Single-phase power grid characteristic extraction method

The invention discloses a method for extracting characteristics of a single-phase power grid, which comprises the following steps of: constructing an orthogonal grid-side voltage signal vector by adopting a generalized second-order integrator method, simultaneously filtering a grid-side voltage signal, and obtaining phase information of grid-side voltage through dq coordinate transformation; uq is obtained through the error of the actual phase value theta * of the grid-side voltage and the phase value theta output by the phase-locked loop, then the error of the Uq and # imgabs0 # is adjusted through PI to obtain the error of the angular frequency, and the error of the angular frequency is added to the angular frequency 2pif of the grid-side voltage to obtain phase information. The method is based on a simple, efficient and rapid grid-side voltage characteristic extraction method, can be applied to the fields of rail transit, wind power generation and the like, and can enhance the adaptability of a grid-side c