基于自抗扰控制的内燃机车低恒速系统

Low Constant Speed Control System of Diesel Locomotives Based on Active Disturbance Rejection Control

内燃机车结构复杂,而且在货场装载货物时负载不断变化,所以实现低恒速运行难度很大。本文首先建立了内燃机车电力传动系统的数学模型,并且对列车负载特性也进行了估算与分析;然后,依据数学模型设计了自抗扰控制器,通过调节主发电机励磁回路PWM占空比来实现对励磁电流大小调节,解决了由于系统参数时变导致的鲁棒性差以及调节时间过长和超调过大等问题。仿真分析以及实际应用表明本文提出的方法的有效性。

Structure of diesel locomotives are complex,also loads of the cargo are continuous changing in the freight yard,so it is difficult to run on a low constant speed.In this paper,a mathematical model of diesel electric drive system is established,also the load characteristics of the train is carried out to estimate and analysis;and then auto disturbance rejection controller based on mathematical model is designed.Excitation current can be modified through adjusting the PWM duty cycle of the main generator excitation circuit,so the problems such as poor robustness as well as regulation time too long and the overshoot too large due to the time-varying system parameter can be resolved.Simulation analysis and practical application show that the effectiveness of the method proposed in this paper is valid.