How we get Tuning parameters(Kp,Ki,Kd) of PID controller from bode plot with the help of Matlab? Hints: Transfer function of the system is given.
From bode plot, you can get G(s)C(s) transfer function. As, you know G(s), plant transfer function. You can get C(s) transfer function. From C(s) transfer function, fetch the values of controller parameters.
Hope, this will work for you.
Dear Bikas,
You can get G(s)H(s) from bode plot. Please find an attachment for the same.
Also, you can refer the book, Linear control system by Manke, page no 314
http://web.mit.edu/2.010/www/2010SpPS10Soln.pdf
https://www.youtube.com/watch?v=xT-4EIraF38
Controller tuning based on Bode Stability criterion:
· Put Gc=Kc (P-only controller) and Obtain GoL (Open loop transfer function, GcGvGpGm)
· Get amplitude ratio AR and phase lag Phi from frequency response analysis
· Obtain the cross over frequency, wc when ( Phi =-180 degrees)
· Get ultimate gain Kcu = 1/AR at wc and ultimate period Pu = 2pi/wc
· Now use Z-N settings for calculating the controller parameters (Kc, TauI, TauD )
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