CN201886082U - Power harmonic monitoring system based on novel Fourier transformation - Google Patents
Power harmonic monitoring system based on novel Fourier transformation Download PDFInfo
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- CN201886082U CN201886082U CN2010206494318U CN201020649431U CN201886082U CN 201886082 U CN201886082 U CN 201886082U CN 2010206494318 U CN2010206494318 U CN 2010206494318U CN 201020649431 U CN201020649431 U CN 201020649431U CN 201886082 U CN201886082 U CN 201886082U
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Abstract
The utility model discloses a power harmonic monitoring system based on novel Fourier transformation, which comprises a voltage transformer, a current transformer, a signal conditioning circuit, an antialiasing filter, an A/D (analog/digital) converter, a controller based on novel Fourier transformation, a memory, an input module, a display, an external communication module and an alarm. The power harmonic monitoring system well solves the problems of spectrum aliasing, low frequency resolution, hurdle effect and spectrum leakage in harmonic analysis by the aid of Fourier transformation, thereby precision of monitoring power harmonics is increased greatly. Real time of monitoring the power harmonics is enhanced by adopting a double-CPU (central processing unit) technique in the controller.
Description
Technical field
The utility model relates to a kind of power harmonic monitoring system, especially relates to a kind of power harmonic monitoring system based on novel Fourier transform.
Background technology
In recent years, along with the widespread use of Power Electronic Technique, Harmonious Waves in Power Systems is polluted serious day by day, has now become the public hazards that influence the quality of power supply.Its main harm is to worsen power quality index, reduces the reliability of electrical network, increases grid loss, shortens the electrical equipment life-span, interfere with communications equipment etc.When the harmonic components that exists in the electrical network has surpassed limitation standard, just will have a strong impact on security, reliability, stability and the economy of electric system and consumer operation, simultaneously also with the electric circumstance around the severe contamination.
In addition, harmonic wave suppresses and compensation system needs to compensate great harmonic wave on earth, need carry out what kind of compensation configuration, and need to reach what kind of compensation effect all be to be foundation with the result that frequency analysis obtains.So the harmonic content in the electric system is monitored in real time, definitely grasp the actual state of harmonic wave in the electric system, to preventing harmonic wave harm, safeguard that the safe operation of electric system is significant.
Based on the power harmonic monitoring system of Fourier transform is a kind of harmonic monitoring system that is most widely used in the current power harmonic monitoring system, has a lot of advantages.But also there is its weak point in this monitoring system, problems such as its weak point is mainly that the current power harmonic monitoring system based on Fourier transform exists when utilizing Fourier transform to carry out frequency analysis that spectral aliasing, frequency discrimination ability are low, fence effect and spectral leakage, will make the signal parameter (frequency, amplitude and phase place etc.) of analysis inaccurate like this, especially phase error is very big, can't satisfy the power harmonic monitoring requirement well.Simultaneously, current power harmonic monitoring system its real-time on real time on-line monitoring is fine not enough.
Summary of the invention
The technical problems to be solved in the utility model provides a kind of power harmonic monitoring system based on novel Fourier transform, it utilizes and in real time harmonic wave is carried out on-line monitoring based on the controller of novel Fourier transform is more accurate by the measurement to voltage and current signal.
In order to solve the existing problem of background technology, the technical solution adopted in the utility model is:
A kind of power harmonic monitoring system based on novel Fourier transform, it is characterized in that: it is made up of voltage transformer (VT), current transformer, signal conditioning circuit, antialiasing filter, A/D converter, controller, storer, load module, display, external communication module and alarm based on novel Fourier transform, and wherein the controller inside based on novel Fourier transform comprises data processing unit and micro-control unit.
The voltage transformer (VT) summation current transformer is connected with signal conditioning circuit, signal conditioning circuit is connected with antialiasing filter, antialiasing filter is connected with A/D converter, A/D converter is connected with controller based on novel Fourier transform, storer is connected with controller based on novel Fourier transform, load module and display are connected with controller based on novel Fourier transform respectively, and external communication module and alarm are connected with controller based on novel Fourier transform respectively.
The beneficial effects of the utility model are: it can solve the current spectral aliasing that exists based on the power harmonic monitoring system of Fourier transform well (1) when utilizing Fourier transform to carry out frequency analysis, the frequency discrimination ability is low, the problem of fence effect and spectral leakage, it has overcome spectral aliasing problem by add antialiasing filter before A/D converter, improved frequency resolution by in based on the design of novel Fourier transform controller, increasing the sampling time, by adding the rectangle self-convolution window and corresponding method of interpolation has reduced the spectral leakage error, reduce fence effect by interpolation algorithm, thereby improved the precision of power harmonic monitoring greatly.(2) consider real time on-line monitoring, two CPU technology in controller, have been adopted based on novel Fourier transform, avoid the OL problem of single CPU, can handle and microcontroller data individually fast simultaneously, thereby improved the real-time of power harmonic monitoring greatly.
Description of drawings
Fig. 1 is a structural representation of the present utility model
Embodiment
As shown in Figure 1, based on the power harmonic monitoring system of novel Fourier transform, comprise voltage transformer (VT) 1, current transformer 2, signal conditioning circuit 3, antialiasing filter 4, A/D converter 5, controller 6, storer 7, load module 8, display 9, external communication module 10 and alarm 11 based on novel Fourier transform; Voltage transformer (VT) 1 summation current transformer 2 is connected with signal conditioning circuit 3, signal conditioning circuit 3 is connected with antialiasing filter 4, antialiasing filter 4 is connected with A/D converter 5, A/D converter 5 is connected with controller 6 based on novel Fourier transform, storer 7 is connected with controller 6 based on novel Fourier transform, load module 8 and display 9 are connected with controller 6 based on novel Fourier transform respectively, and external communication module 10 and alarm 11 are connected with controller 6 based on novel Fourier transform respectively.
Tested voltage and current signal obtains by voltage transformer (VT) 1 summation current transformer 2 respectively, is to be fit to the weak electric signal that subsequent conditioning circuit uses by voltage transformer (VT) 1 summation current transformer 2 with tested voltage and current conversion of signals; Then this voltage and current signal is delivered to signal conditioning circuit 3 and carry out Signal Regulation, reduce spectral aliasing through antialiasing filter 4 again, then analog signal conversion is become digital signal through A/D converter 5, the controller of sending into again based on novel Fourier transform 6 carries out the harmonic wave processing and analyzes, the display analysis result (comprises the real-time waveform demonstration on the control interface at last, the harmonic synthesis data presentation, the frequency spectrum of voltage harmonic and current harmonics shows, the frequency spectrum of harmonic wave active power and reactive power shows, other parameters of electric power demonstrations and pilot lamp demonstration etc.), when exceeding standard, harmonic content will send alerting signal by alarm 11.
The utility model protection domain relates to all changes form recited above.
Claims (1)
1. based on the power harmonic monitoring system of novel Fourier transform, it is characterized in that it is made up of voltage transformer (VT), current transformer, signal conditioning circuit, antialiasing filter, A/D converter, controller, storer, load module, display, external communication module and alarm based on novel Fourier transform; The voltage transformer (VT) summation current transformer is connected with signal conditioning circuit, signal conditioning circuit is connected with antialiasing filter, antialiasing filter is connected with A/D converter, A/D converter is connected with controller based on novel Fourier transform, storer is connected with controller based on novel Fourier transform, load module and display are connected with controller based on novel Fourier transform respectively, and external communication module and alarm are connected with controller based on novel Fourier transform respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206494318U CN201886082U (en) | 2010-12-09 | 2010-12-09 | Power harmonic monitoring system based on novel Fourier transformation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206494318U CN201886082U (en) | 2010-12-09 | 2010-12-09 | Power harmonic monitoring system based on novel Fourier transformation |
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| Publication Number | Publication Date |
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| CN201886082U true CN201886082U (en) | 2011-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206494318U Expired - Fee Related CN201886082U (en) | 2010-12-09 | 2010-12-09 | Power harmonic monitoring system based on novel Fourier transformation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866295A (en) * | 2011-07-06 | 2013-01-09 | 无锡物联网产业研究院 | Electrical signal sensing system |
| CN104330626A (en) * | 2014-10-08 | 2015-02-04 | 国家电网公司 | Power grid harmonic wave monitor |
| CN104950159A (en) * | 2015-06-23 | 2015-09-30 | 中山市木易万用仪器仪表有限公司 | Harmonic current tester |
| CN104977454A (en) * | 2015-06-23 | 2015-10-14 | 中山市木易万用仪器仪表有限公司 | Harmonic wave current testing apparatus |
| CN108018414A (en) * | 2016-11-04 | 2018-05-11 | 薛富盛 | Simple stress relieving method and device |
-
2010
- 2010-12-09 CN CN2010206494318U patent/CN201886082U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866295A (en) * | 2011-07-06 | 2013-01-09 | 无锡物联网产业研究院 | Electrical signal sensing system |
| CN104330626A (en) * | 2014-10-08 | 2015-02-04 | 国家电网公司 | Power grid harmonic wave monitor |
| CN104950159A (en) * | 2015-06-23 | 2015-09-30 | 中山市木易万用仪器仪表有限公司 | Harmonic current tester |
| CN104977454A (en) * | 2015-06-23 | 2015-10-14 | 中山市木易万用仪器仪表有限公司 | Harmonic wave current testing apparatus |
| CN108018414A (en) * | 2016-11-04 | 2018-05-11 | 薛富盛 | Simple stress relieving method and device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110629 Termination date: 20131209 |