Fast and accurate frequency detection method based on SOGI

A frequency detection and accurate technology, applied in the direction of frequency measurement device, frequency to phase shift conversion, etc., can solve the problems of increased calculation amount, increased operation complexity, long time delay, etc., achieve low calculation amount and improve stop band attenuation performance , the effect of short delay

Inactive Publication Date: 2020-11-24
青岛鼎信通讯科技有限公司 +1
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the SOGI phase-locking algorithm also has its disadvantages. When the grid harmonics are high, multiple SOGI modules need to be combined to form the m-SOGI algorithm, which not only increases the amount of calculati

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Fast and accurate frequency detection method based on SOGI
  • Fast and accurate frequency detection method based on SOGI
  • Fast and accurate frequency detection method based on SOGI

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] The core of the present invention is to provide a fast and accurate frequency detection method based on SOGI, which has simple operation, less resource occupation, high detection accuracy, adapts to complex power grids, and meets the detection requirements of power quality analyzers for frequency parameters.

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 making creative efforts belong to the protection scope of the present invention.

[0030] image 3 The flow chart of the SOGI-based fast and accurate frequency detection method provided by the embodiment of the presen...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a fast and accurate frequency detection method based on SOGI, and the method comprises the steps: carrying out the sampling and normalization of a single-phase voltage signal,and carrying out the IIR low-pass filtering of obtained normalized floating point data, so as to eliminate the impact caused by harmonic waves and inter-harmonic waves; and separating in-phase and quadrature components of a filtered signal by using an SOGI module, obtaining active and reactive components according to dq conversion, wherein the reactive component is known to be 0 according to physical significance, correction is carried out according to the physical significance, accurate phase and frequency information is obtained, the obtained frequency is a fluctuation quantity, a stable frequency detection result can be obtained by using a mean filtering algorithm, the filter adopts a lower order, and the coefficient of the filter is obtained by a computer and stored in Flash for calling; and three-stage series connection can be adopted for mean filtering, so that the frequency detection range is expanded.

Description

technical field [0001] The invention belongs to the field of power system power quality of the present invention, and mainly aims at accurately detecting the frequency of the power grid, especially considering the situation of high harmonic components in the voltage of the power grid. Background technique [0002] With the rapid development of power electronics and information technology, the wide application of various nonlinear devices, the expansion of the grid scale and the increase of complexity, harmonic currents will inevitably be generated in the grid. Harmonic voltage is generated by harmonic current and grid impedance, so harmonic voltage is inevitable, and the harmonic voltage generated under weak grid is especially serious. [0003] Grid voltage zero-crossing detection is a frequency locking method adopted by many products. It has the advantages of being fast and simple. However, when the harmonic content of the power grid is high, the superposition of harmonics ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01R23/12
CPCG01R23/12
Inventor 张鹏程郭志强卢松林宁振
Owner 青岛鼎信通讯科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap