Abstract:

A controller for the on-line tuning of PID(Proportional-Integral-Derivative)parameters based on the sa-tisfactory degree and genetic algorithm is proposed.With the theory of satisfactory solution,the satisfactory func-tions of over-shoot,rise time and setting time of the system response are designed,and the three parameters k_p,k_iand k_d of the PID controller are obtained by means of gaenetic algorithm.These three parameters are used as the base values for the on-line tuning of PID parameters.Then,by designing the nexus functions between the tracking error and k_p,k_i,k_d,the PID controller parameters are adjusted online,thus improving the static performance,dy-namic perform ance and robust perform ance of the control system.The results of Matlab simulation show that the proposed PID controller is valid.

Key words: PID controller, satisfactory degree, genetic algorithm, intelligent contro