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

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.
 [1] ;  [1] ;  [1]
  1. (Portland, OR)
Publication Date:
OSTI Identifier:
Report Number(s):
US 4333021
Resource Type:
Research Org:
Country of Publication:
United States
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