Second-order generalized integrator-based single-phase phase-locked loop control method

The embodiment of the invention discloses a second-order generalized integrator-based single-phase phase-locked loop control method. The method includes: inputting a power grid voltage signal at an input end of a second-order generalized integrator, and acquiring orthogonal components, which correspond to the power grid voltage signal, according to a stationary coordinate system constructed on thebasis of the second-order generalized integrator; converting the orthogonal components, which are output by the generalized second-order integrator, into rotational components in a rotating coordinate system, carrying out single-phase phase-locked loop control according to the rotational components in the rotating coordinate system, obtaining a phase angle after phase locking, and determining a phase-locked voltage signal according to the phase angle; and carrying out zero-crossing detection on the phase-locked voltage signal, and obtaining a sinusoidal signal according to a preset conversionstrategy after a zero-cro