Phase shifting transformer arrangement for damping subsynchronou

Details Phase shifting transformer arrangement for damping subsynchronou Phase shifting transformer arrangement for damping subsynchronou

1984-04-09

1986-01-28

Beha, Jr., William H.

Electricity: single generator systems

Generator control

With means for suppressing, eliminating or minimizing...

307102, 323215, H02P 900

Patent

active

045674230

ABSTRACT:
Subsynchronous oscillations in a polyphase power network can be effectively damped with a switching arrangement having a thyristor-switched regulation and a phase shifting polyphase power system. The arrangement is controllable and is periodic in nature, being responsive to a measurement signal representing a physical parameter of the subsynchronous oscillations. This signal preferably represents the difference between the instantaneous rotational frequency of the generator and a set-point value for that frequency. Control windings are connected in series with the power-network-side polyphase windings of a block transformer. Voltages induced in these control windings are phase shifted with respect to the voltages in the respective associated power-network-side polyphase windings of the block transformer. These voltages in the control windings produce a very effective damping torque on the generator, to damp out the subsynchronous oscillations.

REFERENCES:
patent: 4384246 (1983-05-01), Larsen et al.
Mathur et al., "A Thyrister Controlled Static Phase-Shifter for AC Power Transmission", Conf. Paper, IEEE 1980 Power Engineering Spec. Summer Meeting, Minneapolis, Mn., USA, (Jul. 13-18, 1980), 6 pages.

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