Electrical transmission or interconnection systems – Plural supply circuits or sources – Connecting or disconnecting
Patent
1980-05-12
1982-06-01
Adams, Russell E.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Connecting or disconnecting
307127, H02J 100, H02J 300
Patent
active
043330215
ABSTRACT:
A method and system for enhancing the transient stability of an intertied three-phase electric power generating system. A set of power exporting generators (10) is connected to a set of power importing generators (20). When a transient cannot be controlled by conventional stability controls, and imminent loss of synchronism is detected (such as when the equivalent rotor angle difference between the two generator sets exceeds a predetermined value, such as 150 degrees), the intertie is disconnected by circuit breakers. Then a switch (30) having a 120-degree phase rotation, or a circuit breaker having a 120-degree phase rotation is placed in the intertie. The intertie is then reconnected. This results in a 120-degree reduction in the equivalent rotor angle difference between the two generator sets, making the system more stable and allowing more time for the conventional controls to stabilize the transient.
REFERENCES:
patent: 3559042 (1971-01-01), Gingell
patent: 3586871 (1971-06-01), Seidel
patent: 3740572 (1973-06-01), Cohn
patent: 4021704 (1977-05-01), Norbeck
"Transient Stability Enhancement by 120-Degree Phase Rotation" IEEE Winter Power Meeting, Dec. 1979.
"Improvement of Power System Transient Stability by Phase-Shift Insertion" Proc. IEEE vol. 120 No. 2.
Cresap Richard L.
Kreipe Michael J.
Taylor Carson W.
Adams Russell E.
Besha Richard G.
Constant Richard E.
Denny James E.
The United States of America as represented by the United States
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