静态无功补偿器电磁辐射干扰的测量与特征提取方法  

Measurement and Feature Extraction of the Radiated Emissions Generated by a Static Var Compensator

作　　者：张黎[1,2] 李庆民[1] 王伟[1] Siew W.H. 

机构地区：[1]山东大学电气工程学院,济南250061 [2]山东大学物理学院,济南250100 [3]英国Strathclyde大学电子与电机工程系

出　　处：《电工技术学报》2010年第12期8-15,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(50577039);教育部新世纪优秀人才支持计划(NCET-08-0335);山东省自然科学杰出青年基金(JQ200916)资助项目

摘　　要：安装于变电站的静态无功补偿器用以减小负荷变化带来的影响,提高输电系统的柔性。然而,由于晶闸管的频繁开断而产生的大量宽带电磁干扰,对电网以及附近电子设备造成电磁环境污染。建立了基于光纤和路、场传感器的先进测试系统,对安装有静态无功补偿器的变电站电磁环境进行现场测量。基于校正后的电磁辐射干扰测量数据,分析了一个工频周期内静态无功补偿器的开关冲击特征,给出了辐射干扰的幅值以及频率范围。进一步引入时频分析技术,建立了基于时频分析的电磁干扰特征提取方法,可获得更丰富的电磁干扰细节特征,对分析静态无功补偿器的电磁干扰机制和评估电磁环境提供了基础依据。Within nowadays substations,static var compensator（SVC） devices are being realized to achieve high flexibility and wide tolerance to load variation.However,due to frequent switching of the thyristors,large amount of broadband electromagnetic emissions are being generated,which results in electromagnetic contamination to both the power grids and the victim electronic devices positioned nearby.Based on optical fiber,circuit and field transducers,an advanced acquisition system is established to implement on-site measurements of the electromagnetic interference（EMI）.Based on the corrected measurement data,the switching bursts of the radiated EMI data within a power cycle are analyzed to give the frequency and amplitude range of the radiated interferences.Further,with utilization of time-frequency analysis techniques,a feature extraction methodology for electromagnetic emissions based on time-frequency analysis is established,and more detailed and useful information of the SVC-based electromagnetic environment can be obtained through 2-D and 3-D display,which presents fundamental reference for characterizing the SVC-based interfering mechanisms and effectively evaluating the electromagnetic environment.

关 键 词：静态无功补偿器 电磁辐射干扰 数字化校正 特征提取 时频分析 

分 类 号：TM937[电气工程—电力电子与电力传动]