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Estimation of steady-state unbalanced system conditions combining conventional power flow and fault analysis software

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3 Author(s)
Reichelt, D. ; Nordostschweizerisch Kraftwerke AG, Baden, Switzerland ; Ecknauer, E. ; Glavitsch, H.

In real three-phase power systems, their voltages and currents are not fully symmetrical. A method has been developed to estimate the effects of slight unbalanced network conditions for steady-state operation. A conventional power flow is followed by a linear incremental calculation using a three-phase model of the network. The unbalanced condition is handled like a multiple unbalanced fault. The process is illustrated for the case of a transformer bank with nonidentical single-phase units. The results show the effects of different transformer reactances and different voltage ratios, respectively

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Power Systems, IEEE Transactions on  (Volume:11 ,  Issue: 1 )