CN105870945B - A kind of three-phase current unbalance for low-voltage network automatically adjusts algorithm - Google Patents
A kind of three-phase current unbalance for low-voltage network automatically adjusts algorithm Download PDFInfo
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Abstract
A kind of three-phase current unbalance for low-voltage network automatically adjusts algorithm, includes the following steps：(1) to phase changer setting data window (2) according to whether reaching 24 hours delay times to determine whether extraction phase changer data, call balanced algorithm；(3) after calling balanced algorithm, judge whether to need commutation according to whether the effect after presetting is better than setting value；The present invention solves the problems, such as that power distribution network low-pressure side current three-phase is unbalanced, it is proposed one kind using branch as controlled plant, using day as regulating cycle, using taiwan area balance as the balance scheme of target, to reach taiwan area three-phase equilibrium, distribution transforming power supply capacity is effectively promoted, low-voltage circuit loss is reduced, improves customer power supply quality of voltage.
Description
Technical field
The present invention relates to field of power more particularly to a kind of three-phase current unbalance for low-voltage network are automatic
Adjust algorithm.
Background technology
Three-phase imbalance：Refer to that three-phase current (or voltage) amplitude is inconsistent in the power system, and difference in magnitude is more than rule
Determine range.
Harm caused by three-phase imbalance is as follows：
1. increasing the electric energy loss of circuit.In three-phase four-wire power supply network, when electric current passes through line conductor, because existing
Impedance will produce electricl energy loss, be lost to by the square directly proportional of electric current.When low voltage electric network is with three-phase four-wire power supply
When, due to the presence of single-phase load, causing threephase load imbalance unavoidable.It is neutral when threephase load off-center operation
Line has electric current to pass through.Not only phase line is lossy in this way, and the neutral conductor also generates loss, to increase the damage of power network line
Consumption.
2. increasing the electric energy loss of distribution transformer.Distribution transformer is the power supply main equipment of low voltage electric network, when it is three
When being run under phase load imbalance operating mode, it will cause the increase of distribution loss.Because the power attenuation of distribution transforming is with load
Degree of unbalancedness and change.
It is reduced 3. distribution transforming is contributed.When distribution transforming designs, winding construction is designed by load balance operating condition, winding
Performance is almost the same, and each phase rated capacity is equal.The maximum allowable output of distribution transforming will be limited by every phase rated capacity.If
It is run when distribution transforming is under threephase load imbalance operating mode, loading a light phase just has spare capacity, to make the output of distribution transforming
It reduces.Its output reduction degree is related with the degree of unbalancedness of threephase load.Threephase load imbalance is bigger, and distribution transforming is contributed to reduce and be got over
It is more.For this purpose, distribution transforming is run in threephase load imbalance, the capacity of output is just unable to reach rated value, and spare capacity is also
Corresponding to reduce, overload capacity also reduces.If distribution transforming is run under overload conditions, i.e., easily cause distribution transforming fever, when serious very
Distribution transforming scaling loss can extremely be caused.
4. distribution transforming generates zero-sequence current.Distribution transforming is run under threephase load imbalance operating mode, will generate zero-sequence current, the electricity
Stream will change with the unbalanced degree of threephase load, and degree of unbalancedness is bigger, then zero-sequence current is also bigger.If running distribution transforming
There are zero-sequence currents, then will generate zero sequence fluxes in its iron core.(high-pressure side does not have zero-sequence current) this force zero sequence fluxes can only
Passed through using oil tank wall and steel member as channel, and the magnetic permeability of steel member is relatively low, when zero-sequence current passes through steel member, i.e., to produce
Magnetisation is stagnant and eddy-current loss, even generates heat to make the steel member local temperature of distribution transforming increase.The winding insulation of distribution transforming may also
Accelerate aging because of overheat, equipment life is caused to reduce.Meanwhile the presence of zero-sequence current can also increase the loss of distribution transforming.
5. influencing the safe operation of electrical equipment.Distribution transforming is according to threephase load balance movement operating condition design, per phase
The resistance of winding, leakage reactance and exciting impedance are almost the same.When distribution transforming is run when threephase load balances, the basic phase of three-phase current
Deng inside, distribution transforming it is also essentially identical per phase pressure drop, then the three-phase voltage of distribution transforming output is also balance.
If distribution transforming is run in threephase load imbalance, each phase output current is with regard to unequal, three-phase inside distribution transforming
With regard to unequal, this will lead to distribution transforming output voltage three-phase imbalance for pressure drop.Meanwhile distribution transforming is in threephase load imbalance luck
Row, three-phase output current is different, and the neutral conductor just has electric current and passes through.The neutral conductor is thus set to generate impedance voltage drop, to lead
Neutral point drifting is caused, each phase phase voltage is caused to change.Loading a phase voltage of weight reduces, and loads a light phase voltage liter
It is high.It powers under Voltage unbalance situation, that is, the user power utilization equipment for be easy to causeing the high phase tape splicing of voltage is burnt out, and voltage
The user power utilization equipment of a low phase tape splicing possibly can not then use.So when threephase load off-center operation, will seriously jeopardize
The safe operation of electrical equipment.
6. motor efficiency reduces.Distribution transforming is run under threephase load imbalance operating mode, will cause output voltage three-phase not
Balance.Since there is three positive sequence, negative phase-sequence, zero sequence component of voltage for unbalance voltage, when this unbalanced control source electricity
After motivation, negative sequence voltage generates rotating excitation field with the rotating excitation field of positive sequence voltage generation on the contrary, playing braking action.But due to just
Sequence magnetic field is more much better than than negative sequence field, and motor is still pressed positive sequence magnetic direction and rotated.And due to the braking action of negative sequence field,
Output power of motor will be caused to reduce, be reduced so as to cause motor efficiency.Meanwhile the Wen Sheng of motor and idle damage
Consumption, will also increase with the degree of unbalancedness of three-phase voltage.So motor is run under imbalance of three-phase voltage situation, it is very
It is uneconomical and unsafe.
Invention content
To solve the problems, such as that power distribution network low-pressure side current three-phase is unbalanced, one kind is proposed using branch as controlled plant, with 24
Hour is regulating cycle, using taiwan area balance as the balance scheme of target, to reach taiwan area three-phase equilibrium.Present invention aims at
A kind of three-phase current unbalance automatic adjustment algorithm for low-voltage network is provided.
The present invention provides the following technical solutions：
A kind of three-phase current unbalance for low-voltage network automatically adjusts algorithm, includes the following steps：
(1) data window is set to phase changer, the every 1 minute average current calculated in this 1 minute primary is then filled with number
According to window；(2) cumulative average current per minute is begun to after central controller power-up initializing, after reaching first and a half hours
Just calculate the average current and record of this half an hour, the next Record Comparison per half an hour and upper one and a half hours,
If one and a half hours average current is small in the average current ratio of current half an hour, records this current moment and obtain commutation
Device current time half an hour data and stores forward, if phase changer is having the data sent not successfully all at this moment one before
With being sent to central controller, if one and a half hours average current is big in the average current ratio of current half an hour, judge whether to
Up to 24 hours delay times, if do not reached, central controller continued cumulative current data per minute, if reaching 24 small time delays
When the time, then extract phase changer data, calculate 24 hourly average electric currents, call balanced algorithm；
(3) after calling balanced algorithm, judge whether to need commutation according to whether the effect after presetting is better than setting value, if
It is no better than setting value not needing commutation then and restart delay in 24 hours, commutation is needed if being better than setting value, according to half
Hour data calculates the minimum current moment, calculates the phase changer commutation time, sends phase changer actuation time and action phase, judges
The commutation time for whether reaching phase changer, when delay waits for the commutation for judging whether to reach phase changer always if not reaching
Between, it restarts 24 hours and is delayed if reaching.
It further illustrates, a kind of three-phase current unbalance for low-voltage network automatically adjusts algorithm, described
Balanced algorithm it is as follows：
Unadjustable electric current Mx indicates as follows：
Mx=Ix- ∑s WIx；
Wherein, x A, B, C；
∑WIx：All phase changer total currents hung in certain phase；
Ix：Each phase total current of certain branch central controller acquisition；
Ip：Three-phase average current Ip=(Ia+Ib+Ic)/3
Each electric current Δ Ix that need to mutually compensate indicates as follows：
Δ Ix=Ix-Ip；
Interpretation of result according to Mx and Ip than size：
Work as Mx>Ip：The unadjustable electric current cut off after this mutually all phase changer is also bigger than average current, illustrates even if cutting
This mutually all phase changer, this can not mutually reach balance, you can not extrapolate this branch phase changer selected element not pair or commutation
Device is very little, this should mutually cut off all phase changers and compensate other phases from algorithm；
Work as Mx<Ip：The unadjustable electric current cut off after this mutually all phase changer is smaller than average current, illustrates that this can mutually lead to
Cross the optimum balance that adjustment phase changer reaches this phase；
As the Mx for having two-phase in three-phase>Ip then uses adjustment algorithm 1, as an only phase Mx>Ip then uses adjustment algorithm 2,
When three-phase is all that Mx ＜ Ip then use adjustment algorithm 3；
Degree of unbalancedness=(maximum current-minimum current)/maximum current X100%；
The degree of unbalancedness and the adjustment algorithm 1,2,3 it is calculated it is presetting after degree of unbalancedness compared.
It further illustrates, a kind of three-phase current unbalance for low-voltage network automatically adjusts algorithm, described
Adjustment algorithm 1 it is as follows：
There is two-phase to meet Mx>Ip, this two-phase are A phases and B phases, and an only phase meets Mx<Ip, this is mutually C phases,
(1) A phases and B phases phase changer are all changed to that phase of C, at this time A and B phase currents are all unadjustable electric current Ma
And Mb；
(2) C phases be all phase changer electric currents add the unadjustable electric current Mc of oneself, then carry out it is presetting after imbalance
Degree calculate, return this value for algorithm flow calculate it is presetting after degree of unbalancedness.
It further illustrates, a kind of three-phase current unbalance for low-voltage network automatically adjusts algorithm, described
Adjustment algorithm 2 it is as follows：
Only a phase meets Mx>Ip, this is mutually A phases, other two-phases meet Mx<Ip, this two-phase are B phases and C phases；
(1) the total current ∑ WIA for calculating the phase changer of A phases, needs the phase changer A phases to change, gives over to spare；
(2) average current of B phases and C phases is found out, phase changer total current, that is, Ip2=(Ib+Ic+ ∑s of A phases need to be added
WIA)/2；
(3) Δ Ix, Δ Ix=Ip2-Ix are found out, obtains every phase electric current to be compensated, then is calculated with recursive algorithm closest
The phase changer of the electric current Ibmin of △ Ib combines, and is combined with the phase changer that recursive algorithm is calculated closest to the electric current Icmin of △ Ic；
(4) work as Icmin<C phases are first compensated when Ibmin, otherwise first compensate B phases, the phase changer group of satisfaction when first compensating C phases
C phases are changed in conjunction, remaining phase changer changes to B phases；
(5) degree of unbalancedness after calculating is presetting.
It further illustrates, a kind of three-phase current unbalance for low-voltage network automatically adjusts algorithm, described
Adjustment algorithm 3 it is as follows：
Three-phase all meets Mx<Ip；Assuming that the value of ∑ WIx- (Ip-Mx) is A>B>C；
(1) find out each phase needs the electric current of compensation, electric current=Ip-Mx of compensation on the basis of non-adjustable electric current；
(2) the electric current Iamin that the phase changer combination of A phases is calculated with recursive algorithm, the phase changer of B phases is calculated with recursive algorithm
The electric current Ibmin of combination calculates the electric current Icmin of the phase changer combination of C phases with recursive algorithm；
(3) compare Iamin, Ibmin and Icmin that phase current and which phase then preferentially compensated closer to target current, than
If Iamin is closer to compensation electric current, then first corresponding phase changer is combined and give A phases, Ibmin is second close, then correspondence
Phase changer combine and give B phases, remaining phase changer, which combines, gives C phases；
(4) calculate it is presetting after degree of unbalancedness.
It further illustrates, a kind of three-phase current unbalance for low-voltage network automatically adjusts algorithm, described
Phase changer data window be i, 24≤i≤30.
It further illustrates, a kind of three-phase current unbalance for low-voltage network automatically adjusts algorithm, described
Central controller be provided with central controller data storage area and phase changer data storage area.
It further illustrates, a kind of three-phase current unbalance for low-voltage network automatically adjusts algorithm, described
Central controller at least once communicated per half an hour, obtain the data of phase changer.
It further illustrates, a kind of three-phase current unbalance for low-voltage network automatically adjusts algorithm, described
Setting value be 2%.
In conclusion beneficial effects of the present invention are as follows：
The present invention solves the problems, such as that power distribution network low-pressure side current three-phase is unbalanced, and proposition is a kind of using branch as controlled plant,
Using day as regulating cycle, using taiwan area balance as the balance scheme of target, to reach taiwan area three-phase equilibrium, effectively promotes distribution transforming and supply
Electric energy power reduces low-voltage circuit loss, improves customer power supply quality of voltage.
Description of the drawings
Fig. 1 is the work flow diagram of central controller；
Fig. 2 is the flow chart of uneven strategy；
Fig. 3 is the flow chart of adjustment algorithm 1；
Fig. 4 is the flow chart of adjustment algorithm 2；
Fig. 5 is the flow chart of adjustment algorithm 3；
Specific implementation mode
Below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described,
Obviously, described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the reality in the present invention
Example is applied, the every other embodiment that field those of ordinary skill is obtained without making creative work belongs to
The scope of protection of the invention.
Embodiment 1
A kind of three-phase current unbalance for low-voltage network automatically adjusts algorithm, includes the following steps：
(1) data window is set to phase changer, data window size is 24 hours, is calculated in this 1 minute primary within every 1 minute
Average current, be then filled with data window.
(2) cumulative average current per minute is begun to after central controller power-up initializing, when arrival first and a half hours
The average current and record of this half an hour, the next record pair per half an hour and upper one and a half hours are just calculated afterwards
Than if one and a half hours average current is small in the average current ratio of current half an hour, recording this current moment and obtaining
Phase changer current time half an hour data and stores forward, if phase changer is having the data sent not successfully all at this moment before
Quarter is sent to central controller together, if one and a half hours average current is big in the average current ratio of current half an hour, judgement is
24 hours delay times of no arrival, if do not reached, central controller continues cumulative current data per minute, if it is small to reach 24
When delay time, then extract phase changer data, calculate 24 hourly average electric currents.
(3) degree of unbalancedness=(maximum current-minimum current)/maximum current X100%.
(4) total current the ∑ WIA, Ia for calculating all phase changers in A phases are A phase average electric currents, calculate all commutations in B phases
Total current the ∑ WIB, Ib of device are B phase average electric currents, and total current the ∑ WIC, Ic for calculating all phase changers in C phases are C phase averages
Electric current.
(5) IA is the A phase total currents of A branch central controllers acquisition, and IB is the B phase total currents of B branch central controllers acquisition, and IC is
The C phase total currents of C branch central controllers acquisition, MA：A branch total currents subtract the non-adjustable economize on electricity after the phase changer total current of A phases
Stream, MB：B branch total currents subtract the unadjustable electric current after the phase changer total current of B phases, MC：C branch total currents subtract C phases
Phase changer total current after unadjustable electric current, MA=IA- ∑s WIA, MB=IB- ∑ WIB, MC=IC- ∑ WIC.
(6)Ip：Three-phase average current Ip=(Ia+Ib+Ic)/3, Δ IA, which are A phases, needs compensation electric current, wherein Δ IA=IA-
Ip, Δ IB, which are B phases, needs compensation electric current, and wherein Δ IB=IB-Ip, Δ IC, which are C phases, needs compensation electric current, wherein Δ IC=IC-Ip.
(7) MA at this time>Ip, MB>Ip, MC<Ip.A phases and B phases phase changer are all changed to that phase of C, at this time A and B phases
Electric current all be unadjustable electric current Ma and Mb, C phases be all phase changer electric currents add the unadjustable electric current Mc of oneself, then into
Row it is presetting after degree of unbalancedness calculate, return this value for algorithm flow calculate it is presetting after degree of unbalancedness.
(8) according to step (7) calculate it is presetting after the uneven point degree of degree of unbalancedness and step (3) compared, effect
Fruit is better than 2% judgement, calculates the minimum current moment according to half an hour data, calculates the phase changer commutation time, it is dynamic to send phase changer
Make time and action phase, reach the commutation time of phase changer at this time, restarts 24 hours and be delayed.
Embodiment 2
A kind of three-phase current unbalance for low-voltage network automatically adjusts algorithm, includes the following steps：
(1) data window is set to phase changer, data window size is 30 hours, is calculated in this 1 minute primary within every 1 minute
Average current, be then filled with data window.
(2) cumulative average current per minute is begun to after central controller power-up initializing, when arrival first and a half hours
The average current and record of this half an hour, the next record pair per half an hour and upper one and a half hours are just calculated afterwards
Than if one and a half hours average current is small in the average current ratio of current half an hour, recording this current moment and obtaining
Phase changer current time half an hour data and stores forward, if phase changer is having the data sent not successfully all at this moment before
Quarter is sent to central controller together, if one and a half hours average current is big in the average current ratio of current half an hour, judgement is
24 hours delay times of no arrival, if do not reached, central controller continues cumulative current data per minute, if it is small to reach 24
When delay time, then extract phase changer data, calculate 24 hourly average electric currents.
(3) degree of unbalancedness=(maximum current-minimum current)/maximum current X100%.
(4) total current the ∑ WIA, Ia for calculating all phase changers in A phases are A phase average electric currents, calculate all commutations in B phases
Total current the ∑ WIB, Ib of device are B phase average electric currents, and total current the ∑ WIC, Ic for calculating all phase changers in C phases are C phase averages
Electric current.
(5) IA is the A phase total currents of A branch central controllers acquisition, and IB is the B phase total currents of B branch central controllers acquisition, and IC is
The C phase total currents of C branch central controllers acquisition, MA：A branch total currents subtract the non-adjustable economize on electricity after the phase changer total current of A phases
Stream, MB：B branch total currents subtract the unadjustable electric current after the phase changer total current of B phases, MC：C branch total currents subtract C phases
Phase changer total current after unadjustable electric current, MA=IA- ∑s WIA, MB=IB- ∑ WIB, MC=IC- ∑ WIC.
(6)Ip：Three-phase average current Ip=(Ia+Ib+Ic)/3, Δ IA, which are A phases, needs compensation electric current, wherein Δ IA=IA-
Ip, Δ IB, which are B phases, needs compensation electric current, and wherein Δ IB=IB-Ip, Δ IC, which are C phases, needs compensation electric current, wherein Δ IC=IC-Ip.
(7) MA at this time>Ip, MB ＜ Ip, MC<Ip.The total current ∑ WIA for calculating the phase changer of A phases, needs changing A phases
Phase device is changed, and gives over to spare, finds out the average current of B phases and C phases, need to add phase changer total current, that is, Ip2=(Ib+Ic of A phases
+ ∑ WIA)/2, Δ Ix, Δ Ix=Ip2-Ix are found out, this is known that every phase electric current to be compensated, and is calculated with recursive algorithm closest
The phase changer of the electric current Ibmin of △ Ib combines, and is combined with the phase changer that recursive algorithm is calculated closest to the electric current Icmin of △ Ic,
Work as Icmin<C phases are first compensated when Ibmin, otherwise first compensate B phases, and C phases are changed in the phase changer combination of satisfaction when first compensating C phases,
Remaining phase changer changes to B phases, the degree of unbalancedness after calculating is presetting.
(8) according to step (7) calculate it is presetting after the uneven point degree of degree of unbalancedness and step (3) compared, effect
Fruit, which is not better than, is better than 5%, does not need commutation and restarts delay in 24 hours.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from the spirit and principles of the present invention made by changes, modifications, substitutions, combinations, simplifications,
Equivalent substitute mode is should be, is included within the scope of the present invention.
Claims (9)
1. a kind of three-phase current unbalance for low-voltage network automatically adjusts algorithm, which is characterized in that include the following steps：
(1) data window is set to phase changer, the every 1 minute average current calculated in this 1 minute primary is then filled with data window
Mouthful；
(2) cumulative average current per minute is begun to after central controller power-up initializing, after reaching first and a half hours just
Calculate the average current and record of this half an hour, the next Record Comparison per half an hour and upper one and a half hours, if
One and a half hours average current is small in the average current ratio of current half an hour, then records this current moment and obtain phase changer
Current time half an hour data and stores forward, if phase changer have before the data that send not successfully all this moment together
It is sent to central controller, if one and a half hours average current is big in the average current ratio of current half an hour, judges whether to reach
24 hours delay times, if do not reached, central controller continues cumulative current data per minute, is delayed if reached 24 hours
Time then extracts phase changer data, calculates 24 hourly average electric currents, calls balanced algorithm；
(3) after calling balanced algorithm, judge whether to need commutation according to whether the effect after presetting is better than setting value, if bad
Commutation is not needed then and is restarted 24 hours in setting value and is delayed, and commutation is needed if being better than setting value, according to half an hour
Data calculate the minimum current moment, calculate the phase changer commutation time, send phase changer actuation time and action phase, judge whether
The commutation time for reaching phase changer, delay waits for the commutation time for judging whether to reach phase changer always if not reaching,
It restarts 24 hours and is delayed if reaching.
2. a kind of three-phase current unbalance for low-voltage network according to claim 1 automatically adjusts algorithm, special
Sign is that the balanced algorithm is as follows：
Unadjustable electric current Mx indicates as follows：
Mx=Ix- ∑s WIx；
Wherein, x A, B, C；
∑WIx：All phase changer total currents hung in certain phase；
Ix：Each phase total current of certain branch central controller acquisition；
Ip：Three-phase average current Ip=(Ia+Ib+Ic)/3
Each electric current Δ Ix that need to mutually compensate indicates as follows：
Δ Ix=Ix-Ip；
Interpretation of result according to Mx and Ip than size：
Work as Mx>Ip：The unadjustable electric current cut off after this mutually all phase changer is also bigger than average current, this should mutually cut off all
Phase changer compensates other phases；
Work as Mx<Ip：The unadjustable electric current cut off after this mutually all phase changer is smaller than average current, reaches by adjusting phase changer
The optimum balance of this phase；
As the Mx for having two-phase in three-phase>Ip then uses adjustment algorithm 1, as an only phase Mx>Ip then uses adjustment algorithm 2, when three
All it is mutually Mx<Ip then uses adjustment algorithm 3；
Degree of unbalancedness=(maximum current-minimum current)/maximum current × 100%；
The degree of unbalancedness and the adjustment algorithm 1,2,3 it is calculated it is presetting after degree of unbalancedness compared.
3. a kind of three-phase current unbalance for low-voltage network according to claim 2 automatically adjusts algorithm, special
Sign is that the adjustment algorithm 1 is as follows：
There is two-phase to meet Mx>Ip, this two-phase are A phases and B phases, and an only phase meets Mx<Ip, this is mutually C phases,
(1) A phases and B phases phase changer are all changed to that phase of C, at this time A and B phase currents all be unadjustable electric current Ma and
Mb；
(2) C phases be all phase changer electric currents add the unadjustable electric current Mc of oneself, then carry out it is presetting after degree of unbalancedness meter
Calculate, return this value for algorithm flow calculate it is presetting after degree of unbalancedness.
4. a kind of three-phase current unbalance for low-voltage network according to claim 2 automatically adjusts algorithm, special
Sign is that the adjustment algorithm 2 is as follows：
Only a phase meets Mx>Ip, this is mutually A phases, other two-phases meet Mx<Ip, this two-phase are B phases and C phases；
(1) the total current ∑ WIA for calculating the phase changer of A phases, needs the phase changer A phases to change, gives over to spare；
(2) average current of B phases and C phases is found out, phase changer total current, that is, Ip2=(Ib+Ic+ ∑ WIA)/2 of A phases need to be added；
(3) Δ Ix, Δ Ix=Ip2-Ix are found out, obtains every phase electric current to be compensated, then is calculated closest to △ Ib with recursive algorithm
Electric current Ibmin phase changer combination, with recursive algorithm calculate closest to △ Ic electric current Icmin phase changer combine；
(4) work as Icmin<C phases are first compensated when Ibmin, otherwise first compensate B phases, and the phase changer combination of satisfaction is changed when first compensating C phases
To C phases, remaining phase changer changes to B phases；
(5) degree of unbalancedness after calculating is presetting.
5. a kind of three-phase current unbalance for low-voltage network according to claim 2 automatically adjusts algorithm, special
Sign is that the adjustment algorithm 3 is as follows：
Three-phase all meets Mx<Ip；Assuming that the value of ∑ WIx- (Ip-Mx) is A>B>C；
(1) find out each phase needs the electric current of compensation, electric current=Ip-Mx of compensation on the basis of non-adjustable electric current；
(2) the electric current Iamin of the phase changer combination of A phases is calculated with recursive algorithm, the phase changer that B phases are calculated with recursive algorithm combines
Electric current Ibmin, with recursive algorithm calculate C phases phase changer combination electric current Icmin；
(3) compare Iamin, Ibmin and Icmin that phase current and which phase then preferentially compensated closer to target current；
(4) calculate it is presetting after degree of unbalancedness.
6. a kind of three-phase current unbalance for low-voltage network according to claim 1 or 2 automatically adjusts algorithm,
It is characterized in that：The data window of the phase changer is i, 24≤i≤30.
7. a kind of three-phase current unbalance for low-voltage network according to claim 1 or 2 automatically adjusts algorithm,
It is characterized in that：The central controller is provided with central controller data storage area and phase changer data storage area.
8. a kind of three-phase current unbalance for low-voltage network according to claim 1 or 2 automatically adjusts algorithm,
It is characterized in that：The central controller is at least once communicated per half an hour, obtains the data of phase changer.
9. a kind of three-phase current unbalance for low-voltage network according to claim 1 or 2 automatically adjusts algorithm,
It is characterized in that：The setting value is 2%.
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| CN108471128B (en) * | 2018-05-05 | 2021-04-23 | 石家庄科林电气股份有限公司 | Three-phase load unbalance automatic adjustment method realized by using balance optimization algorithm |
| CN109560559B (en) * | 2018-11-29 | 2022-03-18 | 广州百德自动化技术有限公司 | Three-phase current self-adaptive balancing method for low-voltage distribution network |
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| CN110429623B (en) * | 2019-08-30 | 2021-04-30 | 北京同时开关技术有限公司 | Voltage phase change method, phase change device, electronic device and readable storage medium |
| CN111509740A (en) * | 2020-03-11 | 2020-08-07 | 北京市腾河智慧能源科技有限公司 | Method and device for calculating mean value of intelligent pit filling |
| CN111478349B (en) * | 2020-04-16 | 2021-06-04 | 国网冀北电力有限公司电力科学研究院 | Power three-phase balance strategy method based on power utilization equipment intelligent network regulation and control Internet of things |
| CN112305361A (en) * | 2020-11-06 | 2021-02-02 | 江苏省电力试验研究院有限公司 | Temperature rise test three-phase unbalanced current compensation system and control method |
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