电子式互感器在智能变电站中的应用研究

发布时间：2018-11-06 13:42

【摘要】：为实现电力系统的经济、安全可靠和可持续发展,我国智能电网技术发展迅速。电子式互感器作为新技术应用到智能变电站中,近几年成为研究的热点,其技术水平和产品质量会影响智能变电站的安全可靠运行。本文阐述了课题研究的背景和意义,总结了国内外电子式互感器的应用和研究现状,并介绍目前应用的几种电子式互感器的结构、工作原理、技术特性以及优缺点。比如:Rogowski线圈式、LPCT、磁光玻璃式、全光纤电流互感器;分压型、全光纤电压互感器等。本文研究的重点分为3个部分:首先,通过电子式互感器其应用方式、应用情况、运行情况总结有源电子式互感器和无源电子式互感器存在个性问题与共性问题,并结合智能变电站应用情况和现场运行经验给出解决建议。其次,针对电子式互感器在应用中存在的特快速瞬态过电压(VFTO)问题作出研究。在分析VFTO产生机理、影响因素及特性等原理的基础上,对GIS主要设备给出等效仿真模型,以实际变电站主接线图和GIS布置图为依据,用EMTP仿真软件搭建仿真电路,对常见的7种隔离开关操作方式的VFTO进行仿真计算,得到各主要电气设备的VFTO幅值。分析了仿真计算结果,分析了变压器入口电容值对VFTO幅值的影响,以及针对电子式互感器在GIS站中的VFTO采取防护措施,并对采取措施前后电子式互感器VFTO试验作了对比。最后,研究电子式互感器在智能变电站中的应用选型及优化配置。对电子式互感器的选型要求、配置原则以及在选择互感器时关注的VFTO问题作出分析,并运用全寿命周期原理对实际变电站中互感器的3种选择方案进行技术性、经济性比较和VFTO特性分析,最后得出最佳配置方案。
[Abstract]:In order to realize the economic, safe, reliable and sustainable development of power system, smart grid technology is developing rapidly in China. Electronic transformer is applied to intelligent substation as a new technology. In recent years, it has become a hot topic of research. Its technical level and product quality will affect the safe and reliable operation of intelligent substation. This paper describes the background and significance of the research, summarizes the application and research status of electronic transformers at home and abroad, and introduces the structure, working principle, technical characteristics, advantages and disadvantages of several electronic transformers used at present. For example: Rogowski coil type, LPCT, magneto-optic glass type, all-fiber current transformer; voltage-splitting type, all-fiber voltage transformer and so on. The research focus of this paper is divided into three parts: firstly, through the application mode, application situation and operation situation of electronic transformer, we summarize the existence of individual problems and common problems in active electronic transformer and passive electronic transformer. Combined with the application of intelligent substation and field operation experience, some suggestions are given. Secondly, the (VFTO) problem of extremely fast transient overvoltage is studied in the application of electronic transformer. On the basis of analyzing the principle of VFTO generation, influencing factors and characteristics, the equivalent simulation model for the main equipment of GIS is given. Based on the actual substation main wiring diagram and GIS layout diagram, the simulation circuit is built with EMTP simulation software. The VFTO amplitudes of the main electrical equipments are obtained by simulating the VFTO of the seven kinds of disconnector operation modes. The simulation results are analyzed, and the influence of transformer inlet capacitance on VFTO amplitude is analyzed, and the protective measures against VFTO of electronic transformer in GIS station are analyzed, and the VFTO test of electronic transformer before and after taking measures is compared. Finally, the application and optimization of electronic transformer in intelligent substation are studied. This paper analyzes the selection requirements of electronic transformers, configuration principles and VFTO problems concerned in selecting transformers, and makes a technical analysis of the three schemes of transformer selection in practical substations using the principle of full life cycle. Finally, the optimal configuration scheme is obtained by comparing the economy and analyzing the characteristics of VFTO.
【学位授予单位】：湖南工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM63;TM76;TM45

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