A Method to Optimize Parameters of the Hydraulic Turbine Governor With Satisfactory Control

Proportion-integration-differentiation(PID) parameters optimization of the hydro-turbine governor is an everlasting topic.Currently most studies focus on the parameter design based on optimal theories.A new method of parameters optimization was put forward according to the satisfactory degree of performance indices of hydro-turbine speed.Performance indices,such as rise time,overshoot,settling time and steady-state error of system response,were directly measured,so as to obtain satisfactory degree function of each index.Taking the total satisfactory degree value as fitness function to optimize parameters with genetic algorithm(GA),the PID parameters meeting design demands were obtained.The design aim of the proposed method is more practicable and workable.The parameters obtained,though not be optimal,can meet demands of system response and be more practical with lower cost.This method was applied to designing PID parameters of linear and nonlinear non-elastic water models of the hydraulic system,and simulation results proved the effectiveness and usefulness of satisfactory control in optimizing parameters of the hydro turbine governor.