摘要
针对国内电气化铁路频繁发生低频振荡现象并造成了机车牵引闭锁、供电系统保护跳闸等事故,该文围绕机车-供电网(车网)低频振荡的产生机理、影响因素进行理论分析。将电压源型变流器频域阻抗建模方法和低频振荡发生的具体工况相结合,建立了dq轴下车网阻抗模型。利用主导极点,分析了机车数量、电压环、电流环对车网系统低频振荡现象的影响规律,并结合电压环、电流环对机车阻抗特性的影响,总结了低频振荡发生时机车阻抗在低频段的变化规律,给出了调节控制参数抑制低频振荡的最优顺序。最后,利用时域仿真模型和小功率车网实验平台验证了参数对低频振荡的影响规律,有效说明了所得结论的正确性。
The low-frequency oscillation phenomenon has been frequently occurred in China electrified railways. It caused the traction locked of the train and the protection tripped of power supply system as well as other accidents. In this paper, the mechanism of this low-frequency oscillation in train-traction network system and its influential factors are fully investigated through both simulation and theoretical studies. The frequency-domain impedance modeling method for voltage-source converter(VSC) is presented with considering specific operations conditions of the low-frequency oscillation. In the dq frame, the impedance model of the train-traction network system is derived. Based on the dominant pole, the influence of different available factors have been detailed studied, such as the number of trains and the controller parameters of onboard rectifier on the low-frequency oscillation of train-traction network system. Combined with the influence of voltage loop and current loop on the trains' impedance, changes of impedance in low-frequency band is summed when low-frequency oscillation occurs. The optimal sequence of adjusting control parameters is given to suppress low-frequency oscillation. Finally, the influence of parameters on the low-frequency oscillation were verified by the simulation and experimental results, which effectively proved the correctness of the conclusion.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2017年第S1期72-80,共9页
Proceedings of the CSEE
基金
国家自然科学基金项目(51677154
51525702)~~
关键词
机车-供电网系统
低频振荡
阻抗分析
小信号模型
train-traction network system
low-frequency oscillation
impedance-based analysis
small-signal modal
