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Stochastic prediction of voltage sags in a large transmission system

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3 Author(s)
Qader, M.R. ; Centre for Electr. Energy, Univ. of Manchester Inst. of Sci. & Technol., UK ; Bollen, M.H.J. ; Allan, R.N.

This paper discusses two stochastic prediction methods for voltage sags and applies them to a 97-bus model of the 400 kV National Grid of England and Wales. The method of fault positions is most suitable for implementation in a software tool. It has been used to get exposed areas and sag frequencies for each bus. The results are presented in different ways, including a so-called voltage sag map showing the variation of the sag frequency through the network. The method of critical distances is more suitable for hand calculations, as both the amount of data and the complexity of the calculations are very limited. It has been used to obtain sag frequencies for a number of buses. A comparison with the results obtained by using the method of fault positions shows that the method of critical distances is an acceptable alternative where software or system data are not available for a more accurate analysis

Published in:

Industry Applications, IEEE Transactions on  (Volume:35 ,  Issue: 1 )

Date of Publication:

Jan/Feb 1999

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