摘要
针对多频周期信号推导出一组频率估计公式,并给出了一种电网谐波分析的频率估计与跟踪方法。频率估计公式包括采样序列DFT、相位差计算和频率计算。频率跟踪就是依据前一次频率估计修改下一次采样的采样间隔,从而使同步偏差越来越小。对于电力信号,这种方法能完成实时、高精度的谐波分析,而且计算量非常小。Matlab仿真证实了方法的有效性。
In this paper, a set of formulas for frequency estimation of multiple frequency signal is deduced and a method of frequency estimation and tracking for harmonics analysis of power systems is developed. The set of formulas consists of DFT of sampied data, phase difference calculation and frequency calculation. Frequency tracking means that sampling intervals of following sampling is updated according to new frequency estimation, so the synchronous sampling error will be reduced step by step. The method can provide very high accurate for real time harmonics analysis of power signal and it＇s computation is very simply. Matlab simulations show efficiency of the method.
出处
《电测与仪表》
北大核心
2005年第9期9-12,共4页
Electrical Measurement & Instrumentation
关键词
谐波分析
DFF
同步采样
频率估计
频率跟踪
harmonics analysis
synchronous sampling
frequency estimation
frequencytracking
