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Dissertations / Theses on the topic 'Wind farm performance modeling'

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1

Ebenhoch, Raphael. "Simplified modeling of wind-farm flows." Thesis, KTH, Strömningsfysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-177309.

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Abstact: In order to address the wind-industry's need for a new generation of more advanced wake models, which accurately quantify the mean flow characteristics within a reasonably CPU-time, the two-dimensional analytical approach by Belcher et al. (2003) has been extended to a three-dimensional wake model. Hereby, the boundary-layer approximation of the Navier-Stokes equations has been linearized around an undisturbed baseflow, assuming that the wind turbines provoke a small perturbation of the velocity field. The conducted linearization of the well established actuator-disc theory brought va
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2

Haugsten, Hansen Thomas. "Offshore Wind Farm Layouts : Performance Comparison for a 540 MW Offshore Wind Farm." Thesis, Norwegian University of Science and Technology, Department of Electrical Power Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9990.

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<p>This master thesis has been written at the Department of Electric Power Engineering at the Norwegian University of Science and Technology. The work has been carried out at the Royal Institute of Technology in Stockholm, where the author spent the last year of his studies as an exchange student. In the thesis, six different designs of the electrical grid of a 540 MW offshore wind farm, placed 100km off the Norwegian coast, have been studied and compared. At this distance, AC cable transmission might be difficult because of the reactive power production in the cables. Taking this into consid
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3

Li, Simeng. "WIND ARRAY PERFORMANCE EVALUATION MODEL FOR LARGE WIND FARMS AND WIND FARM LAYOUT OPTIMIZATION." Case Western Reserve University School of Graduate Studies / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=case1405080318.

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4

Zhou, Fengquan 1969. "Modeling and analysis of wind farm impacts on power systems." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82650.

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The wind energy industry has undergone a dramatic transformation during the last decade. The total operating wind power capacity in the world has increased greatly. As more and more attention is paid to the increase in both the size and number of wind farms, a number of problems should be investigated in more detail. The voltage stability problem primarily focuses on the reactive power management that affects voltage stability and transmission losses. Wind power farm installations that have the potential to displace a large percentage of fossil-fuel generation must be designed to avoid
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5

Karlsson, Rikard. "Power system performance when implementing dynamic rating on a wind farm connected transformer." Thesis, KTH, Elektroteknisk teori och konstruktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-215949.

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In this study, dynamic transformer rating (DTR) is applied on a medium power transformer thatis in use in the regional transmission grid. The transformer’s rated apparent power is 63 MVA, itis connected between a wind farm at 22kV and the grid, K¨orsb¨arsdalen, at 135kV. Power systemanalysis are carried out on the grid, with the objective to test how DTR and increased wind poweraffects the grid performance with respect to reliability, voltage stability and active losses.Historical measurements of ambient temperature and transformer loading is used to calculatefree transformer capacity based on
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6

Skolthanarat, Siriya. "The Modeling and Control of a Wind Farm and Grid Interconnection in a multi-machine system." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/28920.

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This dissertation focuses on the modeling and control of WECS (Wind Energy Conversion System) in a multi-machine system. As one of the fastest growing renewable energy resources, the trend of wind energy changes to variable speed wind turbines. The concept of the variable speed is based on the variable speed according to the instantaneous wind speed of wind turbines. Since the utility grid requires the stable frequency and magnitude voltages, there must be grid interconnection of the wind farm and the utility grid. The grid interconnection must support the concept of the variable speed wind tu
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7

Stival, Leandro Jose Lemes. "A study on wind assessment on the wind power performance : wind shear and turbulence intensity effects besides the wake modeling for a single wind turbine." reponame:Repositório Institucional da UFPR, 2017. http://hdl.handle.net/1884/49088.

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Orientador : Prof. Dr. Alexandre Kolodynskie Guetter<br>Coorientador : Prof. Dr. Fernando Oliveira Andrade<br>Dissertação (mestrado) - Universidade Federal do Paraná, Setor de Tecnologia, Programa de Pós-Graduação em Engenharia de Recursos Hídricos e Ambiental. Defesa: Curitiba, 04/04/2017<br>Inclui referências : f.91-97<br>Resumo: A energia eólica cresceu significativamente, porém a eficiência de geração da fonte eólica gira em torno de 30% da energia cinética disponível no vento. Por este motivo é de extrema importância que estudos sejam elaborados afim de aumentar a eficiência na geração de
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8

Zhang, Haibo. "Analysis and performance enhancement of a series parallel offshore wind farm topology integrated into a HVDC grid." Thesis, Lille 1, 2017. http://www.theses.fr/2017LIL10156/document.

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L'exploitation de l'énergie éolienne loin des côtes, bien qu'abondante, dépend du transport de puissance en Courant Continu Haute Tension (HVDC) qui nécessite une sous-station placée sur une plateforme dédiée. Cette plate-forme offshore étant volumineuse, son cout d'installation est élevé et sa mise en œuvre est compliquée. Cette thèse s'intéresse à une topologie de ferme éolienne offshore DC qui transporte son énergie vers l'onshore sans utiliser de sous-station offshore. Ce type de Ferme Eolienne est appelé Ferme Eolienne Série Parallèle (SPWF). Il est composé de plusieurs grappes d'éolienne
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9

Danish, Farzana. "Examination of the Performance of AERMOD Model under Different Wind Conditions." University of Toledo / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1188493032.

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10

Huang, Qiuyi. "Wind Turbine Performance Assessment Modeling Using Machine Learning Method for Condition Based Maintenance." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-253276.

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This thesis work proposes a performance assessment framework to estimateoperation states of wind turbines for the sake of condition monitoring. Theframework uses the data in the supervisory control and data acquisition systemsas original input and some machine learning methods including K-NearestNeighbour, K-Means Clustering, Support Vector Machine and Artificial NeuralNetwork are implemented to analyze the data. The framework mainly consistsof three stages: power curve prediction, real time power tracking and turbineperformance assessment. At the first stage, two main methods including quarti
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11

Cao, Weiran. "Linear Modeling of DFIGs and VSC-HVDC Systems." Thesis, KTH, Elektrisk energiomvandling, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-177643.

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Recently, with growing application of wind power, the system based on the doubly fedinduction generator (DFIG) has become the one of the most popular concepts. Theproblem of connecting to the grid is also gradually revealed. As an effective solution toconnect offshore wind farm, VSC-HVDC line is the most suitable choice for stabilityreasons. However, there are possibilities that the converter of a VSC-HVDC link canadversely interact with the wind turbine and generate poorly damped sub-synchronousoscillations. Therefore, this master thesis will derive the linear model of a single DFIG aswell as
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12

Ali, Muhammad Anttho. "In-cloud ice accretion modeling on wind turbine blades using an extended Messinger model." Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53870.

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Wind turbines often operate under cold weather conditions where icing may occur. Icing causes the blade sections to stall prematurely reducing the power production at a given wind speed. The unsteady aerodynamic loads associated with icing can accelerate blade structural fatigue and creates safety concerns. In this work, the combined blade element-momentum theory is used to compute the air loads on the baseline rotor blades, prior to icing. At each blade section, a Lagrangian particle trajectory model is used to model the water droplet trajectories and their impact on the blade surface. An ext
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13

James, Carl S. "Evaluation of COAMPS performance forecasting along coast wind events during a frontal passage." Thesis, Monterey, California. Naval Postgraduate School, 2005. http://hdl.handle.net/10945/2281.

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Approved for public release, distribution is unlimited<br>Performance of high resolution mesoscale models has been in a continuous state of refinement since their inception. Mesoscale models have become quite skillful in forecasting synoptic scale events such as mid-latitude cyclones. However, atmospheric forcing becomes a much more complicated process when faced with the challenge of forecasting near topography along the coastline. Phenomena such as gap flows, blocked flow winds and low level stratification become important to predictability at these scales. The problem is further complicated
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14

Townsend, Benjamin William. "Characterization and Lifetime Performance Modeling of Acrylic Foam Tape for Structural Glazing Applications." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/35233.

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This thesis presents the results of testing and modeling conducted to characterize the performance of 3Mâ ¢ VHBâ ¢ structural glazing tape in both shear and tension. Creep rupture testing results provided the failure time at a given static load and temperature, and ramp-to-fail testing results provided the ultimate load resistance at a given rate of strain and temperature. Parallel testing was conducted on three structural silicone sealants to compare performance. Using the time temperature superposition principle, master curves of VHB tape storage and loss moduli in shear and tension were de
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15

Herrera, Ramirez Milton Mauricio. "Modeling Alternatives Sustainable-Energy-Policy for the Supply Chain of Wind Power in Brazil." Doctoral thesis, Università degli Studi di Palermo, 2020. http://hdl.handle.net/10447/394514.

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Renewable energy studies have received high attention in the last few years due the increasing deployment of alternatives such as wind, solar and biomass, as a result of the urgency in reducing fossil fuels consumption. This situation has involved an important challenge for long-term renewables policy and energy system planning. Brazil is the richest country in terms of renewable sources in Latin American. Brazil has energy generation portfolio not much different form the Colombia one, and the understanding of this very important country will contribute to inspire other countries in the region
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16

Honnanayakanahalli, Ramakrishna Prajwal. "MODELING, SIMULATION AND OPTIMIZATION OF A SUBMERGED RENEWABLE STORAGE SYSTEM INTEGRATED TO A FLOATING WIND FARM : A feasibility case study on the Swedish side of the Baltic sea, based on the geographical and wind conditions." Thesis, Mälardalens högskola, Framtidens energi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-42321.

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Mathematical modeling and simulations of a submerged renewable storage system integrated to a wind farm, chosen based on the geographical and wind conditions at the Baltic Sea, gives insight on the feasibility of the submerged renewable storage and an approximation of the payback period and profits that could be generated. Genetic Algorithms were used to obtain the optimal number of spheres for a certain depth, based on 2 objective functions I.e. Minimum Life Cycle Cost (LCC) and maximum reduction in wind curtailment. The new arrangement concept shows that the Initial Capital Cost (ICC) could
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17

Cho, Yongnam. "Modeling methodology of converters for HVDC systems and LFAC systems: integration and transmission of renewable energy." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49064.

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The major achievements of this work are based on two categories: (A) introduction of an advanced simulation technique in both time domain and frequency domain, and (B) realistic and reliable models for converters applicable to analysis of alternative transmission systems. The proposed modeling-methodology using a combination of model quadratization and quadratic integration (QMQI) is demonstrated as a more robust, stable, and accurate method than previous modeling methodologies for power system analyses. The quadratic-integration method is free of artificial numerical-oscillations exhibited by
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18

Kirby, Elizabeth Ann. "Quantification of the Impact of Intermittent Renewable Penetration Levels on Power Grid Frequency Performance Using Dynamic Modeling." ScholarWorks @ UVM, 2015. http://scholarworks.uvm.edu/graddis/519.

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As the technology behind renewable energy sources becomes more advanced and cost-effective, these sources have become an ever-increasing portion of the generation portfolios of power systems across the country. While the shift away from non-renewable resources is generally considered beneficial, the fact remains that intermittent renewable sources present special challenges associated with their unique operating characteristics. Because of the high variability of intermittent renewables, the frequency performance of the system to which they are connected can degrade. Generators assigned to reg
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19

Wang, Biao. "Les impacts de la morphologie urbaine sur le vent : performance d'énergie éolienne à l'échelle de quartier." Thesis, Toulouse, INSA, 2015. http://www.theses.fr/2015ISAT0004/document.

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Ce travail vise à modéliser la propagation du vent par des techniques de simulation de CFD dans des tissus urbains contrastés à l’échelle du quartier (450m × 450m) afin d'évaluer les impacts de la morphologie urbaine sur le potentiel énergétique éolien. Face aux problèmes environnementaux locaux et globaux, le développement des énergies renouvelables devient de plus en plus urgent à l’échelle mondiale. Notre objectif est d’adapter la morphologie urbaine au développement du captage de l’énergie éolienne. Pour ce faire, deux questions fondamentales sont posées : quels sont les impacts de la morp
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20

Joubert, Retief. "Influence of geometric and environmental parameters on air-cooled steam condenser performance." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4153.

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Thesis (MScEng (Mechanical and Mechatronic Engineering))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: Air-cooled steam condensers (ACSCs) are used in the power generation industry to directly condense turbine exhaust steam in areas where cooling water is expensive or unavailable. Large axial flow fans force ambient air through A-frame heat exchanger bundles made up of a number of rows of finned tubes through which the steam is ducted and consequently condensed during the heat transfer process to the air. The heat rejection rate or performance of an ACSC is proportional to the a
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21

Stüker, Eduardo. "Análise da influência de um parque eólico no escoamento médio atmosférico na região do pampa gaúcho." Universidade Federal do Pampa, 2017. http://dspace.unipampa.edu.br:8080/jspui/handle/riu/1954.

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Submitted by Cátia Araújo (catia.araujo@unipampa.edu.br) on 2017-09-29T12:46:00Z No. of bitstreams: 1 Eduardo Stüker - 2017.pdf: 7313484 bytes, checksum: 62b33528c60c5929fa82fa9096afeeee (MD5)<br>Approved for entry into archive by Marlucy Farias Medeiros (marlucy.farias@unipampa.edu.br) on 2017-09-29T16:25:01Z (GMT) No. of bitstreams: 1 Eduardo Stüker - 2017.pdf: 7313484 bytes, checksum: 62b33528c60c5929fa82fa9096afeeee (MD5)<br>Made available in DSpace on 2017-09-29T16:25:01Z (GMT). No. of bitstreams: 1 Eduardo Stüker - 2017.pdf: 7313484 bytes, checksum: 62b33528c60c5929fa82fa9096afeeee (MD5)
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22

ZENG, JYUN-JIE, and 曾俊傑. "Study of Equivalent Wind Farm Modeling and Simulation." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/8z4bj6.

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碩士<br>國立中正大學<br>電機工程研究所<br>107<br>The power system stability for wind farm integration has become more important as wind generation increases. A wind farm may contain hundreds of wind turbines and thus the simulations for transient responses based on the complex model of wind turbines consumes a lot of simulation time. Therefore, this work used the Fuzzy C-means (FCM) clustering method to divide the wind turbines into different groups for the simulation. First, this work applies non-linear wake model to precisely calculate the wake effect on each wind turbine. Then this work performs the wind-
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23

Chuang, Chih-mei, and 莊智媚. "The Performance and Risk Evaluation of Offshore Wind Farm Power of Taiwan." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/amv2cd.

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碩士<br>佛光大學<br>經濟學系<br>96<br>The Performance and Risk Evaluation of Offshore Wind Farm Power of Taiwan Student: Chih-mei Chuang Advisor:Dr. Shun –Yi Shei Abstract In 1997, “the Beijing protocol” (Kyoto Protocol) to cope with the crucial global agenda strategy for greenhouse effect have requested protocol appendix I countries which were included 38 developed countries and the European Union (EU) to reduce the greenhouse gas emissions back into 5.2% average again from 2008 to 2012, and return to the emissions standard in 1990. The “Beijing protocol” activated on February 16, 2005, tho
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24

Huang, Chiang-Hsun, and 黃將勛. "Application of Blade Flow Characteristics to the Performance Improvement of Wind Farm." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/05467315356908397240.

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碩士<br>國立臺灣海洋大學<br>機械與機電工程學系<br>102<br>This paper explores the different arrangement modes of side-by-side and Tandem of single and multiple wind turbine tower under the low Reynolds number, to study the influences of wake flow field behaviors, speed characteristics, vortex street and different horizontal and longitudinal spacing ratio (g*﹐L*) on the wake flow field. The first part goes into the single wind turbine tower flow field characteristics and aerodynamic force performance at different heights; in open-type wind tunnel, the flow field can be visualized by streak line to observe the flow
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25

Gao, Xiaodan. "Advanced doubly fed induction generator variable speed wind turbine and wind farm control method for grid connection." Thesis, 2017. http://hdl.handle.net/1959.13/1351670.

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Research Doctorate - Doctor of Philosophy (PhD)<br>Owing to the global concerns on climate change and world-wide carbon pricing policies, the use of conventional fossil fuels has been descending these years. Instead, renewable energy is getting increasing popularity in the power industry. Specifically, wind power occupies a large proportion in the current energy context due to the relatively mature generation and operation techniques. With the increasing penetration of wind power into the grid, new challenges are emerging in front of the grid administrators. A series of requirement, such as po
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26

Chen, Sheng-Po, and 陳聖博. "Photochemical modeling and evaluating the performance of feature emissions and wind field inputs." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/18273585164729755587.

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碩士<br>國立中興大學<br>環境工程學系所<br>94<br>In this study, a photochemical model (Taiwan Air Quality Model, TAQM) were used to simulate the ozone episodes in central Taiwan and evaluate the performance of regional-scale photochemical modeling results in different kinds of feature emissions, like NOx and VOC, and meteorological parameter, like wind inputs. When doing the photochemical model simulation, we need two input data, emissions and meteorological modeling results, which is obtained by TEDS-5.1 (2002) and the Fifth-Generation NCAR / Penn State Mesoscale Model (MM5) simulation. When the two photoche
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27

Kim, Hagkwen. "Reliability Modeling and Simulation of Composite Power Systems with Renewable Energy Resources and Storage." Thesis, 2013. http://hdl.handle.net/1969.1/151020.

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This research proposes an efficient reliability modeling and simulation methodology in power systems to include photovoltaic units, wind farms and storage. Energy losses by wake effect in a wind farm are incorporated. Using the wake model, wind shade, shear effect and wind direction are also reflected. For solar modules with titled surface, more accurate hourly photovoltaic power in a specific location is calculated with the physical specifications. There exists a certain level of correlation between renewable energy and load. This work uses clustering algorithms to consider those correlated v
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28

Le, Ha Thu. "Increasing wind power penetration and voltage stability limits using energy storage systems." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-05-864.

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The research is motivated by the need to address two major challenges in wind power integration: how to mitigate wind power fluctuation and how to ensure stability of the farm and host grid. It is envisaged that wind farm power output fluctuation can be reduced by using a specific type of buffer, such as an energy storage system (ESS), to absorb its negative impact. The proposed solution, therefore, employs ESS to solve the problems. The key research findings include a new technique for calculating the desired power output profile, an ESS charge-discharge scheme, a novel direct-calculation (op
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