简单电力系统中波过程收敛性分析

Astringency Analysis on Wave Process in a Simple Power System

在分析电力系统时,传统的处理方法是如果输电线路的电磁暂态已经结束,就仅考虑机电暂态过程。本文以负荷节点电压代表系统状态,利用解析法分析了一个简单系统在不同情况下电磁暂态过程,得到了以节点瞬时电压代表的系统状态随时间变化的表达式,比较了不同情况下系统状态的变化过程,证明了传统的处理方法只是在一般情况下适用。而在特殊情况下,必须考虑输电线路的电磁暂态和这一过程中系统状态的变化规律。

When the power system stability problem is concerned, the traditional view is to suppose that the electromagnetic transient process is finished, and hence its propagation along the transmission ＇line can be neglected and only the electro-mechanical transient process should be considered. In this paper, an analytic method is proposed to study the electromagnetic transient process of transmission line in a simple system. The system state variation in different conditions are compared and it is proved that the traditional method fitted only in some common conditions. In a few extreme conditions, the electromagnetic transient, process of transmission line must be considered and the system state variations should also be studied.