考虑OPGW线影响的输电线路短路电流相分量计算方法的研究

发布时间：2018-07-04 07:13

本文选题：OPGW线 + 架空输电系统　；参考：《华北电力大学(北京)》2016年硕士论文

【摘要】：在我国现代大规模电力系统中,大部分110kV及以上电压等级的架空输电线路均采用双架空地线配置,目前的趋势是采用OPGW线来取代普通架空地线。本文提出基于相分量模型的改进双侧消去法,在考虑OPGW线影响的架空输电系统发生单相接地短路后,能够同时计算接地短路电流和OPGW线上短路电流的分布情况。根据杆塔之间的档距,本文将复杂架空输电系统分割成块,把每个档距区间的所有相导线和OPGW线看作一个整体来分析,然后使用改进双侧消去法进行求解。通过块矩阵的优化,揭示出改进双侧消去法的向前推导和向后推导数学本质,然后再把各块通过交接点联系起来合并计算,得到架空输电系统接地短路电流和OPGW线上短路电流的分布。同时与先计算出接地短路电流,再通过网孔法计算OPGW线上短路电流的方法进行比较,分析两者计算结果的差别和原因,进一步说明本文所提出方法的计算结果更符合工程需要。基于本文所述理论,开发完成了一套软件计算系统。该软件计算系统内置了目前主流电压等级下的典型杆塔型号,能够实现杆塔参数的直接调用,计算方便快速。进一步,本文通过EMTP仿真算例,将软件的计算结果和仿真结果进行比较,分析了两者结果的差别和原因,验证本文方法理论和软件计算结果的正确性。本文依托开发的软件计算系统,并结合实际的电力线路算例,对可能影响OPGW线上短路电流分布的两个因素进行了分析,得到了在架空输电线路建设中,应充分考虑所分析这两个因素的结论。依托工程项目的背景,开发设计了OPGW线在线监测诊断的硬件装置,具体包括：OPGW监测终端、智能集中器和主站后台。在软件和硬件的支撑下,本文为国网公司某条110kV的示范线路设计了一套对OPGW线在线监测诊断的方案,监测OPGW线是否处于可靠的运行状态,以实现将本文的研究内容投入到实际工程项目中的目的。
[Abstract]:In modern large-scale power systems in China, most overhead transmission lines with voltage levels of 110 kV and above are equipped with double overhead ground lines. At present, OPGW lines are used to replace ordinary overhead ground lines. An improved two-side elimination method based on phase component model is proposed in this paper. After the single-phase grounding short-circuit occurs in the overhead transmission system considering the influence of OPGW line, the distribution of the grounding short-circuit current and the short-circuit current on the OPGW line can be calculated simultaneously. According to the distance between poles and towers, the complex overhead transmission system is divided into blocks, and all phase conductors and OPGW lines in each interval are analyzed as a whole, and then solved by the improved bilateral elimination method. Through the optimization of block matrix, the mathematical essence of forward derivation and backward derivation of the improved bilateral elimination method is revealed. The distribution of grounding short circuit current and short circuit current on OPGW line are obtained. At the same time, compared with the method of calculating the grounding short-circuit current first and then calculating the short-circuit current on OPGW line by the mesh method, the difference and reason of the calculation results are analyzed, and it is further proved that the calculation results of the method proposed in this paper are more in line with the engineering needs. Based on the theory described in this paper, a software computing system is developed. The software has built in the typical type of pole tower under the current mainstream voltage level, which can realize the direct transfer of the parameters of the pole and tower, and the calculation is convenient and fast. Furthermore, through the EMTP simulation example, this paper compares the software results with the simulation results, analyzes the differences and reasons between the two results, and verifies the correctness of the method theory and the software calculation results. In this paper, based on the software calculation system developed and combined with the actual power line calculation examples, two factors that may affect the distribution of short-circuit current on OPGW line are analyzed, and the results are obtained in the construction of overhead transmission line. The conclusions of these two factors should be fully taken into account. Based on the background of the project, the hardware device for on-line monitoring and diagnosis of OPGW line is developed and designed, which includes the: OPGW monitoring terminal, intelligent concentrator and main station backstage. Under the support of software and hardware, this paper designs a set of on-line monitoring and diagnosis scheme of OPGW line for a 110kV demonstration line of China National Network Company to monitor whether OPGW line is in a reliable operation state. In order to achieve the purpose of putting the research content of this paper into the actual project.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM75;TM713

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