Wind farm electrical system
Abstract
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 wind turbine falls short of utility standards, but the aggregated output at the point of common coupling is within acceptable tolerances for utility power quality. The approach for aggregating low pulse number electrical output from multiple wind turbines relies upon a pad mounted transformer at each wind turbine that performs phase multiplication on the output of each wind turbine. Phase multiplication converts a modified square wave from the wind turbine into a 6 pulse output. Phase shifting of the 6 pulse output from each wind turbine allows the aggregated output of multiple wind turbines to be a 24 pulse approximation of a sine wave. Additional filtering and VAR control is embedded within the wind farm to take advantage of the wind farm's electrical impedence characteristics to further enhance power quality at the point of common coupling.
- Inventors:
- Issue Date:
- Research Org.:
- Global EnergyConcepts,LLC, Kirkland, WA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1175817
- Patent Number(s):
- 7071579
- Application Number:
- 10/458,588
- Assignee:
- Global EnergyConcepts,LLC (Kirkland, WA)
- Patent Classifications (CPCs):
-
F - MECHANICAL ENGINEERING F03 - MACHINES OR ENGINES FOR LIQUIDS F03D - WIND MOTORS
F - MECHANICAL ENGINEERING F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04 F05B - INDEXING SCHEME RELATING TO MACHINES OR ENGINES OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, TO WIND MOTORS, TO NON-POSITIVE DISPLACEMENT PUMPS, AND TO GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 17 WIND ENERGY
Citation Formats
Erdman, William L., and Lettenmaier, Terry M. Wind farm electrical system. United States: N. p., 2006.
Web.
Erdman, William L., & Lettenmaier, Terry M. Wind farm electrical system. United States.
Erdman, William L., and Lettenmaier, Terry M. Tue .
"Wind farm electrical system". United States. https://www.osti.gov/servlets/purl/1175817.
@article{osti_1175817,
title = {Wind farm electrical system},
author = {Erdman, William L. and Lettenmaier, Terry M.},
abstractNote = {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 wind turbine falls short of utility standards, but the aggregated output at the point of common coupling is within acceptable tolerances for utility power quality. The approach for aggregating low pulse number electrical output from multiple wind turbines relies upon a pad mounted transformer at each wind turbine that performs phase multiplication on the output of each wind turbine. Phase multiplication converts a modified square wave from the wind turbine into a 6 pulse output. Phase shifting of the 6 pulse output from each wind turbine allows the aggregated output of multiple wind turbines to be a 24 pulse approximation of a sine wave. Additional filtering and VAR control is embedded within the wind farm to take advantage of the wind farm's electrical impedence characteristics to further enhance power quality at the point of common coupling.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jul 04 00:00:00 EDT 2006},
month = {Tue Jul 04 00:00:00 EDT 2006}
}
Works referenced in this record:
The statistical smoothing of power delivered to utilities by multiple wind turbines
journal, January 1992
- McNerney, G.; Richardson, R.
- IEEE Transactions on Energy Conversion, Vol. 7, Issue 4