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‣ Experimental and numerical study of a diffuser augmented wind turbine - DAWT

Maia, Lino André Bala
Fonte: Instituto Politécnico de Bragança Publicador: Instituto Politécnico de Bragança
Tipo: Dissertação de Mestrado
Português
Relevância na Pesquisa
68.65456%
The effect of concentrator-diffuser (C-D) of a shrouded wind turbine was studied. The main objective involved assessing the increment that this device induces in productivity of small wind turbines. Also the aerodynamic performance of two scaled blade models were studied in terms of drag and lift forces as a function of angle of attack for Re of 15714 and 37143. Wind turbine power performance was evaluated in terms of power coefficient values. Laboratory measurements showed that improvements were obtained on the electrical power values, resulting in an average increase of 90% in the corresponding power coefficient values. A more pronounced enhancement is described at lower wind speed values. CFD calculations were performed at flow values of 6 and 14 m/s to the C-D device. CFD calculations performed an evaluation of velocity experienced in the action rotor zone, which provided maximum increases of 81 % and 86 %, respectively. Numerical simulations and experimental measurements were performed also to the blades, where the results obtained were similar, providing a difference of 25 % for drag forces.; Neste trabalho estudou-se o efeito do concentrador-difusor (C-D) numa turbina eólica encapsulada. O principal objetivo deste estudo é avaliar o incremento que o C-D induz na produtividade de turbinas eólicas de pequena dimensão. Foi também avaliado o desempenho aerodinâmico de dois modelos de uma pá com diferentes razões de escala. Estes modelos foram avaliados em termos de forças de arrasto e de sustentação em função do ângulo de ataque...

‣ Análise numérica e experimental de perfis aerodinâmicos para aprimoramento do projeto de turbinas H-Darrieus; Airfoil numerical and experimental analisys for h-darrieus wind turbine optimization

Reis, Guilherme Leo Rossi
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Trabalho de Conclusão de Curso Formato: application/pdf
Português
Relevância na Pesquisa
68.84806%
Este trabalho consiste na análise da influência de uma cavidade na parte inferior de um perfil aerodinâmico utilizado em turbinas eólicas H-Darrieus. A análise é feita utilizando a dinâmica dos fluídos computacional e testes experimentais. Utiliza-se o software comercial ANSYS – Fluent 14.0 para a solução das equações da conservação de massa e de Navier-Stokes com média de Reynolds. Os modelos de turbulência Spalart-Allmars, k-epsilon, k-ω e k-ω SST são utilizados e comparam-se alternativas de discretização espacial com a finalidade de avaliar a influência nos valores obtidos com uma velocidade prescrita na entrada do domínio de 10m/s. Pelas forças originadas pelo atrito viscoso e pelos gradientes de pressão nas pás, obtêm-se o coeficiente de torque e de potência em cada uma das simulações. Através da integração das pressões e das forças de arrasto sobre os perfis testados em túnel aerodinâmico, levantam-se as curvas dos coeficientes de sustentação e arrasto de cada perfil, respectivamente, através das quais é possível obter o torque gerado pela turbina. Os resultados encontrados são bastante representativos para o fenômeno estudado, uma vez que as velocidades prescritas são da ordem de operação desse tipo de turbina. Mostra-se que o perfil com cavidade apresenta um melhor desempenho em relação ao perfil original para uso em turbinas H-Darrieus.; This work consist on the analysis of the influence of a cavity on the lower surface of an airfoil used in H-Darrieus Wind Turbine. The analysis is performed using Computational Fluid Dynamics and experimental tests. The commercial software ANSYS – Fluent 14.0 is used in order to solve the continuity and Reynolds-Averaged Navier-Stokes equations. Spalart-Allmars...

‣ Maintenance costs of a pitch control device of a wind turbine

Carvalho, Mariana; Nunes, Eusébio P.; Telhada, José
Fonte: International Association of Engineers (IAENG) Publicador: International Association of Engineers (IAENG)
Tipo: Conferência ou Objeto de Conferência
Publicado em /07/2013 Português
Relevância na Pesquisa
68.723994%
Although the wind turbines are nowadays the principal source of wind energy production, the technical information publicly known about these machines is still very scarce. Information related to failure modes, unavailability and maintenance costs of these systems remain confidential and only the manufacturer has knowledge about them. To be able to optimize the efficiency, to guarantee the security and to negotiate better warranty and maintenance contracts, it is necessary to know more information about the operation and maintenance and replacement costs of subsystems of a wind turbine. To this end, and based on two years of operation, this paper exhaustively analyses an active power control system, of 21 identical wind turbines, installed in a wind farm in Portugal. The emphasis of this study is on its operation, availability and maintenance and replacement costs, obtaining, in particular, an estimate for the total maintenance cost of the active pitch control device, one of the most important components of the turbine, which automatically manages the position and operation of blades, according to wind direction and speed, thus maximizing gathered electrical power or stopping the operation whenever bad weather conditions exist.; This work was financed with FEDER Funds by Pro-grama Operacional Fatores de Competitividade – COMPETE and by National Funds by FCT –Fundação para a Ciência e Tecnologia...

‣ Application of a discrete adaptive LQG and fuzzy control design to a wind turbine benchmark model

Melício, Rui; Mendes, Victor; Viveiros, Carla; Igreja, José Manuel
Fonte: Universidade de Évora Publicador: Universidade de Évora
Tipo: Aula
Português
Relevância na Pesquisa
68.65456%
This paper deals with a wind turbine control simulation supported by the use of computational tools appropriate to simulate complex systems. High performance and reliability are required for wind turbines to be competitive within the energy market. A key challenge for control systems is the wind power which is an uncontrolled input and also acts as a disturbance. A discrete adaptive LQG (linear quadratic) as well as a fuzzy PI control design of publicly available wind turbine benchmark models are proposed and simulation results by Matlab/Simulink are shown in order to prove the effectiveness of the design.

‣ Analysis and modelling of the effects of inertia and parameter errors on wind turbine output power.

Tang, Chun
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Tese de Doutorado
Publicado em //2010 Português
Relevância na Pesquisa
69.391357%
Wind energy is an important renewable energy source. The average output power of a wind turbine is one of the main concerns in wind generation systems. The factors which affect the average output power include the location, the wind characteristics, the design of the blades and the control system etc. In this thesis, the effects of the inertia of a wind turbine under dynamic wind speed conditions, and the effects of the parameter errors under steady-state operation on the average output power are examined. Maximum power point tracking is used to control the generator of a wind turbine in order to maximise the electrical output power of the wind turbine. However, under rapidly changing wind conditions, the output power of the wind turbines is reduced due to their inertia preventing them operating at the optimal turbine speed. Limited research into analysing this power reduction has been performed. Even under steady-state operating conditions, the maximum power coefficient and the optimal tip-speed ratio of the wind turbine generally need to be known for maximum power point tracking. Errors in the estimated parameters will result in an output power reduction for the wind turbine. Therefore, an understanding of the sensitivity of wind turbine blade parameter errors to the output power reduction under steady-state conditions of wind turbines is also a significant issue. The first part of the work in this thesis investigates the wind turbine output power reduction due to inertia under dynamic wind speed conditions. It is assumed that the wind turbine blade characteristics is known accurately and that a maximum power point strategy based on controlling the generator input torque as a function of generator speed is used (optimal torque control). The concept of the small-signal turbine time constant is introduced to denote the time constant of the response of a wind turbine for a small change in wind speed under the maximum power point operating conditions. It is shown that the turbine time constant is inversely proportional to the average wind speed...

‣ CFD Investigation on the aerodynamic characteristics of a small-sized wind turbine of NREL PHASE VI operating with a stall-regulated method

Mo, Jang-Oh; Lee, Young-Ho
Fonte: Springer Publicador: Springer
Tipo: Artigo de Revista Científica
Publicado em //2012 Português
Relevância na Pesquisa
69.051094%
The objective of this investigation is to clearly understand the aerodynamic characteristics of a small-sized wind turbine of NREL Phase VI, operating with a stall-regulated method using CFD code. Based on this, it is possible to provide turbine designers with the aerodynamic design data to increase efficiency and improve performance in the design phase of future small-sized wind turbine blades. Moreover, a comparison was made between experimental datasets, in order to verify the reliability and validity of the analysis results. The first height in the normal direction from the surface of a rotor blade is about 0.2 mm, and the average value of y+ is about 7 at 7 m/s. The domain is chosen to consist of only two hexahedral mesh regions, namely the interior region, including the wind turbine blade, and the external region excluding the rectangle. The total cell number of the numerical grid is about Ng = 3.0 × 106. Five different inflow velocities, in the range Vin = 7.0−25.1 m/s, are used for the rotor blade calculations. The calculated power coefficient is about 0.35 at a TSR of 5.41, corresponding to 7 m/s, and showed considerably good agreement with the experimental measurements, to within 0.08%. It was observed that the 3-D stall begins to generate near the blade root at a wind speed of 7 m/s. Therefore...

‣ Turbulent wake study of the NREL phase VI wind turbine in a virtual wind tunnel using Large Eddy Simulation

Choudhry, A.; Mo, J.; Arjomandi, M.; Lee, Y.H.
Fonte: Engineers Australia; CDROM / DVDROM Publicador: Engineers Australia; CDROM / DVDROM
Tipo: Conference paper
Publicado em //2012 Português
Relevância na Pesquisa
68.899297%
The objective of the current investigation is to achieve a better understanding of the turbulent wake characteristics behind a wind turbine for the purpose of the improvement of the overall wind farm efficiency and a better prediction of the fatigue loads on tandem wind turbines. Large Eddy Simulation was performed at a low wind speed of 7m/s in a numerical wind tunnel model with dimensions similar to the NASA Ames Wind Tunnel (24.4 m x 36.6 m). An ANSYS CFD Fluent solver based on the dynamic Smagorinsky-Lilly model was employed to simulate the flow surrounding the wind turbine placed inside the numerical wind tunnel. For validation purposes, the aerodynamic characteristics of the blade were compared with the published experimental data of the NREL Phase VI. A good agreement was found between the experimental and the numerical results for the surface pressure distributions along the blade. It was observed that in the near-wake the turbulence intensity was a maximum of 12.12% at a distance of three rotor diameters downstream, after which a gradual decrease in the turbulence intensity was observed due to the wake instability. In the far-wake region, the turbulence intensity showed a tendency to increase, due to the presence of counter-rotating helical vortices determining the dynamics of far-wake. The system of vortices in the near-wake becomes unstable and breaks down due to the wake instability at a distance of approximately five rotor diameters downstream of the wind turbine. The vortex breakdown was used to define the boundary between the near and far-wake regions. The collapsed spiral wake was found to spread in all directions in the far-wake resulting in the formation of the two counter-rotating vortices which caused the gradual increase of turbulent intensity. The results and related discussion of the turbulent wake characteristics are presented in the current article.; Amanullah Choudhry...

‣ Horizontal axis wind turbine dynamic stall predictions based on wind speed and direction variability

Choudhry, A.; Arjomandi, M.; Kelso, R.
Fonte: Professional Engineering Publishing Ltd Publicador: Professional Engineering Publishing Ltd
Tipo: Artigo de Revista Científica
Publicado em //2013 Português
Relevância na Pesquisa
68.899297%
The onset of dynamic stall in horizontal axis wind turbines (HAWTs) is related to the rapid increase in the angle of attack caused by sudden changes in wind speed and direction. In order to relate the changes in wind speed and direction with the variations in the blade-section angle of attack, an analytical model is proposed to determine the regions of the blade affected by dynamic stall. The so-called threshold radius has been identified and defined as the percentage of the blade length from the horizontal axis wind turbines hub beyond which the probability of dynamic stall occurrence falls to zero. High quality wind data were acquired to determine the average wind conditions that serve as the model inputs. It is shown that the rate of change of wind speed, due to gusts or the average turbulence, can cause large regions of dynamic stall on the wind turbine blade. Other parameters, such as the yaw misalignment and the rate of change of yaw angle are shown to be the cause of asymmetrical distribution of threshold radius with azimuth and also serve to increase the affected regions. Finally it is shown that the type of airfoil used in the turbine blade also has a significant effect on the threshold radius due to the different limiting reduced frequencies.; Amanullah Choudhry...

‣ Estudo do comportamento vibratório torcional do trem de potência de um aerogerador de eixo horizontal; Torsional vibratory behavior study of a powertrain in horizontal axis wind turbine

Gustavo Roberto de Souza Silva
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 30/07/2015 Português
Relevância na Pesquisa
69.011294%
Entre os anos de 2004 e 2014 a capacidade total instalada de aerogeradores no mundo apresentou um crescimento de aproximadamente 700%. Este crescimento tão acentuado tem ocorrido devido à atual preocupação mundial com o desgaste do planeta e a consequente busca por novas fontes de energia renováveis e limpas. Evidentemente, esta situação tem atraído muitos investimentos para o estudo de geradores eólicos mas o que se observa na prática é que um número significativo de falhas prematuras ainda ocorrem nos componentes dos aerogeradores. Problemas com a caixa de engrenamento estão entre as principais causas de downtime de um aerogerador. Estudos ainda mais profundos relacionados a este assunto são necessários para o desenvolvimento de projetos de turbinas eólicas mais confiáveis. O presente trabalho se insere neste contexto analisando o comportamento vibratório torcional do trem de potência de um aerogerador de eixo horizontal de velocidade variável. Para tanto, utiliza-se um modelo de múltiplos corpos no qual são incorporados os efeitos da rigidez variável dos engrenamentos helicoidais, fazendo com que o sistema resultante seja linear e variante com o tempo. Os parâmetros modais - frequências naturais, fatores de amortecimento e modos de vibrar - do sistema linear e invariante no tempo equivalente são apresentados. Foram também realizadas simulações com o aerogerador operando nas condições de velocidades de rotação constante e variável...

‣ Investigation of wind turbine flow and wake

MASSOUH, Fawaz; DOBREV, Ivan
Fonte: JSME Publicador: JSME
Português
Relevância na Pesquisa
68.65456%
This paper is dedicated to the investigation and analysis of wind turbine wake. An experimental work is undertaken in wind tunnel on a horizontal axis wind turbine model. The velocity field in the wake is measured using PIV with phase synchronization in order to relate velocity and vortices to the rotating blades. The tip vortices are investigated in successive azimuthal positions of the rotor. A specially developed algorithm based on the circulation maximum detects the positions of the vortex cores and permits to use conditional averaging technique. The analysis of obtained velocity fields enables to determine the vortex core diameter, the swirl velocity distribution and the vortex diffusion as functions of the vortex age. The quality of obtained results permits to use them as reference for the validation of numerical computations.

‣ Experimental and numerical study of flow around a wind turbine rotor; Etude numérique et expérimentale de l'écoulement autour d'un rotor éolien

DOBREV, Ivan; MASSOUH, Fawaz; MEMON, Asif
Fonte: Inderscience Publicador: Inderscience
Português
Relevância na Pesquisa
68.65456%
An improved model of an actuator surface is proposed, representing the flow around a wind turbine. This model was developed in conjunction with a Navier-Stokes solver using a blade element method for the calculation of power and wake development. Blades have been replaced with thin surfaces, and a boundary condition of “pressure discontinuity” has been applied with rotor inflow and blade-section characteristics. The proposed improvement consists of applying tangential body forces along the chord, in addition to normal body forces resulting from pressure discontinuity along the blade cross-section. The proposed model has been validated for the flow around a horizontal-axis wind turbine. The results obtained from the proposed model are compared with the experimental results obtained from PIV-wind tunnel techniques. The comparison has displayed the necessity of the proposed model for accurate reproduction of the wake behind rotor. The rapidity of calculation, in comparison to full-geometry modelling, appears to be promising for wind farm simulations.; Un modèle amélioré de surface active est proposé pour représenter l’écoulement autour d'une éolienne. Ce modèle est développé en association avec un solveur Navier-Stokes et en utilisant une méthode d'élément de pale pour le calcul de la puissance de l’éolienne et du développement du sillage. Les pales sont remplacées par des surfaces minces...

‣ Experimental study of yawed inflow around wind turbine rotor

NOURA, Belkheir; DOBREV, Ivan; DIZENE, Rabah; MASSOUH, Fawaz; KHELLADI, Sofiane
Fonte: Institution of Mechanical Engineers Publicador: Institution of Mechanical Engineers
Português
Relevância na Pesquisa
68.974336%
In this article, we present an experimental study in a wind tunnel of a three-bladed, Rutland 503 model, horizontal axis yawed wind turbine. Power measurement and an exploration downstream wake of the turbine using particle image velocimetry measurements are performed. The variation of power coefficient as a function of rotational velocity is presented for different yaw angles. The results show a loss of power from the wind turbine when the yaw angle increases. The velocity field of the downstream wake of the rotor is presented in an azimuth plane, which passes through the symmetry axis of the rotor. The instantaneous velocity field is measured and recorded to allow for obtaining the averaged velocity field. The results also show variations in the wake downstream due to decelerating flow caused by the yawed turbine rotor. Analysis of this data shows that the active control of yaw angles could be an advantage to preserve the power from the wind turbine and that details near rotor wake are important for wake theories and topredict the performance of wind turbines as well.

‣ Determination of wind turbine far wake using actuator disk

AMER, Rodeyna; DOBREV, Ivan; MASSOUH, Fawaz
Fonte: Arts et Métiers ParisTech Publicador: Arts et Métiers ParisTech
Português
Relevância na Pesquisa
68.9401%
The growth in size of wind turbines over the last years is significant. The rotor diameter becomes somehow comparable to atmospheric boundary layer at the land surface. In this case the assumption of uniform velocity of upcoming wind cannot be valid. The aim of this paper is to create a simplified model of wind turbine rotor which can represent the aerodynamic inter-action of atmospheric boundary layer with a horizontal axis wind turbine. Such model will be also useful for the study of optimal placement of wind turbines in a wind farm when a large number of calculations is needed and when the time required for full CFD calculations be-comes prohibitive. In this study we adopt actuator disk model which takes in account with sufficient precision the influence of blade geometry on wind turbine aerodynamic performance. The proposed actuator disk model is tested in the case of horizontal axis wind turbine using wall-modelled large eddy simulation. The obtained results of aerodynamic performance and wake show the rapidity of calculation and the reliability of proposed approach.

‣ Dynamic modeling and characterization of a wind turbine system leading to controls development

Semrau, Greg
Fonte: Rochester Instituto de Tecnologia Publicador: Rochester Instituto de Tecnologia
Tipo: Tese de Doutorado
Português
Relevância na Pesquisa
68.994463%
With the growing energy demand and need to decrease greenhouse gas emissions there has been a rise in the popularity of renewable energy systems. One of the most popular renewable energy systems over the past decade has been the wind turbine. Technological advances in modeling, prediction, sensing and control combined with the current shift towards decentralized power have prompted development of wind energy systems. Decentralized distribution allows for lower transmission losses because of the closer proximity to the consumer and greater regional control. The wind turbine has positioned itself as the leading energy system to serve as a cornerstone in the development of decentralized energy distribution. This research focuses on the development of a nonlinear dynamic model of a variable speed wind turbine. The modeling effort is followed by model validation against published data. Subsequently, benchmark control problems and existing control strategies are reviewed from literature. Emphasis is placed on variable speed form of operation. Control strategies are studied for two different operating modes of a wind turbine, namely operations below and above the rated-speed. For the former case control design is based on power maximization and for the latter the control design is based on power regulation. For each case...

‣ On wind turbine model predictive pitch control: an event-based simulation approach

Melicio, Rui
Fonte: SPRINGER, Heidelberg, Germany Publicador: SPRINGER, Heidelberg, Germany
Tipo: Parte de Livro
Português
Relevância na Pesquisa
68.82603%
This paper is about a hierarchical structure with an event-based su-pervisor in a higher level and a model predictive control (MPC) in a lower level applied to a wind turbine. The event-based supervisor analyzes the operation conditions to determine the state of the wind turbine. The objectives and con-straints of the model predictive controller can also be adjusted by this supervi-sory controller. This hierarchical structure is able to ensure the performance and reliability required for a wind turbine to be integrated into an electric grid. Comparisons between model predictive pitch control and a default proportional integral pitch controller applied to a wind turbine benchmark are given and simulation results by Matlab/Simulink are shown in order to prove the effec-tiveness of the model.

‣ Supervisory control of a variable speed wind turbine with doubly fed induction generator

Melicio, Rui
Fonte: Energy Reports (ELSEVIER) Publicador: Energy Reports (ELSEVIER)
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
68.754126%
This paper is on an onshore variable speed wind turbine with doubly fed induction generator and under supervisory control. The control architecture is equipped with an event-based supervisor for the supervision level and fuzzy proportional integral or discrete adaptive linear quadratic as proposed controllers for the execution level. The supervisory control assesses the operational state of the variable speed wind turbine and sends the state to the execution level. Controllers operation are in the full load region to extract energy at full power from the wind while ensuring safety conditions required to inject the energy into the electric grid. A comparison between the simulations of the proposed controllers with the inclusion of the supervisory control on the variable speed wind turbine benchmark model is presented to assess advantages of these controls.

‣ FLOW PHYSICS OF 3-BLADED STRAIGHT CHORD H-DARRIEUS WIND TURBINE

Gupta, Rajat; Biswas, Agnimitra
Fonte: JUEE Press Publicador: JUEE Press
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 17/08/2013 Português
Relevância na Pesquisa
68.729023%
Steady-state two-dimensional Computational Fluid Dynamics (CFD) simulations were performed using Fluent 6.0 software to analyze the flow physics of 3-bladed straight chord H-Darrieus wind turbine having blade twist of 300 for 10% of its chord at the trailing ends. The flow was simulated using finite volume method coupled with moving mesh technique to solve mass and momentum conservation equations. The standard k-ε turbulence model with enhanced wall condition was used. Second-order upwind discretization scheme was adopted for pressure-velocity coupling of the flow. Flow physics of the turbine was analyzed with the help of pressure and velocity contours. It was found that velocity magnitude decreases from upstream to downstream side across the turbine, which will cause overall lift for the turbine. Further, blade twist at the trailing ends creates circulations that interact with the blades in a direction opposite to the direction of rotation of the turbine which would enhance power production for the three bladed turbine.

‣ DESIGN AND DEVELOPMENT OF A 1/3 SCALE VERTICAL AXIS WIND TURBINE FOR ELECTRICAL POWER GENERATION (doi: 10.4090/juee.2007.v1n2.053060)

Hossain, Altab Md.; Iqbal, A.K.M. Parvez; Rahman, Ataur Md.; Arifin, Muhidn; M., Mazian
Fonte: JUEE Press Publicador: JUEE Press
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 02/12/2008 Português
Relevância na Pesquisa
69.122563%
This research describes the electrical power generation in Malaysia by the measurement of wind velocity acting on the wind turbine technology. The primary purpose of the measurement over the 1/3 scaled prototype vertical axis wind turbine for the wind velocity is to predict the performance of full scaled H-type vertical axis wind turbine. The electrical power produced by the wind turbine is influenced by its two major part, wind power and belt power transmission system. The blade and the drag area system are used to determine the powers of the wind that can be converted into electric power as well as the belt power transmission system. In this study both wind power and belt power transmission system has been considered. A set of blade and drag devices have been designed for the 1/3 scaled wind turbine at the Thermal Laboratory of Faculty of Engineering, Universiti Industri Selangor (UNISEL). Test has been carried out on the wind turbine with the different wind velocities of 5.89m/s, 6.08m/s and 7.02m/s. From the experiment, the wind power has been calculated as 132.19 W, 145.40 W and 223.80 W. The maximum wind power is considered in the present study.

‣ PREDICTION OF POWER GENERATION OF SMALL SCALE VERTICAL AXIS WIND TURBINE USING FUZZY LOGIC (doi: 10.4090/juee.2009.v3n2.043051)

Hossain, Altab Md.
Fonte: JUEE Press Publicador: JUEE Press
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 23/07/2010 Português
Relevância na Pesquisa
69.23884%
Renewable energy from the wind turbine has been focused for the alternative source of power generation due to the following advances of the of the wind turbine. Firstly, the wind turbine is highly efficient and eco-friendly. Secondly, the turbine has the ability to response for the changeable power generation based on the wind velocity and structural framework. However, the competitive efficiency of the wind turbine is necessary to successfully alternate the conventional power sources. The most relevant factor which affects the overall efficiency of the wind turbine is the wind velocity and the relative turbine dimensions. Artificial intelligence systems are widely used technology that can learn from examples and are able to deal with non-linear problems. Compared with traditional approach, fuzzy logic approach is more efficient for the representation, manipulation and utilization. Therefore, the primary purpose of this work was to investigate the relationship between wind turbine power generation and wind velocity, and to illustrate how fuzzy expert system might play an important role in prediction of wind turbine power generation. The main purpose of the measurement over the small scaled prototype vertical axis wind turbine for the wind velocity is to predict the performance of full scaled H-type vertical axis wind turbine. Prediction of power generation at the different wind velocities has been tested at the Thermal Laboratory of Faculty of Engineering...

‣ High Order Recurrent Neural Control for Wind Turbine with a Permanent Magnet Synchronous Generator

Ricalde,Luis J.; Cruz,Braulio J.; Sánchez,Edgar N
Fonte: Centro de Investigación en computación, IPN Publicador: Centro de Investigación en computación, IPN
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2010 Português
Relevância na Pesquisa
68.70261%
In this paper, an adaptive recurrent neural control scheme is applied to a wind turbine with permanent magnet synchronous generator. Due to the variable behavior of wind currents, the angular speed of the generator is required at a given value in order to extract the maximum available power. In order to develop this control structure, a high order recurrent neural network is used to model the turbine-generator model which is assumed as an unknown system; a learning law is obtained using the Lyapunov methodology. Then a control law, which stabilizes the reference tracking error dynamics, is developed using Control Lyapunov Functions. Via simulations, the control scheme is applied to maximum power operating point on a small wind turbine.