DIgSILENT
PowerFactory
Application Example
Transmission System
Load Flow Analysis
1 Description
The example system describes a 225/90 kV transmission system. Loads are distributed
throughout the network, but mainly concentrated at the 90 kV substations. Power plants are
connected via step-up transformers to both 225 and 90 kV substations. Long 225 kV
transmission lines are compensated with line reactors and some loads are shunt
compensated. Two wind turbine groups are also considered (East and West).
Study case number 01 which is linked to the High Load operation scenario refers to this
simulation. The two variations defining the wind parks are active (“Stage 1 WPEast” is set as
recording). A boundary is defined in order to monitor the flow from the 275 kV corridor.
The base conditions for the power flow simulations are:

All generators are connected

Gen_S2 generator set as reference machine

Station controllers defined for power plants S11, S2 and S4 so that they control the
voltage at one of their substation terminal
2 PowerFactory Project Information
Name of Project: Transmission_Example
Name of Study Case: 01_Low Flow (High Load)
Transmission System - Load Flow Analysis
1
DIgSILENT GmbH
Heinrich-Hertz-Strasse 9
D-72810 Gomaringen
Tel.: +49 7072 9168 - 0
Fax: +49 7072 9168 - 88
http://www.digsilent.de
e-mail: mail@digsilent.de
Transmission System - Load Flow
Analysis
Published by
DIgSILENT GmbH, Germany
Copyright 2013. All rights
reserved. Unauthorised copying
or publishing of this or any part
of this document is prohibited.
Doc. Rev. No. 2,
18 April 2013
Transmission System - Load Flow Analysis
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