Variable Speed Wind Turbine Generator with Zero-sequence Filter
Abstract
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 sixty (60) hertz and unity power factor includes an excitation controller for generating three phase commanded current, a generator, and a zero sequence filter. Each commanded current signal includes two components: a positive sequence variable frequency current signal to provide the balanced three phase excitation currents required in the stator windings of the generator to generate the rotating magnetic field needed to recover an optimum level of real power from the generator; and a zero frequency sixty (60) hertz current signal to allow the real power generated by the generator to be supplied to the utility. The positive sequence current signals are balanced three phase signals and are prevented from entering the utility by the zero sequence filter. The zero sequence current signals have zero phase displacement from each other and are prevented from entering the generator by the star connected stator windings. The zero sequence filter allows the zeromore »
- Inventors:
-
- Golden, CO
- Issue Date:
- Research Org.:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- OSTI Identifier:
- 879425
- Patent Number(s):
- 5798632
- Application Number:
- 08/870858
- Assignee:
- Midwest Research Institute (Kansas City, MO)
- 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
- DOE Contract Number:
- AC36-83CH10093
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Muljadi, Eduard. Variable Speed Wind Turbine Generator with Zero-sequence Filter. United States: N. p., 1998.
Web.
Muljadi, Eduard. Variable Speed Wind Turbine Generator with Zero-sequence Filter. United States.
Muljadi, Eduard. Tue .
"Variable Speed Wind Turbine Generator with Zero-sequence Filter". United States. https://www.osti.gov/servlets/purl/879425.
@article{osti_879425,
title = {Variable Speed Wind Turbine Generator with Zero-sequence Filter},
author = {Muljadi, Eduard},
abstractNote = {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 sixty (60) hertz and unity power factor includes an excitation controller for generating three phase commanded current, a generator, and a zero sequence filter. Each commanded current signal includes two components: a positive sequence variable frequency current signal to provide the balanced three phase excitation currents required in the stator windings of the generator to generate the rotating magnetic field needed to recover an optimum level of real power from the generator; and a zero frequency sixty (60) hertz current signal to allow the real power generated by the generator to be supplied to the utility. The positive sequence current signals are balanced three phase signals and are prevented from entering the utility by the zero sequence filter. The zero sequence current signals have zero phase displacement from each other and are prevented from entering the generator by the star connected stator windings. The zero sequence filter allows the zero sequence current signals to pass through to deliver power to the utility.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Aug 25 00:00:00 EDT 1998},
month = {Tue Aug 25 00:00:00 EDT 1998}
}