Fig. 7From: A new measurement algorithm for PMU in power system based on all-phase Fourier transformTest signal x(t) and the apFFT spectrum. The double-window apFFT experiment of test signal in Eq. (12) is given, which is used to confirm the performance of algorithm under harmonics condition. The first part of the figure is the time waveform of x(t). The apFFT amplitude and phase spectrum are given respectively by the second and third part of the figureBack to article page