How to build PID controller on command Line

Question

Bahar Ebru 2022-6-26

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1748475-how-to-build-pid-controller-on-command-line

回答： Sam Chak 2022-6-27

Hello, I'm trying to find and built a PID system.But it gets error.I have to find,reponse time,steady stae error,overshot from Kp,Ki,Td.Function I have to work with is (1/s^2+10s+20).

Tune controller is in this sequence;

1.Only P element

2.Enable D, and returne P

3.Enable I and retune P,D.

And I have to plot, P,I,D,PI,PD,PID, bode and nyquist graphs.

P=4;
bode(P)
I=tf([1],[5]);
bode(I);
D=9;
bode(D);
sys=tf([270 50 1],[225 5 0])
[C_pi,info]=pidtune(sys,'PI')
[C_p,info]=pidtune(sys,'P')
bode(sys)
nyquist(sys)
[C_PD,info]=pidtune(syz,'PID')

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Answer 1

Sam Chak 2022-6-27

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https://ww2.mathworks.cn/matlabcentral/answers/1748475-how-to-build-pid-controller-on-command-line#answer_994175

在 MATLAB Online 中打开

Hi @Bahar Ebru

Not exactly sure what you are trying to do (your description and code are not tally). After checking the documentation, I think you can try something like this:

% Plant

Gp = tf(1, [1 10 20])

Gp = 1 --------------- s^2 + 10 s + 20 Continuous-time transfer function.

% Compensator

[Gc, info] = pidtune(Gp, 'PID')

Gc = 1 Kp + Ki * --- + Kd * s s with Kp = 39.3, Ki = 116, Kd = 3.33 Continuous-time PID controller in parallel form.

info = struct with fields:

Stable: 1 CrossoverFrequency: 4.1614 PhaseMargin: 74.0404

% Closed-loop system

Gcl = feedback(Gc*Gp, 1);

Gcl = minreal(Gcl)

Gcl = 3.326 s^2 + 39.27 s + 115.9 --------------------------------- s^3 + 13.33 s^2 + 59.27 s + 115.9 Continuous-time transfer function.