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A BCU method for direct analysis of power system transient stability

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3 Author(s)
Hsiao-Dong Chiang ; Sch. of Electr. Eng., Cornell Univ., Ithaca, NY, USA ; Wu, F.F. ; Varaiya, P.P.

A boundary of stability region based controlling unstable equilibrium point method (BCU method) for direct analysis of power system transient stability is presented. Features distinguishing the BCU method from the existing direct methods are that it consistently finds the exact controlling unstable equilibrium point (UEP) relative to a fault-on trajectory and that it has a sound theoretical basis. Moreover, the BCU method appears to be fast. This method is based on the relationship between the boundary of stability region of a power system and that of a reduced system. The BCU method finds the controlling UEP of the original system via a reduced system whose controlling UEP is easier and cheaper to compute. Effective numerical schemes to speed up the presented method are also proposed. This method has been tested on several power systems with very promising results. Simulation results on a 50 generator, 145 bus system are presented along with a comparison between the results obtained using the BCU method and another existing method

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Power Systems, IEEE Transactions on  (Volume:9 ,  Issue: 3 )