提出了一种负荷区间下最小电压稳定域的求解方法。在电网各节点及总负荷水平不确定，且只能给出一个区间范围的情况下，首先定义了一个基于负荷区间的最小电压稳定域模型；然后采用线性规划法对其进行求解，找出一组最危险的负荷分布，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小。文中方法考虑了各节点和系统总负荷水平的区间性，为电压稳定性分析提供了一种新思路。IEEE14和57节点算例系统验证了所提算法的快速、有效性。

1．School of Information Engineering，Nanchang University，Nanchang 330031，Jiangxi Province，China；2．Jiangxi Ganxi Power Supply Company，Xinyu 338025，Jiangxi Province，China；3．School of Electronic Information and Electrical Engineering，Shanghai Jiaotong University，Minhang District，Shanghai 200240，China

A new method to solve minimal voltage stability region under load interval, i.e., the load with upper and lower limits, is proposed. Under the condition that the load level at power network nodes as well as the total load level are uncertain and only one interval range could be given, at first a minimum voltage stability domain model based on the interval load is defined; then this model is solved by linear programming (LP) to find out the worst load distribution and then to make the distance from this load distribution to the curve surface of voltage collapse minimum while the constraint of load interval range is satisfied. In the proposed method the interval property of load levels at each node and total load level are considered to offer a new thinking for voltage stability analysis. Simulation results of IEEE 14-bus system and IEEE 57-bus system show that the proposed method is fast and effective.

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