Wideband Measurement Algorithm for Distribution Network Based on All-Phase FFT

After the high proportion of new energy access, the distribution network signal presents new characteristics of high noise, wide frequency band and obvious dynamic processes, which puts forward higher requirements for broadband measurement algorithm. Therefore, a dynamic broadband measurement algorithm based on all-phase Fourier transform (ApFFT) and improved Taylor Fourier transform (TFT) is proposed. Firstly, ApFFT analysis is applied to the sampled signal, and the phase spectrum is used to judge the existence of dense signals. For the part containing dense signals, the synthesized dynamic phasor is calculated by using the improved TFT with reduced calculation amount. The static and dynamic simulation results show that the algorithm can realize high-precision measurement of broadband signals under high noise.