29 Apr '13, 1pm

The impact of variable speed concepts on wind power: Between 1995 and 2004, there was a revolution in wind tur...

Note: this article first appeared in Renewable Energy Focus March/April 2013. Click here for a free signup . Introduction - Executive Summary Between 1995 and 2004, there was a revolution in wind turbine design in which variable-speed, pitch-controlled (VSPC) machines outcompeted the early fixed-speed, stall-controlled (FSSC) machines in the marketplace, rising from 14% to 73% market share. The variable speed concept was invented simultaneously on both sides of the Atlantic, giving the impression that the “selfish invention” was just an idea whose time had come. The new machines succeeded (despite early setbacks), providing up to 10% greater energy capture and more grid-friendly operation. Moreover, the reduced loads at/near rated power reduced the structural materials required (eg. tower), enabling the enormous scale-up that occurred in the industry in this period, from a...

Full article: http://www.renewableenergyfocus.com/view/32093/the-impact...

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