Universal DFF-SAI phase locking method under positive sequence rotating coordinate system

A technology of DFF-SAI and rotating coordinate system, which is applied in the direction of reducing the asymmetry of multi-phase network, eliminating/reducing asymmetry of multi-phase network, reducing harmonic/ripple in AC network, etc., which can solve problems such as difficult to achieve results , to achieve the effect of simple results, fast transient response, and small amount of calculation

Active Publication Date: 2022-03-01
YANSHAN UNIV
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Benefits of technology

The technical effect described in this patented technology relates to improving the timing precision (the time required) at an arbitrary point in space without affecting its overall functioning. It involves utilizing both polarity and quadrature signals to create two types of coherence called clockwise and counterclockwave phases, respectively. By combining these techniques together they allow for precise synchronized detection and locked position within specific points in space while maintaining their stability over long periods of operation.

Problems solved by technology

This patented technical problem addressed in this Patents relates to providing better precision timing signals during high-power grid phases without increasing complexity or requiring higher levels of current injection compared to existing techniques like conventional phased-line ring oscillators.

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  • Universal DFF-SAI phase locking method under positive sequence rotating coordinate system
  • Universal DFF-SAI phase locking method under positive sequence rotating coordinate system
  • Universal DFF-SAI phase locking method under positive sequence rotating coordinate system

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Embodiment Construction

[0045] The technical solutions of the present invention will be clearly and completely described below through specific embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0046] Such as figure 1 As shown, the overall structure diagram of the frequency multiplication phase-locking method of the present invention is provided. The main steps are the extraction of the three-phase grid voltage, Clark transformation, T' transformation, DFF-SAI unit, positive and negative sequence separation and extraction links, Park transformation, Phase-locked link. Among them, the phase-locking link obtains the frequency of the double harmonic signal as the frequency information required by the DFF-SAI unit, and th

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Abstract

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.

Description

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Claims

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Application Information

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Owner YANSHAN UNIV
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