考虑直流分量的短路电流衰减实用计算方法研究  

Study on Practical Calculation Method of Attenuated Short-Circuit Current With the DC Component Considered

作　　者：曹炜 陈春阳 周明 

机构地区：[1]上海电力学院电气工程学院,上海市杨浦区200090 [2]国网随州供电公司,湖北省随州市441300

出　　处：《电网技术》2017年第12期4054-4060,共7页Power System Technology

摘　　要：目前,短路电流实用计算中缺乏同时考虑短路电流周期分量和非周期分量衰减的方法,特别是针对非周期分量衰减计算的相关研究更少。提出不用传统计算曲线、考虑多机复杂电网实际接线和实际机组参数的短路电流周期分量衰减实用计算方法。此外,提出考虑实际电网结构用转移阻抗求取非周期分量的衰减。基于所提方法完成短路电流计算模块的开发,可直接对BPA数据格式的电网进行短路计算,计算结果经与用EMTP对同一案例计算结果的比较分析,验证了该模块的准确性。At present,in short-circuit current calculation,it is lack of a practical method for simultaneously considering attenuation of periodic and aperiodic components.In particular,there are few studies on calculation of aperiodic component attenuation.Instead of using traditional computational curve,a practical method for calculating attenuation of the periodic component is presented considering actual topological structure of multi-machine complex power grid and actual generator unit parameters.Based on actual power grid structure,a method of calculating attenuation of the aperiodic component is also proposed using transfer impedance theory.A short circuit current calculation module is developed with the presented method and used to analyze the short circuit current of power grid in BPA data format.The developed module is used to calculate examples and its accuracy is verified by comparison between calculated results of the module and calculated results with EMTP.

关 键 词：衰减 复杂电网 计算曲线 转移阻抗 时间常数 短路电流 周期分量 非周期分量 直流分量 

分 类 号：TM721[电气工程—电力系统及自动化]