How can I fix propagation speed error using Simscape Power System?

I’m running 2017b, using a model I think was created in 2015x. When I try to run the model, I receive the following error:

“A propagation speed of...has been found for Mode 1 Block 10. Propagation speed must be < 300000 km/s.”

Analysis of the model forms part of a university coursework, and I can’t see anything obvious to change to allow it to run correctly. Thanks.

[Ha Le]

If the Block that produces the "Propagation speed" error is PI line section, you can try to adjust the line LC parameters according to the theory of "Three-Phase PI Section Line" and "PI Section Line" (described in MATLAB Help) to bring the propagation speed under 300000 km/s. Another approach is to delete the PI line section and replace it with a large resistive load connected in parallel (e.g. 5MW). This solves the "propagation speed" error message. However, the disadvantage is that you cannot use the PI line section.

[kalim ullah]

I am facing the same problem, and not even able to adjust it by adjusting LC parameters of PI line. What I should do? please suggest

[Steve Miller]

Can you share the model?

--Steve

Answer 1

[Tarun Sangwan]

propogation time=distance/propagation speed(commonly reffered to speed of light)

if there is propagation error you must check value for positive and negative sequence inductance.

try making it greater than 1

Answer 2

[Prasanth Sunkara]

Hello Euan,

It seems to be an "improper" configuration of the Simscape TL blocks.

The error message you see from the model is due to propagation speeds larger than 300000 km/s, which is causing the propagation time to be smaller than the sample time. Please refer to the following links to understand more about the parameters and block equations for Distributed Parameter Line and PI Section Line:

http://www.mathworks.com/help/physmod/sps/powersys/ref/distributedparameterline.html

http://www.mathworks.com/help/physmod/sps/powersys/ref/pisectionline.html

- Prasanth