架空线—电缆混合输电线路行波故障测距方法研究

发布时间：2018-06-27 10:32

本文选题：电缆 + 架空线　；参考：《山东理工大学》2016年硕士论文

【摘要】：随着电网的不断改造和升级,涌现出越来越多的架空线-电缆混合输电线路。对于混合输电线路,由于在连接点处行波会发生复杂的折反射现象,而且行波在架空线和电缆两种线路中的传播速度也不一样,这些因素导致适用于均匀输电线路的行波故障测距方法在混合线路故障测距中难以应用。针对高压混合输电线路,目前现场应用比较广泛的是双端行波故障测距方法。首先,进行故障区段的选择,然后,利用双端法给出测距结果。它的缺点是测距精度受线路给定长度误差以及同步时钟误差的影响。本文针对不同结构的高压混合输电线路,提出相应的组合行波故障测距方法,测距结果由单端原理给出,测距精度较高。本文主要工作如下:(1)分析了故障行波在A型混合输电线路和B型混合输电线路中的折反射特点,并推导了行波从电缆线路经过电缆与架空线的连接点向架空线路传播时幅值和极性的变化情况,以及行波从架空线路经过电缆与架空线的连接点向电缆线路传播时幅值和极性的变化情况。在此基础上,分析了行波穿越一段线路时,行波的折反射特性。(2)针对任意结构的混合输电线路,提出一种基于多端信息的混合输电线路组合行波故障测距方法,首先利用混合线路两侧所测初始行波到达的时间差值来判别故障发生在架空线段还是电缆段,再利用故障路段两侧测量装置所采集的故障信息来进行初步故障测距,根据初步故障测距结果选出正确的单端测距结果。(3)针对A型混合输电线路和B型混合输电线路,提出一种基于双端信息的混合输电线路组合行波故障测距方法。首先利用故障初始行波到达线路两侧的时间差来判定故障区段,再由单端法给出准确的测距结果。(4)通过PSCAD分别建立A型混合输电线路和B型混合输电线路仿真模型,分别模拟混合输电线路不同位置发生接地故障来获取故障信息,借助MATLAB编程处理数据,对本文所提出的混合线路组合行波故障测距方法进行仿真验证。本文所提出的混合输电线路组合行波故障测距方法,可以由单端测距方法给出准确的测距结果,测距精度较高。在混合线路发生故障后,能够可靠的定位到故障点,具有良好的工程应用前景。
[Abstract]:With the continuous transformation and upgrading of the power grid, more and more overhead-cable hybrid transmission lines have emerged. For hybrid transmission lines, the traveling wave at the connection point will have complex refraction phenomenon, and the traveling wave will propagate at different speeds in the overhead line and cable line. These factors make the traveling wave fault location method suitable for uniform transmission lines difficult to be applied in hybrid line fault location. Two-terminal traveling wave fault location method is widely used in high voltage hybrid transmission line. First, the fault section is selected, and then the location result is given by using the dual-terminal method. Its shortcoming is that the ranging accuracy is influenced by the error of the given length of the line and the error of synchronous clock. In this paper, a combined traveling wave fault location method is proposed for HV hybrid transmission lines with different structures. The location results are given by the principle of single terminal, and the accuracy of fault location is high. The main work of this paper is as follows: (1) the characteristics of fault traveling wave in A hybrid transmission line and B hybrid transmission line are analyzed. The variation of amplitude and polarity of traveling wave propagating from cable line to overhead line through the connection point between cable and overhead line is deduced. And the variation of amplitude and polarity of traveling wave propagating from the connection point between cable and overhead line to cable line. On the basis of this, the characteristics of travelling wave refraction when traveling wave traverses a section of transmission line are analyzed. (2) for a hybrid transmission line with arbitrary structure, a hybrid traveling wave fault location method based on multi-terminal information is proposed. First, the time difference between the initial traveling waves measured on both sides of the hybrid line is used to determine whether the fault occurred in the overhead section or the cable segment, and then the fault information collected by the measuring devices on both sides of the fault section is used to carry out the preliminary fault location. According to the preliminary fault location results, the correct single-terminal location results are selected. (3) for A hybrid transmission lines and B hybrid transmission lines, a combined traveling wave fault location method based on two-terminal information for hybrid transmission lines is proposed. First, the fault section is determined by the time difference between the two sides of the fault initial traveling wave, and then the accurate location results are given by the single terminal method. (4) A hybrid transmission line and B hybrid transmission line simulation model are established by PSCAD, respectively. The fault information is obtained by simulating the ground fault in different locations of hybrid transmission lines, and the combined traveling wave fault location method of hybrid transmission lines proposed in this paper is verified by MATLAB programming. The combined traveling wave fault location method for hybrid transmission lines presented in this paper can give accurate location results by single terminal location method, and the location accuracy is high. After the fault of the hybrid line, it can locate the fault point reliably, and has a good prospect of engineering application.
【学位授予单位】：山东理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM75

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