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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 (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:
 [1];  [1];  [1]
  1. (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) OSTI
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}
}

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