摘要
基于CRH3型动车组和牵引供电系统建立车—网电气耦合系统的简化模型,对牵引网压低频振荡的产生机理进行分析。结果表明:当网侧变流器控制策略为既有的瞬态电流控制策略时,因为系统中的1个极点基本位于虚轴附近,系统处于临界稳定状态,所以随着动车组开行数量的增加很容易引发牵引网压低频振荡。为抑制牵引网压低频振荡,提出多变量极点配置的网侧变流器控制策略,即通过对系统状态量的反馈控制,实现对系统极点的直接配置,从而在保证网侧变流器正常运行的同时,避免牵引网压低频振荡现象的发生。通过所建立的系统简化模型对多变量极点配置的网侧变流器控制策略进行仿真试验,验证了该网侧变流器控制策略抑制牵引网压低频振荡的有效性。
Based on CRH3 EMU and traction power supply system,a simplified model of vehicle-network electrical coupling system was established to analyze the mechanism of low frequency oscillation of traction network voltage.Results show that,when the control strategy for line side converter is the existing transient current control strategy,because a pole in the system is basically located near the imaginary axis,the system is in critical stable state.Therefore,with the increase in the number of EMUs,it is easy to cause low frequency oscillation of traction network voltage.To suppress the low frequency oscillation of traction network voltage,a multivariable pole placement control strategy for line side converter is proposed,which can achieve direct configuration of system poles via the feedback control of system state variable.The proposed control strategy ensures the normal operation of line side converter and avoids the low frequency oscillation of traction network voltage at the same time.Based on the established system simplified model,the effectiveness of the proposed control strategy is verified by means of simulation results.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2017年第6期100-107,共8页
China Railway Science
基金
国家自然科学基金资助项目(51677156
61733015)
国家重点研发计划项目(2016YFB1200502)
关键词
牵引供电
供电质量
网压低频振荡
网侧变流器
瞬态电流控制
多变量极点配置控制
高速铁路
Traction power supply
Power supply quality
Low frequency oscillation of network voltage
Line side converter
Transient current control
Multivariable pole placement control
High speed railway
