07042110 is referenced by 127 patents and cites 62 patents.

A variable speed wind turbine employing a rotor connected to a multiplicity of synchronous generators with wound field or permanent magnet rotors. A passive rectifier and an inverter are used for power transfer back to the grid. A Turbine Control Unit (TCU) commands a required generator torque based on rotor speed and power output of the turbine inverters. Torque is controlled by regulating the DC current by control of the inverter. A main-shaft-damping filter is provided by measurement of the DC bus voltage. In high winds the turbine remains at a constant average output power through a constant torque command and a varying pitch command to a rotor pitch servo system. A set point is fixed at the inverter output such that output VAR load is minimized running the turbine at very nearly unity power factor. Dynamic VAR and power factor control is provided by a separate VAR apparatus.

Title
Variable speed distributed drive train wind turbine system
Application Number
10/773851
Publication Number
7042110 (B2)
Application Date
February 4, 2004
Publication Date
May 9, 2006
Inventor
William Holley
Pleasanton
CA, US
William Erdman
Orinda
CA, US
Lawrence H Howes
Santa Barbara
CA, US
Kevin L Cousineau
Lompoc
CA, US
Amir S Mikhail
Santa Barbara
CA, US
Agent
Owen L Lamb
Assignee
Clipper Windpower Technology
CA, US
IPC
H02J 3/00
G05D 11/00
F03D 9/00
F03D 7/00
H02P 9/00
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