PID Tune: Plant cannot be linearized. Why?
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Hello everyone,
I'm using simulink for simulating a cooling system. When I try to use the tune button on the PID it opens the tuning window and say:
Plant cannot be linearized.
Why is this happening?
The PID is doing is job. I've attached files.
Thank you very much for the help,
Norman
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Arkadiy Turevskiy
2014-6-18
5 个投票
The plant is linearized, but the linearization at t=0 is a gain of zero. Most likely this happens due to initial conditions in the model. You can ask the PID Tuner to linearize the model at a simulation snapshot of say t/2, when everything comes to steady state.
When you do that, the PID Tuner successfully linearizes the model and designs a PID controller.
Here are the snapshots of the steps using R2014a.
更多回答（1 个）
Norman
2014-6-19
1 个投票
7 个评论
Arkadiy Turevskiy
2014-6-19
Try setting simulation time to 3600 instead of t, as you have now. When I tried your model yesterday, somehow using t instead of a number for specifying simulation time was causing PID Tuner some trouble. This is a bug that will be fixed. Meanwhile, just type in 3600 and everything should work.
Norman
2014-6-19
Adhip Shukla
2019-11-16
Hi Arkadiy,
In my model also it is showing the same error and I tried what you have suggested above can you look into my model once and tell me how to tune my PID block.
Ayesha Sandamali
2020-11-12
I am designing a grid connected PV system. In that model I am using three PI controllers inorder to control iq, id and output dc voltage of the solar array. Can suggest any methods to tune these controllers.
mohamed farouk boukli hacene
2020-12-23
@ayesha sandamali i'm working on a pv inverter control too and a pv optimizer so i need exactly what you're asking for, did you find the answer? thank you
Sharjeel Khan
2020-12-25
@Ayesha Sandamali i'm also simulating and grid connected PV system. I'm also facing the same problem can you help me with that please??
Yashas S V
2021-6-21
Did you guys find anything? Please let me know if you find anything. Thanks in advance. (mail ID: ee18b040@iittp.ac.in)
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