Unintended Stalling of the USW 56-100 During Optimum Pitch Control Operation

[+] Author and Article Information
G. McNerney

McNerney Consulting Services, Pleasanton, CA 94598

J. Sol. Energy Eng 116(3), 153-157 (Aug 01, 1994) (5 pages) doi:10.1115/1.2930075 History: Received January 01, 1994; Revised May 01, 1994; Online June 06, 2008


The U.S. Windpower 56-100 is a three-bladed, free yaw wind turbine, using full span blade pitch control for power regulation. It is theoretically possible to increase the energy capture of the 56-100 by adjusting the blade angle to the optimum pitch angle on a continuing basis at below rated speeds. This concept was field tested on the 56-100, but it was found that the optimum pitch control logic opens a pathway for the 56-100 to fall into stall operation when the winds are above the rated wind speed. The 56-100 then operates as a stall-regulated wind turbine with an overall reduction of energy capture and an increase in system loads.

Copyright © 1994 by The American Society of Mechanical Engineers
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