Ancheng Xue, Chen Shen, S. Mei, Y. Ni, F. Wu, Q. Lu
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A new transient stability index of power systems based on theory of stability region and its applications
This paper presents a new transient stability index based on the implicit expression of the stability region of the power system related to the controlling unstable equilibrium point, and then gives out an estimation of the index with the quadratic approximation of stability region. Two applications of the proposed index, calculating the critical clearing time (CCT) incorporating the curve fitting approach and contingency ranking are discussed. Simulations in IEEE 3-machine 9-bus system and 10-machine 39-bus New England system show the effectiveness of the proposed index
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