CN107069718A - The low-voltage distribution network line loss calculation method influenceed based on three-phase imbalance on line loss - Google Patents
The low-voltage distribution network line loss calculation method influenceed based on three-phase imbalance on line loss Download PDFInfo
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- CN107069718A CN107069718A CN201710335017.6A CN201710335017A CN107069718A CN 107069718 A CN107069718 A CN 107069718A CN 201710335017 A CN201710335017 A CN 201710335017A CN 107069718 A CN107069718 A CN 107069718A
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- 238000004364 calculation method Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 230000005611 electricity Effects 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000011156 evaluation Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The invention discloses a kind of low-voltage distribution network line loss calculation method influenceed based on three-phase imbalance on line loss, this method is comprised the following steps：The data monitored according to load side calculate the head end average load current value of circuit；Point table charge value according to monitoring calculates the substitutional resistance of low-voltage distributing line；Single-phase and tri-phase unbalance factor is calculated according to the data gathered in real time；Calculate line loss.
Description
Technical field
The present invention relates to low-voltage distribution network line loss calculation method, more particularly to a kind of three-phase imbalance that is based on is to line loss shadow
Loud low-voltage distribution network line loss calculation method.
Background technology
Line loss per unit is an important composite economic indicator of power supply enterprise.Because the voltage class of power distribution network is low, relatively
For, line loss per unit caused by unit transmission power is high, and the accurate calculating of theory wire loss is directly connected to the normal operation of power distribution network
And scheduling.Because power distribution network node is more, branch line is more, element is more, and majority element does not possess condition of measurement operational factor etc.
Feature, the condition that Line Loss Calculation is taken based on power flow algorithm is very harsh.The method that a variety of simplification are proposed in practical application,
Such as artificial neural network theories calculate line loss, but this method is not also very ripe in actual applications；Suitable for automation equipment
Line Loss Calculation method, but requirement of this method to automatic measurement is harsher, and domestic power distribution network present situation is
Automatic measurement degree and it is accurate be not very high；Matching Power Flow concept, makes full use of real-time amount to measure, to state estimation and line
Damage to calculate and have certain contribution, but Load obtaining mode is complicated, and not easy to operate and calculating process is complicated, computationally intensive.
Three-phase imbalance is to influence one of principal element of Line Loss of Distribution Network System, introduces the equivalent electricity of improvement of tri-phase unbalance factor
Resistance method, improves the precision of theory wire loss, solves the precision problem of traditional algorithm.
The content of the invention
It is an object of the invention to provide a kind of low-voltage distribution network line loss calculation influenceed based on three-phase imbalance on line loss
Method, makes line loss analyzing simplify with evaluation work, improves the precision of low-voltage network line loss theoretical calculation.
In order to realize the above object the present invention is achieved by the following technical solutions：
A kind of low-voltage distribution network line loss calculation method influenceed based on three-phase imbalance on line loss, is characterized in, the party
Method is comprised the following steps：
The data monitored according to load side calculate the head end average load current value of circuit；
Point table charge value according to monitoring calculates the substitutional resistance of low-voltage distributing line；
Single-phase and tri-phase unbalance factor is calculated according to the data gathered in real time；
Calculate line loss.
It is described calculate data calculate circuit head end average load current value be：
U represents to use electric line rated voltage in formula,For power factor, PiRepresent the electric degree of each point of table some day
Number, Ppj,tFor total active power, it can be represented with summary table electric degree number.
The substitutional resistance R of described calculating low-voltage distributing lineeqFor：
Wherein,
In formula：Ι∑,jfRepresent circuit total rms current of the distribution wire in platform area head end；
Ιi,jfFor current value of the distribution wire in platform area on i-th line road；
P∑,jfFor the equivalent power of the electricity conversion of total outlet kilowatt-hour meter record of typical day；
Pi,jfFor the equivalent power of typical case's in a few days electricity conversion of i-th outlet kilowatt-hour meter record；
U0Corresponding to P∑,jfAnd Pi,jfThe voltage at place；
Req,iFor the resistance value of certain calculating part of path, Req,i=NiRiWherein NiFor the length of each calculating circuit, RiTo calculate
The resistance per unit length value of line conductor.
The data that described basis is gathered in real time calculate single-phase and tri-phase unbalance factor and included：
Calculate each single-phase degree of unbalancedness：
I ∈ [A, Β, C] phase, t ∈ [0, T], T represents period, Ιi,tRepresent monophase current in the value of t, Ιav,tTable
Show average value of certain phase current in t；
And calculate tri-phase unbalance factor：
Tri-phase unbalance factor function expression is：
The computation model of described calculating line loss is：
In formula：N is calculating period constant in formula；YiFor instantaneous tri-phase unbalance factor；N is distribution line low tension outlet electricity
Web frame constant；K is current circuit load curve characteristic coefficient；Ipj,tFor average load electric current；ReqFor substitutional resistance；T is meter
Evaluation time.
The present invention compared with prior art, with advantages below：
1st, influence of each tri-phase unbalance factor to overall line loss per unit can be represented exactly, can be directly used for line loss analyzing work
In work.
2nd, it is simple and direct effective, the precision of low-voltage network line loss theoretical calculation is improved, result of calculation more approaches the true of line loss
Real value, with preferable engineering practicability.
Brief description of the drawings
Fig. 1 is a kind of stream of the low-voltage distribution network line loss calculation method influenceed based on three-phase imbalance on line loss of the present invention
Cheng Tu.
Embodiment
Below in conjunction with accompanying drawing, by describing a preferably specific embodiment in detail, the present invention is further elaborated.
As shown in figure 1, a kind of low-voltage distribution network line loss calculation method influenceed based on three-phase imbalance on line loss, the party
Method is comprised the following steps：
The data monitored according to load side calculate the head end average load current value of circuit；
Point table charge value according to monitoring calculates the substitutional resistance of low-voltage distributing line；
Single-phase and tri-phase unbalance factor is calculated according to the data gathered in real time；
Line loss is calculated according to above result of calculation and the parameter monitored.
Introduce phase degree of unbalancedness β concept
Ι in formulacpFor the average phase current of three-phase load, Ιcp=(ΙA+ΙΒ+ΙC)/3；
For phase current values,
Line loss formula when circuit is uneven is：
R is the resistance of A, B, C three phase transmission line, ΙNFor neutral point current.
The head end average load current value that above-mentioned calculating data calculate circuit is：
U represents to use electric line rated voltage in formula,For power factor, PiRepresent the electric degree of each point of table some day
Number, Ppj,tFor total active power, it can be represented with summary table electric degree number.
The substitutional resistance R of above-mentioned calculating low-voltage distributing lineeqFor：
Wherein,
In formula：Ι∑,jfRepresent circuit total rms current of the distribution wire in platform area head end；
Ιi,jfFor current value of the distribution wire in platform area on i-th line road；
P∑,jfFor the equivalent power of the electricity conversion of total outlet kilowatt-hour meter record of typical day；
Pi,jfFor the equivalent power of typical case's in a few days electricity conversion of i-th outlet kilowatt-hour meter record；
U0Corresponding to P∑,jfAnd Pi,jfThe voltage at place；
Req,iFor the resistance value of certain calculating part of path, Req,i=NiRiWherein NiFor the length of each calculating circuit, RiTo calculate
The resistance per unit length value of line conductor.
The data that above-mentioned basis is gathered in real time calculate single-phase and tri-phase unbalance factor and included：
Calculate each single-phase degree of unbalancedness：
I ∈ [A, Β, C] phase, t ∈ [0, T], T represents period, Ιi,tRepresent monophase current in the value of t, Ιav,tTable
Show average value of certain phase current in t；
And calculate tri-phase unbalance factor：
Tri-phase unbalance factor function expression is：
The computation model of above-mentioned calculating line loss is：
In formula：N is calculating period constant in formula；YiYi is instantaneous tri-phase unbalance factor；N is distribution line low tension outlet
Electric network composition constant, phase three-wire three takes 3, and three-phase and four-line takes 3.5, and two lines take 2；K is current circuit load curve characteristic coefficient；
Ipj,tFor average load electric current；ReqFor substitutional resistance；T is the calculating time.
With certain cell 0.38kV low-voltage distribution transformer platform districts electrical network parameter and service data, traditional substitutional resistance method is utilized respectively
Theoretical line loss caluclation is carried out with substitutional resistance method is improved.
The total electricity in this area on October 4th, 2016 is 483kWh, and power factor is 0.9, and circuit running time T is 24h,
Average phase voltages U is 0.38kV.
Step S1：
The head end average load current value of circuit is calculated according to the parameters of electric power real-time monitored
Step 2：
Point table charge value according to monitoring calculates substitutional resistance
1 point of table charge value of table
Note：N is electronic box number, and W is electricity.
Step 3：
Calculate circuit degree of unbalancedness (data used in formula have cutting load testing instrument to gather in real time)
The current values of table 2 and tri-phase unbalance factor parameter value
Utilize the β of different periods in table 2A, βΒAnd βCParameter value, can then according to tri-phase unbalance factor function formula (4)
Draw the three-phase imbalance angle value Y of different periodst.Formula calculates data used and gathered in real time by load monitor, therefore number
According to more accurate, it can precisely reflect line loss value.
Step 4：According to above result of calculation and table 1, the information of table 2, line loss is calculated
As a result it is as shown in table 3：
The method of table 3 compares
Record the data of distribute-electricity transformer district end loads according to metering automation system, this area on October 4th, 2016 it is total
Table electricity is 483kWh, and point table electricity is 421kWh, and line loss is 62kWh, and line loss per unit is 13%.Utilize traditional substitutional resistance
Algorithm calculates the line loss in this TV station area, and it is 33kWh to draw loss of electricity, and line loss per unit is 7%.This TV station is calculated using this paper algorithms
The line loss in area, it is 27kWh to draw loss of electricity, and line loss per unit is 5.6%.
Shown according to above result of calculation, increment rate of circuit loss and the functional relation of tri-phase unbalance factor that the present invention is derived
Formula may be directly applied to line loss calculation during circuit three-phase imbalance, line loss analyzing is simplified with evaluation work.Improve biography
System substitutional resistance method, introduces influence of the three-phase imbalance to line loss in computation model.Computational methods, which will be improved, to be used to actually match somebody with somebody
The theoretical line loss caluclation of power network, improves the precision of low-voltage network line loss theoretical calculation, and result of calculation is more approached.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (5)
1. a kind of low-voltage distribution network line loss calculation method influenceed based on three-phase imbalance on line loss, it is characterised in that the party
Method is comprised the following steps：
The data monitored according to load side calculate the head end average load current value of circuit；
Point table charge value according to monitoring calculates the substitutional resistance of low-voltage distributing line；
Single-phase and tri-phase unbalance factor is calculated according to the data gathered in real time；
Calculate line loss.
2. the low-voltage distribution network line loss calculation method as claimed in claim 1 influenceed based on three-phase imbalance on line loss, its
It is characterised by, the head end average load current value that the calculating data calculate circuit is：
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For total active power, it can be represented with summary table electric degree number.
3. the low-voltage distribution network line loss calculation method as claimed in claim 1 influenceed based on three-phase imbalance on line loss, its
It is characterised by, the described substitutional resistance R for calculating low-voltage distributing lineeqFor：
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Wherein,
In formula：Ι∑,jfRepresent circuit total rms current of the distribution wire in platform area head end；
Ιi,jfFor current value of the distribution wire in platform area on i-th line road；
P∑,jfFor the equivalent power of the electricity conversion of total outlet kilowatt-hour meter record of typical day；
Pi,jfFor the equivalent power of typical case's in a few days electricity conversion of i-th outlet kilowatt-hour meter record；
U0Corresponding to P ∑s,jfAnd Pi,jfThe voltage at place；
Req,iFor the resistance value of certain calculating part of path, Req,i=NiRiWherein NiFor the length of each calculating circuit, RiTo calculate circuit
The resistance per unit length value of wire.
4. the low-voltage distribution network line loss calculation method as claimed in claim 1 influenceed based on three-phase imbalance on line loss, its
It is characterised by, the data that described basis is gathered in real time calculate single-phase and tri-phase unbalance factor and included：
Calculate each single-phase degree of unbalancedness：
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I ∈ [A, Β, C] phase, t ∈ [0, T], T represents period, Ιi,tRepresent monophase current in the value of t, Ιav,tRepresent certain phase
Average value of the electric current in t；
And calculate tri-phase unbalance factor：
Tri-phase unbalance factor function expression is：
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5. the low-voltage distribution network line loss calculation method as claimed in claim 1 influenceed based on three-phase imbalance on line loss, its
It is characterised by, the computation model of described calculating line loss is：
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<mi>q</mi>
</mrow>
</msub>
<mi>T</mi>
</mrow>
In formula：N is calculating period constant in formula；YiFor instantaneous tri-phase unbalance factor；N is distribution line low tension outlet power network knot
Structure constant；K is current circuit load curve characteristic coefficient；Ipj,tFor average load electric current；ReqFor substitutional resistance；When T is calculates
Between.
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| CN108548954A (en) * | 2018-05-29 | 2018-09-18 | 佛山市旅行青蛙科技有限公司 | A kind of equipment of the situation of monitoring AC electrical device |
| CN108631443A (en) * | 2018-05-29 | 2018-10-09 | 佛山市旅行青蛙科技有限公司 | A kind of equipment of the unbalanced situation of monitoring substation three-phase |
| CN110059975A (en) * | 2019-04-24 | 2019-07-26 | 石家庄市政设计研究院有限责任公司 | The calculation method and its application of uneven dispersion load end pressure drop |
| CN110492504A (en) * | 2019-08-23 | 2019-11-22 | 国网天津市电力公司 | A kind of low-voltage power distribution station area three-phase imbalance optimization phase change method |
| CN111525559A (en) * | 2020-05-08 | 2020-08-11 | 国网辽宁省电力有限公司沈阳供电公司 | Method for quantifying influence of three-phase imbalance of low-voltage distribution network on line loss |
| CN112858898A (en) * | 2021-01-07 | 2021-05-28 | 上海新时达电气股份有限公司 | Relay fault detection method |
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| CN108548954A (en) * | 2018-05-29 | 2018-09-18 | 佛山市旅行青蛙科技有限公司 | A kind of equipment of the situation of monitoring AC electrical device |
| CN108631443A (en) * | 2018-05-29 | 2018-10-09 | 佛山市旅行青蛙科技有限公司 | A kind of equipment of the unbalanced situation of monitoring substation three-phase |
| CN110059975A (en) * | 2019-04-24 | 2019-07-26 | 石家庄市政设计研究院有限责任公司 | The calculation method and its application of uneven dispersion load end pressure drop |
| CN110492504A (en) * | 2019-08-23 | 2019-11-22 | 国网天津市电力公司 | A kind of low-voltage power distribution station area three-phase imbalance optimization phase change method |
| CN111525559A (en) * | 2020-05-08 | 2020-08-11 | 国网辽宁省电力有限公司沈阳供电公司 | Method for quantifying influence of three-phase imbalance of low-voltage distribution network on line loss |
| CN111525559B (en) * | 2020-05-08 | 2023-09-22 | 国网辽宁省电力有限公司沈阳供电公司 | Quantification method for influence of three-phase unbalance of low-voltage distribution network on line loss |
| CN112858898A (en) * | 2021-01-07 | 2021-05-28 | 上海新时达电气股份有限公司 | Relay fault detection method |
| CN113722678A (en) * | 2021-09-03 | 2021-11-30 | 南京南瑞信息通信科技有限公司 | Transformer area line loss calculation method, system, storage medium and calculation device |
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