基于暂态波形特征的输电线路雷击干扰与故障识别方法  

Identification of lightning strike disturbance and faults for transmission line based on transient waveform characteristics

作　　者：吕哲 王增平 LüZhe;WANG Zengping(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206

出　　处：《电力系统保护与控制》2020年第6期18-26,共9页Power System Protection and Control

基　　金：国家重点研发计划项目资助(2016YFB0900604);国家自然科学基金重点项目资助(51637005)。

摘　　要：随着大量电力电子装置应用于电网,暂态量保护的优势逐渐凸显。针对其易受雷击干扰影响的问题,在非雷击故障、雷击干扰和雷击故障下,对各相暂态电流附加分量进行了分析。得出故障与雷击干扰的本质差异为:故障暂态波形的整体变化趋势中具有明显的工频正弦特征。据此,采用平均值滑动去噪的方法可基本消除雷电流等高频影响,获得暂态电流的主波形。提出采用50 Hz正弦函数对主波进行拟合,基于拟合决定系数的大小可识别各相线故障。经PSCAD/EMTDC电磁暂态仿真,验证所提识别方案能正确识别各种类型下的雷击干扰与故障,不受故障初始角及过渡电阻的影响,适用于不同类型输电线路。With the large number of power electronic devices applied to the power grid, the advantages of transient protection are more obvious. For the problem that it is susceptible to lightning strikes, the additional component of transient current in each phase are analyzed under short-circuit fault, lightning strike disturbance and lightning strike causing fault. The essential difference between fault and disturbance is whether the trend of the transient waveform has the characteristic of power frequency sine wave. Accordingly, the method of using the average value sliding denoising can eliminate the high frequency effects such as lightning current, and obtain the main waveform. It is proposed to fit the main wave with a 50 Hz sinusoidal function. Based on the determination coefficient criterion of fitting, the faults and lightning strike disturbance of each phase line can be distinguished. The PSCAD/EMTDC electromagnetic transient simulation results verify that the proposed identification scheme can correctly identify lightning strikes and faults under various scenarios. It is suitable for various transmission lines without being affected by the inception angle of the fault and the transition resistance.

关 键 词：输电线路 暂态量 雷击干扰 波形特征 正弦拟合 

分 类 号：TM863[电气工程—高电压与绝缘技术]