摘要
地铁牵引供电系统与周边电网回路存在磁感应现象,由此产生的感应电流可能导致变压器发生直流偏磁。为定量分析地铁牵引供电系统在电网回路中产生的磁感应电压大小,文章首先基于磁感应电压产生机理,计算对比地铁牵引供电系统电网回路中磁感应电压的计算值和仿真值,继而利用傅里叶分析磁感应电压的特点,得出以下结论:磁感应电压为极低频交流电压;当列车未驶入或已驶离与电网回路并行区间时,二者之间的误差以感生电动势为主,当列车行驶进入与电网回路形成并行区间时,误差为感生电势与动生电势的累加。
The electromagnetic induction phenomenon is present between the metro traction power system and the surrounding power grid circuit.The generated induced current may cause DC bias of the transformers.In order to quantitative determination the electromagnetic induction voltage generated by the metro traction power system in the power grid circuit,the paper first calculates and compares the calculated and the simulated values of the electromagnetic induction voltage in the power grid circuit of the metro traction power system based on the electromagnetic induction voltage mechanism,and then analyzes the characteristics of the electromagnetic induction voltage by the Fast-Fourier transform,and draws the following conclusions:the electromagnetic induction voltage is an extremely low-frequency AC voltage.When the train does not enter or has left the parallel section with the grid circuit,the error between the two is mainly the induced electromotive force;when the train enters the parallel section with the grid circuit,the error is the accumulation of the induced electromotive force and the motional electromotive force.
出处
《现代城市轨道交通》
2023年第1期43-48,共6页
Modern Urban Transit
关键词
地铁
牵引供电系统
电网回路
磁感应电压
感生电势
动生电势
metro
traction power system
grid circuit
electromagnetic induction voltage
induced electromotive force
motional electromotive force
