PID Controller in Simulink question

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Manikanta Aditya
Manikanta Aditya 2023-7-22
评论： Manikanta Aditya 2023-7-23
Can i apply a series of values as Kp Ki and Kd values instead of just one single value. Like lets say it starts from 1,2,3.. and after the last value it stays at that value till end of simulation.

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Paul
Paul 2023-7-22
Set the 'Source' parameter to 'external' as in doc for PID block. The you can calculate the gains external to the block as functions of time however is needed and feed the gain values into the block as inputs.
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Sam Chak
Sam Chak 2023-7-23
Ran in:
I see now, you are not using Simulink. So you want to hold the last value of each gain?
But I think that the pid() function does not accept time-varying parameters. However, you can possibly use the time-sampling approach or event-triggered method to update PID controller
kp_values = [1, 2, 3, 4, 5];
ki_values = [4, 5, 6, 7, 8];
kd_values = [7, 8, 9, 10, 11];
kp_values(end)
ans = 5
ki_values(end)
ans = 8
kd_values(end)
ans = 11
pid_controller = pid(kp_values(end), ki_values(end), kd_values(end))
pid_controller = 1 Kp + Ki * --- + Kd * s s with Kp = 5, Ki = 8, Kd = 11 Continuous-time PID controller in parallel form.

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Sam Chak
Sam Chak 2023-7-23
Hi @Manikanta Aditya
If you set the PID controller block to have external inputs for the control gains as advised by @Paul, then the configuration should look like the following block diagram. However, I'm unsure how you intend to set up the filtered derivative, since yours has only Kd.

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