CN101393240A - Power Grid Harmonic Online Monitoring Circuit and Its Working Method Based on Virtual Instrument - Google Patents
Power Grid Harmonic Online Monitoring Circuit and Its Working Method Based on Virtual Instrument Download PDFInfo
- Publication number
- CN101393240A CN101393240A CNA2008101527986A CN200810152798A CN101393240A CN 101393240 A CN101393240 A CN 101393240A CN A2008101527986 A CNA2008101527986 A CN A2008101527986A CN 200810152798 A CN200810152798 A CN 200810152798A CN 101393240 A CN101393240 A CN 101393240A
- Authority
- CN
- China
- Prior art keywords
- signal
- data acquisition
- voltage
- virtual instrument
- monitoring circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000004364 calculation method Methods 0.000 claims abstract description 6
- 238000007405 data analysis Methods 0.000 claims abstract description 4
- 230000003750 conditioning effect Effects 0.000 claims abstract 10
- 238000004458 analytical method Methods 0.000 claims description 10
- 230000004907 flux Effects 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 abstract description 16
- 238000012545 processing Methods 0.000 abstract description 6
- 238000005070 sampling Methods 0.000 abstract description 2
- 230000006870 function Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000013500 data storage Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000012517 data analytics Methods 0.000 description 1
- 238000013481 data capture Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
Images
Landscapes
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
一种基于虚拟仪器的电网谐波在线监测电路，其特征在于它是由信号调理部分、数据采集卡和含虚拟仪器的计算机组成；工作方法包括：①信号调理阶段；②数据采集阶段；③数据分析阶段；④结果显示阶段；本发明的优越性在于：能自动完成被测电流信号的采集，并且进行实时数据处理及参数计算；整个测试过程可由计算机的程序控制，故只要改变计算机的程序，就可以改变测试的各项目的测试功能，测试电路更新周期短；数据采集速度快，保证被测试数据采样的同时性；测试精度高，重复性好，可节省大量的时间和人力，大大提高了测试效率，并且可靠性高；用户可以根据自己的需要更改或扩充电路的功能，与同类型产品相比功能强大可靠。
An online harmonic monitoring circuit of a power grid based on a virtual instrument is characterized in that it is composed of a signal conditioning part, a data acquisition card and a computer containing a virtual instrument; the working method includes: ① signal conditioning stage; ② data acquisition stage; ③ data Analysis stage; 4. result display stage; the present invention has the advantage that it can automatically complete the collection of the measured current signal, and carry out real-time data processing and parameter calculation; the whole testing process can be controlled by the program of the computer, so as long as the program of the computer is changed, The test function of each test item can be changed, and the update cycle of the test circuit is short; the data acquisition speed is fast, ensuring the simultaneity of the tested data sampling; the test accuracy is high, the repeatability is good, it can save a lot of time and manpower, and greatly improve the Test efficiency and high reliability; users can change or expand the function of the circuit according to their own needs, which is more powerful and reliable than similar products.
Description
(1) technical field:
The present invention relates to a kind of mains by harmonics on-line monitoring circuit, particularly a kind of mains by harmonics on-line monitoring circuit and method of work thereof based on virtual instrument.
(2) background technology:
Safety, high-quality are the most basic requirements to Operation of Electric Systems, on the basis of electric system reliable power supply guaranteeing to continue, must guarantee the qualified quality of power supply.But in recent years,, produced harmonic wave because the adding of a large amount of nonlinear-loads makes the electrical network waveform distort; When harmonic component contained in the electrical network acquires a certain degree, will cause harmonic pollution, power equipment is brought serious harm, influence the normal operation of electric system, therefore, mains by harmonics administered paid much attention to, and the accurate detection of harmonic wave is the condition precedent of carrying out harmonic wave control.
Traditional harmonics detection circuit is core, function singleness with hardware mainly, do not possess data storage and analytic function, harmonic measure for various objectives, usually adopt different Measurement and analysis instrument, testing cost height so not only, and bring a lot of inconvenience for test and analysis.
Virtual instrument technique is the new technology of being born in the U.S. nineties in 20th century, its appearance is described as " revolution of observation and control technology " and " technology of 21 century ", its major technique characteristics are to make various instruments or equipment with software replacement hardware, to finish various measurements and control function, saying of " software being exactly instrument " arranged.Virtual instrument has become a kind of " Microcomputerized Instrument " fully, its hardware components has only a data capture card, realize that measured signal is by the conversion of analog quantity to digital quantity, whole instrument is based upon on the basis of a computing machine fully, other functions of instrument, as data processing, calculating, analysis, storage and Presentation Function etc., become by software fully and finish.At present, virtual instrument technique has had a lot of successful application cases in fields such as military affairs, aviations, but also not overripened in application on power system.
(3) summary of the invention:
The object of the present invention is to provide a kind of mains by harmonics on-line monitoring circuit and method of work thereof based on virtual instrument, this circuit with up-to-date Application of Virtual in the harmonic wave test macro, this test circuit that testing tool is embedded in computing machine can be caught fast measured signal in moment, can the great data processing task of the amount of finishing the work in the extremely short time, go forward side by side line item with show measurement result.
Technical scheme of the present invention: a kind of mains by harmonics on-line monitoring circuit based on virtual instrument is characterized in that it is made up of signal condition part, data collecting card and the computing machine that contains virtual instrument; Wherein, signal condition is partly imported the termination measured signal, and signal condition part output terminal links to each other with the input end of data collecting card; The output terminal of data collecting card links to each other with the computing machine that contains virtual instrument.
Above-mentioned said signal condition part is made up of sensor and peaking circuit; Said sensor comprises voltage sensor and current sensor, and wherein voltage sensor is that the voltage of 100V becomes 10V with interior voltage with the ratings on the circuit; Current sensor is that the electric current of 5A becomes 10V with interior voltage signal with the ratings in the system; Wherein, one the input end B of two peaking circuits that is used for overcoming the transformed error that individual difference brought of sensor connects voltage sensor, and the input end B of another in two peaking circuits connects current sensor; The output terminal C of peaking circuit connects data collecting card; Ratings is the electric current and voltage simulating signal of 100V and 5A in the system, the sensor of the zero magnetic flux by signal condition part, become ± 10V is connected to data collecting card with interior voltage signal.
The Hall type HYH-SB-13-U voltage sensor that the voltage sensor of above-mentioned said signal condition part adopts Wuhan Hua Yi Electronics Co., Ltd. to produce, the Hall type HYH-SB-13-I current sensor that the current sensor of said signal condition part adopts Wuhan Hua Yi Electronics Co., Ltd. to produce;
Above-mentioned said data collecting card adopts the data collecting card of the PCI-6220 model of America NI company; The way of acquired signal is below 16 the tunnel; Picking rate is 250ks/s; Acquisition precision is 16; Analog input channel is 16 the tunnel.
The above-mentioned said computing machine that contains virtual instrument, be various types of computing machines, notebook, laptop computer, industrial computer one of them.
A kind of method of work of above-mentioned mains by harmonics on-line monitoring circuit based on virtual instrument is characterized in that described method of work comprised with the next stage:
(1) the signal condition stage: with the mutual inductor of current analog signal to be measured by zero magnetic flux, become ± 10V sends into data collecting card with interior voltage signal;
(2) data acquisition phase: by wave filter and A/D converter, contained noise signal in the filtered signal, the signal after will purifying then carries out the mutual conversion between digital quantity and the analog quantity;
(3) the data analysis stage: the current signal that collects is handled by analysis, calculated its harmonic content and correlation parameter;
(4) result shows the stage: the result after the analytical calculation is shown on calculating, intuitively show the content of harmonic wave in the electric current.
The mutual inductor of the zero magnetic flux in the above-mentioned said step (1), such mutual inductor can guarantee the accuracy of signals collecting, also can guarantee the bandwidth of signals collecting, its ultimate principle is a Hall magnetic balance principle, is also referred to as " zero magnetic flux " principle.
Principle of work of the present invention is: the G Programming with Pascal Language that the present invention adopts the LabVIEW Software Development Platform to provide, functions such as the data processing of circuit, analysis, calculating, data storage, demonstration and communication all realize by software.The main process module of software is as shown in Figure 3: the virtual instrument program is at first read in digital signal from data collecting card, then the digital signal of gathering is carried out data processing such as digital filtering and windowing, again these signals are carried out fourier-transform and spectrum analysis, analysis result is shown and storage by variety of way.
The software of circuit has two parts, and one is on-line monitoring, and it mainly realizes some top functions, another is a monitoring analysis, it is an off-line analysis program, mainly is by reading the data of circuit on-line monitoring storage, the index of every quality of power supply being analyzed.The data storage of device adopts text formatting, and per minute writes down once, stores a file every day, and a table apparatus can move more than 5 years continuously.
The data of circuit can realize distant place transmission, can select multiple mode arbitrarily according to the network condition of system, if there is LAN (Local Area Network) at the scene, can adopt network interface card to carry out the data sharing mode, obtain field data by distant place computing machine; If telephone wire is arranged, can connect by modem dialup, carry out the data periodic transmission; Adopt the mains by harmonics on-line monitoring circuit of Virtual Instrument Technology, can detect the harmonic content on electrical network or the power equipment line rapidly and accurately, and calculate, analyze, show during at last with fructufy; Therefore, be a important directions in the mains by harmonics on-line monitoring field with Application of Virtual in mains by harmonics on-line monitoring circuit.
The present invention is installed in the master-control room of the transformer station of electric power system usually, harmonic wave in certain specific feed line or large user's the outlet is carried out long-term on-line monitoring, the quality of power supply of bus in can the monitoring station also can be monitored the quality of power supply of certain measurement loop; The data of its continuous monitoring can be handled and store automatically, can also analyze and provide analysis report to the control center in a distant place by Network Transmission; The present invention adopts wide voltage source to power can self-adaptation from 100V to 250V.
Superiority of the present invention is: 1. can finish tested current signals automatically, and carry out real time data processing and calculation of parameter; 2. whole test process can be by the programmed control of computing machine, so as long as change the program of computing machine, just can change the test function of projects of test, the test circuit update cycle is short; 3. acquisition speed is fast, guarantees the simultaneity of tested data sampling; 4. measuring accuracy height, good reproducibility can be saved a large amount of time and manpower, has improved testing efficiency greatly, and the reliability height; 5. the user can compare powerful reliable according to the needs change of oneself or the function of extension circuit with product of the same type.
(4) description of drawings
Accompanying drawing 1 is the system chart of the related a kind of mains by harmonics on-line monitoring circuit based on virtual instrument of the present invention.
Accompanying drawing 2 partly connects block diagram for the signal condition of the related a kind of mains by harmonics on-line monitoring circuit based on virtual instrument of the present invention.
Accompanying drawing 3 is the circuit connection diagram of peaking circuit in the signal condition part of the related a kind of mains by harmonics on-line monitoring circuit based on virtual instrument of the present invention.
Accompanying drawing 4 is the software flow pattern of the related a kind of mains by harmonics on-line monitoring circuit based on virtual instrument of the present invention.
(5) embodiment:
Embodiment: a kind of mains by harmonics on-line monitoring circuit (seeing accompanying drawing 1) based on virtual instrument is characterized in that it is made up of signal condition part, data collecting card and the computing machine that contains virtual instrument; Wherein, signal condition is partly imported the termination measured signal, and signal condition part output terminal links to each other with the input end of data collecting card; The output terminal of data collecting card links to each other with the computing machine that contains virtual instrument.
Above-mentioned said signal condition part (seeing accompanying drawing 1,2) is made up of sensor and peaking circuit; Said sensor comprises voltage sensor and current sensor, and wherein voltage sensor is that the voltage of 100V becomes 10V with interior voltage with the ratings on the circuit; Current sensor is that the electric current of 5A becomes 10V with interior voltage signal with the ratings in the system; Wherein, one the input end B of two peaking circuits that is used for overcoming the transformed error that individual difference brought of sensor connects voltage sensor, and the input end B of another in two peaking circuits connects current sensor; The output terminal C of peaking circuit connects data collecting card; Ratings is the electric current and voltage simulating signal of 100V and 5A in the system, the sensor of the zero magnetic flux by signal condition part, become ± 10V is connected to data collecting card with interior voltage signal.
The Hall type HYH-SB-13-U voltage sensor that the voltage sensor of above-mentioned said signal condition part (seeing accompanying drawing 2) adopts Wuhan Hua Yi Electronics Co., Ltd. to produce, the Hall type HYH-SB-13-I current sensor that the current sensor of said signal condition part adopts Wuhan Hua Yi Electronics Co., Ltd. to produce;
Above-mentioned said data collecting card (seeing accompanying drawing 1) adopts the data collecting card of the PCI-6220 model of America NI company; The way of acquired signal is below 16 the tunnel; Picking rate is 250ks/s; Acquisition precision is 16; Analog input channel is 16 the tunnel.
The above-mentioned said computing machine that contains virtual instrument (seeing accompanying drawing 1), be various types of computing machines, notebook, laptop computer, industrial computer one of them.
A kind of method of work of above-mentioned mains by harmonics on-line monitoring circuit based on virtual instrument is characterized in that described method of work comprised with the next stage:
(1) the signal condition stage: with the mutual inductor of current analog signal to be measured by zero magnetic flux, become ± 10V sends into data collecting card with interior voltage signal;
(2) data acquisition phase: by wave filter and A/D converter, contained noise signal in the filtered signal, the signal after will purifying then carries out the mutual conversion between digital quantity and the analog quantity;
(3) the data analysis stage: the current signal that collects is handled by analysis, calculated its harmonic content and correlation parameter;
(4) result shows the stage: the result after the analytical calculation is shown on calculating, intuitively show the content of harmonic wave in the electric current.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101527986A CN101393240A (en) | 2008-11-03 | 2008-11-03 | Power Grid Harmonic Online Monitoring Circuit and Its Working Method Based on Virtual Instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101527986A CN101393240A (en) | 2008-11-03 | 2008-11-03 | Power Grid Harmonic Online Monitoring Circuit and Its Working Method Based on Virtual Instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101393240A true CN101393240A (en) | 2009-03-25 |
Family
ID=40493631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101527986A Pending CN101393240A (en) | 2008-11-03 | 2008-11-03 | Power Grid Harmonic Online Monitoring Circuit and Its Working Method Based on Virtual Instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101393240A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102087314A (en) * | 2011-01-07 | 2011-06-08 | 北京航空航天大学 | Power grid harmonic analyzer based on virtual instrument |
| CN102645601A (en) * | 2012-05-16 | 2012-08-22 | 浙江大学 | Pantograph-catenary electrical parameters detection and debugging system based on NI USB6251 data acquisition card |
| CN101807795B (en) * | 2010-02-12 | 2012-10-17 | 重庆电力科学试验研究院 | Method and device for constructing electric energy metering simulation system |
| CN103529294A (en) * | 2013-09-26 | 2014-01-22 | 国家电网公司 | HHT (Hilbert-Huang Transform)-based harmonic detection system and method for grid-connected inverter of photovoltaic system |
| CN104360154A (en) * | 2014-11-12 | 2015-02-18 | 天津理工大学 | Instantaneous reactive power harmonic detection system based on self-adaptation low-pass filter |
| CN105971976A (en) * | 2016-05-25 | 2016-09-28 | 广西柳工机械股份有限公司 | Method for measuring hydraulic pressure of engineering machine by means of voltage type pressure sensor |
| CN111982500A (en) * | 2020-08-30 | 2020-11-24 | 东科克诺尔商用车制动技术有限公司 | Data detection and analysis system of power steering gear safety unloading valve |
-
2008
- 2008-11-03 CN CNA2008101527986A patent/CN101393240A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101807795B (en) * | 2010-02-12 | 2012-10-17 | 重庆电力科学试验研究院 | Method and device for constructing electric energy metering simulation system |
| CN102087314A (en) * | 2011-01-07 | 2011-06-08 | 北京航空航天大学 | Power grid harmonic analyzer based on virtual instrument |
| CN102645601A (en) * | 2012-05-16 | 2012-08-22 | 浙江大学 | Pantograph-catenary electrical parameters detection and debugging system based on NI USB6251 data acquisition card |
| CN103529294A (en) * | 2013-09-26 | 2014-01-22 | 国家电网公司 | HHT (Hilbert-Huang Transform)-based harmonic detection system and method for grid-connected inverter of photovoltaic system |
| CN104360154A (en) * | 2014-11-12 | 2015-02-18 | 天津理工大学 | Instantaneous reactive power harmonic detection system based on self-adaptation low-pass filter |
| CN105971976A (en) * | 2016-05-25 | 2016-09-28 | 广西柳工机械股份有限公司 | Method for measuring hydraulic pressure of engineering machine by means of voltage type pressure sensor |
| CN111982500A (en) * | 2020-08-30 | 2020-11-24 | 东科克诺尔商用车制动技术有限公司 | Data detection and analysis system of power steering gear safety unloading valve |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101807795B (en) | Method and device for constructing electric energy metering simulation system | |
| CN101393240A (en) | Power Grid Harmonic Online Monitoring Circuit and Its Working Method Based on Virtual Instrument | |
| CN101436046B (en) | Integrated multichannel synchronous oscillation data acquiring and monitoring and analysis diagnostic device | |
| CN101441231B (en) | Harmonic electric energy metering error analytical apparatus | |
| CN208188313U (en) | A kind of electric energy meter calibrating apparatus with built-in monitoring base table | |
| CN106405294B (en) | Portable power distribution product transmission calibrator and implementation test method thereof | |
| CN104111436A (en) | Automatic detection system and method for digital multimeter | |
| CN203275631U (en) | Intelligent detection system of microcomputer type relay protection tester | |
| CN101221210A (en) | A finished circuit board automatic test and correction system and its automatic test and correction method | |
| CN106526526A (en) | Test device for digital metering system | |
| CN103543329B (en) | A kind of high energy consumption smelting system electric energy loss measuring method | |
| CN101726414A (en) | Method and system thereof for measuring trial run parameter of aeroengine | |
| CN106646333A (en) | Intelligent electric energy meter on-line monitoring and remote control system | |
| CN205038273U (en) | Measurement device for earthing device power frequency and impact characteristic parameter | |
| CN109324225A (en) | A High Precision Current Sampling System for CVT Online Monitoring | |
| CN201014997Y (en) | Excitation system testing device based on virtual instrument | |
| CN201935964U (en) | Automatic intelligent detection device for quartz oscillator instrument | |
| CN205608171U (en) | Digital electric energy measurement system's testing arrangement | |
| CN202453431U (en) | Handheld electric power multifunctional waveform recording analyzer | |
| CN201583642U (en) | Calibration apparatus and system of digital electric energy meter | |
| CN201319049Y (en) | High-tension current mutual-inductor transformation ratio tester | |
| CN105093157B (en) | The method of testing of parameter algorithm based on IEC61850 sampled values | |
| CN102721878A (en) | Intelligentized automatic checkout device of quartz crystal oscillator instrument | |
| CN106546936B (en) | A virtual detection system and detection method for energy efficiency monitoring equipment detection | |
| CN105353331A (en) | Electronic transformer metering performance detection system and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090325 |