Method, apparatus and computer program product for injecting current
First Claim
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1. A method for modifying an effect of a disturbance in an electric grid on a generator coupled to the grid, the method comprising:
- tracking at least a negative sequence component and a positive sequence component of a signal of the electric grid;
orienting a voltage derived from at least a portion of the magnitude of the negative sequence component for injecting a current into the electric grid; and
,injecting the current into the electric grid to modify the disturbance.
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Abstract
Method and apparatus that provide a response to the negative sequence current demands during a disturbance of the grid system connected to power-generating equipment, such as a wind turbine system, provide for tracking components in the grid signal, orienting at least a portion of the signal, and injecting the oriented portion. Controlled injection of negative sequence current provides for extending small-signal control response, and also provides for modifications of the apparent impedance to the grid interconnect of the power conversion equipment.
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Citations
20 Claims
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1. A method for modifying an effect of a disturbance in an electric grid on a generator coupled to the grid, the method comprising:
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tracking at least a negative sequence component and a positive sequence component of a signal of the electric grid; orienting a voltage derived from at least a portion of the magnitude of the negative sequence component for injecting a current into the electric grid; and
,injecting the current into the electric grid to modify the disturbance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for modifying an effect of a disturbance in an electric grid on a generator coupled to the grid, the apparatus comprising:
a controller for tracking at least a negative sequence component and a positive sequence component of a signal of the electric grid, orienting a voltage derived from at least a portion of the magnitude of the negative sequence component for injecting a current into the electric grid; and
, injecting the current into the electric grid to modify the disturbance.
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14. A computer program product stored on machine readable media, the product comprising instructions for modifying an effect of a disturbance in an electric grid on a generator coupled to the grid, by:
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tracking at least a negative sequence component and a positive sequence component of a signal of the electric grid; orienting a voltage derived from at least a portion of the magnitude of the negative sequence component for injecting a current into the electric grid; and
,injecting the current into the electric grid to modify the disturbance. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification