07071579 is referenced by 57 patents and cites 14 patents.

An approach to wind farm design using variable speed wind turbines with low pulse number electrical output. The output of multiple wind turbines are aggregated to create a high pulse number electrical output at a point of common coupling with a utility grid network. Power quality at each individual wind turbine falls short of utility standards, but the aggregated output at the point of common coupling is within acceptable tolerances for utility power quality. The approach for aggregating low pulse number electrical output from multiple wind turbines relies upon a pad mounted transformer at each wind turbine that performs phase multiplication on the output of each wind turbine. Phase multiplication converts a modified square wave from the wind turbine into a 6 pulse output. Phase shifting of the 6 pulse output from each wind turbine allows the aggregated output of multiple wind turbines to be a 24 pulse approximation of a sine wave. Additional filtering and VAR control is embedded within the wind farm to take advantage of the wind farm's electrical impedence characteristics to further enhance power quality at the point of common coupling.

Title
Wind farm electrical system
Application Number
10/458588
Publication Number
7071579 (B2)
Application Date
June 9, 2003
Publication Date
July 4, 2006
Inventor
Terry M Lettenmaier
Seattle
WA, US
William L Erdman
Orinda
CA, US
Agent
John Vanden Bosche
Assignee
William Erdman
CA, US
Global EnergyConcepts
WA, US
IPC
H02P 9/04
F03D 9/00
View Original Source