Variable speed wind turbine having a passive grid side rectifier with scalar power control and dependent pitch control
First Claim
1. A variable speed wind turbine comprising:
- an electrical generator to provide power for a power grid; and
a power conversion system coupled to the electrical generator, the power conversion system including a passive grid side rectifier, the power conversion system to provide power from the power grid to the electrical generator using the passive grid side rectifier.
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Accused Products
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 scalar 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.
150 Citations
39 Claims
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1. A variable speed wind turbine comprising:
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an electrical generator to provide power for a power grid; and
a power conversion system coupled to the electrical generator, the power conversion system including a passive grid side rectifier, the power conversion system to provide power from the power grid to the electrical generator using the passive grid side rectifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A variable speed wind turbine comprising:
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means for generating power to a power grid;
a power conversion system to provide power from the power grid to the means for generating power at below synchronous speed and to dissipate excess power from the means for generating power at above synchronous speed; and
a controller coupled to the power conversion system to control the power conversion system and to provide power control for the means for generating power.
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11. A system comprising:
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a generator side converter;
a direct current (DC) link coupled to the generator side converter;
a power dissipating element coupled to the DC link to selectively dissipate excess power from a generator; and
a passive grid side rectifier to convert fixed frequency alternating current (AC) signals from a power grid to DC voltage, wherein the DC voltage is supplied to the generator side converter via the DC link and the generator side converter is to convert the DC voltage into variable frequency AC signals for the generator.
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12. A method for a variable speed wind turbine comprising:
supplying power from a power grid to an electrical generator using a passive grid side rectifier at below synchronous speed. - View Dependent Claims (13)
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14. A method of operating a variable speed wind turbine, comprising:
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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.
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15. A variable speed wind turbine comprising:
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an electrical power generating system to provide power to a power grid;
a controller coupled to the electrical power generating system to control the electrical power generating system based on an error signal; and
a pitch controller coupled to the electrical power generating system and the controller, the pitch controller receiving a signal based on the error signal. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A method for controlling power from an electrical generator to a power grid comprising:
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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. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A system for controlling power from an electrical generator to a power grid comprising:
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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. - View Dependent Claims (28, 29, 30, 31, 32, 33)
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34. A method of controlling the pitch of a wind turbine blade, comprising:
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determining if a power error signal exceeds at least one predetermined boundary; and
sending a signal to a pitch controller based on the determining to change the pitch of the wind turbine blade. - View Dependent Claims (35, 36)
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37. A system for controlling the pitch of a wind turbine blade, comprising:
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means for determining if a power error signal exceeds at least one predetermined boundary; and
means for sending a signal to a pitch controller based on the determining to change the pitch of the wind turbine blade. - View Dependent Claims (38, 39)
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Specification