CN110492504A - A kind of low-voltage power distribution station area three-phase imbalance optimization phase change method - Google Patents
A kind of low-voltage power distribution station area three-phase imbalance optimization phase change method Download PDFInfo
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- 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
A kind of low-voltage power distribution station area three-phase imbalance optimization phase change method, this method propose the average three-phase imbalance concepts based on load curve, it is horizontal to assess long-acting three-phase imbalance, using distribution network systems two-phase, three-phase load phase sequence state matrix building method, and the operating method of moving type genetic operator, construct the low-voltage network three-phase imbalance optimization commutation model based on power load indicatrix, it is exported according to power distribution station, each node power load indicatrix, a kind of calculation method of optimal access phase sequence of each commutation node load is provided, decision-making foundation is provided for live operation maintenance personnel, primary whole commutation operation may be implemented to achieve the effect that maintain long period three-phase load in a basic balance.
Description
Technical field
The present invention relates to electroporation field, especially a kind of low-voltage power distribution station area three-phase imbalance optimizes phase change method.
Background technique
Power distribution station three-phase load unbalance generates bad shadow to power distribution network power supply safety, power supply quality and economical operation
It rings, distribution transforming zero-sequence current can be caused and increase, increase, running temperature raising is lost, distribution transforming heavy-overload and " low electricity are caused when serious
Pressure " problem is one of the major embodiment of power distribution network operation weak link.
Solve the problems, such as three-phase imbalance mainly from O&M control and two dimensions of technological transformation at present.Wherein, O&M
Management and control measures run through planning and designing, construction, examination and the O&M four processes of distribute-electricity transformer district, make every effort to prevent from source uneven
The problem of generate；Technological transformation is primarily adapted for use in take operation management measure after be still difficult to the power distribution station administered.According to principle
Difference, administering method are divided into load compensation, Distribution system and phase sequence balance three classes: load compensation by increasing compensation in a network
Device compensates three alternate loads to reduce three-phase current unbalance degree, there are equipment input costs for this method greatly,
Equipment investment long operational time, operation expense are high, the disadvantages of resonance easily occurs with power grid and increases mains by harmonics；Distribution weight
Structure by block switch number available in network because limited, and network is extremely difficult to three-phase equilibrium, and distribution after switch reconfiguration
Reconstruct will change the original structure of network；Phase sequence balance, can be from root by carrying out commutation to uncompensated load or feeder line
Improve three-phase imbalance problem in sheet.
State Grid Corporation of China administer power distribution station three-phase load unbalance problem overall strategy be " O&M control based on,
Supplemented by technological transformation ", O&M control at present mostly uses experience trial-and-error method to carry out sharing of load, lacks to the outlet of platform area and commutation section
The quantitative analysis of point load can not provide optimal commutation strategy according to platform area historical load situation, and single success rate is low, manually at
This is higher.
Publication is retrieved, discovery and the maximally related following patent document of the technical program:
Low-voltage distribution system three-phase load optimization balanced arrangement method (CN109995059A) based on genetic algorithm is open
A kind of low-voltage distribution system three-phase load based on genetic algorithm optimizes balanced arrangement method, to determine in low-voltage distribution system
The binary-coded phase sequence configuration strategy that node load accesses phase sequence is decision variable, guarantees system under various wiring conditions
Topological structure having the same only changes the phase sequence configuration strategy of each node load by 0-1 logical variable value difference, with
The minimum fitness function of total line loss of all branches under load user's difference phase sequence configuration strategy, by low-voltage distribution system three-phase
Load optimal equilibrium problem is described as a mathematics optimization problem, in total line loss computation model of low-voltage distribution system all branches
In, the topological structure of circuit model is described by matrix form, keeps low-voltage distribution system three-phase load optimization balanced arrangement complete
It is converted into the mathematical problem of nonlinear optimization, and solves the problems, such as this using genetic algorithm, is not required in scheme forming process
It manually to participate in, be easily programmed realization, and algorithm is simple, what is solved the problems, such as is larger, and can provide and meet engineering reality
More excellent solution.
The method (CN110135650A) of online planning stage low-voltage distribution system three-phase load optimization balanced arrangement is open
A kind of method of online planning stage low-voltage distribution system three-phase load optimization balanced arrangement, to determine in low-voltage distribution system
Node load accesses the binary-coded phase sequence configuration strategy of phase sequence as decision variable, ensure that system in various wiring feelings
Topological structure having the same under condition, and need to only change logical variable value to change each node load phase sequence allocation plan, with
Three-phase load optimization equilibrium problem is described as a number by the minimum objective function of total degree of unbalancedness of entire low-voltage distribution system
Optimization problem is learned, establishes the mathematical model that split-phase calculates branch current, and tie by the topology that matrix form describes circuit model
Structure provides the computation model of total degree of unbalancedness, so that low-voltage distribution system three-phase load optimization balanced arrangement is fully converted to one non-
The mathematical problem of linear optimization, and this is solved the problems, such as using genetic algorithm, very important person is not required in scheme forming process in this way
Work participates in, and is easily programmed realization, and algorithm is simple, and can provide and meet the actual more excellent solution of engineering.
By the comparative analysis to patent document disclosed above, it is applicant's understanding that the application is assessing long-acting three-phase injustice
Hengshui is flat, operating method and three-phase imbalance optimization commutation model of moving type genetic operator etc. and the prior art exist compared with
Big difference, being analyzed above-mentioned patent does not influence the novelty of the application.
Summary of the invention
It is an object of the invention to provide a kind of low-voltage power distribution station area three-phase imbalance in place of overcome the deficiencies in the prior art
Optimize phase change method, this method propose the average three-phase imbalance concepts based on load curve, to assess long-acting three-phase not
Equilibrium level, using distribution network systems two-phase, the behaviour of three-phase load phase sequence state matrix building method and moving type genetic operator
Make method, the low-voltage network three-phase imbalance optimization commutation model based on power load indicatrix is constructed, for scene fortune
Dimension personnel provide decision-making foundation, primary whole commutation operation may be implemented reach to maintain long period three-phase load in a basic balance
Effect.
A kind of low-voltage power distribution station area three-phase imbalance optimization phase change method, comprising the following steps:
Step 1: reading power distribution station low-pressure side in certain time, each node load set of curves, deletes defect curve and goes forward side by side
Then row normalized obtains load characteristic curve using DBSCAN clustering algorithm.Search radius ε and most in DBSCAN algorithm
Small object number N minpts parameter is calculated as follows:
Wherein: Ndays is normal working day number of days；T is day sampling number, and this programme is taken as 96；P ' max is negative for day maximum
Lotus.
Step 2: reading low voltage power distribution network parameter, calculates Three-phase Power Flow using forward-backward sweep method, obtains distribution transformer
Low-pressure side load curve and each node voltage, current data.If the integrality of low voltage power distribution network parameter and accuracy do not have
The condition of three-phase power flow, initial distribution transformer low-pressure side load curve are obtained by step 1 method, in optimization process then
Ignore the variation of Low-voltage Line Loss caused by load adjustment, using following formula approximate calculation:
P=Pfixed+Pvariable
Wherein: P is distribution transformer low side power；Pfixed is the sum of each commutation node power；Pvariable is non-
The sum of commutation node power and low-voltage circuit transmission power.
Step 3: distribution transformer low-pressure side is calculated as follows and is averaged tri-phase unbalance factor:
Wherein: δ is average degree of unbalancedness；Pmax (i) is the i-th period of distribution transformer low-pressure side A, B, C three-phase maximum work
Rate；Pmin (i) is minimum power.
Step 4: it according to the calculation method of average tri-phase unbalance factor, establishes and is averaged three-phase with distribution transformer low-pressure side
The optimization commutation model of the minimum target of degree of unbalancedness, objective function are as follows:
Wherein: δ is that distribution transformer low-pressure side is averaged degree of unbalancedness；N is node total number；L is low pressure branch sum；cn,i
For node voltage penalty, cl, i are tributary capacity penalty, and definition is as follows respectively:
In formula: Unmax, Unmin are node n voltage bound；Plmax is the branch l tributary capacity upper limit；Wu, wp are to punish
Penalty factor.
Step 5: using genetic algorithm solving optimization commutation model, and the interchangeable phase load node in distribution network system can divide
For single-phase, positive sequence and negative phase-sequence two-phase, positive sequence and negative phase-sequence the three-phase totally 5 class feeder line way of output, for convenience of coding and genetic operator behaviour
Make, two-phase, three-phase load is disassembled into the superposition for single-phase load, and binary coding, structure are used to commutation node phase sequence state
Make phase sequence state matrix:
Wherein:B, C, i=1,2,3 ... M,Indicate load accessPhase,It indicates
Load does not accessPhase；M is equivalent commutation number of nodes, meets M=M1+2M2+3M3, M1 is single-phase commutation number of nodes, and M2 is two-phase
Commutation number of nodes, M3 are three-phase commutation node, at this time xAi+xBi+xCi=1 permanent establishment.
Step 6: to guarantee xAi+xBi+xCi=1 permanent establishment, using the method for one state displacement to commutation node phase sequence shape
State matrix selected, intersected, mutation genetic operation, and circulation executes Step 2: three, four, until searching out optimal phase sequence strategy.
Moreover, the value of the Sino-Japan sampling number T of step 1 is 96.
It advantages of the present invention and has the technical effect that
A kind of low-voltage power distribution station area three-phase imbalance of the invention optimizes phase change method, and place is normalized by step 1
It manages and obtains load characteristic curve；Three-phase Power Flow is calculated by the forward-backward sweep method of step 2, obtains distribution transformer low-pressure side
Load curve and each node voltage, current data；It is calculated by step 3 and calculates distribution transformer low-pressure side and be averaged three-phase
Degree of unbalancedness；It is established by step 4 and is averaged the optimization commutation of the minimum target of tri-phase unbalance factor with distribution transformer low-pressure side
Model；By step 5, genetic algorithm solving optimization commutation model is used to disassemble two-phase, three-phase load for the folded of single-phase load
Add, and binary coding is used to commutation node phase sequence state；Guarantee x by step 6Ai+xBi+xCi=1 permanent establishment, and with step
Rapid two, three, four circulations execute, until searching out optimal phase sequence strategy.
A kind of low-voltage power distribution station area three-phase imbalance of the invention optimizes phase change method, according to power distribution station outlet, each section
Point power load indicatrix provides a kind of calculation method of optimal access phase sequence of each commutation node load, can reach by one
The effect that secondary commutation operation maintains long period three-phase load in a basic balance, is a kind of low-voltage power distribution station with higher creativeness
Area's three-phase imbalance optimizes phase change method.
Detailed description of the invention
Fig. 1 is topological structure schematic diagram of the invention；
Fig. 2 is initial distribution low-voltage side load chart of the invention；
Fig. 3 is optimization commutation strategy schematic diagram of the invention；
Fig. 4 is distribution low-voltage side power curve schematic diagram after optimization phase sequence of the invention；
Fig. 5 is tri-phase unbalance factor curve synoptic diagram of the invention；
Fig. 6 is the logical relation schematic diagram that low-voltage power distribution station area three-phase imbalance of the invention optimizes phase change method.
Specific embodiment
For that can further appreciate that the contents of the present invention, feature and effect, the following examples are hereby given, and cooperates attached drawing detailed
It is described as follows.It should be noted that the present embodiment be it is descriptive, be not restrictive, cannot thus limit guarantor of the invention
Protect range.
A kind of low-voltage power distribution station area three-phase imbalance optimization phase change method, comprising the following steps:
Step 1: reading power distribution station low-pressure side in certain time, each node load set of curves, deletes defect curve and goes forward side by side
Then row normalized obtains load characteristic curve using DBSCAN clustering algorithm.Search radius ε and most in DBSCAN algorithm
Small object number N minpts parameter is calculated as follows:
Wherein: Ndays is normal working day number of days；T is day sampling number, and this programme is taken as 96；P ' max is negative for day maximum
Lotus.
Step 2: reading low voltage power distribution network parameter, calculates Three-phase Power Flow using forward-backward sweep method, obtains distribution transformer
Low-pressure side load curve and each node voltage, current data.If the integrality of low voltage power distribution network parameter and accuracy do not have
The condition of three-phase power flow, initial distribution transformer low-pressure side load curve are obtained by step 1 method, in optimization process then
Ignore the variation of Low-voltage Line Loss caused by load adjustment, using following formula approximate calculation:
P=Pfixed+Pvariable
Wherein: P is distribution transformer low side power；Pfixed is the sum of each commutation node power；Pvariable is non-
The sum of commutation node power and low-voltage circuit transmission power.
Step 3: distribution transformer low-pressure side is calculated as follows and is averaged tri-phase unbalance factor:
Wherein: δ is average degree of unbalancedness；Pmax (i) is the i-th period of distribution transformer low-pressure side A, B, C three-phase maximum work
Rate；Pmin (i) is minimum power.
Step 4: it according to the calculation method of average tri-phase unbalance factor, establishes and is averaged three-phase with distribution transformer low-pressure side
The optimization commutation model of the minimum target of degree of unbalancedness, objective function are as follows:
Wherein: δ is that distribution transformer low-pressure side is averaged degree of unbalancedness；N is node total number；L is low pressure branch sum；cn,i
For node voltage penalty, cl, i are tributary capacity penalty, and definition is as follows respectively:
In formula: Unmax, Unmin are node n voltage bound；Plmax is the branch l tributary capacity upper limit；Wu, wp are to punish
Penalty factor.
Step 5: using genetic algorithm solving optimization commutation model, and the interchangeable phase load node in distribution network system can divide
For single-phase, positive sequence and negative phase-sequence two-phase, positive sequence and negative phase-sequence the three-phase totally 5 class feeder line way of output, for convenience of coding and genetic operator behaviour
Make, two-phase, three-phase load is disassembled into the superposition for single-phase load, and binary coding, structure are used to commutation node phase sequence state
Make phase sequence state matrix:
Wherein:C, i=1,2,3 ... M,Indicate load accessPhase,Table
Show that load does not accessPhase；M is equivalent commutation number of nodes, meets M=M1+2M2+3M3, M1 is single-phase commutation number of nodes, M2 two
Phase commutation number of nodes, M3 are three-phase commutation node, at this time xAi+xBi+xCi=1 permanent establishment.
Step 6: to guarantee xAi+xBi+xCi=1 permanent establishment, using the method for one state displacement to commutation node phase sequence shape
State matrix selected, intersected, mutation genetic operation, and circulation executes Step 2: three, four, until searching out optimal phase sequence strategy.
Moreover, the value of the Sino-Japan sampling number T of step 1 is 96.
In addition, currently preferred, DBSCAN (Density-Based Spatial Clustering of
Applications with Noise) it is a more representational density-based algorithms.It is poly- with division and level
Class method is different, and cluster is defined as the maximum set of the connected point of density by it, can be with region division highdensity enough
For cluster, and the cluster of arbitrary shape can be found in the spatial database of noise.
Illustrate a specific embodiment of the invention to be clearer, a kind of example be provided below:
Selection Utilities Electric Co.'s three-phase imbalance power distribution station is research object, this area can be commutation node 16, are
Single-phase load is numbered according to access phase sequence, and No. 1-3 is A phase load, and No. 4-12 is B phase load, and No. 13-16 is born for C phase
Lotus, topological structure are as shown in Figure 1.Initial distribution low-voltage side load curve such as Fig. 2, calculating average tri-phase unbalance factor is 0.408.
Optimization commutation strategy such as Fig. 3 is obtained using this method.Operation maintenance personnel has carried out the adjustment of load phase sequence according to strategy, is adopted by electricity consumption
Collecting system obtains distribution low-voltage side power curve such as Fig. 4 after optimization phase sequence, calculates its three-phase not according to distribution operating standard method
Degree of balance curve such as Fig. 5, limit value of the maximum tri-phase unbalance factor lower than in distribution operating standard 0.15, it is seen that platform area three-phase is uneven
Weighing apparatus problem is effectively solved.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (2)
1. a kind of low-voltage power distribution station area three-phase imbalance optimizes phase change method, which comprises the following steps:
Step 1: reading power distribution station low-pressure side in certain time, each node load set of curves, deletes defect curve and is returned
One change processing, then obtains load characteristic curve using DBSCAN clustering algorithm.Search radius ε and minimum are right in DBSCAN algorithm
As number NminptsParameter is calculated as follows:
Wherein: NdaysFor normal working day number of days；T is day sampling number；p′maxFor Daily treatment cost.
Step 2: reading low voltage power distribution network parameter, calculates Three-phase Power Flow using forward-backward sweep method, obtains distribution transformer low pressure
Side load curve and each node voltage, current data.If the integrality of low voltage power distribution network parameter and accuracy do not have three-phase
The condition of Load flow calculation, initial distribution transformer low-pressure side load curve are obtained by step 1 method, are then ignored in optimization process
The variation of Low-voltage Line Loss caused by load adjustment, using following formula approximate calculation:
P=Pfixed+Pvariable
Wherein: P is distribution transformer low side power；PfixedFor the sum of each commutation node power；PvariableFor non-commutation node
The sum of power and low-voltage circuit transmission power.
Step 3: distribution transformer low-pressure side is calculated as follows and is averaged tri-phase unbalance factor:
Wherein: δ is average degree of unbalancedness；PmaxIt (i) is the i-th period of distribution transformer low-pressure side A, B, C three-phase maximum power；Pmin
It (i) is minimum power.
Step 4: it according to the calculation method of average tri-phase unbalance factor, establishes uneven with the distribution transformer low-pressure side three-phase that be averaged
The optimization commutation model of the minimum target of weighing apparatus degree, objective function are as follows:
Wherein: δ is that distribution transformer low-pressure side is averaged degree of unbalancedness；N is node total number；L is low pressure branch sum；cn,iFor section
Point voltage penalty, cl,iFor tributary capacity penalty, define as follows respectively:
In formula: Un max、Un minFor node n voltage bound；pl maxFor the branch l tributary capacity upper limit；wu、wpFor penalty coefficient.
Step 5: using genetic algorithm solving optimization commutation model, and the interchangeable phase load node in distribution network system can be divided into list
The totally 5 class feeder line way of output will for convenience of coding and genetic operator operation for phase, positive sequence and negative phase-sequence two-phase, positive sequence and negative phase-sequence three-phase
Two-phase, the superposition that three-phase load dismantling is single-phase load, and binary coding is used to commutation node phase sequence state, construct phase sequence
State matrix:
Wherein:The M of i=1,2,3 ...,Indicate load accessPhase,Indicate negative
Lotus is not accessedPhase；M is equivalent commutation number of nodes, meets M=M1+2M2+3M3, M1 is single-phase commutation number of nodes, and M2 changes for two-phase
Phase number of nodes, M3 are three-phase commutation node, at this time xAi+xBi+xCi=1 permanent establishment.
Step 6: to guarantee xAi+xBi+xCi=1 permanent establishment, using the method for one state displacement to commutation node phase sequence state square
Battle array selected, intersected, mutation genetic operation, and circulation executes Step 2: three, four, until searching out optimal phase sequence strategy.
2. a kind of low-voltage power distribution station area three-phase imbalance according to claim 1 optimizes phase change method, it is characterised in that: institute
The value for stating the Sino-Japan sampling number T of step 1 is 96.
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| CN111509742A (en) * | 2020-05-13 | 2020-08-07 | 广东电网有限责任公司 | Commutation method for three-phase unbalance |
| CN112909968A (en) * | 2021-01-28 | 2021-06-04 | 全球能源互联网研究院有限公司 | Low-voltage transformer area three-phase unbalance management line switching method and system |
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| CN111260198A (en) * | 2020-01-10 | 2020-06-09 | 广东电网有限责任公司 | Method and system for judging degree of rationality of line loss in transformer area synchronization and terminal equipment |
| CN111509742A (en) * | 2020-05-13 | 2020-08-07 | 广东电网有限责任公司 | Commutation method for three-phase unbalance |
| CN111509742B (en) * | 2020-05-13 | 2021-07-13 | 广东电网有限责任公司 | Commutation method for three-phase unbalance |
| CN112909968A (en) * | 2021-01-28 | 2021-06-04 | 全球能源互联网研究院有限公司 | Low-voltage transformer area three-phase unbalance management line switching method and system |
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