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

Author

Reichelt, D. ; Ecknauer, E. ; Glavitsch, H.

Author_Institution

Nordostschweizerisch Kraftwerke AG, Baden, Switzerland

Volume

11

Issue

1

fYear

1996

fDate

2/1/1996 12:00:00 AM

Firstpage

422

Lastpage

427

Abstract

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

Keywords

electrical faults; load flow; power system analysis computing; power system stability; power transformers; software packages; computer simulation; fault analysis software; linear incremental calculation; multiple unbalanced fault; steady-state unbalance; three-phase model; three-phase power system; transformer bank; transformer reactance; unbalanced power flow; voltage ratios; Circuit faults; Conductors; Load flow; Power system analysis computing; Power system faults; Power system modeling; Power system planning; Power system simulation; Steady-state; Voltage;

fLanguage

English

Journal_Title

Power Systems, IEEE Transactions on

Publisher

ieee

ISSN

0885-8950

Type

jour

DOI

10.1109/59.486128

Filename

486128