地铁牵引变流器直流侧振荡抑制策略研究  

Research on DC-Link Oscillation Suppression Strategy in Metro Traction Converter

作　　者：孙大南[1] 刘志刚[1] 林文立[2] 刁利军[1] 

机构地区：[1]北京交通大学电气工程学院,北京100044 [2]浙江大学电气工程学院,浙江杭州310027

出　　处：《铁道学报》2011年第8期52-57,共6页Journal of the China Railway Society

基　　金："十一五"国家科技支撑计划重点项目(2007BAA12B07)

摘　　要：负阻抗会引起地铁车辆牵引变流器直流侧电压、电流振荡,降低牵引传动系统稳定性。本文建立地铁牵引变流器关注直流侧的系统小信号模型,详细分析直流侧振荡的产生机理。提取直流侧电压谐振分量,提出基于直流侧电压振荡比修正给定牵引、制动转矩的直流侧振荡抑制策略,利用相平面法和根轨迹法讨论振荡抑制策略对系统稳定性的改善以及参数选择对控制性能的影响。模型仿真和地铁现场试验结果均表明,该振荡抑制策略能有效消除直流侧振荡现象,提高系统稳定性。Negative impedances lead to DC-link voltage and current oscillation in metro traction converters and so to reduction of stability of traction drive systems.In this paper the small signal model following the DC-link of the traction converter system is established and the mechanism of DC-link voltage and current oscillation is analyzed in detail.The DC-link resonance voltage is extracted and the DC-link oscillation suppression strategy is proposed on the basis of DC-link voltage oscillation ratio correction for the given traction/brake torque.The phase plane and root locus methods are used to discuss the improvement of the oscillation suppression strategy on system stability and the impact of parameters on control performance.Simulation and field experiment results show that the oscillation suppression strategy effectively eliminates DC-link oscillation and improves system stability.

关 键 词：牵引变流器 负阻抗 振荡抑制 稳定性 

分 类 号：U231.8[交通运输工程—道路与铁道工程]