Abstract
This paper introduces a new approach to obtain the generator rotor angle difference in the multi-machine power system for transient stability studies. It aims to replace the center of inertia (COI) for on-line transient stability assessment. Compared with COI, the proposed method can give more reasonable estimations of rotor angle difference between the individual generator and the multi-machine power system. In addition, it allows generators to have their own references for evaluating transient stability, which is more reasonable and accurate than using COI. Moreover, the proposed technique calculates the rotor angle difference by using the local generator's active and reactive power output. This does not add any extra burden to the communication channel.
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