CN101957396B - 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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- CN101957396B CN101957396B CN 200910072501 CN200910072501A CN101957396B CN 101957396 B CN101957396 B CN 101957396B CN 200910072501 CN200910072501 CN 200910072501 CN 200910072501 A CN200910072501 A CN 200910072501A CN 101957396 B CN101957396 B CN 101957396B
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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 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 the 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 be more obvious on the impact of operation of power networks, sensitive electrical appliances and harm, and be embodied as: exceed standard loss increase, the lost of life, the work that can make consumer of voltage deviation be undesired; The fluctuation of voltage and flickering exceed standard and can endanger the equipment that is connected to other users of public supply terminals with it, and the possibility that electric power accident occurs will progressively show as by the defective institute of the quality of power supply and cause.So; prevent that superpotential is to the infringement of operation power equipment; or infringement reduced to minimum; know for sure and be subject 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 the information such as superpotential multiple and frequency; to superpotential situation, protection of arrester level and the residual voltage etc. of operation transformer station are whether effective etc. clearly data arranged, just can the fast finding fault and the reason of abnormal accident, the failure rate of minimizing electric system.
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, comprehensively, the at length variation of analytical voltage quality index, the hidden danger that in time discovery 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, reduce energy consumption, 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 social benefit indirectly to the user.
Summary of the invention
The object of the invention is to the deficiency for existing voltage quality monitoring technology, solved the timing steady state measurement of quality of voltage and two aspect technology of superpotential transient-wave record, a kind of quality of voltage on-Line Monitor Device and method of monitoring simultaneously each electric pressure is provided.Adopt the monitoring equipment of the collection of 32 road high-speed multiple channels, automatically startup, Timing measurement, calculating, statistics and storage voltage quality, simultaneously steady-state quantity and the transient of monitoring voltage.The software of device adopts linux operating system, with the over-voltage waveform of transient state and voltage deviation, harmonic wave, voltage fluctuation and the flickering of stable state, the Timing measurement of tri-phase unbalance factor, two aspect technology are carried out data sharing, use the mode of Web/Brower, adopt the FTP service to carry out remote data transmission, adopt the MySql database to carry out data storage etc.
Power system voltage quality on-line monitoring device of the present invention has solved stable state Timing measurement different of superpotential transient-wave and other quality of voltage, is the present on-Line Monitor Device of measuring voltage quality Steady state and transient state data simultaneously.
The technical solution used in the present invention is:
Apparatus of the present invention are comprised of following part: the plurality of voltages signal is processed 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 gather 32 road voltages simultaneously, and frequency acquisition is up to 1MHz, and 32 tunnel while frequency acquisitions can reach 20kHz, and voltage signal can access from voltage transformer secondary side, also can be accessed by the voltage divider low-voltage arm.
The plurality of voltages signal is processed transient state and the steady-state signal characteristics that Front-end Design becomes can process voltage, emphasis has solved voltage transient fast and has changed the superpotential that causes to the harm of device data acquisition card, solved again the strong electromagnetic of electric system, Measurement accuracy the superpotential voltage signal of high frequency.The plurality of voltages signal is processed front end carries out AC signal to the electric signal of voltage transformer secondary side access photoelectricity isolated variable, and both-end input, each road voltage signal isolation have overcome that alternating voltage is interchannel to be disturbed altogether or not.
The low voltage signal that industrial computer and multi-channel high-speed capture card are processed the plurality of voltages signal after the front-end processing gathers, calculates and stores, and acquisition software, control software, analysis software and bitcom environment are provided.The plurality of voltages signal is processed the low-voltage signal after the front-end processing, by the stube cable of special use, with the multi-channel data acquisition board connection of industrial computer.Multi-channel data acquisition board can provide 32 tunnel voltage measurement.Capture card is the PCI type, and industrial control computer mainboard adopts Intel P42.0G 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 of step-down isolation makes 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 utilizes 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 is accessed this device by voltage transformer (VT), measure the voltage signal of 32 passages by multi-channel data acquisition board, the Real-time Collection 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 the comparison that circulates; If the difference of a certain passage comparison has surpassed the startup value, then begin to record the data of 32 all passages, the time span that continuous recording is set, simultaneously with the beginning of upper half-full data as record, the waveform that obtains so then comprises before the fault and the complete waveform after the fault.
(4) data of transient overvoltage storage: in (3) step, finish the data of a stipulated time length at record after, the data of record are carried out the data processing such as filtering, final data is stored in the hard disk, write various parameter setting information in data file.Store and turned back to for (2) step after complete, proceed data acquisition.
(5) Timing measurement of other steady state voltage amounts: according to the initialization setting, at the official hour 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 processing, obtain stable quality of voltage numerical value, each numerical value and corresponding time are stored.Regularly quality of voltage numerical value and the time of storage, finally provide long quality of voltage statistical value, device can the quality of voltage numerical value in 1 year of Coutinuous store.
(6) data storage, Long-distance Control and data transmission: WEB service provides data analysis and remote control function, and the FTP service provides the transporting 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 affect operation and the storage of image data in remote analysis and control, possesses simultaneously good stability.
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 arbitrarily IP address, can realize that by the general browser on the computer network real-time control apparatus controls, analyzes, shows and the function such as transmission.Device at substation operation joins computer network as long as pass through the standard computer netting twine, configures simultaneously corresponding IP address, just can realize no matter still controlling and data transmission in the strange land in the locality on computer network.
Apparatus of the present invention exploitation on-line analysis software can be realized on-the-spot data analysis and demonstration and the printing function of waveform to use the CGI functional development.Data analysis is shown it mainly is to work out flexibly data and curves amplification computing function and statistical report form function, can carry out various calculating, comprise: superpotential multiple and frequency, harmonic wave qualification rate, flickering when Short Term Flicker 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 simultaneously frequency acquisition 20kHz of 32 passages, 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 carry out the calculating of superpotential multiple and frequency to self registering superpotential transient-wave, can calculate simultaneously the harmonic wave of any one cycle in the over-voltage waveform, provide total harmonic distortion, 2-100 time harmonic value and harmonic content.
3) apparatus of the present invention, possesses simultaneously the function of measuring according to each timing voltage of the needs record of the every country standard code of voltage monitoring, 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 for measuring 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-wave analyses and steady state data is provided.
Description of drawings
Fig. 1 is one-piece construction figure of the present invention.
Fig. 2 is power system voltage quality on-line monitoring method process flow diagram.
Fig. 3 is power system voltage quality online monitoring system structural drawing.
Embodiment
The voltage signal of device can be from voltage transformer secondary side, or voltage divider low-voltage arm access apparatus of the present invention, process front end through the plurality of voltages signal, voltage signal after the processing is linked in the industrial computer in the data collecting card through private cable, acquisition software will be processed voltage signal according to concrete parameter circle collection, after reaching the entry condition of setting or carry out record or the Timing measurement steady state voltage amount of over-voltage waveform after receiving control command, the data that obtain are calculated and stored.
Claims (1)
1. power system voltage quality on-line monitoring method, described method realizes based on a kind of power system voltage quality on-line monitoring device, described device is by 32 road voltage acquisition channels (1), the plurality of voltages signal is processed front end (2), insulating power supply (3), industrial computer and 32 road analog acquisition cards (4), data communication and remote control unit (5), display (7) and printer (6) consist of, the signal output part of 32 road voltage acquisition channels (1) connects the signal input part that the plurality of voltages signal is processed front end (2), the plurality of voltages signal is processed the signal output part connection industrial computer of front end (2) and the signal input part of 32 road analog acquisition cards (4), the signal input part of the signal output part connection data communication of industrial computer and 32 road analog acquisition cards (4) and remote control unit (5), industrial computer with are connected another signal output part of road analog acquisition card (4) and connect the signal input part of display (7), industrial computer with are connected another signal output part of road analog acquisition card (4) and connect the signal input part of printer (6), insulating power supply (3) is processed front end (2) and industrial computer and is connected road analog acquisition card (4) and is connected with the plurality of voltages signal respectively;
Described quality of voltage on-Line Monitor Device can gather 32 road voltage analogs simultaneously, and hyperchannel gathers simultaneously, and frequency reaches 20kHz, and the access voltage of each road analog channel accesses from voltage transformer secondary side;
This quality of voltage on-Line Monitor Device provides the function of manual record real-time waveform simultaneously to any passage Set arbitrarily over-voltage waveform record startup value;
This quality of voltage on-Line Monitor Device is carried out superpotential monitoring in the quality of voltage, and the over-voltage waveform of record is provided, and carries out superpotential wave form analysis, calculates superpotential multiple, frequency and time span;
This quality of voltage on-Line Monitor Device possesses Long-distance Control and transfer function, adopt the TCP/IP communications protocol of (SuSE) Linux OS, the IP address of this device is set, by the browser in other computing machine in the computer network, control in real time this device, setup parameter carries out data analysis and data transfer;
It is characterized in that described method comprises the steps: (one) initialization: the different electric pressure of monitoring is set cycle, user's name and the infield of the timing calculating of the over-voltage waveform record startup 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; Start WEB service and the FTP service of linux; Gathering master routine starts simultaneously;
(2) data acquisition: (one) step finish after, carry out real time on-line monitoring and timing sampling by the measurement passage that is accessed this quality of voltage on-Line Monitor Device by voltage transformer (VT), measure the voltage signal of 32 passages by 32 road analog acquisition cards, the Real-time Collection signal carries out continuous sampling to each half-full data of 32 passages;
(3) carry out the record ripple of transient overvoltage; In (two) step, after 32 road analog acquisitions are stuck in and collect half-full data, begin to transmit this half-full data by gathering master routine, 32 road analog acquisition cards are then proceeded next half-full data acquisition; Gather master routine and calculate current half-full data, the filtered peak value of each voltage channel that obtains compares with the initial value of each path setting before, if passage difference does not relatively all surpass the over-voltage waveform record 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 the comparison that circulates; If the difference of a certain passage comparison has surpassed over-voltage waveform record startup value, then begin to record the data of 32 all passages, the time span that continuous recording is set, with the beginning of upper half-full data as record, the waveform that obtains so then comprises before the fault and the complete waveform after the fault simultaneously;
(4) data of transient overvoltage storage: in (three) step, finish the data of a stipulated time length at record after, the data of record are carried out filtering data process, final data is stored in the hard disk, write various parameter setting information in data file; Store and turned back to for (two) step after complete, proceed data acquisition;
(5) Timing measurement of other steady state voltage amounts; According to the initialization setting, at the official hour interval, be extracted in current half-full data of (two) step, deviation, harmonic wave, voltage fluctuation and the flickering, the tri-phase unbalance factor that carry out voltage calculate, the various quality of voltage data values that obtain obtain stable quality of voltage numerical value after carrying out corresponding software processing; Each numerical value and corresponding time are stored; Regularly quality of voltage numerical value and the time of storage, finally provide long quality of voltage statistical value, the quality of voltage numerical value in 1 year of this device Coutinuous store;
(6) data storage, Long-distance Control and data transmission.
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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) |
| 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 |
| CN103364723B (en) * | 2012-04-05 | 2015-12-16 | 北京光耀能源技术股份有限公司 | Based on the running status of wind generator analytical approach of electric current and voltage balance |
| 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 |
| CN105067866B (en) * | 2015-08-14 | 2017-10-31 | 武汉华中数控股份有限公司 | A kind of common voltage test device |
| 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 |
| CN110554231A (en) * | 2019-07-24 | 2019-12-10 | 深圳供电局有限公司 | Voltage monitoring method, voltage monitoring device, computer equipment and storage medium |
| CN111123005A (en) * | 2019-12-26 | 2020-05-08 | 深圳供电局有限公司 | Power quality monitoring system for outgoing line position of power distribution room user |
| CN111722061A (en) * | 2020-07-01 | 2020-09-29 | 上海恒敬电力科技有限公司 | But early warning device of remote monitoring power distribution station overvoltage operation |
| CN115498689A (en) * | 2022-09-29 | 2022-12-20 | 国网江苏省电力有限公司南通供电分公司 | Distributed power supply access point power quality assessment system |
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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 |