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not allowing me use pid tunes

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arash rad
arash rad 2019-6-6
回答： Raj 2019-6-6
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

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Raj
Raj 2019-6-6
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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