A Study of the Bifurcation in Hydraulic Generator Unit Intelligent PID Control System

A nonlinear dynamical model of hydraulic generator unit is presented, which can be analyzed by the bifurcation theory of nonlinear differential equations and simulated in computer. By using the genetic algorithm, the PID parameters of hydraulic generator unit intelligent system are optimized and the control performances are improved. The algebra criterion about the existence of bifurcation is employed to study the bifurcation behavior of the nonlinear model which takes the PID parameters as the bifurcation ones. The simulations show that a supercritical bifurcation is likely to exist in hydraulic generator unit system and the bifurcation will occur for the higher values of PID parameters. The results of this paper can be considered as good suggest for intelligent PID control system of hydraulic generator unit.