How to configure overhead line and cable models for EMT simulations?

Dynamic Simulation

The following models are available in PowerFactory (see attachment):

  • Lumped PI model
  • Distributed Constant Parameter, also known as Bergeron model
  • Distributed Frequency Dependent Parameter Modal Domain model, also known as J. Marti model
  • Distributed Frequency Dependent Phase Domain model, also known as universal line model (ULM)

The cable and overhead lines systems can either be modeled based on a TypLne or geometric line model (TypTow, TypGe, TypCabsys). For EMT simulations it is generally recommended to use a geometric model. The lumped PI model are only suitable some transients, where the distributed character of the line is not important.

The line model is configured on the "Basic Data" page of the line element (ElmLne, ElmTow or ElmCabsys). Here you can choose:

  • Lumped Parameter (PI)
  • Distributed Parameter

If you select "Distributed Parameter" you have to configure the corresponding model on the "EMT-Simultion" page. On the EMT page you define:

  • Type of distributed parameter model (available models are listed above)
  • Main frequency of transient for modal domain models
  • Frequency range for frequency dependent model

Once you configured the distributed parameter line model you have to press the button "Calculate Line Parameters" in order to create the model for the EMT simulation.

In the attached project there is a Python script that can be used to configure all lines automatically.