CN2932398Y - Multichannel harmonic monitoring and analyzing device - Google Patents
Multichannel harmonic monitoring and analyzing device Download PDFInfo
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- CN2932398Y CN2932398Y CN 200620051808 CN200620051808U CN2932398Y CN 2932398 Y CN2932398 Y CN 2932398Y CN 200620051808 CN200620051808 CN 200620051808 CN 200620051808 U CN200620051808 U CN 200620051808U CN 2932398 Y CN2932398 Y CN 2932398Y
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Abstract
The utility model discloses a multichannel harmonic monitoring and analysis device, comprising a voltage transducer, a current transducer, an Analog to Digital converter, an i<p>, i<q> solver, a self-adapting forecasting filter, a subtracter, and a display. The input ports of the voltage transducer and the current transducer are connected with the alternating current electric power network, and the outputs of the voltage transducer and the current transducer are connected with the input port of the Analog to Digital converter. One output of the Analog to Digital converter is connected with the input port of the i<p>, i<q> solver, and the output of the i<p>, i<q> solver is carried to the input port of the self-adapting forecasting filter whose output signal together with another output of the Analog to Digital converter is carried to two input ports of the subtracter, and the output of the subtracter is connected with the display. The utility model is high in forecasting precision, fast in convergence rate, and effective to reduce the time-delay existed in the digital harmonic checkout system, thereby overcoming the influence of the system time-delay on the harmonic checkout precision.
Description
Technical field
The utility model relates to a kind of harmonic monitoring and analytical equipment, particularly a kind of multi-channel harmonic detection and analytical equipment.
Background technology
Along with the widespread use of power electronic equipment in industry, the pollution of harmonic wave is on the rise.Harmonic wave not only influences the operate as normal of electric equipment, and also the work to communication facilities causes very big influence.It is a key link of power network harmonic wave management process that harmonic wave detects.Calculate the time-delay meeting accuracy that harmonic wave detects is caused very big influence.Existing the time-delay of two aspects in the digitizing harmonic wave detection system, is that the signal of digital controller all can cause the hysteresis that detects the harmonic current phase place on the one hand in the signal Processing of each link; On the other hand, the characteristics of Digital Control are that steering order was upgraded once every certain cycle, the update cycle of steering order is more than or equal to the sampling period of system, changed the moment of steering order from current period, before next cycle change steering order, the control signal of system remains unchanged, and is not to follow the variation of controlling object in real time and change, and this is the prior reason that causes the digital controller departure.Theoretical research shows that under same time-delay, overtone order is high more, and the compensate for residual degree is big more; For certain subharmonic, it is big more to delay time, and the compensate for residual degree is big more.The time-delay that how to reduce digital controller in the harmonic wave testing process is a key link of current power network harmonic wave management process.
The utility model content
For solving the problems of the technologies described above, the utility model provides a kind of multi-channel harmonic detection and analytical equipment.This multi-channel harmonic detection and analytical equipment, with harmonic wave detect, analyze, and failure wave-recording be integrated in one, realize that the harmonic wave of many circuits of a microcomputer monitoring also carries out failure wave-recording, have inexpensive, practical characteristics.
The technical scheme that its technical matters that solves the utility model adopts is: comprise voltage transmitter, current transducer, A/D converter, i
p, i
qAlgorithm device, adaptive prediction filter, subtracter, display, the input end of described voltage transmitter, current transducer links to each other with AC network, the output of voltage transmitter, current transducer connects the input end of A/D converter, and one tunnel output of A/D converter meets i
p, i
qThe input end of algorithm device, i
p, i
qThe input end of adaptive prediction filter is delivered in the output of algorithm device, and the output signal of adaptive prediction filter is exported two input ends delivering to subtracter with another road of A/D converter, and the output of subtracter connects display.
In the above-mentioned multi-channel harmonic detection and analytical equipment, also comprise fault oscillograph, fault oscillograph connects the output of A/D converter.
The beneficial effects of the utility model are: 1) the electric current and voltage transmitter of employing high frequency response has guaranteed the scope of harmonic measure.2) multi-channel a/d converter can carry out high speed, high-precision data acquisition, has improved the precision of harmonic measure.3) i
p, i
qBeing used in combination of algorithm device and adaptive prediction filter makes current time only need the detection of grid distortion current, and the predicted value that deducts fundamental current from total electric current is the harmonic current value of current time.Promptly only need the detection of grid distortion current, and need not do any filtering algorithm, thereby significantly reduced the time-delay in the signal processing at current time.4) fault oscillograph provides scientific basis for data query and fault analysis, for the various data informations of having managed operation of power networks are had laid a good foundation.
Following machine is further described the utility model with specific embodiment in conjunction with the accompanying drawings.
Description of drawings
Fig. 1 is a structure principle chart of the present utility model.
Embodiment
Below in conjunction with drawings and Examples the utility model patent is further specified.
Referring to Fig. 1, the utility model comprises voltage transmitter, current transducer, A/D converter, fault oscillograph, i
p, i
qAlgorithm device, adaptive prediction filter, subtracter, display, the input end of described voltage transmitter, current transducer links to each other with AC network, the three phase network voltage and current signal is converted to than weak signal through high frequency response electric current and voltage transmitter, after carrying out the multi-channel parallel data acquisition through multi-channel a/d converter then, convert the digital voltage current signal again to, fault oscillograph recording voltage current signal is delivered in the output one tunnel of A/D converter, and i is delivered on another road
p, i
qThe input end of algorithm device, i
p, i
qAlgorithm device is passed through i according to the preceding current time electrical network distortion current signal of compensation
p, i
qAlgorithm obtains its fundametal compoment; The adaptive prediction filter prediction and calculation goes out next mains by harmonics voltage and current signal constantly, subtracter this prediction is obtained next constantly mains by harmonics voltage and current signal with detected next constantly line voltage current signal subtract each other and obtain next harmonic signal constantly, fault filter can record accident front and back line voltage electric current and harmonic wave forms when electrical network goes wrong simultaneously.
Claims (2)
1, a kind of multi-channel harmonic detection and analytical equipment comprise voltage transmitter, current transducer, A/D converter, i
p, i
qAlgorithm device, adaptive prediction filter, subtracter, display, it is characterized in that: the input end of described voltage transmitter, current transducer links to each other with AC network, the output of voltage transmitter, current transducer connects the input end of A/D converter, and one tunnel output of A/D converter meets i
p, i
qThe input end of algorithm device, i
p, i
qThe input end of adaptive prediction filter is delivered in the output of algorithm device, and the output signal of adaptive prediction filter is exported two input ends delivering to subtracter with another road of A/D converter, and the output of subtracter connects display.
2, multi-channel harmonic detection according to claim 1 and analytical equipment is characterized in that: comprise that also fault oscillograph, fault oscillograph connect the output of A/D converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620051808 CN2932398Y (en) | 2006-07-31 | 2006-07-31 | Multichannel harmonic monitoring and analyzing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620051808 CN2932398Y (en) | 2006-07-31 | 2006-07-31 | Multichannel harmonic monitoring and analyzing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2932398Y true CN2932398Y (en) | 2007-08-08 |
Family
ID=38348895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620051808 Expired - Fee Related CN2932398Y (en) | 2006-07-31 | 2006-07-31 | Multichannel harmonic monitoring and analyzing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2932398Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101187682B (en) * | 2007-11-26 | 2010-06-02 | 天津理工大学 | On-line self-adaptive harmonic current detection system |
| CN101672873B (en) * | 2009-10-20 | 2011-03-02 | 哈尔滨工业大学 | Detection method of transient harmonic signals of power system based on combination of Tsallis wavelet singular entropy and FFT computation |
| CN111381137A (en) * | 2020-03-11 | 2020-07-07 | 威睿电动汽车技术(宁波)有限公司 | Insulation detection circuit and vehicle |
-
2006
- 2006-07-31 CN CN 200620051808 patent/CN2932398Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101187682B (en) * | 2007-11-26 | 2010-06-02 | 天津理工大学 | On-line self-adaptive harmonic current detection system |
| CN101672873B (en) * | 2009-10-20 | 2011-03-02 | 哈尔滨工业大学 | Detection method of transient harmonic signals of power system based on combination of Tsallis wavelet singular entropy and FFT computation |
| CN111381137A (en) * | 2020-03-11 | 2020-07-07 | 威睿电动汽车技术(宁波)有限公司 | Insulation detection circuit and vehicle |
| CN111381137B (en) * | 2020-03-11 | 2022-04-19 | 威睿电动汽车技术(宁波)有限公司 | Insulation detection circuit and vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |