Transient stability criterion based on time-domain simulation and its application in contingency screening

LU Dan-dan， WANG Jian-quan
（School of Electrical Engineering， Zhejiang University， Hangzhou 310027， China）

Abstract： In order to solve the transient stability computation problem caused by the use of angle criterion during the power system assessment，a transient stability criterion called EAC method was proposed，after the research of the EAC，which helps reducing the computation time，by applying single machine equivalent（SIME） method in the transient stability based on time-domain simulation. The criterion based on SIME，replaces a multi-machine power system by an one-machine system，and refreshes the date of the one machine infinite bus（OMIB） system at each step of the simulation，terminates the computation when it fits the EAC，and also decide if it is （un）stable. The EAC method and the angle criterion were both applied in the contingency screening，and the effectiveness of EAC method was evaluated. The results of two simulations on different systems，indicate that the EAC method could reduce the transient stability computation time.
Key words： time-domain simulation；transient stability criterion；contingency screening；single machine equivalent（SIME）；one machine infinite bus（OMIB）；EAC