good morning,

You try to use genetic algorithm to find the parameters of your controller using a given criteria (stability and/or tracking and/or static error ….).

If you are using Matlab : try this ,

Help gaoptimset

Help ga

I can send you an Example if you find some difficulties.

Best regard

Thanks Ali sir for your answer, Actually i have seen that help (gaoptimset and ga).

I want to find the controller parameters for tracking the desired signal. I have used gaoptimset and find the parameters, for nonlinear contraints also. but in this controller tracking performance problem, I am not able to find the method that can be used with ode solver. suppose state x, desired signal yd and error e=x-yd.

and controller parameter is k (-k*e). ode solver in matlab is used to find the states and plot the error signal where k is find by trialand error basis. Kindly provide the example so that i can understand the things properly. Thanks

Good morning;

please find in the attachment an exemple

I put some comment in the program

you have just to run 'exemplegafun.m' .

good luck

Thanks Ali Sir for your efforts and support for the problem of PI controller parameters finding. Sir I have used signal constraint block of simulink design optimization toolbox for finding kp, ki and kd in the case of PID controller.

In my case, I am using m-file program of nonlinear system where transfer function is not possible, so I have to use ODE (ordinary differential equation ) solver to find the states and error. In that part i am unable to solve and finding the controller parameters. Have you solved any such kind of problem for nonlinear system that would be a really great help. Thanks

You can use any method ODE, matlab code, C code or simulink model. Make sure that you know what your inputs are. Let us say you want a step response of you closed loop system to match a second order system response of desired damping etc. Make you input waveform and get your approximation output. Now the closed loop system should match this behavour, Subtract the closed loop system response and the desired response and take norm. THis has to be minimised by tuning your gains. Use any method, GA, fminsearch etc. Works most of the time. Prayer helps :-)