CN101957396A - On-line monitoring device and method for voltage quality of electric power system - Google Patents
On-line monitoring device and method for voltage quality of electric power system Download PDFInfo
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- CN101957396A CN101957396A CN200910072501XA CN200910072501A CN101957396A CN 101957396 A CN101957396 A CN 101957396A CN 200910072501X A CN200910072501X A CN 200910072501XA CN 200910072501 A CN200910072501 A CN 200910072501A CN 101957396 A CN101957396 A CN 101957396A
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Abstract
The invention relates to on-line monitoring device and method for voltage quality of an electric power system. The voltage quality of various voltage grades from 10kV to 1000kV of the electric power system can be on-line monitored in real time; stable state data of deviation, harmonic waves, voltage fluctuation and flicker, three-phase unbalance, and the like of the voltage is fully monitored; and transient data of transient overvoltage and temporary overvoltage are simultaneously monitored. The on-line monitoring device can acquire voltages in various voltage grades in real time from multiple paths at high speed by adopting a multi-channel high-speed acquiring device, an automatic recording device, a storage device and a display voltage quality monitoring device, and simultaneously record various quality data of 32 voltages. The on-line monitoring device can automatically start the storage and the record of overvoltage temporary waveforms and calculate overvoltage multiple and temporary frequency. The recording time can reach 5s. The device adopts a linux multi-task operating system and the whole software adopts a Web/Brower manner.
Description
Technical field
The present invention relates to a kind of device and method of on-line monitoring power system voltage quality, particularly a kind of hyperchannel, high picking rate, for a long time are applicable to the on-Line Monitor Device and the method for each electric pressure of electric system 10kV～1000kV.
Technical background
In recent years, extra-high voltage direct-current transmission and country widely popularize the construction of clean energy resourcies such as wind-powered electricity generation, the development of electric railway and various heavy industry department have used power electronic equipment and power application rectification and commutation technique in a large number, produce a large amount of harmonic waves and injected electrical network, caused the distortion of power system voltage waveform.A large amount of uses of, impact load non-linear along with these, it is more outstanding that the quality of voltage problem will become, to the influence of operation of power networks, sensitive electrical appliances and harm will be more obvious, be embodied as: exceed standard loss increase, the lost of life, the work that can make consumer of voltage deviation is undesired; The fluctuation of voltage and flickering exceed standard and can endanger the equipment that is connected other users of public supply terminals with it, and the possibility that electric power accident takes place will progressively show as by the defective institute of the quality of power supply and cause.So; prevent the infringement of superpotential to operation power equipment; or infringement reduced to minimum; know for sure and be subjected to much superpotential long-term invasion and attack in the transformer station; whether equipment can bear superpotential is impacted; whether some emphasis equipment needs special protection, and whether systematic parameter cooperates appropriate etc. extremely important.Measure the transient overvoltage waveform; obtain information such as superpotential multiple and frequency; data is clearly arranged, the reason that just can search fault and abnormal accident fast, the failure rate of minimizing electric system to whether effective superpotential situation, protection of arrester level and the residual voltage etc. of operation transformer station etc.
On the other hand, along with numerous precise electronic and power electronic equipments based on computing machine, microprocessor control use in a large number in electric system, the user is more and more higher to the requirement of power supply reliability, and is more and more higher to the sensitivity of quality of voltage.The monitoring grid voltage quality, the variation of analytical voltage quality index at length comprehensively,, the hidden danger that discovery in time jeopardizes electric power netting safe running, adopt an effective measure and improve the electric power system quality of voltage, improve user's product quality and output, reduce equipment failure, cut down the consumption of energy, simultaneously, can obtain the full and accurate field data of pollution source load, thereby help the pollution source user to take the control measures of economical rationality, improve inner power utilization environment, guarantee the safe operation of consumer, bring good economic benefit and indirect social benefit to the user.
Summary of the invention
The objective of the invention is to deficiency at existing voltage quality monitoring technology, solved two aspect technology of the timing steady state measurement and the superpotential transient state waveform recording of quality of voltage, a kind of quality of voltage on-Line Monitor Device and method of monitoring each electric pressure simultaneously is provided.Adopt the monitoring equipment of the collection of 32 road high-speed multiple channels, startup automatically, regularly measurement, calculating, statistics and storage voltage quality, simultaneously the steady-state quantity and the transient state amount of monitoring voltage.The software of device adopts linux operating system, over-voltage waveform and voltage deviation, harmonic wave, voltage fluctuation and the flickering of stable state, the timing of tri-phase unbalance factor of transient state are measured, two aspect technology are carried out data sharing, use the mode of Web/Brower, adopt the FTP service to carry out remote data transmission, employing MySql database carries out the storage of data etc.
Power system voltage quality on-line monitoring device of the present invention has solved different that the stable state of superpotential transient state waveform and other quality of voltage regularly measures, and is the on-Line Monitor Device of measuring voltage quality stable state and Temporal Data simultaneously at present.
The technical solution used in the present invention is:
Apparatus of the present invention are by forming with the lower part: plurality of voltages signal Processing front end, industrial computer, multipath high-speed capture card, standard electric air screen, display, printer, AC power isolated part and input terminal etc.
Apparatus of the present invention can be gathered 32 road voltages simultaneously, and frequency acquisition is up to 1MHz, and 32 tunnel while frequency acquisitions can reach 20kHz, and voltage signal can insert from voltage transformer secondary side, also can be inserted by the voltage divider low-voltage arm.
Plurality of voltages signal Processing Front-end Design become can processes voltage transient state and steady-state signal characteristics, emphasis has solved voltage transient fast and has changed the harm to the device data acquisition card of the superpotential that causes, solve the strong electromagnetic of electric system again, accurately measured the superpotential voltage signal of high frequency.The electric signal that plurality of voltages signal Processing front end inserts voltage transformer secondary side is carried out the photoelectricity isolated variable of AC signal, the both-end input, and each road voltage signal is isolated not altogether, has overcome that alternating voltage is interchannel to be disturbed altogether.
Industrial computer and the multi-channel high-speed capture card low voltage signal after with the front-end processing of plurality of voltages signal Processing is gathered, is calculated and stores, and acquisition software, Control Software, analysis software and bitcom environment are provided.Low-voltage signal after the front-end processing of plurality of voltages signal Processing is by the stube cable of special use, with the multi-channel data acquisition card connection of industrial computer.The multi-channel data acquisition card can provide 32 tunnel voltage measurement.Capture card is the PCI type, and industrial control computer mainboard adopts Intel P4 2.0G CPU, internal memory 1G, and hard disk 160G capacity adopts linux operating system, keeps WEB service, FTP service and MySql database service.Acquisition software, Control Software, analysis software and bitcom supervisor adopt the standard C language exploitation.The Apache service of WEB service employing standard.Adopt cgi script that User Interface is provided, use the mode of WEB browser to operate, can realize Long-distance Control and data transmission.Automatically activated signal adopts voltage jump amount mode to start.
The 220V ac power supply system that step-down is isolated makes the power supply and the externally fed power supply electromagnetic isolation of device, when avoiding the on-the-spot supply voltage of electric system higher, has avoided the noise jamming of power supply.
A kind of power system voltage quality on-line monitoring method is utilized apparatus of the present invention, monitors by program, and its concrete method step is as follows:
(1) initialization: the different electric pressure of monitoring is set cycle, user's name and the infield etc. of the timing calculating of the voltage starting value of different acquisition channels, deviation, harmonic wave, voltage fluctuation and the flickering of selecting frequency acquisition, data record size, voltage, tri-phase unbalance factor as required.The WEB that starts Linux serves, FTP serves etc.Gathering master routine starts simultaneously.
(2) data acquisition: (1) step finish after, carry out real time on-line monitoring and timing sampling by the measurement passage that inserts this device by voltage transformer (VT), measure the voltage signal of 32 passages by the multi-channel data acquisition card, real-time acquired signal, 32 passages of every half-full data carry out continuous sampling.
(3) carry out the record ripple of transient overvoltage: in (2) step, capture card begins to transmit this half-full data by the monitoring capture program after collecting half-full data, and capture card is then proceeded next half-full data acquisition.Program is calculated current half-full data, the filtered peak value of each voltage channel that obtains, compare with the initial value of each path setting before, if passage difference does not relatively all surpass the startup value of respective channel arbitrarily, then current peak value is set to new initial value, continue the new half-full comparing data collection of wait and finish, carry out round-robin relatively; If the difference of a certain passage comparison has surpassed the startup value, the data of all 32 passages of opening entry then, the time span that continuous recording is set, simultaneously with the beginning of last half-full data as record, the waveform that obtains so then comprises before the fault and the complete waveform after the fault.
(4) data storage of transient overvoltage: in (3) step, finish the data of a stipulated time length at record after, the data of record are carried out data processing such as filtering, final data is stored in the hard disk, write various parameter setting information in data file.Turned back to for (2) step after storage finishes, proceed data acquisition.
(5) timing of other steady state voltage amounts is measured: according to the initialization setting, at official hour at interval, be extracted in current half-full data of (2) step, deviation, harmonic wave, voltage fluctuation and the flickering, the tri-phase unbalance factor that carry out voltage calculate, after the various quality of voltage data values that obtain carry out corresponding software processes, obtain stable quality of voltage numerical value, each numerical value and corresponding time are stored.Regularly stored voltage quality numerical value and time, finally provide long quality of voltage statistical value, device can be stored the quality of voltage numerical value in 1 year continuously.
(6) data storage, Long-distance Control and data transmission: WEB service provides data analysis and remote control function, and the FTP service provides the teletransmission function of data.The MySql database service provides the store-service of steady state voltage amount.(SuSE) Linux OS possesses the multitask service function, does not influence the operation and the storage of image data in remote analysis and control, possesses good stable simultaneously.
Apparatus of the present invention possess by computer network carries out distant place control and transfer function, adopt linux operating system, employing standard TCP/IP communications protocol, device can be arranged to IP address arbitrarily, can realize that by the general browser on the computer network real-time control apparatus controls, analyzes, shows and function such as transmission.Device at substation operation joins computer network as long as pass through the standard computer netting twine, disposes corresponding IP address simultaneously, just can be implemented on the computer network and no matter still controls and data transmission in the strange land in the locality.
Apparatus of the present invention exploitation on-line analysis software can be realized the on-the-spot data analysis and the demonstration and the printing function of waveform to use the CGI functional development.It mainly is to work out data and curves amplification computing function and statistical report form function flexibly that data are analyzed demonstration, can carry out various calculating, comprise: superpotential multiple and frequency, harmonic wave qualification rate, flickering when flickering in short-term and length, voltage deviation statistics, Voltage unbalance statistics etc.The printing function that provides can provide the printing of various curves and result of calculation easily, and the chart printing function of various quality of voltage statisticss is provided simultaneously.
The technology of the present invention innovative point is:
1) the transient overvoltage waveform in the quality of voltage of apparatus of the present invention monitoring, frequency acquisition can reach 32 passages frequency acquisition 20kHz simultaneously, and over-voltage waveform can reach 5 seconds writing time.Reach the overall process record for the Hyper-Voltage of Power Systems transition effect.
2) apparatus of the present invention can be carried out the calculating of superpotential multiple and frequency to self registering superpotential transient state waveform, can calculate the harmonic wave of any one cycle in the over-voltage waveform simultaneously, provide harmonic wave resultant distortion rate, 2-100 time harmonic value and harmonic content.
3) apparatus of the present invention, possesses the function of measuring according to each timing voltage of the needs record of each national Specification of voltage monitoring simultaneously, carry out deviation, harmonic wave, voltage fluctuation and the flickering of voltage, the steady-state quantity of tri-phase unbalance factor, and can the data in 1 year of cycle index.
4) over-voltage measurement adopts the Starting mode of voltage jump amount.Apparatus of the present invention can arbitrary value be set the superpotential startup value of any passage, and a power frequency cycle can judge whether to reach entry condition, and the judgment mode of window type can be pounced on and grasp jumping and bust of voltage.The function of manual record is provided, is used to measure the voltage waveform of current time.
5) apparatus of the present invention adopt linux operating system, possess the computer networking function, can realize Long-distance Control, data transmission and data analysis, and online data analysis software is provided, and the statistical report form function of various transient state wave form analyses and steady state data is provided.
Description of drawings
Fig. 1 is one-piece construction figure of the present invention.
Fig. 2 is a power system voltage quality on-line monitoring method flow diagram.
Fig. 3 is a power system voltage quality online monitoring system structural drawing.
Embodiment
The voltage signal of device can be from voltage transformer secondary side, or the voltage divider low-voltage arm inserts apparatus of the present invention, through plurality of voltages signal Processing front end, voltage signal processed is linked in the industrial computer in the data collecting card through private cable, acquisition software will be according to concrete parameter circle collection processes voltage signal, after reaching the entry condition of setting or carry out the record of over-voltage waveform after receiving control command or regularly measure the steady state voltage amount, the data that obtain are calculated and stored.
Claims (8)
1. power system voltage quality on-line monitoring device and method are by forming with the lower part: plurality of voltages signal Processing front end, industrial computer, multipath high-speed capture card, standard electric air screen, display, printer, AC power isolated part and input terminal etc.
2. device and method according to claim 1, it is characterized in that: voltage analog 32 tunnel, hyperchannel frequency acquisition simultaneously can reach 20kHz, and each road analog channel inserts voltage, can insert from voltage transformer secondary side, also can insert by the voltage divider low-voltage arm.
3. device and method according to claim 1 is characterized in that: the data transient state waveform characteristics that need gather at the alternating voltage of electric system design.Considered the processing of the transient signal of over-voltage measurement on circuit design emphatically, the logical frequency of band reaches 100kHz; Voltage signal adopts the both-end input, and each road signal is isolated from each other not altogether, simultaneously, primary voltage and secondary voltage is carried out the photoelectricity isolation, guarantees the safety and the measuring accuracy of equipment capture card.
4. device and method according to claim 1 is characterized in that: insert plurality of voltages signal Processing front end after the voltage process voltage transformer (VT) conversion of electric system.In plurality of voltages signal Processing front end, become low-voltage signal, be connected with capture card then through plurality of voltages signal-processing board isolation processing; Adopt the electric supply system of isolating,, avoid the interference of alternating current 220V power supply whole harvester and external isolation.
5. industrial computer and multipath high-speed capture card are responsible for signal is gathered, calculated and stores, and Control Software and communication part software runtime environment are provided simultaneously; Plurality of voltages signal Processing front end is connected to 32 passages by terminal board and private cable, in the 1M/s high-speed multifunctional capture card.
6. device and method according to claim 1 is characterized in that: apparatus of the present invention can be set over-voltage waveform record startup value arbitrarily to any passage, and the function of manual record real-time waveform is provided simultaneously; Automatically activated signal adopts voltage jump amount window mode to start.
7. device and method according to claim 1, it is characterized in that: this device can carry out superpotential monitoring in the quality of voltage, the over-voltage waveform of record is provided, can carries out superpotential wave form analysis, calculate superpotential multiple, frequency and time span etc.
8. device and method according to claim 1, it is characterized in that: device possesses Long-distance Control and transfer function, adopt the TCP/IP communications protocol of (SuSE) Linux OS, the IP address of setting device, by the browser in other computing machine in the computer network, can real-time control apparatus, setup parameter carries out the functions such as transmission of data analysis and data.
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| CN102269779A (en) * | 2011-06-22 | 2011-12-07 | 哈尔滨电工仪表研究所 | Voltage fluctuation recording device based on DLMS (distribution line message specification)/COSEM (companion specification for energy metering) |
| CN103048532A (en) * | 2011-10-14 | 2013-04-17 | 安徽一天电气技术有限公司 | Transient waveform full voltage fault recording online detection device and working method thereof |
| CN103063985A (en) * | 2012-12-19 | 2013-04-24 | 中国电力科学研究院 | Very fast transient overvoltage horizontal identification method |
| CN103364723A (en) * | 2012-04-05 | 2013-10-23 | 北京光耀能源技术股份有限公司 | Running state analysis method for aerogenerator based on voltage and current balance |
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| CN103048532A (en) * | 2011-10-14 | 2013-04-17 | 安徽一天电气技术有限公司 | Transient waveform full voltage fault recording online detection device and working method thereof |
| CN103048532B (en) * | 2011-10-14 | 2015-07-15 | 安徽一天电气技术有限公司 | Transient waveform full voltage fault recording online detection device and working method thereof |
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| CN103063985A (en) * | 2012-12-19 | 2013-04-24 | 中国电力科学研究院 | Very fast transient overvoltage horizontal identification method |
| CN103063985B (en) * | 2012-12-19 | 2015-08-05 | 中国电力科学研究院 | A kind of very fast transient overvoltage horizontal identification method |
| CN104502669A (en) * | 2014-12-24 | 2015-04-08 | 镇江长河电力技术有限公司 | Special monitoring system for voltage quality of China Mobile DDN (digital data network) dedicated line |
| CN105067866A (en) * | 2015-08-14 | 2015-11-18 | 武汉华中数控股份有限公司 | General voltage test device |
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| CN107144726B (en) * | 2017-06-09 | 2019-11-15 | 深圳市中电电力技术股份有限公司 | A kind of A step voltage transient state monitoring device, method and system |
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Inventor after: Han Bing Inventor after: Si Deliang Inventor after: Zhang Kai Inventor after: Bian Yang Inventor after: Meng Dawei Inventor after: Wen Xianglong Inventor after: Chen Yue Inventor after: Song Chaohui Inventor after: Han Honggang Inventor before: Han Bing Inventor before: Si Deliang Inventor before: Zhang Kai Inventor before: Bian Yang Inventor before: Meng Dawei Inventor before: Wen Xianglong Inventor before: Chen Yue Inventor before: Song Chaohui |
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Free format text: CORRECT: INVENTOR; FROM: HAN BING SI DELIANG ZHANG KAI BIAN YANG MENG DAWEI WEN XIANGLONG CHEN YUE SONG ZHAOHUI TO: HAN BING SI DELIANG ZHANG KAI BIAN YANG MENG DAWEI WEN XIANGLONG CHEN YUE SONG ZHAOHUI HAN HONGGANG Free format text: CORRECT: ADDRESS; FROM: 150030 HARBIN, HEILONGJIANG PROVINCE TO: 100031 DONGCHENG, BEIJING |
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Effective date of registration: 20131126 Address after: 100031 West Chang'an Avenue, Beijing, No. 86 Patentee after: State Grid Corporation of China Patentee after: Heilongjiang Electric Power Research Institute Patentee after: Electric Power Research Institute of State Grid Liaoning Electric Power Co., Ltd. Address before: 150030 Xiangjiang Road, Xiangfang District, Heilongjiang, No. 7, No. Patentee before: Heilongjiang Electric Power Research Institute Patentee before: State Grid Corporation of China |