基于递归VMD的有源滤波器谐波检测

针对有源滤波器谐波检测问题,将递归变分模态分解(VMD)应用于有源滤波器中谐波检测部分。对谐波电流进行递归VMD分解,得到一系列带宽受限的固有模态函数(BIMF),不同的BIMF代表了不同的频率分量,即得到基波和各次谐波BIMF分量,从而完成谐波的检测。在分解中,通过限制带宽估计中心频率,重构模态函数。仿真结果表明,基于递归VMD的谐波检测方法,可以准确有效地提取电力系统中的谐波。

Harmonic Detection for Active Filters Based on Recursive VMD

With regards to harmonic detection of the active filter,recursive variational mode decomposition (VMD)was applied to harmonic detection part in the active filter.A series of bandwidth-limited intrinsic mode functions (BIMF)were obtained through recursive VMD of harmonic current, with different BIMF representing different frequency components, that is, BIMF components of fundamental and other harmonics were obtained.Harmonic detection was thus completed.In the course of decomposition,the modal function was reconstructed by limiting the bandwidth and estimating center frequency.Simulation results showed that the harmonic detection method based on recursive VMD could accurately and effectively extract harmonics from the electric power system.