摘要
随着我国电气化高速铁路的快速发展,电气化铁路网运行的动车组数量大幅增加。高密度运行的动车组可能会引发车网耦合系统的低频振荡(low-frequency oscillations,LFOs),严重影响轨道交通运输的正常进行。该文针对具有复杂电力电子结构特性的单相车网耦合系统,尝试将谐波状态空间方法(harmonic state-space,HSS)应用于车网耦合系统的小信号阻抗建模。首先推导了车网耦合系统的基于谐波状态空间HSS的小信号阻抗模型,分别通过Matlab/Simulink仿真平台与StarSim半实物平台验证了此模型的精确性;基于所搭建的模型,采用阻抗稳定性分析方法,成功地分析了多车并网引起车网耦合系统低频振荡的机理;最后分别定量研究了电力机车接入的数目和网侧感抗值对车网耦合系统稳定性的影响规律。理论分析和半实物结果表明,该建模方法可以实现简单且精确的车网耦合系统稳定性分析。
As the electrified high-speed railway develops rapidly,the number of the electric multiple units(EMUs)has increased significantly.However,the high-density EMUs may trigger low-frequency oscillations(LFOs)in the vehicle-grid coupling system.Due to the complex power electronic structure characteristics of the single-phase vehicle-grid coupling system,this paper attempts to apply the Harmonic State Space(HSS)to the modeling of the small-signal impedance of the vehicle-grid coupling system.Firstly,a small-signal impedance model of the vehicle-grid coupling system based on HSS is deduced and then verified via both the Matlab/Simulink platform and the StarSim semi-physical platform.Based on the model deduced and the impedance stability analysis,the mechanism of LFOs caused by multiple EMUs is analyzed and the effect rule of the number of EMUs and grid inductance on the stability of the vehicle-grid coupling system is quantitatively studied.Theoretical analysis and semi-physical verification show that the method proposed in this paper can achieve simple and accurate stability analysis of the vehicle-grid coupling system.
作者
李志远
吴思奇
孟祥宇
刘志刚
张晗
LI Zhiyuan;WU Siqi;MENG Xiangyu;LIU Zhigang;ZHANG Han(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,Sichuan Province,China)
出处
《电网技术》
EI
CSCD
北大核心
2021年第7期2709-2718,共10页
Power System Technology
基金
国家自然科学基金高铁联合基金重点项目(U1434203)
中国中铁二院工程集团有限责任公司科研项目(KYY2020033(20-21))。
