not allowing me use pid tunes
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Hi
please help me
I have an tf i need PID contoller for it and I must use sisotool .
when i open PID tunnig in sisotool and click on update compensator it gives me an error i've never seen .
please help
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/223253/image.png)
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Respuestas (1)
Raj
el 6 de Jun. de 2019
Why don't you compute the closed-loop transfer function (with a PID controller) and then apply Routh's criterion. It will tell you whether you will be able to stabilize your system with a PID controller. In case, as the 'sisotool' tool error says, PID controller is not able to stabilize the system (no combination of Kp,Kd,Ki is making all the roots stable) then I would recommend switching to other control methods like LQR.
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