市电频率的谱分析测量法

Spectral Analysis Measurement of Urban City Frequency

频率测量在电力工业中极具实用价值.笔者研究表明,利用相继两次DFT分析可以精确得出周期信号(如市电信号)各频率分量的频率、幅度与相位.这一方法的测量精度远优于其它方法,并可适用于一切具有分立谱线的时域变量的测量.

The frequency measurement is of practical value in electric industry. The frequency, amplitude and phase of the periodic signal can be calculated through two successive DFT analyses. This method, with superior measurement precision, is applicable to the measurement of time domain variable with discrete spectral lines.