电力电缆故障测距方法的研究

发布时间：2018-05-11 05:52

本文选题：FIMD + 小波变换　；参考：《东北农业大学》2017年硕士论文

【摘要】：随着我国经济的快速发展,城市现代化进程的加快,电力电缆的应用也变得越来越广泛。然而,电力电缆在运行的过程中,经常会出现各种各样的故障,破坏电力系统的正常运行,甚至会损坏设备,若故障因长时间存在而得不到解决,将会造成不必要的经济损失。为了满足用户的供电需求以及电力系统的安全稳定运行,快速准确地检测出电力电缆故障点位置,有利于及时消除故障,避免输电线路中电缆的损坏。针对电力电缆故障定位误差大问题,本文结合电力电缆的故障类型,提出一种基于FIMD和小波变换模极大值导数的双端行波测距方法,实现电力电缆故障测距。本研究首先对电力电缆国内外测距技术进行了阐述,对电缆的故障类型及造成故障的因素进行了介绍。基于此基础,利用PSCAD仿真软件对电力电缆建立模型,对各测量点的电流突变量进行相模变换,用Matlab进行数据优化和处理;然后,对变换后的模分量基于FIMD和小波变换模极大值理论求导数,查找出暂态电流信号的奇异点,进而得到故障两端的时间;根据首个暂态行波的奇异点来确定初始行波到达线路两端的时间,再利用改进的双端行波测距算法,计算出故障距离。同时,本文对电力电缆在线监测系统进行了硬件和软件的设计,并对所设计的装置进行了设备选型,且进行功能描述;再结合软件技术,对故障测距系统进行软件设计,通过软、硬件的有效结合,来实现对故障数据的采集和分析。最后,对本文所应用的算法进行验证分析,实际故障距离与所测得的数据进行了对比分析,其误差小于0.4%,完全满足预期目标,有利于提高故障测距精度,也验证了该方法对于电力电缆的故障测距系统具有可行性,为电力电缆的故障测距提供了理论价值。
[Abstract]:With the rapid development of our economy and the acceleration of urban modernization, the application of power cable has become more and more extensive. However, in the process of power cable operation, there are often a variety of faults, which destroy the normal operation of the power system, and even damage the equipment. If the fault can not be solved for a long time, it will cause unnecessary economic losses. In order to meet the demand of power supply and the safe and stable operation of power system, the location of power cable fault point can be detected quickly and accurately, which is helpful to eliminate the fault in time and avoid the damage of cable in transmission line. Aiming at the problem of large fault location error of power cable, this paper presents a dual-terminal traveling wave location method based on FIMD and wavelet transform modulus maximum derivative to realize power cable fault location. In this paper, the location technology of power cable at home and abroad is introduced, and the fault types and the factors causing the fault are introduced. Based on this foundation, the power cable is modeled by PSCAD simulation software, and the current abrupt change of each measuring point is transformed into phase mode, and the data is optimized and processed by Matlab. Based on the modulus maximum theory of FIMD and wavelet transform, the singular point of transient current signal is found out, and the time at both ends of the fault is obtained. According to the singularity point of the first transient traveling wave, the time of initial traveling wave arriving at both ends of the line is determined, and the fault distance is calculated by using the improved two-terminal traveling wave location algorithm. At the same time, the paper designs the hardware and software of the power cable on-line monitoring system, and carries on the equipment selection and the function description to the designed device, and then combines the software technology, carries on the software design to the fault location system, Through the effective combination of software and hardware, the collection and analysis of fault data are realized. Finally, the algorithm used in this paper is verified and analyzed. The actual fault distance is compared with the measured data. The error is less than 0.4, which fully meets the expected goal and is conducive to improving the accuracy of fault location. The feasibility of this method for power cable fault location system is also verified, which provides theoretical value for power cable fault location.
【学位授予单位】：东北农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75

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