Abstract—This paper presents a new method for analyzing transient stability of a faulted two-machine system. This method uses a set of closed loop transfer function for each machine and derives the dominant root by taking Laplace transformation of the machine’s nonlinear equation. A three-phase fault is considered near bus 4 on the line 4-5 and the system has been studied by the proposed method. This system is again studied by the CYME power system simulation software at different fault clearing times of 0.05, 0.07, 0.10, 0.15 and 0.225 seconds respectively, after disconnecting the line 4-5. The results obtained by the proposed method have been compared with the results obtained by simulation. It has been found that the two-machine system is stable for the first four fault clearing times while it is unstable for the fault clearing time of 0.225 seconds.

Index Terms—transient stability analysis, CYME software, fault clearing time, stable, unstable second

Cite: M. A. Salam, Nabilah S. Awang, and Quazi M. Rahman, "Transient Stability Analysis of a Two-Machine Power System under Different Fault Clearing Times," International Journal of Electronics and Electrical Engineering, Vol. 3, No. 1, pp. 28-33, February 2015. doi: 10.12720/ijeee.3.1.28-33