CN106849137A - A kind of three-phase imbalance adjusting method for reducing via net loss - Google Patents

A kind of three-phase imbalance adjusting method for reducing via net loss Download PDF

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CN106849137A
CN106849137A CN201710225716.5A CN201710225716A CN106849137A CN 106849137 A CN106849137 A CN 106849137A CN 201710225716 A CN201710225716 A CN 201710225716A CN 106849137 A CN106849137 A CN 106849137A
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phase
load
current
phases
module
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蒋紫薇
袁佳歆
倪周
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Wuhan University WHU
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Wuhan University WHU
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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
    • 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]
    • 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

The invention discloses a kind of three-phase imbalance adjusting method for reducing via net loss, it is characterised in that：Consider influence of influence and line loss of influence, single-phase load of the three-phase imbalance to network loss to network loss to degree of unbalancedness, propose that comprehensive minimal losses and optimal commutation operation carry out three-phase imbalance regulation weighing apparatus.The present invention is also proposed to set phase-change switch module and central control zone module during implementation method, and phase-change switch module is respectively provided with each bar load branch in power distribution network, and all phase-change switch modules are concentrated and are connected to central control zone module；The three-phase current input of phase-change switch module is connected with three-phase line, and the three-phase current output end of phase-change switch module is connected with user.The present invention saves substantial amounts of manpower and materials for supporting automatic detection in Operation of Electric Systems, improves device security and power supply reliability.

Description

A kind of three-phase imbalance adjusting method for reducing via net loss
Technical field
The invention belongs to technical field of power systems, it is related to a kind of three-phase imbalance adjusting method for reducing via net loss.
Background technology
During Operation of Electric Systems, low-voltage network three-phase load unbalance is the problem of long-term objective reality.Low-voltage distribution Frequently with three-phase four-wire power supply pattern, user is generally that single-phase load or single-phase and three-phase mix load for Netcom.Either city The loads such as illumination, water pump, the motor of the residential area of distribution, office building, or rural power grids, all show larger electricity consumption space-time special Property discreteness.The three-phase load unbalance of low-voltage network will cause line loss to increase and end appearance " low-voltage ".And with The extensive access of distributed new, the especially access of the single-phase new energy of 220V, distribution network load imbalance problem will More protrude.
Current commonly used technology is to increase reactive power compensator in user terminal and circuit.Reactive-load compensation is with reactive-load compensation Device is main body, for conventional art, can be divided into following six major class：Synchronous capacitor, fixed compensation capacitor device, saturation reactance Device (SR), mechanical switched capacitor (MSC), SVC (SVC) and static reacance generator (SVG).With near several The appearance and extensive application in year IGBT, the appearance of pulse modulation technology and phase control techniques etc. so that reactive power compensation technology is quick Development.Electrical passive filter, active power filter and unity power factor converter etc. are arisen at the historic moment.But because price is high It is expensive, the shortcomings of easily there is harmonic wave, using being very limited.
The content of the invention
In order to solve above-mentioned technical problem, the present invention provides a kind of three-phase imbalance regulation side for reducing via net loss Method.
Technical solution of the present invention proposes a kind of three-phase imbalance adjusting method for reducing via net loss, it is considered to three-phase imbalance Influence of the influence and line loss of influence, single-phase load to network loss to network loss to degree of unbalancedness, propose comprehensive minimal losses with And optimal commutation operation carries out three-phase imbalance regulation, implementation is as follows,
When load is accessed using three-phase, carry out commutation model respective objects function when three-phase imbalance is adjusted and set up such as Under,
It is provided with NtBar load branch circuit, genetic matrix is a switch phase sequence state matrix K, is expressed as follows,
Wherein, biRepresent i-th load branch circuit and access situation, switch on-off to A phases is [1 0 0]T, switching to B phases is [0 1 0]T, switching to C phases is [0 0 1]T；
(1) set before switch phase sequence do not change, flow through each phase current sum of all load branch circuit A, B, C three-phases for IOA、 IOB、IOC, average current Iave=(IOA+IOB+IOC) ÷ 3,
Current imbalance value after then adjusting is ((IA—Iave)、(IB—Iave)、(IC—Iave))
The object function for making three-phase current unbalance degree minimum is expressed as,
E1=Min { max [(IA—Iave)、(IB—Iave)、(IC—Iave)]}
(2) set switch phase sequence do not change before, initial switch phase sequence state matrix is designated as K0,
Wherein, b0iRepresent i-th initial access situation of load branch circuit；
Define miIt is i-th switch change factor of load branch circuit, if b0iEqual to bi, then mi=0；b0iIt is not equal to bi, then mi=1；
The object function for making commutation process switch adjustment least number of times is expressed as,
(3) object function for making three-phase load quantity equal is expressed as,
E3=Min { max (amountA, amountB, amountC) }
Wherein, amountA be K matrix in the first row all elements plus and, amountB be K matrix in the second row own Element plus and, amountC be K matrix in the third line all elements plus and；
When load uses single-phase access, carry out commutation model respective objects function when three-phase imbalance is adjusted and be included in Meet tri-phase unbalance factor it is of substantially equal on the premise of cause that three-phase line total losses are minimum, try to achieve IA:IB:IC, proportionally close System carries out the regulation of phase-change switch,
Wherein, IA、IB、ICTotal current respectively in the total current in A phases, the total current in B phases, C phases.
And, phase-change switch module and central control zone module are set, set respectively on each bar load branch in power distribution network Displacement phase switch module, all phase-change switch modules are concentrated and are connected to central control zone module；The three-phase electricity of phase-change switch module Stream input is connected with three-phase line, and the three-phase current output end of phase-change switch module is connected with user；
The central control zone module includes control module and carrier module, and control module and carrier module are connected；It is described Phase-change switch module includes electronic power switch unit and phase selection on-off controller unit, electronic power switch unit connection phase selection Switch controller unit；
The electronic power switch unit includes the phase-change switch of the phase-change switch, the phase-change switch of B phases and C phases of A phases, respectively The phase-change switch of phase is realized using silicon controlled rectifier (SCR) and diode.
And, it is as follows that three-phase load unbalance automatically adjusts implementation process,
Step one, setting three-phase current unbalance degree index, monitoring time interval T, three-phase current unbalance transfinite index And three-phase current unbalance degree unit timing statisticses t0；
Step 2, sets three-phase current unbalance degree monitoring timer t1It is 0, setting tri-phase unbalance factor transfinites number of times t2 It is 0；Start three-phase current unbalance degree monitoring timer t1；
Step 3, collection three-phase current data calculate degree of unbalancedness to central control zone module；
Whether step 4, judge the degree of unbalancedness of three-phase current transfinites index more than three-phase current unbalance；If not surpassing Cross, turn to step 5；If exceeding, t is made2=t2+ 1 and turn to step 6；
Step 5, judges three-phase current unbalance degree detection counter t1Value whether be more than t0If being more than, step is turned to Two, if being less than or equal to, turn to step 3；
Step 6, judging the degree of unbalancedness of three-phase current transfinites number of times t2Whether transfinited finger more than three-phase current unbalance Mark；If being not above, step 5 is turned to；If exceeding, step 7 is performed；
Step 7, gathers the electric current and phase sequence data of each load branch circuit to central control zone module, sets iterations and becomes Amount A is 0；
Step 8, starts genetic algorithm, and the dependence for being first depending on every load branch circuit correspondence threephase switch switching state is mutual Reprimand relation, is encoded with vectorial genomical way, and switch on-off to A phases is [1 0 0]T, switching to B phases is [0 1 0]T, switching It is [0 0 1] to C phasesT, randomly generate initial population, including multiple genetic matrixes；Genetic matrix is each to be classified as a load branch The switch on-off situation on road；Corresponding variation rate is set；
Step 9, computing and judgement are carried out according to commutation model respective objects function pair genetic matrix, and selection meets condition Genetic matrix, current genetic matrix is intersected, is replicated and mutation operator, form population of new generation；Sentenced again Whether disconnected iterations reaches the iterations of setting, if so, obtaining optimal commutation control instruction, then carries out step 10；If it is not, Iterations variables A=A+1 is then made, and iteration performs step 9 again；
Step 10, optimal commutation order is transferred to the phase selection of phase-change switch module on each bar load branch through carrier module Switch controller unit, control electronic power switch unit completes commutation operation；
After central control zone module receives the completion information of phase selection on-off controller unit return, stand-by period T, then return Step 2 is returned, proceeds uneven monitoring adjustment next time.
And, remotely located, carrier module is arranged near load end, is respectively changed for the control module of central control zone module Phase selection on-off controller in phase switch module is connected respectively to carrier module；The phase selection on-off controller is led to carrier module Cross RS485 or radio frequency is connected, carrier module sets up communication connection by carrier communication with control module.
And, when load uses single-phase access, there is N number of load, three-phase line conductor length resistance in establishing power network It is R, it is assumed that A, B, C three-phase load number are respectively l, and m, n are individual, and meet N=l+m+n,
For A phases, the load current respectively I on each branch road is takenA1, IA2...IAl, then the total current in A phasesAssuming that each branch road is respectively r to the distance of power distribution network power end1,r2...rl, the electric current on A phases square Value, obtains a current squaring matrixDistance on each branch road of A phases to power distribution network power end, obtain one away from From matrix r=[r1,r2,...,rl]T；
The square value of the electric current on B phases, obtains a current squaring matrixTotal current in B phasesDistance on each branch road of B phases to power distribution network power end, obtains a distance matrix s=[s1,s2..., sm]T；
The square value of the electric current on C phases, obtains a current squaring matrixTotal current in C phasesDistance on each branch road of C phases to power distribution network power end, obtains a distance matrix t=[t1,t2,...,tn]T；
In this case, A phases line lossB phase line lossesC phase line lossesThree-phase Circuit total losses
Electric current on center line
Take parameter x=max { r1,r2,...rl,s1,s2,...sm,t1,t2,...tn, then the line loss on center line
Now total losses Δ P=Δs Pφ+ΔPN。
Moreover, it is contemplated that to improve after access point apart from transformer farther out when be lost it is larger, access point away from transformer it is nearer when Loss is small, and the different load of payload is being accessed at different access points, reduces loss.
It is characteristic of the invention that considering network loss, it is contemplated that influence, single-phase load of the three-phase imbalance to network loss are to network loss Influence to degree of unbalancedness of influence and line loss.Consider the electric current that the computing of phase angle can be obtained on each section of neutral conductor of power network Breadth coefficient, so as to obtain it is load unbalanced under neutral conductor line loss.Understand that the imbalance of three-phase load is caused by calculating The increase of line loss.Therefore line loss is reduced by reducing the imbalance of three-phase load to be necessary.Of the invention Go out the relation of degree of unbalancedness and network loss, the line loss of every phase, and summation are then calculated, in tri-phase unbalance factor basis equalization Under the premise of, make total loss minimum, that is, try to achieve every phase current value i.e. optimal value in a balanced way.Invention further provides for adjusting The adjuster based on intelligent phase-change switch of whole three-phase load unbalance, by the central load unbalanced degree of control zone module monitors And phase selection switching command is sent, the information for carrying out Internet of Things with the phase-change switch module for being linked in low-voltage network three-phase line is handed over Stream, and can realize that, to load unbalanced quick response, actuation time is short, and precision is high, and a large amount of manpower and materials are saved, can have Effect safeguards power network safety operation, with important market value.
Brief description of the drawings
Fig. 1 is the adjuster device structural representation of the embodiment of the present invention.
Fig. 2 is influence schematic diagram of the three-phase imbalance of the embodiment of the present invention to network loss.
Fig. 3 is influence schematic diagram of the independent load of the embodiment of the present invention to network loss.
Fig. 4 is the electronic power switch cell schematics of the embodiment of the present invention.
Specific embodiment
Technical solution of the present invention is described in detail below in conjunction with drawings and Examples.
When the present invention is connected to power distribution network according to load by phase-change switch, the location of tie point is different, generation Loss is different, and minimal losses and optimal commutation operation should be taken into full account when proposing that three-phase imbalance is adjusted, and takes into account two aspects, obtains Go out optimal commutation solution, form corresponding commutation operational order, commutation operation is completed by switching, improve three-phase imbalance and ask Topic.
Further, the present invention is proposed：When carrying out three-phase imbalance regulation, access point of the load in power distribution network is taken into full account Loss produced by difference is different, not exclusively only considers to improve three-phase imbalance problem, while being accessed after considering to improve Point apart from transformer farther out when be lost larger, access point is lost small problem away from transformer when nearer, therefore, it can to consider away from The different load of payload is accessed away from different access points, loss is reduced, and combination carries out three-phase imbalance regulation by three Phase imbalance problem optimizes.
Further, the present invention is proposed：Carry out combining Load flow calculation when three-phase imbalance is adjusted, fully calculate different accesses The network loss of point, using the network loss of optimal commutation solution reduction circuit, reduces the input cost of power network.
Specific network loss influence considers as follows：
1. the line loss of low-voltage network
The voltage of low-voltage network is low, does not have corona phenomenon, and the loss of circuit is largely the heating loss of resistance, It is explicit physical meaning to hence set up the line loss calculation on the basis of resistance fuel factor.Resistance fuel factor and resistance and electric current Size it is relevant, and the size of phase and voltage with electric current and phase are unrelated, therefore for phase line, set up in resistance and Line loss calculation on the basis of size of current is reliable.For the neutral conductor, because its electric current for carrying is the phasor of three-phase current With, therefore should both consider the imbalance of size of current, it is further contemplated that current phase angle is asymmetric.In general, the voltage of power supply Substantially sine wave, its phase angle is almost symmetry, while think electric current substantially sine wave, so by considering the fortune of phase angle Calculation can obtain the breadth coefficient of electric current on each section of neutral conductor of power network, so as to obtain it is load unbalanced under neutral conductor line Damage.
2. influence of the three-phase imbalance to network loss
During three-phase load unbalance, the load current of each phase is unequal, just generates out-of-balance current alternate, and these are not Balanced balanced current will also cause loss in addition to loss is caused in phase line on the neutral conductor, increased total line loss.Wiring such as explanation Shown in book accompanying drawing 2, wherein, I1, I2, I3 represent that load 1 accesses A respectively, when B, C three-phase, the electricity of load 1 are each flowed on three-phase Stream；I4, I5, I6 represent that load 2 accesses A respectively, when B, C three-phase, the electric current of load 2 are each flowed on three-phase；I7, I8, I9 point Not Biao Shi load 3 access A, when B, C three-phase, the electric current of load 3 is each flowed on three-phase.Hereafter only consider the three-phase of single load The influence of current imbalance relation pair via net loss.
If three-phrase burden balance, vector difference is zero, i.e.,
IA+IB+IC=0
Wherein, IA、IB、ICRepresent A respectively, the electric current flowed through on B, C three-phase and.
Assuming that certain three-phase four-wire circuit total load is 3I (total current that i.e. A, B, C three-phase flow through be 3I), phase line and in Property line resistance be all R, then during three-phase equilibrium line power loss be
Δ P=3I2R
Work as three-phase load unbalance, it is assumed that wherein a specific electric load isOther two specific electric load isNow understand center line Electric current is
Wherein, INIt is current in middle wire.
Now line power is lost and is
Wherein, Δ P is line power loss.
Understood by calculating, in this case, when line loss is changed into three-phrase burden balanceTimes, i.e. three-phase The imbalance of load causes the increase of line loss.
Ordinary circumstance is generalized to, that is, is considered a wherein specific electric load for xI, a specific electric load is yI, a specific electric load is zI, On the premise of it there is x+y+z=3, can now try to achieve current in middle wire is
Now line power is lost and is
In coefficient x >=0, y >=0, under the restrictive condition of z >=0 (x+y≤3), it is known that in the limiting case, whole loads by During one power supply, power attenuation is to the maximum
ΔPmax=(3I)2R × 2=18I2R
Wherein, Δ PmaxIt is power attenuation maximum.
I.e. now line loss be changed into threephase load balance when 6 times, this is obviously with the transmission of electric energy to the quality of power supply It is unfavorable, therefore reduce line loss by reducing the imbalance of three-phase load and be necessary.The present invention is proposed, by adjusting Section phase-change switch causes that three-phase load is evenly distributed as far as possible.
3. the relation of line loss and degree of unbalancedness
Load current degree of unbalancedness is commonly defined as
Degree of unbalancedness per phase load electric current is defined as
Wherein ImaxφIt is the maximum of maximum phase load electric current, i.e. phase current, represents Imax A, Imax B, Imax COne of； Imax A, Imax B, Imax CRefer to A phase, B phase, C phase load maximum current.IavRefer to average load electric current, and
The definition of phase degree of unbalancedness is
Wherein, IφIt is phase current, represents IA、IB、ICOne of.
From above formula, Iφ=(1+ β) Iav, due to IφSpan be 0~3Iav, so degree of unbalancedness βφChange Scope is-1-2, and there is following relation：
βA+βB+βC=0
It is now assumed that the phase line resistance of three-phase four-wire circuit is all R with neutral line resistance, each phase power factor is identical, then During three-phase imbalance, the power attenuation of phase line is
Abbreviation understands
Known by Kirchhoff's current law (KCL), neutral current square is
Arrange：
Now there is the line loss on the neutral conductor
So total losses are
4. influence of the independent load to network loss
When load is accessed using three-phase, for a certain independent load, power distribution network power end is arrived between its A, B, C three-phase Distance can approximately be regarded as equal；When load uses single-phase access, due to the randomness of power load distributing, the phase of different two-phases is accessed Certain distance is there is between adjacent load, i.e., compared with three-phase accesses load, single-phase access load can have more one it is adjacent two negative Line loss between lotus distance.It follows that the via net loss that general three-phase accesses load is damaged than the network of single-phase access load Consumption is low.
Now consider for independent load to access each phase, and load distance is 1 between any two.As shown in Figure 3, it is assumed that have 9 loads, the electric current flowed through on its circuit respectively I1, I2, I3, I4, I5, I6, I7, I8, I9, represent single-phase access respectively The electric current that is flowed through of each load.Wherein known by Kirchhoff's current law (KCL)
A phase currents IA=I1+I6+I8
B phase currents IB=I2+I4+I9
C phase currents IC=I3+I5+I7
It is assumed that the unit resistance on phase line and the neutral conductor is R, A, the line loss Δ P of B, C three-phase now can be respectively tried to achieveA, ΔPB,ΔPC, you can know
A phase line losses
B phase line losses
C phase line losses
In this case, there is three-phase line loss
By Kirchhoff's current law (KCL), current in middle wire can be tried to achieve
Loss on old friend's neutral conductor
Now total loss
Δ P=Δs Pφ+ΔPN
Meeting, tri-phase unbalance factor is of substantially equal, i.e. Δ PA=Δ PB=Δ PCOn the premise of so that total loss Δ P Minimum, now tries to achieve IA：IB：ICAs optimal solution.
According to the proportionate relationship tried to achieve, cause that three-phase load is distributed by the regulation of phase-change switch and meet its ratio as far as possible Example.
Usually, it is considered to there is N number of load in actual power distribution network, because three-phase line wire material therefor is identical, can set Its unit length resistance is R.Assuming that A, B, C three-phase load number are respectively l, m, n are individual, and meet N=l+m+n.For A phases For, take the load current difference I on its each branch roadA1, IA2...IAl, then the total current in A phasesAssuming that each Road is respectively r to the distance of power distribution network power end1,r2...rl.The square value of the electric current on A phases, can obtain a current squaring square Battle arrayDistance on each branch road of A phases to power distribution network power end, same writeable distance matrix r= [r1,r2,...,rl]T。
Similarly, the square value of the electric current on B phases, can obtain a current squaring matrixIn B phases Total currentDistance on each branch road of B phases to power distribution network power end, same writeable distance matrix s=[s1, s2..., sm]T.The square value of the electric current on C phases, can obtain a current squaring matrixIn C phases Total currentDistance on each branch road of C phases to power distribution network power end, writeable distance matrix t=[t1, t2,...,tn]T。
In this case, A phases line lossB phase line lossesC phase line lossesI.e. three Phase line total losses
Known by Kirchhoff's current law (KCL), electric current on center line
Take parameter x=max { r1,r2,...rl,s1,s2,...sm,t1,t2,...tn, then the line loss on center line
Now total loss Δ P=Δs Pφ+ΔPN
Meeting, tri-phase unbalance factor is of substantially equal, i.e. Δ PA=Δ PB=Δ PCOn the premise of so that total loss Δ P Minimum, now tries to achieve IA:IB:ICAs optimal solution.Cause that three-phase load is distributed by the regulation of phase-change switch and meet it as far as possible Proportionate relationship.
For the sake of ease of implementation, present invention further propose that a kind of adjuster device, referring to Fig. 1, the present invention is implemented The adjuster device of example, including phase-change switch module (M in such as Fig. 1) and central control zone module (N in such as Fig. 1), phase-change switch Module is connected with central control zone module, and the three-phase current input of phase-change switch module is connected with three-phase line, and commutation is opened The three-phase current output end for closing module is connected with user.During specific implementation, can be according to specific loaded line situation, in power distribution network In phase-change switch module is respectively provided with every load branch, all phase-change switch modules are concentrated and are connected to central control zone mould Block.
The central control zone module includes control module, carrier module, and control module and carrier module are connected；It is described to change Phase switch module includes electronic power switch unit, phase selection on-off controller unit, and electronic power switch unit connection phase selection is opened Gateway controller unit.Phase selection on-off controller may be referred to simply as SCU.
The control module of the central control zone module can be realized using existing digital signal processing chip.Preferably, Embodiment uses TMS320LF2407A chips.
Referring to Fig. 4, the electronic power switch unit of the phase-change switch module includes contactor K1、K2、K3, diode V1、 V2、V3、V4、V5、V6、V7、V8、V9、V10、V11、V12, silicon controlled rectifier (SCR) KA1、KA2、KA3、KA4、KA5、KA6, by controlling three-phase The break-make of silicon controlled rectifier (SCR) and diode on circuit realizes commutation；The phase-selecting switch control of the phase-change switch module Device can be realized using existing feeder terminal unit.Preferably, embodiment uses FTUSY20 devices.
The other phase-change switch structure of three-phase separate is identical, such as described silicon controlled rectifier (SCR) KA3Respectively with a diode V3Instead To parallel connection, and connect again one with silicon controlled rectifier (SCR) direction identical diode V9, constitute a circuit topological structure P1；Institute State circuit topological structure P1The circuit topological structure P that but power electronic devices direction identical with another structure is completely reversed2, connect Tentaculum K2Parallel connection, collectively forms the phase-change switch of a phase.
That is silicon controlled rectifier (SCR) KA3Anode and a diode V3Negative electrode all connects the three-phase current of phase-change switch module Input, silicon controlled rectifier (SCR) KA3Negative electrode and a diode V3Anode all connects diode V9Anode, constitute an electricity Road topological structure P1；Another silicon controlled rectifier (SCR) KA4Negative electrode and a diode V4Anode all connects phase-change switch module Three-phase current input, silicon controlled rectifier (SCR) KA4Anode and a diode V4Negative electrode all connects diode V10Negative electrode, structure Into a circuit topological structure P2；P1、P2With contactor K2Parallel connection, collectively forms the phase-change switch of a phase；
Similarly, silicon controlled rectifier (SCR) KA3Anode and a diode V3Negative electrode all connects the three-phase electricity of phase-change switch module Stream input, silicon controlled rectifier (SCR) KA3Negative electrode and a diode V3Anode all connects diode V9Anode, constitute one Circuit topological structure；Another silicon controlled rectifier (SCR) KA4Negative electrode and a diode V4Anode all connects phase-change switch module Three-phase current input, silicon controlled rectifier (SCR) KA4Anode and a diode V4Negative electrode all connects diode V10Negative electrode, structure Into another circuit topological structure；Two circuit topological structures and contactor K2Parallel connection, collectively forms the phase-change switch of a phase；
Silicon controlled rectifier (SCR) KA5Anode and a diode V5The three-phase current that negative electrode all connects phase-change switch module is defeated Enter end, silicon controlled rectifier (SCR) KA5Negative electrode and a diode V5Anode all connects diode V11Anode, constitute a circuit Topological structure；Another silicon controlled rectifier (SCR) KA6Negative electrode and a diode V6Anode all connects the three-phase of phase-change switch module Current input terminal, silicon controlled rectifier (SCR) KA6Anode and a diode V6Negative electrode all connects diode V12Negative electrode, constitute another One circuit topological structure；Two circuit topological structures and contactor K3Parallel connection, collectively forms the phase-change switch of a phase.
Present invention further propose that, the leading-out terminal of electronic power switch unit is arranged in series current transformer TA.It is described to change Phase selection on-off controller in phase switch module connects electronic power switching circuit, carrier module and current transformer respectively TA.Current transformer TA connects in electronic power switch leading-out terminal, and is connected by low-voltage circuit with phase selection on-off controller, electricity The result of current transformer TA monitoring load currents uploads to the control module of central control zone module, branch through phase selection on-off controller Holding carries out system mode judgement.During specific implementation, it is also possible to utilize other existing current acquisition equipment.
During specific implementation, the control module of central control zone module can be remotely located, and carrier module is arranged on load end Near, the phase selection on-off controller in each phase-change switch module is connected respectively to carrier module.The phase selection on-off controller with Carrier module is connected by RS485 or radio frequency, and carrier module sets up communication connection by carrier communication with control module, carries out Information is exchanged.In embodiment, in the phase selection on-off controller of the phase-change switch module (M) and central control zone module (N) Carrier module be connected by serial ports RS485, the phase selection on-off controller and phase-change switch mould of the phase-change switch module (M) The phase-change switch of the three-phase of block (M) is connected by low-voltage circuit.For example, electronic power switch unit is low by A, B, C three-phase Pressure wire is connected with 380V low-voltage distribution transmission lines of electricity, and is controlled again by A, B, C three-phase low-voltage wire and phase-selecting switch Device is connected, and carries out contactor KA1、KA2、KA3Break-make control.Can be by because of the rapidity of electronic power switch, when carrying out commutation Actuation time is controlled within 5ms.Carrier module circuit enters row information and exchanges by carrier communication and control module, obtains phase selection Switching command, and pass to phase selection on-off controller.Current transformer of the phase selection on-off controller from before electronic power switch Signal is received, and phase selection switching command is received by carrier module, produce control signal to contactor KA1、KA2、KA3Break-make Control, and coordinate diode and silicon controlled rectifier (SCR), carry out commutation operation.
Carrier module in central control zone module (N) is responsible for collecting the three-phase current data of distribution transformer low-pressure side, Control module is issued by carrier communication, control module is analyzed calculating, form optimal " imbalance regulation strategy ", and will life Order is issued to phase-change switch module (M), carries out Load Regulation.Platform area controller is held by the multiobjective optimization commutation model set up Row algorithm, and phase-change switch execution is handed down to by carrier module.
The embodiment of the present invention proposes the optimal correction scheme based on above-mentioned adjuster device, including the preproduction phase and moves certainly Phase implementation phase, flow is mainly performed in the control module of central control zone module, is carried out as follows：
Step one：Setting three-phase current unbalance degree index, monitoring time interval T, three-phase current unbalance transfinite index, And three-phase current unbalance degree unit timing statisticses t0；During specific implementation, those skilled in the art can voluntarily preset and specifically take Value.
During specific implementation, can first power-on self-test survey whether instrument malfunctions, if error, controller locking, record failure, treat Restart again after fixing a breakdown, and repeat step one；If it is error-free, then set.
Step 2：Three-phase current unbalance degree monitoring timer t is set1It is 0, setting tri-phase unbalance factor transfinites number of times t2 It is 0；Start three-phase current unbalance degree monitoring timer t1。
Step 3：Collection three-phase current data calculate degree of unbalancedness to central control zone module, and specific calculation can Referring to concerned countries standard, it will not go into details for the present invention.
Embodiment gathers distribution low-voltage side three-phase current data by current transformer TA, obtains flowing through each bar load branch circuit Electric current.Present invention setting one user of low-voltage network has a phase current to have only with the electricity of a phase in that is, every load branch circuit Numerical value, other biphase currents are zero.
Step 4：Whether judge the degree of unbalancedness of three-phase current transfinites index more than setting value, i.e. three-phase current unbalance； If being not above, step 5 is turned to；If exceeding, current tri-phase unbalance factor is transfinited number of times t2Numerical value increases by 1 (i.e. t2=t2+ 1) and step 6 is turned to.
Step 5：Judge three-phase current unbalance degree detection counter t1Value whether be more than t0If being more than, step is turned to Two, if being less than or equal to, turn to step 3.
Step 6：Judging the degree of unbalancedness of three-phase current transfinites number of times t2Whether transfinited finger more than three-phase current unbalance Mark；If being not above, step 5 is turned to；If exceeding, step 7 is performed.
Step 7：Gather the electric current and phase sequence data of each load branch circuit to central control zone module；Iterations is set to become Amount A is 0；Subsequently into step 8, start to perform genetic algorithm.Embodiment gathers distribution low-voltage again by current transformer TA Side three-phase current data, obtain the electric current and phase sequence data of each load branch circuit.
Step 8：Start genetic algorithm, the dependence for being first depending on every load branch circuit correspondence threephase switch switching state is mutual Reprimand relation, is encoded with vectorial genomical way, and switch on-off to A phases is [1 0 0]T, switching to B phases is [0 1 0]T, switching It is [0 0 1] to C phasesT, randomly generate initial population, including multiple genetic matrixes；Genetic matrix is each to be classified as a load branch The switch on-off situation on road；Corresponding variation rate is set.
Step 9：With fitness function value, (embodiment is made using three commutation model respective objects functions described hereinafter It is condition) computing and judgement are carried out to genetic matrix, selection meets the genetic matrix of condition, current genetic matrix is handed over Fork, duplication and mutation operator.Intersection is that the Partial Fragment of initial gene matrix is interchangeable, and constitutes new matrix；Duplication is Data excellent in initial gene matrix are carried out to remain into next step computing；Variation be row in initial population genetic matrix to Amount is in [1 0 0]T、[0 1 0]T、[0 0 1]TChange in three column vectors.Intersection has been carried out successively, replicated and variation fortune Calculate, form population of new generation.Carry out judging whether iterations reaches the iterations of setting again, if so, obtain each low pressure bearing The optimal commutation control instruction of the on-line automatic commutation device of lotus, then carry out step 10；If it is not, iterations variables A=A+1 is then made, And iteration performs step 9 again.
Step 10：Optimal commutation order is communicated by GPRS and is transferred to carrier module, and be transferred to by serial ports RS485 The phase selection on-off controller unit of phase-change switch module on each bar load branch.
The optimal commutation order that the control module of central control zone module is obtained is transferred to phase selection on-off controller unit, choosing Phase switch controller unit internally carries out data processing, and commutation is operated successfully, and commutation success is sent to central control zone module Information.
N set commutation switch modules are provided with, control module sends to the phase selection on-off controller unit of each phase-change switch module Whether the electronic power switch unit of commutation specific instructions, i.e., the 1st ... i ... n phase-change switch modules needs to carry out commutation operation, I ... the n electronic power switch units that are to send optimal commutation control to instruct to the 1st ..., control electronic power switch unit is complete Into commutation operation；The value of i is 1 to the integer between n.Using this intelligentized design, visual each electronic power switch list Unit is automatic commutation device.
After central control zone module receives the completion information of phase selection on-off controller unit return, stand-by period T, then return Step 2 is returned, is proceeded uneven monitoring next time and is adjusted.
The genetic algorithm corresponds to the dependence mutex relation of threephase switch switching state according to every load branch circuit, with vector Genomical way is encoded, and constitutes sole matrix；Optimal commutation mode is finally given by crossover operator, mutation operator, duplication. The power electronics unit of the phase-change switch module sends commutation specific instructions and refers to the silicon controlled rectifier in electronic power switch Device sends the concrete signal of trigger pulse or shut-off trigger pulse, and contactor is equally sent is turned on or off signal.
Further, the present invention proposes that according to different operating target various commutation models can be set up, when load uses three-phase During access, carry out commutation model respective objects function when three-phase imbalance is adjusted and set up following 3 kinds：
1st, three-phase current unbalance degree is minimum.
For NtThe system of bar load branch circuit, then be provided with n=NtSet commutation switch module (M), each load branch circuit correspondence Switch whether switching is to just corresponding with a binary coding in certain phase in A, B, C three-phase, set up that line number is 3 one (switch on-off to A phases is [1 0 0] to switch phase sequence column vector bT, switching to B phases is [0 1 0]T, switching to C phases is [0 01 ]T)；
If genetic matrix is a switch phase sequence state matrix K, it is expressed as follows,
Note：biRepresent i-th load branch circuit and access situation.
According to upper, if before switch phase sequence does not change, all load branch circuits correspond to an initial switch phase sequence state matrix, It is designated as K0.K0 columns is Nt, line number is 3；
Note：b0iRepresent i-th initial access situation of load branch circuit.
Current matrix I, I line number are set up for N according to load branch circuit electric currentt, columns is 1；Each phase current sum is represented by Switch phase sequence state matrix multiplies with the difference of current vector, realizes as follows
Add up to NtBar load branch circuit；If corresponding flow through i-th electric current of load branch circuit respectively Ii, then constitute following Current matrix I：
Then each phase current sum multiplies for the difference of K and I：
Wherein, IAIt is A phase currents and IBIt is B phase currents and ICFor C phase currents and.
If corresponding to flow through i-th electric current of load branch circuit respectively I0 before switch phase sequence does not changei, then under constituting Row current matrix I0：
Each phase current sum of all load branch circuit A, B, C three-phases is flowed through to be represented by switching phase sequence state matrix K0 and electric current The difference of vectorial I0 multiplies：
If average current Iave=(IOA+IOB+IOC)÷3
It is ((I then to seek the current imbalance value after adjustmentA—Iave)、(IB—Iave)、(IC—Iave))
Make three-phase current unbalance degree minimum, correspondence switch matrix K can be found, make difference minimum.Therefore, three-phase electricity is made The minimum object function of stream degree of unbalancedness is expressed as：
E1=Min { max [(IA—Iave)、(IB—Iave)、(IC—Iave)]}
2nd, commutation process switch adjustment least number of times.
For NtThe system of bar load branch circuit, with 1, sets up K matrix,biRepresent i-th Bar load branch circuit accesses situation；
Initial switch phase sequence state matrix is designated as K0,b0iI-th is represented to bear The initial access situation of lotus branch road；
Define miIt is i-th switch change factor of load branch circuit (if b0iEqual to bi, then mi=0；b0iIt is not equal to bi, then mi=1)；All loads are set up with 1 switch change factor matrix M, M columns for Nt, line number is 1；
All load master switch adjustment number of times summations；
Commutation process is set to switch adjustment least number of times it is necessary to make c values minimum.Therefore, commutation process is made to switch adjustment time The minimum object function of number is represented by：
3rd, three-phase load quantity is equal.
For NtThe system of bar load branch circuit, K matrix is set up with 1,biRepresent i-th Load branch circuit accesses situation；
Initial switch phase sequence state matrix is designated as K0,b0iI-th is represented to bear The initial access situation of lotus branch road；
A, B, C phase load number are calculated respectively：
The line number of K matrix is 3, make amountA in K matrix the first row all elements plus and, amountB is K matrix In the second row all elements plus and, amountC be K matrix in the third line all elements plus and.
Make three-phase load number equal minimum it is necessary to maximum in making three-phase.Therefore, the mesh for making three-phase load quantity equal Scalar functions are represented by：
E3=Min { max (amountA, amountB, amountC) }
When load uses single-phase access, commutation model respective objects function when three-phase imbalance is adjusted is carried out except bag Include meet tri-phase unbalance factor it is of substantially equal on the premise of cause that three-phase line total losses are minimum, try to achieve IA:IB:IC, according to than Example relation carries out the regulation of phase-change switch, it is also possible to be considered as similar with the basic condition that three-phase is accessed, and considers three of the above Object function.
The course of work is：When the three-phase load unbalance degree of distribution box reaches certain threshold value, central control zone module By analysis, commutation order is sent to phase-change switch module, phase-change switch module is carried out commutation operation；The order passes through low pressure Circuit passes to phase selection on-off controller unit, and now phase selection on-off controller unit can gather the three-phase at current transformer TA Load current data, to support to carry out system mode judgement；Central control module calculates the Optimal Load of minimum switching times Commutation scheme；When carrying out commutation operation, it is assumed that from M phases commutation to N phases (in order to describe conveniently with M, N phase instead of in A, B, C phase One phase, and M and N represent different phases), M phase contacts conducting before commutation, M phases IGCT and diode combinations topological circuit are disconnected Open, N phase contacts and N phases IGCT, diode combinations topological circuit disconnect.When carrying out commutation, first to two brilliant locks of M phases Pipe trigger signal is turned it on, and disconnects M phase contacts, now because voltage can be by the two of M phases sides with the positive and negative of electric current To opposite IGCT and diode topological structure, it is ensured that the continuity of electricity consumption；Now triggering two IGCTs of N phases again leads it It is logical, do not provide trigger pulses to two IGCTs of M phases and turn it off, now just by load commutation to N phases, and electric current is by N The opposite IGCT of the both direction of phase and the circulation of diode topological structure.For guarantee electrical stability and fever time is reduced, The contactor of N phases is turned on, and no longer gives the IGCT hair trigger signal of N phases, now electric current is turned on by the contactor of N phases, so far, Complete commutation task.
For example from the commutation of A phases to B phases：A phase contacts (K before commutation1) conducting, A phases IGCT, diode combinations topology electricity Road, B phase contacts (K2) and B phases IGCT, diode combinations topological circuit disconnect.When carrying out commutation, first to KA1, KA2 Trigger signal is turned it on, and disconnects contactor K1, now because voltage can be by different path KA from the positive and negative of electric current1, V1Or KA2, V2, it is ensured that the continuity of electricity consumption；KA is now triggered again3, KA4Turn it on, and no longer give KA1, KA2There is provided trigger signal makes Its shut-off, now just by load commutation to B phases.For guarantee electrical stability and reduce fever time, control contactor K2Lead It is logical, just can now complete commutation operation.
So when three-phase load unbalance needs to carry out commutation operation, during electronic power switch is acted, use Family end does not feel as the generation of power failure, improves power supply reliability, because electronic power switch has larger switching speed, Visual response time of its actuation time much smaller than people；Simultaneously, it is to avoid make when commutation is operated two-phase to be also turned on Cause phase fault, power network is adversely affected, diode has one-way conduction.
The present invention using electronic power switch unit as phase-change switch module main body, and by phase-change switch module with Central control zone module by way of Internet of Things is connected, voluntarily run by control module, supports that user freely sets imbalance Degree nargin and the number of times that transfinites, greatly expand range of application；Meanwhile, in Operation of Electric Systems, automatic detection can be accomplished, it is fixed When regulate and control, save substantial amounts of manpower and materials, it is to avoid because of the hidden danger that manual control brings, improve device security and power supply be reliable Property.
Specific embodiment described herein is only to the spiritual explanation for example of the present invention.Technology neck belonging to of the invention The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode Generation, but without departing from spirit of the invention or surmount scope defined in appended claims.

Claims (7)

1. it is a kind of reduce via net loss three-phase imbalance adjusting method, it is characterised in that：Consider three-phase imbalance to network loss Influence, influence of influence and line loss of the single-phase load to network loss to degree of unbalancedness, propose comprehensive minimal losses and optimal change Mutually operation carries out three-phase imbalance regulation, and implementation is as follows,
When load is accessed using three-phase, carry out commutation model respective objects function when three-phase imbalance is adjusted and set up as follows,
It is provided with NtBar load branch circuit, genetic matrix is a switch phase sequence state matrix K, is expressed as follows,
K = b 1 ... b i ... b N t
Wherein, biRepresent i-th load branch circuit and access situation, switch on-off to A phases is [1 0 0]T, switching to B phases is [0 1 0]T, switching to C phases is [0 0 1]T；
(1) set before switch phase sequence do not change, flow through each phase current sum of all load branch circuit A, B, C three-phases for IOA、IOB、 IOC, average current Iave=(IOA+IOB+IOC) ÷ 3,
Current imbalance value after then adjusting is ((IA—Iave)、(IB—Iave)、(IC—Iave))
The object function for making three-phase current unbalance degree minimum is expressed as,
E1=Min { max [(IA—Iave)、(IB—Iave)、(IC—Iave)]}
(2) set switch phase sequence do not change before, initial switch phase sequence state matrix is designated as K0,
K 0 = b 0 1 ... b 0 i ... b 0 N t
Wherein, b0iRepresent i-th initial access situation of load branch circuit；
Define miIt is i-th switch change factor of load branch circuit, if b0iEqual to bi, then mi=0；b0iIt is not equal to bi, then mi=1；
The object function for making commutation process switch adjustment least number of times is expressed as,
e 2 = M i n { Σ i = 1 i = N t m i }
(3) object function for making three-phase load quantity equal is expressed as,
E3=Min { max (amountA, amountB, amountC) }
Wherein, amountA be K matrix in the first row all elements plus and, amountB be K matrix in the second row all elements Plus and, amountC be K matrix in the third line all elements plus and；
When load uses single-phase access, carry out commutation model respective objects function when three-phase imbalance is adjusted and be included in satisfaction Cause that three-phase line total losses are minimum, try to achieve I on the premise of tri-phase unbalance factor is of substantially equalA:IB:IC, proportionally relation enter The regulation of row phase-change switch,
Wherein, IA、IB、ICTotal current respectively in the total current in A phases, the total current in B phases, C phases.
2. the three-phase imbalance adjusting method of via net loss is reduced according to claim 1, it is characterised in that：Commutation is set to open Module and central control zone module are closed, phase-change switch module, all commutations are respectively provided with each bar load branch in power distribution network Switch module is concentrated and is connected to central control zone module；The three-phase current input of phase-change switch module is connected with three-phase line Connect, the three-phase current output end of phase-change switch module is connected with user；
The central control zone module includes control module and carrier module, and control module and carrier module are connected；The commutation Switch module includes electronic power switch unit and phase selection on-off controller unit, electronic power switch unit connection phase-selecting switch Controller unit；
The electronic power switch unit includes the phase-change switch of the phase-change switch, the phase-change switch of B phases and C phases of A phases, each phase Phase-change switch is realized using silicon controlled rectifier (SCR) and diode.
3. the three-phase imbalance adjusting method of via net loss is reduced according to claim 2, it is characterised in that：Three-phase load is not It is as follows that balance automatically adjusts implementation process,
Step one, setting three-phase current unbalance degree index, monitoring time interval T, three-phase current unbalance transfinite index and Three-phase current unbalance degree unit timing statisticses t0；
Step 2, sets three-phase current unbalance degree monitoring timer t1It is 0, setting tri-phase unbalance factor transfinites number of times t2It is 0； Start three-phase current unbalance degree monitoring timer t1；
Step 3, collection three-phase current data calculate degree of unbalancedness to central control zone module；
Whether step 4, judge the degree of unbalancedness of three-phase current transfinites index more than three-phase current unbalance；If being not above, turn To step 5；If exceeding, t is made2=t2+ 1 and turn to step 6；
Step 5, judges three-phase current unbalance degree detection counter t1Value whether be more than t0If being more than, step 2 is turned to, if It is less than or equal to, turns to step 3；
Step 6, judging the degree of unbalancedness of three-phase current transfinites number of times t2Whether transfinited index more than three-phase current unbalance；If not yet Have more than, turn to step 5；If exceeding, step 7 is performed；
Step 7, gathers the electric current and phase sequence data of each load branch circuit to central control zone module, and setting iterations variables A is 0；
Step 8, starts genetic algorithm, and the dependence mutual exclusion for being first depending on every load branch circuit correspondence threephase switch switching state is closed System, is encoded with vectorial genomical way, and switch on-off to A phases is [1 0 0]T, switching to B phases is [0 1 0]T, switching to C It is mutually [0 0 1]T, randomly generate initial population, including multiple genetic matrixes；Genetic matrix is each to be classified as load branch circuit Switch on-off situation；Corresponding variation rate is set；
Step 9, computing and judgement are carried out according to commutation model respective objects function pair genetic matrix, and selection meets the base of condition Because of matrix, current genetic matrix is intersected, is replicated and mutation operator, formed population of new generation；Carry out judging to change again Whether generation number reaches the iterations of setting, if so, obtaining optimal commutation control instruction, then carries out step 10；If it is not, then making Iterations variables A=A+1, and iteration performs step 9 again；
Step 10, optimal commutation order is transferred to the phase-selecting switch of phase-change switch module on each bar load branch through carrier module Controller unit, control electronic power switch unit completes commutation operation；
After central control zone module receives the completion information of phase selection on-off controller unit return, stand-by period T returns again to step Rapid two, proceed uneven monitoring adjustment next time.
4. the three-phase imbalance adjusting method of via net loss is reduced according to claim 2, it is characterised in that：Central control zone Remotely located, carrier module is arranged near load end the control module of module, the phase-selecting switch in each phase-change switch module Controller is connected respectively to carrier module；The phase selection on-off controller is connected with carrier module by RS485 or radio frequency, is carried Ripple module sets up communication connection by carrier communication with control module.
5. the three-phase imbalance adjusting method of via net loss is reduced according to claim 1 or 2 or 3 or 4, it is characterised in that： When load uses single-phase access, there is N number of load in establishing power network, three-phase line conductor length resistance is R, it is assumed that A, B, C three-phase load numbers are respectively l, and m, n are individual, and meet N=l+m+n,
For A phases, the load current respectively I on each branch road is takenA1, IA2...IAl, then the total current in A phasesIt is false If each branch road is respectively r to the distance of power distribution network power end1,r2...rl, the square value of the electric current on A phases, obtain an electric current put down Square matrixDistance on each branch road of A phases to power distribution network power end, obtains a distance matrix r=[r1, r2,...,rl]T；
The square value of the electric current on B phases, obtains a current squaring matrixTotal current in B phasesDistance on each branch road of B phases to power distribution network power end, obtains a distance matrix s=[s1,s2..., sm]T；
The square value of the electric current on C phases, obtains a current squaring matrixTotal current in C phasesDistance on each branch road of C phases to power distribution network power end, obtains a distance matrix t=[t1,t2,...,tn]T；
In this case, A phases line lossB phase line lossesC phase line lossesThree-phase line Total losses
Electric current on center line
I N = I A + I B ( - 1 2 + j 3 2 ) + I C ( - 1 2 - j 3 2 ) = ( I A - 1 2 I B - 1 2 I C ) + j 3 2 ( I B - I C )
Take parameter x=max { r1,r2,...rl,s1,s2,...sm,t1,t2,...tn, then the line loss on center line
Now total losses Δ P=Δs Pφ+ΔPN。
6. the three-phase imbalance adjusting method of via net loss is reduced according to claim 1 or 2 or 3 or 4, it is characterised in that： In view of access point after improvement apart from transformer farther out when be lost it is larger, access point away from transformer it is nearer when be lost it is small, in distance The different load of payload is accessed at different access points, loss is reduced.
7. the three-phase imbalance adjusting method of via net loss is reduced according to claim 5, it is characterised in that：In view of improvement Afterwards access point apart from transformer farther out when be lost it is larger, access point away from transformer it is nearer when be lost it is small, apart from different accesses The different load of payload is accessed at point, loss is reduced.
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CN108347061A (en) * 2018-04-28 2018-07-31 淄博康润电气有限公司 Intelligent positioning commutation point device and method in three-phase imbalance improvement
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CN109768558A (en) * 2018-12-19 2019-05-17 国网北京市电力公司 The three-phase load adjusting method and device of charging pile
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CN110112733A (en) * 2019-05-21 2019-08-09 华北水利水电大学 A kind of low-voltage distribution system introduces the line loss calculation model of degree of unbalancedness
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CN110112733B (en) * 2019-05-21 2023-03-14 华北水利水电大学 Line loss calculation method for introducing unbalance degree into low-voltage distribution system
CN110556845A (en) * 2019-09-25 2019-12-10 许继集团有限公司 Control terminal, and three-phase imbalance regulation and control method and system
CN110556845B (en) * 2019-09-25 2021-02-19 许继集团有限公司 Control terminal, and three-phase imbalance regulation and control method and system
CN110942173A (en) * 2019-10-15 2020-03-31 合肥工业大学 Power distribution station energy-saving loss-reducing method based on load prediction and phase sequence optimization
CN110942173B (en) * 2019-10-15 2022-04-19 合肥工业大学 Power distribution station energy-saving loss-reducing method based on load prediction and phase sequence optimization
CN110967564B (en) * 2019-10-28 2022-04-01 许昌开普检测研究院股份有限公司 Automatic testing system of commutation switch type three-phase load unbalance automatic adjusting device
CN110967564A (en) * 2019-10-28 2020-04-07 许昌开普检测研究院股份有限公司 Automatic test system for phase change switch type three-phase unbalanced load automatic regulating device
CN111600319B (en) * 2020-03-05 2023-04-18 青岛鼎信通讯股份有限公司 Power electronic type distributed three-phase imbalance treatment method
CN111600319A (en) * 2020-03-05 2020-08-28 青岛鼎信通讯股份有限公司 Power electronic type distributed three-phase imbalance treatment method
CN113937821A (en) * 2021-09-17 2022-01-14 贵州电网有限责任公司 Self-adaptive energy-saving control method for unbalanced transformer area of rural power grid
CN115102195A (en) * 2022-07-18 2022-09-23 山东农业工程学院 Three-phase load unbalance treatment method and device based on rural power grid
CN115622090A (en) * 2022-10-27 2023-01-17 伊犁职业技术学院 Three-phase load unbalance degree treatment method and device and transformer

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Application publication date: 20170613