Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Broadband harmonic collection and measurement system based on multi-band double-way filtering and broadband harmonic collection and measurement method based on the same

A harmonic acquisition and measurement system technology, applied in the field of power system, can solve the problems of not meeting the harmonic monitoring requirements of the power grid, affecting measurement accuracy, and difficult harmonic measurement, so as to improve power supply quality, improve computing efficiency, and provide data support Effect

Active Publication Date: 2013-04-10
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
View PDF3 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the characteristics of nonlinearity, randomness, distribution, non-stationarity and negative influence factors of harmonics, it is very difficult to measure harmonics accurately
At present, the measurable frequency range of various harmonic measuring devices is generally lower than 2.5kHz. Most harmonic meters and power quality monitoring devices can only measure harmonics within the 50th power frequency, which cannot meet the harmonics of modern power grids. monitoring needs
When performing broadband harmonic measurement, it is necessary to add a bandpass filter to the input signal. Since the frequency bandwidth covered by the harmonic is very wide (from the fundamental frequency to 9kHz), the passband range of the filter is subject to the active The bandwidth of the device is limited. If the passband is too wide, the measurement signal will have a large error, which will seriously affect the measurement accuracy.
Therefore, harmonic measurement in high frequency and wide frequency range remains a challenge

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
  • Broadband harmonic collection and measurement system based on multi-band double-way filtering and broadband harmonic collection and measurement method based on the same
  • Broadband harmonic collection and measurement system based on multi-band double-way filtering and broadband harmonic collection and measurement method based on the same
  • Broadband harmonic collection and measurement system based on multi-band double-way filtering and broadband harmonic collection and measurement method based on the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0041] The present invention provides a wide-band harmonic digital signal acquisition system based on frequency-divided dual-channel filtering, the system comprising:

[0042] The isolation module is used to isolate the signal under test;

[0043] A filtering module, configured to perform dual-channel filtering on the isolated measured signal, and obtain corresponding low-frequency components and high-frequency components, the dual-channels include low-frequency and high-frequency two-way filtering channels; and

[0044] The AD sampling module is used to sample the low-frequency component and high-frequency component of the signal under test.

[0045] The filter module includes a low-frequency filter module and a high-frequency filter module, and the AD sampling module includes two AD chips, and the AD chips are integrated on the acquisition board.

[0046]...

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 provides a broadband harmonic collection and measurement system based on multi-band double-way filtering and a broadband harmonic collection and measurement method based on the multi-band double-way filtering. According to the problems that an ordinary harmonic measurement instrument is narrow in measurement band, big in measurement error and the same, a double-way multi-band filtering circuit and a double alterative current / direct current (AD) panel high-frequency sampling circuit. According to the low-band harmonic and high-band harmonic, different filtering circuits and sampling frequencies are selected for signal sampling. The broadband harmonic collection and measurement method is capable of measuring wider-band harmonic, is capable of guaranteeing the measurement accuracy and improving the calculation efficiency by selecting different sampling frequencies according to different applicable bands, and provides an effective method for achieving a high-performance harmonic measurement device.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a wide-band harmonic acquisition and measurement system and method based on frequency-divided dual-path filtering. Background technique [0002] With the continuous advancement of the global industrialization process, the application of power electronic devices is becoming more and more extensive, and the harmonic pollution in the power grid is also becoming more and more serious. The appearance of harmonics deteriorates the environment in which electrical equipment is located, causes various failures and accidents of equipment, and also brings harm to surrounding communication systems and equipment outside the public power grid. In addition, harmonics will also generate additional harmonic losses, reduce power generation and transmission efficiency, and may cause local series or parallel resonance, resulting in malfunctions of relay protection and automatic dev...

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
Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/165
Inventor 周胜军王同勋温惠安哲刘剑
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com