一种基于自适应滤波器的改进ip-iq无功电流检测方法

摘要

There is a contradiction between response speed and detection accuracy in the traditional ip-iq reactive current detection method.In view of this,a variable step size least mean square (LMS) adaptive filter is proposed to detect the reactive current other than the traditional low pass filter.Lorentzian function is introduced to the adaptive filter to adjust the step size.First of all,the characteristics of the step adjustment are analyzed.Then,the whole reactive current detection method is analyzed by MATLAB simulation and DSP experiment.The simulation and experimental results show that,compared with the traditional ip-iq method and other kinds of ip-iq methods based on variable step size adaptive filter,the operation speed of the proposed method is the fastest,and this method has the characteristics of fast dynamic response and high precision.%针对传统ip-iq无功电流检测法,存在响应速度和检测精度之间矛盾的问题,采用变步长最小均方(LMS)自适应滤波器取代传统的低通滤波器,进行无功电流的检测.在该自适应滤波器中引入洛伦兹(Lorentzian)函数进行步长的调节,首先对其步长调节特性进行分析,既而对整体无功电流检测方法进行了MATLAB仿真与DSP实测实验分析,实验结果表明,所采用方法相对于传统ip-iq法、以及基于其他变步长自适应滤波器的方法,运算速度快,对于无功电流的检测,动态响应速度快,检测精度高.