contrasting electricity demand with wind power supply case study in hungary电力需求与供应风力发电对比案例研究在匈牙利.pdfVIP

Energies 2009, 2, 839-850; doi:10.3390/e OPEN ACCESS energies ISSN 1996-1073 /journal/energies Article Contrasting Electricity Demand with Wind Power Supply: Case Study in Hungary ´ ´ ´ ´ Peter Kiss , Laszlo Varga and Imre M. Janosi ´ ¨ ¨ ´ ´ Department of Physics of Complex Systems, Lorand Eotvos University, Pazmany P. s. 1/A, H-1117 Budapest, Hungary ´ ´ E.ON Hungaria Ltd., Roosevelt ter 7-8, H-1051 Budapest, Hungary Author to whom correspondence should be addressed; E-Mail: janosi@lecso.elte.hu; Tel.: +36-1-3722878. Received: 25 August 2009 / Accepted: 27 September 2009 / Published: 30 September 2009 Abstract: We compare the demand of a large electricity consumer with supply given by wind farms installed at two distant geographic locations. Obviously such situation is rather unre- alistic, however our main goal is a quantitative characterization of the intermittency of wind electricity. The consumption pattern consists of marked daily and weekly cycles interrupted by periods of holidays. In contrast, wind electricity production has neither short-time nor seasonal periodicities. We show that wind power integration over a restricted area cannot pro- vide a stable baseload supply, independently of the excess capacity. Further essential result is that the statistics are almost identical for a weekly periodic pattern of consumption and a constant load