基于节点阻抗解析的电压稳定性评估

在ＺＬ－Ｖ空间中，通过节点负荷在该空间的非线性特性和电网对节点负荷的供电特性曲线（对应于Ｐ－Ｖ曲线的ＺＬ－Ｖ曲线），展示了扰动后第一、二类阻抗变化引发对运行点走向影响的规律，讨论了按这两种曲线比值确定性判据的问题。提出了集结负荷特性应充分考虑群体效应，并以异步电机动堵（逆）转概率分布为例，说明了考虑群体效应的途径。

VOLTAGE STABILITY EVALUATION BASED ON NODE LOAD IMPEDANCE ANALYSES

In z L-V space through the nonlinear characteristics of node load and the characteristics ( z L-V curves corresponding with P-V curves) which specify the supplying behavior from the power system to node load it is shown in this paper how does the interplay between 1st and 2nd mode of impedance variation exert influence on the trend of the operating point. This paper discussed the problem how to determine the voltage stability criterion according to the slope ratio between two sort of curves mentioned above. When the node load characteristics are assembled the crowd effect should be considered enough. As an example the stall (or inversion) phenomena of induction motors are explained how to consider the crowd effect with the aid of probability distribution during load characteristics assembling.