Wind turbine generator system
First Claim
1. A wind turbine generator system including a doubly fed generator having a stator and a rotor, a switch arranged on a side of the stator for linkage with a grid, and a converter for exciting a secondary winding of the doubly fed generator, the rotor being coupled to a wind turbine for generating electric power, comprising:
- detecting means for detecting a stator voltage at the switch on the side of the stator and a grid voltage at the switch on a side of the grid; and
controlling means for controlling the converter to excite the secondary winding while the switch is open and closing the switch when the phase of the stator voltage is identical with the phase of the grid voltage.
1 Assignment
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Accused Products
Abstract
To shorten a startup interval to reach a synchronizing condition, a phase difference and an amplitude difference between the grid voltage and the stator voltage of one phase of a winding are obtained. The difference in amplitude is decreased prior to or in parallel to synchronizing the stator voltage with the grid voltage. The calculated compensation phase compensation value is used as an initial value for synchronizing at the next synchronizing operation.
47 Citations
10 Claims
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1. A wind turbine generator system including a doubly fed generator having a stator and a rotor, a switch arranged on a side of the stator for linkage with a grid, and a converter for exciting a secondary winding of the doubly fed generator, the rotor being coupled to a wind turbine for generating electric power, comprising:
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detecting means for detecting a stator voltage at the switch on the side of the stator and a grid voltage at the switch on a side of the grid; and controlling means for controlling the converter to excite the secondary winding while the switch is open and closing the switch when the phase of the stator voltage is identical with the phase of the grid voltage. - View Dependent Claims (2, 3, 4, 8, 10)
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5. A wind turbine generator system including a doubly fed generator having a stator and a rotor, a switch arranged on a side of the stator for linkage with a grid, and a converter for exciting a secondary winding of the doubly fed generator, the rotor being coupled to a wind turbine for generating electric power, comprising:
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first detecting means for detecting a stator voltage at the switch on a side of the stator; second detecting means for detecting a grid voltage at the switch on a side of the grid; third detecting means for detecting a rotation phase of the doubly fed generator; calculating means for calculating a slip frequency from a phase of the grid voltage and the rotation phase; phase controlling means for controlling the converter to excite the secondary winding on the basis of the slip frequency so as to decrease a difference between a phase of the stator voltage and a phase of the grid voltage, when the switch is open; and controlling means for closing the switch when the phase of the stator voltage is identical with the phase of the grid voltage. - View Dependent Claims (6)
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7. A method of controlling a wind turbine generator system including a doubly fed generator having a stator and a rotor, a switch arranged on a side of the stator for linkage with a grid, and a converter for exciting a secondary winding of the doubly fed generator, the rotor being coupled to a wind turbine for generating electric power, comprising the steps of:
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detecting a stator voltage at the switch on a side of the stator and a grid voltage at the switch on a side of the grid; and controlling the converter to excite the secondary winding while the switch is open and closing the switch when a phase of the stator voltage is identical with a phase of the grid voltage. - View Dependent Claims (9)
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Specification