Modelling of tap-changer transformers in an energy management system

Author

Imhof, K. ; Oesch, F. ; Nordanlycke, I.

Author_Institution

ABB Netcom AG, Turgi, Switzerland

Volume

11

Issue

1

fYear

1996

fDate

2/1/1996 12:00:00 AM

Firstpage

428

Lastpage

434

Abstract

Tap-changer transformers are used in a power system to influence the voltage profile as well as the distribution of power flow. The coupling of the two transformers-the main transformer and the tap transformer-establishes a complex power system element. The correct modelling of this device has turned out to be critical for the accurate estimation and calculation of the power system state. This paper introduces an improved model which simulates the behaviour at the different tap positions and loading conditions. The paper focuses on the positive sequence system of a regulated connected group consisting of a three-winding main transformer and a two-winding tap-changer transformer. Model verification against test reports and experiences gained from using the new model in an EMS are documented

Keywords

load flow; load management; parameter estimation; power system analysis computing; power system state estimation; power transformers; transformer windings; EMS; computer simulation; energy management system; model verification; positive sequence system; power flow distribution; power system state estimates; tap-changer transformers; voltage profile; windings; Character generation; Energy management; Equivalent circuits; Impedance; Load flow; Medical services; Power system management; Power system modeling; System testing; Transformers;

fLanguage

English

Journal_Title

Power Systems, IEEE Transactions on

Publisher

ieee

ISSN

0885-8950

Type

jour

DOI

10.1109/59.486129

Filename

486129