Phase Difference Algorithm and its FFT Implementation for High-Accuracy Power System Frequency Monitoring

To track the frequency of power system signals under noisy and harmonic circumstances quickly and precisely, a reliable phase difference algorithm based on discrete Fourier transform and its key module implementation are introduced in this paper. By utilizing main spectral line phase difference of two adjacent data windows, the frequency can estimate easily. The introduced algorithm is suitable for FPGA implementation, and the simulation result shows that it has high-accuracy.