Prime-mover dynamo plants – Electric control – Fluid-current motors
Reexamination Certificate
2006-05-09
2006-05-09
Schuberg, Darren (Department: 2834)
Prime-mover dynamo plants
Electric control
Fluid-current motors
C290S055000, C290S04000F
Reexamination Certificate
active
07042110
ABSTRACT:
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.
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Cousineau Kevin L.
Erdman William
Holley William
Howes Lawrence H.
Mikhail Amir S.
Clipper Windpower Technology, Inc.
Cuevas Pedro J.
Lamb Owen L.
Schuberg Darren
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