A Vector Decomposion FFT Algorithm to Improve Power Network Frequency

摘要

The measurement of power network running frequency is an important part of power quality test. For a variety of disturbances, anti-interfering and accuracy are required for the algorithm for frequency detecting. Benefited from FFT and efficient DSP chips, the Fourier transform algorithm can be used for reliable and efficient analysis of power network frequency. However, the spectrum leakage of FFT causes impact on the frequency detection accuracy, and the DSP's processing capacity is also limited. Therefore, vector decomposition window-added FFT algorithm based on fixed sampling rate and FFT points is discussed in this paper to handle the problem of impact caused by frequency leakage and to improve frequency detection accuracy. Good results can be achieved by using this algorithm as shown in the experiment.