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

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...

[baosen zhao]

我的想法是在实际的热工对象控制中，如果有很高的PID控制器输出，直接就切断PID的控制，此时相当于给系统一个负阶越响应，PID的控制器降至合理的区间就会继续打开PID的控制

Answer 1

[Christoph F.]

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.

Answer 2

[Kaushal Tiwari]

Thank you for the answer... I would like to attach my Simulink file...