CN107681679A - A kind of DC distribution net breaker Optimal Configuration Method and system - Google Patents
A kind of DC distribution net breaker Optimal Configuration Method and system Download PDFInfo
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- CN107681679A CN107681679A CN201710861422.1A CN201710861422A CN107681679A CN 107681679 A CN107681679 A CN 107681679A CN 201710861422 A CN201710861422 A CN 201710861422A CN 107681679 A CN107681679 A CN 107681679A
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses a kind of DC distribution net breaker Optimal Configuration Method and system.It is certain perspective only to optimize calculating shortage with present price for dc circuit breaker at present.The technical scheme of the inventive method includes：Establish with the direct-flow distribution system year interruption cost Optimized model object function minimum with switch investment operating cost sum；Using breaker configured number as the stage, breaker allocation position is combined as state, direct-flow distribution system year, interruption cost was target function, and each stage all state index function minimums are the optimal value function in the stage, establish dc circuit breaker and distribute Dynamic Programming computation model rationally；On this basis, interval division is carried out to dc circuit breaker price；Allocation optimum scheme in different dc circuit breaker price ranges is obtained according to Dynamic Programming result.Distributing rationally for breaker provides an effective computational methods when present invention can be dc circuit breaker price change.
Description
Technical field
The present invention relates to distribution network planning technical field, specifically a kind of DC distribution net breaker side of distributing rationally
Method and system.
Background technology
Between past more than 100 years, because AC distribution has the advantages that transformation is easy, arc extinguishing is simple, all the time in electric power
Dominant position is occupied in supply.In recent years, with the continuous development of Power Electronic Technique, DC distribution is again into research heat
Point.DC distribution technology is applied to urban power distribution network, compared to exchange distribution, many technologies and economically excellent can be brought
Gesture.For example distributed power source and the switch-over unit of DC load access are saved, reduce equipment investment and change of current loss；Subtract
It is small because transmitting the idle line loss and voltage landing brought, improve power supply capacity and radius of electricity supply；It is special for sensitive load
Line is powered, and effectively improves user side quality of power supply etc..Therefore, DC distribution net becomes the important technology of urban power distribution network development
Direction.
Distributing rationally for switchgear is a nonlinear combinatorial optimization problem in distribution, and its purpose is to take into account out
Reliability benefit caused by the investment operating cost and switchgear distribution of pass, to realize the optimal of distribution system comprehensive benefit,
It can be effectively improved distribution Power System Reliability on the premise of distribution economy is ensured, subtracted by distributing rationally for switchgear
Few power-off fault economic loss to caused by power consumer.At present, in AC distribution net switching optimization method, mainly have
Several classes below：1) intelligent algorithm such as genetic algorithm, immune algorithm, ant group algorithm；2) dynamic programming algorithm；3) Tabu search algorithm；4)
MILP model solution etc..
Conventional electrical distribution net switchgear distribution method is mostly for radial ac distribution network and the exchange having been widely used
Switchgear, and in DC distribution, current most dc circuit breakers are still in development and engineer applied initial stage, its cost
To be far above conventional AC breaker, with the development of Power Electronic Technique, will there is larger cost in future after its commercial applications
Decline space, only with present price optimize calculating lack it is certain perspective.It is therefore desirable to existing power distribution network is switched excellent
Change collocation method and system carries out certain improvement, to obtain that dc circuit breaker price change can be considered during switchgear distribution
The new method and new system of factor.
The content of the invention
It is applied to the deficiency present in DC distribution net for above-mentioned existing switch optimization method, the present invention provides a kind of straight
Distribution system breaker Optimal Configuration Method is flowed, breaker distributes offer one rationally when it is dc circuit breaker price change
Effective computational methods, to be adapted to the planning and designing of Development of Power Electronic Technology stage DC distribution net.
Therefore, the present invention adopts the following technical scheme that：A kind of direct-flow distribution system breaker Optimal Configuration Method, it is wrapped
Include following steps：
1) establish with the direct-flow distribution system year interruption cost optimization mould minimum with switch investment operating cost sum
Type object function；
2) using breaker configured number as the stage, breaker allocation position is combined as state, has a power failure in direct-flow distribution system year
Failure costs is target function, and each stage all state index function minimums are the optimal value function in the stage, establish direct current
Breaker distributes Dynamic Programming computation model rationally；On this basis, interval division is carried out to dc circuit breaker price；
3) configuration scheme in different dc circuit breaker price ranges is obtained according to Dynamic Programming computation model.
As the supplement of above-mentioned technical proposal, in step 1), the calculation formula of Optimized model object function is minCA=CL+
CG, wherein, CLAnd CGRespectively direct-flow distribution system year interruption cost and switch investment operating cost.
As the supplement of above-mentioned technical proposal, in step 1), the CLCalculation formula is as follows：
In formula：nLPFor load point sum；TjFor the interruption duration classification number of j-th of load point；EENSjtFor load point j
Dead electricity amount corresponding to t class interruption durations；CLjtHave a power failure for unit corresponding to load point j t class interruption durations and damage
Lose.
As the supplement of above-mentioned technical proposal, in step 1), the CGCalculation formula it is as follows：
In formula：NSmFor switchgear distribution number；CSmFor the year value unit price such as switch investment operating cost；PSmIt is existing for switch investment
Value unit price；ρ accounts for investment cost ratio for switch operation and maintenance cost；A(i,ESm) it is recovery of the capital coefficient；I is discount rate；ESm
To switch service life.
As the supplement of above-mentioned technical proposal, in step 2), if the year such as investment operation of dc circuit breaker and disconnecting switch
Value unit price is respectively CS1、CS2；Dc circuit breaker price range is [PS1min,PS1max], it is [C that the years such as it is corresponding, which are worth unit price,S1min,
CS1max]。
As the supplement of above-mentioned technical proposal, in step 2), the calculating process of the Dynamic Programming computation model is as follows：
21) direct-flow distribution system original state target function C (0) is calculated, makes breaker configured number k=1；
22) target function of kth stage each state is calculatedAnd determine the stage optimal value functionAnd corresponding breaker configuration scheme；If Then the state is not considered further that in follow-up phase operation；
23) breaker present worth unit price critical value P corresponding when dc circuit breaker allocation optimum number is k is calculatedkFor：
In formula, A (i, ES1) be dc circuit breaker recovery of the capital coefficient；I is discount rate；ES1Used for dc circuit breaker
The time limit；
24) according to each stage critical value PkDetermine dc circuit breaker present worth unit price PS1In section [Pk+1,Pk) when it is optimal
Configured number N (PS1) it is k；
25) C if (k)-C (k+1)≤CS1min-CS2, show for PS1minConfigure k breaker when etc. year be worth total cost
It is optimal, stops configuring and going to step 26)；Otherwise, k=k+1 and step 22) is gone to；
26) dc circuit breaker price range is exported in [PS1min,PS1max] when multigroup Different Optimization configuration result.
It is a further object of the present invention to provide a kind of DC distribution net breaker Optimizing Configuration System, it includes：
1) Optimized model object function establishes unit, and it is used to establish with direct-flow distribution system year interruption cost with opening
Close the minimum Optimized model object function of investment operating cost sum；
2) dc circuit breaker distributes Dynamic Programming computing unit rationally, and it is using breaker configured number as the stage, breaker
Allocation position is combined as state, direct-flow distribution system year interruption cost be target function, each stage all state index letters
Number minimum value is the optimal value function in the stage；On this basis, interval division is carried out to dc circuit breaker price；
3) unit is distributed rationally, it, which according to dc circuit breaker is distributed Dynamic Programming computing unit rationally and obtains different direct currents, breaks
Configuration scheme in the device price range of road.
As the supplement of above-mentioned DC distribution net breaker Optimizing Configuration System, described dc circuit breaker is distributed rationally dynamic
State planning computing unit includes：
First computing unit：Direct-flow distribution system original state target function C (0) is calculated, makes breaker configured number k=
1；
Second computing unit：Calculate the target function of kth stage each stateAnd determine the stage optimal value functionAnd corresponding breaker configuration scheme；If Then the state, described C are not considered further that in follow-up phase operationS1、CS2Respectively dc circuit breaker and
The year value unit price such as investment operation of disconnecting switch；
3rd computing unit：Breaker present worth unit price corresponding when dc circuit breaker allocation optimum number is k is calculated to face
Dividing value PkFor：In formula, A (i, ES1) be dc circuit breaker recovery of the capital coefficient；I is discount
Rate；ES1For dc circuit breaker service life, ρ accounts for investment cost ratio for switch operation and maintenance cost；
Allocation optimum number decision unit：According to each stage critical value PkDetermine dc circuit breaker present worth unit price PS1In area
Between [Pk+1,Pk) when allocation optimum number N (PS1) it is k；
Optimal judging unit：C if (k)-C (k+1)≤CS1min-CS2, show for PS1minConfigure k breaker when etc. year
Value total cost has been optimal, and stops configuring and going to output unit；Otherwise, k=k+1 and the second computing unit is gone to；
Output unit：Dc circuit breaker price range is exported in [PS1min,PS1max] when distribute result rationally, it is described straight
Flow breaker price range [PS1min,PS1max] the year value unit price such as corresponding is [CS1min,CS1max]。
The present invention has the advantages that：The present invention installs number so that power distribution network synthesis is most effective for target, breaker
Mesh is the stage, breaker installation site is combined as state, establishes the improvement dynamic that DC distribution net breaker is distributed rationally and advises
The method of drawing, its model is accurate, principle is simple, and considers this factor of dc circuit breaker prices in technology evolution.It is logical
The Optimal Configuration Method of the present invention is crossed, interval division can be carried out to the dc circuit breaker price studied, and respectively obtain not
With the configuration scheme of dc circuit breaker in price range, direct-flow distribution system economy and Reliability Synthesis benefit are realized
Most preferably, it is suitable for the planning and designing of Development of Power Electronic Technology stage DC distribution net.
Brief description of the drawings
Fig. 1 is the topology diagram of DC distribution net in the embodiment of the present invention 1；
Fig. 2 is the flow chart of the Dynamic Programming computation model of the embodiment of the present invention 1.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Embodiment 1
By taking the DC distribution net topology shown in Fig. 1 as an example, optimization front each load branch circuit of case and main feeder point of intersection inlet wire
Position (sequence number 1-16) switchs with outlet position (sequence number 17-26) configuration isolation, and above disconnecting switch position can be replaced
Dc circuit breaker, distributing rationally for dc circuit breaker is now carried out using method provided by the invention.
Selected part calculating parameter is as follows in embodiment：Operation and maintenance cost ratio ρ takes 5%；Discount rate i takes 10%；If
Standby service life ESmTake 20 years；Dc circuit breaker Study on Price section is [5,45] ten thousand yuan/platform.It is then provided by the invention a kind of straight
Stream power distribution circuit breakers Optimal Configuration Method includes：
Step 1：The object function for establishing Optimized model is minCA=CL+CG.Wherein, CLAnd CGRespectively system year has a power failure
Failure costs and switch investment operating cost, can be calculated by formula 1 and formula 2：
In formula：nLPFor load point sum；TjFor the interruption duration classification number of j-th of load point；EENSjtFor load point j
Dead electricity amount corresponding to t class interruption durations；CLjtHave a power failure for unit corresponding to load point j t class interruption durations and damage
Lose；NSmFor switchgear distribution number；CSmFor the year value unit price such as switch investment operating cost；PSmFor switch time-adjusted investment unit price；ρ is
Switch operation and maintenance cost accounts for investment cost ratio；A(i,ESm) it is recovery of the capital coefficient；I is discount rate；ESmUsed for switch
The time limit.
Step 2：Establish dc circuit breaker and distribute Dynamic Programming computation model rationally：Using breaker configured number k as the stage；
X is combined with breaker allocation positioniFor state；With system year interruption costFor target function；Own with each stage
State index function minimumFor the optimal value function in the stage；
And it is respectively C to set the year value unit price such as investment operation of dc circuit breaker and disconnecting switchS1、CS2；Dc circuit breaker Study on Price area
Between be [PS1min,PS1max], it is [C that the years such as it is corresponding, which are worth unit price,S1min,CS1max]。
Step 3：Computing system original state target function C (0), makes k=1.
Step 4：Calculate the target function of kth stage each stateAnd determine the stage optimal value function C (k) and right
The breaker allocation plan answered.IfThen the state is not considered further that in follow-up phase operation.
Step 5：Calculate breaker present worth unit price critical value P corresponding when dc circuit breaker allocation optimum number is kk
For：
Step 6：According to each stage critical value PkDetermine dc circuit breaker present worth unit price PS1In section [Pk+1,Pk) when
Allocation optimum number N (PS1) it is k.
Step 7：C if (k)-C (k+1)≤CS1min-CS2, show for PS1minConfigure k breaker when etc. year be worth total cost
It has been be optimal that, stop configuring and going to step 8；Otherwise, k=k+1 and step 4 is gone to.
Step 8：Dc circuit breaker price range is exported in [PS1min,PS1max] when multigroup Different Optimization configuration result.
The dc circuit breaker that example topology is obtained according to this method distributes result rationally and is：When breaker price [38.0,
45.0] during ten thousand yuan/platform, 3 breakers should be configured in position 11,12,15；When breaker price [37.6,38.0) ten thousand yuan/platform
When, 4 breakers should be configured in position 11,12,13,15；When breaker price [34.1,37.6) ten thousand yuan/platform when, should be in place
Put 11,12,13,15,16 5 breakers of configuration；When breaker price [5,34.1) ten thousand yuan/platform when, should be in position 11~16
Configure 6 breakers.
Embodiment 2
The present embodiment provides a kind of DC distribution net breaker Optimizing Configuration System, and it includes：
1) Optimized model object function establishes unit, and it is used to establish with direct-flow distribution system year interruption cost with opening
Close the minimum Optimized model object function of investment operating cost sum；
2) dc circuit breaker distributes Dynamic Programming computing unit rationally, and it is using breaker configured number as the stage, breaker
Allocation position is combined as state, direct-flow distribution system year interruption cost be target function, each stage all state index letters
Number minimum value is the optimal value function in the stage；On this basis, interval division is carried out to dc circuit breaker price；
3) unit is distributed rationally, it, which according to dc circuit breaker is distributed Dynamic Programming computing unit rationally and obtains different direct currents, breaks
Configuration scheme in the device price range of road.
Described dc circuit breaker, which distributes Dynamic Programming computing unit rationally, to be included：
First computing unit：Direct-flow distribution system original state target function C (0) is calculated, makes breaker configured number k=
1；
Second computing unit：Calculate the target function of kth stage each stateAnd determine the stage optimal value functionAnd corresponding breaker configuration scheme；If Then the state, described C are not considered further that in follow-up phase operationS1、CS2Respectively dc circuit breaker and
The year value unit price such as investment operation of disconnecting switch；
3rd computing unit：Breaker present worth unit price corresponding when dc circuit breaker allocation optimum number is k is calculated to face
Dividing value PkFor：In formula, A (i, ES1) be dc circuit breaker recovery of the capital coefficient；I is discount
Rate；ES1For dc circuit breaker service life, ρ accounts for investment cost ratio for switch operation and maintenance cost；
Allocation optimum number decision unit：According to each stage critical value PkDetermine dc circuit breaker present worth unit price PS1In area
Between [Pk+1,Pk) when allocation optimum number N (PS1) it is k；
Optimal judging unit：C if (k)-C (k+1)≤CS1min-CS2, show for PS1minConfigure k breaker when etc. year
Value total cost has been optimal, and stops configuring and going to output unit；Otherwise, k=k+1 and the second computing unit is gone to；
Output unit：Dc circuit breaker price range is exported in [PS1min,PS1max] when distribute result rationally, it is described straight
Flow breaker price range [PS1min,PS1max] the year value unit price such as corresponding is [CS1min,CS1max]。
Although present disclosure is discussed in detail by above-described embodiment, but it should be appreciated that the description above
It is not considered as limitation of the present invention.After those skilled in the art have read the above, for a variety of of the present invention
Modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (8)
1. a kind of DC distribution net breaker Optimal Configuration Method, it is characterised in that comprise the following steps：
1) establish with the direct-flow distribution system year interruption cost Optimized model mesh minimum with switch investment operating cost sum
Scalar functions；
2) using breaker configured number as the stage, breaker allocation position is combined as state, direct-flow distribution system year loss of outage
Expense is target function, and each stage all state index function minimums are the optimal value function in the stage, establish direct current interruption
Device distributes Dynamic Programming computation model rationally；On this basis, interval division is carried out to dc circuit breaker price；
3) configuration scheme in different dc circuit breaker price ranges is obtained according to Dynamic Programming computation model.
2. DC distribution net breaker Optimal Configuration Method according to claim 1, it is characterised in that excellent in step 1)
The calculation formula for changing model objective function is minCA=CL+CG, wherein, CLAnd CGRespectively direct-flow distribution system year loss of outage
Expense and switch investment operating cost.
3. DC distribution net breaker Optimal Configuration Method according to claim 2, it is characterised in that in step 1), institute
State CLCalculation formula is as follows：
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In formula：nLPFor load point sum；TjFor the interruption duration classification number of j-th of load point；EENSjtFor load point j t
Dead electricity amount, C corresponding to class interruption durationLjtFor unit loss of outage corresponding to load point j t class interruption durations.
4. DC distribution net breaker Optimal Configuration Method according to claim 3, it is characterised in that in step 1), institute
State CGCalculation formula it is as follows：
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In formula：NSmFor switchgear distribution number；CSmFor the year value unit price such as switch investment operating cost；PSmTo switch time-adjusted investment list
Valency；ρ accounts for investment cost ratio for switch operation and maintenance cost；A(i,ESm) it is recovery of the capital coefficient；I is discount rate；ESmTo open
Close service life.
5. DC distribution net breaker Optimal Configuration Method according to claim 4, it is characterised in that in step 2), if
The year value unit price such as investment operation of dc circuit breaker and disconnecting switch is respectively CS1、CS2；Dc circuit breaker price range is
[PS1min,PS1max], it is [C that the years such as it is corresponding, which are worth unit price,S1min,CS1max]。
6. DC distribution net breaker Optimal Configuration Method according to claim 5, it is characterised in that in step 2), institute
The calculating process for stating Dynamic Programming computation model is as follows：
21) direct-flow distribution system original state target function C (0) is calculated, makes breaker configured number k=1；
22) target function of kth stage each state is calculatedAnd determine the stage optimal value function And corresponding breaker configuration scheme；IfThen exist
The state is not considered further that in follow-up phase operation；
23) breaker present worth unit price critical value P corresponding when dc circuit breaker allocation optimum number is k is calculatedkFor：
In formula, A (i, ES1) be dc circuit breaker recovery of the capital coefficient；I is discount rate；ES1For dc circuit breaker service life；
24) according to each stage critical value PkDetermine dc circuit breaker present worth unit price PS1In section [Pk+1,Pk) when allocation optimum
Number N (PS1) it is k；
25) C if (k)-C (k+1)≤CS1min-CS2, show for PS1minConfigure k breaker when etc. year value total cost reached
It is optimal, stop configuring and going to step 26)；Otherwise, k=k+1 and step 22) is gone to；
26) dc circuit breaker price range is exported in [PS1min,PS1max] when distribute result rationally.
7. a kind of DC distribution net breaker Optimizing Configuration System, it includes：
1) Optimized model object function establishes unit, and it is used to establish is thrown with direct-flow distribution system year interruption cost with switch
Provide the minimum Optimized model object function of operating cost sum；
2) dc circuit breaker distributes Dynamic Programming computing unit rationally, and it is using breaker configured number as the stage, breaker configuration
Position grouping is state, direct-flow distribution system year interruption cost be target function, each stage all state index functions are most
Small value is the optimal value function in the stage；On this basis, interval division is carried out to dc circuit breaker price；
3) unit is distributed rationally, it is distributed Dynamic Programming computing unit rationally according to dc circuit breaker and obtains different dc circuit breakers
Configuration scheme in price range.
8. DC distribution net breaker Optimizing Configuration System according to claim 7, it is characterised in that described direct current breaks
Road device, which distributes Dynamic Programming computing unit rationally, to be included：
First computing unit：Direct-flow distribution system original state target function C (0) is calculated, makes breaker configured number k=1；
Second computing unit：Calculate the target function of kth stage each stateAnd determine the stage optimal value functionAnd corresponding breaker configuration scheme；If Then the state, described C are not considered further that in follow-up phase operationS1、CS2Respectively dc circuit breaker and
The year value unit price such as investment operation of disconnecting switch；
3rd computing unit：Calculate breaker present worth unit price critical value P corresponding when dc circuit breaker allocation optimum number is kk
For：In formula, A (i, ES1) be dc circuit breaker recovery of the capital coefficient；I is discount rate；ES1For
Dc circuit breaker service life, ρ account for investment cost ratio for switch operation and maintenance cost；
Allocation optimum number decision unit：According to each stage critical value PkDetermine dc circuit breaker present worth unit price PS1In section
[Pk+1,Pk) when allocation optimum number N (PS1) it is k；
Optimal judging unit：C if (k)-C (k+1)≤CS1min-CS2, show for PS1minConfigure k breaker when etc. year value always
Expense has been optimal, and stops configuring and going to output unit；Otherwise, k=k+1 and the second computing unit is gone to；
Output unit：Dc circuit breaker price range is exported in [PS1min,PS1max] when distribute result, the direct current interruption rationally
Device price range [PS1min,PS1max] the year value unit price such as corresponding is [CS1min,CS1max]。
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