根据牵引网线路边界对高频暂态量的衰减作用，提出一种基于快速总体平均经验模式分解（FEEMD）和Teager能量算子（TEO）的贯通式自耦变压器(AT)同相牵引供电系统牵引网单端功率方向保护方法。求采集到的电压电流信号故障发生时的瞬时功率，并对暂态功率进行Teager变换求得TEO波形突变点的极性来作为方向判据，判别是正向故障或反向故障；若为正向故障（区内或对侧区外），再对故障暂态电流信号进行FEEMD分解，提取故障信号的固有模态函数1（IMF1）分量，再对IMF1分量进行TEO变换，求出高频暂态电流信号的TEO谱瞬时值，然后求取其绝对值并求和，进而判断故障位于区内还是对侧区外。最终通过PSCAD/EMTDC仿真软件搭建贯通式AT同相牵引供电系统模型，在不同故障条件下进行大量仿真提取数据，仿真结果证明本方案能够有效区分区内外故障，保护牵引网线路全长。

According to the attenuation effect of the traction network line boundary on high-frequency transient, a single-ended power direction protection method for the traction network of the through-type auto transformer (AT) in-phase traction power supply system based on fast ensemble empirical mode decomposition (FEEMD) and Teager energy operator (TEO) is proposed. Obtain the instantaneous power of the collected voltage and current signals when the fault occurs, and perform Teager transformation on the transient power to obtain the polarity of the TEO waveform mutation point as the direction criterion to determine whether it is a forward fault or a reverse fault. If it is a forward fault (inside or outside the opposite side), the fault transient current signal is decomposed by FEEMD, the intrinsic mode function 1 (IMF1) component of the fault signal is extracted, and then TEO is performed on the IMF1 component to obtain the instantaneous value of the TEO spectrum of the high-frequency transient current signal. The absolute pair value is obtained and summed, so as to judge whether the fault is inside or outside the opposite. Finally, the through-type AT in-phase traction power supply system model is built through PSCAD/EMTDC simulation software, and a large number of simulation data are extracted under different fault conditions. The simulation results show that this scheme can effectively partition internal and external faults and protect the full length of the traction network line.

TM773

国家自然科学基金项目(51767012)