| 摘要 |
<p>PCT No. PCT/DK82/00037 Sec. 371 Date Dec. 27, 1983 Sec. 102(e) Date Dec. 27, 1983 PCT Filed Apr. 29, 1982 PCT Pub. No. WO82/03952 PCT Pub. Date Nov. 11, 1982.Coupling of the asynchronous machine to the AC mains is effected in the way that the contacts arranged for the purpose are closed when the voltage across them before coupling is at a maximum. Coupling can be done by several stages, from two and upwards. The coupling device, which primarily aims at coupling of windmill generators, has the effect that because of the precise coupling relative to the maxima of the voltages, the DC link in the current will be negligible, with the result that the transient torques will become insignificant. In this way, it is avoided that coupling will cause the rotary system of the windmill to oscillate. The lack of DC will also result in small voltage drops in the mains. If the windmill has no transformer of its own, the current surges can be dampened further by effecting coupling over impedances which are cut out stepwise at voltage maxima over these.</p> |
