基于Duffing振子信号检测的户变关系识别方法  

Identification of Transformer-customer Relationship Based on Duffing Oscillator Signal Detection

作　　者：鲁泓壮 纪洪伟 焦之明 巩方波 陈杰 孟凡磊 LU Hongzhuang;JI Hongwei;JIAO Zhiming;GONG Fangbo;CHEN Jie;MENG Fanlei(Shandong Luruan Digital Technology Co.,Ltd.,Jinan 250101,Shandong,China)

机构地区：[1]山东鲁软数字科技有限公司,山东济南250101

出　　处：《电力大数据》2024年第7期45-53,共9页Power Systems and Big Data

摘　　要：针对传统特征电流识别法在接收识别精度上的局限,该文提出了一种基于Duffing振子的特征电流信号检测方法。该方法利用Duffing振子系统对初值的敏感性和良好的抗噪声特性,通过观察或监测系统相轨迹变化定性分析Duffing振子系统的临界状态。融合终端发起拓扑识别命令,出线监测单元产生和发送特征电流信号,并将提取的待测信号作为Duffing振子检测系统的输入。当待测信号中含有与Duffing振子系统同频率的分量时,通过定量计算系统临界阈值,实现对已知频率特征电流信号的检测。在仿真试验中,借由加入待测信号前后系统状态变量样本熵值的变化情况,精准判断Duffing振子系统的临界阈值的变化。仿真结果证明该方法可实现对指定频率特征电流信号的高效检测,显著提升了配电网户变关系识别的可靠性。In order to address the limitations of the traditional feature current identification method in terms of reception identification accuracy,a characteristic current signal detection method based on Duffing oscillator is proposed in the paper.The method utilizes the sensitivity of the Duffing oscillator system to the initial value and the good anti-noise characteristics,and qualitatively analyzes the critical state of the Duffing oscillator system by observing or monitoring the change of the system phase trajectory.The fusion terminal initiates a topology identification command,the outgoing monitoring unit generates and transmits a characteristic current signal,and the extracted signal to be measured is used as an input to the Duffing oscillator detection system.When the signal to be measured contains components with the same frequency as the Duffing oscillator system,the detection of the known frequency characteristic current signal is realized by quantitatively calculating the critical threshold of the system.In the simulation test,the change of the critical threshold of the Duffing oscillator system is accurately determined by the change of the sample entropy of the system state variable before and after the addition of the signal to be measured.The simulation results prove that the proposed method can realize the efficient detection of the specified frequency characteristic current signal,which significantly improves the reliability of the identification of transformer-customer relationship in distribution networks.

关 键 词：户变关系识别 特征电流法 DUFFING振子 相变阈值 样本熵 

分 类 号：TM73[电气工程—电力系统及自动化]