配电网小电流接地故障仿真分析研究

发布时间：2018-01-14 01:16

本文关键词：配电网小电流接地故障仿真分析研究　出处：《山东大学》2017年硕士论文　论文类型：学位论文

【摘要】：单相接地故障是配电网运行中的一种常见故障,电网运行安全和科学研究需要均督促我们探索更加快速、准确地选线方法。由于小电流接地系统故障信息不明显、线路参数变化频繁、外部干扰多等诸多特点,真正可靠的选线方法仍待探索。随着电子信息技术、计算机技术的高速发展,利用快速提取并分析故障暂态信号的选线方式,将极大促进选线课题研究工作的开展。本文首先对小电流接地系统基本概念进行阐述,分析了系统发生单相接地故障的稳态和暂态特点。从提取内部信息和注入外部信号两个方面对现有选线方法进行归纳总结。采用Matlab/Simulink仿真平台,结合真实的曲阜市配电网数据对故障前后系统进行建模与计算。对仿真结果及其影响因素进行了深入研究,归纳总结了接地电阻、电压相位角、故障距离对系统故障电流的影响。提了基于小波分析的选线方法,给出了多个场景的仿真计算结果。将小电流接地系统单相接地故障数据输入到论文所提的基于小波分析的选线方法中,所得结果验证了上述方法的正确性、有效性,对日后实际工作的开展具有指导作用。
[Abstract]:Single-phase grounding fault is a common fault in distribution network operation. The safety of power grid operation and scientific research need to urge us to explore more quickly. Because the fault information of small current grounding system is not obvious, the line parameters change frequently, the external interference and so on many characteristics, the real reliable line selection method still needs to be explored. With the electronic information technology. With the rapid development of computer technology, the research work of line selection will be greatly promoted by using the method of fast extracting and analyzing fault transient signal. Firstly, the basic concept of small current grounding system is expounded in this paper. The steady-state and transient characteristics of single-phase grounding fault in the system are analyzed. The existing methods of line selection are summarized from two aspects of extracting internal information and injecting external signals. Matlab/Simulin is adopted. K simulation platform. Based on the real data of Qufu distribution network, the system is modeled and calculated before and after the fault. The simulation results and their influencing factors are deeply studied, and the grounding resistance and voltage phase angle are summarized. The influence of fault distance on the fault current of the system. A method of line selection based on wavelet analysis is proposed. The simulation results of several scenarios are given. The data of single-phase grounding fault of small current grounding system are input into the method of line selection based on wavelet analysis proposed in this paper. The results show that the method is correct. The validity has the guidance function to the future actual work development.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM862

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