CN105870945A - Three-phase current imbalance automatic regulation algorithm for low-voltage power distribution network - Google Patents
Three-phase current imbalance automatic regulation algorithm for low-voltage power distribution network Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
A three-phase current imbalance automatic regulation algorithm for a low-voltage power distribution network includes the following steps that 1, a data window is set for a phase changer; 2, whether data of the phase changer is extracted or not is judged according to whether the delay time of 24 hours is reached or not, and a balance algorithm is called; 3, after the balance algorithm is called, whether phase changing is needed or not is judged according to whether a pre-regulation effect is better than that indicated by a set value or not. The three-phase current imbalance automatic regulation algorithm solves the problem of three-phase imbalance of the low-voltage side current of the power distribution network, and a balance scheme with a branch circuit as the regulation object, a day as the regulation cycle and transformer district balance as the target is proposed, so that three-phase balance of a transformer district is achieved, the power supply capacity of a distribution transformer is effectively improved, the loss of a low-voltage line is reduced, and the quality of supply voltage for users is improved.
Description
Technical field
The present invention relates to field of power, particularly relate to a kind of three-phase current unbalance for low-voltage network and be automatically adjusted
Algorithm.
Background technology
Three-phase imbalance: refer to that three-phase current (or voltage) amplitude is inconsistent in power system, and difference in magnitude exceedes regulation
Scope.
The harm that three-phase imbalance causes is as follows:
1. increase the electric energy loss of circuit.In three-phase four-wire power supply network, when electric current is by line conductor, will because there is impedance
Produce electric energy loss, its loss and square being directly proportional by electric current.When low voltage electric network is with three-phase four-wire power supply, owing to having
Single-phase load exists, and causes threephase load imbalance to can hardly be avoided.When threephase load off-center operation, the neutral conductor i.e. has electric current
Pass through.The most not only phase line is lossy, and the neutral conductor also produces loss, thus adds the loss of power network line.
2. increase the electric energy loss of distribution transformer.Distribution transformer is the power supply main equipment of low voltage electric network, when it is born at three-phase
When carrying operation under uneven operating mode, it will cause the increase of distribution loss.Because the power attenuation of distribution transforming is the imbalance with load
Spend and change.
3. distribution transforming is exerted oneself minimizing.During distribution transforming design, its winding construction is designed by load balance operating condition, its winding
Can be basically identical, each phase rated capacity is equal.Maximum allowable the exerting oneself of distribution transforming to be limited by every phase rated capacity.If working as
Distribution transforming is under threephase load imbalance operating mode operation, and loading a light phase just has spare capacity, so that the minimizing of exerting oneself of distribution transforming.
Its minimizing degree of exerting oneself is relevant with the degree of unbalancedness of threephase load.Threephase load imbalance is the biggest, distribution transforming exert oneself minimizing the most.For
This, distribution transforming runs when threephase load imbalance, and the capacity of its output is just unable to reach rated value, and its spare capacity subtracts the most accordingly
Few, overload capacity also reduces.If distribution transforming runs under overload conditions, the most easily cause distribution transforming heating, even can make time serious
Become distribution transforming scaling loss.
4. distribution transforming produces zero-sequence current.Distribution transforming runs under threephase load imbalance operating mode, will produce zero-sequence current, this electric current
To change with the unbalanced degree of threephase load, degree of unbalancedness is the biggest, then zero-sequence current is the biggest.If operating distribution transforming is deposited
At zero-sequence current, then its iron core will produce zero sequence fluxes.(high-pressure side does not has zero-sequence current) this force the zero sequence fluxes can only be with fuel tank
Wall and steel beam column pass through as passage, and the permeability of steel beam column is relatively low, when zero-sequence current is by steel beam column, and magnetic hysteresis to be produced
And eddy-current loss, even generate heat so that the steel beam column local temperature of distribution transforming raises.The winding insulation of distribution transforming be likely to because of overheated and
Accelerate aging, cause reduce equipment life.Meanwhile, the existence of zero-sequence current also can increase the loss of distribution transforming.
5. affect the safe operation of electrical equipment.Distribution transforming according to threephase load balance movement operating condition design, its every phase winding
Resistance, leakage reactance and exciting impedance basically identical.When distribution transforming runs when threephase load balances, and its three-phase current is of substantially equal,
The internal every phase pressure drop of distribution transforming is the most essentially identical, then the three-phase voltage of distribution transforming output is also balance.
If distribution transforming runs when threephase load imbalance, it is the most unequal that it exports electric current mutually, the internal three-phase pressure drop of its distribution transforming
The most unequal, this will cause distribution transforming output voltage three-phase imbalance.Meanwhile, distribution transforming runs when threephase load imbalance, and three
Output electric current is different mutually, and the neutral conductor just has electric current and passes through.Thus make the neutral conductor produce impedance voltage drop, thus cause neutrality
Point drift, causes each phase phase voltage to change.One phase voltage of load weight reduces, and loads a light phase voltage and raise.?
Under Voltage unbalance situation power, the user power utilization equipment i.e. easily causing the high phase tape splicing of voltage burns out, and voltage low one
The user power utilization equipment of phase tape splicing then possibly cannot use.So during threephase load off-center operation, will seriously jeopardize electrical equipment
Safe operation.
6. motor efficiency reduces.Distribution transforming runs under threephase load imbalance operating mode, will cause output voltage three-phase imbalance.
Owing to unbalance voltage also exists positive sequence, negative phase-sequence, three component of voltages of zero sequence, after this unbalanced voltage inputs motor,
It is contrary with the rotating excitation field that positive sequence voltage produces that negative sequence voltage produces rotating excitation field, plays braking action.But due to positive sequence magnetic field ratio
Negative sequence field is much better than, and motor is still rotated by positive sequence magnetic direction.And due to the braking action of negative sequence field, will cause
Output power of motor reduces, thus causes motor efficiency to reduce.Meanwhile, the temperature rise of motor and reactive loss, also will be with
The degree of unbalancedness of three-phase voltage and increase.So motor runs under imbalance of three-phase voltage situation, it is the most uneconomical and not
Safety.
Summary of the invention
For solving the power distribution network unbalanced problem of low-pressure side current three-phase, propose a kind of with branch road as controlled plant, little with 24
Time be regulating cycle, with the platform district balance balance scheme as target, thus reach the three-phase equilibrium of platform district.Present invention aim at carrying
It is automatically adjusted algorithm for a kind of three-phase current unbalance for low-voltage network.
The present invention provides following technical scheme:
A kind of three-phase current unbalance for low-voltage network is automatically adjusted algorithm, comprises the steps:
(1) data window is set to phase changer, within every 1 minute, calculates once this 1 minute interior average current, be then filled with data window；
(2) when beginning to cumulative average current per minute after central controller power-up initializing, after arriving first and a half hours, this is just calculated
The average current of half an hour record, ensuing per half an hour and the Record Comparison of upper one and a half hours, if when first half is little
Time average current less than the average current of upper one and a half hours, then record this moment current to obtain phase changer current time past
Front half hour data also stores, if phase changer is to have the data of unsuccessful transmission the most at this moment to carve before sent along to central controller,
If current halfhour average current is bigger than the average current of upper one and a half hours, then judge whether to arrive 24 hours delay times,
If do not arrived, then central controller continues cumulative current data per minute, if arriving 24 hours delay times, then extracts commutation
Device data, calculate 24 hourly average electric currents, call balanced algorithm；
(3), after calling balanced algorithm, whether being better than setting value according to the effect after presetting and judge whether to need commutation, setting if be no better than
Definite value then need not commutation and restarts time delay in 24 hours, if being better than setting value, needs commutation, calculates according to data half an hour
Go out the minimum current moment, calculate the phase changer commutation time, send phase changer actuation time and action phase place, it may be judged whether arrive and change
The commutation time of phase device, without reaching, time delay always waits the commutation time judging whether to arrive phase changer, if arrived
Then restart time delay in 24 hours.
Further illustrating, described a kind of three-phase current unbalance for low-voltage network is automatically adjusted algorithm, and described is flat
Account method as follows:
Unadjustable electric current Mx is expressed as follows:
Mx=Ix-∑ WIx；
Wherein, x is A, B, C；
∑ WIx: all phase changer total currents hung in certain phase；
Each phase total current that Ix: certain branch road central controller gathers；
Ip: three-phase average current Ip=(Ia+Ib+Ic)/3
Need to compensate electric current Δ Ix mutually to be expressed as follows:
Δ Ix=Ix-Ip；
According to Mx and Ip than the interpretation of result of size:
As Mx > Ip: excise the unadjustable electric current after all phase changers of this phase also big than average current, even if illustrating that cutting this phase owns
Phase changer, this phase can not reach balance, can extrapolate this branch road phase changer selected element not to or phase changer very little, from
On algorithm, this phase should be excised all phase changers and be compensated other phases；
As Mx < Ip: excise the unadjustable current ratio average current after all phase changers of this phase little, illustrate that this phase can be changed by adjustment
Phase device reaches the optimum balance of this phase；
Mx when there being two-phase in three-phase > Ip then uses adjustment algorithm 1, when only one phase Mx > Ip then uses adjustment algorithm 2, when three-phase all
Adjustment algorithm 3 is then used for Mx ＜ Ip；
Degree of unbalancedness=(maximum current-minimum current)/maximum current X100%；
Described degree of unbalancedness and described adjustment algorithm 1,2,3 calculate presetting after degree of unbalancedness contrast.
Further illustrating, described a kind of three-phase current unbalance for low-voltage network is automatically adjusted algorithm, described tune
Whole algorithm 1 is as follows:
Two-phase is had to meet Mx>Ip, this two-phase is A phase and B phase, and only one phase meets Mx<Ip, and this phase is C phase,
(1) A phase and B phase phase changer all being changed to that phase of C, at this time A and B phase current is all unadjustable electric current Ma
And Mb；
(2) C phase is all phase changer electric currents plus oneself unadjustable electric current Mc, then carry out presetting after degree of unbalancedness calculate,
Return this value for algorithm flow calculate presetting after degree of unbalancedness.
Further illustrating, described a kind of three-phase current unbalance for low-voltage network is automatically adjusted algorithm, described tune
Whole algorithm 2 is as follows:
Only one phase meets Mx>Ip, this phase is A phase, and other two-phases meet Mx<Ip, and this two-phase is B phase and C phase；
(1) calculate the total current ∑ WIA of the phase changer of A phase, need the phase changer of A phase to change, give over to standby；
(2) B phase and the average current of C phase are obtained, need to be plus the phase changer total current i.e. Ip2=(Ib+Ic+ ∑ WIA)/2 of A phase；
(3) obtain Δ Ix, Δ Ix=Ip2-Ix, draw electric current to be compensated, then calculate the electric current closest to △ Ib with recursive algorithm
The phase changer combination of Ibmin, calculates the phase changer combination of the electric current Icmin closest to △ Ic with recursive algorithm；
(4) < first compensate C phase during Ibmin, the most first compensate B phase as Icmin, first compensate C phase time and satisfied phase changer combination is changed
To C phase, B phase changed to by remaining phase changer；
(5) calculate presetting after degree of unbalancedness.
Further illustrating, described a kind of three-phase current unbalance for low-voltage network is automatically adjusted algorithm, described tune
Whole algorithm 3 is as follows:
Three-phase all meets Mx < Ip；The value assuming ∑ WIx-(Ip Mx) is A > B > C；
(1) each electric current needing on the basis of non-adjustable electric current and compensating, the electric current of compensation=Ip Mx are obtained；
(2) calculate the electric current Iamin of the phase changer combination of A phase with recursive algorithm, calculate the phase changer combination of B phase with recursive algorithm
Electric current Ibmin, calculates the electric current Icmin of the phase changer combination of C phase with recursive algorithm；
(3) compare that phase current of Iamin, Ibmin and Icmin the most preferentially compensates which phase, such as Iamin closer to target current
Closer to compensating electric current, then first corresponding phase changer being combined to A phase, Ibmin is second close, then corresponding commutation
Device combines to B phase, and remaining phase changer combines to C phase；
(4) calculate presetting after degree of unbalancedness.
Further illustrating, described a kind of three-phase current unbalance for low-voltage network is automatically adjusted algorithm, and described changes
The data window of phase device is i, 24≤i≤30.
Further illustrating, described a kind of three-phase current unbalance for low-voltage network is automatically adjusted algorithm, described in
Control device is provided with central controller data storage area and phase changer data storage area.
Further illustrating, described a kind of three-phase current unbalance for low-voltage network is automatically adjusted algorithm, described in
Control device per half an hour, the most once communicates, and obtains the data of phase changer.
Further illustrating, described a kind of three-phase current unbalance for low-voltage network is automatically adjusted algorithm, and described sets
Definite value is 2%.
In sum, beneficial effects of the present invention is as follows:
The present invention solves the power distribution network unbalanced problem of low-pressure side current three-phase, proposes a kind of with branch road as controlled plant, with sky for regulation
Cycle, the balance scheme with platform district balance as target, thus reach the three-phase equilibrium of platform district, effectively promote distribution transforming power supply capacity, fall
Low low-voltage circuit is lost, and improves customer power supply quality of voltage.
Accompanying drawing explanation
Fig. 1 is the workflow 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；
Detailed description of the invention
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, aobvious
So, described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on the enforcement in the present invention
Example, the every other embodiment that field those of ordinary skill is obtained under not making creative work premise, broadly fall into this
The scope of bright protection.
Embodiment 1
A kind of three-phase current unbalance for low-voltage network is automatically adjusted algorithm, comprises the steps:
(1) arranging data window to phase changer, data window size is 24 hours, within every 1 minute, calculates once interior putting down in this 1 minute
All electric current, is then filled with data window.
(2) when beginning to cumulative average current per minute after central controller power-up initializing, after arriving first and a half hours
Just calculate average current the record of this half an hour, ensuing per half an hour and the Record Comparison of upper one and a half hours, if
Current halfhour average current is less than the average current of upper one and a half hours, then record this moment current obtain phase changer and work as
Half an hour data forward of front moment also store, if phase changer has the data of unsuccessful transmission the most at this moment to carve sent along before
To central controller, if current halfhour average current is bigger than the average current of upper one and a half hours, then judge whether to arrive 24 hours
Delay time, if do not arrived, then central controller continues cumulative current data per minute, if arriving 24 hours delay times,
Then extract phase changer data, calculate 24 hourly average electric currents.
(3) degree of unbalancedness=(maximum current-minimum current)/maximum current X100%.
(4) calculating the total current ∑ WIA, Ia of all phase changers in A phase is A phase average electric current, calculates all in B phase changing
The total current ∑ WIB, Ib of phase device is B phase average electric current, and calculating the total current ∑ WIC, Ic of all phase changers in C phase is C phase
Average current.
(5) IA is each phase total current that A branch road central controller gathers, and IB is each phase total current that B branch road central controller gathers,
IC is each phase total current that C branch road central controller gathers, MA:A branch road total current deduct after the phase changer total current of each phase can not
Regulation electric current, MB:B branch road total current deducts the unadjustable electric current after the phase changer total current of each phase, and MC:C branch road is the most electric
Stream deducts the unadjustable electric current after the phase changer total current of each phase, MA=IA-∑ WIA, MB=IB-∑ WIB, MC=IC-∑ WIC.
(6) Ip: three-phase average current Ip=(Ia+Ib+Ic)/3, Δ IA is that A phase needs to compensate electric current, wherein Δ IA=IA-Ip,
Δ IB is that B phase needs to compensate electric current, wherein Δ IB=IB-Ip, and Δ IC is that C phase needs to compensate electric current, wherein Δ IC=IC-Ip.
(7) now MA>Ip, MB>Ip, MC<Ip.A phase and B phase phase changer are all changed to that phase of C, at this time
A and B phase current is all unadjustable electric current Ma and Mb, and C phase is all phase changer electric currents unadjustable electric current plus oneself
Mc, then carry out presetting after degree of unbalancedness calculate, return this value for algorithm flow calculate presetting after degree of unbalancedness.
(8) according to step (7) calculate presetting after the uneven some degree of degree of unbalancedness and step (3) contrast,
Effect is better than 2% judgement, calculates the minimum current moment according to data half an hour, calculates the phase changer commutation time, sends phase changer and moves
Make time and action phase place, now arrive the commutation time of phase changer, restart time delay in 24 hours.
Embodiment 2
A kind of three-phase current unbalance for low-voltage network is automatically adjusted algorithm, comprises the steps:
(1) arranging data window to phase changer, data window size is 30 hours, within every 1 minute, calculates once interior putting down in this 1 minute
All electric current, is then filled with data window.
(2) when beginning to cumulative average current per minute after central controller power-up initializing, after arriving first and a half hours
Just calculate average current the record of this half an hour, ensuing per half an hour and the Record Comparison of upper one and a half hours, if
Current halfhour average current is less than the average current of upper one and a half hours, then record this moment current obtain phase changer and work as
Half an hour data forward of front moment also store, if phase changer has the data of unsuccessful transmission the most at this moment to carve sent along before
To central controller, if current halfhour average current is bigger than the average current of upper one and a half hours, then judge whether to arrive 24 hours
Delay time, if do not arrived, then central controller continues cumulative current data per minute, if arriving 24 hours delay times,
Then extract phase changer data, calculate 24 hourly average electric currents.
(3) degree of unbalancedness=(maximum current-minimum current)/maximum current X100%.
(4) calculating the total current ∑ WIA, Ia of all phase changers in A phase is A phase average electric current, calculates all in B phase changing
The total current ∑ WIB, Ib of phase device is B phase average electric current, and calculating the total current ∑ WIC, Ic of all phase changers in C phase is C phase
Average current.
(5) IA is each phase total current that A branch road central controller gathers, and IB is each phase total current that B branch road central controller gathers,
IC is each phase total current that C branch road central controller gathers, MA:A branch road total current deduct after the phase changer total current of each phase can not
Regulation electric current, MB:B branch road total current deducts the unadjustable electric current after the phase changer total current of each phase, and MC:C branch road is the most electric
Stream deducts the unadjustable electric current after the phase changer total current of each phase, MA=IA-∑ WIA, MB=IB-∑ WIB, MC=IC-∑ WIC.
(6) Ip: three-phase average current Ip=(Ia+Ib+Ic)/3, Δ IA is that A phase needs to compensate electric current, wherein Δ IA=IA-Ip,
Δ IB is that B phase needs to compensate electric current, wherein Δ IB=IB-Ip, and Δ IC is that C phase needs to compensate electric current, wherein Δ IC=IC-Ip.
(7) now MA>Ip, MB ＜ Ip, MC<Ip.Calculate the total current ∑ WIA of the phase changer of A phase, need A phase
Phase changer change, give over to standby, obtain B phase and the average current of C phase, need to be plus the phase changer total current i.e. Ip2=of A phase
(Ib+Ic+ ∑ WIA)/2, obtain Δ Ix, Δ Ix=Ip2-Ix, and this is known that electric current to be compensated, and calculates with recursive algorithm
Close to the phase changer combination of the electric current Ibmin of △ Ib, calculate the phase changer combination of the electric current Icmin closest to △ Ic with recursive algorithm,
When Icmin < first compensates C phase, the most first compensates B phase, first compensate C phase time and C is changed in satisfied phase changer combination during Ibmin
Phase, remaining phase changer changes to B phase, calculate presetting after degree of unbalancedness.
(8) according to step (7) calculate presetting after the uneven some degree of degree of unbalancedness and step (3) contrast,
Effect is not better than being better than 5%, it is not necessary to commutation also restarts time delay in 24 hours.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not limited by above-described embodiment
System, the change made, modifies, substitutes, combines, simplifies under other any Spirit Essence without departing from the present invention and principle,
All should be the substitute mode of equivalence, within being included in protection scope of the present invention.
Claims (9)
1. one kind is automatically adjusted algorithm for the three-phase current unbalance of low-voltage network, it is characterised in that comprise the steps:
(1) data window is set to phase changer, within every 1 minute, calculates once this 1 minute interior average current, be then filled with data window；
(2) when beginning to cumulative average current per minute after central controller power-up initializing, after arriving first and a half hours, this is just calculated
The average current of half an hour record, ensuing per half an hour and the Record Comparison of upper one and a half hours, if when first half is little
Time average current less than the average current of upper one and a half hours, then record this moment current to obtain phase changer current time past
Front half hour data also stores, if phase changer is to have the data of unsuccessful transmission the most at this moment to carve before sent along to central controller,
If current halfhour average current is bigger than the average current of upper one and a half hours, then judge whether to arrive 24 hours delay times,
If do not arrived, then central controller continues cumulative current data per minute, if arriving 24 hours delay times, then extracts commutation
Device data, calculate 24 hourly average electric currents, call balanced algorithm；
(3), after calling balanced algorithm, whether being better than setting value according to the effect after presetting and judge whether to need commutation, setting if be no better than
Definite value then need not commutation and restarts time delay in 24 hours, if being better than setting value, needs commutation, calculates according to data half an hour
Go out the minimum current moment, calculate the phase changer commutation time, send phase changer actuation time and action phase place, it may be judged whether arrive and change
The commutation time of phase device, without reaching, time delay always waits the commutation time judging whether to arrive phase changer, if arrived
Then restart time delay in 24 hours.
A kind of three-phase current unbalance for low-voltage network the most according to claim 1 is automatically adjusted algorithm, it is characterised in that
Described balanced algorithm is as follows:
Unadjustable electric current MxIt is expressed as follows:
Mx=Ix-∑ WIx；
Wherein, x is A, B, C；
∑ WIx: all phase changer total currents hung in certain phase；
Each phase total current that Ix: certain branch road central controller gathers；
Ip: three-phase average current Ip=(Ia+Ib+Ic)/3
Need to compensate electric current Δ Ix mutually to be expressed as follows:
Δ Ix=Ix-Ip；
According to Mx and Ip than the interpretation of result of size:
As Mx > Ip: excising the unadjustable electric current after all phase changers of this phase also big than average current, this phase should excise all commutations
Device compensates other phases；
As Mx < Ip: excise the unadjustable current ratio average current after all phase changers of this phase little, reach this phase by adjusting phase changer
Optimum balance；
Mx when there being two-phase in three-phase > Ip then uses adjustment algorithm 1, when only one phase Mx > Ip then uses adjustment algorithm 2, when three-phase all
Adjustment algorithm 3 is then used for Mx ＜ Ip；
Degree of unbalancedness=(maximum current-minimum current)/maximum current X100%；
Described degree of unbalancedness and described adjustment algorithm 1,2,3 calculate presetting after degree of unbalancedness contrast.
A kind of three-phase current unbalance for low-voltage network the most according to claim 2 is automatically adjusted algorithm, it is characterised in that
Described adjustment algorithm 1 is as follows:
Two-phase is had to meet Mx>Ip, this two-phase is A phase and B phase, and only one phase meets Mx<Ip, and this phase is C phase,
(1) A phase and B phase phase changer all being changed to that phase of C, at this time A and B phase current is all unadjustable electric current Ma
And Mb；
(2) C phase is all phase changer electric currents plus oneself unadjustable electric current Mc, then carry out presetting after degree of unbalancedness calculate,
Return this value for algorithm flow calculate presetting after degree of unbalancedness.
A kind of three-phase current unbalance for low-voltage network the most according to claim 2 is automatically adjusted algorithm, it is characterised in that
Described adjustment algorithm 2 is as follows:
Only one phase meets Mx>Ip, this phase is A phase, and other two-phases meet Mx<Ip, and this two-phase is B phase and C phase；
(1) calculate the total current ∑ WIA of the phase changer of A phase, need the phase changer of A phase to change, give over to standby；
(2) B phase and the average current of C phase are obtained, need to be plus the phase changer total current i.e. Ip2=(Ib+Ic+ ∑ WIA)/2 of A phase；
(3) obtain Δ Ix, Δ Ix=Ip2-Ix, draw electric current to be compensated, then calculate the electric current closest to △ Ib with recursive algorithm
The phase changer combination of Ibmin, calculates the phase changer combination of the electric current Icmin closest to △ Ic with recursive algorithm；
(4) < first compensate C phase during Ibmin, the most first compensate B phase as Icmin, first compensate C phase time and satisfied phase changer combination is changed
To C phase, B phase changed to by remaining phase changer；
(5) calculate presetting after degree of unbalancedness.
A kind of three-phase current unbalance for low-voltage network the most according to claim 2 is automatically adjusted algorithm, it is characterised in that
Described adjustment algorithm 3 is as follows:
Three-phase all meets Mx < Ip；The value assuming ∑ WIx-(Ip Mx) is A > B > C；
(1) each electric current needing on the basis of non-adjustable electric current and compensating, the electric current of compensation=Ip Mx are obtained；
(2) calculate the electric current Iamin of the phase changer combination of A phase with recursive algorithm, calculate the phase changer combination of B phase with recursive algorithm
Electric current Ibmin, calculates the electric current Icmin of the phase changer combination of C phase with recursive algorithm；
(3) compare which phase that phase current of Iamin, Ibmin and Icmin the most preferentially compensates closer to target current；
(4) calculate presetting after degree of unbalancedness.
A kind of three-phase current unbalance for low-voltage network the most according to claim 1 and 2 is automatically adjusted algorithm, its feature
It is: the data window of described phase changer is i, 24≤i≤30.
A kind of three-phase current unbalance for low-voltage network the most according to claim 1 and 2 is automatically adjusted algorithm, its feature
It is: described central controller is provided with central controller data storage area and phase changer data storage area.
A kind of three-phase current unbalance for low-voltage network the most according to claim 1 and 2 is automatically adjusted algorithm, its feature
It is: described central controller per half an hour the most once communicates, obtains the data of phase changer.
A kind of three-phase current unbalance for low-voltage network the most according to claim 1 and 2 is automatically adjusted algorithm, its feature
It is: described setting value is 2%.
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| CN109842136B (en) * | 2019-03-05 | 2023-04-11 | 珠海万力达电气自动化有限公司 | Three-phase unbalanced commutation system and commutation method thereof |
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| 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 |
| CN111478349A (en) * | 2020-04-16 | 2020-07-31 | 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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