中文摘要：

提出了一种可应用于大规模电网电压稳定在线监测快速计算的简化L指标及其L-Q灵敏度分析新方法。针对实际电网的特点,以局部电压稳定指标（L指标）为基础,推导出负荷节点简化L指标。在此基础上,给出了简化L指标的全微分方程,借助全微分方程分析系统参数变化对电压稳定的影响;定义了电力系统L-Q灵敏度,定量分析了网络中负荷节点间的电压稳定相互影响关系,研究了不同电压失稳模式所涉及的区域划分,并就L-Q的物理意义进行了全面分析;比较了L-Q灵敏度分析方法与V-Q灵敏度分析方法的异同,给出了L-Q灵敏度分析方法的具体计算步骤。最后,将所提出的方法应用于New England 39节点、IEEE 118节点和IEEE 300节点系统中,算例仿真结果证明了所述方法的可行性和有效性。

英文摘要：

A new simplified L-index and L-Q sensitivity analysis method is proposed to monitor and control the voltage stability in large scale power systems.A simplified formula of local voltage stability L-index is presented according to the characteristics of the actual power systems.For voltage stability assessment,the differential equation of the simplified L-index is developed to obtain the sensitivity of L with respect to parameters.Various sensitivity analysis can be performed,such as L-Q sensitivity,which could be used to identify and analyze the interaction between voltage stability and load-bus reactive power injection.The physical meaning of L-Q sensitivity is comprehensively presented,then compared with the V-Q sensitivity and the calculation steps of L-Q sensitivity analysis method is given.The New England 39-bus,IEEE 118-bus and IEEE 300-bus test cases are used to numerically validate the feasibility and validity of the proposed method.