.Modelica.Electrical.Analog.Examples.Lines.SmoothStep

Information

This example shows a comparison of a multi-segment OLine model with the distributed-parameter line model TLine.

If resistances and conductances are negligible, with OLine the results should become closer and closer as the number of segments increases.

Suggested tests:

Steep step

Use the model as it is (it has firstOrder.T=1e-9 s) and compare R1.v, R5.v, R50.v, Rdistr.v: Rdistr.v is the ideal voltage of the receiving-end resistor for a lossless line, while the others are approximations with 1, 5, 50 cascaded segment models.

The step in this case is nearly ideal, and therefore is a very tough test for cascaded segments, and in fact they are not very good in approximating the real line behaviour.

Smoother step

Repeat the simulation using firstOrder.T=20e-6 s. You will see that the OLine compliance with the reference result given by TLine is much better, and 50 segments are probably adequate for several applications; in comparison with, they add the option of evaluating losses.

Revisions

• May, 2021 implemented by Massimo Ceraolo, University of Pisa