基于对称分量模型的电力系统短路故障计算方法

A NEW METHOD OF POWER SYSTEM FAULT CALCULATION BASED ON SYMMETRICAL COMPONENTS

对称分量法及其序网联接技术是电力系统故障处理的传统方法。但目前存在着许多因素引起了网络参数的三相不对称,以至序网无法分离,序网联接技术失效。该文以相分量故障处理方法为依据,提出了一种相分量坐标下的故障向量变换法:采用多态计算技术,用矩阵变换代替传统的数值计算,用不同的矩阵参数表达各种对称和不对称短路故障的特点,以使用统一的公式计算短路故障。将该方法推广至对称分量坐标下,无需序网联接就可以实现对称分量坐标下短路故障处理。简化了短路电流计算编程的难点。分析了组合故障等情况,给出了新方法的处理结果,用实例证明了该方法简单实用的优越性。

Symmetrical components method and its sequence network connection technique are conventional way on fault analysis of power system. But there are many factors that render a power system network unbalanced, so that sequence network cannot be decoupled and technique of sequence network connection is failed. This paper presents a new way, fault vector transformation method in phase coordinates, based on fault analysis of phase components. Polymorphic calculation technique is used with matrices transformation instead of data calculation. Various matrices parameters are listed in terms of all kinds of symmetrical and unsymmetrical short circuit faults. A universal equation is used to calculate all short circuit faults. The equation in symmetrical components coordinates can be transformed from phase coordinates, which calculates the short circuit faults without sequence network connection. The results of the method are given including simple faults and some combined faults. The examples show the advantages of the method.