Research On Optimization Of Control Parameters Of Speed Regulation System Of Hydroelectric Unit

The hydraulic turbine regulating system is a complex control system which integrates hydraulic,mechanical and electrical,and has an important impact on the safe and stable operation of the hydropower station.The adjustable PID parameters of governor are the key factors that affect the regulation performance of the unit,so the optimization of PID parameters of governor has become a hot issue.In order to solve the problem of PID parameter optimization of turbine governor,this paper introduces the seeker optimization algorithm into turbine governor system,and provides a new idea and method for PID parameter setting and optimization of governor.In this paper,the hydraulic turbine governing system is divided into four subsystems: hydraulic system,hydraulic turbine,governor and generator.The basic models of the four subsystems are introduced,and then a fourth-order differential equation model is constructed and derived.Based on the Hopf bifurcation theory and mathematical knowledge,the PID parameters of the governor are taken as the bifurcation parameters,and the bifurcation phenomena of the system under frequency disturbance and load disturbance are studied and analyzed.Through the simulation analysis of the hydraulic turbine governing system,it is found that the system is subcritical,and the stability region of PID control parameters of the governor is obtained.On this basis,taking the integral time absolute error index of the speed deviation of the hydro-generator set as the objective function,the seeker optimization algorithm is used to refine and optimize the PID parameters of the hydraulic unit regulation system under the conditions of rigid and elastic water hammer.The best PID parameters,adjustment time and control performance index under 5% frequency disturbance and 10% load disturbance are obtained.After comparing with the particle swarm optimization method,it is verified that the seeker optimization algorithm is feasible and effective to optimize the PID parameters of the hydraulic turbine governing system.The simulation results show that the PID parameters optimized by the seeker optimization algorithm enable the unit to have good regulation performance and stable performance under the intervention of frequency disturbance and load disturbance.In the future research,we should adjust the algorithm parameters and improve the algorithm to achieve better PID parameter optimization effect.