关键词: 光纤传感系统, 偏振衰弱, 改进Adamax算法, 高压电缆, 定位精度

Abstract: In order to improve the reliability and positioning accuracy of optical fiber detection of partial discharge signals in long distance high-voltage cables, the problems of polarization attenuation and phase drift in distributed optical fiber sensing systems and overcome, the model of optical fiber sensing detection system connected with polarization controller is built. An improved polarization control algorithm(Adamax)is proposed based on the analysis of the ultrasonic characteristics of cable partial discharge. By adjusting the driving voltage of the polarization controller to reduce polarization attenuation, the attenuation rate, noise amplitude, control accuracy and other parameters of the algorithm are simulated based on MATLAB. The results show that the average iterative steps of the improved algorithm are reduced by about 35% compared with Adam algorithm, and the control convergence accuracy can reach 10^-4. - DOI:10.3969/j.issn.1000-1565.2024.05.009基于偏振控制算法的电缆局部放电光纤传感定位刘志恒^1,2,杨森¹,陈前¹,郝雷¹,刘志宾¹,孟晓凯³(1.河北大学 电子信息工程学院,河北 保定 071002;2.天津大学 光电信息技术教育部重点实验室,天津 300072;3.国网山西省电力公司电力科学研究院,山西 太原 032100)摘 要:为提高长距离高压电缆局部放电信号光纤检测的可靠性和定位精度,解决分布式光纤传感系统中的偏振衰弱和相位漂移问题,搭建接入偏振控制器的光纤传感检测系统模型对电缆局部放电超声特性进行分析,提出了一种基于改进偏振控制的自适应矩估计最大值优化算法(adaptive moment estimation max, Adamax).通过调整偏振控制器的驱动电压以减小偏振衰弱,基于MATLAB对算法的衰减率、噪声幅度、控制精度等参数进行仿真计算,结果表明改进算法比Adam算法平均迭代步数降低了约35%,控制收敛精度可达到10^-4级.在15 km高压电缆系统进行了光纤传感局部放电定位检测实验,结果表明改进的偏振控制算法定位精度为±12 m.验证了分布式光纤传感系统中偏振控制器和改进算法的可靠性和定位精度,为基于大数据的高压输电设备绝缘状态监测提供技术支撑.关键词:光纤传感系统;偏振衰弱;改进Adamax算法;高压电缆;定位精度中图分类号:TM855 文献标志码:A 文章编号:1000-1565(2024)05-0521-14Optical fiber sensing and location of cable partial discharge based on polarization control algorithmLIU Zhiheng^1,2,YANG Sen¹,CHEN Qian¹,HAO Lei¹,LIU Zhibin¹,MENG Xiaokai³(1.College of Electronic Information Engineering, Hebei University, Baoding 071002, China; 2. Key Laboratory of Opto-electronic Information Technology, Ministry of Education, Tianjin University, Tianjin 300072, China; 3. State Grid Shanxi Electric Power Research Institute, Taiyuan 032100, China)Abstract: In order to improve the reliability and positioning accuracy of optical fiber detection of partial discharge signals in long distance high-voltage cables, the problems of polarization attenuation and phase drift in distributed optical fiber sensing systems and overcome, the model of optical fiber sensing detection system connected with polarization controller is built. An improved polarization control algorithm(Adamax)is proposed based on the analysis of the ultrasonic characteristics of cable partial discharge. By adjusting the driving voltage of the polarization controller to reduce polarization attenuation, the attenuation rate, noise amplitude, control accuracy and other parameters of the algorithm are simulated based on MATLAB. The results show that the average iterative steps of the improved algorithm are reduced by about 35% compared with Adam algorithm, and the control convergence accuracy can reach 10^-4. - 收稿日期:2023-03-08;修回日期:2023-10-23 基金项目:中央引导地方科技发展资金项目(236Z4411G);河北省高层次人才资助项目(B2020005004);教育部产学研协同育人项目(220606517133928;22090423222205) 第一作者:刘志恒(1984—),男,河北大学副教授,博士,主要从事智能高压电器绝缘检测、先进光纤检测技术等研究.E-mail: liuzhiheng17@126.com 通信作者:郝雷(1978—),男,河北大学副教授,博士,主要从事智能高压电器绝缘检测、智能制造与工业大数据技术研究.E-mail: 13066687@qq.com 第5期刘志恒等:基于偏振控制算法的电缆局部放电光纤传感定位河北大学学报(自然科学版) 第44卷The experiment of optical fiber sensing partial discharge location and detection is carried out in a 15 km high-voltage cable system. The results show that the location accuracy of the improved polarization control algorithm is within ± 12 m. The reliability and positioning accuracy of polarization controller and improved algorithm in distributed optical fiber sensing system are verified, which provides technical support for insulation condition monitoring of high-voltage transmission equipment based on big data.

Key words: optical fiber sensing system, polarization fading, improved Adamax algorithm, high voltage cable, positioning accuracy