente (DMS) para turbinas Darrieus de álabes rectos (SB-VAWTs) con el fin de mejorar las predicciones de des

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Long, Chao. "Voltage performance in residential distribution networks with small wind turbines and battery electric vehicles, through probabilistic power flow analysis." Thesis, Glasgow Caledonian University, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.654762.

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Future electrical low voltage (LV) distribution networks are expected to have higher penetration of distributed generation (DG) systems, e.g. small wind turbines (SWTs), and battery electric vehicles (BEVs). The intermittent and time-varying characteristics of wind speed and BEV charging bring difficulties in evaluating the adverse performance, e.g. voltage violation and unbalance, on the residential distribution networks (RDNs). This thesis develops two probabilistic power flow methods, i.e. statistical time series (STS) and point estimate method (PEM), for evaluating voltage violation and vo

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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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Dal, Ponte Rosemar Cristiane. "Avaliação técnico-econômica de um aerogerador de eixo vertical utilizando diferentes tipos de geradores elétricos." Universidade Estadual do Oeste do Paraná, 2018. http://tede.unioeste.br/handle/tede/3778.

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Submitted by Rosangela Silva (rosangela.silva3@unioeste.br) on 2018-06-25T22:08:59Z No. of bitstreams: 2 Rosemar_C_ Dal Ponte.pdf: 2801946 bytes, checksum: 918b897f2bd7a01d32f68e66f844088d (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Made available in DSpace on 2018-06-25T22:08:59Z (GMT). No. of bitstreams: 2 Rosemar_C_ Dal Ponte.pdf: 2801946 bytes, checksum: 918b897f2bd7a01d32f68e66f844088d (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2018-03-09<br>With the constant increase in the need for electric ener

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39

Nasri, Amin. "On the Dynamics and Statics of Power System Operation : Optimal Utilization of FACTS Devicesand Management of Wind Power Uncertainty." Doctoral thesis, KTH, Elektriska energisystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-154576.

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Nowadays, power systems are dealing with some new challenges raisedby the major changes that have been taken place since 80’s, e.g., deregu-lation in electricity markets, significant increase of electricity demands andmore recently large-scale integration of renewable energy resources such aswind power. Therefore, system operators must make some adjustments toaccommodate these changes into the future of power systems.One of the main challenges is maintaining the system stability since theextra stress caused by the above changes reduces the stability margin, andmay lead to rise of many undesira

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Ajedegba, John Oviemuno. "Effects of blade configuration on flow distribution and power output of a zephyr vertical axis wind turbine." Thesis, 2008. http://hdl.handle.net/10155/11.

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Worldwide interest in renewable energy systems has increased dramatically, due to environmental concerns like climate change and other factors. Wind power is a major source of sustainable energy, and can be harvested using both horizontal and vertical axis wind turbines. This thesis presents studies of a vertical axis wind turbine performance for applications in urban areas. Numerical simulations with FLUENT software are presented to predict the fluid flow through a novel Zephyr vertical axis wind turbine(VAWT). Simulations of air flow through the turbine rotor were performed to analyze the pe

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JIANG, GUO SHENG, and 江國陞. "Numerical Study on the Flow Structures and Power Coefficients for Different Configurations of Small Vertical Axis Wind Turbines." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/45406654302909951228.

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碩士<br>逢甲大學<br>航太與系統工程學系<br>101<br>The vertical axis wind turbine, depending on the type of driving force can be divided into a lift type and drag type. The lift type has a high power coefficient, but requires a higher tip speed ratio, while for the drag-type, the opposite is true. The hybrid wind turbine is worth studying as it improves the power coefficient of low tip speed ratio by using of combination of drag type and lift type. In addition, the relationship between the flow structure of wind turbine and coefficient changes of the various types of wind turbines is worth clarifying. In this

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Yu-Cheng, Chanf, and 張寓程. "Optimal Power Flow of a Wind-Thermal Power System." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/04190706429927312554.

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碩士<br>明新科技大學<br>電機工程研究所<br>96<br>The design considerations and operating rules of power systems should be adjusted to satisfy the uncertainty of wind energy when wind power accounts for a large portion of a power system. This thesis proposes an Evolutionary Particle Swarm Optimization (EPSO) approach, and uses EPSO to solve the multi-objective optimal power flow (OPF) problem of a wind-thermal power system. This OPF solution maintains bus voltages in a feasible region, minimizes transmission losses, and improves voltage stability. Integrating wind power into a power system changes the power fl

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Fang, Shen-Wei, and 方慎偉. "Stress Evaluation of Wind Turbine of Small-Size Vertical Axis Wind Power Generator." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/35283698899651552620.

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碩士<br>國立高雄海洋科技大學<br>輪機工程研究所<br>98<br>This research has developed a process to analyze the loading, stress, and material selection of mini-size vertical axis wind power generators. The target wind power generator in the analysis rotates at 120 rpm, has blades of 2.25 m in height, and turbine rims of 2.25m in radius. The rim is composed of Y-shape beams, which is divided into horizontal beam and V-shape beams. The cross-section of the beam is rectangular. The loadings applied on the turbine include the radial and tangential airfoil forces due to the rotation of the blades, the centrifugal forc

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Chen, C. Y., and 陳建宇. "The Blade and Flow Flow Field Analysis of Vertical Axis Wind Turbine Rotors." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/27315618829453687426.

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碩士<br>清雲科技大學<br>機械工程所<br>98<br>The wind power is one kind of energy which the humanity uses most early. Earlier, wind energy is often converted into mechanical energy, used to finish human laborious work, such as sailing ship navigation, drawing water, grinding grain and so on. The modern science and technology may further transform the wind energy into the electrical energy, and improve the performance of wind energy storage and increase its application. This article take the vertical axis wind turbine blade design as a subject, and hoping to find optimal design parameters of the blades can m

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Cheng, Li-Wei, and 鄭力瑋. "Development of a Small-Scaled Vertical Axis Wind Power System." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/95126898286369317768.

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碩士<br>清雲科技大學<br>電機工程所<br>98<br>This thesis a small-scaled vertical axis wind power generation system was development. In the wind turbine side, the maximum power point tracking method was adopted to control the DC/DC boost chopper to achieve optimum maximum power output and enhance conversion efficiency. In the batteries side, a boost dc chopper was used to get the maximum power association with variation wind speed from the wind power generation system and supply power to batteries charge. Finally, DC power can be transformed into AC power by a single phase full-bridge inverter. The voltage s

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Lo, Tsung-Yi, and 羅宗義. "The flow driven coupled motion analysis of wind turbine for small vertical axis wind turbine." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/75727831610394907094.

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碩士<br>國立中興大學<br>機械工程學系所<br>96<br>This thesis studies the flow characteristics and output performance of a small vertical axis wind turbine (VAWT ) by way of numerical simulation. The CFD software, Fluent, is employed to analyze the flow characteristics around the rotating airfoils and the output torque for the specified VAWT. According to the results, the related output performance (instantaneous torque and the rotating kinetic energy) of the VAWT will be evaluated for the first step to design of a small VAWT. We employ a small-sized vertical axis wind turbine with three blades rotating about

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Li, Ruey-Ming, and 李瑞銘. "A Study on Power Flow of Wind Farms." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/94230779702535981870.

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碩士<br>國立成功大學<br>電機工程學系碩博士班<br>95<br>The purpose of this thesis is to study the power flow of wind farms consisting of multiple wound-rotor wind induction generators (WIGs) connected to a power system using a series of suitable mathematical models for studying the WIGs. The thesis determines the influence of the machine output power subject to the variations of rotor impedance of the studied WIGs under steady-state conditions. The influence caused by the wind speed and the associated slip of a wind farm consisting of multiple WIGs on the power flow is examined. To understand the relationship be

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YANG, SHIU-LIN, and 楊旭霖. "Numerical Simulation of the Flow Field of Vertical-Axis Wind Turbines." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/95838143972366869196.

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碩士<br>淡江大學<br>航空太空工程學系碩士班<br>101<br>This study used the commercial CFD software, FLUENT, to simulate the flow field of VAWTs. The governing equations are the two-dimensional, unsteady, incompressible, turbulent Navier-Stokes equations. The results show that the residual values should be set small enough to allow at least 200 iterations within a time step in order to obtain a converged solution. This is due to the highly unsteady and turbulent flow of VAWTs. The time step can be set larger to speed up the calculation if 200 iterations requirement is satisfied. The performance data of three

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Jhang, Jie-Ling, and 張潔舲. "Flow simulation of hybrid lift and drag type vertical-axis wind turbines." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/61404784500863313291.

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碩士<br>淡江大學<br>航空太空工程學系碩士班<br>103<br>This thesis simulated hybrid lift and drag type vertical-axis wind turbines using CFD software, FLUENT. The governing equations were two-dimensional, unsteady, incompressible, turbulent Navier-Stokes equations. We used Pro/E to draw wind turbine models, and then employed Gambit to generate unstructured grids and set the boundary conditions. The simulations included three parts. The first part simulated drag type wind turbines. We observed the torque generating ability of drag type wind turbines. We installed deflectors to study their influence on the output

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Lin, Yu-Hung, and 林育弘. "A Study on Power Flow of Wind Induction Generators." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/65204514850440805371.

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碩士<br>國立成功大學<br>電機工程學系碩博士班<br>93<br>The purpose of this thesis is to study the power flow of wound rotor wind induction generators (WIG) connected to a power system. The research of the thesis is to determine the influence of the machine output power subject to the variations of external rotor impedance of the studied WIG under steady-state conditions. A series of suitable mathematical formulas for the analyses of WIG are discussed and reformed into novel characteristic power circles on the complex plane. The characteristic power circles are powerful tools for understanding the power flow of W

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