基于滑模结构无源控制的车网耦合系统低频振荡抑制方法  

An Approach Based on SMS to Suppress Low-Frequency Oscillation in the EMUs and Traction Network Coupling System Using PBC

作　　者：王迎晨 杨少兵[1] 宋可荐[1] 吴命利[1] Wang Yingchen;Yang Shaobing;Song Kejian;Wu Mingli(School of Electrical Engineering Beijing Jiaotong University Beijing,100044 China)

机构地区：[1]北京交通大学电气工程学院

出　　处：《电工技术学报》2020年第3期553-563,共11页Transactions of China Electrotechnical Society

基　　金：中央高校基本科研业务费专项资金（2018JBZ101）;国家重点研发计划先进轨道交通重点专项资金（2017YFB1200802）;博士后创新人才支持计划（BX201700026）资助项目

摘　　要：近年来国内多地出现高速铁路牵引网低频振荡,情况严重时导致动车组发生牵引封锁。该文以CRH5型动车组为算例,提出一种基于滑模结构电流无源控制的动车组PWM整流器双闭环控制策略抑制低频振荡。首先,建立车网耦合系统回比矩阵模型,利用G-sum范数判据分析了低频振荡的产生机理,得到车网耦合系统发生低频振荡的临界条件。然后,根据低频振荡发生时的工况,推导动车组整流器dq轴状态空间模型,设计基于外环电压滑模结构无源控制的内环电流控制器。与几种传统算法的稳定性分析及仿真结果对比表明,提出的算法具有更好的稳态和动态特性,有效地抑制了牵引网低频振荡现象。In recent years, there have been a number of low-frequency oscillations(LFO) of electric multiple units and traction network coupling system(EMUs-TNCS) in high-speed railways, leading to traction blockade of the EMUs. Taking the CRH5 EMUs as an example, this paper presents a double closed-loop control strategy for EMUs PWM rectifiers based on current passivity-based control of sliding mode structure(CPBC-SMS) to suppress the LFO. Firstly, a return-ratio matrix model of the EMUs-TNCS is established, and the generation mechanism of the LFO is analyzed by using the G-sum norm criterion, obtaining the critical condition of the LFO. Then, according to operating conditions of the LFO, the state space model of each EMUs rectifier is derived in dq-frame. Subsequently, the internal loop current controller based on CPBC-SMS is designed. Stability analysis and simulation results validate that the proposed control provides effective capability of the LFO suppression with better steady-state and dynamic performance compared to several conventional methods.

关 键 词：低频振荡 车网耦合系统 稳定性分析 PWM整流器 滑模结构 无源控制 

分 类 号：TM712[电气工程—电力系统及自动化]