Power grid synchronization method and system based on open loop, and medium

The invention discloses a power grid synchronization method and system based on an open loop, and a medium. The power grid synchronization method comprises the following steps: calculating output frequency, phase and amplitude parameters required by inverter control; calculating a two-phase input signal under a static coordinate system according to a three-phase input signal, calculating a two-phase input signal under a two-phase rotating coordinate system, obtaining a filtered two-phase input signal through filtering, calculating an input signal under the two-phase static coordinate system, and performing amplitude normalization to obtain a normalized two-phase input signal; and calculating estimated input parameters, and calculating estimated output frequency parameters, output phase parameters and output amplitude parameters according to the estimated input parameters. According to the invention, no stability problem exists, complex parameters do not need to be set, the dynamic response speed is high, no p