Innovation for a Reduction of the Yaw Moment on a Floating Platform With a Vertical-Axis Wind Turbine

2014 ◽  
Author(s):  
Samuel Kanner ◽  
Ronald W. Yeung
Keyword(s):  
Wind Turbine ◽  
Translational Motion ◽  
Vertical Axis ◽  
Mooring System ◽  
Vertical Axis Wind Turbine ◽  
Spar Platform ◽  
Advantages And Disadvantages ◽  
The Third ◽  
Lead Screw ◽  
Novel Design

Three designs of a floating spar platform for a vertical-axis wind turbine (VAWT) are considered, including two novel designs. The novel designs convert the rotary motion of the platform to a translational motion (namely, heave), to reduce the maximum yaw stiffness requirements of the mooring system. In typical operational conditions of a VAWT, the mooring system needs to be stiff to prevent the yaw rotation of the platform, allowing power to be taken off from the rotary electromagnetic generator. The first design considered is a simple spar platform with mooring lines in a spread-mooring configuration. The second design, a novel design, incorporates a lead-screw to couple the rotational motion to a translational motion. This design can take advantage of the hydrostatic restoring force present in heave to reduce the mooring stiffness. The third design, also a novel design, uses a spar-torus combination platform and a lead-screw to counteract the torque on the stator of the generator. Numerical models in the time domain are developed to simulate the dynamics of these three platforms in regular waves and constant-wind conditions and the results are reported. It was found that the stiffness requirements of the second design can be reduced by 25% without changing the transient dynamics. If the wave climate is energetic enough, the third design can not only reduce the yaw stiffness requirements but also increase the mean power produced. Advantages and disadvantages of each design due to the relative complexity of each system, as well as the mooring, generator, and platform dynamics are discussed.

scholarly journals Modelo Teórico de los Sistemas de Aerogeneración Eléctrica para las Turbinas Eólicas de Eje Vertical

2019 ◽  
pp. 68-76
Keyword(s):  
Theoretical Model ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Magnetic Induction ◽  
Magnetic Levitation ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine ◽  
Horizontal Axis Wind Turbine ◽  
Advantages And Disadvantages ◽  
Levitation System

Modelo Teórico de los Sistemas de Aerogeneración Eléctrica para las Turbinas Eólicas de Eje Vertical Theoretical Model of Electric Aerogeneration Systems for Vertical Axis Wind Turbines Anthony Pinedo, Guillermo Ramírez, Lincoln Chiguala, Juan Estrada, David Asmat, Renny Nazario, Daniel Delfín, Lourdes Noriega, Silvia Aguilar, Randy Rosas, Luisa Juárez DOI: https://doi.org/10.33017/RevECIPeru2009.0027/ RESUMEN Existen dos tipos de sistemas de aerogeneración eléctrica por turbinas eólicas, los llamados de eje horizontal (HAWT) y los de eje vertical (VAWT). Ambos proponen ventajas y desventajas, dependiendo de muchos factores. Pero en general, no fue hasta hace unos años que el segundo tipo había sido ignorado, debido a la poca potencia que producía en comparación con los HAWT. Pero con la adaptación de un sistema de levitación, y un nuevo sistema de inducción magnética, las VAWT, lograron incrementar notablemente la energía obtenida, llegando incluso a superar a los HAWT. A pesar que los modelos VAWT han sido harto estudiados en cuanto al esquema experimental y de diseño, no se formuló ninguna explicación sólida, partiendo de principios básicos, sobre el funcionamiento de los VAWT. En este trabajo, se propone un modelo teórico del funcionamiento de los mismos. Para ello, se realizan tres estudios: la interacción del viento con las aspas del aerogenerador, el sistema de levitación magnética y la producción de energía eléctrica por inducción magnética. Estos tres fenómenos, permiten definir y predecir el funcionamiento de tal sistema de aerogeneración. Además, permite «visualizar» la influencia de los diferentes parámetros sobre la eficiencia del sistema, y así pues, poder manejar, los parámetros que controlamos experimentalmente, para obtener una eficiencia óptima. Palabras clave: aerogeneración eléctrica, turbinas de aire, eje vertical, levitación magnética. ABSTRACT There are two types of systems of electric aerogeneration by using wind turbines, one is called horizontal axis wind turbine (HAWT) and the other one is called vertical axis wind turbine (VAWT). Both of them have advantages and disadvantages depending on many factors. Since the second one had produced lees power than the first one, they were ignored. However, the adaptation of a levitation system and a new system of magnetic induction made VAWT increase the power produced and exceed the HAWT. Although VAWT models were studied enough in the design and experimental scheme, there is no solid explanation, based on basic principles, on the operation of the VAWT. In this paper is proposed a theoretical model of VAWT operation. Therefore, three studies are done: the interaction between wind and blades of the turbine, the magnetic levitation system and the energy production by magnetic induction. Those studies make us able to know and predict the operation of those systems. Since, we shall know how many factors are affecting the efficiency of the system; we shall be able to control those parameters in order to get the best efficiency. Keywords: electric aerogeneration, vertical axis wind turbine, magnetic levitation.

scholarly journals Mooring System Design and Verification for a Floating Vertical Axis Wind Turbine

2020 ◽  
Vol 11 (03) ◽  
pp. 2050003
Author(s):  
Fausto Raschioni ◽  
Roberto Longo ◽  
Ali Mehmanparast ◽  
Cesare Mario Rizzo
Keyword(s):  
Wind Turbine ◽  
Limit State ◽  
Vertical Axis ◽  
Future Application ◽  
Ultimate Limit State ◽  
Mooring System ◽  
Vertical Axis Wind Turbine ◽  
Floating Wind Turbine ◽  
Crucial Part ◽  
Ultimate Limit

The aim of this study is to investigate the technical feasibility of an innovative vertical axis floating wind turbine concept with the main focus on the design and verification of the mooring system. The study is developed through iterative processes in order to identify the optimum design for the new floating wind turbine concept. The Ultimate Limit State (ULS) criteria have been considered to verify the integrity of the mooring system in the extreme environmental conditions with a 50-year return period. For this purpose, time domain dynamic analysis has been performed using the commercial software OrcaFlex [Orcina website, OrcaFlex software, https://www.orcina.com/ ]. Although the analysis is carried out for a specific site deemed suitable for the project, the results can be used as an input for any future application in other locations. The present study is intended to be a proof of concept with a proposed scientific framework for optimization of the mooring system which is considered to be a crucial part in the design of floating wind turbines due to their complex dynamic behavior.

The Development of the Efficiency Enhancement Mechanism of the Vertical Axis Wind Turbine

2012 ◽  
Vol 499 ◽  
pp. 336-341
Author(s):  
Qi Yao ◽  
Ying Xue Yao ◽  
Liang Zhou ◽  
Zhi Peng Tang
Keyword(s):  
Wind Turbine ◽  
Clean Energy ◽  
Vertical Axis ◽  
Efficiency Enhancement ◽  
Vertical Axis Wind Turbine ◽  
Horizontal Axis Wind Turbine ◽  
Advantages And Disadvantages ◽  
Energy Issue ◽  
New Energy ◽  
Wind Power System

The energy issue has been the focus of world’s attention. Wind plays a crucial role in the development and application of new energy as a renewable and clean energy. Wind turbine is the core component of the wind power system. It usually can be divided into horizontal axis wind turbine (HAWT) and vertical axis wind turbine (VAWT) by the relative position of the spindle and the ground. This paper analyzes the advantages and disadvantages of VAWT and summarizes the improvement of the VAWT from the energy congregating technology and self-starting technology which can provide technical support for the research of VAWT in the future.

scholarly journals The Parameters Affect on Power Coefficient Vertical Axis Wind Turbine

2012 ◽  
Vol 13 (1) ◽  
Author(s):  
Ahmed Y. Qasim ◽  
Ryspek Usubamatov ◽  
Zuraidah M. Zain ◽  
Ghulam Abdul Quad
Keyword(s):  
Drag Coefficient ◽  
Wind Turbine ◽  
Vertical Axis ◽  
Power Coefficient ◽  
The Novel ◽  
Vertical Axis Wind Turbine ◽  
Four Frames ◽  
Different Types ◽  
Variable Wind ◽  
Novel Design

ABSTRACT: This study describes the design of a special type of vertical axis rotor wind turbine with moveable vertically positioned vanes. The novel design increases the torque in the left side of the wind turbine by increasing the drag coefficient. It also reduces the negative torque of the frame which rotates contrary to the wind in the other side. Two different types of models, having different vane shapes (flat vane and cavity shaped vane), were fabricated. Each type consisted of two models with varying number of frames (three and four frames). The models were tested in a wind tunnel with variable wind speed in order to understand the effect of shape, weight, and number of frames on the power coefficient of the wind turbine. ABSTRAK: Di dalam kajian ini, rotor turbin angin berpaksi vertikel sebagai rangka khusus telah direkabentuk dengan lokasi vertikel mudahalih oleh bilah kipas. Rekabentuk ini meningkatkan tork di bahagian kiri turbin angin dengan meningkatkan pekali seretan dan mengurangkan tork negatif rangka yang berputar berlawanan dengan angin pada bahagian lain. Dua jenis model berbentuk berlainan telah difabrikasi (bilah kipas rata dan bilah kipas berbentuk kaviti), dengan setiap jenis mempunyai dua model dengan bilangan rangka yang berlainan (berangka tiga dan berangka empat). Model-model telah diuji di dalam terowong angin dengan kelajuan angin yang berbeza bagi mendapatkan kesan rekabentuk, berat dan bilangan rangka ke atas pekali kuasa.KEYWORDS: design; wind turbine; drag coefficient; vane

Conceptual Design of a Floating Support Structure and Mooring System for a Vertical Axis Wind Turbine

2012 ◽  
Author(s):  
Petter Andreas Berthelsen ◽  
Ivar Fylling ◽  
Luca Vita ◽  
Uwe S. Paulsen
Keyword(s):  
Wind Turbine ◽  
Conceptual Design ◽  
Optimization Problems ◽  
Vertical Axis ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Response Analysis ◽  
Mooring System ◽  
Vertical Axis Wind Turbine ◽  
Support Structure

This paper deals with the conceptual design of a floating support structure and mooring system for a 5MW vertical axis offshore wind turbine. The work is carried out as part of the DeepWind project, where the main objective is to investigate the feasibility of a floating vertical axis offshore wind turbine. The DeepWind concept consists of a Darrieus rotor mounted on a spar buoy support structure. The conceptual design is carried out in an iterative process, involving the different subcomponents. The present work is part of the first design iteration and the objective is to find a feasible floating support structure and mooring system for the DeepWind concept. The conceptual design is formulated as an optimization problem: Starting with an initial configuration, the optimization procedure tries to find a cheaper solution while satisfying a set of design requirements. This approach utilizes available response analysis programs for mooring system forces and vessel motions, and combines this with a gradient search method for solution of nonlinear optimization problems with arbitrary constraints. Two different mooring system configurations are considered: Chain systems with 3 and 6 lines, respectively.

Calculating the aerodynamics of vertical axis wind turbines

2012 ◽  
Vol 34 (3) ◽  
pp. 169-184 ◽  
Author(s):  
Hoang Thi Bich Ngoc
Keyword(s):  
Wind Turbine ◽  
Incidence Angle ◽  
Vertical Axis ◽  
Rotor Blades ◽  
Vertical Axis Wind Turbine ◽  
Horizontal Axis Wind Turbine ◽  
Velocity Triangle ◽  
Relationship Of ◽  
The Relationship

Vertical axis wind turbine technology has been applied last years, very long after horizontal axis wind turbine technology. Aerodynamic problems of vertical axis wind machines are discussible. An important problem is the determination of the incidence law in the interaction between wind and rotor blades. The focus of the work is to establish equations of the incidence depending on the blade azimuth, and to solve them. From these results, aerodynamic torques and power can be calculated. The incidence angle is a parameter of velocity triangle, and both the factors depend not only on the blade azimuth but also on the ratio of rotational speed and horizontal speed. The built computational program allows theoretically selecting the relationship of geometric parameters of wind turbine in accordance with requirements on power, wind speed and installation conditions.

Design and Analysis of Vertical Axis Wind Turbine

2017 ◽  
Author(s):  
Prof. R.K. Bhoyar ◽  
Prof. S.J. Bhadang ◽  
Prof. N.Z. Adakane ◽  
Prof. N.D. Pachkawade
Keyword(s):  
Wind Turbine ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine
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