A method of margin sensitivity analysis for local voltage stability index is presented. The voltage stability margin of load node is deduced based on local voltage stability index to identify VWN (Voltage Weak Node) and VWNS(Voltage Weak Node Set),which has fixed upper and lower bounds,not affected by the mode of load growth. The margin sensitivity of local voltage stability index is defined to determine the load nodes,which are strongly correlating with the VWNS,and the effect of their reactive power fluctuation on the voltage of VWNS is analyzed. The introduced method is applied to the reactive power compensation device and the simulative results for the IEEE 14-bus test system show its feasibility and effectiveness.%提出一种基于局部电压稳定指标的裕度灵敏度分析新方法.以局部电压稳定指标为基础推导出负荷节点电压稳定裕度,该裕度具有确定的上、下界,且不受负荷增长方式影响；利用负荷节点电压稳定裕度有效识别了系统电压弱节点和弱节点集合；定义局部电压稳定指标的裕度灵敏度,确定与弱节点集合强相关的负荷节点,分析弱节点集合邻域节点无功波动对弱节点集合电压影响程度；最后将所提方法应用于系统无功补偿装置配置中,典型系统的仿真结果证明了所提方法的可行性和有效性.
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