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Electric network harmonic on-line supervisory circuit based on virtual instrument and working method thereof

A technology of virtual instrument and monitoring circuit, applied in the field of on-line monitoring circuit of power grid harmonics based on virtual instrument, can solve the problems of immature power system application, and achieve the improvement of test efficiency, fast data collection speed, saving time and manpower. Effect

Inactive Publication Date: 2009-03-25
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, virtual instrument technology has many successful application cases in military, aviation and other fields, but its application in power system is not yet mature.

Method used

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  • Electric network harmonic on-line supervisory circuit based on virtual instrument and working method thereof
  • Electric network harmonic on-line supervisory circuit based on virtual instrument and working method thereof
  • Electric network harmonic on-line supervisory circuit based on virtual instrument and working method thereof

Examples

Experimental program
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Effect test

Embodiment

[0026] Embodiment: a kind of grid harmonic online monitoring circuit based on virtual instrument (see attached figure 1 ), is characterized in that it is made up of signal conditioning part, data acquisition card and the computer that contains virtual instrument; Wherein, signal conditioning part input terminal is connected with measured signal, and signal conditioning part output end links to each other with the input end of data acquisition card; Data The output end of the acquisition card is connected with the computer containing the virtual instrument.

[0027] The signal conditioning part mentioned above (see attached figure 1 , 2 ) is composed of a sensor and a signal correction circuit; said sensor includes a voltage sensor and a current sensor, wherein the voltage sensor changes the voltage with a rated value of 100V on the circuit into a voltage within 10V; the current sensor changes the rated value of the system to 5A The current becomes a voltage signal within 1...

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Abstract

The invention provides a power grid harmonics online monitoring circuit based on a virtual instrument. The monitoring circuit is characterized in comprising a signal conditioning part, a data acquisition card and a computer containing a virtual instrument. The working method comprises the steps: (1) signal conditioning stage; (2) data acquisition stage; (3) data analyzing stage; and (4) results displaying stage. The monitoring circuit has the advantage of automatically completing the acquisition of the detected current signal and performing real-time data processing and parameter calculation; the whole testing process can be controlled by the computer, so the testing function of each item to be tested can be changed only by changing the program of the computer and the revision cycle of a testing circuit is shortened; data is acquired rapidly so as to ensure the sampling simultaneity of the tested data; the testing precision is high and the repeatability is good, so that large amount of time and human labor can be saved, the testing efficiency is greatly improved, and the reliability is high; and the user can change or expand the functions of the circuit according to the requirements and the monitoring circuit has stronger and more reliable functions compared with the same type of products.

Description

(1) Technical field: [0001] The invention relates to an on-line monitoring circuit for grid harmonics, in particular to an on-line monitoring circuit for grid harmonics based on a virtual instrument and a working method thereof. (two) background technology: [0002] Safety and high quality are the most basic requirements for the operation of the power system. On the basis of ensuring continuous and reliable power supply, the power system must ensure qualified power quality. However, in recent years, due to the addition of a large number of nonlinear loads, the waveform of the power grid has been distorted and harmonics have been generated; when the harmonic components contained in the power grid reach a certain level, harmonic pollution will be caused, which will seriously damage the power equipment. Therefore, the control of harmonics in the power grid has been highly valued, and the accurate detection of harmonics is a prerequisite for harmonic control. [0003] The tradi...

Claims

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Application Information

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IPC IPC(8): G01R23/16
Inventor 周雪松丰美丽马云斌邵宝福马幼捷张海涛刘增高齐鸣
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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