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电网技术  2012 

低频振荡扰动源机组的自动定位方法

, PP. 265-269

Keywords: 低频振荡,扰动源,发电机组,定位

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Abstract:

由于中国电网规模庞大,低频振荡现象时有发生,如何快速确定低频振荡扰动源机组并及时将其切除,对保障电网的安全稳定运行意义重大。提出一种自动确定低频振荡扰动源机组的定位新方法,利用三次样条插值函数对电压极大值进行曲线拟合,提取各发电机出口低压侧电压中的低频振荡扰动变量,利用顺序相似度函数提取各低频振荡扰动变量间时差和先后次序,进而确定低频振荡扰动源所在位置。通过一个4机无穷大系统模型的仿真分析,验证该方法的正确性和准确性。理论分析和仿真结果表明该方法能够快速自动确定低频振荡扰动源机组的位置;可大大减少低频振荡在电网中的持续时间。

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