MATLAB: Does the Surge Arrester block make the SimPowerSystems simulation unstable

Simscape Electrical

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?

Best Answer

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.

Related Solutions

MATLAB: How the series of 2 stable discrete-systems becomes unstable

I think you are seeing some roundoff or other numerical issues. Higher order polynomials (in your case a 5th order polynomial) are notorious for having behavior that is very sensitive to coefficient values. The poles of your original two transfer functions are already close to zero. I think you also may have a problem in your HP4 in that the zeros and poles are all very close to 1, basically you have very close (Z-1)^4/(Z-1)^4 so the near pole zero cancellation may also be causing you numerical issues.

I would recommend looking more closely at you filter design, do you really want the zeros and poles to be nearly identical?

Also for future reference you can much more simply define your second transfer function using:

HP4 = tf([B1 B2 B3 B4 B5],[A1 A2 A3 A4 A5],tECU)

rather than expanding the polynomial yourself

MATLAB: I want to construct the model attached with this question using simulink. In that it contains coupled inductors. Can any help me to draw that coupled inductors using simulink.

this is the fig

Best Answer

Related Solutions

MATLAB: How the series of 2 stable discrete-systems becomes unstable

MATLAB: I want to construct the model attached with this question using simulink. In that it contains coupled inductors. Can any help me to draw that coupled inductors using simulink.

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