自适应形态学滤波器在HAPF中的应用研究

摘要

To improve the performance of HAPF, it is very important to detect the harmonic currents fast and accurately.Based on the comparison of various methods of harmonic detection, this paper puts forward an adaptive morphological filter based on instantaneous reactive power theory, which uses adaptive morphological filter instead of LPF based on the traditional αβ and dq transformation.The new method uses adaptive algorithm to adjust the size of structure element of morphological filter dynamically.It not only preserves the merits of instantaneous reactive power theory, but also has advantages of easy and fast morphology operation and accurate adaptive algorithm.Matlab/Simulink is employed for the simulation study of this method.The results of simulation prove that the method is rapid, accurate and practical.%采用快速、准确的谐波检测方法可显著提高电力混合有源滤波器(Hybrid Active Power Filter,HAPF)的运行性能.在比较多种谐波检测方法后,提出了基于瞬时无功功率理论的自适应形态学滤波器,即在传统的αβ变换、dq变换基础上采用自适应形态学滤波器替代LPF.该方法运用自适应算法动态调整形态滤波器的结构元素尺寸,使其不仅保留了瞬时无功功率理论的优点,并同时具有形态学运算简单快速及自适应算法精确的特点.采用Matlab/Simulink软件进行仿真,结果证明该方法具有快速性和精确性,有较好的实用性.