负荷不确定性电网的电压稳定性评价方法

Voltage Stability Assessment Method for Power System with Load Uncertainty

提出一种基于负荷不确定性电网的电压稳定性评价方法。在电网各节点及总负荷水平不确定、只能给出一个区间范围的情况下,首先定义了一种电压稳定性评价模型,采用边界定值法进行求解,找出一组最恶劣的负荷分布,使其在满足负荷取值范围的约束下离崩溃曲面的负荷距离最短。所述方法考虑了各节点和系统总负荷水平的不确定性,为电网的电压稳定性评估提供了一种新思路。在IEEE14和IEEE57节点系统中验证了所述算法的快速性和有效性。

A novel voltage stability assessment method considering load uncertainty is proposed. It is well known that bus load and total system load are uncertain, commonly only an interval range of load fluctuation can be assured, Firstly, a voltage stability assessment model is constructed, Then, a boundary fixing method is used to find out the worst set of load distributions, which is the closest to the collapse point within the fluctuation range of bus load and total load. The proposed method shed a new light on the voltage stability assessment of a power system with the load uncertainty. Finally, the computational speed and effectiveness of the proposed method is validated on IEEE 14-bus and IEEE 57-bus systems.