频谱分析通用程序，输入为时域信号，返回频域信号（幅值与相位）-Spectrum analysis of the general program, the input time-domain signal, to return to the frequency domain signal (magnitude and phase)

This function transforms a three-phase unbalanced phasor into its symmetrical components. The Three phasors can be expressed in a one column array in rectangular complex form or in a two column array in polar form, with 1st column magnit