Method and means for damping subsynchronous oscillations and...

Details Method and means for damping subsynchronous oscillations and... Method and means for damping subsynchronous oscillations and...

G - Physics

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G05F 1/44 (2006.01) H02J 3/18 (2006.01) H02J 3/24 (2006.01)

Patent

CA 1131309

METHOD AND MEANS FOR DAMPING SUBSYNCHRONOUS OSCILLATIONS AND DC OFFSET IN AN AC POWER SYSTEM Abstract of the Disclosure Subsynchronous oscillations and DC offset in an electri- cal power system are dampened by measuring the half-cycle period of current or voltage line waves, comparing the measured half-cycle time periods to a desired half-cycle time period and dissipating the line waves in measured half-cycle time periods which are longer than the desired half-cycle time period. Damping apparatus includes a reactance connected in a power line with selectively bi- directional conductors in parallel with the reactance whereby the reactance can be shorted. Alternatively, the selectively bi-directional conductors can connect a power line to ground or neutral when half-cycle time periods exceed a desired half-cycle time period.

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