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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Variable speed wind turbine ： ウィキペディア英語版 Variable speed wind turbine Original models of wind turbines were fixed speed turbines; that is, the rotor speed was a constant for all wind speeds. The tip-speed ratio for a wind turbine is given by the following formula: $$ \lambda = \frac where $\backslash omega$ is the rotor speed (in radians per second), $R$ is the length of a blade, and $v$ is the wind speed. That is to say, for a fixed-speed wind turbine, the value of the tip-speed ratio is only changed by wind speed variations. In reference to a $C\_p$-$\backslash lambda$ graph, which illustrates the relationship between Tip-speed ratio and efficiency, it is evident that only one value of $\backslash lambda$ yields the highest efficiency. That is, the fixed speed wind turbine is not operating at peak efficiency across a range of wind speeds. This was a motivator for the development of variable speed wind turbines. == Background == All wind turbines that generated electricity were variable speed before 1939.〔 All grid-connected wind turbines, from the first one in 1939 until the development of variable-speed grid-connected wind turbines in the 1970s, were fixed-speed wind turbines. As of 2003, nearly all grid-connected wind turbines operate at exactly constant speed (synchronous generators) or within a few percent of constant speed (induction generators).〔 P. W. Carlin, A. S. Laxson, and E. B. Muljadi. ("The History and State of the Art of Variable-Speed wind Turbine Technology" ). 2003. p. 130-131. 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Variable speed wind turbine」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.