基于最小奇异值灵敏度的电压稳定薄弱节点研究

最小奇异值作为静态电压稳定指标已广泛应用于电力系统的稳定分析之中。在最小奇异值分析的基础上，给出了最小奇异值对负荷功率的灵敏度，提出将最小奇异值灵敏度用于薄弱节点的分析及无功补偿点的确定。以IEEE57节点系统为例，在考虑负荷平均增长的情况下，分析了负荷变化对最小奇异值的影响，确定了系统薄弱区域及最弱节点，算例表明在所确定的最弱节点处进行无功补偿，可更有效地提高系统电压水平和电压稳定性。

Study on Weak Buses of Voltage Stability Based on Sensitivity of Minimum Singular Value

As an index of static voltage stability the minimum singular value is widely used in power system stability analysis. On the basis of minimum singular value analysis, the sensitivity of minimum singular value to load power is derived and it is proposed that to apply minimum singular value in the analysis of weak buses and to determine which bus should be compensated. Taking IEEE 57-bus system for example, the influence of load variation on minimum singular value is analyzed while the loads are increased in average, then the weak region and the weakest bus in the power system are determined. Calculation example shows that it will be more effective for the improvement of system voltage level as well as voltage stability while the reactive power compensation is located at the determined weakest bus.