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Characteristic of voltage dips (sags) in power systems

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2 Author(s)
Lidong Zhan ; Dept. of Electr. Power Eng., Chalmers Univ. of Technol., Goteborg, Sweden ; Bollen, M.H.J.

This paper analyzes the characteristic of voltage dips in power systems with special emphasis on unbalanced dips and electrical components analysis. A generalized dip model is built for all unbalanced dips, taking into account the fault types, transformer types and load connections. It shows the transformation for different types of unbalanced dips. The characterization results in a so-called remaining complex voltage (a generalized magnitude phase angle shift) for balanced and unbalanced dips as well as a factor, related to the rotating machine contribution to the source impedance for unbalanced dips. It is shown that the factor is close to unity, so that both balanced and unbalanced dips can be characterized with one phaser

Published in:

Power Delivery, IEEE Transactions on  (Volume:15 ,  Issue: 2 )

Date of Publication:

Apr 2000

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