负荷特性对基于奇异值分解法分析静态电压稳定的影响

The Influence of Load Characteristics on Static Voltage Stability Based on Singular Value Decomposition Analysis

随着电力系统规模不断扩大,电压稳定问题越来越受到人们的关注。对电力系统电压稳定影响一个关键的因素就是负荷特性。在前人研究成果的基础上,就负荷特性对奇异值分解法分析电力系统电压稳定性的影响做了一些工作。在考虑负荷特性的情况下,系统潮流雅可比矩阵最小特征值会有所变化。分析及IEEE-14节点系统计算表明,负荷模型是常用的ZIP模型时,潮流雅可比矩阵最小特征值相比于恒功率模型会有所增大;负荷模型是电动机类电压敏感负荷,在电压下降到一定程度时,潮流雅克比矩阵最小特征值相比于恒功率模型会有所减小;且采用不同的负荷模型对薄弱节点识别或是薄弱区域的划分也会有一定影响。

With the development of technology and the scale enlargement of the power system, the voltage sta- bility problem is attracting more and more attention. Load characteristic is one of the most important factors that affect the power system voltage stability. Based on previous studies, influences on static voltage stability is stud- ied by load characteristics based on singular value decomposition analysis in this paper. Considering the load characteristics, Jacobian matrix minimum eigenvalue will change. By using IEEE-14 node system as a case of a- nalysis, it is explained that when load model is commonly used ZIP model, the Jacobian matrix minimum eigen- value will be higher;Load model is voltage sensitive load as induction motor, when the voltage decreases to cer- tain degree, the Jacobian matrix minimum eigenvalue will become lower. And different conclusions on weak node identification or weak area division will be acquired when different load characteristics considered.