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Synchronizing signal detection method based on second-order low-pass wave trap

A second-order low-pass, detection method technology, applied in the direction of instruments, measuring electricity, measuring devices, etc., can solve problems such as affecting the dynamic response and reduction of detection, achieve satisfactory detection accuracy and dynamic response, and meet detection requirements, structure and parameters. Design simplified effects

Inactive Publication Date: 2016-08-24
CHINA UNIV OF MINING & TECH
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Problems solved by technology

Its essence is a phase closed-loop system. Under ideal grid conditions, this method can accurately detect synchronization signals, but under non-ideal conditions, it is necessary to reduce the filter bandwidth to suppress interference caused by grid distortion, which affects the dynamics of detection. response

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  • Synchronizing signal detection method based on second-order low-pass wave trap
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  • Synchronizing signal detection method based on second-order low-pass wave trap

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[0024] The present invention will be further described below in conjunction with the drawings and embodiments:

[0025] 1. Basic principles

[0026] Sync signal detection method based on second-order low-pass notch filter. One is to use a second-order filter and notch filter to increase the attenuation speed of noise, thereby greatly increasing the system cut-off frequency, reducing the detection phase shift and improving the system dynamic response speed. The second is to dynamically adjust the reference frequency and filter parameters through SOGI-PLL, so as to meet the detection requirements for large-scale changes in the grid frequency. Compared with the existing single-phase synchronization signal detection technology, the new method greatly simplifies the structure and parameter design. Theories and experiments show that the synchronization signal detection method of the present invention has satisfactory detection accuracy and dynamic response under various working conditio...

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Abstract

The present invention discloses a synchronizing signal detection method based on a second-order low-pass wave trap. The advantages of the present invention are that: 1 the noise attenuation speed is increased based on a second-order filter and the wave trap, thereby greatly improving a system cut-off frequency, reducing a detection phase shift and improving a system dynamic response speed; 2 a reference frequency and a filter parameter are adjusted dynamically by SOGI-PLL, thereby satisfying the detection requirement for the power grid frequency large-range change. Compared with a conventional single-phase synchronizing signal detection technology, the structure and the parameter design of the new method are simplified substantially, and the theory and experiment show that the synchronizing signal detection method of the present invention has the satisfied detection accuracy and dynamic response on various power grid working conditions.

Description

Technical field [0001] The invention relates to a synchronization signal detection method, in particular to a synchronization signal detection method based on a second-order low-pass trap. Background technique [0002] In recent years, the development of new energy represented by photovoltaic and wind energy has made the application of grid-connected inverters more and more widespread. How to obtain the grid synchronization signal accurately and quickly is essential for the grid-connected inverter to achieve high power, high quality and stable grid connection. The severe working conditions of the power grid mainly include sudden changes in voltage amplitude, sudden changes in phase, sudden changes in frequency and harmonics. At present, the algorithms for obtaining grid synchronization signals mainly include two categories: open loop and closed loop. The open-loop synchronization detection algorithm used more is the synchronization signal detection technology based on stationar...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 袁小平陆鹏飞崔胜春金鹏李子旋蒋硕
Owner CHINA UNIV OF MINING & TECH
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