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US 2013/0076316 A1Published application
Method and arrangement in connection with a cascade-fed asynchronous generator
AssigneeABB AB
InventorReijo Kalevi VIRTANEN
Life of this patent
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AssigneeABB AB
InventorReijo Kalevi VIRTANEN
Estimating the term…
A method and apparatus are provided for controlling a cascade-fed asynchronous generator in connection with a voltage dip of a network fed by the generator. A frequency converter is connected between the rotor of the asynchronous generator and the network. The method includes measuring the magnitude of the voltage in the network, calculating, on the basis of the voltage in the network, a base value for reactive current to be fed to the network, generating reactive current in the network by the generator, measuring the stator current, determining the actual value of the reactive current in the network, calculating the difference between the base value and the actual value of the reactive current, providing the calculated difference to the frequency converter to serve as an instruction in reactive current, and generating reactive current in the network by the frequency converter in accordance with the instruction in reactive current.
A method for controlling a cascade-fed asynchronous generator in connection with a voltage dip of a network fed by the generator, wherein a frequency converter is connected between a rotor of the asynchronous generator and the network, by the method comprising:
An apparatus for controlling a cascade-fed asynchronous generator in connection with a voltage dip of a network fed by the generator, wherein a frequency converter is connected between a rotor of the asynchronous generator and the network, wherein the apparatus comprises:
An apparatus according to 5, comprising:
Dependencies are inferred from the claim text.