基于多频点插值和三维曲面建模的MOA阻性电流测量方法  

New Measurement Method for MOA Resistive Current Based on Multi-frequency Points Interpolation and Three-dimensional Surface Modeling

作　　者：李海峰 华永东 姜燕 王广真 刘俊勇[1] LI Haifeng;HUA Yongdong;JIANG Yan;WANG Guangzhen;LIU Junyong(School of Electrical Engineering&Information,Sichuan University,Chengdu 610065,China;State Grid Sichan Power Supply Company,Chengdu 610041,China;State Grid Information Communication Industry Group Limited Company,Beijing 102211,China;China Electric Power Research Institute,Beijing 100192,China)

机构地区：[1]四川大学电气信息学院,成都610065 [2]国网四川省电力公司,成都610041 [3]国网信通产业集团有限公司,北京102211 [4]中国电力科学院有限公司,北京100192

出　　处：《高电压技术》2019年第11期3512-3520,共9页High Voltage Engineering

摘　　要：金属氧化物避雷器(metallic oxide arrester,MOA)的阻性电流是衡量避雷器运行状态的关键参数,传统的阻性电流测量方法易受到瞬时高频干扰信号、实际环境因素等影响,致使测量结果产生较大偏差,进而影响MOA的在线监测结果。为此,提出了一种基于多频点插值和三维曲面建模的MOA阻性电流测量方法。先对避雷器的电压和全泄漏电流频谱进行相位因子变换,通过多频点插值算法得到MOA的全电流参数和电流、电压相位差参数;再将计算出的全电流和相位差参数与温度、湿度参数进行三维曲面拟合建模,并求解模型得到消除环境因素影响的MOA阻性电流。研究结果表明:多组仿真试验和实测数据均验证了所提方法的准确性和有效性,其中220kV、110kV避雷器的阻性电流波动值分别降低了74%和67%。该方法消除了高频噪声信号、谐波和间谐波等干扰影响,解决了避雷器监测参数一直遭受环境温度、湿度因素干扰的难题,能满足实际工程测量要求,可实现MOA阻性电流的准确监测及异常甄别。The resistive current of metallic oxide arrester(MOA)is a key parameter to measure the MOA operating status,and traditional measurement methods for resistive current are susceptible to transient high-frequency interference signal and actual environmental conditions,leading to a greater deviation measuring result.Therefore,we proposed a novel method for measuring MOA resistive current based on multi-frequency points interpolation and three-dimensional surface modeling.The voltage and the total leakage current spectral of the arrester were transformed by phase factor firstly,then the total leakage current and the current-voltage phase difference parameters were obtained by multi-frequency interpolation algorithm,and the interference effects caused by high frequency noise signals,harmonics,and interharmonics were eliminated.Furthermore,the three-dimensional surface fitting modeling of the calculated total leakage current,phase difference parameters and the temperature and humidity parameters was proposed,and the model was solved to obtain the MOA resistive current.The research results show that,both multiple simulation and practical data verify the accuracy and validity of the proposed method,and the fluctuated values of resistive current in MOA of 220 kV and 110 kV have reduced by 74%and 67%,respectively.The method eliminates the impact of environmental conditions,thus can be adopted to solve the difficult problem of MOA monitoring parameters suffered from environmental temperature and humidity factors interference.The method can meet the requirements of practical engineering measurement,and achieves accurate monitoring and abnormal screening of MOA resistive current.

关 键 词：金属氧化物避雷器 阻性电流 频谱分析 环境因素 曲面插值 在线监测 

分 类 号：TM862[电气工程—高电压与绝缘技术]