CN104931775A - Network multi-functional three-phase electric energy meter possessing electric energy quality analysis function - Google Patents
Network multi-functional three-phase electric energy meter possessing electric energy quality analysis function Download PDFInfo
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- CN104931775A CN104931775A CN201410107799.4A CN201410107799A CN104931775A CN 104931775 A CN104931775 A CN 104931775A CN 201410107799 A CN201410107799 A CN 201410107799A CN 104931775 A CN104931775 A CN 104931775A
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Abstract
The invention relates to a three-phase electric energy meter which possesses electric energy quality analysis and network communication supporting functions. The electric energy meter collects a high-precision voltage and current signal in a high speed mode through a DSP. According to a lot of instantaneous data, a voltage and current waveform of a power supply is accurately restored. Various power supply base parameters are calculated. Another microcontroller is used to carry out quality parameter calculation on the power supply, wherein electric energy quality parameters comprise 50-times voltage (current) harmonics, a power grid frequency deviation, a voltage deviation, a three-phase-voltage unbalanced degree, a voltage fluctuation and flicker, power, a power factor, inter-harmonics (50 times) and the like. The electric energy meter supports Ethernet communication and can conveniently transmit electric energy quality data to an information center. The electric energy meter can be conveniently installed in a large area so that a networked electric energy online monitoring system is formed. Effective monitoring and analysis are performed on electric energy quality of the power grid.
Description
Technical field
The present invention relates to a kind of Multifunctional three-phase electric energy table, especially one has power quality analysis function, and supports the Multifunctional three-phase electric energy table of various network communications mode.
Background technology
Along with socio-economic development, the impacts such as electric railway, electric arc furnaces, frequency converter, non-linear, unbalancedness load are more and more in electric power application, and the power quality problem such as harmonic wave, negative phase-sequence, flickering, voltage transient directly affects the power supply safety of electric system.Electric energy is a kind of commodity, and its quality problems are problems that supplier and client pay close attention to jointly.Electricity consumption enterprise is necessary to set up electric energy quality monitoring system, realizes the real-time monitoring to the whole distrbution network quality of power supply.
In addition, due to the raising of measuring equipment robotization, intelligent level, the networking of multiple stage instrument is applied.The intellectuality of instrument product forward, microminiaturization, networking and virtual direction stride forward rapidly.Development Power Quality Monitoring Technology, must develop the online electric energy quality monitoring product of excellent performance further, set up the networked system of on-line monitoring.Application of the present invention and popularization drop into raising power supply quality, saving power system device, and the operation and management level improving electric system has significant realistic meaning.
Summary of the invention
The object of the invention is for needing high-performance energy monitor, measure and provide a kind of compact multifunction three-phase electric energy meter with electric energy quality monitoring, three-phase electric energy metering and three-phase electricity parameter monitoring with the user of the decision guidance providing the quality of power supply relevant and Performance Evaluation.Make electric power supply business can prepare corrective action in time, and help consumer to prevent the device damage caused by power quality problem.
According to technical scheme provided by the invention, described a kind of network Multifunctional three-phase electric energy table with power quality analysis function comprises: microcontroller, and described microcontroller is connected with dsp processor; Dsp processor connects superhigh precision micro mutual inductor by high-speed A/D converter; Described microcontroller is also connected with FLASH memory, ethernet module, display screen.Described dsp processor carries out high speed acquisition and process by high-speed AD chip to transformer current, voltage data.And calculate the power quality parameters such as 50 voltage (electric current) harmonic waves, mains frequency deviation, voltage deviation, non-equilibrium among three phase voltages, voltage fluctuation and flicker, power, power factor, m-Acetyl chlorophosphonazo (50 times) according to the data gathered; And voltage swells, rapid drawdown, short time voltage interruption are monitored.Described microcontroller is used for carrying out analytic operation to the power quality data that DSP calculates, and is presented on liquid crystal display, is stored in flash storage simultaneously; Described ethernet module can realize network service, sends power quality data to Master Station Software, and its data layout meets the general power quality data Interchange Format (PQDIF) that IEEE Std1159 specifies.
The described superhigh precision mutual inductor linearity is up to 0.05%, and angular difference change is less than 10 points, in the frequency range of 50Hz ~ 2500Hz, have consistent frequency response characteristic.
The calculating of power quality parameter and assessment judgement are followed " GB/T12325-2008 quality of power supply admissible deviation of supply volt-age ", " GB/T14549-93 quality of power supply utility network harmonic wave ", " GB/T12326-2008 quality of power supply voltage fluctuation and flicker ", " GB/T15543-2008 quality of power supply three-phase allows degree of unbalancedness ", six quality of power supply national standards such as " GB/T15945-2008 quality of power supply power system frequency deviation " and " GB/T18481-2001 quality of power supply temporary overvoltage and instantaneous overvoltage ".
Adopt harmonic wave and the m-Acetyl chlorophosphonazo of wavelet transformation Measurement and analysis non-stationary time varying signal (actual power distribution network alternating current), adopt neural network algorithm calculating voltage flicker envelope signal.
Advantage of the present invention is: have the ability measured and analyze 50 subharmonic, has composite measurement, analysis, the arbitration functions such as measuring voltage fluctuation and flickering, voltage deviation, tri-phase unbalance factor simultaneously; Have network communicating function, communication protocol meets international standard IEEE Std1159; This device can large area be installed easily, forms the Electric Power Quality On-line Monitor System of networking, carries out effective supervision and analysis to the quality of power supply of electrical network.
Accompanying drawing explanation
Fig. 1 is circuit structure block diagram of the present invention.
Fig. 2 is main program flow chart of the present invention.
Fig. 3 is Harmonics Calculation process flow diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.As shown in Figure 1, the present invention includes microcontroller, dsp processor, flash storage, 16 high-speed AD chips, superhigh precision Micro-Transformer of Voltage PT, superhigh precision micro-transformer of current CT, ethernet interface module, LCD MODULE and input keyboards.Three-phase alternating current is transformed into measurable low-voltage and small area analysis signal through superhigh precision micro mutual inductor, and voltage and current signal is converted to digital signal by high-speed AD chip.Dsp processor carries out high speed processing and computing to electric current and voltage digital signal, and operation result is kept in the buffer memory of DSP.Microcontroller obtains the data after DSP process by parallel bus, and the quality of power supply characterization parameter after DSP computing, is kept in flash storage.Simultaneously according to the data obtained and the corresponding content of driving parameter LCD liquid crystal display.Ethernet module is connected with microcontroller by serial port, and microcontroller on Ethernet by model calling, is received and sends data.
Be illustrated in figure 2 the workflow diagram of system master routine, the initialization of main finishing equipment and Decision Control function.Carry out the initialization of software and hardware and data after system electrification, then the power quality data in DSP buffer memory is read in timing.After reading, computational analysis is carried out to data, carries out reporting to the police according to result, shows, logout; Power quality data is saved in flash storage in chronological order simultaneously.Master routine also needs to respond the communication request of Ethernet interface and process input through keyboard.By Ethernet interface, power quality data is sent to the main website of system.
Being illustrated in figure 3 Harmonics Calculation flow process, first quick Fourier transformation computation being carried out to harmonic source signal x (t), carrying out frequency search, to determine scale parameter m, n of harmonic wavelet to converting the result X (ω) obtained.And then determine time harmonic wavelet function, then time harmonic wavelet function is carried out quick Fourier transformation computation, its result is multiplied with X (ω), then to the result W (m that it is multiplied, n, ω) carry out invert fast fourier transformation computing, by wavelet coefficient W (m, n to time domain, t) be reconstructed, obtain the instantaneous value of each harmonic and m-Acetyl chlorophosphonazo, finally utilize least square method to carry out matching to each frequency component, obtain the result of Harmonic Wavelet Analysis.
Line voltage current signal is transformed into small-signal by design proportion by the superhigh precision micro mutual inductor that device is built-in by the present invention, converts electric current and voltage analog signals to digital signal by high-speed AD chip.Then utilize DSP to gather electric current and voltage digital quantity, digital filtering is carried out to data, obtains reliable electric current and voltage real time data.Microcontroller reads the electric current and voltage real time data in DSP buffer memory by parallel bus, carry out the power quality parameters such as harmonic wave, flickering, voltage deviation, mains frequency deviation, tri-phase unbalance factor, power factor, electricity to calculate, result of calculation is added that time marking is kept in flash storage simultaneously.According to result of calculation, the LCD of drive unit shows the data such as electricity, power factor, voltage, frequency departure, flickering.This device can also send the electric energy metricals such as electricity, voltage, electric current, power, harmonic wave and qualitative data to main website by Ethernet interface.
Below provide a specific embodiment.
Adopt the low cost superhigh precision micro mutual inductor of the up-to-date research and development of Beijing Huo Yuan science and technology, the linearity is up to 0.05%, and angular difference change is less than 10 points, in the frequency range of 50Hz-2500Hz, have consistent frequency response characteristic.Make input signal and measuring system Secure isolation, antijamming capability and the security of device can be improved.Adopt 32 bit DSP+CortexM3ARM kernels, application embedded OS platform.Adopt 16 8 passage high-speed synchronous sampling A/D converters, sample frequency reaches 25.6KHz.Quick and precisely, function is strong, and level of integrated system is higher, good stability for data processing.Adopt 4G high-capacity FLASH to store, in units of 5 minutes, store data, the power quality data information of 2 years can be preserved.Power quality data stores and read-write: meet the general power quality data Interchange Format (PQDIF) that IEEE Std1159 specifies, data have good compatibility, are convenient to realize the data sharing between different monitoring system.Adopt 320 × 240 Dot-Matric LCD Display real time datas, by unit panel keyboard, on-the-spotly can inquire about all monitored parameters and display waveform, vector plot, conveniently systematic parameter can be set.
Contents for Monitoring: 50 voltage (electric current) harmonic waves, mains frequency deviation, voltage deviation, non-equilibrium among three phase voltages, voltage fluctuation and flicker, power, power factor, m-Acetyl chlorophosphonazo (50 times), voltage swells, rapid drawdown, short time voltage interruption, event record ripples etc.Statistical function: device has the Online statistics function to main monitoring index, can add up the maximal value of monitoring index in the time period, minimum value, mean value, the large value of 95% probability etc.Communication protocol is compatible with " intelligent electric energy meter " and " power user power consumption information acquisition system " series standard.Set up that memory capacity is large, real-time update ability strong, it is convenient to browse and can realize the electrical energy monitoring system of the functional requirements such as high-speed data-flow, data base administration, data sharing.Meet each Real-Time Monitoring website in electrical network and be linked to be entirety, realize the networking needs of quality of power supply on-line monitoring.
Claims (6)
1. there is the network Multifunctional three-phase electric energy table of power quality analysis function, comprise microcontroller, it is characterized in that: described microcontroller is connected with dsp processor, dsp processor is by high-speed AD acquisition voltage and current signal, and described microcontroller also connects FLASH and ethernet module, LCDs and button inputting circuits;
Described dsp processor gathers high-accuracy voltage current signal by high-speed AD chip, and be converted into the basic data of power quality accordingly, then various power quality parameters is obtained by the further calculating of described microcontroller, and be saved in FLASH memory, be simultaneously displayed in LCD display, also can send data to information center by ethernet module.
2. there is the network Multifunctional three-phase electric energy table of power quality analysis function as claimed in claim 1, it is characterized in that the dsp processor that arithmetic speed is exceedingly fast comes high precision instantaneous voltage, current signal for acquisition process ultra high speed A/D conversion, these data can the basic condition of reduction power supply.
3. there is the network Multifunctional three-phase electric energy table of power quality analysis function as claimed in claim 1, it is characterized in that microcontroller is to the further calculation process of power data, obtain the power quality parameters such as 50 voltage (electric current) harmonic waves, mains frequency deviation, voltage deviation, non-equilibrium among three phase voltages, voltage fluctuation and flicker, power, power factor, m-Acetyl chlorophosphonazo (50 times).
4. have the network Multifunctional three-phase electric energy table of power quality analysis function as claimed in claim 1, it is characterized in that the electrical energy parameter that can store 3 years in FLASH memory, these parameters are before storing by formulism process.
5. the storage of high precision electrical energy parameter is processed by formulism as claimed in claim 4, it is characterized in that discrete data formula to represent, 50 subharmonic, 50 sinusoidal wave formula represent; Mains frequency skew is record-shifted value, and logout is represented by Case Number, instead of word or data describe.
6. have the network Multifunctional three-phase electric energy table of power quality analysis function as claimed in claim 1, it is characterized in that supporting ethernet communication, agreement meets the standard of International Power Electronic Engineering Association.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105353208A (en) * | 2015-11-13 | 2016-02-24 | 国网江西省电力科学研究院 | Electric energy metering and monitoring device for photovoltaic power generation |
| CN105445546A (en) * | 2015-12-31 | 2016-03-30 | 杭州海兴电力科技股份有限公司 | Fiber access type electric energy meter with function of harmonic detection |
| CN106405477A (en) * | 2016-10-13 | 2017-02-15 | 国网冀北电力有限公司电力科学研究院 | Evaluation method and device for metering performance under dynamic load |
| CN106443173A (en) * | 2016-10-20 | 2017-02-22 | 云南电网有限责任公司电力科学研究院 | Micro-grid online monitoring device and electric quantity metering method thereof |
| CN107202930A (en) * | 2017-07-11 | 2017-09-26 | 天津市万贸科技有限公司 | A kind of quality of power supply on-line monitoring method and device |
| CN112858779A (en) * | 2021-01-20 | 2021-05-28 | 国网浙江省电力有限公司营销服务中心 | Metering method and system for medium and low voltage direct current transmission system |
| CN113466550A (en) * | 2021-08-11 | 2021-10-01 | 国网山西省电力公司 | an electric energy meter |
| CN113759166A (en) * | 2021-09-09 | 2021-12-07 | 林永成 | Method for detecting power factor in electric power system |
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2014
- 2014-03-21 CN CN201410107799.4A patent/CN104931775A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105353208A (en) * | 2015-11-13 | 2016-02-24 | 国网江西省电力科学研究院 | Electric energy metering and monitoring device for photovoltaic power generation |
| CN105445546A (en) * | 2015-12-31 | 2016-03-30 | 杭州海兴电力科技股份有限公司 | Fiber access type electric energy meter with function of harmonic detection |
| CN105445546B (en) * | 2015-12-31 | 2018-08-21 | 杭州海兴电力科技股份有限公司 | A kind of intelligent acess formula electric energy meter with harmonic detection function |
| CN106405477A (en) * | 2016-10-13 | 2017-02-15 | 国网冀北电力有限公司电力科学研究院 | Evaluation method and device for metering performance under dynamic load |
| CN106405477B (en) * | 2016-10-13 | 2023-11-24 | 国网冀北电力有限公司电力科学研究院 | Method and device for evaluating measurement performance under dynamic load |
| CN106443173B (en) * | 2016-10-20 | 2023-09-01 | 云南电网有限责任公司电力科学研究院 | Micro-grid online monitoring device and electric quantity metering method thereof |
| CN106443173A (en) * | 2016-10-20 | 2017-02-22 | 云南电网有限责任公司电力科学研究院 | Micro-grid online monitoring device and electric quantity metering method thereof |
| CN107202930A (en) * | 2017-07-11 | 2017-09-26 | 天津市万贸科技有限公司 | A kind of quality of power supply on-line monitoring method and device |
| CN112858779A (en) * | 2021-01-20 | 2021-05-28 | 国网浙江省电力有限公司营销服务中心 | Metering method and system for medium and low voltage direct current transmission system |
| CN112858779B (en) * | 2021-01-20 | 2022-05-20 | 国网浙江省电力有限公司营销服务中心 | A metering method and system for a medium and low voltage direct current transmission system |
| CN113466550A (en) * | 2021-08-11 | 2021-10-01 | 国网山西省电力公司 | an electric energy meter |
| CN113759166A (en) * | 2021-09-09 | 2021-12-07 | 林永成 | Method for detecting power factor in electric power system |
| CN113759166B (en) * | 2021-09-09 | 2024-01-05 | 林永成 | Method for detecting power factor in power system |
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Application publication date: 20150923 |