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 (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.
- Inventors:
-
- Portland, OR
- Issue Date:
- Research Org.:
- BPA
- OSTI Identifier:
- 864230
- Patent Number(s):
- 4333021
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
H - ELECTRICITY H02 - GENERATION H02J - CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- transient; stability; enhancement; electric; power; generating; systems; 120-degree; phase; rotation; method; enhancing; intertied; three-phase; set; exporting; generators; 10; connected; importing; 20; controlled; conventional; controls; imminent; loss; synchronism; detected; equivalent; rotor; angle; difference; generator; sets; exceeds; predetermined; value; 150; degrees; intertie; disconnected; circuit; breakers; switch; 30; breaker; placed; reconnected; results; reduction; stable; allowing; time; stabilize; power generating; electric power; circuit breaker; predetermined value; degree phase; phase electric; transient stability; generator set; generating systems; /307/
Citation Formats
Cresap, Richard L, Taylor, Carson W, and Kreipe, Michael J. Transient stability enhancement of electric power generating systems by 120-degree phase rotation. United States: N. p., 1982.
Web.
Cresap, Richard L, Taylor, Carson W, & Kreipe, Michael J. Transient stability enhancement of electric power generating systems by 120-degree phase rotation. United States.
Cresap, Richard L, Taylor, Carson W, and Kreipe, Michael J. Fri .
"Transient stability enhancement of electric power generating systems by 120-degree phase rotation". United States. https://www.osti.gov/servlets/purl/864230.
@article{osti_864230,
title = {Transient stability enhancement of electric power generating systems by 120-degree phase rotation},
author = {Cresap, Richard L and Taylor, Carson W and Kreipe, Michael J},
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 (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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1982},
month = {1}
}