CN108471127A - A kind of three-phase load unbalance Automatic adjustment method realized using simulation transition algorithm - Google Patents
A kind of three-phase load unbalance Automatic adjustment method realized using simulation transition algorithm Download PDFInfo
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- CN108471127A CN108471127A CN201810422435.3A CN201810422435A CN108471127A CN 108471127 A CN108471127 A CN 108471127A CN 201810422435 A CN201810422435 A CN 201810422435A CN 108471127 A CN108471127 A CN 108471127A
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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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- 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
- 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 three-phase load unbalance Automatic adjustment method realized using simulation transition algorithm, is related to the improving environment of taiwan area substation power supply quality, and in particular to the commutation adjusting apparatus and automatic adjusting method of three-phase imbalance.It is realized based on adjusting apparatus, adjusting apparatus includes host and phase-change switch, and host is mounted under distribution station transformer, and phase-change switch is mounted on three-phase and four-line and becomes on single phase power supply node, and host has communication connection with phase-change switch；Include the following steps：Step A, three-phase current is read in host timing, and calculates the degree of unbalancedness of three-phase current；Step B, host obtains the current data of each phase-change switch acquisition, and phase position is as original state residing for each phase-change switch, and corresponding phase-change switch stores current data；Step C, according to the data of storage, phase equilibrium calculating is carried out using simulation transition algorithm, obtains commutation scheme；Step D, according to result of calculation, host sends commutation to phase-change switch according to commutation scheme and instructs, and stores the phase position of each phase-change switch.By configuring suitable parameter, efficiency is far above the method for exhaustion, mitigates burden of main machine.
Description
Technical field
The present invention relates to the improving environments of taiwan area substation power supply quality, and in particular to the commutation adjustment dress of three-phase imbalance
It sets and automatic adjusting method.
Background technology
The low-voltage electricity transmission line of China is mostly three-phase four-wire power supply network, with the raising of national economy level, electric power
Net load drastically increases, especially the continuous growth of impact, nonlinear-load capacity so that it is abnormal that voltage waveform occurs for power grid
The power quality problems such as change, voltage fluctuation, flickering and three-phase load unbalance.The wherein variation of load, three-phase load unbalance
The problems such as cause electrical network negative phase-sequence voltage and negative-sequence current, seriously affect power supply quality, and then increase line loss, reducing power supply can
By property.
Low-voltage circuit radius of electricity supply is long at present, with electrodispersion, single-phase lighting consumer and the mashed up electricity consumption of three-phase power user
Situation causes threephase load extremely uneven, and line end low-voltage is serious.
In order to promote power distribution station power supply quality, it is to administer the major way of three-phase current unbalance to take commutation measure.
With the development of technology, periodic detection loading condition is now mostly used, according to line condition, control phase-change switch action is completed to change
Phase is finally reached three-phase balance.
Chinese patent application CN107196323A discloses a kind of three-phase imbalance method of controlling switch of multiple-objection optimization,
During the adjustment, the stateful carry out permutation and combination of institute of all switches is traversed whole switch change-over schemes, and deposit by controller
The corresponding three-phase current unbalance degree of all switch change-over schemes is stored up, and then carries out multiple-objection optimization.
The above method can undoubtedly find optimal commutation scheme, but with the increase of number of switches, calculation amount exponentially
Increase, great burden is brought to controller.
The load of power grid is a change procedure, reaches balance at this time, unbalanced situation is possible to again after a period of time
Secondary generation；In addition, power grid has certain tolerance to imbalance, therefore, as long as the requirement of power grid can be met, it is not necessarily intended to implement
Optimal commutation scheme.
Invention content
The purpose of the application is to provide a kind of adjustable strategies, under the premise of meeting power grid and requiring degree of unbalancedness, quickly
Realize phase adjustment.
In order to achieve the above object, the technical solution adopted by the present invention is：A kind of three realized using simulation transition algorithm
Phase load imbalance Automatic adjustment method realizes that adjusting apparatus includes host and phase-change switch, host installation based on adjusting apparatus
Under distribution station transformer, phase-change switch is mounted on three-phase and four-line and becomes on single phase power supply node, and host has logical with phase-change switch
Letter connection；The input terminal of phase-change switch connects A, B, C three-phase, and output end connects power consumer line；
Host acquires the current value of each phase of transformer, the current value of the current connection supply line of phase-change switch acquisition, and is uploaded to
Host；
The quantity of phase-change switch is 8-16；
It the described method comprises the following steps：
Step A, three-phase current is read in host timing, and calculates the degree of unbalancedness of three-phase current：B=(Imax-Imin)/Imax,
Imax is the maximum value in three-phase current IA, IB, IC in formula, and Imin is the minimum value in three-phase current；
Judge whether B is more than 15%, carries out step B if more than 15%, otherwise terminate；
Step B, host obtains the current data of each phase-change switch acquisition, and phase position is as initial shape residing for each phase-change switch
State, and corresponding phase-change switch stores current data；
Step C, phase equilibrium calculating is carried out according to the data of storage, obtains commutation scheme；
Step D, according to result of calculation, host sends commutation to phase-change switch according to commutation scheme and instructs, and stores each commutation and open
The phase position of pass.
The present invention, be by the load in the big phase of load, allotment part go load small or smaller phase up, make
Asymmetric load relative equilibrium, is realized by phase-change switch.It adjusts host and sends commutation order to phase-change switch, which opens
It closes and completes phase modulation according to the order being connected to, phase modulation process is completed in 10ms, does not influence the continuous electricity consumption of user.
The setting of phase-change switch.
Ideal state is phase-change switch to be arranged in each customer power supply circuit front end, but do not need in practice.One
Under a transformer, 8-16 phase-change switch can substantially meet each phase load balance.
The quantity of phase-change switch is set according to transformer capacity, rule of thumb, usually 100kVA is 8,125kVA
It it is 9,200kVA is 10, and 315kVA-500kVA is 12, and 630kVA is 15.
Phase equilibrium calculates.
Phase equilibrium calculating can be realized using many algorithms.In the present invention, using simulation transition algorithm.
Greedy algorithm：It selects an optimal solution as current solution from closing in solution space of currently solving every time, reaches one
The algorithm of locally optimal solution, is called greedy algorithm.Greedy algorithm implements simply, but its major defect is to be absorbed in part most
Excellent solution, and can not necessarily search globally optimal solution.As shown in Figure 1, it is assumed that C points are current solution, then soundd out since C points,
Small size movement is done to more low spot one after another, when reaching B points, exploration just finishes, because no matter to the left or right, as a result all
It is higher, finally, we have to a locally optimal solution B.
It is also a kind of greedy algorithm to simulate transition algorithm, but its search process introduces enchancement factor.Simulate transition
Algorithm finds the overall situation to receive the solution of the current solution difference of a ratio with certain probability it is therefore possible to jump out locally optimal solution
Optimal solution.
Still by taking Fig. 1 as an example, Fig. 1 is imagined as the mountain valley of a hypsography, places one block of stone in C points, then allow whole
Earthquake occurs for a mountain valley, and the degree of earthquake reduces over time, and last mountain valley restores calm.When earthquake start just
Phase, vibrations are very violent, and stone can jump in entire mountain valley.Mid-term is shaken, stone is likely to appear in B points, at this time
Vibrations degree is moderate, and stone is more likely crossed to the right in the low ebb where D points go to A points, rather than crosses E points to the left and go to
In low ebb where F points.After restoring calm, take the position where stone as last solution, then this solution there is a strong possibility just
It is globally optimal solution A points.
According to Metropolis criterion, when the liveness of system is T, the probability for the transition that energy difference is Δ E occur is P
(△ E), formula is expressed as：
P(△E)=e△E/T
Wherein e is the natural logrithm truth of a matter, △ E<0 .This formula shows that liveness is higher, and it is △ E's primary energy difference occur
The probability of transition is bigger.Formula is also shown that the absolute value of energy difference △ E is bigger, and the probability of this big energy difference transition occurs
It is more just small.
We always receive the movement to more excellent solution, and a transition process is regarded as to the movement of poor solution, shifting
Solution after dynamic and the difference that currently solves receive this movement as the energy difference △ E of transition, with probability P (△ E), that is,
It says, the process simulation of searching optimal solution is become system capacity transition phenomenon.
Simulation transition algorithm can be described with language in this way：By initial solution and initial liveness, to currently solving weight
It is multiple " to generate new explanation->Calculate the difference-of solution>Receive or abandon this solution " iteration, and liveness of gradually decaying, when algorithm end
When only, current solution is gained approximate optimal solution.
The commutation strategy of phase-change switch is substantially that load redistributes problem.By taking 16 phase-change switches as an example, it is desirable that
This 16 loads of reasonable distribution so that three-phase current unbalance degree is minimum.
Reach the commutation scheme of optimum balance degree, can only be combined to realize by exhaustive all changing, operation time
Cost can be exponentially increased with the increase of phase-change switch number, often increase a phase-change switch, time cost will
Become original 3 times.
It being required according to national grid, after phase-change switch switching, three-phase current unbalance degree need to only meet less than 15%,
It is not necessarily to minimum value degree of unbalancedness being adjusted in controlled range.
Using simulation transition algorithm proposed by the present invention, smaller calculation amount can be spent, obtains optimal solution or part most
Excellent solution meets requirement of the power grid to degree of unbalancedness.
In degree of unbalancedness minimum and the minimum the two of action frequency, the minimum priority higher of action frequency.Thus, make
It, cannot be using degree of unbalancedness as the sole indicator of evaluation when finding optimal solution with simulation transition algorithm.Therefore press following 4 principles
A set of appraisement system is designed to evaluate two states before and after Phase-switching, the score of evaluation is higher, and state is better：
Principle one:When the degree of unbalancedness of two states is both greater than 15%, the small state score higher of degree of unbalancedness.
Principle two:The degree of unbalancedness one of two states is more than 15%, and one when being less than 15%, is less than 15% state score
Higher.
Principle three:When the degree of unbalancedness of two states is both less than 15%, the few score higher of action frequency.
Principle four:The degree of unbalancedness of two states is both less than 15%, and when action frequency is identical, the small state of degree of unbalancedness
Score higher.
According to above 4 principles, the appraisement system formula designed is：
Work as umb>When 15%, judge=- (100*umb)-(100*15%*switch)
Otherwise, judge=- (99*umb)-(100*15%*step)
Wherein, umb is current phase-change switch state, i.e., the three-phase load unbalance degree of state to be evaluated, switch is total intelligence
Energy phase-change switch number, step are to transform to current phase-change switch state from original state, i.e., state to be evaluated needs to execute dynamic
The phase-change switch number of work, judge are evaluation of estimate.
It uses and states the score of appraisement system to decide whether to receive to switch the new state generated at random.
Algorithm is following below scheme.
In step C, phase equilibrium calculating is carried out using simulation transition algorithm, is included the following steps：
Step C1, initial liveness A0 is set, liveness Ae, liveness attenuation coefficient Aa are terminated；
Step C2, according to the numerical value stored in step B, the electric current summation of all phase-change switches in each phase is calculated, respectively Σ A,
ΣB、ΣC；Calculate Ia=IA- Σ A, Ib=IB- Σ B, Ic=IC- Σ C；
Calculation Estimation value J=- (100* (Imax-Imin)/Imax)-(100*15%*switch),
Switch is phase-change switch number, A=A0；
Step C3, select a phase-change switch at random, at random by the virtual commutation of the phase-change switch to other two phase wherein
One of；
Phase, current data residing for each phase-change switch after virtual commutation is stored to be stored with the conversion of phase-change switch；
Step C4, it is calculated from the data in storage after pressing this scheme commutation, the electric current summation of all phase-change switches in each phase, respectively
For Σ A ', Σ B ', Σ C ', the electric current of each phase：IA '=Ia+ Σ A ', IB '=Ib+ Σ B ', IC '=Ic+ Σ C ' calculates three-phase current
Degree of unbalancedness：Umb=(Imax '-Imin ')/Imax ', Imax ' is the maximum in three-phase current IA ', IB ', IC ' in formula
Value, Imin ' are the minimum value in three-phase current；
Calculation Estimation value judge：
Work as umb>When 15%, judge=- (100*umb)-(100*15%*switch)
As umb≤15%, judge=- (99*umb)-(100*15%*step)
Wherein, step is to transform to the phase-change switch number that current state needs execution to act from original state,
If step C5, judge>J, then J=judge, goes to step C7；It is no to then follow the steps C6；
Step C6, acceptance probability is calculated：
P=eΔjudge/A, wherein Δ judge be switch front and back evaluation of estimate difference, i.e. Δ judge=judge-J,
The random number R between 0 to 1 is sought, if P>R, then J=judge, executes step C7 and otherwise cancels the commutation scheme, restore
State to before virtual commutation executes step C7；
Step C7, current active degree A=A*Aa；
If step C8, A<Ae, currently phase residing for each phase-change switch is commutation scheme, is terminated；Otherwise, step C3 is executed.
Advantageous effect.
Using scheme proposed by the present invention, commutation is realized to phase-change switch automatically by host, makes the imbalance of its circuit
Rate drops to scheduled unbalance factor hereinafter, improving QoS of customer and power supply reliability, and then really improves voltage conjunction
Lattice rate.
By voltage and three-phase load unbalance monitoring and implement, it is contemplated that taiwan area low voltage line loss rate 5% or so can be reduced
（30% or more three-phase imbalance rate）.If the year electricity consumption of 10 taiwan areas of prepackage is 3,000,000 KWh, by load adjust automatically, often
It is 150,000 KWh that loss can be reduced year, and energy-saving benefit is calculated by 0.50 yuan/KWh, annual to save 7.5 ten thousand yuan.Expense can be saved within 5 years
With about 370,000 yuan, direct economic benefit is very huge, indirect economic benefit and social benefit then bigger.
Due to line load imbalance, it is very big to cause line load deviation, and transformer is single-phase to be in oepration at full load, becomes
Depressor will overheat, or even burn out.Using scheme proposed by the present invention, the generation of this phenomenon can be prevented.
By configuring suitable parameter, efficiency is far above the method for exhaustion.By taking 16 phase-change switches as an example：The method of exhaustion needs to count
The degree of unbalancedness and action frequency of whole more than the 4300 ten thousand kinds of assembled states of calculation, and the ginseng looked after and guided out by a large amount of analogue datas
Number (initial liveness terminates liveness, liveness attenuation coefficient) and evaluation system (find optimal solution in guarantee success rate
Probability is 99% or more) under the premise of, it executes a transition algorithm and only needs fixed 14,500 primary calculating, i.e.,
Make to be performed a plurality of times, time cost is also far below the method for exhaustion.
Description of the drawings.
Fig. 1 is the explanation figure of greedy algorithm and simulation transition algorithm,
Fig. 2 is the appraisement system diagram of the present invention,
Fig. 3 is adjusting apparatus configuration schematic diagram,
Fig. 4 is algorithm flow chart.
Specific implementation mode.
The present invention will be further described below in conjunction with the accompanying drawings.
Adjusting apparatus.
Referring to Fig. 3, a kind of three-phase load unbalance Automatic adjustment method realized using simulation transition algorithm, based on adjustment
Device realizes that adjusting apparatus includes host and phase-change switch, and host is mounted under distribution station transformer, and phase-change switch is mounted on
Three-phase and four-line becomes on single phase power supply node, and host has communication connection with phase-change switch；The input terminal of phase-change switch connects A, B, C tri-
Phase, output end connect power consumer line.
The current value of host acquisition each phase of transformer, the current value of the current connection supply line of phase-change switch acquisition, and on
It is transmitted to host.
Host is equipped with GPRS communication modules, with host computer（It is not marked in figure）Communication, other also wireless communication module, with
Wireless communication module on phase-change switch is communicated.
Ideal state is that phase-change switch is arranged in each customer power supply circuit front end, does not need in practice.One
Under transformer, the mating 8-16 phase-change switch of host can substantially meet each phase load balance.
Phase-change switch is mounted on three-phase and four-line and becomes on single phase power supply node, and supply node can be single ammeter position,
It can be the position of electricity box, there is polylith ammeter in electricity box.
The too small supply node of load, commutation influence less, balanced loaded effect, the too big power supply section of load to be not achieved
Point can cause new imbalance after commutation, therefore, in the present invention, this two classes supply node is not taken into account.
Based on considerations above following strategy is used when phase-change switch position is installed in selection：It selects in peak times of power consumption,
Three-phase and four-line of the current value between 10A to 30A becomes single phase power supply node installation phase-change switch.
In addition, it is also necessary to which the factor of consideration is：In peak of power consumption, the electric current on the node of all installation phase-change switches is total
With account for the 30% to 50% of transformer output current.
The relative value of electric current：According to history power information, when finding peak of power consumption on three-phase and four-line change single phase power supply node
Current value, wherein maximum value be IMAX, it is three between IMAX*20% to IMAX*60% to select current value when peak of power consumption
Four line of phase becomes single phase power supply node installation phase-change switch.
Phase-change switch can also be responsive to Host Command other than uploading current value, the phase position where sending it to host.
Automatic adjustment method.
Based on above-mentioned adjusting apparatus, Automatic adjustment method includes the following steps：
Step A, three-phase current is read in host timing.
According to live different situations, can daily adjust, adjustment according to the time period, the adjustment of half an hour, 15 minutes are primary, one small
When adjustment it is primary and the kinds of schemes such as adjustment are available in real time, according to Adjusted Option, host reads the time of three-phase current
It is correspondingly arranged.
Calculate the degree of unbalancedness of three-phase current：B=(Imax-Imin)/Imax, Imax is three-phase current IA, IB, IC in formula
In maximum value, Imin is the minimum value in three-phase current.
Judge whether B is more than 15%, step B is carried out if more than 15%, otherwise, circuit meets index, without adjusting,
Terminate.
Step B, host obtains the current data of each phase-change switch acquisition, and phase position is as initial residing for each phase-change switch
State, and corresponding phase-change switch stores current data.
If the current data that host obtains is in different moments, i.e., what different when discontinuity surfaces obtained, in the calculation can
There is error, certain influence is generated to result of calculation, therefore, the current data that host obtains is each phase-change switch in the same time
Section acquisition current data, this when discontinuity surface in step A host reading the when discontinuity surface of three-phase current it is identical.
Host sends test introduction to phase-change switch a little earlier or simultaneously when reading three-phase current, can obtain so big
Cause one when discontinuity surface each current value.
Phase position residing for each phase-change switch has been stored in host, and position at this time is original state, as commutation
Basis.
In host, the storage corresponding with the current value of its acquisition of each phase-change switch.
Step C, phase equilibrium calculating is carried out according to the data of storage, obtains commutation scheme.
Step D, according to result of calculation, host sends commutation to phase-change switch according to commutation scheme and instructs, and stores and respectively change
The mutually phase position of switch.
The present invention carries out phase equilibrium calculating in step C using simulation transition algorithm.
The appraisement system that the present invention uses is as shown in Figure 2：In degree of unbalancedness minimum and the minimum the two of action frequency, move
Make the minimum priority higher of number, but on condition that degree of unbalancedness is adjusted to, less than 15%, if the target is not achieved, not consider
Action frequency as possible turns degree of unbalancedness down.
Algorithmic procedure is referring to Fig. 4.
C1, initial liveness A0=200 are set first, terminate liveness Ae=0.0001, liveness attenuation coefficient Aa=
0.999。
Evaluation of estimate under C2, calculating original state（It is not provided in flow chart）.After virtual commutation, the theory in each phase
Electric current can change, also, due to not being to install phase-change switch on each user load, it calculates in each phase and owns
The electric current summation of phase-change switch, respectively Σ A, Σ B, Σ C；Calculate Ia=IA- Σ A, Ib=IB- Σ B, Ic=IC- Σ C.
Ia, Ib, Ic are the electric current summation of all loads for being fitted without phase-change switch in each phase.
Calculation Estimation value J=- (100* (Imax-Imin)/Imax)-(100*15%*switch), switch is commutation
Switch number.
It is initial liveness to set current active degree：A=A0.
C3, select a phase-change switch at random, at random by the virtual commutation of the phase-change switch to other two phase wherein
One of；After in triplicate, phase residing for each phase-change switch after virtual commutation is stored, current data is carried out with the conversion of phase-change switch
Storage.
When selecting every time, does not consider that the phase-change switch chosen is to be located at the maximum phase of electric current or minimum phase, also do not consider
Whether chosen before.When virtual commutation, do not consider that the phase being switched to is maximum current phase or minimum current phase.
It is gradually to carry out, rather than disposably choose three phase-change switches with its seasonal commutation in triplicate.Often take second place
Between do not do and evade, purpose is exactly to enhance randomness, ensures that " certain switch has switched to B phases from A phases for the first time, and second from B
Mutually switch to C phases, third time is again from C phase switchbacks A phases, and as a result the last output scheme of the step is not do to switch " this pole
End situation also has the possibility of generation.
C4, it is calculated from the data in storage by after this scheme commutation, the electric current summation of all phase-change switches in each phase is distinguished
For Σ A ', Σ B ', Σ C ', the electric current of each phase：IA '=Ia+ Σ A ', IB '=Ib+ Σ B ', IC '=Ic+ Σ C ' calculates three-phase current
Degree of unbalancedness：Umb=(Imax '-Imin ')/Imax ', Imax ' is the maximum in three-phase current IA ', IB ', IC ' in formula
Value, Imin ' are the minimum value in three-phase current.
Above current value is theoretic current value after virtual commutation.
Calculation Estimation value judge：
Work as umb>When 15%, judge=- (100*umb)-(100*15%*switch)
As umb≤15%, judge=- (99*umb)-(100*15%*step)
Wherein, step is to transform to the phase-change switch number that current state needs execution to act from original state.
If C5, judge>J illustrates that this commutation scheme is better than the scheme of front, receives this virtual commutation scheme, should
Scheme stores in step C3, and after this, the basis of virtual commutation is the virtual commutation scheme of newest receiving.J=
Judge goes to step C7；It is no to then follow the steps C6；
C6, acceptance probability is calculated：
P=eΔjudge/A, wherein Δ judge be switch front and back evaluation of estimate difference, i.e. Δ judge=judge-J,
The random number R between 0 to 1 is sought, if P>R, then receive this virtual commutation scheme, J=judge, executes step C7, no
Then, the program is cancelled, the state being restored to before this virtual commutation executes step C7；
C7, current active degree A=A*Aa；
If C8, A<Ae, current phase-change switch position are commutation scheme, are terminated；Otherwise, step C3 is executed.
In step C3, the virtual commutation basis of beginning is original state, is followed by and chooses preferably virtual commutation side
Case.
It is pseudo random number if calculating random number merely in step C6, here, plus current when calculating random number
Based on time.
Since simulation transition algorithm may not be obtained optimal solution, in order to seek best solution, carrying out every time
When phase equilibrium calculates, multiple step C can be executed, such as 2-10 times, optimal commutation scheme is chosen from the result of all execution.
Since this algorithm execution time is shorter, this selection is feasible.
Claims (8)
1. a kind of three-phase load unbalance Automatic adjustment method realized using simulation transition algorithm, is realized based on adjusting apparatus,
Adjusting apparatus includes host and phase-change switch, and host is mounted under distribution station transformer, and phase-change switch is mounted on three-phase and four-line
Become on single phase power supply node, host has communication connection with phase-change switch；The input terminal of phase-change switch connects A, B, C three-phase, output
End connection power consumer line；
Host acquires the current value of each phase of transformer, the current value of the current connection supply line of phase-change switch acquisition, and is uploaded to
Host；
It is characterized in that：The quantity of phase-change switch is 8-16；
It the described method comprises the following steps：
Step A, three-phase current is read in host timing, and calculates the degree of unbalancedness of three-phase current：B=(Imax-Imin)/Imax,
Imax is the maximum value in three-phase current IA, IB, IC in formula, and Imin is the minimum value in three-phase current；
Judge whether B is more than 15%, carries out step B if more than 15%, otherwise terminate；
Step B, host obtains the current data of each phase-change switch acquisition, and phase position is as initial shape residing for each phase-change switch
State, and corresponding phase-change switch stores current data；
Step C, phase equilibrium calculating is carried out according to the data of storage, obtains commutation scheme；
Step D, according to result of calculation, host sends commutation to phase-change switch according to commutation scheme and instructs, and stores each commutation and open
The phase position of pass；
In step C, phase equilibrium calculating is carried out using simulation transition algorithm, is included the following steps：
Step C1, initial liveness A0 is set, liveness Ae, liveness attenuation coefficient Aa are terminated；
Step C2, according to the numerical value stored in step B, the electric current summation of all phase-change switches in each phase is calculated, respectively Σ A,
ΣB、ΣC；Calculate Ia=IA- Σ A, Ib=IB- Σ B, Ic=IC- Σ C；
Calculation Estimation value J=- (100* (Imax-Imin)/Imax)-(100*15%*switch),
Switch is phase-change switch number, A=A0；
Step C3, select a phase-change switch at random, at random by the virtual commutation of the phase-change switch to other two phase wherein
One of；
Phase, current data residing for each phase-change switch after virtual commutation is stored to be stored with the conversion of phase-change switch；
Step C4, it is calculated from the data in storage after pressing this scheme commutation, the electric current summation of all phase-change switches in each phase, respectively
For Σ A ', Σ B ', Σ C ', the electric current of each phase：IA '=Ia+ Σ A ', IB '=Ib+ Σ B ', IC '=Ic+ Σ C ' calculates three-phase current
Degree of unbalancedness：Umb=(Imax '-Imin ')/Imax ', Imax ' is the maximum in three-phase current IA ', IB ', IC ' in formula
Value, Imin ' are the minimum value in three-phase current；
Calculation Estimation value judge：
Work as umb>When 15%, judge=- (100*umb)-(100*15%*switch)
As umb≤15%, judge=- (99*umb)-(100*15%*step)
Wherein, step is to transform to the phase-change switch number that current state needs execution to act from original state,
If step C5, judge>J, then J=judge, goes to step C7；It is no to then follow the steps C6；
Step C6, acceptance probability is calculated：
P=eΔjudge/A, wherein Δ judge be switch front and back evaluation of estimate difference, i.e. Δ judge=judge-J,
The random number R between 0 to 1 is sought, if P>R, then J=judge, executes step C7 and otherwise cancels the commutation scheme, restore
State to before virtual commutation executes step C7；
Step C7, current active degree A=A*Aa；
If step C8, A<Ae, currently phase residing for each phase-change switch is commutation scheme, is terminated；Otherwise, step C3 is executed.
2. the three-phase load unbalance Automatic adjustment method according to claim 1 realized using simulation transition algorithm,
It is characterized in that, the installation site of phase-change switch is according to following policy selection：In peak times of power consumption, current value is 10A to 30A for selection
Between three-phase and four-line become single phase power supply node installation phase-change switch.
3. the three-phase load unbalance Automatic adjustment method according to claim 1 realized using simulation transition algorithm,
It is characterized in that：Phase-change switch responds Host Command, the phase position where sending it to host.
4. the three-phase load unbalance Automatic adjustment method according to claim 1 realized using simulation transition algorithm,
It being characterized in that, in step B, the current data that host obtains is each phase-change switch current data that discontinuity surface acquires when same,
This when discontinuity surface in step A host read the when discontinuity surface of three-phase current it is identical.
5. the three-phase load unbalance Automatic adjustment method according to claim 1 realized using simulation transition algorithm,
It is characterized in that, in step C3, acts below in triplicate：A phase-change switch is selected at random, it is at random that the phase-change switch is virtual
Commutation is one of to other two phase.
6. the three-phase load unbalance Automatic adjustment method according to claim 1 realized using simulation transition algorithm,
It is characterized in that, in step C1, initial liveness A0=200 is set, terminate liveness Ae=0.0001, liveness attenuation coefficient Aa
=0.999。
7. the three-phase load unbalance Automatic adjustment method according to claim 1 realized using simulation transition algorithm,
It is characterized in that, in step C6, random number is found out based on current time.
8. the three-phase load unbalance Automatic adjustment method according to claim 1 realized using simulation transition algorithm,
It is characterized in that, executes 2-10 step C, optimal commutation scheme is chosen from the result of all execution.
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