CPC H02J 3/1885 (2013.01) [H02J 3/1878 (2013.01); H02J 3/30 (2013.01)] | 3 Claims |
1. A method for stabilizing an AC voltage grid, which comprises the steps of:
providing a rotating phase-shifter that exchanges reactive power with the AC voltage grid during normal operation;
connecting the rotating phase-shifter to the AC voltage grid by way of a converter upon identification of a predetermined frequency drop in the AC voltage grid;
disconnecting the rotating phase-shifter from the AC voltage grid, upon identification of a frequency drop, by opening a switch and instead connecting the rotating phase-shifter to the AC voltage grid via the converter by further closing an input switch between the rotating phase-shifter and the converter; and
feeding stored energy of the rotating phase-shifter into the AC voltage grid in a form of active power.
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