US7622815B2
Active / In Force
US
⏱️ 0.2 years remaining
Low voltage ride through system for a variable speed wind turbine having an exciter machine and a power converter not connected to the grid
Assignee: Ingeteam Power Technology SA
•
Filing: 2006-12-29
•
Granted: 2009-11-24
•
Expires: 2026-12-29
Abstract
Abstract A variable speed wind turbine having a doubly fed induction generator (DFIG) includes an exciter machine mechanically coupled to the DFIG and a power converter placed between a rotor of the DFIG and the exciter machine which guarantees a stable voltage to the power converter. Thus, the power converter is not directly connected to the grid allowing the continuous operation of the system during a low voltage event in the grid.
Inventors
- 👤 Gregorio Rivas
- 👤 Iker Garmendia
- 👤 Josu Elorriaga
- 👤 Jesus Mayor
- 👤 Javier Perez Barbachano
- 👤 David Sole
- 👤 Jorge Acedo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:05
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/007; H02P9/10; H02P9/102; F; F05; F05B; F05B2270/00; F05B2270/10; F05B2270/107; F05B2270/1071; F05B2270/10711; H02P2101/00; H02P2101/15
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
115 words
A method for operating a variable speed wind turbine comprising: converting wind energy into mechanical power using a rotor to rotate a drive train; converting the mechanical power into electrical power utilising a doubly fed induction generator (DFIG) coupled to the drive train; using an exciter machine coupled to the drive train and a power conversion system isolated from the power grid, to receive power generated by a rotor of the DFIG or to provide power required by the rotor of the DFIG; transferring electrical energy between the rotor of the DFIG and the drive train, through the power conversion system and the exciter machine in response to a low voltage event in the grid.
Claim 2
Independent Claim
115 words
A method for operating a variable speed wind turbine comprising: converting wind energy into mechanical power using a rotor to rotate a drive train; converting the mechanical power into electrical power utilising a doubly fed induction generator (DFIG) coupled to the drive train; using an exciter machine coupled to the drive train and a power conversion system isolated from the power grid, to receive power generated by a rotor of the DFIG or to provide power required by the rotor of the DFIG; transferring electrical energy between the rotor of the DFIG and the drive train, through the power conversion system and the exciter machine in response to a low voltage event in the grid.
Claim 3
Dependent Claim
24 words
The method defined in claim 1 , further comprising adjusting rotor currents in order to generate desired stator currents to meet grid connection requirements.
Claim 4
Dependent Claim
27 words
The method defined in claim 2 , wherein the rotor currents are adjusted in order to supply reactive current to the grid during the low voltage event.
Claim 5
Dependent Claim
27 words
The method defined in claim 2 , wherein the rotor currents are adjusted in order to supply real current to the grid during the low voltage event.
Claim 6
Dependent Claim
32 words
The method defined in claim 2 , wherein the rotor currents are adjusted in order to supply a mix of real and reactive current to the grid during the low voltage event.
Claim 7
Dependent Claim
26 words
The method defined in claim 2 wherein the rotor currents are adjusted in order to supply reactive power to the grid during the low voltage event.
Claim 8
Dependent Claim
26 words
The method defined in claim 2 wherein the rotor currents are adjusted in order to supply real power to the grid during the low voltage event.
Claim 9
Dependent Claim
31 words
The method defined in claim 2 wherein the rotor currents are adjusted in order to supply a mix of real and reactive power to the grid during the low voltage event.
Claim 10
Dependent Claim
22 words
A method for operating a power conversion system defined in claim 1 , wherein switching frequencies can be dynamically adjusted and modified.
Claim 11
Dependent Claim
27 words
The method defined in claim 6 , wherein a switching frequency of an exciter side converter of the power conversion system can be dynamically adjusted and modified.
Claim 12
Dependent Claim
27 words
The method defined in claim 6 , wherein a switching frequency of a rotor side converter of the power conversion system can be dynamically adjusted and modified.
Claim 13
Dependent Claim
116 words
A variable speed wind turbine comprising: a rotor shaft including at least one blade; a drive train coupled to the rotor shaft, the drive train including a doubly fed induction generator (DFIG), said DFIG having at least a stator connectable to a power grid; an exciter machine coupled to the drive train; and a power conversion device isolated from the grid and electrically coupled to a rotor of the doubly fed induction generator and to the exciter machine to transfer electrical power between the rotor and the exciter machine; wherein the exciter machine is used as a power supply for components of the wind turbine when the generator speed is at or above a predefined value.
Claim 14
Dependent Claim
116 words
A variable speed wind turbine comprising: a rotor shaft including at least one blade; a drive train coupled to the rotor shaft, the drive train including a doubly fed induction generator (DFIG), said DFIG having at least a stator connectable to a power grid; an exciter machine coupled to the drive train; and a power conversion device isolated from the grid and electrically coupled to a rotor of the doubly fed induction generator and to the exciter machine to transfer electrical power between the rotor and the exciter machine; wherein the exciter machine is used as a power supply for components of the wind turbine when the generator speed is at or above a predefined value.
Claim 15
Dependent Claim
37 words
The variable speed wind turbine system of claim 12 further comprising: means for generating an alternating current (AC) and a direct current (DC) power in response to the generator speed being at or above a predefined value.
Claim 16
Dependent Claim
32 words
The variable speed wind turbine system of claim 12 further comprising: means for generating an alternating current (AC) auxiliary power supply; and means for generating a direct current (DC) auxiliary power supply.
Claim 17
Dependent Claim
52 words
The variable speed wind turbine system of claim 12 , further comprising: an alternating current/direct current (AC/DC) converter coupled to the exciter machine which generates a direct current (DC) power supply; and a direct current/alternating current (DC/AC) converter connected to the DC power supply which generates an alternating (AC) auxiliary power supply.
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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) | 2012-11-23 | 2013-05-25 | 2013-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2016-11-23 | 2017-05-25 | 2017-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2020-11-23 | 2021-05-25 | 2021-11-24 | $7700.00 | Window Closed / Lapsed |