基于同步相量测量的实时电压稳定分析方法

Synchronous Phasor Measurments Based Real Time Voltage Stability Analysis Method

提出了一种基于同步相量测量的实时电压稳定分析方法。该算法利用局部同步相量测量信息就地进行实时在线参数辨识,在辨识后的2节点等值系统和静态负荷模型的基础上,根据一种节点电压稳定性指标实时进行电压稳定性估计。该方法基于π型支路模型和静态负荷参数模型,辨识局部2节点等值系统,可以更好地反映线路的无功特性以及负荷参数的变化。最后,结合新英格兰39节点系统的仿真结果,对不同等值系统模型及负荷模型进行对比,结果表明所提出的方法能提供更加精确的电压稳定估计指标,验证了该方法的可行性。

A real time voltage stability analysis method based on synchronous phasor measurements is presented, in which the external equivalent system and the static load models can be identified in real time based on the local synchronous phasor measurements of each load bus and a voltage stability index can be used to assess the system＇ s voltage stability. The methods based on π equivalent branch model and the ZIP load model can identify a local two-bus equivalent system, which reflects the branch reactive-power characteristic better and considers the parameter changes of loads more precisely. Finally, combining with simulation results of New England 39-bus system and contrasting with other different equivalent system models and load models, the proposed method can be proved to provide a more accurate voltage stability index and to be feasible.