和应涌流对保护影响及对策的研究

发布时间：2018-01-08 23:18

本文关键词：和应涌流对保护影响及对策的研究　出处：《山西大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着经济社会的不断进步,科学技术与信息化的发展壮大,全球资源和能源暴露出越来越多的问题,这些问题也重重冲击着电力行业。面对可持续发展提出的要求,敢于正视问题,勇于承担责任的电力行业积极作出响应,全力推动智能电网的向前发展,这也促使对继电保护装置性能的加强必须落到实处。保护装置作为电力系统的第一道防线,以及变压器在电力系统中关键地位,使得变压器保护与整个电力系统的关系为牵一发而动全身,正因如此,对变压器保护的深入研究显得至关重要。本文主要研究的是变压器和应涌流,首先对和应涌流的产生过程的理论进行分析,然后使用MATLAB软件搭建了三种类型的和应涌流模型,对和应涌流的产生和部分影响因素进行了直观生动的仿真实验。在仿真过程中,本文在已有研究结论的基础上,创新的研究了部分因素,这些因素在之前的研究中被忽略,但是却对和应涌流有着不可忽视的影响。本文还搭建了一种更贴合实际运行状况的混联模型,将串并联变压器两种情况结合起来进行综合分析。总结了和应涌流对于变压器差动保护、零序电流保护、过电流保护及其他保护的影响。然后借助MATLAB中的小波工具箱,选择合适的小波基对和应涌流波形和各类变压器内部故障电流的波形进行分解重构,对重构后的波形进行归纳分析,根据小波变换后和应涌流波形的独有特征提出一条理论,作为鉴别和应涌流的依据；最后本文利用智能电网环境下数字化变电站的优势,提出防止和应涌流影响保护误动的一些简单易行的方法。
[Abstract]:With the continuous progress of the economic and social development, science and technology and information technology growth, global energy and resources exposed more and more problems, these problems had impact on the power industry. Facing the sustainable development request, the courage to face the problem of electric power industry, the courage to assume responsibility actively respond to push forward the development of smart grid. This also led to the relay protection device must be carried out to strengthen the performance of the protection device. As the first defense line of power system, and the transformer in the power system the key position, makes the relationship between transformer protection and the electric power system is far-reaching, because of this, in-depth study of transformer protection is very important. This paper mainly studies the transformer sympathetic inrush, first to analyze the sympathetic inrush process theory, and then use the MATLAB software To build three types of sympathetic inrush model on and inrush and some influence factors were simulated vividly. In the simulation process, based on the existing research results, some factors of innovation research, ignored the study of these factors in the past, but on and we should have a negligible impact on current. This paper also built a hybrid model closer to the actual operation situation, the situation of the two kinds of series parallel transformer integrated analysis are summarized. And the inrush current for transformer differential protection, zero sequence current protection, overcurrent protection and other protection effect. Then with the help of the wavelet toolbox in MATLAB, select the appropriate wavelet basis on sympathetic inrush waveform and various transformer internal fault current waveform decomposition and reconstruction, analyzed the reconstructed waveform, according to small A unique theory is put forward after the wave transformation and the characteristics of the inrush waveform. As a basis for identifying and responding to the inrush current, this paper puts forward some simple and feasible methods to prevent and correct the impact of the inrush current by using the advantages of the digitalized substation in the smart grid environment.

【学位授予单位】：山西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM774

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