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基于自适应陷波器(adaptive notch filter,ANF)的电压同步信号提取方法能够在变频情况下准确提取基波频率和同步信号。但当电压频率在较大范围内变化时,如航空电源频率在360~800 Hz之间变化,会对ANF频率提取的动态性能产生影响。通过对ANF的动态性能进行理论分析和实验测试,发现其动态响应速度与电源频率呈现反比关系:电源频率越高,频率提取的响应速度越低。将频率检测结果引入到ANF的反馈环节中,提出一种改进的基于ANF的同步信号提取方法。该方法可消除电源频率变化对频率提取响应速度的影响,使变频情况下的频率检测结果具有频率响应自适应性。将改进方案在变频航空电源环境中进行仿真和实验研究,结果表明,所提方法能有效消除电源频率变化对动态响应速度的影响,提高动态性能,验证了理论分析的正确性。
The voltage synchronization signal extraction method based on adaptive notch filter (ANF) can accurately extract the fundamental frequency and synchronization signal under the condition of frequency conversion. However, when the voltage frequency changes in a wide range, such as the change of the frequency of the aviation power supply between 360 and 800 Hz, the dynamic performance of the ANF frequency extraction will be affected. Through the theoretical analysis and experimental tests on the dynamic performance of the ANF, it is found that the dynamic response speed is inversely proportional to the power frequency: the higher the power frequency, the lower the response speed of the frequency extraction. The frequency detection results are introduced into the feedback loop of ANF, and an improved ANF-based synchronization signal extraction method is proposed. The method can eliminate the influence of the change of the power frequency on the frequency response speed and make the frequency detection result of the frequency conversion adaptive with the frequency response. The results show that the proposed method can effectively eliminate the influence of power frequency variation on the dynamic response speed and improve the dynamic performance, which verifies the correctness of the theoretical analysis.