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Wind energy |
| [69] | A novel approach for wind tunnel modelling of transmission lines | | Loredo-Souza AM and Davenport AG. 2001 | Although sophisticated theoretical models of the aerodynamic behaviour of transmission lines have been developed, and partially adopted in codes, they have been very difficult to verify. In this paper, the effect of turbulence scale on the behaviour of transmission line cables has been examined through wind tunnel tests and the comparison of wind tunnel tests with theoretical predictions made through statistical method using influence lines. Consistency with theory allowed the development of a new modelling approach to conductor systems using a distorted horizontal length scale (span wise) to accommodate these systems in the wind tunnel. Transverse and oblique wind incidences were tested. The results indicated that the new modelling approach to conductor systems in wind tunnels is a valid technique. It is necessary, however, that a correction be made in the values of the variance of the response measured in the distorted model.
(5 figures, 4 tables, 15 references) | | Journal of Wind Engineering and Industrial Aerodynamics89(11–12):1017–1029 | Laboratorio de Aerodinamica das Construgoes,
Departmento de Engenharia Civil, Universidade Federal do Rio Grande do Sul, Av. Osvaldo Aranha, 99/305 Porto Alegre, RS 90035–190, Brazil
<lac@genesis.cpgec.ufrgs.br> | | | [70] | Grid power quality with variable speed wind turbines | | Chen Z and Spooner E. 2001 | Grid connection of renewable energy sources is essential if they are to be effectively exploited, but grid connection brings problems of voltage fluctuation and harmonic distortion. In this paper, appropriate modelling and simulation techniques are discussed for studying the voltage fluctuation and harmonic distortion in a network to which variable speed wind turbines are connected. Case studies on a distribution network show that the voltage fluctuation and harmonic problems can be minimized with the proposed power electronics interface and control system while the wind energy conversion system captures the maximum power from the wind as wind speed varies. The studies have also demonstrated the ability of the advanced converter to assist the system voltage regulation.
(22 figures, 12 references) | | IEEE Transactions on Energy Conversion16(2):148–153 | Department of Electronic and Electrical Engineering,
De Montfort University, The Gateway, Leicester, LEI 9BH, UK | | | [71] | Phase-wound induction generators with slip power recovery scheme for optimal matching of rotor speed of a wind-turbine | | Majumder TK and Sanyal AN. 2001 | Slip power recovery schemes are widely in use for adjustable speed induction motor drives operating on constant frequency supply. The technique may be used in the reverse mode to enable asynchronous generation while the rotor speed varies over a wide range. This is the case for wind-driven turbogenerators with fixed pitch angle if maximum possible power is to be extracted from the wind-stream. Normal synchronous or asynchronous generators are not suited to variable speed operation while they are connected to utility grids. The paper presents a scheme for optimizing the extracted power by the use of variable slip induction generator with slip power recovery scheme.
(2 figures, 4 references) | | Indian Journal of Power and River Valley Development51(9 and 10):189–191 | Electrical Engineering Wing,
Department of Telecommunications, Kolkata, India | | | [72] | Optimal wind-hydro solution for Aegean Sea islands' electricity-demand fulfillment | | Kaldellis JK and Kavadias KA. 2001 | Aegean Sea islands possess an outstanding wind potential. However, the stochastic behaviour of wind speed leads to significant disharmony between wind energy production and electricity demand. A combined wind-hydro energy production station is found to be a vital solution for all these islands. In this paper, a methodology of optimal wind-hydro solution estimation is developed and subsequently applied to several typical Aegean Sea island cases, in order to define the most beneficial configuration of the proposed renewable station. All numerical calculations are based on real data, like long-term wind speed measurements, demand electrical load, and operational characteristics of the system components. In all the cases analysed, the renewable energy sources penetration exceeds 85%, while a significant part of the systems' wind energy surplus is forwarded to a desalination plant for clean-water production.
(14 figures, 4 tables, 27 references) | | Applied Energy70(4):333–354 | Laboratory of Soft Energy Applications and Environmental Protection,
Mechanical Engineering Department, TEI Piraeus, Pontou 58, Hellinco 16777, Greece
<jkald@teipir.gr> | |
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