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US6566764B2
Expired / Lapsed
US
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Variable speed wind turbine having a matrix converter
Assignee: Vestas Wind Systems AS
•
Filing: 2001-05-23
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Granted: 2003-05-20
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Expires: 2021-05-23
Abstract
Abstract 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 the system allowing for sensorless detection of rotor position and better output ratios of power from the system.
Inventors
- 👤 Anders V. Rebsdorf
- 👤 Lars Helle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:31
CPC Classifications
F; F03; F03D; F03D7/00; F03D7/02; F03D7/028; F03D7/0284; F03D9/00; F03D9/20; F03D9/25; F03D9/255; H; H02; H02M; H02M1/00; H02M1/42; H02M5/00; H02M5/02; H02M5/04; H02M5/22; H02M5/275; H02M5/297; H02P; H02P9/00; H02P9/007; H02P9/42; F05; F05B; F05B2270/00; F05B2270/10; F05B2270/1016; H02P2101/00; H02P2101/15; Y; Y02; Y02B; Y02B70/00; Y02B70/10; Y02E; Y02E10/00; Y02E10/70; Y02E10/72; Y02E10/76
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
68 words
A variable speed wind turbine, comprising: a turbine rotor including at least one blade mounted to a rotatable turbine shaft; an induction generator having a stator and a rotor coupled to the turbine shaft for rotation therewith; a matrix converter including an array of switching elements; a matrix converter control unit to control the switching elements; and a protection circuit for protecting the matrix converter against over voltages.
Claim 2
Dependent Claim
68 words
A variable speed wind turbine, comprising: a turbine rotor including at least one blade mounted to a rotatable turbine shaft; an induction generator having a stator and a rotor coupled to the turbine shaft for rotation therewith; a matrix converter including an array of switching elements; a matrix converter control unit to control the switching elements; and a protection circuit for protecting the matrix converter against over voltages.
Claim 3
Dependent Claim
22 words
A turbine according to claim 1 , having a voltage gradient limiting circuit located between the matrix converter and the generator rotor.
Claim 4
Dependent Claim
16 words
A turbine according to claim 2 , wherein the voltage gradient limiting circuit includes an inductance.
Claim 5
Dependent Claim
18 words
A turbine according to claim 2 , wherein the voltage gradient limiting circuit includes an inductance capacitor filter.
Claim 6
Dependent Claim
43 words
A turbine according to claim 1 , including a transformer with at least three windings including a tertiary winding; and means for adjusting voltage at the tertiary winding, wherein a ratio of the input potential to the output potential is greater than 0.866.
Claim 7
Dependent Claim
58 words
A turbine according to claim 1 , including a generator with a winding ratio; and means for adjusting the winding ratio of the generator wherein a reduced matrix converter gain is overcome, wherein a ratio of the input potential to the output potential is greater than 0.866 and whereby a current rating of the switching elements is increased.
Claim 8
Dependent Claim
27 words
A turbine according to claim 1 , having a protection circuit for protecting the matrix converter against over voltages and for retaining control after a grid disruption.
Claim 9
Dependent Claim
19 words
A turbine of claim 1 , having means for position sensorless detection of the position of said turbine rotor.
Claim 10
Dependent Claim
17 words
A turbine according to claim 8 , further including the measurement of the current of said rotor.
Claim 11
Dependent Claim
14 words
A turbine according to claim 8 , further including the circulation of reactive power.
Claim 12
Dependent Claim
15 words
A turbine according to claim 1 , having a power controller for circulating reactive energy.
Claim 13
Dependent Claim
26 words
A turbine according to claim 1 , having a power controller for controlling the power factor of the turbine without impacting the circulation of reactive power.
Claim 14
Dependent Claim
20 words
A turbine according to claim 1 , wherein at least one of said switching elements comprises a standard H-Bridge module.
Claim 15
Dependent Claim
24 words
A turbine according to claim 1 , wherein said stator further includes a stator winding means for shifting between a Y-connection and a Δ-connection.
Claim 16
Dependent Claim
21 words
A turbine according to claim 1 , which further includes a means for the facilitating the active damping of current harmonics.
Claim 17
Dependent Claim
20 words
A turbine according to 1 , which further includes a means for facilitating the active damping of resultant drive-train oscillations.
Claim 18
Dependent Claim
20 words
A turbine according to 1 , which further includes a means for facilitating the active damping of resultant drive-train oscillations.
Claim 19
Dependent Claim
16 words
A turbine according to claim 1 , wherein the induction generator is a doubly-fed induction generator.
Claim 20
Independent Claim
36 words
A method for a variable speed wind turbine comprising: supplying power from an induction generator to a power grid using a matrix converter including using a protection circuit for protecting the matrix converter from over voltages.
Claim 21
Independent Claim
36 words
A method for a variable speed wind turbine comprising: supplying power from an induction generator to a power grid using a matrix converter including using a protection circuit for protecting the matrix converter from over voltages.
Claim 22
Dependent Claim
19 words
The method of claim 18 , wherein the protection circuit retains control of the matrix converter after grid disruption.
Claim 23
Dependent Claim
16 words
The method of claim 18 , wherein the power is supplied from a doubly-fed induction generator.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-05-19 | 2006-11-18 | 2007-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-05-19 | 2010-11-18 | 2011-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-05-19 | 2014-11-18 | 2015-05-20 | $7700.00 | Window Closed / Lapsed |