CN109270360A - A kind of method of the online line loss of high precision computation - Google Patents
A kind of method of the online line loss of high precision computation Download PDFInfo
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- CN109270360A CN109270360A CN201811398193.5A CN201811398193A CN109270360A CN 109270360 A CN109270360 A CN 109270360A CN 201811398193 A CN201811398193 A CN 201811398193A CN 109270360 A CN109270360 A CN 109270360A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000004891 communication Methods 0.000 claims abstract description 32
- 230000008014 freezing Effects 0.000 claims abstract description 10
- 238000007710 freezing Methods 0.000 claims abstract description 10
- 230000005611 electricity Effects 0.000 claims abstract description 7
- 230000001186 cumulative effect Effects 0.000 claims abstract description 5
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 238000005070 sampling Methods 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 2
- 230000010354 integration Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
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- 230000002500 effect on skin Effects 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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Abstract
The invention discloses a kind of methods of the online line loss of high precision computation, this method is based on power, voltage, electric current and a period of time electric degree cumulative amount at synchronization (being accurate within 5ms) measurement route both ends, provides accurately data for line loss analyzing.More electric energy meters in wide scope are configured by hardware and software, other external sync clocks can be received by numeral input mouth, when monitoring a pulse (transformation of the numeral input from OFF to ON), it just starts freezing procedures: freezing to calculate cycle data, current accurate power is calculated, and starts and calculates a period of time electricity.Triggering is also possible to communicate correcting delay signal triggering when this synchronization can be the school GPS.By freezing calculating and the integration of communication network back-end data inside electric energy meter, realize that accurately line loss calculates and load balance calculates.
Description
Technical field
The invention belongs to electric system to monitor field, the in particular to method of a kind of online line loss of high precision computation on-line.
Background technique
In the circuit on power system operational process of factory, line loss problem largely reflects the event of power circuit operation
Barrier rate, therefore, the research of line loss calculation and decreasing loss method is the content of electric system primary study, and line loss research is one multiple
Miscellaneous project, wherein overhead transmission line is bigger by effect of natural conditions, such as: rainwater, hail, the loss ratio that can all lead to route
It is larger；Power cable is different from trolley wire, smaller by effect of natural conditions, but with cable resistance, line media, shield
All there is certain relationship in set, steel band happy dress.
Regulation in " the evaluation enterprise's rational utilization of electricity fire protection technology " that China issues, enterprises grid bus loss rate (enterprise
Receiving end is to electrical equipment) index that should reach are as follows: a transformation 3.5% hereinafter, secondary transformation 5.5% hereinafter, transformation three times
7% or less.But total line loss of China's factory and enterprise internal electric network be much higher than national standard requirement, and up to 10%, verifying
Up to 14~15%, therefore, to often go carry out line loss monitoring, research and analysis, take reducing loss measure very necessary.
Line loss is primarily referred to as power cable line active loss part at present, the energy loss on route line loss,
For line loss percentage shared in all conveying electric energy line loss per unit, it is the economic indicator for measuring enterprises power supply.
Enterprise generally uses ac power supply method, is easy to produce skin effect and kindred effect by the conducting wire of alternating current.Skin effect
Examining the current density ratio of conductor cross-section central part, the current density through conducting wire edge is small, this is equivalent to the effective cross-section of conducting wire
Reduce, improve conductor resistance.
Traditional method generally installs measuring instrumentss in end of incoming cables and equipment side, and system reads measuring instrumentss for a period of time
Then electric energy cumulative amount data carry out simple difference and calculate the loss for being considered as this route.Conventionally, inlet wire is read
End and equipment side measuring instrumentss, either manual meter reading or communication mechanism are read, and will necessarily have time difference, the data of reading
It is not the data of synchronization, the data of different moments is simply sought into difference in this way, there will certainly be biggish deviation.
Summary of the invention
In order to overcome above-mentioned defect existing in the prior art, the present invention provides a kind of side of online line loss of high precision computation
Method can more accurately calculate the loss of route.
In order to achieve the above objectives, a kind of the technical solution adopted by the present invention are as follows: realization side of the online line loss of high precision computation
Method, electric energy meter synchronized sampling in wide scope is synchronous to calculate storage, passes through communication management unit and reads the data latched, realizes
Agonic line loss function of statistic analysis.
A kind of implementation method of the online line loss of high precision computation, comprising the following steps:
Step 1: collection in worksite electric energy meter realizes data-frozen function, and guarantees that electric energy meter is in same a period of time in wide scope
Between point freeze；
Step 2: after electric energy meter CPU processor receives synchronization pulse triggering, mark is set in Sampling interrupt, and open
It wards off independent sampled point record storage and latches area, 1 cycle complete sample point of front is all moved and freezes sampling buffer, together
Shi Jilu latches the time.Subsequent electric energy meter CPU calculates three-phase current, three-phase voltage, active using the sampling point value of the latch
Power, reactive power value；
Step 3: the electric energy meter in wide scope is in the same electric degree for freezing moment K1 point and starting calculating a period of time
Consumption；
Step 4: has the communication management unit of breakpoint transmission function by communication interface, by the electric energy in wide scope
Electric current, voltage, power, electric degree aggregate-value for freezing in table etc. are collected into together by the communication management unit in region；
Step 5: monitoring SCADA software systems are to collecting the data (being stored in MYSQL database) come according to freezing
Time reads from database, utilization preset line topological relationship, can intuitively calculate route line loss, voltage drop,
Real-time current difference etc..
Load balance calculates:
I is into=I1+I2+I3+I4+ ...+IN
P is into=P1+P2+P3+P4+ ...+PN
Voltage loss
△ U=UPower end-ULoad end
Line loss calculation
Line loss per unit=(W1-W2)/W1*100%
Further, the electric energy meter, the communication interface of module and routine when increasing the school GPS on hardware have on software
It is standby to support two kinds of data latch modes: pulse starting and communication broadcasting command starting when internet GPS school.
The communication management unit is ordered when realizing regularly Web broadcast school automatically, itself supports to receive correcting delay signal,
Have each analog quantity electricity information storage at least 31 days, breakpoint transmission function and the new storage of preferential calling is supported to freeze to calculate
Power, electric degree, electric current, voltage calculated value function.
The method of above-mentioned calculating line loss, it is further characterized by:
In step 1, the data freezed include: power, electric current, voltage real value and the freeze-off time point of synchronization
A period of time electric degree aggregate-value afterwards.
In step 2, the start command that electric energy meter receives need to be set as super objective, pass through the external interrupt (IO of CPU
Mouth interrupts or communicating interrupt) directly stop low-level tasks, into interrupt processing task.
In step 3, the electric degree is the aggregate-value of a period of time power: W=P △ t；△ t=(K2-K1) time exists
Electric energy meter time consistency in wide scope then ensure that each table cumulative time section is identical.
Further, the communication management unit point of interruption resumes the implementation method of function are as follows: in-site collecting module is periodically called
Acquired electric energy meter information, and stored in a manner of XML file, concentrated collection module receives and parses through XML file, is determining format just
File is saved in real-time area, backup area after really, is write data into MYSQL database later, and delete real-time area file.
The utility model has the advantages that the present invention is joined between electric energy meter, communication management unit in a kind of simple and practical method
It is dynamic, it realizes each power loop, voltage, electric current, the synchronized sampling of electricity and the measurement of wide scope, ensure that line loss calculation
Accuracy.
Detailed description of the invention
Fig. 1 is system wiring schematic diagram of the invention.
Fig. 2 is the schematic diagram that electric energy meter of the invention receives trigger pulse.
Fig. 3 is electric energy meter data buffer area schematic diagram of the invention.
Fig. 4 is the increased communication protocol point table of the present invention.
Specific embodiment
For the ease of the understanding of those skilled in the art, the present invention is made further below with reference to embodiment and attached drawing
Bright, the content that embodiment refers to not is limitation of the invention.
A kind of implementation method of the online line loss of high precision computation of the present embodiment, specific technology realize that steps are as follows:
Step 1: the present invention relates to collection in worksite electric energy meter, pass through and increase specific hardware device and algorithm, it is real
Existing data-frozen function, and guarantee that electric energy meter freezes at same time point in wide scope, freezing data includes: synchronization
A period of time electric degree aggregate-value after power, electric current, voltage real value and freeze-off time point.
Field electric energy table, the communication interface of module and routine when increasing the school GPS on hardware have two kinds of support on software
Data latch mode: pulse starting or communication broadcasting command starting when internet GPS school.The starting life that field electric energy table receives
It enables, super objective need to be set as, low-level tasks are directly stopped by the external interrupt (I/O port interrupts or communicating interrupt) of CPU, into
Enter interrupt processing task.
Step 2: after electric energy meter CPU processor receives synchronization pulse triggering, mark is set in Sampling interrupt, and open
It wards off independent sampled point record storage and latches area, 1 cycle complete sample point of front is all moved and freezes sampling buffer, together
Shi Jilu latches the time.Subsequent electric energy meter CPU calculates three-phase current, three-phase voltage, active using the sampling point value of the latch
Power, reactive power value.Since each electric energy meter is latched in synchronization, the electric energy meter in this way in guarantee wide scope is calculated closely
The analog quantity of synchronization.
Step 3: the electric energy meter in wide scope is in the same electric degree for freezing moment K1 point and starting calculating a period of time
Consumption, this period can adjust, such as 10 minutes, 1 hour or 1 day.
Electric degree is the aggregate-value of a period of time power: W=P △ t；Electricity of △ t=(K2-K1) time in wide scope
Energy table time consistency then ensure that each meter cumulative time section is identical.
Step 4: having the communication management unit of breakpoint transmission function by communication interface, by the electric energy meter in wide scope
In the electric current, voltage, power, the electric degree aggregate-value that freeze etc. by the communication management unit in region be collected into together, due to
Data are frozen, and the delay for communicating calling has been not considered.Communication management unit supports breakpoint transmission function and preferential calling new
The power calculated, the function of electric degree, electric current, voltage calculated value are freezed in storage.Specific way are as follows: the communication management unit of website
The data that will be read by communication, the file table of XML are saved as according to time tag, according to current storage size, Ke Yicun
Store up a month data.Central station communication management unit and website communication management unit communications, since central station needs to access region
Range is wide, data in the website communication management unit more than quantity, breaks if there is some website link, after link-recovery,
Stored tables of data can be recruited again and arrive central station, central station communication management unit automatic discrimination goes out the number which is amended record
According to, and according to fixed format amended record into MYSQL database.
Step 5: monitoring SCADA software systems are to collecting the data (being stored in MYSQL database) come according to freezing
Time reads from database, utilization preset line topological relationship, can intuitively calculate route line loss, voltage drop,
Real-time current difference etc..
Load balance calculates:
I is into=I1+I2+I3+I4+ ...+IN
P is into=P1+P2+P3+P4+ ...+PN
Voltage loss
△ U=UPower end-ULoad end
Line loss calculation
Line loss per unit=(W1-W2)/W1*100%.
Above embodiment is merely illustrative of the invention's technical idea, and this does not limit the scope of protection of the present invention, all
It is any changes made on the basis of the technical scheme according to the technical idea provided by the invention, each falls within present invention protection model
Within enclosing.The technology that the present invention is not directed to can be realized by existing technology.
Claims (8)
1. a kind of implementation method of the online line loss of high precision computation, it is characterised in that: the electric energy meter synchronized sampling in wide scope
It is synchronous to calculate storage, the data latched are read by communication management unit, realize agonic line loss function of statistic analysis.
2. the method according to claim 1, wherein including:
Step 1: collection in worksite electric energy meter realizes data-frozen function, and guarantees that electric energy meter is at same time point in wide scope
Freeze；
Step 2: after electric energy meter CPU processor receives synchronization pulse triggering, setting active flag in Sampling interrupt, and
It opens up independent sampled point record storage and latches area, 1 cycle complete sample point of front is all moved and freezes sampling buffer,
It records simultaneously and latches the time, subsequent electric energy meter CPU calculates three-phase current using the sampling point value of the latch, three-phase voltage, has
Function power and reactive power value；
Step 3: the electric energy meter in wide scope is in the same electric degree consumption freezed moment K1 point and start calculating a period of time
Amount；
Step 4: the communication management unit for having breakpoint transmission function passes through communication interface, will be in the electric energy meter in wide scope
Electric current, voltage, power, electric degree aggregate-value for freezing etc. are collected into together by the communication management unit in multiple regions；
Step 5: monitoring SCADA software systems are to the next data (being stored in MYSQL database) of collection according to freeze-off time
It is read from database, utilization preset line topological relationship, can intuitively calculate route line loss, voltage drop, in real time
Current difference etc.,
Load balance calculates:
I is into=I1+I2+I3+I4+ ...+IN
P is into=P1+P2+P3+P4+ ...+PN
Voltage loss
△ U=UPower end-ULoad end
Line loss calculation
Line loss per unit=(W1-W2)/W1*100%.
3. according to the method described in claim 1, when increasing the school GPS it is characterized by: the electric energy meter, on hardware module and
Conventional communication interface has on software and supports two kinds of data latch modes: pulse starting and communication broadcast life when internet GPS school
Enable starting.
4. according to the method described in claim 1, it is characterized by: the communication management unit, automatic to realize regularly network
It is ordered when broadcasting school, itself supports to receive correcting delay signal, had each analog quantity electricity information storage at least 31 days, support disconnected
Point resumes function and the power calculated, the function of electric degree, electric current, voltage calculated value are freezed in the new storage of preferential calling.
5. according to the method described in claim 2, it is characterized in that, in step 1:
The data freezed include: synchronization power, electric current, voltage real value and freeze-off time point after a period of time electric degree
Aggregate-value.
6. according to the method described in claim 2, it is characterized in that, in step 2:
The start command that the electric energy meter receives need to be set as super objective, by the external interrupt of CPU (I/O port interrupt or
Communicating interrupt) directly stop low-level tasks, into interrupt processing task.
7. according to the method described in claim 2, it is characterized in that, in step 3:
The electric degree is the aggregate-value of a period of time power: W=P △ t；Electricity of △ t=(K2-K1) time in wide scope
Energy table time consistency then ensure that each table cumulative time section is identical.
8. according to the method described in claim 4, it is characterized in that, the implementation method of the breakpoint transmission function are as follows: adopt on the spot
Collection module periodically calls acquired electric energy meter information, and is stored in a manner of XML file, and concentrated collection module receives and parses through XML
File saves file in real-time area, backup area after judgement format is correct, writes data into MYSQL database later, and delete
Except real-time area file.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113419189A (en) * | 2020-08-06 | 2021-09-21 | 为准（北京）电子科技有限公司 | Line loss testing method, comprehensive tester and storage medium |
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2018
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|---|---|---|---|---|
| US6757628B1 (en) * | 1998-07-14 | 2004-06-29 | Landis+Gyr Inc. | Multi-level transformer and line loss compensator and method |
| CN102497030A (en) * | 2011-12-28 | 2012-06-13 | 山东电力研究院 | Line-loss actual-measurement and positioning method based on high-voltage electric energy meter and system thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113419189A (en) * | 2020-08-06 | 2021-09-21 | 为准（北京）电子科技有限公司 | Line loss testing method, comprehensive tester and storage medium |
| CN113419189B (en) * | 2020-08-06 | 2022-02-22 | 为准（北京）电子科技有限公司 | Line loss testing method, comprehensive tester and storage medium |
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