静态电压稳定分析中L指标与特征值换算关系及L阈值确定方法  

Exchange Relation With Eigenvalues and Threshold Determination of L Index for Power System Static Voltage Stability Analysis

作　　者：李生虎[1] 夏伟健 叶剑桥 张奥博 张晓艳[1] LI Shenghu;XIA Weijian;YE Jianqiao;ZHANG Aobo;ZHANG Xiaoyan(Anhui Province Key Laboratory of Renewable Power Utilization and Energy Conservation(Hefei University of Technology),Hefei 230009,Anhui Province,China)

机构地区：[1]新能源利用与节能安徽省重点实验室(合肥工业大学),安徽省合肥市230009

出　　处：《电网技术》2023年第9期3828-3835,共8页Power System Technology

基　　金：国家自然科学基金项目(51877061)。

摘　　要：新能源并网和辅助服务弱化,降低了电力系统静态电压稳定性。特征值分析和L指标是研究静态电压稳定的常见方法。如何比较这2种方法得到的稳定指标、如何根据前者稳定裕度确定后者阈值,目前未见研究。该文联立潮流方程,提出L指标对负荷的灵敏度。以此为桥梁,提出L指标和特征值间换算关系。基于上述灵敏度对负荷进行排序,提出改善静态电压稳定措施。根据特征值稳定裕度和L指标间换算关系,提出确定L指标阈值方法。仿真结果验证了所提算法的正确性和有效性。With the integration of renewable power and the lack of ancillary service,the static voltage stability of the power system is reduced.The eigenvalue analysis and the L index are the common methods to study the static voltage stability.There has been rare study on how to compare the stability indices obtained by the two methods and how to determine the threshold of the latter according to the stability margin of the former.By combining with the power flow equations,the sensitivity model of the L index to the bus loads is proposed.With these loads as the bridge,the exchange relation between the L index and the eigenvalues is proposed.With the above sensitivities,the load buses are sorted to find the measures to improve the static voltage stability.The threshold of the L index is proposed according to the stability margin of the eigenvalues and the exchange relation.The simulation results verify the accuracy and effectiveness of the proposed methods.

关 键 词：静态电压稳定 L指标 特征分析 灵敏度分析 换算关系 稳定阈值 

分 类 号：TM721[电气工程—电力系统及自动化]