电压稳定和功角稳定关系的平衡点分析

分析了一个典型系统的平衡点与负荷功率、发电机功率的关系，表明静态电压稳定和功角稳定本质上都可视为一种不稳定平衡点的模式，揭示了系统失稳模式随潮流改变而转变的现象，还指出了P—V曲线的下半分支和其他分支蕴含了丰富的系统分岔信息，可从中了解系统不稳定平衡点的产生和消失情况。对不同负荷模型的分析结果则说明了不同负荷模型会导致不同的失稳模式。所得结论具有普遍性，对深入研究复杂系统下电压稳定和功角稳定关系有一定的价值。

ANALYSIS OF THE RELATIONSHIP BETWEEN VOLTAGE STABILITY AND ANGLE STABILITY THROUGH EQUILIBRIUMS

Through investigating equilibrium points of a typical power system, this paper shows that voltage stability and angle stability can be linked by the unstable equilibrium points (UEPs)of the system. The unstable mode changes with the power flow mode of the system. The lower part and the other branch of the PV curve contain abundant information about system bifurcating, from which the situation of the UEPs can be learned. The analyzed results indicate that different load model can lead to different system unstable mode. The conclusions are general, and provide deeper understanding of the relationship between voltage stability and angle stability in complex power systems.