1 results about "Angular frequency" patented technology

The invention relates to the technical field of power grid synchronous tracking, in particular to a universal DFF-SAI phase locking method under a positive sequence rotating coordinate system, and the method comprises the steps: extracting a three-phase voltage; performing Clark transformation and T'transformation on the three-phase voltage to obtain d 'and q' components containing multiple harmonic signals; enabling the d'and q 'components to pass through a DFF-SAI unit to obtain a positive-sequence multiple harmonic signal; performing Park transformation on the positive sequence multiple harmonic signal to obtain a dq axis component under a positive sequence rotating coordinate system; obtaining an angular frequency and a phase angle of the multiple harmonic signal by using the q-axis component through a phase locking link; the angular frequency of the multiple harmonic signal is used as an angular frequency given quantity of the DFF-SAI unit; according to the d-axis component, the frequency of the multiple harmonic signal and the phase angle, information of the amplitude, the frequency and the phase angle of the fundamental positive-sequence component of the power grid is determined; the method realizes accurate locking of multiple harmonic signals and fundamental positive sequence components, and is suitable for both ideal and non-ideal working conditions of a power grid.