应用数字信号处理器的基波相位和频率校正检测方法

Fundamental Frequency and Phase Correcting Detection Method Applying Digital Signal Processor

提出了一种基于数字信号处理器的基波相位和频率校正检测方法,可用于电力系统中电压或电流基波分量同步信号的获取。输入信号经模/数(A/D)转换后通过频率校正环节可得到与输入信号基波分量相同角频率的信号,该信号再经初相校正环节后就可得到与输入信号基波分量同频率同初相的相位信号,从而实现对输入信号中基波分量的跟踪。该方法在一个采样周期内分别计算输入信号中基波分量的频率和相位及它们与标准信号的误差,而不需要闭环反馈,显著提高了跟踪速度,由于频率校正环节和相位校正环节的结构相同,又简化了编程。仿真和实验结果表明该检测方法不受谐波影响,跟踪精度较高,暂态响应时间小于20ms。

A novel fundamental frequency and initial phase detection method based on DSP is proposed,which can be used to get synchronous fundamental frequency voltage or current signals of power system.After A/D transform and passing through the frequency correction link,the signal possesses same angular frequency as the input signal’s fundamental component is obtained,after the corrected signal passed through the initial phase correction link again,the phase signal becomes such a signal,which possesses both same fre...