1100kV GIS中操作及雷电过电压的计算分析

发布时间：2018-05-08 01:38

本文选题：GIS + 特快速暂态过电压　；参考：《西安科技大学》2017年硕士论文

【摘要】：近年来,我国大力推动特高压输电工程的建设,并已成功建设和运行了一批特高压交流和直流输电工程。随着特高压输电技术的发展,全封闭气体绝缘变电站(Gas Insu1ated Substation,GIS)得到了广泛的应用,然而GIS变电站中的过电压对GIS设备绝缘水平的选择和系统安全可靠运行有着重要影响。因此,研究GIS变电站的操作过电压以及雷电过电压具有十分重要的意义。本文以某1100kVGIS变电站一期主接线为研究对象对特快速暂态过电压(VFTO)和雷电入侵波过电压进行了计算分析。首先,分析了 GIS中主要元件设备计算模型的建立方法以及参数的计算选取方法,基于ATP-EMTP建立了该1100kV GIS变电站的VFTO等效仿真计算模型,研究了该GIS变电站在隔离开关不同操作方式下所产生的VFTO,包括幅值和频域特性等,然后,分析了抑制VFTO的多种典型措施。最后,根据雷电波参数,建立了 GIS变电站雷电侵入波过电压等效仿真计算模型,应用双指数波和斜角平顶波两种波形模拟雷电流波,对GIS变电站的雷电侵入波过电压的特性进行了研究,分析了避雷器MOA对雷电过电压防护性能方面的影响。由仿真计算结果表明:各个电气设备测定节点处的VFTO在不同的操作方式下的变化程度不同;在隔离开关合闸操作情况下所产生的VFTO幅值低于隔离开关分闸操作产生的VFTO幅值,在分闸情况下频率振荡分量更高;距离隔离开关操作点越近,相应的测定节点的VFTO幅值和频率也越大;装设避雷器(MOA)、分合闸电阻、铁氧体磁环对VFTO均有一定程度的抑制作用,但这些抑制措施互有优缺点;采用等值斜角波模拟雷电流得到的最大过电压值比采用双指数波模拟得到的值要偏大,但是考虑输电线路和杆塔因素时,最大过电压值却较为接近;避雷器MOA对GIS各个设备上的雷电过电压都有较好的防护性能。
[Abstract]:In recent years, China has vigorously promoted the construction of UHV transmission projects, and has successfully constructed and operated a number of UHV AC and DC transmission projects. With the development of UHV transmission technology, Gas Insu1ated Substation (GIs) has been widely used in fully enclosed gas insulated substations. However, the overvoltage in GIS substation has an important influence on the selection of insulation level of GIS equipment and the safe and reliable operation of the system. Therefore, it is of great significance to study the operating overvoltage and lightning overvoltage of GIS substation. In this paper, the transient overvoltage (VFTO) and the lightning intrusion wave overvoltage of a 1100kVGIS substation are calculated and analyzed. Firstly, the method of setting up the calculation model of the main components and equipment and the method of selecting the parameters in GIS are analyzed. Based on ATP-EMTP, the VFTO equivalent simulation model of the 1100kV GIS substation is established. In this paper, the VFTO produced by the GIS substation under different operation modes of the disconnector is studied, including amplitude and frequency domain characteristics, etc. Then, several typical measures to suppress VFTO are analyzed. Finally, according to the lightning wave parameters, the equivalent simulation model of lightning invading wave overvoltage in GIS substation is established. Two kinds of waveforms, double exponent wave and inclined flat-top wave, are used to simulate the lightning current wave. The characteristics of lightning intrusion wave overvoltage in GIS substation are studied, and the influence of lightning arrester MOA on the protection performance of lightning overvoltage is analyzed. The simulation results show that the variation of VFTO at each electrical device is different under different operation modes, and the amplitude of VFTO generated under the condition of switching off is lower than that of VFTO produced by switch opening operation. The higher the frequency oscillation component is when the switch is open, the greater the VFTO amplitude and frequency of the corresponding measured node are, the closer to the operating point of the isolator switch, the greater the VFTO amplitude and frequency of the corresponding measuring node. The installation of the arrester, the closing resistance and the ferrite magnetic ring can all inhibit the VFTO to a certain extent. However, these suppression measures have advantages and disadvantages, the maximum overvoltage value obtained by using equivalent diagonal wave to simulate lightning current is larger than that obtained by using double exponential wave simulation, but when the transmission line and tower factors are taken into account, The maximum overvoltage value is close but the lightning arrester MOA has better protection performance to the lightning overvoltage on each GIS equipment.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM63

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