US6853094B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable speed wind turbine having a passive grid side rectifier with scalar power control and dependent pitch control
Assignee: Vestas Wind Systems AS
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Filing: 2004-06-01
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Granted: 2005-02-08
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Expires: 2024-06-01
Abstract
Abstract A variable speed wind turbine having a passive grid side rectifier using scalar power control and dependent pitch control is disclosed. The variable speed turbine may include an electrical generator to provide power for a power grid and a power conversion system coupled to the electrical generator. The power conversion system may include at least one passive grid side rectifier. The power conversion system may provide power to the electrical generator using the passive grid side rectifier. The variable speed wind turbine may also use scaler power control to provide more precise control of electrical quantities on the power grid. The variable speed wind turbine may further use dependent pitch control to improve responsiveness of the wind turbine.
Inventors
- 👤 Lorenz Feddersen
- 👤 Eckardt Siebenthaler
- 👤 Björn Andresen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:27
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/04; F; F03; F03D; F03D7/00; F03D7/02; F03D7/022; F03D7/0224; F03D9/00; F03D9/20; F03D9/25; F03D9/255; F03D15/00; F03D15/10; F05; F05B; F05B2270/00; F05B2270/10; F05B2270/1016; F05B2270/20; F05B2270/30; F05B2270/32; F05B2270/327; F05B2270/328; F05B2270/337; F05B2270/70; F05B2270/705; H02P2101/00; H02P2101/15; Y; Y02; Y02E; Y02E10/00; Y02E10/70; Y02E10/72
Claims Analysis
Total Claims: 43
Claim 1
Independent Claim
58 words
A method of operating a variable speed wind turbine, comprising: configuring at least two phases of a stator or a generator for connection to a utility grid; providing a plurality of switches on the rotor-side of a generator; and controlling the switches such that electrical quantities for at least two phases of the utility grid are controlled independently.
Claim 2
Independent Claim
58 words
A method of operating a variable speed wind turbine, comprising: configuring at least two phases of a stator or a generator for connection to a utility grid; providing a plurality of switches on the rotor-side of a generator; and controlling the switches such that electrical quantities for at least two phases of the utility grid are controlled independently.
Claim 3
Independent Claim
96 words
A method for controlling power from an electrical generator to a power grid comprising: receiving voltage values and current values of the power grid relative to a time-based system; calculating active and reactive power from the voltage and current values without converting from the time-based system; determining a power error based on the active and reactive power; generating current reference values to control rotor currents in the electrical generator based on the determined power error without converting from the time-based system; and controlling the rotor currents in the electrical generator based on the current reference values.
Claim 4
Independent Claim
96 words
A method for controlling power from an electrical generator to a power grid comprising: receiving voltage values and current values of the power grid relative to a time-based system; calculating active and reactive power from the voltage and current values without converting from the time-based system; determining a power error based on the active and reactive power; generating current reference values to control rotor currents in the electrical generator based on the determined power error without converting from the time-based system; and controlling the rotor currents in the electrical generator based on the current reference values.
Claim 5
Dependent Claim
30 words
The method of claim 2 , wherein the receiving of the voltage values and current values includes receiving the voltage and current values for each phase of the power grid.
Claim 6
Dependent Claim
41 words
The method of claim 3 , wherein the calculating of the active and reactive power includes calculating the active and reactive power for each phase of the power grid using the voltage and current values for each of the power grid.
Claim 7
Dependent Claim
34 words
The method of claim 2 , wherein the generating of the current reference values includes generating the current reference values based on the determined power error, a power grid frequency, and a generator speed.
Claim 8
Dependent Claim
38 words
The method of claim 2 , wherein the controlling of the rotor currents in the electrical generator includes controlling the rotor currents for each phase of the rotor in the electrical generator based on the current reference values.
Claim 9
Dependent Claim
27 words
The method of claim 2 , further comprising: controlling electrical quantities in each phase of the power grid by controlling the rotor currents in the electrical generator.
Claim 10
Independent Claim
106 words
A system for controlling power from an electrical generator to a power grid comprising: means for receiving voltage values and current values of the power grid relative to a time-based system; means for calculating active and reactive power from the voltage and current values without converting from the time-based system; means for determining a power error based on the active and reactive power; means for generating current reference values to control rotor currents in the electrical generator based on the determined power error without converting from the time-based system; and means for controlling the rotor currents in the electrical generator based on the current reference values.
Claim 11
Independent Claim
106 words
A system for controlling power from an electrical generator to a power grid comprising: means for receiving voltage values and current values of the power grid relative to a time-based system; means for calculating active and reactive power from the voltage and current values without converting from the time-based system; means for determining a power error based on the active and reactive power; means for generating current reference values to control rotor currents in the electrical generator based on the determined power error without converting from the time-based system; and means for controlling the rotor currents in the electrical generator based on the current reference values.
Claim 12
Dependent Claim
27 words
The system of claim 8 , wherein the means for generating current reference values includes means for generating current reference values without converting from a time-based system.
Claim 13
Dependent Claim
34 words
The system of claim 8 , wherein the means for receiving of the voltage values and current values includes means for receiving the voltage and current values for each phase of the power grid.
Claim 14
Dependent Claim
45 words
The system of claim 10 , wherein the means for calculating of the active and reactive power includes means for calculating the active and reactive power for each phase of the power grid using the voltage and current values for each of the power grid.
Claim 15
Dependent Claim
38 words
The system of claim 8 , wherein the means for generating of the current reference values includes means for generating the current reference values based on the determined power error, a power grid frequency, and a generator speed.
Claim 16
Dependent Claim
42 words
The system of claim 8 , wherein the means for controlling of the rotor currents in the electrical generator includes means for controlling the rotor currents for each phase of the rotor in the electrical generator based on the current reference values.
Claim 17
Dependent Claim
29 words
The system of claim 8 , further comprising: means for controlling electrical quantities in each phase of the power grid by controlling the rotor currents in the electrical generator.
Claim 18
Independent Claim
46 words
A method for a variable speed wind turbine comprising: generating rotor currents for an electrical generator connected to wind blades, the rotor currents corresponding to a plurality of phases of a power grid; and controlling independently the rotor currents for each phase of the power grid.
Claim 19
Independent Claim
46 words
A method for a variable speed wind turbine comprising: generating rotor currents for an electrical generator connected to wind blades, the rotor currents corresponding to a plurality of phases of a power grid; and controlling independently the rotor currents for each phase of the power grid.
Claim 20
Dependent Claim
35 words
The method of claim 15 , wherein controlling independently the rotor currents includes controlling independently rotor currents for each phase of the power grid based on electrical characteristics of each phase of the power grid.
Claim 21
Dependent Claim
45 words
A variable speed wind turbine comprising: a generator connected to wind blades that provides rotor currents, the rotor currents corresponding to a plurality of phases of a power grid; and a controller to independently control the rotor currents for each phase of the power grid.
Claim 22
Dependent Claim
45 words
A variable speed wind turbine comprising: a generator connected to wind blades that provides rotor currents, the rotor currents corresponding to a plurality of phases of a power grid; and a controller to independently control the rotor currents for each phase of the power grid.
Claim 23
Dependent Claim
34 words
The variable speed wind turbine of claim 17 , wherein the controller controls independently rotor currents for each phase of the power grid based on electrical characteristics of each phase of the power grid.
Claim 24
Independent Claim
57 words
A method for a variable speed wind turbine comprising: generating electrical power for a power grid using a rotor and stator of an electrical generator; and controlling active switches in a power converter using a scalar control algorithm that controls each phase of the rotor based on measured electrical quantities of each phase of the power grid.
Claim 25
Independent Claim
57 words
A method for a variable speed wind turbine comprising: generating electrical power for a power grid using a rotor and stator of an electrical generator; and controlling active switches in a power converter using a scalar control algorithm that controls each phase of the rotor based on measured electrical quantities of each phase of the power grid.
Claim 26
Dependent Claim
22 words
The method of claim 19 , wherein controlling the active switches includes controlling the active switches using pulse width modulation (PWM) techniques.
Claim 27
Dependent Claim
30 words
The method of claim 19 , further comprising: receiving at least power grid frequency values and rotor current values for each phase of the rotor to control the active switches.
Claim 28
Dependent Claim
24 words
The method of claim 19 , further comprising: controlling the electrical power to the power grid without performing a coordinate transformation of AC signals.
Claim 29
Dependent Claim
63 words
A variable speed wind turbine comprising: an electrical generator having a rotor and stator to generate electrical power for a power grid; and a power converter to control the generated electrical power, the power converter including active switches controlled by a scalar control algorithm that controls each phase of the rotor based on measured electrical quantities of each phase of the power grid.
Claim 30
Dependent Claim
63 words
A variable speed wind turbine comprising: an electrical generator having a rotor and stator to generate electrical power for a power grid; and a power converter to control the generated electrical power, the power converter including active switches controlled by a scalar control algorithm that controls each phase of the rotor based on measured electrical quantities of each phase of the power grid.
Claim 31
Dependent Claim
22 words
The variable speed wind turbine of claim 23 , further comprising a controller to control the active switches of the power converter.
Claim 32
Dependent Claim
22 words
The variable speed wind turbine of claim 24 , wherein the controller controls the active switches using pulse width modulation (PWM) techniques.
Claim 33
Dependent Claim
34 words
The variable speed wind turbine of claim 24 , wherein the controller receives at least power grid frequency values and rotor current values for each phase of the rotor to control the active switches.
Claim 34
Dependent Claim
27 words
The variable speed wind turbine of claim 26 , wherein the controller controls electrical power to the power grid without performing a coordinate transformation of AC signals.
Claim 35
Independent Claim
121 words
A method for a power controller of a variable speed wind turbine comprising: receiving power grid related information for a power grid; calculating active and reactive power values for the power grid based on the received power grid related information; comparing the calculated active and reactive power values with reference active and reactive power values, respectively; generating current reference values based on the comparison of the calculated active and reactive power values with the reference active and reactive power values; comparing the generated current reference values with measured current values; and generating new current values to control the active and reactive power for the power grid based on the comparison of the generated current reference values with the measured current values.
Claim 36
Independent Claim
121 words
A method for a power controller of a variable speed wind turbine comprising: receiving power grid related information for a power grid; calculating active and reactive power values for the power grid based on the received power grid related information; comparing the calculated active and reactive power values with reference active and reactive power values, respectively; generating current reference values based on the comparison of the calculated active and reactive power values with the reference active and reactive power values; comparing the generated current reference values with measured current values; and generating new current values to control the active and reactive power for the power grid based on the comparison of the generated current reference values with the measured current values.
Claim 37
Dependent Claim
25 words
The method of claim 28 , wherein the power grid related information includes voltage and current measurement values for each phase of the power grid.
Claim 38
Dependent Claim
21 words
The method of claim 28 , further comprising: generating control signals to control active switches that output the new current values.
Claim 39
Dependent Claim
18 words
The method of claim 30 , wherein the active switches are controlled using pulse width modulation (PWM) techniques.
Claim 40
Dependent Claim
103 words
A computer-readable medium containing instructions, which if executed by a computing system, causes the computing system to perform a method comprising: receiving voltage values and current values of a power grid relative to a time-based system; calculating active and reactive power from the voltage and current values without converting from the time-based system; determining a power error based on the active and reactive power; generating current reference values to control rotor currents in an electrical generator based on the determined power error without converting from the time-based system; and controlling the rotor currents in the electrical generator based on the current reference values.
Claim 41
Dependent Claim
103 words
A computer-readable medium containing instructions, which if executed by a computing system, causes the computing system to perform a method comprising: receiving voltage values and current values of a power grid relative to a time-based system; calculating active and reactive power from the voltage and current values without converting from the time-based system; determining a power error based on the active and reactive power; generating current reference values to control rotor currents in an electrical generator based on the determined power error without converting from the time-based system; and controlling the rotor currents in the electrical generator based on the current reference values.
Claim 42
Dependent Claim
129 words
A computer-readable medium containing instructions, which if executed by a computing system, causes the computing system to perform a method comprising: receiving power grid related information for the power grid; calculating active and reactive power values for the power grid based on the received power grid related information; comparing the calculated active and reactive power values with reference active and reactive power values, respectively; generating current reference values based on the comparison of the calculated active and reactive power values with the reference active and reactive power values; comparing the generated current reference values with measured current values; and generating new current values to control the active and reactive power for the power grid based on the comparison of the generated current reference values with the measured current values.
Claim 43
Dependent Claim
129 words
A computer-readable medium containing instructions, which if executed by a computing system, causes the computing system to perform a method comprising: receiving power grid related information for the power grid; calculating active and reactive power values for the power grid based on the received power grid related information; comparing the calculated active and reactive power values with reference active and reactive power values, respectively; generating current reference values based on the comparison of the calculated active and reactive power values with the reference active and reactive power values; comparing the generated current reference values with measured current values; and generating new current values to control the active and reactive power for the power grid based on the comparison of the generated current reference values with the measured current values.
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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) | 2008-02-08 | 2008-08-09 | 2009-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2012-02-08 | 2012-08-09 | 2013-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2016-02-08 | 2016-08-09 | 2017-02-08 | $7700.00 | Window Closed / Lapsed |