CN102539910A - Intelligent electricity meter capable of analyzing quality of electric energy and method for metering and analyzing quality by using intelligent electricity meter - Google Patents
Intelligent electricity meter capable of analyzing quality of electric energy and method for metering and analyzing quality by using intelligent electricity meter Download PDFInfo
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Abstract
The invention discloses an intelligent electricity meter capable of analyzing quality of electric energy and a method for metering and analyzing quality by using the intelligent electricity meter. The intelligent electricity meter is characterized in that: a voltage transformer (1A) and a current transformer (1B) in a user line are connected with an analog/digital (A/D) converter (3) through a low-pass filter amplifier (2); and an ARM processing chip (4) is connected with an external memory (5) and a liquid crystal display (LCD) (6) of the A/D converter (3) simultaneously. The intelligent electricity meter can analyze the quality of the electric energy provided for the user, provide an electric energy quality state report for the user, timely transmit an early warning signal for protecting the electrical equipment to the user, and provide a basis of pricing by different power quality for the electricity market.
Description
Technical field
The present invention relates to the novel intelligent ammeter of a kind of comprehensive electric energy quality assessment and watt metering.
Background technology
Along with fast development of national economy, increasingly sophisticatedization of power load and variation have the deterioration that impact, load non-linear and uneven characteristic cause the electrical network quality of power supply in a large number.And in a large number based on the application of the micro processor, apparatus of The present computer technology; Make increasing industry show the characteristic of " sensitivity " to the quality of power supply, any disturbance of the quality of power supply is caused all might for these industries to seriously influence and caused tremendous loss.Be to guarantee the safety and stability of electrical network, for the user provides the electric energy of high-quality, must a large amount of input compensation devices; And need what kind of compensation to dispose; Must be foundation with the real-time grid parameter, therefore the intelligent electric meter with power quality analysis function is installed and not only can also quality of power supply detailed account be provided for the user for power department provides quality of power supply real-time parameter at user side; Be convenient to protect consumer, help maintenance customer's rights and interests.
At present, all are the large-scale users that electrical network impacted to easily to the intellectual monitoring of the quality of power supply, for example the Power Quality Detection of railway transformer station is studied also fewer at home and abroad towards the electric energy quality monitoring of domestic consumer.And the quality of power supply relates to voltage; Frequency, many aspects such as power factor, the comprehensive assessment of the quality of power supply need be considered factor in many ways; And its quality directly influence life-span of consumer, so towards the detection of the quality of power supply of domestic consumer and assess power consumer is had great importance.The development of the openingization of electricity market and intelligent power distribution net; Make following power consumer have enough rights of speech to the quality of power supply, the user will have higher requirement to the quality of power supply, and electric energy is the same with other commodity; Must ensure the quality of products; Some developed countries have come into effect many grades quality power supply of electric energy and have chargeed by different prices, and the different quality of power supply is carried out different prices promptly will be become inevitablely by the matter valuation, and be power quality analysis and assessment result by the foundation of matter valuation; Therefore, develop intelligent electric meter wide prospect will be arranged with power quality analysis unit.
Summary of the invention
The object of the invention just provides a kind of intelligent electric meter of analyzing the quality of power supply, and this intelligent electric meter can be analyzed the quality of power supply that offers the user, and quality of power supply status report is provided for the user; Can in time send the early warning signal of protection consumer simultaneously, also can be electricity market the foundation by the matter valuation is provided for the user.
The present invention realizes its goal of the invention, and the technical scheme that is adopted is: a kind of intelligent electric meter of analyzing the quality of power supply, and its composition is:
The voltage transformer (VT) summation current transformer of subscriber's line all links to each other with A/D converter through low-pass filter amplifier; The ARM process chip links to each other with A/D converter external memory storage, LCD display simultaneously.
Effective benefit compared with prior art of the present invention is:
The data collector that the present invention adopted can be gathered real-time voltage, the current signal in the user supply line; Convert digital signal into through filtering again; Can carry out electricity metering and carry out power quality analysis such as harmonic wave by the ARM process chip at last, and finally provide the analysis and assessment result of the quality of power supply.Thereby this ammeter can not only carry out the electricity metering, can also carry out real-time power quality analysis, and can quality of power supply status report be provided for the user; When being lower than setting value with electricity quality, can in time send the early warning signal of protection consumer for the user, the prompting user turn-offs or stops using to the equipment of electricity consumption mass-sensitive, avoids user's consumer to damage or loss of data.Simultaneously, the quality of power supply result who analyzes both can be the reference that Utilities Electric Co. provides harmonic wave control, also can be electricity market the foundation by the matter valuation is provided.
Above-mentioned ARM process chip also links to each other with the gsm communication module.
Like this; Through the gsm communication module, the present invention can realize telex network easily, occurs can in time informing the user fast through gsm module when unusual in the quality of power supply; And can discern the command information that the user returns through the GSM mobile handset note; Make corresponding action according to command information,, help the more convenient energy information that obtains timely of user as responding user's Query Information.
Second goal of the invention of the present invention provides a kind of intelligent electric meter of the above-mentioned quality of power supply analyzed that uses and electric energy measured the method for simultaneously quality of power supply being analyzed.
The present invention realizes that second technical scheme that goal of the invention adopted is: a kind of described intelligent electric meter of analyzing the quality of power supply of claim 1 that uses measures the method for simultaneously quality of power supply being analyzed to electric energy, may further comprise the steps:
A. data pre-service: the voltage transformer (VT) summation current transformer detects real-time voltage, the current signal of power consumer supply line, and is that real-time voltage, current digital signal are sent into the ARM process chip and handled through A/D converter with the sample rate conversion of 6.4ksps again through low-pass filter amplifier filtering and after amplifying;
B. Fourier transform: the real-time voltage that the ARM process chip obtains the A step, current digital signal, obtain the first-harmonic and the each harmonic component of voltage, electric current through discrete Fourier transformation,
C. the metering of electric energy: the voltage that the ARM process chip obtains the B step, the first-harmonic of electric current and each harmonic component carry out discrete integration and obtain current accumulative total electricity and send into LCD display in real time to show, and when the end of month with this month total degrees of ammeters send into external memory stores;
D. quality of power supply event analysis:
The real-time voltage digital signal that the ARM process chip obtains the A step carries out that voltage jumps, voltage die, superpotential quality event analysis, and quality of power supply incident is taken place constantly and the duration is sent into external memory stores;
The fundametal compoment of the voltage that the ARM process chip obtains the B step is carried out the quality event analysis of voltage deviation, frequency departure, and voltage deviation rate, frequency departure rate are sent into external memory stores; The each harmonic of the voltage that the B step is obtained carries out the quality event analysis of percent harmonic distortion, and percent harmonic distortion is sent into external memory stores.
E. the evaluation of comprehensive electric energy quality coefficient: the ARM process chip is by the monitoring time cycle of setting, and each quality of power supply incident that the D step is obtained is carried out weighting and obtained the comprehensive electric energy quality coefficient.
The real-time voltage that obtains with the acquisition rate of 6.4ksps through said method, the intelligent electric meter of the present invention that can make of current digital signal provide the testing result of each quality of power supply event matches national regulation precision easily and fast; The generation moment and the duration of each quality of power supply incident are provided; And draw up to 63 times with the interior frequency analysis result who meets the national regulation analysis precision; Obtain reliable comprehensive electric energy quality coefficient; When improving watt metering information, the electricity consumption quality information is provided also for the user.
The voltage digital signal that above-mentioned ARM process chip obtains the A step carries out that voltage jumps, the specific practice of voltage die, superpotential quality event analysis is: when the real-time voltage effective value that calculates when the real-time voltage digital signal is higher than 1.1～1.8 times of rated voltage effective values and the duration be designated as the voltage incident that jumps more than the power frequency period at 0.5; The real-time voltage effective value that calculates when the real-time voltage digital signal is lower than 0.9 times of rated voltage effective value and is higher than 0.1 times of rated voltage and duration and surpasses 0.5 and promptly be designated as the voltage die incident more than the power frequency period; The real-time voltage effective value that calculates when the real-time voltage digital signal exceeds 1.8 times of rated voltage effective values and duration and surpasses 0.5 power frequency period and be overvoltage event.
The specific practice that the fundametal compoment of the voltage signal that above-mentioned ARM process chip obtains the B step is carried out the quality event analysis of voltage deviation, frequency departure is:
The computing formula of voltage deviation is:
The computing formula of frequency departure is:
The specific practice that the each harmonic of the voltage signal that above-mentioned ARM process chip obtains the B step carries out the quality event analysis of percent harmonic distortion is:
Calculate h subharmonic voltage containing ratio HRU
h,
Calculate total percent harmonic distortion THD again
u,
In the formula, h=2～63, U
h---h subharmonic voltage, U
i---fundamental voltage.
Above-mentioned ARM process chip is by the monitoring time cycle of setting, and each quality of power supply incident that the D step is obtained is carried out the specific practice that weighting obtains the comprehensive electric energy quality coefficient and is:
The comprehensive electric energy quality coefficients R, R=1-[(t1+t2+t3) * i1/T+ Δ U*i2+ Δ f*i3+THD
u* i4];
In the formula, in the monitoring time cycle of T for setting, t1, t2, t3 are respectively and set all voltages in the monitoring time cycle jump summation, the summation of all voltage die incident durations, the summation of all overvoltage event duration of incident duration; I1, i2, i3, i4 are the weighting coefficient of corresponding event, get 0.2-0.3,0.1-0.2,0.3-0.4,0.3-0.4 respectively, and i1+i2+i3+i4=1.
The concrete grammar of these quality of power supply event analysis can simply, fast, comprehensively provide the analysis result of the quality of power supply.
Above-mentioned comprehensive electric energy quality coefficients R is during less than setting value, and the ARM process chip is sent the early warning display message to LCD display, and deposits the early warning display message in external memory storage.
Can remind the user in time to turn-off so easy, fast or inactive consumer, avoid the infringement of subscriber equipment or losing of data to the electricity consumption mass-sensitive.
Below in conjunction with accompanying drawing and specific embodiment the present invention is further explained.
Description of drawings
Fig. 1 is the hardware configuration synoptic diagram of the embodiment of the invention.
Embodiment
Embodiment
Fig. 1 illustrates, and a kind of embodiment of the present invention is, a kind of intelligent electric meter of analyzing the quality of power supply, and its composition is:
The voltage transformer (VT) 1A summation current transformer 1B of subscriber's line all links to each other with A/D converter 3 through low-pass filter amplifier 2; ARM process chip 4 links to each other with A/D converter 3 external memory storages 5, LCD display 7 simultaneously.
ARM process chip 4 also links to each other with gsm communication module 7.
The intelligent electric meter of the quality of power supply analyzed that this routine use is above-mentioned measures the method for simultaneously quality of power supply being analyzed to electric energy, may further comprise the steps:
A. data pre-service: voltage transformer (VT) 1A summation current transformer 1B detects real-time voltage, the current signal of power consumer supply line, and is that real-time voltage, current digital signal are sent into ARM process chip 4 and handled through A/D converter 3 with the sample rate conversion of 6.4ksps again through low-pass filter amplifier 2 filtering and after amplifying;
B. Fourier transform: the real-time voltage that ARM process chip 4 obtains the A step, current digital signal, obtain the first-harmonic and the each harmonic component of voltage, electric current through discrete Fourier transformation,
C. the metering of electric energy: the voltage that 4 pairs of B steps of ARM process chip obtain, the first-harmonic of electric current and each harmonic component carry out discrete integration and obtain current accumulative total electricity and send into LCD display 6 in real time to show, and when the end of month with this month total degrees of ammeters send into external memory stores 5;
Thereby this routine watt-hour meter can show real-time electricity in the middle of the month, the electricity in each month before also transferring.
D. quality of power supply event analysis:
The real-time voltage digital signal that 4 pairs of A steps of ARM process chip obtain carries out that voltage jumps, voltage die, superpotential quality event analysis, and quality of power supply incident is taken place constantly and the duration is sent into external memory stores 5;
The fundametal compoment of the voltage that 4 pairs of B steps of ARM process chip obtain is carried out the quality event analysis of voltage deviation, frequency departure, and voltage deviation rate, frequency departure rate are sent into external memory stores; The each harmonic of the voltage that the B step is obtained carries out the quality event analysis of percent harmonic distortion, and percent harmonic distortion is sent into external memory stores 5.
E. the evaluation of comprehensive electric energy quality coefficient: ARM process chip 4 is by the monitoring time cycle of setting, and each quality of power supply incident that the D step is obtained is carried out weighting and obtained the comprehensive electric energy quality coefficient.
In this routine method, the voltage digital signal that 4 pairs of A steps of ARM process chip obtain carries out that voltage jumps, the specific practice of voltage die, superpotential quality event analysis is: when the real-time voltage effective value that calculates when the real-time voltage digital signal is higher than 1.1～1.8 times of rated voltage effective values and the duration be designated as the voltage incident that jumps more than the power frequency period at 0.5; The real-time voltage effective value that calculates when the real-time voltage digital signal is lower than 0.9 times of rated voltage effective value and is higher than 0.1 times of rated voltage and duration and surpasses 0.5 and promptly be designated as the voltage die incident more than the power frequency period; The real-time voltage effective value that calculates when the real-time voltage digital signal exceeds 1.8 times of rated voltage effective values and duration and surpasses 0.5 power frequency period and be overvoltage event.
In this routine method, the specific practice that the fundametal compoment of the voltage signal that 4 pairs of B steps of ARM process chip obtain is carried out the quality event analysis of voltage deviation, frequency departure is:
The computing formula of voltage deviation is:
The computing formula of frequency departure is:
In this routine method, the specific practice that the each harmonic of the voltage signal that 4 pairs of B steps of ARM process chip obtain carries out the quality event analysis of percent harmonic distortion is:
Calculate h subharmonic voltage containing ratio HRU
h,
Calculate total percent harmonic distortion THD again
u,
In the formula, h=2～63, U
h---h subharmonic voltage, U
i---fundamental voltage.
In this routine method, ARM process chip 4 is by the monitoring time cycle of setting, and each quality of power supply incident that the D step is obtained is carried out the specific practice that weighting obtains the comprehensive electric energy quality coefficient and is:
The comprehensive electric energy quality coefficients R, R=1-[t1+t2+t3*i1/T+ Δ U*i2+ Δ f*i3+THD
u* i4];
In the formula, in the monitoring time cycle of T for setting, t1, t2, t3 are respectively and set all voltages in the monitoring time cycle jump summation, the summation of all voltage die incident durations, the summation of all overvoltage event duration of incident duration; I1, i2, i3, i4 are the weighting coefficient of corresponding event, get 0.2-0.3,0.1-0.2,0.2-0.4,0.3-0.4 respectively, and i1+i2+i3+i4=1.
The monitoring time cycle of setting can be set arbitrarily, is set at 1 minute usually.
In this routine method, said comprehensive electric energy quality coefficients R is during less than setting value, and the ARM process chip is sent the early warning display message to LCD display, and deposits the early warning display message in external memory storage.This early warning information also can in time be sent note to user mobile phone through gsm module.
ARM process chip 4 of the present invention is meant that obtaining Britain ARMAdvanced RISC Machines company authorizes its technology of employing and the little process chip of standard production such as S3C3440, the S3C2410 of Samsung, the XT883 of Motorola Inc. etc.
Method of the present invention can realize in embedded OS through software, or realize with the mode of bare machine program.In embedded OS, realize being convenient to the real-time management of multithreading, multitask.
Below provide the quality of power supply experiment analysis results of this routine intelligent electric meter and method thereof:
Civil power is made an experiment, get i1=0.25 in the test, i2=0.15, i3=0.25, i4=0.35.Detected voltage effective value fluctuates between U=221.1V and U=221.2V, and current effective value fluctuates between I=0.1137A and I=0.1146.Wherein electric power can real-time update, and electricity can correctly add up, and all analytical calculation data can both in time be preserved, and data can not lost after the ammeter power down.In addition, when artificially adding voltage disturbance, the power quality analysis unit can provide the disturbance time, and the record level of disruption.When quality of power supply analysis-by-synthesis coefficients R was lower than setting value 0.85, ammeter can start the note router voluntarily, informed that user's quality of power supply is unusual; When the user passed through note Long-distance Control ammeter, ammeter can be discerned short message content and make corresponding response.
Claims (6)
1. the intelligent electric meter that can analyze the quality of power supply, its composition is:
The voltage transformer (VT) of subscriber's line (1A) summation current transformer (1B) all links to each other with A/D converter (3) through low-pass filter amplifier (2); ARM process chip (4) links to each other with A/D converter (3) external memory storage (5), LCD display (6) simultaneously.
2. a kind of intelligent electric meter of analyzing the quality of power supply as claimed in claim 1 is characterized in that: described ARM process chip (4) also links to each other with gsm communication module (7).
3. one kind is used the described intelligent electric meter of analyzing the quality of power supply of claim 1 that electric energy is measured the method for simultaneously quality of power supply being analyzed, and may further comprise the steps:
A. data pre-service: voltage transformer (VT) (1A) summation current transformer (1B) detects real-time voltage, the current signal of power consumer supply line, and through being that real-time voltage, current digital signal are sent into ARM process chip (4) and handled through A/D converter (3) with the sample rate conversion of 6.4ksps again after low-pass filter amplifier filtering and the amplification;
B. Fourier transform: real-time voltage, current digital signal that ARM process chip (4) obtains the A step, obtain the first-harmonic and the each harmonic component of voltage, electric current through discrete Fourier transformation,
C. the metering of electric energy: the voltage that ARM process chip (4) obtains the B step, the first-harmonic of electric current and each harmonic component carry out discrete integration and obtain current accumulative total electricity and send into LCD display (6) in real time to show, and when the end of month with this month total degrees of ammeters send into external memory stores;
D. quality of power supply event analysis:
The real-time voltage digital signal that ARM process chip (4) obtains the A step carries out that voltage jumps, voltage die, superpotential quality event analysis, and quality of power supply incident is taken place constantly and the duration is sent into external memory stores;
The fundametal compoment of the voltage that ARM process chip (4) obtains the B step is carried out the quality event analysis of voltage deviation, frequency departure, and voltage deviation rate, frequency departure rate are sent into external memory stores; The each harmonic of the voltage that the B step is obtained carries out the quality event analysis of percent harmonic distortion, and percent harmonic distortion is sent into external memory stores.
E. the evaluation of comprehensive electric energy quality coefficient: ARM process chip (4) is by the monitoring time cycle of setting, and each quality of power supply incident that the D step is obtained is carried out weighting and obtained the comprehensive electric energy quality coefficient.
4. according to claim 3 electric energy is measured the method for simultaneously quality of power supply being analyzed, it is characterized in that:
The voltage digital signal that said ARM process chip (4) obtains the A step carries out that voltage jumps, the specific practice of voltage die, superpotential quality event analysis is: when the real-time voltage effective value that calculates when the real-time voltage digital signal is higher than 1.1～1.8 times of rated voltage effective values and the duration be designated as the voltage incident that jumps more than the power frequency period at 0.5; The real-time voltage effective value that calculates when the real-time voltage digital signal is lower than 0.9 times of rated voltage effective value and is higher than 0.1 times of rated voltage and duration and surpasses 0.5 and promptly be designated as the voltage die incident more than the power frequency period; The real-time voltage effective value that calculates when the real-time voltage digital signal exceeds 1.8 times of rated voltage effective values and duration and surpasses 0.5 power frequency period and be overvoltage event.
The specific practice that the fundametal compoment of the voltage signal that said ARM process chip (4) obtains the B step is carried out the quality event analysis of voltage deviation, frequency departure is:
The computing formula of voltage deviation is:
The computing formula of frequency departure is:
The specific practice that the each harmonic of the voltage signal that said ARM process chip (4) obtains the B step carries out the quality event analysis of percent harmonic distortion is:
Calculate h subharmonic voltage containing ratio HRU
h,
Calculate total percent harmonic distortion THD again
u,
In the formula, h=2～63, U
h---h subharmonic voltage, U
i---fundamental voltage.
5. the method for simultaneously quality of power supply being analyzed that electric energy is measured according to claim 4; It is characterized in that: said ARM process chip (4) is by the monitoring time cycle of setting, and each quality of power supply incident that the D step is obtained is carried out the specific practice that weighting obtains the comprehensive electric energy quality coefficient and is:
The comprehensive electric energy quality coefficients R, R=1-[(t1+t2+t3) * i1/T+ Δ U*i2+ Δ f*i3+THD
u* i4];
In the formula, in the monitoring time cycle of T for setting, t1, t2, t3 are respectively and set all voltages in the monitoring time cycle jump summation, the summation of all voltage die incident durations, the summation of all overvoltage event duration of incident duration; I1, i2, i3, i4 are the weighting coefficient of corresponding event, get 0.2-0.3,0.1-0.2,0.3-0.4,0.3-0.4 respectively, and i1+i2+i3+i4=1.
6. the method for simultaneously quality of power supply being analyzed that electric energy is measured according to claim 5; It is characterized in that: said comprehensive electric energy quality coefficients R is during less than setting value; The ARM process chip is sent the early warning display message to LCD display, and deposits the early warning display message in external memory storage.
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| CN110579734B (en) * | 2019-07-29 | 2021-09-21 | 广西电网有限责任公司 | Method for analyzing electric energy quality of single-phase electric energy meter and single-phase electric energy meter |
| CN112098713A (en) * | 2020-07-31 | 2020-12-18 | 宁波三星医疗电气股份有限公司 | Electric energy meter operation control method |
| CN112098713B (en) * | 2020-07-31 | 2022-11-04 | 宁波三星医疗电气股份有限公司 | Electric energy meter operation control method |
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| CN112350285B (en) * | 2020-08-06 | 2023-05-02 | 许继集团有限公司 | Overvoltage protection method suitable for new energy access power grid |
| CN114200381A (en) * | 2021-12-10 | 2022-03-18 | 清湖光旭数据科技(北京)有限公司 | System and method for detecting reliability of intelligent electric meter |
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Application publication date: 20120704 |