derivative input

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Zakky Anshary
Zakky Anshary 2011-11-10
<hi mathworkers... i'm making simulation of power system using fuzzy logic controller... the fuzzy system made using embbeded matlab...
the simulation stopped at time 2.375.
it said : "Derivative input 1 of 'contoh_simulasi_fuzzy_sistem_fuzzy/EH converter' at time 2.375 is Inf or NaN. Stopping simulation. There may be a singularity in the solution. If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances)."
i don't know how to solve it.. can you tell me how to solve the problem?
thank you
the simulink block system is in the link...
> http://imageshack.us/photo/my-images/338/captureafu.jpg/

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回答（1 个）

Guy Rouleau
Guy Rouleau 2011-11-11
Try what the error message says:
- If the model is fixed step, try reducing the step size - Try changing the solver tolerance.
However this might very likely be because your controller is unstable and goes to infinity!

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