CN103323686B - A kind of intelligent grid power quality analyzer - Google Patents
A kind of intelligent grid power quality analyzer Download PDFInfo
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- CN103323686B CN103323686B CN201210073137.0A CN201210073137A CN103323686B CN 103323686 B CN103323686 B CN 103323686B CN 201210073137 A CN201210073137 A CN 201210073137A CN 103323686 B CN103323686 B CN 103323686B
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Abstract
The present invention relates to a kind of intelligent grid power quality analyzer, comprise base plate, for control panel and the display unit of data processing and communication, described control panel comprises analog switched power supply, signal transducer, operational amplifier, A/D conversion chip, control chip and communication module, described analog switched power supply is concatenation operation amplifier respectively, A/D conversion chip, control chip and display unit, the output terminal concatenation operation amplifier of described signal transducer, described operational amplifier is by A/D conversion chip and control chip, the output terminal of described control chip is connected with display unit by communication module.Compared with prior art, the present invention has easy for installation, and wiring is simple, and easy to maintenance, quantities is little, and accuracy of data acquisition is high, and data processing is rapid, and control system is stablized, and networking is light, the advantages such as strong interference immunity.
Description
Technical field
The present invention relates to a kind of intelligent grid power quality data monitoring equipment, especially relate to a kind of intelligent grid power quality analyzer.
Background technology
The quality of power supply (PowerQuality), from the strict meaning, the leading indicator weighing the quality of power supply has voltage, frequency and waveform.Refer to quality supply from universal significance, comprise quality of voltage, current quality, power supply quality and power quality.It can be defined as: the deviation causing the voltage of consumer fault or cisco unity malfunction, electric current or frequency, and its content comprises frequency departure, voltage deviation, voltage fluctuation and flicker, three-phase imbalance, temporary transient or transient overvoltage, wave form distortion (harmonic wave), voltage dip, interruption, temporary liter and power supply continuity etc.
Along with the development of national economy and the raising of people's lives, the requirement of the quality of power supply is improved constantly, the requirement of power quality standard is also being improved constantly.In recent years, country has issued a collection of power quality standard, has substantially adapted to the requirement of both sides of supply and demand in production run.
Before, what the dynamometer instrument meter in industry was mainly measured is all voltage, these master datas of electric current, effectively can not monitor the power quality data such as three-phase imbalance, voltage fluctuation and flicker in electric system.Therefore a perfect analysis can not be done to the system situation in electrical network.
Intelligent grid, it is exactly the intellectuality of electrical network, be also referred to as " electrical network 2.0 ", it is based upon on the basis of integrated, high-speed bidirectional communication network, by the application of the decision support system (DSS) technology of the sensing of advanced person and measuring technique, advanced equipment and technology, advanced control method and advanced person, realize the target of reliable, safety, the economy of electrical network, efficient, environmental friendliness and use safety.
Chinese energy expert Wu Jiandong proposes " interactive electrical network " concept.Interactive electrical network, English is InteractiveSmartGrid, and the implication of intelligent grid contains wherein by it.Interactive electrical network is defined as: on open and interconnected information pattern basis, by loading system digital device and upgrading electricity grid network management system, realizing the full-range intellectuality of power industry, informationization, the classification interactive management such as generating, transmission of electricity, power supply, electricity consumption, client's sale of electricity, electrical network graded dispatching, integrated service, is the comprehensive efficiency change of having gathered Industrial Revolution, technological revolution and management revolution.It will reproduce the information circuits of electrical network, build the feedback system that user is novel, and promoting electrical network Holistic Transformation is energy-conservation infrastructure, improve energy efficiency, reduce client cost, reduce greenhouse gas emission, create the maximization that electrical network is worth.
Interactive electrical network can also by electric terminal by between user, form network interdynamic between user and grid company and be immediately connected, realize the real-time of electric power data reading, at a high speed, two-way general effect, can data in integration system, improve the integrated effect of central power system, realize the protection of effective critical load, realize the seamless interlinkage of various power supply and client terminal and electrical network, the management of electrical network can be optimized thus, electrical network is promoted to the new mode of interactive running, form the service function that electrical network is brand-new, improve the reliability of whole electrical network, availability and overall efficiency.
In the Substation Automation System evolution of nearly 20 years, along with popularizing of intelligent electronic device, form many individual event automated systems, relatively independent between these systems, there is no direct electrical link, usually managed by the different department of electric power enterprise, safeguarded.Due to of a great variety, the interface provided and function different, equipment room can not share information, formed " island of automation " problem, not only increase cost, also the reliability of influential system, the maintenance workload of adding users.Current various Integrated Solution all can not provide high-level information sharing.In this context, International Electrotechnical Commission proposes IEC61850 standard.This is a network communication system standard, comprises object-oriented, communication network, interface and many-sided content such as mapping, systems and management project.
IEC61850 is as the Standards Code of digital transformer substation, there is the feature such as unification, specification, self-described, easily expansion, thoroughly solve current traditional transformer station stipulations of a great variety, incompatible, be difficult to the features such as expansion, by unique stipulations of transformer station after becoming.
Summary of the invention
Object of the present invention is exactly provide a kind of precision high, low in energy consumption, easy for installation to overcome defect that above-mentioned prior art exists and meet the intelligent grid power quality analyzer of digital transformer substation standard criterion.
Object of the present invention can be achieved through the following technical solutions:
A kind of intelligent grid power quality analyzer, it is characterized in that, comprise base plate, for control panel and the display unit of data processing and communication, described control panel comprises analog switched power supply, signal transducer, operational amplifier, A/D conversion chip, control chip and communication module, described analog switched power supply is concatenation operation amplifier respectively, A/D conversion chip, control chip and display unit, the output terminal concatenation operation amplifier of described signal transducer, described operational amplifier is by A/D conversion chip and control chip, the output terminal of described control chip is connected with display unit by communication module,
Signal transducer is by the signal collected by being transferred to control chip after operational amplifier and A/D conversion chip, and control chip shows in real time to transferring data to display unit after signal transacting, realizes on line real-time monitoring.
Described communication module comprises 232 communication chips, 485 communication modules and ethernet communication module.
Described base plate is provided with the connection terminal and ethernet communication interface that connect external sampling, described connection terminal is connecting analog Switching Power Supply and signal transducer respectively, and described ethernet communication interface is connected with remote terminal monitoring equipment by described ethernet communication module.
Also comprise DC/DC converter, this DC/DC switch input is connected with analog switched power supply, output terminal is connected with A/D conversion chip, amplifier amplifier respectively, the portion voltage that analog switched power supply exports is converted to the normal working voltage of A/D conversion chip, amplifier amplifier by described DC/DC converter, and described DC/DC converter is isolation voltage regulation type converter.
Described signal transducer comprises voltage transformer (VT) summation current transformer.
Described operational amplifier is instrumentation amplifier.
Described A/D converter chip is 16 6 passage A/D converter chips.
Described control chip comprises dsp chip and ARM chip, the input end of described dsp chip connects described A/D conversion chip, the output terminal of dsp chip connects ARM chip, described ARM chip is connected with display unit by communication module, described dsp chip is responsible for the collection of digital signal and is converted various digital signal to various power quality data, described ARM chip reads various power quality data from dsp chip, and sends data to display unit by communication module.
Described display unit is touch LCD screen.
Compared with prior art, the present invention has following advantage:
1) high-precision data conversion: the present invention adopts the A/D converter chip of 16 6 passages and error to be only the instrument amplifier of ppt, data acquisition is by instrument amplifier, be transferred to high-precision A/D conversion chip again, and calculate accurate data by control chip eventually through algorithm;
2) ability adapting to site environment is strong: current sample of the present invention carries out the collection of data by the mode of outside external mutual inductor, has very high changeability and adaptability, according to the different situations of site environment, is equipped with different outside mutual inductors;
3) have jumbo memory function and preserve data unload function: inside of the present invention is furnished with jumbo pin-saving chip, can for the historical data storing some months, this kind of historical data is all kinds of qualities of power supply in measure field electric system, and the various historical datas of preserving all download in USB flash disk by USB port;
4) abundant data and figure display: the present invention can show a large amount of power quality datas, such as voltage, current distortion rate, 1 ~ 50 subharmonic, Voltage unbalance and current imbalance etc., these are all the power quality datas that conventional electric power table meter does not have, and present invention employs high-resolution touch liquid crystal display, it is more convenient to use, the interface of display is more friendly, and the blocked operation between different interface is more smooth;
5) many kinds of parameters can be established: the invention provides miscellaneous parameter, can arrange accordingly, considerably increase the dirigibility that monitor uses for user for different measuring objects, relative to conventional electric power table meter, more convenient in use;
6) abundant external communication port, networking is light: present invention employs bus structure, the various communication interface of easily extensible, support IEC61850 stipulations, meet transformer substation communication system, can compose in parallel and carry out communication with PC and other multiple host computer platform by multiple devices, user is made to realize remote monitoring, the equipment erecting stage of noting be used in is namely by host computer platform Real-time Monitoring Data, meet the construction requirements of the automation of transformation substations, facilitate the management of various IED and the interconnected of equipment room in transformer station, realize the seamless link of system;
7) acp chip is powerful: the present invention adopt the most modern microprocessor and and Digital Signal Processing, the data processing function of dsp chip is powerful, computation and analysis can be carried out rapidly to sampled data, and can process data in enormous quantities, and ARM chip is advantageous in the control of hardware, response speed is very fast simultaneously, and it is low in energy consumption, all kinds of operational order of response that can be very smooth, and have and abundant extend out function, support various communication interfaces;
8) more advanced, more effective algorithm: the present invention adopts novel fast Fourier analysis to combine with instantaneous reactive, chip can be extracted fast and accurately to sample the harmonic content data obtained, reach the effect of frequency analysis accurately, and the present invention adopts flickering and the fluction analysis of total digitalization, more effective than traditional analog quantity analysis, quicker, integrated higher;
9) power consumption is very low: when normally working, and power consumption is less than 10VA;
10) easy for installation: only to need and the three-phase voltage of equipment under test and the connection with extraneous mutual inductor, can normally work, need not other equipment connections of peripheral hardware again.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is workflow diagram of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
As shown in Figure 1, ACT-X intelligent grid power quality analyzer, comprises base plate, for the control panel of data processing and communication and display unit: base plate is provided with the connection terminal and ethernet communication interface that are connected external sampling, control panel comprises analog switched power supply 1, signal transducer 2, operational amplifier 3, A/D conversion chip 4, control chip 5 and communication module, analog switched power supply 1 is concatenation operation amplifier 3 respectively, A/D conversion chip 4, control chip 5 and display unit, the independent input of analog switched power supply 1 is connected with connection terminal, the input end of signal transducer 2 is also connected with connection terminal, the output terminal concatenation operation amplifier 3 of signal transducer 2, operational amplifier 3 is by A/D conversion chip 4 and control chip 5, the output terminal of control chip 5 is connected with display unit by communication module, communication module comprises 232 communication chips, 485 communication modules and ethernet communication module, display unit is touch LCD screen 6.
Signal transducer 3 comprises voltage transformer (VT) summation current transformer.Signal transducer 2 by the signal collected by being transferred to control chip 5 after operational amplifier 3 and A/D conversion chip 4, transfer data to display unit 6 after control chip 5 pairs of signal transacting to show in real time, or transfer data to remote terminal monitoring equipment by ethernet communication interface and ethernet communication module and realize on line real-time monitoring.
DC/DC converter 7 is also provided with between analog switched power supply 1 and operational amplifier 3 and A/D conversion chip 4, DC/DC converter 7 converts the portion voltage that analog switched power supply exports the normal working voltage of amplifier amplifier 3, A/D conversion chip 4 to, and DC/DC converter 7 is isolation voltage regulation type converter.DC/DC converter 7 has voltage input end, earth terminal, voltage output end, and the positive supply of A/D conversion chip 4 and communication module, earth terminal are connected with the voltage output end of DC/DC converter 7, earth terminal respectively.Operational amplifier 3 adopts instrumentation amplifier, and A/D conversion chip adopts 16 6 passage A/D conversion chips.
DC/DC transducer is divided into isolated form and non-isolation type, both differences are: the ground of isolated form with being divided into input with output ground, and non-isolation type only has a ground, the effect of employing non-isolation type can be more better, can improve the isolation voltage level of system, but the DC/DC of isolated form is usually more expensive than non-isolation type.
Control chip 4 comprises dsp chip and ARM chip, and the input end of dsp chip connects A/D conversion chip, and the output terminal of dsp chip connects ARM chip, and ARM chip is connected with display unit by communication module.Wherein dsp chip primary responsibility digital signal collection and convert various digital signal to various power quality data by programmed algorithm.And ARM chip primary responsibility reads various power quality data and data communication from dsp chip, send data to liquid crystal display display by 232 communication chips or 485 communication modules, by ethernet communication interface, data and remote terminal are carried out message exchange.The simultaneously control of ARM chip also participation device, the various functions of its opertaing device, the such as function such as optimum configurations, data download, and the changing interface etc. of touch screen operation.RTU (remote terminal unit) to be connected with ethernet communication interface of the present invention by netting twine and to communicate, and is realized the functions such as remote data monitoring, optimum configurations, data download by supporting upper computer software.
As shown in Figure 2, the workflow of ACT-X intelligent grid power quality analyzer is as follows:
After device power-up, namely sampling section begins through information sensor 2 and carries out data acquisition, after operational amplifier 3 and A/D conversion chip 4 by digital data transmission to control chip 5, control chip 5 starts the calculating carrying out data after gathering the data of a cycle, the data acquisition of Here it is acquiescence duty following table meter and calculation process;
After the page turn over operation of carrying out LCDs 6, program starts the function judging button: when program judges button operation as entering real time data interface, frequency analysis interface, quality of power supply number interface, liquid crystal display page turning is to the page of above-mentioned 3 kinds of data display, and then the data simultaneously read required for this page of data to control chip show;
When program judges that button operation is waveform display interface, histogram display interface, the page of supreme this figure display of liquid crystal display page turning: at waveform display interface, liquid crystal display reads real-time data point position to control chip, is presented on screen by the waveform of three-phase voltage, three-phase current; When histogram display interface, liquid crystal display reads the data of each harmonic content to control chip, and the data of reference first-harmonic, the size of each harmonic table is presented on screen by histogram intuitively with the form of a number percent;
When program judges to need to enter data download interface, liquid crystal display page turning is to this interface: in this page, user can select the download of current real-time data and the download of a historical data, when user selects real time data to download, by the text document of a generation real time data in USB flash disk, the current real time data calculated is transferred in the real time data text document in USB flash disk by control chip by USB interface;
When user selects the download of historical data, program can according to the date of the data of preserving in storage chip, the text document on corresponding date is generated in USB flash disk, and control chip reads in storage chip the historical data of preserving, and these data to be saved in USB flash disk in corresponding text document according to the date;
When program judges to need to enter optimum configurations interface, liquid crystal display page turning is to this interface.Now user can need amendment and parameters according to difference, and after click save button, ACT-X electric energy quality monitor gets back to the display of initial interface, and program gets back to the beginning of master routine, restarts the operation of a flow process according to the value of optimum configurations.
The present invention is by ethernet communication interface, follow 61850-5 communication protocol, be connected with remote terminal monitoring equipment, remote terminal monitoring equipment carries out real time data observation by supporting upper computer software to this instrument, remote data is downloaded, optimum configurations, gets over the operations such as report from a liner police is arranged, can also form data analysis report on demand.
Applying flexible of the present invention is changeable, and it can be used alone as instrument, also can be used as the front end original paper of intelligent grid supervisory system, in order to realize remote data acquisition and information gathers.The RS-485 communication interface of industrial standard, Modbus communications protocol, ethernet communication module and Various types of data communications protocol can be converted to the protocol transform module of 61850 stipulations, make networking easily convenient, and there is USB field data download function, user both can have been passed through also to have been facilitated in device context analysis understanding power status by upper computer software Real-Time Monitoring substation equipment ruuning situation at remote terminal monitoring equipment.Easy for installation of equipment need from the sample line being sampled end and introducing three-phase voltage, three-phase current, and the supply line of one group of alternating current 220V, normally can carry out work.
The present invention, as the intellectuality of a kind of advanced person, digitized electrical network front-end collection original paper, can be applied to various control system, energy management system, power transformation automation, distribution network automated, community power monitoring is monitored, industrial automation, intelligent building, intelligent power distribution dish, switch cubicle.The present invention has easy for installation, and wiring is simple, and easy to maintenance, quantities is little, and accuracy of data acquisition is high, and data processing is rapid, and control system is stablized, and networking is light, strong interference immunity, the features such as on-the-spot usb data download.And owing to present invention employs advanced digitization system, therefore the structure of product is more simplified compared with the tradition table meter be made up of analog device, the cost control machine of integral product is more reasonable, and cost is more cheap, the use colony of product and applicable surface wider.
Claims (8)
1. an intelligent grid power quality analyzer, it is characterized in that, comprise base plate, for control panel and the display unit of data processing and communication, described control panel comprises analog switched power supply, signal transducer, operational amplifier, A/D conversion chip, control chip and communication module, described analog switched power supply is concatenation operation amplifier respectively, A/D conversion chip, control chip and display unit, the output terminal concatenation operation amplifier of described signal transducer, described operational amplifier is connected with control chip by A/D conversion chip, the output terminal of described control chip is connected with display unit by communication module, described display unit is touch LCD screen,
Signal transducer is by the signal collected by being transferred to control chip after operational amplifier and A/D conversion chip, and control chip shows in real time to transferring data to display unit after signal transacting, realizes on line real-time monitoring;
After device power-up, namely sampling section begins through signal transducer and carries out data acquisition, after operational amplifier and A/D conversion chip by digital data transmission to control chip, start the calculating carrying out data after the data of a control chip collection cycle;
After the page turn over operation of carrying out LCDs, program starts the function judging button: when program judges button operation as entering real time data interface, frequency analysis interface, quality of power supply number interface, LCDs page turning is to the interface of above-mentioned 3 kinds of data display, and then the data simultaneously read required for this data interface to control chip show;
When program judges that button operation is waveform display interface, histogram display interface, the interface that LCDs page turning shows to this figure: at waveform display interface, LCDs reads real-time data point position to control chip, is presented on screen by the waveform of three-phase voltage, three-phase current; When histogram display interface, LCDs reads the data of each harmonic content to control chip, and the data of reference first-harmonic, the size of each harmonic is presented on screen by histogram intuitively with the form of a number percent;
When program judges to need to enter data download interface, LCDs page turning is to this interface: in this interface, user can select the download of current real-time data and the download of a historical data, when user selects real time data to download, by the text document of a generation real time data in USB flash disk, the current real time data calculated is transferred in the real time data text document in USB flash disk by control chip by USB interface;
When user selects the download of historical data, program can according to the date of the data of preserving in storage chip, the text document on corresponding date is generated in USB flash disk, and control chip reads in storage chip the historical data of preserving, and these data to be saved in USB flash disk in corresponding text document according to the date;
When program judges to need to enter optimum configurations interface, LCDs page turning is to this interface, now user needs amendment and parameters according to difference, after click save button, electric energy quality monitor gets back to the display of initial interface, program gets back to the beginning of master routine, restarts the operation of a flow process according to the value of optimum configurations.
2. a kind of intelligent grid power quality analyzer according to claim 1, is characterized in that, described communication module comprises 232 communication chips, 485 communication modules and ethernet communication module.
3. a kind of intelligent grid power quality analyzer according to claim 2, it is characterized in that, described base plate is provided with the connection terminal and ethernet communication interface that connect external sampling, described connection terminal is connecting analog Switching Power Supply and signal transducer respectively, and described ethernet communication interface is connected with remote terminal monitoring equipment by described ethernet communication module.
4. a kind of intelligent grid power quality analyzer according to claim 1, it is characterized in that, also comprise DC/DC converter, this DC/DC switch input is connected with analog switched power supply, output terminal is connected with A/D conversion chip, operational amplifier respectively, the portion voltage that analog switched power supply exports is converted to the normal working voltage of A/D conversion chip, operational amplifier by described DC/DC converter, and described DC/DC converter is isolation voltage regulation type converter.
5. a kind of intelligent grid power quality analyzer according to claim 1, it is characterized in that, described signal transducer comprises voltage transformer (VT) summation current transformer.
6. a kind of intelligent grid power quality analyzer according to claim 1, is characterized in that, described operational amplifier is instrumentation amplifier.
7. a kind of intelligent grid power quality analyzer according to claim 1, is characterized in that, described A/D converter chip is 16 6 passage A/D converter chips.
8. a kind of intelligent grid power quality analyzer according to claim 1, it is characterized in that, described control chip comprises dsp chip and ARM chip, the input end of described dsp chip connects described A/D conversion chip, the output terminal of dsp chip connects ARM chip, described ARM chip is connected with display unit by communication module, described dsp chip is responsible for the collection of digital signal and is converted various digital signal to various power quality data, described ARM chip reads various power quality data from dsp chip, and send data to display unit by communication module.
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| CN103529327B (en) * | 2013-10-23 | 2016-01-06 | 南京灿能电力自动化有限公司 | A kind of full station equipment for monitoring power quality and monitoring method being suitable for Intelligent transformer station |
| CN104698250A (en) * | 2013-12-06 | 2015-06-10 | 展讯通信（上海）有限公司 | Mobile terminal, current decomposing and positioning method and system thereof and current testing device |
| CN103795145A (en) * | 2014-01-21 | 2014-05-14 | 南宁市三华太阳能科技有限公司 | Distributed power supply node real-time monitoring and analyzing system device and analyzing method |
| CN105608877A (en) * | 2016-02-24 | 2016-05-25 | 河南派亚尼尔自动化设备有限公司 | Touch-screen household heat meter collector and application method |
| CN110231563A (en) * | 2019-07-17 | 2019-09-13 | 西安西电开关电气有限公司 | A kind of monitoring device and its monitoring information method for down loading of high-tension switch gear |
| CN110955178A (en) * | 2019-11-26 | 2020-04-03 | 胜业电气股份有限公司 | Electric energy quality intelligent controller based on DSP technology |
| CN117949884B (en) * | 2024-03-26 | 2024-06-11 | 广东电网有限责任公司佛山供电局 | Power quality and voltage monitoring and calibrating method and system based on machine learning |
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