Multi-loop high-speed switching sampling method and device for power system

The invention discloses an electric power system multi-loop high-speed switching sampling method and an electric power monitoring device, and relates to the field of electric power system sampling and monitoring, and the method comprises the following steps: carrying out the phase-locked frequency multiplication of a fundamental wave signal according to the number of loops to be monitored and the number of sampling points of a fundamental wave period, and obtaining a sampling frequency signal; controlling the multi-path change-over switch to switch and gate one to-be-tested loop to be input into the AD sampling chip for sampling; meanwhile, at the middle moment of two times of switching, AD sampling data are latched; the core processor reads the cache, calculates an independent electric quantity parameter of each loop, corrects a sampling introduction phase angle error of each loop, and calculates a comprehensive electric quantity parameter of all loops; according to the invention, high-speed switching sampli