Research On Nonlinear PID Controller of Excitation System Based on PSO

Because linear PID controller in excitation control system was hard to obtain satisfactory control effect,we analyzed nonlinear relations of gain parameters and deviation for linear PID controller.According to regulation law between control quantity and error signal,we constructed a nonlinear PID controller.Particle swarm optimization(PSO)algorithm has feature of efficient parallel search in entire parameter space,improved PSO algorithm with cross factor was used to optimize gain parameters of nonlinear PID controller.Simulation results show that nonlinear PID controller can effectively improve accuracy of terminal voltage and has a good dynamic quality.