1、 毕 业 论 文（设 计） 届 电气工程及其自动化 专业 班级 题 目电力系统发生简单不对称短路时电流的计算 姓 名 学号 指导教师 职称 讲 师 二三 年 月 日 内 容 摘 要 随着电力事业的快速发展,电力电子新技术得到了广泛应用,出于技术、经济等 方面的考虑,500KV 及以上的超高压输电线路普遍不换位,再加上大量非线性元件的 应用电力系统的不对称问题日益严重。因此电力系统不对称故障分析与计算显得 尤为重要。 基于对称分量法的基本理论，对称分量法采取的具体方法之一是解析法，即把 该网络分解为正、负、零序三个对称序网，这三组对称序分量可分别按对称的三相 电路分解。计算机程序法。通过计算机形
2、成三个序网的节点导纳矩阵，然后利用高 斯消去法通过相应公式对他们进行数据运算,即可求得故障点的等值阻抗。 最后根据 故障类型选取相关公式计算故障处个序电流，电压，进而合成三相电流电压。 进行了参数不对称电网故障计算方法的研究。通过引计算机算法，系统介绍电 网参数不对称的计算机算法方法。根据断相故障和短路故障的特点，通过在故障点 引入计算机算法，给出了各种断相故障和短路故障的仿真计算。此方法以将故障电 网分为对称网络不对称网络两部分，在程序法则下建立起不对称电网故障计算统一 模型，根据线性电路的基本理论,并借助于相序参数变换技术完成故障计算。 关键词:参数不对称;电网;故障计算 Abstract
3、 With the rapid development of power industry ,power electronic technology has been widely used;For technical and economic consideration ,500kV and above transmission lies are generally not transposition ,together with the application of a large number of nonlinear ,the power system the growing prob
4、lem of asymmetry .therefore ,asymmetric power system fault analysis and calculation is very important . Based on the basic theory of symmetry is one of the specific method to resolve the law ,that to the network is decomposed into positive,negative and zero sequence network of the three symmetric se
5、quence ,these three groups of symmetry by symmetry sequence components,respectively Decomposition of three-phase circuits.Computer procedure .Sequence of three computer -based network node admittance matrix,and then use the appropriate formula by Gauss elimination method for data on their operations
6、,one can fault endpoint equivalent impedance.Finally,select the associated fault type fault Department calculated the sequence current voltage,and then synthesis of three-phase voltage and current. Parameters were calculated asymmetry of power failure.By means of a computer algorithm,the system describes a computer algorithm for asymmetric network parameters method.And under short circuit fault in the characteristic of the point of failure through the introduction of com
