基于内模原理的自适应电流检测系统研究  

An Improved Adaptive Current Detection System Based on Internal Model Theory

作　　者：童力[1] 邹旭东[1] 张允 康勇[1] 

机构地区：[1]华中科技大学强电磁工程与新技术国家重点实验室,武汉430074 [2]湖南电力试验研究院,长沙410007

出　　处：《电工技术学报》2011年第9期208-216,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金重点项目(50837003);国家973计划(2009CB219701)资助项目

摘　　要：传统自适应电流检测方法因受到低信噪比检测环境引起的"交互式误差干扰"的严重影响,难以兼顾检测方法的快速性和精确性。本文提出了一种新颖的自适应电流检测方法,引入滑动积分滤波器(SIF)消除谐波电流的干扰,并获取基波有功、无功电流幅值估算误差。基于内模控制原理构成有功、无功电流的自适应检测闭环系统,快速、准确地分离提取畸变负载电流中的目标电流分量。文中对所提出的自适应电流检测方法建立了数学模型,并基于控制理论中的方法对本文电流检测方法的收敛性及其快速性、精确性进行了理论分析,为自适应电流检测方法的性能设计提供了理论指导。最后,通过仿真和实验证明本文所提出理论和方法的正确性与有效性。Conventional adaptive current detection methods are always terribly disturbed by the ＂mutual erroneous impacts＂,which are due to the low SNR（signal-to-noise ratio） utility conditions,so it is difficult to make an optimal tradeoff between the speed and accuracy of those adaptive methods.This paper proposes a novel adaptive current detection method,where a sliding integration filter（SIF） is applied to eliminate the disturbances from harmonic current components and to derive the real amplitude estimation errors of fundamental active and reactive current components.Then,adaptive detection closed-loop systems are constructed based on the internal model theory so as to extract the target current components from the distorted load current rapidly and accurately.The mathematical model of the proposed adaptive method is presented,and its performances such as convergence,dynamic and steady-state responses are also illustrated by analytic methods of control theory so that theoretical instructions could be provided for designing the adaptive current detection method.Finally,simulation and experimental results of this novel detection method and previous methods are compared,which verify the correctness and effectiveness of the proposed theory and method.

关 键 词：自适应电流检测 交互式误差干扰 滑动积分滤波器 内模控制原理 

分 类 号：TM712[电气工程—电力系统及自动化]