1
William L Erdman: Variable speed wind turbine with reduced power fluctuation and a static VAR mode of operation. U S Windpower, Blakely Sokoloff Taylor & Zafman, July 6, 1993: US05225712 (218 worldwide citation)

A wind turbine power converter is disclosed herein that smooths the output power from a variable speed wind turbine, to reduce or eliminate substantial power fluctuations on the output line. The power converter has an AC-to-DC converter connected to a variable speed generator that converts wind ener ...


2
Robert D Richardson, William L Erdman: Variable speed wind turbine. U S Windpower, Blakely Sokoloff Taylor & Zafman, January 21, 1992: US05083039 (201 worldwide citation)

A variable speed wind turbine is disclosed comprising a turbine rotor that drives an AC induction generator, a power converter that converts the generator output to fixed-frequency AC power, a generator controller, and an inverter controller. The generator controller uses field orientation to regula ...


3
Amir S Mikhail, Craig L Christenson, Kevin L Cousineau, William L Erdman, William E Holley: Variable speed wind turbine generator. Zond Energy Systems, Blakely Sokoloff Taylor & Zafman, October 24, 2000: US06137187 (117 worldwide citation)

A variable speed system for use in systems, such as, for example, wind turbines, is described. The system comprises a wound rotor induction generator, a torque controller and a proportional, integral derivative (PID) pitch controller. The torque controller controls generator torque using field orien ...


4
Amir S Mikhail, Craig L Christenson, Kevin L Cousineau, William L Erdman, William E Holley: Variable speed wind turbine generator. Zond Energy Systems, Blakely Sokoloff Taylor & Zafman, July 16, 2002: US06420795 (86 worldwide citation)

A variable speed system for use in systems, such as, for example, wind turbines, is described. The system comprises a wound rotor induction generator, a torque controller and a proportional, integral derivative (PID) pitch controller. The torque controller controls generator torque using field orien ...


5
Robert D Richardson, William L Erdman: Four quadrant motor controller minimizing distortion index. Kenetech Windpower, Blakely Sokoloff Taylor & Zafman, December 17, 1996: US05585708 (70 worldwide citation)

A motor control apparatus and method is disclosed for controlling a multiphase AC motor by controlling electrical quantities such as voltage or current applied to the stator of the motor. The apparatus includes a motor command unit for defining a reference signal indicative of a desired motor parame ...


6
Amir S Mikhail, Craig L Christenson, Kevin L Cousineau, William L Erdman, William E Holley: Variable speed wind turbine generator. General Electric Company, Blakely Sokoloff Taylor & Zafman, February 15, 2005: US06856039 (69 worldwide citation)

A variable speed system for use in systems, such as, for example, wind turbines, is described. The system comprises a wound rotor induction generator, a torque controller and a proportional, integral derivative (PID) pitch controller. The torque controller controls generator torque using field orien ...


7
Amir S Mikhail, Craig L Christenson, Kevin L Cousineau, William L Erdman, William E Holley: Variable speed wind turbine generator. General Electric Company, Blakely Sokoloff Taylor & Zafman, August 22, 2006: US07095131 (63 worldwide citation)

A variable speed system for use in systems, such as, for example, wind turbines, is described. The system comprises a wound rotor induction generator, a torque controller and a proportional, integral derivative (PID) pitch controller. The torque controller controls generator torque using field orien ...


8
David Deam, William L Erdman: Low impedance bus for power electronics. U S Windpower, Blakely Sokoloff Taylor & Zafman, December 15, 1992: US05172310 (60 worldwide citation)

A low impedance, high power bus for conduction of electrical power with reduced transient signal effects is described herein. The high power bus can be applied as a high power supply bus between a constant voltage source and a plurality of switching cells positioning at varying locations along the b ...


9
William L Erdman: Controlled electrical energy storage apparatus for utility grids. KENETECH Windpower, Blakely Sokoloff Taylor & Zafman, November 29, 1994: US05369353 (58 worldwide citation)

A controlled electrical energy storage apparatus for selectively storing electrical energy from an electrical grid, and selectively releasing the electric energy back into the grid. The apparatus includes a converter coupled to the grid, and a DC energy storage device coupled to the converter. The c ...


10
William L Erdman, Terry M Lettenmaier: Wind farm electrical system. Global EnergyConcepts, William Erdman, John Vanden Bosche, July 4, 2006: US07071579 (56 worldwide citation)

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 ...



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