Low voltage ride through voltage detection method and system based on voice endpoint detection algorithm

The invention belongs to the technical field of low voltage ride through, and particularly relates to a low voltage ride through voltage detection method and system based on a voice endpoint detection algorithm, and the method comprises the steps: obtaining power grid voltage signals at at least two different moments; framing sampling processing is carried out on the obtained power grid voltage, an autocorrelation function corresponding to the power grid voltage signal is constructed, and an autocorrelation function sequence of each frame of power grid voltage signal is obtained; constructing an autocorrelation sequence vector of the power grid voltage signal according to the obtained autocorrelation function sequence of each frame of the power grid voltage signal; calculating an included angle of the autocorrelation sequence vectors of different power grid voltage signals; and completing voltage detection according to the cosine of the included angle, a voltage jump criterion and a preset voice endpoint dete