The Research On Methods Of Suppressing Oscillation Of Synchronous Generator In Ship Power System

At present,ships are developing towards the trend of integration,automation and intelligence.The ship is equipped with more and more electrical equipment,which makes the capacity and complexity of the ship's power system continue to increase,and the requirements for the stability of the ship's power system are also increasing.As an important component of the ship's power system,the synchronous generator's stability has an important impact on the stable operation of the entire ship's power system.This article takes the traditional marine synchronous generator excitation control system as the main research object,and studies the synchronous generator oscillation suppression method.The main contents are as follows:1.Based on the idea of modular modeling,the mathematical models of diesel prime mover and speed regulation system,synchronous generator and excitation system are established respectively.Based on the mathematical model,a stand-alone simulation model of the ship's power system is established in the simulation software.Then,an automatic quasi-synchronous parallel module is established according to the principle of two-machine synchronous parallel operation,and finally established a two-machine parallel simulation model of the ship's power system.Simple simulation experiments verify the validity of the established simulation model.2.According to the mathematical model of synchronous generator,the reason why traditional AVR excitation method based on PID control can not effectively suppress synchronous generator oscillation is explained from the perspective of synchronous torque and damping torque.According to the characteristics of the ship's power system,this paper proposes to apply the PSS2 B power system stabilizer in excitation system of ship synchronous generator to form the excitation control mode of AVR+PSS2B.Considering the shortcomings of traditional PSS parameter setting method,the artificial bee colony algorithm is used to optimize the parameters of PSS2 B type stabilizer.Under different working conditions,a simulation test was carried out on the ship's two-machine parallel power system,and the effects of AVR and AVR +PSS2B excitation control on the oscillation of various parameters of the synchronous generator were compared.3.Considering the shortcomings of the traditional AVR control and the nonlinear and time-varying characteristics of the ship power system,this paper applies the auto disturbance rejection control to the excitation system of the ship synchronous generator,and proposes anauto disturbance rejection control based excitation control method of the ship synchronous generator.Comparison and simulation of three methods of AVR,AVR+PSS2B and auto disturbance rejection control for marine dual-machine excitation system under different working conditions.The simulation results show that the excitation control system based on auto disturbance rejection control has better speed and anti-jamming capability,and can effectively suppress the oscillation of various parameters of the synchronous generator.