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The block computed at time is Inf or NaN.

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best regards. I simulate on simulink of matlab2015a, a model that reached t = 11S, and then the simulation stopped, displaying the following error:
An error occurred while running the simulation and the simulation was terminated Algebraic state in algebraic loop containing 'SAID/FCV Electrical Subsystem/PM Synchronous Motor Drive This block is based on the AC6 drive block/Subsystem/VECT Controller/DQ-ABC/ic' computed at time 11.978520000000001 is Inf or NaN. There may be a singularity in the solution. If the model is correct, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances)
I know this is an error that stopped the execution of the simulation. Algebraic state at a given instant is Infinite or indeterminate.
so the solution given by the matlab message is to try to reduce the size of the step. I do not know how and where?
to reduce the size of the fixed step size, or the error tolerances, what parameters must we access? thank you. cordially.

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Accepted Answer

Walter Roberson
Walter Roberson on 4 Jun 2018
Usually reducing the step size ends up not resolving the problem, which is typically due to there being a singularity in the ODEs that are needed to resolve the connections between the components.
Sometimes what you need to do is switch to a "stiff" solver (or away from one)

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said belhadj
said belhadj on 5 Jun 2018
Hello MR. ROBERSON. Thank you for your reply and help. Cordialy. S. BELHADJ.

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