一种改进的基于自适应陷波器的频率检测方法

An improved ANF-based frequency detection method

变频航空电源系统中，基波频率变化范围为360～800Hz，其频率检测方法需要具有自适应性以跟踪变化的基波频率。基于自适应陷波器（ANF）的频率检测方法能够在变化范围较大的环境下提取出基波频率，但是其结构较复杂。特别是存在谐波时。大大增加了ANF中的子陷波器个数。研究了现有的基于ANF的频率检测方法。针对频率检测模块的动态响应微分方程提出一种改进方法，该改进方法可以在保证动态响应性能的前提下，有效地简化系统结构。实验结果证明了该方法的有效性。

The fundamental frequency of aircraft power system varies from 360 Hz to 800 Hz. The frequency detection method for this application needs to keep track of variable fundamental frequency. Although the frequency detection method based on adaptive notch filter （ANF） can extract the frequency properly, and its structure is complex. Especially the presence of harmonics greatly increases the number of sub-filter. The frequency detection method based on ANF was analyzed first in this paper. Then an improved method based on ANF was proposed to overcome this problem which could simple the system structure effectively. The experimental results verify the proposed improved method.