基于潮流计算的电压稳定性指标的比较研究

Comparative Study of Voltage Stability Indices Based on Load Flow Calculation

将 3种基于潮流雅可比矩阵对角元素的电压稳定性指标 (IPi,IQi,Ii) ,与 2种同样是基于潮流计算的常用的电压稳定性指标 (L ,Idr) 在反映电力系统接近电压不稳定程度方面提供信息的有效性进行了比较。这种比较是在系统不同的运行方式下进行的 ,系统运行方式的改变是通过改变负荷的功率因数以及系统X/R的比值实现的。最后通过 1个算例证实了这 3种指标的有效性。

Three voltage stability indices (I Pi ,I Qi ,I i)based on diagonal elements of load flow Jacobi matrix are compared the effectiveness with two commonly used indices (L,I dr )based on load flow calculation in providing information about the proximity of voltage instability of a power system. The comparison is carried out over a wide range of system operating conditions by changing the load power factor and feeder X/R ratios.As conclusion, the effectiveness of the three indices is proved by a practical example.