Đang chuẩn bị liên kết để tải về tài liệu:
Wind Power 2011 Part 12

Tham khảo tài liệu 'wind power 2011 part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Variability of Wind and Wind Power 315 The phase difference between the spectrum of LEZG and LELO is computed to estimate the lag between the oscilations in both stations. A phase difference positive indicate that the fluctuations of f frequency are observed in average first in LEZGand then in LELO and vice vers a. The average time lag can be computed as lag phase 2fff when the phase is expressed in radians. In general slow fluctuations show a phase proportional to frequency indicating that the slow fluctuations are observed with a constant time delay between stations. A random phase indicates that the fluctuations happen first indiferently in any station without a simple temporal link. In general fast fluctuations show non-systematic phases indicating that they are local. -8.029 rad 7.2087 rad Fig. 16. Phase difference between the periodogram and spectrogram of Zaragoza airport respect the ones of Logrono airport estimated by WINDFREDOM program . 316 Wind Power 8. References 2009 28 EC of the European Parliament and of the Council of 23 April 2009 on the promotion of the use of energy from renewable sources and amending and subsequently repealing Directives 2001 77 EC and 2003 30 EC. Akhmatov V. Knudsen H. 2002 . An aggregate model of a grid-connected large scale offshore wind farm for power stability investigations-importance of windmill mechanical system. Electrical Power Systems 24 2002 709-717. Anderson C. L. Cardell J. B. 2008 Reducing the Variability of Wind Power Generation for Participation in Day Ahead Electricity Markets Proceedings of the 41st Hawaii International Conference on System Sciences - 2008. Antoniou I. Wagner R. Pedersen S.M. Paulsen U.S. Aagaard Madsen H. Jorgensen H.E. Thomsen K. Enevoldsen P. Thesbjerg L. 2007 Influence of wind characteristics on turbine performance EWEC 2007. Apt J. 2007 The spectrum of power from wind turbines Journal of Power Sources 169 pp. 369-374 Boyle G. 2007 . Renewable Electricity and the Grid. The Challenge of .