CN104076321A - On-line monitoring and evaluating system and method for digital electric energy meter - Google Patents

On-line monitoring and evaluating system and method for digital electric energy meter Download PDF

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CN104076321A
CN104076321A CN201410321322.6A CN201410321322A CN104076321A CN 104076321 A CN104076321 A CN 104076321A CN 201410321322 A CN201410321322 A CN 201410321322A CN 104076321 A CN104076321 A CN 104076321A
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phase
electric energy
voltage
digital electric
current
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CN201410321322.6A
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CN104076321B (en
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张秋雁
余倩
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贵州电力试验研究院
华中科技大学
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Abstract

The invention provides an on-line monitoring and evaluating system and method for a digital electric energy meter, and belongs to the technical field of electric energy measurement and test. The on-line monitoring and evaluating system comprises a merging unit, a switcher, an RS485 concentrator, a far-end computer, a data transmission unit and a local computer. The digital electric energy meter in actual running is monitored on line for a long time, sensitive factors affecting measurement errors and reliability of the event recording function of the digital electric energy meter are found out, a state evaluation model of a digital electric energy measurement system is set up, and application of new electric energy measurement devices such as an electronic mutual inductor and the digital electric energy meter to the digital substation electric energy measurement system is promoted.

Description

A kind of digital electric energy meter on-line monitoring and evaluating system and method

Technical field

The invention belongs to electric energy metrical technical field of measurement and test, more specifically, relate to a kind of digital electric energy meter on-line monitoring and evaluating system and method.

Background technology

Along with the propelling day by day of electric power digitalization development, the digitized measurement system obtains applying more and more widely.As the important component part of the digitized measurement system, the demand of digital electric energy meter is also increasing.The input signal of digital electric energy meter is by electronic current, voltage transformer (VT) collection and transfer to merge cells, meet the complete digital signal of IEC61850-9-1 or IEC61850-9-2 communication protocol.Digital electric energy meter carries out logical operation to electric current, the voltage digital signal of input, and its active energy metering does not have error in theory.But in fact, due to factor impacts such as sampling precision, processor word size and time synchronized, error certainly exists.In actual motion which factor large on the error in dipping impact of digital electric energy meter, run into extreme operating condition such as a large amount of higher hamonic wave situations under digital electric energy meter whether can also normally work, the problems such as reliability of the anomalous event writing task of digital electric energy meter, be all the object that need to study.Digital electric energy meter is at present still in developing stage, and its calibration method, transmission of quantity value, error judgment and reliability etc. also do not have unified standard, and this has brought very large obstruction to development and the large-scale application of digital electric energy meter.

Not yet announce at present national standard and the vertification regulation of digital electric energy meter, and existing research is all the field-checking for digital electric energy meter, do not mention long-term, the online Real-Time Monitoring of digital electric energy meter duty and assessment, for example, in patent < < digital quantity input type electric energy meter on-line calibration device > > that application number is 201210545604.5, mention the on-line testing method and apparatus to digital electric energy meter.And current research is mainly the detection of the error in dipping of specific aim digital electric energy meter, for example, in patent < < digital electricity meter accuracy evaluation system that application number is 201210447903.5 and method > > thereof, introduced and a kind ofly can carry out to digital electric energy meter the method for on-the-spot test, can also analog message frame losing, the abnormality such as network storm, detect the shunt running of digital electric energy meter, start and harmonic effects amount, but do not pay close attention to the anomalous event writing function of digital electric energy meter.In " digital electric energy meter specific (special) requirements ", clearly regulation digital electric energy meter should possess electrical network anomalous event writing function.

Summary of the invention

For above-mentioned technical matters, the object of the present invention is to provide the system of a kind of digital electric energy meter on-line monitoring and assessment, the digital electric energy meter of actual motion is carried out to on-line monitoring.By data analysis and contrast, the monitoring error in dipping of digital electric energy meter and the reliability of event recording function.

The invention provides a kind of digital electric energy meter on-line monitoring and evaluating system, comprising:

Merge cells: for transmitting data by described switch to a plurality of digital electric energy meters and described far-end computer, wherein said data comprise voltage digital signal and current digital signal;

Switch: the data of a certain port output of described merge cells are converted to multichannel data, and export respectively described multichannel data to described a plurality of digital electric energy meter and described far-end computer;

RS485 hub: collect the energy value of described a plurality of digital electric energy meter metering and anomalous event recording and sending to described far-end computer;

Far-end computer: receive described data from described switch, by FFT, convert and resolve voltage, current value and be sent to described local computer, and analyze and whether electrical network anomalous event occurs and store described electrical network anomalous event, described energy value and the described anomalous event of also from described RS485 hub, obtaining described a plurality of digital electric energy meter meterings record and store;

Data transmission unit: the described energy value of the voltage after the described parsing in described far-end computer, current value, described electrical network anomalous event, described a plurality of digital electric energy meter meterings and described anomalous event record are sent back to described local computer by communication network; And

Local computer: calculate electric energy value according to the voltage after the described parsing of passing back in described far-end computer, current value, in each metering cycle, the described energy value of the described electric energy value calculating and described a plurality of digital electric energy meter meterings is once compared, analyze the long-term on-line operation error in dipping of described a plurality of digital electric energy meters; Also according to the described electrical network anomalous event of passing back in described far-end computer, compare with the described electrical network anomalous event record of described a plurality of digital electric power table records respectively, analyze the reliability of the long-term on-line operation event recording function of described a plurality of digital electric energy meters.

The present invention also provides a kind of digital electric energy meter on-line monitoring and appraisal procedure, comprising:

Step 1 is converted to multichannel data by the data of a certain port output of merge cells by switch, and transfers to respectively far-end computer and a plurality of digital electric energy meter;

Described in step 2, far-end computer carries out FFT conversion to the described data of obtaining, and obtains harmonic voltage, current amplitude and phase differential, and is sent to described local computer;

Described in step 3, far-end computer reads the electric energy value that described a plurality of digital electric energy meter regularly freezes and sends to described local computer in each metering cycle, the electrical network anomalous event that also reads described a plurality of digital electric energy meters records number, if described, record number and change, the anomalous event that reads corresponding digital electric energy meter according to abnormality code records and stores;

Described local computer passed back in the electric energy value that step 4 data transmission unit regularly freezes the harmonic voltage after the described parsing in described far-end computer, current amplitude, described phase differential, described a plurality of digital electric energy meters by transmission network and described anomalous event record, described local computer calculates electric energy value according to the harmonic voltage after the described parsing of passing back, current amplitude, and contrast with the electric energy value of described a plurality of digital electric energy meters of the same time point freezing, calculate the error in dipping of described a plurality of digital electric energy meters;

Described in step 5, whether local computer there is electrical network anomalous event according to harmonic voltage, current amplitude and described phase differential analysis after the described parsing of passing back, and contrast with the anomalous event record of described a plurality of digital electric energy meters, judge the reliability of the electrical network anomalous event writing function of described a plurality of digital electric energy meters.

In general, the above technical scheme of conceiving by the present invention compared with prior art, has following beneficial effect:

The present invention, by data analysis and contrast, finds out the influence factor to the error in dipping sensitivity of digital electric energy meter, the appearance as early as possible of promotion digital electric energy meter relevant criterion and perfect;

Each digital electric energy meter to be assessed is set and regularly freezes, take and guarantee the data that data that each digital electric energy meter is passed back are same time point, avoid return data due to the error that asynchronism(-nization) step causes, improved error in dipping examination precision of the present invention;

Local computer is analyzed electric current, the voltage data after far-end computer FFT resolves, judge whether to occur anomalous event, then contrast with the abnormal events of digital electric power table record, analyze the reliability of digital electric energy meter anomalous event record, promote the application of electric energy metrical new equipment in digital transformer substation electric energy metrical system such as electronic mutual inductor and digital electric energy meter, the day-to-day operation that effectively solves digital transformer substation electric energy measuring equipment safeguards and electric energy metrical long-term accuracy, integrity problem.

Accompanying drawing explanation

Fig. 1 is digital electric energy meter on-line monitoring of the present invention and evaluating system structural representation.

Embodiment

In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.In addition,, in each embodiment of described the present invention, involved technical characterictic just can not combine mutually as long as do not form each other conflict.

Figure 1 shows that digital electric energy meter on-line monitoring of the present invention and evaluating system structural representation.As shown in Figure 1, digital electric energy meter on-line monitoring and evaluating system comprise merge cells, switch, far-end computer, RS485 hub, data transmission unit and local computer.From a certain FPDP of merge cells, read the data that meet IEC61850-9-1 or IEC61850-9-2 standard, then by switch, the data that read are converted to multichannel data and input to far-end computer and a plurality of digital electric energy meter to be assessed.Each digital electric energy meter respectively self is counted electric energy data by RS485 port, spread out of, the data fit DLT645-2007 stipulations that spread out of, import the continuous data of a plurality of digital electric energy meters into far-end computer by RS485 hub.Far-end computer is sent to data transmission unit by serial ports by the continuous data of a plurality of digital electric energy meters that receive, and data transmission unit is converted to serial data IP data and for example, is sent to local computer by communication network (GPRS).

Far-end computer is from switch obtains merge cells data, IEC61850-9-1 or IEC61850-9-2 Frame are unpacked, do a FFT conversion every 1 second, to 4000 some data, (data frequency that general merge cells sends is 80 points of each cycle, China's electric system is 50hz, a cycle is 0.02 second, in 1 second, have 50 cycles) do FFT conversion, by FFT, convert electric current, voltage magnitude and the phase differential that obtains 1 to 13 subharmonic, and pass result of calculation back local computer by data transmission unit.In embodiments of the present invention, can meet accuracy requirement 1 second, if the time of getting is oversize, sampled point is too much, causes calculating very slow; If the time of getting is too short, very little, precision does not meet sampled point.

The present invention adopts the mode of far-end computer and local computer combination, and far-end computer is mainly reading power meters data and merge cells data, carries out in real time passing local computer back after FFT conversion.Local computer is analyzed FFT data, judges whether to occur electrical network anomalous event, the electric energy meter anomalous event contrast of passing back with far-end computer, and calculate electric energy value, the electric energy value comparison obtaining with electric energy meter meter.The Main Function of far-end computer is image data, data back local analytics can be reduced to the workload of far-end computer, improves real-time, and is beneficial to jumbo data storage.

The voltage that local computer is passed back according to data transmission unit, electric current, phase difference calculating electric flux, carry out an electric weight for every 22 hours and add up.

In embodiments of the present invention, digital electric energy meter for 0.2S level, in < < DLT645-2007 multifunctional electric energy meter communication protocol > >, regulation digital electric energy meter shows that in energy data, lowest order is 0.01kWh, the error causing due to registration precision is 0.0099kWh to the maximum, approximates 0.01kW.H is known according to theory of errors, when error is directional error time can ignore (error that directional error is electric energy meter, for the table of 0.2S level, specification error is no more than 0.2%), digital electric energy meter is minimum will measure be 15kWh, when metering 15kWh electric weight, the error causing due to registration precision meets the demands.If calculate with rated voltage 57.7V, rated current 5A, 80% load, need the time be within minimum 21.66 hours, to read one time electric energy meter data, in the present invention in order to improve the effect of error analysis, get minimum value and within 22 hours, read a digital electric energy meter energy data and carry out error analysis.

Generally, the method for calculating electric flux has dot product and converts two kinds of major ways with FFT, and dot product is relative simple with calculating, but cannot overcome the problem of DC maladjustment.

In traditional electric energy meter design proposal, conventionally adopt low-pass filter to remove DC component, but this mode relate to hardware, can increase cost and product power consumption, volume.And require 0 hertz in stopband, 50 hertz for passband, the frequency characteristic of wave filter is had relatively high expectations; And the fundametal compoment that requires 50 hertz is undistorted passes through, the ratio of damping of wave filter and quality factor are also had relatively high expectations.

If adopt merely fft algorithm to calculate electric flux, algorithm complexity is high to hardware requirement, and inevitably can produce frequency leakage problem, affects measuring accuracy.Special when non-synchronous sampling problem appears in merge cells, error is larger.Under simulated environment, in sample frequency, be 49.5 hertz, when electric current, voltage are 50 hertz, FFT non-synchronous sampling electric current, voltage relative error can reach 25% left and right.

In embodiments of the present invention, adopt dot product and calculate electric energy value with the method for FFT conversion combination.

Far-end computer, from switch obtains data, unpacks IEC61850-9-1 or IEC61850-9-2 Frame, does a FFT conversion every 1 second, converts the voltage magnitude V that obtains DC component by FFT os, current amplitude I os.From electric current, voltage signal, deduct after DC component value, recycling dot product and mode are calculated electric flux.Electric energy value W per second sbe calculated as follows:

W s = &Sigma; i = 1 4000 ( I i - I os ) &times; ( V i - V os ) &times; 1 4000

Wherein, I i, V ithe electric current, the magnitude of voltage that represent respectively i point, i=1,2 ..., 4000.

Within every 22 hours, read once total electric weight, be about to charge value per second in 22 hours and add up, the total electric weight W that obtains 22 hours is:

W = &Sigma; i = 1 79200 W si

Far-end computer reads every 22 hours active request the meritorious total electric energy of combination the storage that each digital electric energy meter measures.

Digital electric energy meter can not be by RS485 interface regularly initiatively to computing machine reported data, and therefore in existing method, the general mode of automatic regular polling that adopts gathers the real-time electric quantity data of digital electric energy meter.Computing machine sends and reads real time data order to each digital electric energy meter to be assessed respectively, and digital electric energy meter receives order backcasting machine returning real-time data.But this polling method cannot guarantee the synchronism of return data.The time receiving orders due to each digital electric energy meter may be inconsistent, and the reaction time of each producer's digital electric energy meter may be not identical yet, and what cause transmitting back is the data of different time points, thereby brings error to monitoring system.The error estimation causing because return data is asynchronous is analyzed as follows:

When in DLT645/2007 agreement, the each communication of regulation starts, Dou Shiyou main website sends request command frame to the slave station of selecting by message frame address territory, and requested slave station responds after receiving command frame.Command frame is generally 26 bytes, response frame be generally 22 bytes (in DLT645/2007 agreement Frame the longest be 22 bytes, main website is before transmission information, first send the lead byte of 4 bytes to wake take over party up), 11 of each bytes, the electric energy meter response time delay Td:20ms≤Td≤500ms after frame that receives orders.Main website sends the 500ms that pauses between every byte, receives data without pause.By bit rate, be that 9600bps calculates, from computing machine, send read data command frame and to digital electric energy meter, receive and return a frame energy data required time t and be:

t min = ( 26 &times; 11 9600 &times; 1000 + 25 &times; 500 + 20 + 20 &times; 11 9600 &times; 1000 ) ms &ap; 12.58 s

t max = ( 26 &times; 11 9600 &times; 1000 + 25 &times; 500 + 500 + 20 &times; 11 9600 &times; 1000 ) ms &ap; 13.06 s

Therefore, adopt polling method to read the real time data of digital electric energy meter, between every table, at least produce the error of 12.58s.If there is N piece digital electric energy meter to be assessed, the error causing because the reading duration is asynchronous between first and N piece can reach 12.58Ns.If within 24 hours, read the electric quantity data of a digital electric energy meter, the electric weight error between first and N piece digital electric energy meter is:

12.58 N 24 &times; 3600 &ap; 0.015 N %

For the digital electric energy meter of 0.2S level, relative error maximum must not surpass 0.2%.In theory of errors, stipulate, the error of normal component can account for 1/3 to 1/10 of error, therefore can think the error causing when the time is asynchronous be no more than digital electric energy meter total error 0.2% 1/3 to 1/10 time, can ignore.Have:

0.02%≤0.015N%≤0.067%

1.33≤N≤4.46

N round numbers,, when digital electric energy meter number to be assessed is more than or equal to 5, just there will be error to exceed standard.And above-mentioned time t is the fastest time under communication non-failure conditions, causes data re-transmission if communication is broken down, t increases, and N reduces.

For addressing the above problem, each digital electric energy meter to be assessed is set in the present invention and regularly freezes, every 22 hours, freeze once current electric energy value, after freezing, the electric energy value of this time point is stored in electric energy meter.When far-end computer sends reading order to digital electric energy meter, each digital electric energy meter spreads out of by RS485 port the electric energy value freezing.Digital electric energy meter can freeze repeatedly data depending on its storage size, and can get for outer counter is re-reading.Employing is read the method for freezing data and has been avoided causing because of the time delay of poll the asynchronous problem of data of obtaining, assurance by all digital electric energy meters to be assessed in the same time continuous data compare, improved the error in dipping examination precision of this programme.Far-end computer sends and reads freezing data order to each digital electric energy meter to be assessed, take and guarantees the data that data that each digital electric energy meter is passed back are same time point.

Synchronous for guaranteeing the internal clocking of the digital electric energy meter that each is to be assessed, system to be to be as the criterion computer time, when every day, 24:00 once broadcasted school to all monitored digital electric energy meters, and the error causing with control system asynchronism(-nization) step.The time in-synchronization error of the technical program is analyzed as follows:

If the algorithm routine of computing machine in one-period T, count electric weight be w d, the electric weight that the monitored digital electric energy meter meter of k piece obtains is w k(k=1,2 ... n, n is the sum of monitored digital electric energy meter), the clock difference of the clock of the digital electric energy meter that k piece is monitored and computing machine is Δ t k(T.T. is poor is t my god, the Δ t here krefer to the monitored clock of digital electric energy meter and the clock difference of computing machine of k piece in cycle T, in advance Δ t kfor on the occasion of, Δ t lags behind kfor negative value).In each cycle T, the actual metered time of the monitored digital electric energy meter of k piece is T+ Δ t k, establishing the relative error of bringing due to asynchronism(-nization) step is ε k:

&epsiv; k = w k T + &Delta;t k &CenterDot; &Delta; t k w d = w k w d &CenterDot; &Delta;t k T + &Delta;t k - - - ( 1 )

By following two kinds of situations, carry out asynchronous error analysis time:

If the T.T. of the clock of digital electric energy meter and the clock of computing machine differs from for t in 1 one days my god, (t my godcan calculate by the reading power meters time before every day is during school), establish poor t of T.T. my godin one day, be equally distributed, have:

According to DL/T614-2007 regulation, the error of time of day of electric energy meter can not surpass 0.5s/d, by (8), knows t my god≤ 0.5s, by computational data communication transfer required time, is made as 22 hours by T, Δ t k=0.46s, knows according to formula (1):

&epsiv; k = w k w d ( 0.46 22 &times; 3600 + 0.46 ) &ap; w k w d &times; 5.8 &times; 10 - 6 - - - ( 2 )

If there is extreme case Δ t in 2 hypothesis k=t my god, the mistiming t of ammeter in a day my godappear at a T of ammeter in the cycle, i.e. Δ t k=0.5S, is known by formula (1):

&epsiv; k = w k w d &CenterDot; &Delta;t k T + &Delta;t k = w k w d ( 0.5 22 &times; 3600 + 0.5 ) = w k w d &times; 6.4 &times; 10 - 6 - - - ( 3 )

Known according to theory of errors, when error is directional error in time, can be ignored.0.2S stages of digital formula electrical energy meter accuracy is 0.2%, 0.2% be 0.066%~0.02%, due to generally, in 1 left and right, the result that above-mentioned formula (2) and formula (3) are calculated is much smaller than 0.066%~0.02%.In sum, in the present invention, adopt regularly and read digital electric energy meter freezing data, the error in dipping that between computing machine and digital electric energy meter, asynchronism(-nization) step causes is negligible.

Merge cells transfers to far-end computer by electric current, voltage to meet the digital frame form of IEC61850-9-1 or IEC61850-9-2 communication protocol by Ethernet interface, far-end computer converts analytic message by FFT, draws the amplitude of electric current, voltage and electric current, voltage-phase difference.

In embodiments of the present invention, far-end computer (be take 2 minutes as example) at set intervals and is read the specific data sign content of digital electric energy meter output, obtains digital electric energy meter electrical network anomalous event and records number (according to DL/T645-2007 agreement).If record number, change, then the anomalous event that reads digital electric energy meter records and stores.Electric current, voltage data by local computer analysis after far-end computer FFT resolves, judge whether to occur electrical network anomalous event, and when which type of electrical network anomalous event occurred.The Data Identification content of reading digital electric energy meter is a process of checking, if noted abnormalities there is variation in logout number, explanation digital electric power table record in these 2 minutes is crossed an electrical network abnormal data, according to corresponding Data Identification, remove to read this anomalous event record again, in the record of digital electric energy meter, can show it is when which type of anomalous event occurred, then the electrical network anomalous event with local computer analysis of the anomalous event record of digital electric energy meter be contrasted.

In embodiments of the present invention, when there is following situation, think electrical network generation anomalous event, local computer recording events occurs, the end time; Event starts, the finish time electric weight; And anomalous event type.

(1) A, B, C phase decompression

In three-phase (or single-phase) electric power system, certain phase load electric current is greater than starting current (0.5%Ib), but the voltage of voltage circuit lower than digital electric energy meter normal working voltage 78% time (78%Un), and the duration be greater than 1 minute.

(2) A, B, C is mutually under-voltage, A, B, the overvoltage of C phase

In three-phase (or single-phase) electric power system, the voltage of certain phase voltage circuit lower than normal working voltage 220V or 380V (being as the criterion with electric energy meter nameplate parameter to be assessed) 5% or higher than 5%.

(3) full decompression

If three-phase voltage is all lower than the critical voltage of digital electric energy meter (reference voltage lower limit 60%), and load current is greater than the state of 5% fundamental current (5%Ib).

(4) A, B, C phase defluidization

In three-phase power supply system, three-phase has voltage to be greater than the critical voltage of digital electric energy meter, and in three-phase current, arbitrary phase or two-phase are less than starting current, and other phase line load currents are greater than the state of 5% fundamental current.

(5) A, B, C disconnected phase mutually

In three-phase power supply system, certain occurs that voltage is lower than the critical voltage of digital electric energy meter mutually, and load current is less than the state that the starting current time surpasses 60 seconds simultaneously.

(6) A, B, C stop mutually

In three-phase power supply system, certain occurs that voltage is lower than the critical voltage of digital electric energy meter mutually, and load current is less than the state that the starting current time surpasses 60 seconds simultaneously.

(7) Voltage unbalance rate is not more than 30%

Voltage unbalance rate=((maximal phase voltage-minimum phase voltage)/maximal phase voltage) * 100%.

(8) current imbalance

Current imbalance rate=((maximum phase current-minimum phase current)/maximum phase current) * 100%.

(9) voltage negative phase sequence

The leading A phase of C phase voltage, A mutually leading B phase, B mutually leading C be positive phase sequence mutually, otherwise be negative phase sequence.

(10) electric current negative phase sequence

The leading A phase of C phase current, A mutually leading B phase, B mutually leading C be positive phase sequence mutually, otherwise be negative phase sequence.

Table 1 is depicted as the record data identification code table of digital electric energy meter electrical network anomalous event.

Event Data Identification Event Data Identification A, B, C phase decompression total degree 03010000 Voltage negative phase sequence total degree 03070001 A, B, C is mutually under-voltage total degree 03020000 Electric current negative phase sequence total degree 03080000 A, B, C phase overvoltage total degree 03030101 Voltage unbalance total degree 03090000 A, B, C be disconnected phase total degree mutually 03040000 Current imbalance total degree 030A0000 Full decompression total degree 03050000 A, B, the C total degree that stops mutually 030D0000 ? ? A, B, C phase defluidization total degree 030B0000

Table 1

Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.

Claims (9)

1. digital electric energy meter on-line monitoring and an evaluating system, comprise merge cells, switch, RS485 hub, far-end computer, data transmission unit and local computer, it is characterized in that:
Described merge cells: for transmitting data by described switch to a plurality of digital electric energy meters and described far-end computer, wherein said data comprise voltage digital signal and current digital signal;
Described switch: the data of a certain port output of described merge cells are converted to multichannel data, and export respectively described multichannel data to described a plurality of digital electric energy meter and described far-end computer;
Described RS485 hub: collect the energy value of described a plurality of digital electric energy meter metering and anomalous event recording and sending to described far-end computer;
Described far-end computer: receive described data from described switch, by FFT, convert and resolve voltage, current value and be sent to described local computer, and analyze and whether electrical network anomalous event occurs and store described electrical network anomalous event, described energy value and the described anomalous event of also from described RS485 hub, obtaining described a plurality of digital electric energy meter meterings record and store;
Described data transmission unit: the described energy value of the voltage after the described parsing in described far-end computer, current value, described electrical network anomalous event, described a plurality of digital electric energy meter meterings and described anomalous event record are sent back to described local computer by communication network;
Described local computer: calculate electric energy value according to the voltage after the described parsing of passing back in described far-end computer, current value, in each metering cycle, the described energy value of the described electric energy value calculating and described a plurality of digital electric energy meter meterings is once compared, analyze the long-term on-line operation error in dipping of described a plurality of digital electric energy meters; Also according to the described electrical network anomalous event of passing back in described far-end computer, compare with the described electrical network anomalous event record of described a plurality of digital electric power table records respectively, analyze the reliability of the long-term on-line operation event recording function of described a plurality of digital electric energy meters.
2. digital electric energy meter on-line monitoring as claimed in claim 1 and evaluating system, it is characterized in that, the data of described merge cells output are followed IEC61850-9-1 or IEC61850-9-2 communication protocol, and the data of described a plurality of digital electric energy meter outputs are all followed DL/T645-2007 communication protocol.
3. digital electric energy meter on-line monitoring as claimed in claim 1 or 2 and evaluating system, it is characterized in that, regularly freezing data of described a plurality of digital electric energy meters to be assessed is set, described far-end computer sends and reads freezing data order to described a plurality of digital electric energy meters, take and guarantees the data that data that described a plurality of digital electric energy meter is passed back are same time point.
4. digital electric energy meter on-line monitoring as claimed in claim 1 and evaluating system, it is characterized in that, it is cumulative that described local computer carries out an electric energy value in described metering cycle, and compare with the described energy value of described a plurality of digital electric energy meter meterings.
5. digital electric energy meter on-line monitoring as claimed in claim 4 and evaluating system, is characterized in that, described local computer adopts dot product and calculates electric energy value W per second with the method for FFT conversion combination sfor:
W s = &Sigma; i = 1 4000 ( I i - I os ) &times; ( V i - V os ) &times; 1 4000
Wherein, I i, V ithe electric current, the magnitude of voltage that represent respectively i point, i=1,2 ..., 4000; I os, V osrepresent respectively to convert through described FFT current amplitude and the voltage magnitude of the DC component obtaining.
6. digital electric energy meter on-line monitoring as claimed in claim 1 or 2 and evaluating system, is characterized in that, every day is while once broadcasting school at a set time point to all monitored digital electric energy meters, is as the criterion with the described far-end computer time.
7. digital electric energy meter on-line monitoring as claimed in claim 1 or 2 and evaluating system, is characterized in that, described electrical network anomalous event comprises:
(1) A, B, C phase decompression: in three-phase or single phase power supply system, certain phase load electric current is greater than starting current, but the voltage of voltage circuit lower than digital electric energy meter normal working voltage 78% time, and the duration be greater than 1 minute;
(2) A, B, C is mutually under-voltage or A, B, the overvoltage of C phase: in three-phase or single phase power supply system, the voltage of certain phase voltage circuit lower than normal working voltage 220V or 380V 5% or higher than 5%;
(3) full decompression: three-phase voltage is all lower than the critical voltage of digital electric energy meter, and load current is greater than the state of 5% fundamental current;
(4) A, B, C phase defluidization: in three-phase power supply system, three-phase has voltage to be greater than the critical voltage of digital electric energy meter, and in three-phase current, arbitrary phase or two-phase are less than starting current, and other phase line load currents are greater than the state of 5% fundamental current;
(5) A, B, C disconnected phase mutually: in three-phase power supply system, certain occurs that voltage is lower than the critical voltage of digital electric energy meter mutually, and load current is less than the state that the starting current time surpasses 60 seconds simultaneously;
(6) A, B, C stop mutually: in three-phase power supply system, certain occurs that voltage is lower than the critical voltage of digital electric energy meter mutually, and load current is less than the state that the starting current time surpasses 60 seconds simultaneously;
(7) Voltage unbalance rate is not more than 30%: Voltage unbalance rate=((maximal phase voltage-minimum phase voltage)/maximal phase voltage) * 100%;
(8) current imbalance: current imbalance rate=((maximum phase current-minimum phase current)/maximum phase current) * 100%;
(9) voltage negative phase sequence: the leading A phase of C phase voltage, A mutually leading B phase, B mutually leading C be positive phase sequence mutually, otherwise be negative phase sequence;
(10) electric current negative phase sequence: the leading A phase of C phase current, A mutually leading B phase, B mutually leading C be positive phase sequence mutually, otherwise be negative phase sequence.
8. digital electric energy meter on-line monitoring and an appraisal procedure, is characterized in that, comprising:
Step 1 is converted to multichannel data by the data of a certain port output of merge cells by switch, and transfers to respectively far-end computer and a plurality of digital electric energy meter;
Described in step 2, far-end computer carries out FFT conversion to the described data of obtaining, and obtains harmonic voltage, current amplitude and phase differential, and is sent to described local computer;
Described in step 3, far-end computer reads the electric energy value that described a plurality of digital electric energy meter regularly freezes and sends to described local computer in each metering cycle, the electrical network anomalous event that also reads described a plurality of digital electric energy meters records number, if described, record number and change, the anomalous event that reads corresponding digital electric energy meter according to abnormality code records and stores;
Described local computer passed back in the electric energy value that step 4 data transmission unit regularly freezes the harmonic voltage after the described parsing in described far-end computer, current amplitude, described phase differential, described a plurality of digital electric energy meters by transmission network and described anomalous event record, described local computer calculates electric energy value according to the harmonic voltage after the described parsing of passing back, current amplitude, and contrast with the electric energy value of described a plurality of digital electric energy meters of the same time point freezing, calculate the error in dipping of described a plurality of digital electric energy meters;
Described in step 5, whether local computer there is electrical network anomalous event according to harmonic voltage, current amplitude and described phase differential analysis after the described parsing of passing back, and contrast with the anomalous event record of described a plurality of digital electric energy meters, judge the reliability of the electrical network anomalous event writing function of described a plurality of digital electric energy meters.
9. method as claimed in claim 8, is characterized in that, described anomalous event type comprises:
(1) A, B, C phase decompression: in three-phase or single phase power supply system, certain phase load electric current is greater than starting current, but the voltage of voltage circuit lower than digital electric energy meter normal working voltage 78% time, and the duration be greater than 1 minute;
(2) A, B, C is mutually under-voltage or A, B, the overvoltage of C phase: in three-phase or single phase power supply system, the voltage of certain phase voltage circuit lower than normal working voltage 220V or 380V 5% or higher than 5%;
(3) full decompression: three-phase voltage is all lower than the critical voltage of digital electric energy meter, and load current is greater than the state of 5% fundamental current;
(4) A, B, C phase defluidization: in three-phase power supply system, three-phase has voltage to be greater than the critical voltage of digital electric energy meter, and in three-phase current, arbitrary phase or two-phase are less than starting current, and other phase line load currents are greater than the state of 5% fundamental current;
(5) A, B, C disconnected phase mutually: in three-phase power supply system, certain occurs that voltage is lower than the critical voltage of digital electric energy meter mutually, and load current is less than the state that the starting current time surpasses 60 seconds simultaneously;
(6) A, B, C stop mutually: in three-phase power supply system, certain occurs that voltage is lower than the critical voltage of digital electric energy meter mutually, and load current is less than the state that the starting current time surpasses 60 seconds simultaneously;
(7) Voltage unbalance rate is not more than 30%: Voltage unbalance rate=((maximal phase voltage-minimum phase voltage)/maximal phase voltage) * 100%;
(8) current imbalance: current imbalance rate=((maximum phase current-minimum phase current)/maximum phase current) * 100%;
(9) voltage negative phase sequence: the leading A phase of C phase voltage, A mutually leading B phase, B mutually leading C be positive phase sequence mutually, otherwise be negative phase sequence;
(10) electric current negative phase sequence: the leading A phase of C phase current, A mutually leading B phase, B mutually leading C be positive phase sequence mutually, otherwise be negative phase sequence.
CN201410321322.6A 2014-07-08 2014-07-08 On-line monitoring and evaluating system and method for digital electric energy meter CN104076321B (en)

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