基于多电平滞环电流控制的牵引供电系统可控宽频带阻抗测量技术  

Controllable Broadband Impedance Measurement Technology of Traction Power Supply System Based on Multilevel Hysteresis Current Control

作　　者：陈司懿 胡海涛[1] 肖冬华 潘鹏宇 宋依桐 Chen Siyi;Hu Haitao;Xiao Donghua;Pan Pengyu;Song Yitong(School of Electrical Engineering Southwest Jiaotong University,Chengdu 611756 China;State Grid Sichuan Renshou County Electric Power Supply Branch,Meishan 620500 China;Electric Power Research Institute of State Grid Sichuan Electric Power Company,Chengdu 610072 China)

机构地区：[1]西南交通大学电气工程学院,成都611756 [2]国网四川省电力公司仁寿县供电分公司,眉山620500 [3]国网四川省电力公司电力科学研究院,成都610072

出　　处：《电工技术学报》2024年第9期2771-2783,共13页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金项目(52107125);四川省自然科学基金重大项目(2022NSFSC0001)资助。

摘　　要：精确获取牵引供电系统的宽频带阻抗特性,是分析车-网耦合系统的宽频带振荡问题的关键途径,对保障电气化铁路的安全稳定运行具有重要意义。目前的阻抗测量技术大多难以兼顾大功率与频带可控的测量要求,因此,该文提出一种基于多电平滞环电流控制的牵引供电系统可控宽频带阻抗测量技术,测量频带为10 Hz~5 kHz,可通过一次谐波扰动注入快速获取目标频带的系统阻抗,相比于传统的滞环电流控制方法,具有更低的开关频率,并且能有效避免死区效应,改善输出电流的波形,更适用于宽频信号的跟踪控制。最后,通过仿真和硬件在环实验验证了该测量技术的有效性。With the increasing mileage of electrified railways and the number of new electric locomotives,the power electronics characteristics of traction power supply system in China become more and more obvious,which can easily cause wide-band oscillation phenomenon.A lot of research shows that this phenomenon is caused by the input/output characteristics mismatch of electric locomotive and traction power supply system,and this mismatch can be regarded as the impedance characteristics mismatch of“vehicle-network”.Therefore,accurately obtaining the impedance characteristics of traction power supply system is of great significance for revealing the mechanism of wide-band oscillation in electrified railway and improving the reliability of railway power supply.However,the impedance mathematical modeling method relies on the derivation of mathematical formulas,which requires to know the detailed parameters inside the system,and the traction power supply system has complex structure,numerous components,dynamic topology changes,and the actual impedance of components may deviate from the production design parameters.The impedance characteristics obtained by impedance measurement are closer to reality.Therefore,this paper focuses on the research of controllable wide-band impedance measurement technique for traction power supply system,and the main research contents are as follows:A controllable wide-band impedance measurement device embedded with energy storage unit is proposed,which mainly includes:boost transformer,cascaded H-bridge,bidirectional DC-DC converter,super capacitor.Among them,bidirectional DC-DC converter and super capacitor form energy storage unit together,which provides stable DC voltage for cascaded H-bridge to generate wide-frequency harmonic current.Its power level can be flexibly expanded by increasing the number of modules.A multilevel hysteresis current control method is proposed,which uses the characteristic that the output voltage level of each port changes with the direction of output current,combin

关 键 词：牵引供电系统 阻抗测量技术 多电平滞环电流控制 谐波扰动 

分 类 号：TM922.3[电气工程—电力电子与电力传动]