新型低频减载方案的研究

Study on a New Scheme of Under-frequeucy Load Shedding

在突然恶性事故情况下 ,电力系统产生严重的频率下降 ,导致系统崩溃和大面积停电。低频减载装置是一种抑制频率下降的有效方法 ,它依据测量到的频率值 ,按轮次分步骤地减掉负荷。这里介绍一种自适应型低频减载装置的方案 ,它依据频率和频率的变化率 ,动态地确定减负荷装置的动作情况。利用微型计算机实现这一方案完全可行。

Under malignant emergency conditions,the frequency of power system seriously and consequently drops down which lead,system to collapse and a large area outage.Under frequency load shedding (UFLS) is a globally accepted practice to handle this situation.Most UFLS schemes use pre specified step sizes based upon frequency measurements.This paper presents an adaptive scheme that uses both frequency and rate of change of frequency measurements to dynamically set ULFS relays.Recent developments in computer based frequency and rate of change of frequency relays makes this scheme both feasible and attractive.