数字化变电站交流信号的自适应滤波测量法  

Adaptive Filtering Measurement for AC Signal in Digital Substation

作　　者：李惠宇[1] 于盛林[1] 季侃[2] 罗小莉[2] 

机构地区：[1]南京航空航天大学自动化学院,江苏省南京市210016 [2]国网南京自动化研究院/南京南瑞集团公司,江苏省南京市210003

出　　处：《电力系统自动化》2007年第21期49-52,共4页Automation of Electric Power Systems

基　　金：江苏省科技攻关项目(BE2004018)~~

摘　　要：在采用合并单元集中控制多台光电互感器完成采样的应用中,大多采用固定采样频率,直接运用传统的交流测量算法计算超差。文中采用梯度下降法设计了一种自适应滤波交流测量法,采用一组自适应滤波器产生拟合于被测交流信号的信号,完成被测信号的测量和分析。仿真结果表明该方法用于稳态信号测量时,自适应滤波器收敛周期小于6个周期,具有测试精确、综合运算量小等优点,可满足远动和计量测量的精度和实时性要求。文中同时给出了高次和非整次谐波信号分析解决方案,该方法在装置设计中已得到实际使用。The sampling function, concentrated in EOVT/EOCT and controlled by merging unit, usually uses the fixed sample frequency and the traditional AC measurement method that bring an over-error. An adaptive filtering AC measurement method, which uses a set of adaptive filters to measure and analyze the measured signal, is designed by the gradient descent approach. Simulation results demonstrate that the convergence period of the adaptive filter is less than 6 fundamental cycles in the steady AC signal measurement. This method has the advantages of high accuracy and less calculating time, and can satisfy the precision and reabtime demand of telecontrol and metering. A solution to analyze high-order and non-integer order of harmonics is also given. This method proposed has already been used in a designed IED.

关 键 词：数字化变电站 光电互感器 同步采样 自适应滤波 梯度下降法 

分 类 号：TM764[电气工程—电力系统及自动化]