实时扰动频率控制的自适应陷波器研究

针对工频干扰范围在49Hz~51Hz区间波动时，传统自适应陷波器存在滤除精度不高的问题。本研究采用快速傅立叶变换实时提取工频干扰频率值，并设计补零法在保证精度的前提下提高系统实时性。在FPGA上采用下降沿检测获得快速傅立叶变换结果的极值，通过排序法拟合出干扰频率。设计基于实时扰动频率控制的自适应陷波器，在线改变自适应陷波器的陷波频率，实时补偿干扰频率变化。研究结果表明，实时扰动频率控制的自适应陷波器，能够更好滤除49Hz~51Hz范围工频干扰，提高滤波性能。

Adaptive notch filter with real time disturbance frequency control

In view of the characteristics of power-line interference frequency fluctuation between 49Hz~51Hz and non transient, traditional adaptive notch filter has the problem of low accuracy. In this study, FFT transform method is used to extract the power frequency interference frequency, and zero compensation method is used to improve the real-time performance of system in the premise of ensuring the accuracy. The extreme value of the FFT transform results is obtained by using the falling edge detection on FPGA, Then interference frequency was fitted by ranking method. The design of real time control based on disturbance frequency adaptive notch filter, change adaptive notch filter notch frequency online, real-time compensation of interference frequency change. The results show that real-time adaptive disturbance frequency control of notch filter, Can better remove the 49Hz~51Hz range of power frequency interference, improve the filtering performance.