基于局部测量信息的戴维南等值参数分析  

Analysis on thevenin equivalent parameters based on local measurement information

作　　者：竺炜[1,2] 唐如[1] 

机构地区：[1]长沙理工大学电气与信息工程学院,湖南长沙410004 [2]中国电力科学研究院,北京100192

出　　处：《电力科学与技术学报》2012年第2期47-51,共5页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金(61040049);湖南省自然科学基金(11JJ6032);湖南省科技计划(2010FJ4095)

摘　　要：利用戴维南等值简化的电力系统模型可快速分析负荷点的电压变化趋势,但存在基于局部测量信息的等值参数求取难点.考虑负荷母线电压相位的变化,基于局部可测信息,重新分析戴维南等值的方法.并以等值电势相量为相位参考轴,求取等值参数初值,符合戴维南等值的逻辑;且全面考虑负荷变化和负荷母线电压相量、等值参数变化的关系,进行戴维南等值系统参数修正,体现负荷侧电压-负荷的实际特性,达到等值目的.算例验证了该等值系统的合理性和准确性.Based on a power system model simplified by Thevenin equivalent, the voltage changing trends at load points can be quickly analyzed. However, the local measurement information based on calculation of equivalent parameters is difficult to obtain. The local measurement information based Thevenin equivalent method was analyzed with voltage phase changing considered in this paper. In calculation of initial values, the phasor of equivalent electric potential was used as phase reference axis, complying with the logic of Thevenin equivalent. In the parameters correction, the relationship between load changes and the changes of the load bus voltage phasor or equiva- lent parameters were considered, The modified Thevenin equivalent system can clearly reflect the actual voltage-load characteristics on load side and obtain the equivalent parameters. Examples analysis results showed that the equivalent system is with high reasonableness and accuracy.

关 键 词：戴维南等值 参数修正 局部测量信息 电压-负荷特性 

分 类 号：TM71[电气工程—电力系统及自动化]