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Second harmonic type power grid synchronous frequency-locked loop method

A sub-harmonic, frequency-locked loop technology, applied in the field of the second harmonic power grid synchronous frequency-locked loop, can solve the limitations of the frequency-locked loop and the phase-locked loop, and achieve good dynamic performance, small error, fast and accurate obtained effect

Active Publication Date: 2021-09-28
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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  • Second harmonic type power grid synchronous frequency-locked loop method
  • Second harmonic type power grid synchronous frequency-locked loop method
  • Second harmonic type power 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 second harmonic type power grid synchronous frequency-locked loop method. The method comprises the following steps: performing Tnd conversion on a three-phase power grid signal to obtain second harmonic d-axis and q-axis components; obtaining a first orthogonal quantity and a second orthogonal quantity by the d-axis component through SOGI-QSG; determining a second harmonic angular frequency by the second orthogonal component through a frequency-locked loop; determining a corresponding phase angle and a power grid fundamental wave phase angle according to the second harmonic angular frequency, wherein the fundamental wave phase angle is used as a transformation angle of a Tnd matrix; and performing park conversion on the first orthogonal component and the second orthogonal component by taking a phase angle corresponding to the second harmonic frequency as a conversion angle to determine the positive sequence component amplitude of input voltage signals. The second harmonic acquisition approach of the method is different from traditional Fourier decomposition, and the constructed Tnd transform is adopted to acquire second harmonic signals; according to the method, fundamental wave power grid signals are accurately tracked by locking the second harmonic frequency, and the method has universality in an ideal power grid and a non-ideal power grid.

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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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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