Title :
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
fDate :
2/1/1996 12:00:00 AM
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;
Journal_Title :
Power Systems, IEEE Transactions on
