基于Teager能量算子瞬时能量的贯通式同相自耦变压器牵引供电系统牵引网纵联保护方案

提出一种基于Teager能量算子瞬时能量的贯通式同相AT牵引供电系统牵引网纵联保护方案。牵引变电所出口并联电容与一段接触线构成牵引网边界,通过分析发现该边界对高频信号有很强的衰减所用。利用FEEMD分解提取故障电流高频分量,然后利用Teager能量算子计算故障电流高频分量的瞬时能量,并提取两端瞬时能量最大值。区外故障时,故障电流高频分量瞬时能量最大值较小；区内故障时,该值较大。根据该差异来构造保护动作判据,判别故障位置,决定保护是否动作。基于PSCAD大量仿真实验表明,该保护方案能够准确判别区内、外故障,并且有较好的耐过渡电阻能力。

Pilot protection scheme of traction network based on Teager energy operator transient energy for continuous co-phase AT power supply system

A traction network longitudinal protection scheme based on FEEMD and Teager energy operator transient energy for continuous co-phase AT power supply system is proposed. The traction substation outlet shunt capacitor and a section of contact line constitute the traction network boundary, which is found to have a strong attenuation used for high-frequency signals through analysis. Therefore, the FEEMD decomposition is used to extract the high-frequency component of the fault current, and then the Teager energy operator is used to calculate the instantaneous energy of the high-frequency component of the fault current and extract the maximum instantaneous energy at both ends. In the case of faults outside the zone, the maximum value of the instantaneous energy of the high-frequency component of the fault current is smaller; in the case of faults inside the zone, the value is larger. The difference is used to construct the protection action criterion to identify the fault location and decide whether the protection will operate. Large amount of simulation results based on PSCAD indicate that the protection scheme can accurately discriminate internal and external faults and has good resistance to transition resistance.