US Patent No: 8,198,742

Number of patents in Portfolio can not be more than 2000

Variable speed wind turbine with a doubly-fed induction generator and rotor and grid inverters that use scalar controls

ALSO PUBLISHED AS: 20090206606
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Abstract

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The present invention relates to an improved wind turbine, of the type which employs doubly fed induction generators (DFIG), and a wind park including the same, which permits the use of lighter weight turbines, with the ability to have greater energy capture, more precise control of asymmetrical phases and enhanced maintenance and support of the grid during fault conditions.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
VESTAS WIND SYSTEMS A/SRANDERS SV, DK314

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Helle, Lars Aalborg, DK 42 273
Jørgensen, Allan Holm - 5 21
Schaier, Leonard - 6 33

Cited Art Landscape

Patent Info (Count) # Cites Year
 
VESTAS WIND SYSTEMS A/S (2)
7,966,103 Apparatus and method for operating a wind turbine under low utility grid voltage conditions 7 2008
8,049,352 Apparatus and method for controlling the reactive power from a cluster of wind turbines connected to a utility grid 4 2008
 
KOREAN ELECTRO TECHNOLOGY RESEARCH INSTITUTE, A CORPORATION ORGANIZED UNDER LAWS OF THE REPUBLIC OF KOREA (1)
7,638,983 Controller of doubly-fed induction generator 9 2007
 
MITSUBISHI HEAVY INDUSTRIES, LTD. (1)
7,728,452 Wind power generator system and control method of the same 13 2007
 
OREGON STATE UNIVERSITY (1)
5,239,251 Brushless doubly-fed motor control system 57 1991

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
VESTAS WIND SYSTEMS A/S (2)
8,615,331 Method and apparatus for controlling the feed of reactive power in a wind power generation system 0 2009
8,395,360 Direct power and stator flux vector control of a generator for wind energy conversion system 5 2011
 
GENERAL ELECTRIC COMPANY (1)
8,664,788 Method and systems for operating a wind turbine using dynamic braking in response to a grid event 1 2012
 
NORDEX ENERGY GMBH (1)
8,618,685 Method for operating a wind turbine in the event of a grid error and a wind turbine for carrying out said method 0 2012
 
ROCKWELL AUTOMATION TECHNOLOGIES, INC. (1)
8,432,052 Wind power converter system with grid side reactive power control 0 2010
 
ROLLS-ROYCE CORPORATION (1)
8,786,262 Systems and methods for synchronous power generation 0 2011
 
THE ROYAL INSTITUTION FOR THE ADVANCEMENT OF LEARNING/MCGILL UNIVERSITY (1)
8,476,871 Method and system for controlling a doubly-fed induction machine 2 2007
 
WOODWARD KEMPEN GMBH (1)
8,400,004 Method for operating a wind turbine 0 2009

Maintenance Fees

Fee Large entity fee small entity fee micro entity fee due date
3.5 Year Payment $1600.00 $800.00 $400.00 Dec 12, 2015
7.5 Year Payment $3600.00 $1800.00 $900.00 Dec 12, 2019
11.5 Year Payment $7400.00 $3700.00 $1850.00 Dec 12, 2023
Fee Large entity fee small entity fee micro entity fee
Surcharge - 3.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge - 7.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge - 11.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge after expiration - Late payment is unavoidable $700.00 $350.00 $175.00
Surcharge after expiration - Late payment is unintentional $1,640.00 $820.00 $410.00

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