【作者】 杨其林；

【导师】 郑琼林；

【作者基本信息】 北京交通大学 ， 电气工程， 2012， 硕士

【摘要】 随着高速铁路的发展,高速列车普遍采用交-直-交的传动技术,其牵引传动系统的四象限脉冲整流器谐波频谱宽,高频谐波含量高,高速列车与牵引供电系统耦合振荡的问题逐步凸现出来,对高速铁路的安全运行带来了极大的危害。为分析牵引供电系统与高速列车牵引传动系统耦合振荡的机理和影响级联系统稳定性的关键因素,本文从牵引供电系统的谐波计算模型分析入手,对具有复杂结构的牵引供电网利用链式网络模型和节点电压矩阵计算方法研究其谐波的传播情况。研究牵引网分布参数的计算问题,编写了牵引网的谐波计算程序,并将牵引网谐波分析理论和计算程序应用到京沪高铁CRH380系列动车组出现的车网振荡事故的问题分析中,结合试验测试数据对事故原因做了较好的诠释。本文还对牵引网的单线简化模型进行了分析,通过公式推导计算了供电系统的等效阻抗并分析了谐波电流的放大情况。本文引入阻抗比判据对由牵引供电系统和四象限脉冲整流器组成的级联系统稳定性进行了分析,通过在简化电网参数情况下研究系统前级输出阻抗和后级输入阻抗的阻抗比关系,分析了影响此级联系统稳定的因素。针对牵引网的拓扑结构搭建了牵引供电网的仿真模型,与单相脉冲整流器的仿真模型联立为级联系统的仿真模型。通过对级联系统的仿真研究验证影响级联系统稳定性的因素。对单相脉冲整流器的控制策略进行了初步研究,分析了数字控制延时对无差拍控制的影响,进而提出了解决控制延时影响的预测电流控制方法。搭建了小功率的单相PWM整流器实验平台,通过实验对比了无差拍控制和预测电流控制电流环稳定性的差异,并对网侧参数和整流器控制环参数对系统稳定性的影响进行了实验验证。更多还原

【Abstract】 With the development of high-speed railway, high speed trains generally use AC-DC-AC drive technology. The harmonic spectrum of four-quadrant pulse rectifier in traction drive system is wide and there are plenty of high-frequency harmonic components. The coupled oscillation between high-speed train and traction power supply system gradually emerges and brings great harm to the safe operation of the high-speed rail.Aimed to analyze the coupled oscillation mechanism between traction network and traction drive system and the key factors affecting the stability of the cascade system, the thesis starts from the harmonic propagation analysis to the traction network. It works out the spread of the harmonics by the node voltage matrix calculation in the chain network model. It studies the distribution parameter calculation of traction network and writes the harmonic calculation program. The network harmonic analysis theory and computational procedures are applied to the analysis of resonant accident which happened on the Beijing-Shanghai line when CRH380series EMUs are tested. Analysis results combined with the test data give a good interpretation to the cause of the accident. To study the amplification of harmonic currents, the singlet simplified model of the traction network is analyzed and the equivalent impedance is calculated by the formula derivation.This thesis introduces the impedance ratio criterion to analyze the stability of the cascade system. The output-input impendence ratio is described in the case of simplified network parameters and the factors affecting the stability of the cascade system are analyzed. Both the traction network and the single-phase PWM rectifier are modeled in MATLAB and the model of the cascade system is tested to study its stability. The thesis preliminarily studies the control strategy of rectifiers and the deadbeat control with digitally controlled delay is analyzed. Predictive current control method is proposed to solve the control delay impact. A low-power single-phase PWM rectifier platform is built and experiments are implemented to analyze different control strategies and the stability of the system.更多还原