In this paper, a switching-type PD-PI controller (SWPD-PI) is proposed and a parameter selection method based on a hybrid evolution algorithm (HEA) is used to select the control parameters effectively for an automatic voltage regulator (AVR) system. The proposed switching-type PD-PI control structure combines improved transient response and reduction of steady state error to produce good global response. In the selections of parameters, HEA is applied to select an appropriate switching value and the control parameters in PD and PI controllers so that the controlled system may have good performance. In the selection of the fitness function, a new evaluation method for system performance is applied so that evolution algorithms can effectively find an appropriate parameter set. Finally, the proposed method is applied in the AVR system. From some simulation and comparison results, we can see that the proposed parameter selection method can effectively find a parameter set for the proposed switching-type PD-PI controller to yield better control performance.
Journal of the Chinese Institute of Engineers 37(5), pp.687-697