CN109510197A - The line loss calculation method of platform area power distribution network - Google Patents
The line loss calculation method of platform area power distribution network Download PDFInfo
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- CN109510197A CN109510197A CN201811480246.8A CN201811480246A CN109510197A CN 109510197 A CN109510197 A CN 109510197A CN 201811480246 A CN201811480246 A CN 201811480246A CN 109510197 A CN109510197 A CN 109510197A
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- distribution network
- power distribution
- platform area
- line loss
- unbalancedness
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- 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
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- 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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses the line loss calculation methods of a kind of area's power distribution network, the operating parameter including obtaining platform area power distribution network；Calculate the degree of unbalancedness of the three-phase load electric current of platform area power distribution network；The line loss of platform area power distribution network is calculated using substitutional resistance method.The line loss calculation method of this area's power distribution network provided by the invention, line loss caused by three-phase load current imbalance is considered when to the loss calculation of platform area distribution line to increase, and tri-phase unbalance factor is introduced in the line loss calculation for improving electric-resistivity method, therefore the method for the present invention has fully considered to be lost caused by degree of unbalancedness and increase, it can accurately reflect the line loss value of power distribution network, and the method for the present invention accuracy in computation is high, high reliablity and simple and convenient.
Description
Technical field
Present invention relates particularly to the line loss calculation methods of a kind of area's power distribution network.
Background technique
With the development of economic technology, electric energy has become essential secondary energy sources in people's production and life,
Endless convenience is brought to people's production and life.
In the operational process of platform area power distribution network, since the imbalance of load will cause the imbalance of load current, in turn
Lead to the increase of line loss.When load unbalanced, the loss on three-phase line and the neutral conductor can all increase compared under equilibrium state
Add, line loss value is even up to as many as 6 times under equilibrium state in the limiting case, causes a large amount of of electric energy in transmission process
Loss.
Currently, in the line loss calculation of power distribution network, the case where not considering degree of unbalancedness and then lead to calculated value and reality
The case where border operating condition is larger compared to gap, and calculated value can not accurately reflect actual motion.
Summary of the invention
High, high reliablity that the purpose of the present invention is to provide a kind of accuracies in computation and simply and easily platform area power distribution network
Line loss calculation method.
The line loss calculation method of this area's power distribution network provided by the invention, includes the following steps:
S1. the operating parameter of platform area power distribution network is obtained；
S2. the degree of unbalancedness of the three-phase load electric current of platform area power distribution network is calculated；
S3. according to the degree of unbalancedness of the obtained three-phase load electric current of step S2, platform area is calculated using substitutional resistance method and is matched
The line loss of power grid.
Described in step S1 obtain platform area power distribution network operating parameter, specially according to the structure in platform area to platform area user into
Row divides, and platform area route is divided into several segments, is judged separate locating for user, and according to the actual motion state of route
Obtain the operating parameter of platform area power distribution network.
The degree of unbalancedness of three-phase load electric current is calculated described in step S2, is specially calculated using following formula uneven
Degree:
β in formulaAFor the degree of unbalancedness of A phase current, βBFor the degree of unbalancedness of B phase current, βCFor the degree of unbalancedness of C phase current,
IAFor the root-mean-square valve of A phase load electric current, IBFor the root-mean-square valve of B phase load electric current, ICFor the root-mean-square valve of C phase load electric current,
IavFor the average value of the root-mean-square valve of three-phase load electric current.
The line loss for being calculated platform area power distribution network described in step S3 using substitutional resistance method, is specially calculated using following steps
Line loss:
A. following formula computed losses increment rate K is used1:
Δ P in formulaLFor route total losses；ΔPbFor the route total losses under equilibrium state；IavFor three-phase load electric current
The average value of root-mean-square valve；R is line resistance value；βAFor the degree of unbalancedness of A phase current；βBFor the degree of unbalancedness of B phase current；βC
For the degree of unbalancedness of C phase current；
B. equivalent line resistance R is calculated using following formulael:
A in formulaPiFor i-th section of route resident's active energy；AQiFor i-th section of route resident's capacity of idle power；RiFor
The resistance value of i-th section of route；APFor the total active power of platform area transformer low voltage outlet side；AQFor platform area transformer low voltage outlet side
Total reactive power；N is the total segments of platform area route；
C. the line loss Δ A of platform area power distribution network is calculated using following formula:
Δ A is moon line loss in formula；K1For the loss increment rate under non-equilibrium state；N is distribution transformer low-pressure side
Export structure coefficient, when system is to take 2 when single-phase-two-wire system is powered, system is that three-phase three-wire system takes 3 when powering；ImavIt is flat for the moon
Equal load current；K is distribution transformer outlet side load curve form factor；RelFor equivalent line resistance；T is calculation interval.
The line loss calculation method of this area's power distribution network provided by the invention is examined when to the loss calculation of platform area distribution line
The increase of line loss caused by three-phase load current imbalance is considered, and tri-phase unbalance factor is introduced and improves electric-resistivity method
In line loss calculation, therefore the method for the present invention has fully considered to be lost caused by degree of unbalancedness and increase, and can accurately reflect distribution
The line loss value of net, and the method for the present invention accuracy in computation is high, high reliablity and simple and convenient.
Detailed description of the invention
Fig. 1 is the method flow diagram of the method for the present invention.
Specific embodiment
It is as shown in Figure 1 the method flow diagram of the method for the present invention: the line loss meter of this area's power distribution network provided by the invention
Calculation method, includes the following steps:
S1. the operating parameter for obtaining platform area power distribution network, specially divides platform area user according to the structure in platform area, will
Platform area route is divided into several segments, judges separate locating for user, and obtains platform area according to the actual motion state of route
Operating parameter of power distribution network, including active energy, capacity of idle power and resistance value etc.；
S2. the degree of unbalancedness of the three-phase load electric current of platform area power distribution network is calculated；It is specially calculated using following formula uneven
Weighing apparatus degree:
β in formulaAFor the degree of unbalancedness of A phase current, βBFor the degree of unbalancedness of B phase current, βCFor the degree of unbalancedness of C phase current,
IAFor the root-mean-square valve of A phase load electric current, unit A, IBFor the root-mean-square valve of B phase load electric current, unit A, ICIt is born for C phase
The root-mean-square valve of charged current, unit A, IavFor the average value of the root-mean-square valve of three-phase load electric current, unit A；
S3. according to the degree of unbalancedness of the obtained three-phase load electric current of step S2, platform area is calculated using substitutional resistance method and is matched
The line loss of power grid；Specially line loss is calculated using following steps:
A. following formula computed losses increment rate K is used1:
Δ P in formulaLFor route total losses, unit kWh；ΔPbFor the route total losses under equilibrium state, unit kWh；
IavFor the average value of the root-mean-square valve of three-phase load electric current, unit A；R is line resistance value；βAFor the imbalance of A phase current
Degree；βBFor the degree of unbalancedness of B phase current；βCFor the degree of unbalancedness of C phase current；
B. equivalent line resistance R is calculated using following formulael:
A in formulaPiFor i-th section of route resident's active energy, unit kWh；AQiFor i-th section of route resident without
Function electricity, unit kWh；RiFor the resistance value of i-th section of route, unit Ω；APIt is always active for platform area transformer low voltage outlet side
Power, unit kWh；AQFor the total reactive power of platform area transformer low voltage outlet side, unit kWh；N is that platform area route is always segmented
Number；
C. the line loss Δ A of platform area power distribution network is calculated using following formula:
Δ A is moon line loss, unit kWh in formula；K1For the loss increment rate under non-equilibrium state；N is distribution change
Depressor low side outlets structural coefficient, when system is to take 2 when single-phase-two-wire system is powered, system is that three-phase three-wire system takes 3 when powering；
ImavFor monthly average load current, unit A；K is distribution transformer outlet side load curve form factor；RelFor equivalent line
Resistance, unit Ω；T is calculation interval, takes the total hourage of the moon.
Claims (4)
1. the line loss calculation method of a kind of area's power distribution network, includes the following steps:
S1. the operating parameter of platform area power distribution network is obtained；
S2. the degree of unbalancedness of the three-phase load electric current of platform area power distribution network is calculated；
S3. according to the degree of unbalancedness of the obtained three-phase load electric current of step S2, platform area power distribution network is calculated using substitutional resistance method
Line loss.
2. the line loss calculation method of according to claim 1 area's power distribution network, it is characterised in that acquisition described in step S1
The operating parameter of platform area power distribution network specially divides platform area user according to the structure in platform area, if platform area route is divided into
Dry section, judges separate locating for user, and is joined according to the operation that the actual motion state of route obtains platform area power distribution network
Number.
3. the line loss calculation method of according to claim 1 or 2 area's power distribution network, it is characterised in that meter described in step S2
The degree of unbalancedness of three-phase load electric current is calculated, degree of unbalancedness is specially calculated using following formula:
β in formulaAFor the degree of unbalancedness of A phase current, βBFor the degree of unbalancedness of B phase current, βCFor the degree of unbalancedness of C phase current, IAFor A
The root-mean-square valve of phase load electric current, IBFor the root-mean-square valve of B phase load electric current, ICFor the root-mean-square valve of C phase load electric current, IavFor
The average value of the root-mean-square valve of three-phase load electric current.
4. the line loss calculation method of according to claim 1 or 2 area's power distribution network, it is characterised in that adopted described in step S3
The line loss of platform area power distribution network is calculated with substitutional resistance method, specially calculates line loss using following steps:
A. following formula computed losses increment rate K is used1:
Δ P in formulaLFor route total losses；ΔPbFor the route total losses under equilibrium state；IavFor the r.m.s. of three-phase load electric current
The average value of value；R is line resistance value；βAFor the degree of unbalancedness of A phase current；βBFor the degree of unbalancedness of B phase current；βCFor C phase electricity
The degree of unbalancedness of stream；
B. equivalent line resistance R is calculated using following formulael:
A in formulaPiFor i-th section of route resident's active energy；AQiFor i-th section of route resident's capacity of idle power；RiIt is i-th section
The resistance value of route；APFor the total active power of platform area transformer low voltage outlet side；AQIt is always idle for platform area transformer low voltage outlet side
Power；N is the total segments of platform area route；
C. the line loss Δ A of platform area power distribution network is calculated using following formula:
Δ A is moon line loss in formula；K1For the loss increment rate under non-equilibrium state；N is distribution transformer low side outlets knot
Structure coefficient, when system is to take 2 when single-phase-two-wire system is powered, system is that three-phase three-wire system takes 3 when powering；ImavFor monthly average load
Electric current；K is distribution transformer outlet side load curve form factor；RelFor equivalent line resistance；T is calculation interval.
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Cited By (5)
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| CN110275072A (en) * | 2019-07-23 | 2019-09-24 | 国网湖南省电力有限公司 | The phase line detector and its detection method in low-voltage three-phase load imbalance platform area |
| CN111446727A (en) * | 2020-04-03 | 2020-07-24 | 贵州电网有限责任公司 | Low-voltage transformer area three-phase imbalance treatment method based on economic indexes |
| 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 |
| CN112380711A (en) * | 2020-11-18 | 2021-02-19 | 国家电网有限公司 | Three-phase unbalance calculation method and device based on consideration of zero line loss |
| CN113269462A (en) * | 2021-06-08 | 2021-08-17 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Transformer area line loss calculation method based on edge calculation |
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| 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 |
| CN112380711A (en) * | 2020-11-18 | 2021-02-19 | 国家电网有限公司 | Three-phase unbalance calculation method and device based on consideration of zero line loss |
| CN113269462A (en) * | 2021-06-08 | 2021-08-17 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Transformer area line loss calculation method based on edge calculation |
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