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

Author

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

Author_Institution

Nordostschweizerische Krafrwerke AG, Baden, Switzerland

fYear

1995

fDate

7-12 May 1995

Firstpage

372

Lastpage

377

Abstract

In real three-phase power systems, the 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

digital simulation; electrical faults; load flow; power system analysis computing; power system harmonics; power system stability; power transformers; computer simulation; fault analysis; harmonics; linear incremental calculation; multiple unbalanced fault; power flow; reactances; software; steady-state unbalanced conditions; three-phase power systems; transformer bank; 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

Publisher

ieee

Conference_Titel

Power Industry Computer Application Conference, 1995. Conference Proceedings., 1995 IEEE

Conference_Location

Salt Lake City, UT

Print_ISBN

0-7803-2663-6

Type

conf

DOI

10.1109/PICA.1995.515209

Filename

515209