Method in frequency converter provided with voltage...

Electricity: single generator systems – Automatic control of generator or driving means – Speed or frequency of generator

Reexamination Certificate

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Details

C322S032000, C322S099000, C363S037000, C363S123000

Reexamination Certificate

active

11194598

ABSTRACT:
A method in a frequency converter provided with a voltage intermediate circuit in connection with interference in a network (5) to be supplied and a frequency converter (2), which comprises a network converter part (4) and an inverter part (3) and a DC intermediate circuit (7) between them. The method comprises steps of controlling the intermediate circuit voltage at the beginning of network interference by limiting the torque on the inverter side, detecting interference in the network voltage, setting a torque reference to a predetermined value in response to the network interference, detecting network voltage recovery, and controlling the torque reference to a normal value in response to the network voltage recovery.

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L. Holdsworth et al., “Comparison of Fixed Speed and Doubly-Fed Induction Wind Turbines During Power System Disturbances”, IEE Proc.-Gener. Transn. Distrib., May 2003, pp. 343-352, vol. 150, No. 3.
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