Hello Hema,

These links will help you.

http://ctms.engin.umich.edu/CTMS/index.php?example=Introduction§ion=ControlPID

http://www.facstaff.bucknell.edu/mastascu/econtrolhtml/PID/PID3.html

There are some tabulated methods, look for Ziegler-Nichols. See link below.

http://www.engr.mun.ca/~nick/eng5951/Ziegler_Nichols.pdf

Pls see this link

http://www.ie.itcr.ac.cr/einteriano/control/clase/Zomorrodi_Shahrokhi_PID_Tunning_Comparison.pdf

In my opinion, for a certain plant, we can find the PID parameters by minimizing different indices using say, genetic algorithm, then we select the set of parameters that gives the best closed-loop response.

All methods are valuable, but if you have process model, pole placement procedure, can ensure good performance. For pole placement you can use e.g. Ioan Doree Landau books and papers (RST controller in PID representation).

There are some wind-up modellings for PID Regulators

Madam Hema Ramachandran ,

It is very interesting question. There are several techniques to design PID controller. For changing of Kp, Ki, Kd permutation-ally creating the effect of system transient responses.    Firstly,  Determination of proper Controller is very impotent. You may go through with my paper http://www.ijsrp.org/research-paper-0812/ijsrp-p0823.pdf  Table 1 (Tuning effect ). To chose perfect controller  . After that, the actual value setting consideration of theses Gains, you first try traditional ZN, CC etc. different method then you try for advanced computational technological method (PSO,GA, BF etc). every case you determine the output responses and calculate the several errors. In which case the error is minimum, set that Controller as a perfect controller. You get total MATLAB code in this paper http://www.ijsrp.org/research-paper-0812/ijsrp-p0823.pdf ....I hope it may helpful to you......  Thank you...

You can use a genetic algorithm to find optimal PID controller

Dear, you can use PSO algorithm to design PID.