Method and means for damping subsynchronous oscillations and DC

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

1979-07-23

1981-09-29

Hix, L. T.

Electrical transmission or interconnection systems

Stabilized, anti-hunting or antioscillation systems

323210, G05F 112

Patent

active

042925452

ABSTRACT:
Subsynchronous oscillations and DC offset in an electrical 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.

REFERENCES:
patent: 3233165 (1966-02-01), Bedford
patent: 3551799 (1970-12-01), Koppelmann
patent: 3731183 (1973-05-01), Johnson et al.
patent: 3942100 (1976-03-01), Kauferle et al.

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