基于多重分形谱的高压直流输电线路区内外故障识别方法  

Recognition Method of HVDC Transmission Line Fault Based on Multifractal Spectrum

作　　者：束洪春[1] 田鑫萃[1] 董俊[2] 安娜[1] 

机构地区：[1]昆明理工大学电力工程学院,昆明650051 [2]哈尔滨工业大学电气工程与自动化学院,哈尔滨150001

出　　处：《电工技术学报》2013年第1期251-258,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(50977039;51267009);云南联合基金(U1202233);云南省科技攻关项目(2011BA004;2011FA032);高等学校博士学科点专项科研基金(20105314110001)资助项目

摘　　要：对高压直流输电线路区内、区外故障进行仿真计算和分析发现:由直流输电线路平波电抗器和直流滤波器构成的物理实体边界对高频分量具有很强衰减作用,使得区外接地故障的直流输电线路两端量测的故障线模电压短窗时域波形极为平滑,即高频含量低,而区内接地故障的线路两端量测的故障线模电压短窗时域波形的高频含量高。利用短时窗内线路单侧故障电压计算每次分割形成的多重分形集上各个子集的质量分布概率分布的不均匀程度,区外故障时小于1,区内故障时远大于1。据此,提出了以多重分形谱中质量分布概率分布的不均匀程度作为区内外故障甄别算法。大量的PSCAD数字试验表明,该算法可靠有效,耐受高阻能力强。Simulating and analyzing the internal and external fault voltage of HVDC transmission line found that the existing physical entity boundary consisted by smoothing reactor and DC filters makes high frequency component attenuated strongly.It makes the aerial mode voltage of two terminals of the line smooth in short time window when external fault occurs,while for internal fault,the transient voltage contains more high frequency components.The single-ended fault voltage is used for calculating the quality distribution probability nonuniform extent of the formulated multifractal.The nonuniform extent is less than one when external fault occurs,while for internal fault,the nonuniform extent is greater than one.Thus,the internal and external faults identification algorithm based on quality distribution probability nonuniform extent of the multifractal is proposed.Massive PSCAD simulations show the proposed method effective and reliable.It shows excellent performance of transition resistance tolerance.

关 键 词：高压直流输电 多重分形谱 高阻故障 质量分布概率 标度指数 

分 类 号：TM711[电气工程—电力系统及自动化]