摘要
为有效提高贯通式同相自耦变压器牵引供电系统牵引网的供电可靠性。提出一种基于Teager能量算子瞬时能量的贯通式同相自耦变压器(auto transformer,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作用。利用快速集合经验模态分解(fast-ensemble mode decomposition,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(power systems computer aided design),大量仿真实验表明,所提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。
In order to effectively improve the reliability of the traction network of continuous co-phase AT traction power supply system.A longitudinal protection scheme for traction network of through in-phase auto transformer(AT)traction power supply system based on instantaneous energy of Teager energy operator was proposed.The traction substation outlet shunt capacitor and a section of contact line constitute the traction network boundary,which was found to have a strong attenuation used for high-frequency signals through analysis.The fast-ensemble mode decomposition(FEEMD)decomposition was used to extract the high-frequency component of the fault current,and then the Teager energy operator was 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 was used to construct the protection action criterion to identify the fault location and decide whether the protection operated.Large amount of simulation results based on power systems computer aided design(PSCAD)indicate that the protection scheme can accurately discriminate internal and external faults and has good resistance to transition resistance.
作者
王龙
蔡潇
高敬业
蔡旺
毕贵红
陈仕龙
WANG Long;CAI Xiao;GAO Jing-ye;CAI Wang;BI Gui-hong;CHEN Shi-long(School of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China;Yunnan Electric Power Research Institute, Yunnan Power Grid Co., Ltd. , Kunming 650217, China)
出处
《科学技术与工程》
北大核心
2021年第32期13728-13736,共9页
Science Technology and Engineering
基金
国家自然科学基金(51767012)。
