The output of my PID controller is coming very high...

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Kaushal Tiwari
Kaushal Tiwari on 26 Sep 2017
Answered: Kaushal Tiwari on 27 Sep 2017
The output of my PID controller is coming as high as -10e15. What could be the possible reason and how to limit it????
Thanking you in advance...

Answers (2)

Christoph F.
Christoph F. on 26 Sep 2017
Edited: Christoph F. on 26 Sep 2017
Without more information, perhaps the simulink diagram, the question will be difficult to answer.
In general, PID controllers will produce high outputs if:
1) P coefficient > 0 and the input value is high
2) D coefficient > 0 and the input signal has steep slopes
3) I coefficient > 0 and the average control error does not approach zero over time; i.e. the integrator just keeps integrating up the error.
3) can be remedied by anti-integrator-windup measures (there are several approaches with different complexities and side effects. I believe the Simulink PID controller block does offer this as a built-in feature.

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