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Voltage stability evaluation using modal analysis

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3 Author(s)
Gao, B. ; Ontario Hydro, Ont., Canada ; Morison, G.K. ; Kundur, P.

The authors discuss the voltage stability analysis of large power systems by using a modal analysis technique. The method computes, using a steady-state system model, a specified number of the smallest eigenvalues and the associated eigenvectors of a reduced Jacobian matrix. The eigenvalues, each of which is associated with a mode of voltage/reactive power variation, provide a relative measure of proximity to voltage instability. The eigenvectors are used to describe the mode shape and to provide information about the network elements and generators which participate in each mode. A simultaneous iteration method, which is well suited to applications involving large power systems, is used for selective calculation of appropriate eigenvalues. Results obtained using a 3700 bus test system are presented illustrating the applicability of the approach

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Power Systems, IEEE Transactions on  (Volume:7 ,  Issue: 4 )