CN110518586A - A kind of main transformer desired load rate calculation method based on typical contact model - Google Patents
A kind of main transformer desired load rate calculation method based on typical contact model Download PDFInfo
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- CN110518586A CN110518586A CN201910888412.6A CN201910888412A CN110518586A CN 110518586 A CN110518586 A CN 110518586A CN 201910888412 A CN201910888412 A CN 201910888412A CN 110518586 A CN110518586 A CN 110518586A
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- main transformer
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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
Abstract
The invention discloses a kind of main transformer desired load rate calculation methods based on typical contact model, include the following steps: the direct transfer and indirect branch of step 100, the main transformer load for defining Distribution Network Equipment；Step 200, the constraint condition for determining typical contact model；Step 300 gets in touch with model based on typical, analyzes main transformer load of the Distribution Network Equipment in the case where meeting main transformer " N-1 " principle.The present invention, to the main transformer load factor met under main transformer " N-1 " principle, determines the branch mode for the main transformer got in touch between station and the judgment basis of overload factor, to realize main transformer desired load rate calculation method under the basis of typical contact model.
Description
Technical field
The present embodiments relate to Distribution Network Equipment assessment technique fields, and in particular to a kind of to get in touch with model based on typical case
Main transformer desired load rate calculation method.
Background technique
Distribution Network Equipment is directly related to user as the link for being directly facing terminal user in electric system, distribution system
Electricity consumption reliability and power quality, in the power system have consequence.For a long time, power industry supplies reflection
The reliability of the rate of qualified voltage of electricity quality, the line loss per unit for reflecting performance driving economy and reflection power supply duration has more
Research achievement, and it is used to reflect the Distribution Network Equipment utilization rate of distribution network construction economy and power grid asset service condition, do not have also
A complete appraisement system is formed, effectively the concrete condition to Distribution Network Equipment utilization rate cannot carry out qualitative, quantitative
Analysis.
Statistical data shows that the equipment Rate of average load of one side China power grid is less than 35%；On the other hand, in recent years,
Capital investment of the China for distribution network construction transformation is gradually increased.If can be in the premise for guaranteeing power supply reliability and power supply quality
Effective lifting means utilization rate down then can significantly save the investment of power grid.Determining for utilization rate of equipment and installations lifting scheme needs
It establishes on the basis of to utilization rate of equipment and installations really detailed evaluation analysis, it is therefore necessary to construct a kind of power distribution network that science is practical
Utilization rate of equipment and installations overall evaluation system.
For many years, power supply enterprise usually utilizes the quality of " three rates " Lai Hengliang distribution system performance, i.e. reflection power supply continues
Property reliability, reflect performance driving economy line loss per unit, reflect power supply quality rate of qualified voltage.But for reflecting that power grid is built
If the index of economy and its relevant appraisal procedure but fail sufficiently to be paid close attention to, to cause current electric grid utilization rate of equipment and installations
It is relatively low.
The utilization rate that Distribution Network Equipment is measured using maximum load rate or Rate of average load is a kind of preferable mode, but
It is also to be difficult to sufficiently reflect its true utilization efficiency only with this calculation, it is how objective in power distribution network development process
It scientifically evaluates its overall utilization rate, how to determine reasonable evaluation principle, current distribution network planning using peak load as base
It is all the problem related with power distribution network utilization efficiency that whether plinth is properly equal, but does not have main transformer desired load rate calculation formula yet at present
Sufficiently to reflect its true utilization efficiency.
Summary of the invention
The purpose of the present invention is to provide a kind of main transformer desired load rate calculation methods based on typical contact model, with solution
Certainly the problems of the prior art.
To achieve the goals above, embodiments of the present invention provide the following technical solutions:
A kind of main transformer desired load rate calculation method based on typical contact model, includes the following steps:
Step 100, define Distribution Network Equipment main transformer load directly shift and indirect branch；
Step 200, the constraint condition for determining typical contact model；
Step 300 gets in touch with model based on typical, and it is negative to analyze main transformer of the Distribution Network Equipment in the case where meeting main transformer " N-1 " principle
Load rate.
As a preferred solution of the present invention, the direct transfer are as follows:
When making " N-1 " verification to certain main transformer, which only considers to be transferred to by a switch motion
Directly have on each main transformer of communication relationship with the main transformer；
The indirect branch are as follows:
When making " N-1 " verification to certain main transformer, which first carries out once turning to supply, by institute's on-load be transferred in station with
Have therewith on the main transformer directly got in touch between standing；If main transformer overload in standing, need for the sub-load of overload to be transferred between station with
Have on other main transformers of contact.
As a preferred solution of the present invention, the constraint condition of the typical contact model includes:
Each main transformer capacity S is identical in substation, and interconnects between interior main transformer of standing, and low-pressure side uses in Ji Shuan main transformer substation station
Interior low-pressure side is stood using single female four section wirings by single mother partition wiring, three main transformer substations；
Service channel is identical between substation station, and can satisfy the demand turned for capacity；
The main transformer got in touch between standing is using directly transfer.
As a preferred solution of the present invention, when the main transformer got in touch in standing considers overload factor k, since main transformer can only be permitted
Perhaps short-time overload, then should be shifted the load of overburden portion using indirect branch is had on the main transformer of contact between arriving at a station, and in main transformer
After failure, after the completion of all load transfers, except other main transformers of failure main transformer all reach nominal load.
As a preferred solution of the present invention, it under the typical contact model, when overload factor k=1, that is, is impermissible for
Overload, can only directly be shifted, i.e., the load of the main transformer institute band can only be given to the main transformer directly got in touch with it, be joined in typical case
It is n+m-2 with the pricinpal variable that a main transformer is directly got in touch in network model；
Defining f (m, n) is main varying load rate, and the load factor highest of main transformer can achieve:
As a preferred solution of the present invention, in the case where typical case gets in touch with model, when overload factor k > 1, as main transformer failure
When, in two kinds of situation:
The first situation is ideally that overload factor is sufficiently large, can satisfy overload and requires；
Second situation overload factor has certain limit, can not determine whether that meeting overload requires.
As a preferred solution of the present invention, in the first case, when a main transformer in a substation
Failure, the load of the main transformer institute band can be given to all main transformers in typical contact model in addition to itself；All main transformers
Load factor is up to:
As a preferred solution of the present invention, in the second case mentioned, when a main transformer in a substation
Failure, the main transformer being connected directly with failure main transformer will bear all loads of failure main transformer, then by indirect branch, will be more than
The load of nominal load part itself is transferred to the non-faulting main transformer being connected directly with itself and determines whether in indirect branch
Meet the requirement of overload factor k, if being unsatisfactory for overload factor, it will there is sub-load power loss.
As a preferred solution of the present invention, it is assumed that every main transformer all operates in the case of desired load, i-th power transformation
Jth platform main transformer failure in standing, the then main transformer directly got in touch with j main transformer reach the load that full load is shared and areAt this point, being fully loaded with the main transformer that j is directly got in touch with, j main transformer remaining loadIt will
By being born in short-term with it with other n-1 main transformer in i substation, then by indirect branch, by overload load transfer
Into other substations in the main transformer of underload；
The overload load can indirect branch, born to be more than nominal load portion depending on every in n-1 platform main transformer
PointWhether satisfaction overload requires,
I.e.
Assuming that function g (m, n) indicate with j main transformer with i substation main transformer remove meet overload require it is remaining
Capacity, then:
As g (m, n)≤0, shows the requirement that can satisfy overload factor k when indirect branch, be equivalent to ideally mistake
It is very big to carry coefficient, as g (m, n) > 0, when showing indirect branch, the requirement of overload factor k is unable to satisfy by the main transformer for turning to supply.
Embodiments of the present invention have the advantages that
The present invention, to the main transformer load factor met under main transformer " N-1 " principle, determines station under the basis of typical contact model
Between the judgment basis of the branch mode of main transformer and overload factor got in touch with, to realize main transformer desired load rate calculation method.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Structure depicted in this specification, ratio, size etc., only to cooperate the revealed content of specification, for
Those skilled in the art understands and reads, and is not intended to limit the invention enforceable qualifications, therefore does not have technical
Essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size are not influencing the function of the invention that can be generated
Under effect and the purpose that can reach, should all still it fall in the range of disclosed technology contents can cover.
Fig. 1 is the method flow diagram of embodiment of the present invention；
Fig. 2 is the schematic diagram directly shifted in embodiment of the present invention with indirect branch.
Specific embodiment
To enable the purpose of the present invention, feature, advantage more obvious and understandable, implement below in conjunction with the present invention
Attached drawing in example, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that reality disclosed below
Applying example is only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this field is common
Technical staff's all other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
As shown in Figure 1, the present invention provides a kind of main transformer desired load rate calculation method based on typical contact model,
It is characterized in that, includes the following steps:
Step 100, define Distribution Network Equipment main transformer load directly shift and indirect branch；
Step 200, the constraint condition for determining typical contact model；
Step 300 gets in touch with model based on typical, and it is negative to analyze main transformer of the Distribution Network Equipment in the case where meeting main transformer " N-1 " principle
Load rate.
Wherein, it directly shifts are as follows: when making " N-1 " verification to certain main transformer, which only considers by one
Secondary switch motion is transferred on each main transformer for directly having communication relationship with the main transformer.
Indirect branch are as follows: when making " N-1 " verification to certain main transformer, which first carries out once turning to supply, by institute's on-load
Be transferred in station has on the main transformer directly got in touch between station therewith；If main transformer overload, needs the sub-load that will be overloaded in standing
Being transferred between standing has therewith on other main transformers of contact.
Directly transfer and indirect branch is referring to shown in Fig. 2: No. 1 main transformer failure, directly transfer is exactly by straight with No. 1 main transformer
Connect connected 2,3, No. 5 main transformers produce the load of No. 1 main transformer.Assuming that by the load that 2,3, No. 5 main transformers produce reach No. 2 and
No. 1 main transformer still has load not produce after No. 3 rated loads.Indirect branch is exactly to meet with No. 1 main transformer with No. 2 main transformers at station
Under the premise of main transformer overload ability, No. 1 main transformer residue is given to No. 4 and No. 6 main transformers.
Typical case contact model constraint condition include:
Each main transformer capacity S is identical in substation, and interconnects between interior main transformer of standing, and low-pressure side uses in Ji Shuan main transformer substation station
Interior low-pressure side is stood using single female four section wirings by single mother partition wiring, three main transformer substations；
Service channel is identical between substation station, and can satisfy the demand turned for capacity；
The main transformer got in touch between standing is using directly transfer.
When the main transformer got in touch in standing considers overload factor k, since main transformer can only allow short-time overload, then switch through between should using
Move by the transfer of the load of overburden portion arrive at a station between have on the main transformer of contact, and after main transformer failure, after the completion of all loads transfers,
Except other main transformers of failure main transformer all reach nominal load.
Under the typical contact model, when overload factor k=1, that is, it is impermissible for overloading, can only be directly shifted, i.e.,
The load of the main transformer institute band can only be given to the main transformer directly got in touch with it, it is direct with a main transformer in typical case's contact model
The pricinpal variable of contact is n+m-2；
Defining f (m, n) is main varying load rate, and the load factor highest of main transformer can achieve:
When overload factor k > 1, as main transformer failure when, in two kinds of situation:
The first situation is ideally that overload factor is sufficiently large, can satisfy overload and requires；
When a main transformer failure in a substation, the load of the main transformer institute band can be given in typical contact model
All main transformers in addition to itself；The load factor of all main transformers is up to:
Second situation overload factor has certain limit, can not determine whether that meeting overload requires.
When a main transformer failure in a substation, the main transformer being connected directly with failure main transformer will bear failure main transformer
All loads will be more than that the load of nominal load part itself is transferred to and is connected directly with itself then by indirect branch
Non-faulting main transformer determines whether to meet the requirement of overload factor k in indirect branch, if being unsatisfactory for overload factor, it will have
Sub-load power loss.
Assuming that every main transformer all operates in the case of desired load, the jth platform main transformer failure in i-th substation, then with j
The main transformer that number main transformer is directly got in touch with reaches the load that full load is shared and isAt this point, expiring with the main transformer that j is directly got in touch with
It carries, j main transformer remaining loadBy by with it with other n-1 master in i substation
Overload load is transferred in other substations in the main transformer of underload by receiving when shortening then by indirect branch；
The overload load can indirect branch, born to be more than nominal load portion depending on every in n-1 platform main transformer
PointWhether satisfaction overload requires,
I.e.
Assuming that function g (m, n) indicate with j main transformer with i substation main transformer remove meet overload require it is remaining
Capacity, then:
As g (m, n)≤0, shows the requirement that can satisfy overload factor k when indirect branch, be equivalent to ideally mistake
It is very big to carry coefficient, as g (m, n) > 0, when showing indirect branch, the requirement of overload factor k is unable to satisfy by the main transformer for turning to supply.
Here, using specialized vocabulary only for describing the purpose of specific example embodiment, and not mean to limit
Purpose.Unless context clearly makes opposite expression, singular " one (a) " as used herein, " one (an) "
" being somebody's turn to do (the) " can mean also to include plural form.Term " including (comprises) ", " including (comprising) ",
" including (including) " and it is included in the interior meaning " with (having) ", and therefore specifies and there is stated spy
Sign, entirety, step, operation, element and/or component, but do not exclude the presence of or extraly have other spies of one or more
Sign, entirety, step, operation, element, component and/or combination thereof.Unless explicitly indicated the order executed, it is described herein
This method step, handling and operation are not interpreted as centainly needing to execute according to the specific order discussed and shown.Should also
Understand, it can be using additional or selectable step.
When element or layer be known as " ... on ", " with ... engage ", " being connected to " or " being connected to " another
Element or layer can be and engage, be connected to or couple directly on another element or layer, with another element or layer
To another element or layer, there may also be intervenient element or layers.In contrast, when element or layer are known as " straight
On connecing ... ", " with ... directly engage ", " being directly connected to " or " being directly coupled to " another element or layer, then may be used
Intervenient element or layer can be not present.Other words for being used to describe element relation should explain (example in a similar way
Such as, " ... between " and " between directly existing ... ", " adjacent " and " direct neighbor " etc.).Term "and/or" as used herein
Any and all combination of one or more including associated the enumerated project.Although may have been used art herein
Language first, second, third, etc. to describe various elements, component, regions, layers, and/or portions, these elements, component, region,
Layer and/or part are not limited by these terms.These terms can be served only for an element, component, region or part
It is distinguished with another element, component, region or part.Unless clearly showed that by context, herein using such as term " the
One ", the term of " second " and other numerical value is it is not intended that sequence or order.Therefore, lower section discuss first element, component,
Region, layer or part can be implemented using second element, component, region, layer or partial term without departing from the example
The introduction of example.
The relative terms in space, such as "inner", "outside", " below ", " ... lower section ", " lower part ", " top ",
" top " etc. can use herein for convenient for the purpose of description, to describe an element or feature as illustrated in the drawing and another
Relationship between outer one or more element or feature.The relative terms in space can mean the orientation comprising describing except the figure
Except the device different orientations.For example, if overturn the device in the figure, then it is described as " in other elements or feature
Element of the lower section " either " below element or feature " will be oriented to " in the top of other elements or feature ".Therefore,
Exemplary term " ... lower section " may include upwardly and downwardly two kinds orientations.The device can be otherwise orientated
It (be rotated by 90 ° or other are orientated) and is explained with the opposite description in space herein.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although referring to before
Stating embodiment, invention is explained in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (9)
1. a kind of main transformer desired load rate calculation method based on typical contact model, which comprises the steps of:
Step 100, define Distribution Network Equipment main transformer load directly shift and indirect branch；
Step 200, the constraint condition for determining typical contact model；
Step 300 gets in touch with model based on typical, analyzes main transformer load factor of the Distribution Network Equipment in the case where meeting main transformer " N-1 " principle.
2. a kind of main transformer desired load rate calculation method based on typical contact model according to claim 1, feature
It is, the direct transfer are as follows:
When making " N-1 " verification to certain main transformer, which only considers to be transferred to by a switch motion and be somebody's turn to do
Main transformer directly has on each main transformer of communication relationship；
The indirect branch are as follows:
When making " N-1 " verification to certain main transformer, which first carries out once turning to supply, and institute's on-load is transferred in station between station
Have on the main transformer directly got in touch with therewith；If main transformer overload in standing, need for the sub-load of overload to be transferred between station has therewith
On other main transformers of contact.
3. a kind of main transformer desired load rate calculation method based on typical contact model according to claim 1, feature
It is, the constraint condition of the typical contact model includes:
Each main transformer capacity S is identical in substation, and interconnects between interior main transformer of standing, and interior low-pressure side is stood using single mother by Ji Shuan main transformer substation
Interior low-pressure side is stood using single female four section wirings by section wiring, three main transformer substations；
Service channel is identical between substation station, and can satisfy the demand turned for capacity；
The main transformer got in touch between standing is using directly transfer.
4. a kind of main transformer desired load rate calculation method based on typical contact model according to claim 3, feature
It is, when the interior main transformer got in touch with of standing considers overload factor k, since main transformer can only allow short-time overload, then should uses indirect branch
On the main transformer for having contact between the load transfer of overburden portion is arrived at a station, and after main transformer failure, after the completion of all load transfers, remove
Other main transformers of failure main transformer all reach nominal load.
5. a kind of main transformer desired load rate calculation method based on typical contact model according to claim 4, feature
It is, under the typical contact model, when overload factor k=1, that is, is impermissible for overloading, can only directly be shifted, i.e., can only
The load of the main transformer institute band is given to the main transformer directly got in touch with it, in typical case's contact model, is directly got in touch with a main transformer
Pricinpal variable be n+m-2；
Defining f (m, n) is main varying load rate, and the load factor highest of main transformer can achieve:
6. a kind of main transformer desired load rate calculation method based on typical contact model according to claim 4, feature
Be, in the case where typical case gets in touch with model, when overload factor k > 1, as main transformer failure when, in two kinds of situation:
The first situation is ideally that overload factor is sufficiently large, can satisfy overload and requires；
Second situation overload factor has certain limit, can not determine whether that meeting overload requires.
7. a kind of main transformer desired load rate calculation method based on typical contact model according to claim 6, feature
It is, in the first case, when the load of a main transformer failure in a substation, the main transformer institute band can turn
To all main transformers in typical contact model in addition to itself；The load factor of all main transformers is up to:
8. a kind of main transformer desired load rate calculation method based on typical contact model according to claim 7, feature
It is, in the second case mentioned, when a main transformer failure in a substation, the main transformer being connected directly with failure main transformer
All loads of failure main transformer will be born, then by indirect branch, the load more than nominal load part itself will be transferred to
The non-faulting main transformer being connected directly with itself determines whether to meet the requirement of overload factor k in indirect branch, if discontented
Sufficient overload factor, it will have sub-load power loss.
9. a kind of main transformer desired load rate calculation method based on typical contact model according to claim 8, feature
Be, it is assumed that every main transformer all operates in the case of desired load, the jth platform main transformer failure in i-th substation, then with No. j
The main transformer that main transformer is directly got in touch with reaches the load that full load is sharedAt this point, expiring with the main transformer that j is directly got in touch with
It carries, j main transformer remaining loadBy by with it with other n-1 master in i substation
Overload load is transferred in other substations in the main transformer of underload by receiving when shortening then by indirect branch；
The overload load can indirect branch, born to be more than nominal load part depending on every in n-1 platform main transformerWhether satisfaction overload requires,
I.e.
Assuming that function g (m, n) indicates to remove to meet to overload with the main transformer in i substation with j main transformer to require remaining appearance
Amount, then:
As g (m, n)≤0, show the requirement that can satisfy overload factor k when indirect branch, is equivalent to ideally overload system
Number is very big, and as g (m, n) > 0, when showing indirect branch, the requirement of overload factor k is unable to satisfy by the main transformer for turning to supply.
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| CN111654021A (en) * | 2020-05-22 | 2020-09-11 | 广东电网有限责任公司东莞供电局 | Method for analyzing ideal load rate of power grid line |
| CN115085197A (en) * | 2022-08-22 | 2022-09-20 | 广东电网有限责任公司湛江供电局 | Method and system for measuring and calculating overload level of relieving main transformer through load transfer |
| CN116148575A (en) * | 2023-02-16 | 2023-05-23 | 国网湖南省电力有限公司 | Method and system for checking and analyzing main transformer N-1 of 220 kilovolt substation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111654021A (en) * | 2020-05-22 | 2020-09-11 | 广东电网有限责任公司东莞供电局 | Method for analyzing ideal load rate of power grid line |
| CN111654021B (en) * | 2020-05-22 | 2021-11-16 | 广东电网有限责任公司东莞供电局 | Method for analyzing ideal load rate of power grid line |
| CN115085197A (en) * | 2022-08-22 | 2022-09-20 | 广东电网有限责任公司湛江供电局 | Method and system for measuring and calculating overload level of relieving main transformer through load transfer |
| CN115085197B (en) * | 2022-08-22 | 2023-01-10 | 广东电网有限责任公司湛江供电局 | Method and system for measuring and calculating overload level of relieving main transformer through load transfer |
| CN116148575A (en) * | 2023-02-16 | 2023-05-23 | 国网湖南省电力有限公司 | Method and system for checking and analyzing main transformer N-1 of 220 kilovolt substation |
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