低频振荡的功率振荡增量分布计算新方法

A New Algorithm of Oscillatory Active Power Increment Distribution in Low Frequency Oscillation Study

提出一种用于低频振荡研究的功率振荡增量分布计算新方法,该方法突出了发电机功率振荡增量分布对全网功率振荡增量分布的决定作用,推导得到发电机功率振荡增量与机组惯量、右特征向量元素之间简明的关系,使认识进一步清晰化,同时以此为基础为对实际系统进行功率振荡增量分布的计算和分析提供了新的思路。对中国发生的一次具有典型意义的低频振荡事件进行了功率振荡增量分布的计算和研究,验证了计算方法的正确性,并从功率振荡分布的角度,对局部电厂模式引发区间联络线大功率振荡问题进行了深入的分析。

A new algorithm for calculating oscillatory active power increment distribution in power systems is proposed. The algorithm demonstrates the dominant effect of generators on the whole system oscillation increment distribution. A simple relationship is derived between a generator＇ s power oscillation increment with its inertia and right eigenvector. The algorithm is verified by analyzing a typical low frequency oscillation in China. Furthermore, the mechanism of large scale of power oscillation on inter-connection lines initiated from local plant mode is studied from the aspect of oscillatory active power distribution.