基于多变量控制的高铁低频振荡过电压阻尼方法

摘要

针对高速铁路网电压低频振荡导致动车组牵引封锁的现象,首先建立动车组线侧脉冲整流器状态空间模型;其次,对四象限整流器多变量控制策略进行详细的数学推导及参数设计,并在其闭环状态方程推导的基础上,研究了多台动车组采用多变量控制的车网系统稳定性,结果表明系统能够处于渐进稳定状态;然后在MATLAB的Simulink模块中搭建双重化变流器及其控制模型,对比分析瞬态直接电流控制和多变量控制的控制效果,得出多变量控制具有更好的动、静态特性;最后将2种控制方法下的整流器仿真模型接入牵引网系统链式仿真模型中,进一步验证多变量控制对车网低频振荡过电压良好的阻尼特性.%The voltage low-frequency oscillation of high-speed railway traction network may block the traction of EMUs(Electrical Multiple Units),aiming at which,a state space model of line-side pulse rectifier is established,the multivariable control strategy of four-quadrant converter is mathematically deduced and its parameters are designed in detail.The stability of traction network system is studied based on the derived closed-loop state equations for the EMUs with multivariable control,which shows the system is in the asymptotic stability state.A doubly redundant rectifier and its control model are simulated in MATLAB/Simulink and the control effect is compared between the instantaneous direct current control and the multivariable control,which shows the multivariable control has better dynamic and static performance.The simulated rectifier model is applied to the simulation model chain of traction network system for two control strategies,which further verifies the better performance of multivariable control in the overvoltage damping during the low-frequency oscillation of traction network.