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 (227 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 (215 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
Lior David: Improved wind turbine transmission.. Ashot Ashkelon, January 25, 1995: EP0635639-A1 (185 worldwide citation)

Wind turbine transmission apparatus (8) including at least one planetary transmission stage, operative for providing a continuously variable transmission ratio between a rotational input from a wind-rotor and a rotational output to an electric generator. The variable transmission ratio preferably va ...


4
Per Anders Kristian Lof, Lars Gustaf Ingolf Gertmar, Lars Anders Tommy Andren: System, method and computer program product for enhancing commercial value of electrical power produced from a renewable energy power production facility. ABB, Oblon Spivak McClelland Maier & Neustadt P C, January 28, 2003: US06512966 (175 worldwide citation)

A method, system and computer program product enhance the commercial value of electrical power produced from a wind turbine production facility. Features include the use of a premier power conversion device that provides an alternative source of power for supplementing an output power of the wind tu ...


5
Anders V Rebsdorf, Lars Helle: Variable speed wind turbine having a matrix converter. Vestas Wind Systems R&D, Finnegan Henderson Farabow Garrett & Dunner, May 20, 2003: US06566764 (139 worldwide citation)

A variable speed wind turbine is disclosed comprising a turbine rotor that drives a doubly-fed induction generator, a matrix converter which converts variable frequency output into constant frequency output, and a control unit and a protection circuit for the matrix converter. Power is circulated in ...


6
Amir S Mikhail, Kevin L Cousineau, Lawrence H Howes, William Erdman, William Holley: Variable speed distributed drive train wind turbine system. Clipper Windpower Technology, Owen L Lamb, May 9, 2006: US07042110 (129 worldwide citation)

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 ...


7
Phyllis R Heronemus: Offshore wind turbine with multiple wind rotors and floating system. Ocean Wind Energy Systems, July 11, 2006: US07075189 (126 worldwide citation)

A wind energy conversion system optimized for offshore application. Each wind turbine includes a semi-submersible hull with ballast weight that is moveable to increase the system's stability. Each wind turbine has an array of rotors distributed on a tower to distribute weight and loads and to improv ...


8
Robert E Donham, Richard L Heimbold: Wind turbine. Lockheed Corporation, Frederic P Smith, October 27, 1981: US04297076 (126 worldwide citation)

An improved wind turbine in which the tip portions of the blades are variable in pitch and are cyclically varied in pitch to control the yaw of the rotor and to relieve bending moments on the blades and are collectively varied in pitch to relieve bending moments on the blades and to maximize the pow ...


9
Eduard Muljadi: Variable speed wind turbine generator with zero-sequence filter. Midwest Research Institute, Ken Richardson, August 25, 1998: US05798632 (121 worldwide citation)

A variable speed wind turbine generator system to convert mechanical power into electrical power or energy and to recover the electrical power or energy in the form of three phase alternating current and return the power or energy to a utility or other load with single phase sinusoidal waveform at s ...


10
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 (119 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 ...