Why does the Surge Arrester block make my SimPowerSystems simulation unstable?

The “Surge Arrester” block makes my SimPowerSystems simulation unstable.

According to the documentation, this is a very highly nonlinear block.

What can I try to improve the stability of this simulation? 

Answer 1

[MathWorks Support Team]

This issue can be caused by the "Break algebraic loop " option in the parameters of the Surge Arrester.

Here is what the documentation states about this option.

"You should be aware that disabling the algebraic loop introduces a one-simulation-step time delay in the model. This can cause numerical oscillations if the sample time is too large. "

In some case, breaking the loop makes the model unstable.

Please unchek this option to run the simulation properly.