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A Second Harmonic Grid Synchronous Frequency Locked Loop Method

A sub-harmonic, frequency-locked loop technology, applied in the field of the second harmonic type power grid synchronous frequency-locked loop, can solve the limitations of frequency-locked loop and phase-locked loop, etc., to achieve good dynamic performance, fewer intermediate links, fast Accurately obtained effect

Active Publication Date: 2022-04-15
YANSHAN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a 2nd harmonic grid synchronous frequency-locked loop method to solve the limitations of existing frequency-locked loops and phase-locked loops

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  • A Second Harmonic Grid Synchronous Frequency Locked Loop Method
  • A Second Harmonic Grid Synchronous Frequency Locked Loop Method
  • A Second Harmonic Grid Synchronous Frequency Locked Loop Method

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Embodiment Construction

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0035] The purpose of the present invention is to provide a 2nd harmonic type power grid synchronous frequency locked loop method, which can simultaneously obtain the positive sequence fundamental wave voltage phase, positive sequence voltage amplitude and frequency of the power grid.

[0036] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below ...

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Abstract

The invention relates to a method for synchronous frequency-locked loop of a 2nd harmonic power grid. The method includes: the three-phase grid signal passes through T nd Transform to obtain the second harmonic d and q axis components; the d axis component obtains the first and second orthogonal quantities through SOGI-QSG; the second orthogonal quantity determines the second harmonic angular frequency through the frequency-locked loop; the second harmonic angle The frequency determines the corresponding phase angle and the fundamental wave phase angle of the power grid; the fundamental wave phase angle is used as T nd The transformation angle of the matrix; the transformation angle corresponding to the phase angle of the second harmonic frequency performs park transformation on the first and second quadrature quantities to determine the positive sequence component amplitude of the input voltage signal. The 2nd harmonic acquisition method of the proposed method is different from the traditional Fourier decomposition, but adopts the constructed T nd The second harmonic signal is acquired through transformation; the present invention realizes accurate tracking of the fundamental wave power grid signal through frequency locking of the second harmonic frequency, and has universality in ideal power grids and non-ideal power grids.

Description

technical field [0001] The invention relates to the field of power grid synchronous tracking, in particular to a second harmonic type power grid synchronous frequency-locked loop method. Background technique [0002] Grid synchronization technology is a technology that detects the amplitude, phase angle, frequency, etc. of the input grid signal. Grid synchronization technology will be used in any power conversion device connected to the grid. Traditional power grid synchronization technologies include zero-crossing detection technology, discrete Fourier transform technology and its improved technology, methods based on neural networks, recursive weighted least squares estimation algorithm, phase-locked loop-free method based on adaptive notch filter, Karl Mann filtering technology, phase-locked loop technology and frequency-locked loop technology. [0003] At present, the most widely used phase-locked loop technology is the synchronous rotating frame phase locked loop (SRF-...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16G01R29/18
CPCG01R23/16G01R29/18
Inventor 闫朝阳段浩天顾和荣胡齐贤赵丁选张祝新刘涛
Owner YANSHAN UNIV
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