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A simple approach to voltage stability assessment in radial networks

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2 Author(s)
Gubina, F. ; Ljubljana Univ., Slovenia ; Strmcnik, B.

Analytical approach to voltage collapse proximity determination is proposed for radial networks. Under corresponding assumptions, a radial network with arbitrary bus loads is transformed into a two bus equivalent. The voltage phasors at the generator bus and at the last load bus of the radial network are transformed to form the voltage phasors of the two bus equivalent. The latter are further used for assessment of voltage collapse proximity. Exact stability limit relations for a two bus system derived from Jacobian matrix can be exploited. Moreover, an analytical expression is derived for calculation of active and reactive power reserve margins for a radial network equivalent. The proposed procedure has been tested for practical examples of radial networks with inductive and capacitive loads

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Power Systems, IEEE Transactions on  (Volume:12 ,  Issue: 3 )