高铁车网耦合系统电压低频振荡现象机理研究  

Mechanism on Voltage Low Frequency Oscillation of High-Speed Railway Traction Network and EMU Coupling System

作　　者：张桂南[1] 刘志刚[1] 向川[1] 姚书龙 

机构地区：[1]西南交通大学电气工程学院,四川省成都市610031

出　　处：《电网技术》2015年第7期1956-1962,共7页Power System Technology

基　　金：国家自然科学基金(51377136);高速铁路基础研究联合基金重点项目(U1434203;U1134205)~~

摘　　要：高速铁路车网耦合系统出现电压低频振荡现象,导致多个动车所的多台动车组牵引封锁,目前对其机理研究处于初期阶段。首先推导"牵引网–动车组"耦合系统的状态方程以及瞬态能量平衡方程,判定车网开环系统的稳定性,并采用小增益定理分析电压振荡的影响因素。接着,基于十导体链式电路搭建精确的高速铁路全并联AT(autotransformer)供电系统模型,并基于瞬态电流控制建立CRH3型动车组电气模型;在此基础上,实现车网系统的互联,并仿真再现电压振荡现象。随后,通过调节动车组控制器参数及负荷分布实现电压振荡的抑制,并分析调节控制器PI参数抑制电压振荡的局限性。最后采用FFT及Prony分析的方法实现了振荡电压低频成份的辨识。Traction blockades in many EMU in different place appear due to voltage Low Frequency Oscillation in High-speed Railway Traction Network and EMU Coupling System. The research of the mechanism of this phenomenon is currently still in its early stages. In this paper, firstly, the state equations and the transient energy balance equation of traction network and EMU coupled system are derived. Secondly, the open-loop stability of the traction network and EMU system is determined and the factors causing voltage oscillations are analyzed with the small gain theorem. Thirdly, the all-parallel connected autotransformer traction supply model is precisely built using a 10-conductor chain circuit and CRH3 EMU electrical model is established based on the transient current control. On this basis, the interconnected system of the traction network and EMU is implemented, and voltage oscillation phenomenon is reproduced. In addition, voltage oscillation is suppressed with adjusting EMU controller parameters and load distribution. By analyzing the PI controller parameter adjustment, it is found out that this suppression measure has its limitations. Finally, the frequency of the oscillating voltage is accurately extracted by using FFT method and Prony method.

关 键 词：瞬态能量平衡 小增益定理 全并联AT供电 CRH3型动车组 PRONY法 

分 类 号：TM721[电气工程—电力系统及自动化]