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Title: Transient stability enhancement of electric power generating systems by 120-degree phase rotation

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 is connected to a set of power importing generators. 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 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.

Inventors:
; ;
Publication Date:
OSTI Identifier:
6462899
Patent Number(s):
US 4333021
Assignee:
Dept. of Energy
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 12 May 1980; Other Information: PAT-APPL-148863
Country of Publication:
United States
Language:
English
Subject:
20 FOSSIL-FUELED POWER PLANTS; ELECTRIC GENERATORS; PHASE SHIFT; POWER SYSTEMS; STABILIZATION; CIRCUIT BREAKERS; POWER GENERATION; ROTATION; ROTORS; SWITCHES; SYNCHRONIZATION; TRANSIENTS; ELECTRICAL EQUIPMENT; ENERGY SYSTEMS; EQUIPMENT; EQUIPMENT PROTECTION DEVICES; MOTION; 200100* - Fossil-Fueled Power Plants- Power Plants & Power Generation

Citation Formats

Cresap, R L, Kreipe, M J, and Taylor, C W. Transient stability enhancement of electric power generating systems by 120-degree phase rotation. United States: N. p., 1982. Web.
Cresap, R L, Kreipe, M J, & Taylor, C W. Transient stability enhancement of electric power generating systems by 120-degree phase rotation. United States.
Cresap, R L, Kreipe, M J, and Taylor, C W. Tue . "Transient stability enhancement of electric power generating systems by 120-degree phase rotation". United States.
@article{osti_6462899,
title = {Transient stability enhancement of electric power generating systems by 120-degree phase rotation},
author = {Cresap, R L and Kreipe, M J and Taylor, C W},
abstractNote = {A method and system for enhancing the transient stability of an intertied three-phase electric power generating system. A set of power exporting generators is connected to a set of power importing generators. 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 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.},
doi = {},
url = {https://www.osti.gov/biblio/6462899}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1982},
month = {6}
}