计及负荷特性的电压稳定安全指标快速计算

Fast Algorithm of Voltage Stability Safety Index Including Load Characteristics

本文提出了计算电力系统电压稳定安全指标的新算法，该算法计及了负荷特性的影响，采用参数随运行状态变化的负荷模型，以负荷中动态负荷部分的有功功率最大作为临界点判据，并在网络求解中负荷采用导纳模型来克服临界点附近潮流收敛的困难。本文还给出了７节点系统和３１节点系统的算例。

A new algorithm is proposed to calculate the active power margin of critical load under the condition of keeping voltage stability with consideration of load characteristic effects. The adopted criterion of critical condition for voltage stability is if the active power absorbed by dynamic load reach the maximum value. During solving network equation,loads are represented by equivalent admittance,so this algorithm is free from the numerical difficuties associated with singular Jacobians. This algorithm can determine the critical load bus and the voltage stability margin. Numerical examples of a 7 bus system and a 31 bus system are presented.