基于输入观测器理论的电流谐波检测方法  

A Current Harmonics Detection Method Based on Input Observer Theory

作　　者：李钷[1] 张怡茹 

机构地区：[1]厦门大学航空航天学院,厦门361005

出　　处：《电工技术学报》2016年第7期136-144,共9页Transactions of China Electrotechnical Society

基　　金：中央高校基本科研业务费资助项目(20720150088)

摘　　要：基于输入观测器理论,对电流谐波在线检测问题进行了研究,得到了一种能够快速准确地提取电流信号中各频率分量的方法。首先,将被测电流信号和其各频率的分量作为状态量,构建线性时变的状态空间模型。然后,设计基于状态空间模型的观测器对未知状态变量进行在线观测,从而实现各频率分量的信息提取。所设计的观测器是时变的,其稳定性和收敛性由Lyapunov定理及Lasalle不变集原理所证明。最后,搭建仿真和实验平台对该方法进行验证,结果表明其具备检测速度快、精度高、动态跟踪性能和抗干扰性好等优点。Based on the input observer theory,the online current harmonics detection method is proposed,which can detect all the frequency components within the current signal accurately and rapidly. Firstly,by setting the state variables as the value and each frequency component of the measured current,a linear time-varying state space model is established. Then,based on the proposed model,a time-varying observer is constructed to estimate the unknown states in order to achieve the extraction of each frequency component. The stability and convergence of the observer are proved by the Lyapunov theorem and the Lasalle invariant set principle. Finally,the simulation and experimental results show that the proposed method has advantages in detection speed,accuracy,dynamic tracking performance,and robustness.

关 键 词：谐波检测 输入观测器 状态空间模型 稳定性分析 

分 类 号：TM935[电气工程—电力电子与电力传动]