基于宽频信息的高压直流输电线路行波故障测距方法  

A Novel Fault Location Method for HVDC Transmission Line Based on the Broadband Travelling Wave Information

作　　者：徐敏[1] 蔡泽祥[1] 刘永浩[1] 张怿宁[2] 

机构地区：[1]华南理工大学电力学院,广州510640 [2]中国南方电网超高压输电公司检修试验中心,广州510663

出　　处：《电工技术学报》2013年第1期259-265,共7页Transactions of China Electrotechnical Society

摘　　要：针对目前直流行波故障测距精确度较低、对运行工况和故障条件适应性差的问题,提出了基于宽频故障信息的行波测距方法。首先,对直流故障行波的变波速特性及其与宽频信息之间的内在联系进行了深入分析,揭示了其对行波测距的影响机理。在此基础上,提出了基于宽频故障信息的行波测距变波速处理方案,有效解决了行波测距中的波速选取问题,提高了现有测距算法的测距精度。进一步,将该方案与模量传输时间差原理相结合,形成了无需检测故障行波第二波头的新型单端测距算法,具有较强的实用性和可靠性。在EMTDC环境下,以天广直流系统为背景进行了仿真分析,相关结果验证了所提测距方法的有效性和实用性。The existed high voltage direct current(HVDC) travelling wave fault location methods often have bad accuracy and can’t adapt to different working and fault conditions.To solve this problem,this paper presents a novel fault location method based on broadband travelling wave information.Firstly,a deep research is made on the travelling wave speed variation characteristic and its inherent relationship with the broadband information,pointing out how it impacts on fault locating results.Then,to deal with the variant speed properly,a complete wave speed treatment scheme is carried out based on the broadband information,significantly improving the accuracy of the excited fault location algorithms.Furthermore,applying the scheme into one terminal fault location,a novel one terminal algorithm is proposed,which does not need detect the second wavefront of the fault travelling wave and hence considerably reliable.Relevant simulation is performed in EMTDC taking Tian-Guang HVDC system for instance,and the results verify the correctness and feasibility of the method.

关 键 词：行波故障测距 宽频信息 变波速 直流输电 

分 类 号：TM77[电气工程—电力系统及自动化]