考虑谐波耦合的车网系统谐波域SISO阻抗建模  

SISO Equivalent Impedance Modeling of Vehicle Network System in Harmonic Domain Considering Harmonic Coupling

作　　者：刘洋铭 吴思奇 孟祥宇 刘志刚[1] LIU Yangming;WU Siqi;MENG Xiangyu;LIU Zhigang(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,Sichuan Province,China)

机构地区：[1]西南交通大学电气工程学院,四川省成都市611756

出　　处：《电网技术》2022年第4期1594-1604,共11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);四川省科技计划科技创新人才(2021JDRC0008)。

摘　　要：我国电力机车和牵引网具有复杂的电力电子结构特性,由此而产生的车侧变换器和单相交流电网之间的谐波相互作用,容易导致整个车网系统出现低频振荡现象,严重影响车网系统的稳定。基于车网系统的时变特性,考虑车网之间的谐波耦合过程,提出了基于线性时变周期(linear time-periodic,LTP)框架的谐波状态空间(harmonic state space,HSS)小信号建模方法,以对车网系统进行研究。首先推导了车侧变换器的多输入多输出(multiple-input multiple-output,MIMO)谐波域阻抗模型,并揭示了由于车侧控制器中Park变换导致系统出现偶数倍基频频率耦合的过程。将建立的MIMO阻抗模型转换为保留了所有频率耦合信息的单输入单输出(single-input single-output,SISO)谐波域阻抗模型,从而进一步简化了阻抗测量和基于阻抗的稳定性分析过程。最后,通过Matlab/Simulink仿真平台与StarSim半实物平台验证了模型的精确性并基于所搭建的模型准确地评估了车网耦合系统的低频稳定性。In China,the electric locomotives and traction networks have complex power electronic structural characteristics,This situation may cause the harmonic interaction between the vehicle-side converter and the single-phase AC grid,leading to the low-frequency oscillations in the entire vehicle network system,which seriously affects the stability of the network system.Due to the time-varying characteristics of the vehicle network system,taking into account the harmonic coupling process between the vehicle networks,this paper proposes a Harmonic State Space(HSS) small signal modeling method based on the linear time-varying period(LTP) framework in order to have a close study of the vehicle network system.The Multiple-Input Multiple-Output(MIMO) harmonic domain impedance model of the vehicle-side converter is derived firstly.It is revealed that the system has an even multiple of the fundamental frequency coupling process due to the Park transformation in the vehicle-side controller.After that,the established MIMO impedance model is converted into a single-input single-output harmonic domain impedance model that retains all the frequency coupling information,which further simplifies the impedance measurement and impedance-based stability analysis process.Finally,the accuracy of the model is verified through the Matlab/Simulink simulation platform and the StarSim semiphysical platform.Based on the built model,the low-frequency stability of the vehicle-network coupling system is accurately evaluated.

关 键 词：频率耦合 线性时变周期 谐波域阻抗模型 单输入单输出 低频稳定性 

分 类 号：TM721[电气工程—电力系统及自动化]