CN108649582A - A kind of distribution looped network optimal power flow control strategy based on SNOP - Google Patents
A kind of distribution looped network optimal power flow control strategy based on SNOP Download PDFInfo
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- CN108649582A CN108649582A CN201810592538.4A CN201810592538A CN108649582A CN 108649582 A CN108649582 A CN 108649582A CN 201810592538 A CN201810592538 A CN 201810592538A CN 108649582 A CN108649582 A CN 108649582A
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- China
- Prior art keywords
- snop
- flow control
- power
- looped network
- distribution
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Classifications
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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
-
- 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]
Abstract
The invention discloses a kind of distribution looped network optimal power flow control strategies based on intelligent Sofe Switch (soft normally open point, SNOP).Power distribution network based on SNOP has height self-optimization ability, can realize that power continuously adjusts, and running optimizatin is an extensive, nonlinear multi-objective optimization question.The present invention is from the characteristic of SNOP devices, on the basis of meeting system stable operation requirement, with the minimum target of power attenuation inside grid loss minimum, node voltage deviation minimum and SNOP, and this multi objective function optimization problem is changed by simple target function optimization problem by the method for weighting, to propose a kind of distribution looped network optimal power flow control strategy based on SNOP, to break through the economy bottleneck of SNOP devices application.
Description
Technical field
The present invention relates to field of power distribution, more particularly to distribution looped network optimal power flow control strategy field.
Background technology
With the extensive access of the novel loads such as high permeability, the distributed generation resource of large capacity and electric vehicle, pass
Power grid under unified central planning is faced with huge pressure and challenge.The optimal power flow control strategy of conventional electrical distribution net based on interconnection switch due to
Switch motion number and the limitation for adjusting the drawbacks such as continuity can not timely and effectively ensure the power flowcontrol effect of distribution looped network
Fruit.Intelligent Sofe Switch (soft normally open point, SNOP) is mounted to the power electronics at traditional interconnection switch
Device, the ability with height self-optimization rely on powerful power flow regulating ability, can effectively improve system run all right
Property, enhancing ability to transmit electricity.But since the cost of implementation of SNOP is higher, it can not be embodied when distribution power flow control by, which being provided purely for, answers
Use advantage.
The present invention proposes a kind of distribution looped network optimal power flow control strategy based on SNOP, is based on continuous time series,
Grid loss, load bus voltage deviation and SNOP internal power consumptions are considered, in enhancing power distribution network to distribution
While formula power supply receives ability, the overall economy quality of system operation is improved.
Invention content
Present invention solves the technical problem that being：The control strategy of the tide optimization of distribution looped network based on SNOP.It takes
Technical solution particular content is as follows：
1. the optimal load flow of the distribution looped network based on SNOP consider grid loss, node voltage deviation and
Power attenuation inside SNOP, belongs to multi-objective optimization question.
2. in order to which multi objective function optimization problem is become simple target function optimization problem, the invention patent uses weight
Three object functions of power attenuation inside grid loss, node voltage deviation and SNOP are multiplied by different power by method
It sums after weight, to realize unified modeling.
Compared with prior art the beneficial effects of the invention are as follows：
Control strategy disclosed in patent of the present invention has notable area compared with the tide optimization model of conventional electrical distribution net
Not：
1. the foundation of conventional electrical distribution pessimistic concurrency control is based on single when discontinuity surface, and the control plan disclosed in patent of the present invention
It is slightly extended in time scale, is based on continuous time series, the real-time optimization to distribution power flow of ring net may be implemented.
It is lost with via net loss minimum or node voltage deviation minimum etc. 2. conventional electrical distribution pessimistic concurrency control often ignores SNOP itself
For object function, the model of simple target is established.And consider in the method disclosed in patent of the present invention via net loss it is minimum,
Node voltage deviation is minimum and SNOP internal power consumptions are minimum, and is turned multiple target polygamma function optimization problem using the method for weighting
Multiple target list function optimization problem is turned to, to realize that via net loss, node voltage deviation, SNOP internal power consumptions are uniformly built
Mould.
3. the distribution looped network optimal power flow control strategy based on SNOP disclosed in patent of the present invention, it is contemplated that in SNOP
The power attenuation in portion, and using SNOP internal power consumptions minimum as one of object function, improve the whole warp of system operation
Ji property, has highlighted the superiority of the distribution ring network structure based on SNOP.
Description of the drawings
Attached drawing 1 is the power injection model of the distribution looped network power flowcontrol based on SNOP.
Specific implementation mode
1. the optimal load flow of the distribution looped network based on SNOP considers in via net loss, node voltage deviation and SNOP
The power attenuation in portion, belongs to multi-objective optimization question.
1) network active power loss is minimum
In formula, rl、Pl、Ql、VlIndicate impedance, active power, reactive power and the voltage of branch l；L indicates total in network
Circuitry number.
2) node voltage deviation is minimum
In formula, ViIndicate that the perunit value of node i voltage, n indicate number of nodes total in network.
3) power attenuation inside SNOP is minimum
Wherein,
In formula, m indicates that the number of VSC, m=1 indicate that VSC1 is attached to the VSC of feeder line 1, and m=2 indicates that VSC2 connects
It is connected to the VSC of feeder line 2, PSNOP,LossIndicate the internal power consumption of SNOP,Indicate the alternating current for being connected to the VSC of feeder line m
Stream,It is indicated respectively by the active power and reactive power of VSC injection feeder lines, VmIndicate exchange side terminal voltage, am、
bm、cmIndicate coefficient.
In general, am、bmCoefficient is difficult to obtain, and there was only non-loaded loss factor c in the nominal casemIt can be by manufacturer
It provides, therefore a linear function is usually taken to carry out this approximate quadratic function models：
In formula,Indicate power attenuation under rated condition,It is the alternating current of VSC under rated condition.
2. in order to which multi-objective optimization question is become simple target optimization problem, the invention patent uses the method for weighting, by net
Three object functions of power attenuation inside network loss, node voltage deviation and SNOP are summed after being multiplied by different weights, with
Realize unified modeling, i.e.,
In formula, α, β, γ are weight coefficient.
3. the optimal power flow control strategy of the distribution looped network based on SNOP need to consider following operation constraints：
1) SNOP runs constraints
In formula,The active power and reactive power of the output of the both ends SNOP are indicated respectively,The reactive power upper limit of the both ends SNOP output is indicated respectively, Connection feedback is indicated respectively
The rated power of the VSC of line 1 and feeder line 2.
2) system operation constraints
|Sl|≤|Sl,max|,l∈L
In formula, Ui、The maximum voltage of node voltage, node minimum voltage and node, S are indicated respectivelyl、
Sl,maxBranch actual capacity and the maximum capacity of branch road are indicated respectively.
4. the constraints in specific implementation method 3 is covered in object function using penalty function, abbreviation Optimized model
Afterwards, the transformed object function of Optimization without restriction direct solution (carrying penalty term) can be used.
Its mathematical model is：
In formula, k1、k2Indicate penalty factor, fSNOPIndicate the operation constraint of SNOP, fsystemThe operation of expression system constrains.
Claims (2)
1. distribution looped network optimal power flow control of the one kind based on intelligent Sofe Switch (soft normally open point, SNOP)
Strategy, it is characterised in that：Build optimal load flow model when, consider grid loss, load bus voltage deviation and
SNOP internal power consumptions build optimal control target, on the basis of ensureing system stable operation, to realize that system is integrally imitated
The maximization of benefit.
2. the distribution looped network optimal power flow control strategy according to claim 1 based on SNOP, it is characterised in that：To realize
Multi objective function optimization problem is changed into simple target function optimization problem, using the method for weighting, by grid loss, node
Three object functions of power attenuation inside voltage deviation and SNOP are summed after being respectively multiplied by different weights, unified to realize
Modeling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810592538.4A CN108649582A (en) | 2018-06-11 | 2018-06-11 | A kind of distribution looped network optimal power flow control strategy based on SNOP |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810592538.4A CN108649582A (en) | 2018-06-11 | 2018-06-11 | A kind of distribution looped network optimal power flow control strategy based on SNOP |
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| Publication Number | Publication Date |
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| CN108649582A true CN108649582A (en) | 2018-10-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810592538.4A Pending CN108649582A (en) | 2018-06-11 | 2018-06-11 | A kind of distribution looped network optimal power flow control strategy based on SNOP |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02241326A (en) * | 1989-03-10 | 1990-09-26 | Mitsubishi Electric Corp | Simulated load controller for power system |
| CN105023058A (en) * | 2015-07-07 | 2015-11-04 | 天津大学 | Power distribution network intelligent soft switch operation optimization method with simultaneous consideration of switch motion |
-
2018
- 2018-06-11 CN CN201810592538.4A patent/CN108649582A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02241326A (en) * | 1989-03-10 | 1990-09-26 | Mitsubishi Electric Corp | Simulated load controller for power system |
| CN105023058A (en) * | 2015-07-07 | 2015-11-04 | 天津大学 | Power distribution network intelligent soft switch operation optimization method with simultaneous consideration of switch motion |
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Application publication date: 20181012 |