摘要
由于主电路参数失配以及逆变器-电机系统在特定工况下存在的负阻抗特性,城市轨道交通牵引系统容易发生直流侧母线电压振荡的现象。为解决此问题,文章建立了牵引系统的特征方程模型,分析了直流侧滤波参数对系统稳定性的影响。针对逆变器-电机驱动系统,提出了一种基于阻抗重构的振荡抑制方法。其通过补偿控制器输出的d轴和q轴参考电压信号,改善了逆变器-电机系统的负阻抗特性,从而使系统稳定运行。仿真与硬件在环实验结果表明,采用该抑制策略可有效抑制直流侧母线电压振荡,从而提高系统的稳定性。
Due to the mismatch of main circuit parameters and the negative impedance characteristics of inverter-motor system under specific operating conditions,urban rail transit traction system is prone to DC-link voltage oscillation.In order to solve this problem,this paper establishes a characteristic equation model of traction system,and analyzes the influence of DC-link filter parameters on system stability.For inverter-motor drive system,it proposes an oscillation suppression method based on impedance reconstruction.By compensating d axis and q axis reference voltage signal of controller,negative impedance characteristic of the inverter-motor system is improved so that the system is stable.Simulation and hardware-in-the-loop experiment results show that the suppression strategy can effectively suppress the oscillation and improve the stability of system.
作者
李婷婷
孙伟鑫
刘川
蒲俊楷
葛兴来
LI Tingting;SUN Weixin;LIU Chuan;PU Junkai;GE Xinglai(Chengdu Yunda Technology Co.,Ltd.,Chengdu,Sichuan 610097,China;Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle,Southwest Jiaotong University,Chengdu,Sichuan 610031,China)
出处
《控制与信息技术》
2021年第2期49-55,共7页
CONTROL AND INFORMATION TECHNOLOGY
基金
国家自然科学基金项目(51677156)。
关键词
阻抗重构
振荡抑制
牵引系统
电压失稳
impedance reconstruction
oscillation suppression
traction system
voltage instability
