derivative input

<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/

Answer 1

[Guy Rouleau]

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!