基于二阶泰勒系数的励磁涌流识别方法  

Magnetizing Inrush Current Identification Method Based on Second-Order Taylor Derivative

作　　者：宋九渊 符玲[1] 熊思宇[1] 邓瑜佳 王俊雄[1] 刘新闯 李小鹏 SONG Jiuyuan;FU Ling;XIONG Siyu;DENG Yujia;WANG Junxiong;LIU Xinchuang;LI Xiaopeng(College of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,SichuanProvince,China;College of Engineering,QuFu Normal University,QuFu 276826,Shangdong Province,China;State Grid Sichuan Electric Power Research Institute,Chengdu 610072,Sichuan Province,China)

机构地区：[1]西南交通大学电气工程学院,四川省成都市610031 [2]曲阜师范大学工学院,山东省曲阜市276826 [3]国网四川省电力研究院,四川省成都市610072

出　　处：《中国电机工程学报》2020年第3期1020-1029,共10页Proceedings of the CSEE

基　　金：国家自然科学基金(面上基金项目)(51777173);四川省科技厅计划项目(2018GZ0014)~~

摘　　要：电网发展使得变压器故障信号成分复杂的同时又对变压器保护提出了更高要求,而现有励磁涌流识别方案难以满足在闭锁期间对变压器故障的准确、快速判别。因此,该文基于二阶泰勒系数提出一种既具有较强抗干扰性能又具有较快判别速度的励磁涌流识别方法。首先,利用泰勒级数展开建立了包含基频分量和二次谐波分量的励磁涌流动态信号模型;其次,研究了励磁涌流和故障工况下二阶泰勒系数的作用机理和变化规律;最终,基于频率测量算法估计二阶泰勒系数进而建立了励磁涌流的识别方案。仿真测试了变压器各种励磁涌流和故障工况,结果验证了所提方案能够在13ms内可靠识别励磁涌流,保护闭锁期间快速识别故障,并具有抗-35dB噪声的能力。The development of the power grid makes the transformer fault signal component extremely complex and puts forward higher requirements for transformer protection.However,the existing magnetizing inrush current identification scheme is difficult to meet the accurate and rapid discrimination of transformer fault during the lockout period.Therefore,based on the second-order Taylor derivative,this paper proposes a method of magnetizing inrush current identification that has both strong anti-interference performance and fast discriminating speed.Firstly,the dynamic signal model of the magnetizing inrush current including the fundamental component and the second harmonic component is established by using Taylor series expansion.Secondly,the mechanism and variation law of the second-order Taylor derivative under the excitation inrush current and fault condition are studied.Finally,Based on the frequency measurement algorithm,the second-order Taylor derivative is estimated to establish the identification scheme of the magnetizing inrush current.The simulation tests the various magnetizing inrush currents and fault conditions of the transformer.The results verify that the proposed scheme can reliably identify the inrush current in 13 ms,identify the fault quickly during protection and blocking,open protection within 20 ms,and have anti -35 dB noise.ability.

关 键 词：变压器 励磁涌流 泰勒系数 频域测量算法 

分 类 号：TM774[电气工程—电力系统及自动化]