单双端行波特征综合考虑的辐射状电网组合测距技术  

Fault Location in Radial Power Grid After Analyzing Characteristics of Both Single-terminal and Double-terminal Traveling Waves

作　　者：梁睿[1] 孙式想[2] 靳征[3] 马草原[1] 

机构地区：[1]中国矿业大学信息与电气工程学院,徐州221116 [2]国网宿州供电公司,宿州234000 [3]山东电力集团公司东营供电公司,东营257000

出　　处：《高电压技术》2014年第5期1461-1467,共7页High Voltage Engineering

基　　金：中国博士后科学基金(2013M531427);中央高校基本科研业务费专项资金(2011QNA19)~~

摘　　要：为提高配电网行波测距的可行性及准确性,提出了一种适用于辐射状电网的组合测距技术。该技术综合考虑单端行波测距及双端行波测距的特点及适用性,首先利用双端行波测距易实现的特点判断故障大致距离,然后基于该故障距离及线路自身参数关系来准确识别故障点反射波和对端母线反射波达到测量端的时刻,从而精确测得故障距离。因此它克服了双端测距受GPS同步对时系统的误差对测距结果影响,以及单端行波测距无法准确辨识故障特征波前的困难。搭建了35 kV单端辐射状电网PSCAD仿真模型,针对不同的故障距离、接地电阻、故障类型分别进行数据分析,通过双端测距的结果准确验证了故障点反射波和对端母线反射波时刻,测距误差在100 m之内。研究结果表明,提出的方法通过单双端行波特征综合考虑的测距方法能实现2种方法的相互印证,提高了单端辐射状配电网行波测距精度。To improve fault location in power distribution networks in both accuracy and feasibility, we propose a combined method for radial power grids, which takes into account the characteristics and application of two-terminal location methods and one terminal location methods. Since two-terminal method is relatively easier, it is firstly adopted to recognize the fault distance approximately. Then, the accurate arriving times of wave fronts are obtained by analyzing the relationship between this approximate distance and the line parameters, which involve the reflected wave fronts from the fault point and the opposite terminal of fault line. Finally, accurate results are obtained. The method not only evades errors caused by synchronization system in global position system（GPS）, but also overcomes the difficulty in recognizing traveling-wave fronts. Moreover, we establish a 35 kV radial network model in PSCAD to simulate variable parameters including fault distances, grounding resistance, and fault types. The arriving times of wave fronts in the results are compared with the fault location results from two-terminal method, which indicates that the distance error is less than 100 m. It is concluded that, while confirming the one and two-terminal methods mutually, the proposed method successively improves the fault location accuracy of one-terminal methods.

关 键 词：故障定位 行波 小波分析 同步对时 GPS PSCAD 

分 类 号：TM862[电气工程—高电压与绝缘技术]