基于PMU量测的改进耦合最小二乘线路参数辨识  

Enhanced coupled recursive least squares algorithm for PMU-data based transmission line parameter identification

作　　者：王国松 唐建兴 刘明顺 马覃峰 陈锐 WANG Guosong;TANG Jianxing;LIU Mingshun;MA Qinfeng;CHEN Rui(Power Dispatching and Control Center of Guizhou Power Grid Co.,Ltd.,Guiyang 550002 Guizhou,China)

机构地区：[1]贵州电网有限责任公司电力调度控制中心,贵州贵阳550002

出　　处：《电力大数据》2021年第10期63-70,共8页Power Systems and Big Data

摘　　要：输电线路参数的准确程度对提高线路运行安全性与经济性有持续性影响。立足目前广泛应用PMU装置的现状,针对输电线路多变量线性回归系统,在将耦合辨识思想与有限数据窗方法结合的基础上,从动态遗忘因子的角度,提出一种改进的子系统变遗忘因子,有限数据窗耦合递推最小二乘辨识算法。文章基于线路两端不同时刻断面的PMU电气量关系建立参数辨识的最小二乘模型;所述方法通过子系统新息的比较判断当前系统运行的稳定程度,进而动态调整遗忘因子,使算法对时变参数的快速跟踪性能和时不变参数的收敛稳定性能进一步增强;当系统突变时,采取重定义协方差阵和变遗忘因子变数据窗相结合的方式,减小了突变扰动对辨识的影响。算法保留了耦合递推和有限数据窗理论的优点,仿真和实测数据辨识验证了算法的有效性和实用性。The accuracy of transmission line parameters has a continuous influence on the improvement of line operation safety and economy.Based on the current situation of widespread application of PMU,aiming at transmission line multi-variable linear regression system,the coupling identification method is combined with finite data window method,and from the angle of dynamic forgetting factor,an improved recursive least squares identification algorithm with variable forgetting factor and finite data window coupling is proposed.In this paper,the least square model of parameter identification is established based on the electric quantity relation of PMU with different section at two ends of transmission line,and the stability of current system operation is judged by comparing the innovation of subsystems,furthermore,the forgetting factor is dynamically adjusted to enhance the fast tracking performance of time-varying parameters and the convergence and stability performance of time-invariant parameters,by combining the redefinition of covariance matrix with the variable data window of the variable forgetting factor,the influence of the sudden change disturbance on the identification is reduced.The algorithm retains the advantages of coupled recursion and finite data window theory,and the validity and practicability of the algorithm are verified by simulation and real data identification.

关 键 词：输电线路 参数辨识 多变量系统 最小二乘 相量测量单元数据 

分 类 号：TM744[电气工程—电力系统及自动化]