薄弱电压节点的在线辨识

An Algorithm for Online Identification of Nodes with Weak Voltage Stability

提出了以发电机节点无功变化量和负荷节点电压变化量为指标的电压薄弱节点识别方法,该方法仅需要相邻时刻的无功和电压变化量,因此计算速度很快,适合在线识别。以IEEE 9系统为算例,在负荷连续增长和短路情况下分别对系统的薄弱节点进行识别,并与传统的指标进行比较,结果表明,在负荷连续增长的情况下,文中的指标与传统指标均能实时跟踪电压薄弱节点,而在短路后发生振荡的情况下,传统指标很难快速跟踪。

A method to identify nodes with weak voltage stability, in which the reactive power variation of generator buses and voltage variation of load buses are taken as indices, is proposed. Because in the proposed method only variations of reactive power and voltage of adjacent moments are needed, so its calculation is rapid and it is suitable for online identification of nodes with weak voltage stability. Taking IEEE 9-bus system for example, under the conditions of continue load growth or short-circuit fault the nodes with weak voltage stability in power system are identified respectively, and the obtained results are compared with the results identified by traditional indices. Comparison results show that under continue load growth the real-time tracking of nodes with weak voltage stability can by implemented by both the proposed indices and traditional indices, however under the condition of short-circuit fault-post oscillation it is hard for traditional indices to rapidly trace nodes with weak voltage stability.