【摘要】 电压失稳本质上是一种局部现象,系统的电压稳定程度可以由最易于电压失稳的功率传输路径的电压稳定性来表征。文中应用局部电压稳定性指标确定薄弱负荷节点,并借助电气距离信息,从无功、有功传输路径两方面确定路径参与节点和关键功率源点,得到系统功率传输的薄弱路径集,通过等值判别最弱功率传输路径,将该路径的电压稳定性指标与关键发电机的无功储备指标相结合,评估整个系统的电压稳定程度。新英格兰10机39节点算例系统的仿真结果表明,该方法速度快、精度高,适合于在线应用。更多还原

【Abstract】 Voltage instability is essentially a local phenomenon. The voltage stability degree of a power system can be represented by that of the power transmission path, which is most prone to voltage instability. In this paper the local voltage stability index is used to determine weak buses in the power system. Then based on the electrical distance to the weak buses, participant buses and key power generating buses are selected for both reactive and active power transmission paths. Among the weak power transmission paths the weakest one is computed though an equivalent system. Finally the weakest path voltage stability index is used jointly with the key generators reactive power reserve index for voltage stability assessment of the whole system. Simulation results of the New England 39-bus test system demonstrate that the accuracy and speed of the proposed method can meet the need of on-line voltage stability assessment.更多还原