PID controller, difference when graphing step function with PID control block in matlab and simulink
55 views (last 30 days)
Show older comments
hoang
on 2 Jul 2024 at 2:55
Commented: Sam Chak
on 3 Jul 2024 at 6:03
Hi everyone,
please tell me, why is there a difference when graphing step function with PID control block in matlab and simulink
s =tf('s');
g = 1.883e5/(s*(s^2+4466*s+6.43e6));
kp = 60;
ki = 63000;
kd = 3;
gpid = pid(kp,ki,kd);
gsys = feedback(g*gpid,1);
step(gsys)
0 Comments
Accepted Answer
Sam Chak
on 2 Jul 2024 at 4:16
Hi @hoang
Both responses look similar if you implement them correctly as shown.
s = tf('s');
Gp = 1.883e5/(s^2 + 4466*s + 6.43e6);
kp = 60;
ki = 63000;
kd = 3;
Gc = pid(kp, ki, kd);
Gcl = feedback(Gc*Gp, 1);
step(Gcl), grid on, ylim([-0.1, 1.1])
6 Comments
Sam Chak
on 3 Jul 2024 at 6:03
Hi @hoang
I'm glad to hear that. If you find the explanation and code helpful, please consider clicking 'Accept' ✔️ on my Answer. Additionally, you can show your appreciation by voting 👍 for other answers by Paul and Umar as a token of support for their knowledge sharing. Your support is greatly appreciated!
More Answers (2)
Paul
on 2 Jul 2024 at 3:28
Hi hoang,
The posted code doesn't result in the same figure as in the question
s =tf('s');
g = 1.883e5/(s*(s^2+4466*s+6.43e6))
kp = 60;
ki = 63000;
kd = 3;
gpid = pid(kp,ki,kd);
gsys = feedback(g*gpid,1);
step(gsys)
Note also that g in the Matlab code has an integrator in the denominator that is not present in the plant model in the Simulink diagram.
What is inside the subsystem block in the Simulink diaggram?
2 Comments
Umar
on 2 Jul 2024 at 3:00
Hi Hoang,
My suggestion would be tuning the PID controller gains appropriately. You can use tools like the PID Tuner in Simulink or MATLAB's Control System Toolbox to adjust the controller parameters for better system performance. Try using the pidtune function to tune the PID controller. For more information regarding this function, please refer to
https://www.mathworks.com/help/control/ref/dynamicsystem.pidtune.html
Let me know if you need further assistance.
0 Comments
See Also
Categories
Find more on Gain Scheduling in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!