基于同步相关滤波的交流励磁发电系统电力谐波检测

Power Harmonic Detection of AC Excited Generation System Based on the In-Phase Correlation Filtering

根据数字信号处理理论 ,导出基于频谱搬移原理的同步相关滤波技术 ,用于基波频率变化、谐波频谱与基波接近且包含低于基频的次谐波成分信号的谐波检测之中。理论分析与实验运行表明 ,这是一种解决交 -交变频器交流励磁发电系统电力谐波检测的有效方法。

On the basis of digital signal processing theory,the in-phase correlation filtering technique,based on the frequency shifting principle,was deduced.The technique can be applied in the harmonic detecting where the fundamental frequency is variable,the harmonic frequencies are closed to the fundamental and the frequency spectrum contains a lot of sub harmonic with the frequencies below the fundamental.Theoretical analysis and experimental operation indicate that this technique is an effective approach to detect the harmonics,generated by the cycloconverter excited a.c.generation system.