Method and system for providing increased turbine output for doubly fed induction generator
First Claim
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1. A method for stabilizing disturbances in electric grid currents in a wind turbine energized electric grid, comprising:
- coupling the stator of a wind driven doubly fed induction generator to the grid;
coupling the rotor of the doubly fed induction generator to the grid by way of a line side converter, the line side converter comprising a plurality of current conducting electric switches; and
,providing the current conducting switches of the line side converter with sufficient current carrying capacity to produce frequency support and increased grid stabilizing currents while providing frequency support and requiring lesser amounts of grid stabilizing currents from the stator of the doubly fed induction generator thereby allowing for increased power producing stator current during disturbances in the electric grid.
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Abstract
A system and method for supplying increased frequency supporting current from a doubly fed induction generator (DFIG) to assist in maintaining grid stability is provided. The output capability of a line side converter associated with the DFIG is enhanced by significantly increasing the current handling capacity of electric switches forming the converter. A dynamic brake is also provided across a DC link bus coupling the line side converter to another converter coupled to the rotor of the DFIG. The dynamic brake is controlled based on the voltage across the DC link bus.
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Citations
18 Claims
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1. A method for stabilizing disturbances in electric grid currents in a wind turbine energized electric grid, comprising:
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coupling the stator of a wind driven doubly fed induction generator to the grid; coupling the rotor of the doubly fed induction generator to the grid by way of a line side converter, the line side converter comprising a plurality of current conducting electric switches; and
,providing the current conducting switches of the line side converter with sufficient current carrying capacity to produce frequency support and increased grid stabilizing currents while providing frequency support and requiring lesser amounts of grid stabilizing currents from the stator of the doubly fed induction generator thereby allowing for increased power producing stator current during disturbances in the electric grid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Apparatus for stabilizing disturbances in electric grid currents in a wind turbine energized electric grid, comprising:
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a wind driven doubly fed induction generator having a stator and a rotor, wherein said stator is coupled to said electric grid; and
,a line side converter, the line side converter comprising a plurality of current conducting electric switches configured to couple the rotor of said doubly fed induction generator to said grid; wherein the current conducting switches are provided with sufficient current carrying capacity to produce frequency support and increased grid stabilizing currents while providing frequency support and requiring lesser amounts of grid stabilizing currents from the stator of the doubly fed induction generator thereby allowing for increased power producing stator current during disturbances in the electric grid. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification