CN109921445A - A kind of platform area phase-change switch control method considering branch line power-balance - Google Patents
A kind of platform area phase-change switch control method considering branch line power-balance Download PDFInfo
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Abstract
The invention discloses a kind of platform area phase-change switch control method for considering branch line power-balance, method judged whether to carry out switch commutation operation first according to the duration that platform area head end electric current tri-phase unbalance factor, distribution transformer load rate and three-phase current unbalance degree reach limit value；It after reaching commutation trigger condition, calculates that average phase current, maximum phase current are poor, determines the load that each phase needs to shift, the transfer amount expression that is positive needs to produce load, and the transfer amount expression that is negative needs to receive load；Switch motion sequence is generated according to the phase where current switch, phase current, three-phase voltage, after each switch successively acts, not only distribution transforming exit tri-phase unbalance factor is improved, but also the three-phase imbalance problem of branch line available is effectively improved.The present invention is using distribution transforming three-phase current unbalance degree as main commutation criterion, using three-phase voltage measuring value at phase-change switch as assistant criteria, improves branch line imbalance problem while solving the problems, such as distribution transforming exit three-phase imbalance.
Description
Technical field
The present invention relates to distribution technical fields, more particularly, to a kind of platform Qu Huanxiang for considering branch line power-balance
Method of controlling switch.
Background technique
Town and country power distribution network mostly uses three-phase four-wire system distribution transformer, and single-phase load accounting is big, and power supply department is supplied in layout
When the single-phase user in electric region, generally A, B, C three-phase are divided equally by number of users, but can still have serious three in real work
Phase load energy imbalance, main cause are as follows: 1) load capacity between user is different, will result in three-phase load unbalance；2)
Though load capacity is identical between user, the electricity consumption moment is asynchronous, equally will also result in three-phase load unbalance；3) uncontrollable
The access of high-power load, such as air-conditioning, electromagnetic oven, individual capacity majority is in several hectowatts to several kilowatts, and majority is single-phase confession
Electricity will also result in three-phase load unbalance.
When three-phase load unbalance, neutral point potential will shift, and line drop and power loss will increase
Add, low-voltage phenomenon occurs in the line end that will cause load heavy phase, and serious area causes household electrical appliance can not work normally.And
There is the higher problem of voltage in the single-phase user of load light phase, influences service life of equipment.The maximum allowable power output of distribution transforming will be by
The limitation of each phase rated capacity is run when distribution transforming is under threephase load imbalance operating condition, and loading a light phase just has appearance more than needed
Amount, so that the power output of distribution transforming be made to reduce.It is therefore desirable to administer to platform area three-phase imbalance problem.
Three-phase imbalance solution to the problem mainly has load commutation and two kinds of ancillary relief device at present.Load commutation
It is divided into artificial phase modulation and automatic commutation.Artificial commutation needs to carry out a large amount of preparation, low efficiency, time-consuming and laborious, manpower at
This is higher, and since load has randomness and fluctuation, artificial phase modulation is difficult to adapt to the variation of load.Automatic commutation is main
It is realized by phase-change switch, within the commutation time is up to 10ms, realizes that user does not have a power failure commutation.Additional imbalance compensation device
By carrying out reactive compensation to unbalanced three-phase load, the three-phase equilibrium in distribution transforming exit is realized.But current automatic commutation
Switch and ancillary relief device can only handle the three-phase imbalance problem in distribution transforming exit, improve distribution transforming itself to a certain extent
The problem of, and cannot be administered for the three-phase load unbalance problem of power distribution station low-voltage circuit.
Summary of the invention
The present invention in order to overcome at least one of the drawbacks of the prior art described above, provides a kind of consideration branch line power-balance
Platform area phase-change switch control method.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of platform considering branch line power-balance
Area's phase-change switch control method, comprising the following steps:
S1: distribution transforming exit voltage, current data are read in timing, calculate three-phase current unbalance degree and distribution transformer load rate；
S2: the period judge switch commutation trigger condition whether reach, if reach switch commutation trigger condition if into
Row step S3 carries out step S1 if the trigger condition for not reaching switch commutation；
S3: calculating three-phase average current, each phase out-of-balance current, determines that load produces phase and is transferred to phase；The step S3
Specifically include step s31 and step s32:
S31: calculating three-phase average current is Iav, A phase out-of-balance current Δ Ia, B phase out-of-balance current Δ Ib, C phase injustice
Weigh electric current Δ Ic:
Iav=(Ia+Ib+Ic)/3
ΔIa=Ia-Iav
ΔIb=Ib-Iav
ΔIc=Ic-Iav
Wherein, IaFor A phase current, IbFor B phase current, IcFor C phase current；
S32: the adjustment of load adjustment direction and adjustment amount is determined according to each phase out-of-balance current of the calculating in step s31
Strategy, the adjustable strategies are as follows:
If Δ Ia>ΔIbAnd Δ Ia>ΔIcWhen, Δ Ib>0、ΔIc<0；Load adjustment direction is shifted from A to C phase, is born
Lotus transfer amount is | Δ Ia|；Load adjustment direction is shifted from the opposite C phase of B, and load transfer amount is | Δ Ib|；
If Δ Ia>ΔIbAnd Δ Ia>ΔIcWhen, Δ Ib<0、ΔIc>0；Load adjustment direction is shifted from the opposite B phase of A,
Load transfer amount is | Δ Ia|；Load adjustment direction is shifted from the opposite B phase of C, and load transfer amount is | Δ Ic|；
If Δ Ia>ΔIbAnd Δ Ia>ΔIcWhen, Δ Ib<0、ΔIc<0；Load adjustment direction is shifted from the opposite B phase of A,
Load transfer amount is | Δ Ib|；Load adjustment direction is shifted from the opposite C phase of A, and load transfer amount is | Δ Ic|；
If Δ Ib>ΔIaAnd Δ Ib>ΔIcWhen, Δ Ia>0、ΔIc<0；Load adjustment direction is from the opposite C phase transfer of A, load
Transfer amount is | Δ Ia|；Load adjustment direction is shifted from the opposite C phase of B, and load transfer amount is | Δ Ib|；
If Δ Ib>ΔIaAnd Δ Ib>ΔIcWhen, Δ Ia<0、ΔIc>0；Load adjustment direction is from the opposite A phase transfer of B, load
Transfer amount is | Δ Ib|；Load adjustment direction is shifted from the opposite A phase of C, and load transfer amount is | Δ Ic|；
If Δ Ib>ΔIaAnd Δ Ib>ΔIcWhen, Δ Ia<0、ΔIc<0；Load adjustment direction is from the opposite A phase transfer of B, load
Transfer amount is | Δ Ia|；Load adjustment direction is shifted from the opposite C phase of B, and load transfer amount is | Δ Ic|；
If Δ Ic>ΔIaAnd Δ Ic>ΔIbWhen, Δ Ia>0、ΔIb<0；Load adjustment direction is from the opposite B phase transfer of A, load
Transfer amount is | Δ Ia|；Load adjustment direction is shifted from the opposite B phase of C, and load transfer amount is | Δ Ic|；
If Δ Ic>ΔIaAnd Δ Ic>ΔIbWhen, Δ Ia<0、ΔIb>0；Load adjustment direction is from the opposite A phase transfer of B, load
Transfer amount is | Δ Ib|；Load adjustment direction is shifted from the opposite A phase of C, and load transfer amount is | Δ Ic|；
If Δ Ic>ΔIaAnd Δ Ic>ΔIbWhen, Δ Ia<0、ΔIb<0；Load adjustment direction is from the opposite A phase transfer of C, load
Transfer amount is | Δ Ia|；Load adjustment direction is shifted from the opposite B phase of C, and load transfer amount is | Δ Ib|；
S4: reading phase-change switch information, obtains and switchs current phase, phase current, switchs same day action frequency, last time movement
The information such as time form switch queue；
S5: rejecting inoperable switch, forms operable switch queue；
S6: according to adjustable strategies described in step s32, phase-change switch action sequence is formed, phase-change switch is issued distant
Tactful check is ordered and is carried out in control, if degree of unbalancedness improvement is less than before tri-phase unbalance factor relatively controls after adjustment phase-change switch
2%, then it is operated without commutation；
S7: whether inquiry phase-change switch runs succeeded, and runs succeeded and goes to step S8, otherwise goes to step S9；
S8: operation of recording switch number, phase change, current information；
S9: sending remote control command again, goes to step S7, if 2 remote control commands are performed both by failure, goes to step S10；
S10: it sends and executes failure warning information.
Preferably, the trigger condition refers to that three-phase current unbalance degree is more than limit value γ and single-phase load rate in the period
It is more than specified duration more than limit value β.Trigger condition considers load factor and degree of unbalancedness factor simultaneously, needs the two while reaching each
It just can be regarded as primary effectively counting from limit value.
Preferably, it is described it is inoperable switch refer to current phase voltage be greater than switch at three-phase average voltage switch,
The out-of-limit switch of same day action frequency or current time and switch last time action moment are less than the switch at movement interval.
Preferably, the movement interval refers to the switch adjacent shortest time acted twice.
Preferably, when identical there are 2 phase out-of-balance current load symbols, it is exhausted that adjustable strategies preferentially adjust out-of-balance current
Big to value is separate, for example, Δ Ia>ΔIbAnd Δ Ia>ΔIcWhen, Δ Ib<0、ΔIc<0；|ΔIb|>|ΔIc|, then preferentially adjust A
→ B carries out A → C again.
Compared with prior art, beneficial effect is:
The present invention can only improve distribution transforming itself for mesh foreground partition three-phase imbalance problem control measures to a certain extent
Imbalance problem and cannot be open for the status that be administered of three-phase load unbalance problem of power distribution station low-voltage circuit
A kind of platform area phase-change switch control strategy considering branch line power-balance, using distribution transforming three-phase current unbalance degree as mainly
Commutation criterion, using three-phase voltage measuring value at phase-change switch as assistant criteria, realization solves to match in the case of not interrupting user power utilization
Improve branch line unbalanced power problem while becoming exit three-phase imbalance problem.
Detailed description of the invention
Fig. 1 is flow chart of the invention；
Fig. 2 is the embodiment of the present invention figure.
Specific embodiment
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；In order to better illustrate this embodiment, attached
Scheme certain components to have omission, zoom in or out, does not represent the size of actual product；To those skilled in the art,
The omitting of some known structures and their instructions in the attached drawings are understandable.Being given for example only property of positional relationship is described in attached drawing
Illustrate, should not be understood as the limitation to this patent.
The same or similar label correspond to the same or similar components in the attached drawing of the embodiment of the present invention；It is retouched in of the invention
In stating, it is to be understood that if the orientation or positional relationship for having the instructions such as term " on ", "lower", "left", "right" " length " " short " is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore describes position in attached drawing
The term for setting relationship only for illustration, should not be understood as the limitation to this patent, for the ordinary skill people of this field
For member, the concrete meaning of above-mentioned term can be understood as the case may be.
Below by specific embodiment, and in conjunction with attached drawing, technical scheme of the present invention is further described:
Embodiment 1
Fig. 1 to Fig. 2 is the first embodiment of the present invention, a kind of platform area phase-change switch control considering branch line power-balance
Method the following steps are included:
S1: distribution transforming exit voltage, current data are read in timing, calculate three-phase current unbalance degree and distribution transformer load rate；
S2: the period judge switch commutation trigger condition whether reach, if reach switch commutation trigger condition if into
Row step S3 carries out step S1 if the trigger condition for not reaching switch commutation；
S3: calculating three-phase average current, each phase out-of-balance current, determines that load produces phase and is transferred to phase；Step S3 is main
Including step s31 and step s32:
S31: calculating three-phase average current is Iav, A phase out-of-balance current Δ Ia, B phase out-of-balance current Δ Ib, C phase injustice
Weigh electric current Δ Ic:
Iav=(Ia+Ib+Ic)/3
ΔIa=Ia-Iav
ΔIb=Ib-Iav
ΔIc=Ic-Iav
Wherein, IaFor A phase current, IbFor B phase current, IcFor C phase current；
S32: the adjustment plan of load adjustment direction and adjustment amount is determined according to each phase out-of-balance current calculated in s31
Slightly, see Table 1 for details:
S4: reading phase-change switch information, obtains and switchs current phase, phase current, switchs same day action frequency, last time movement
The information such as time form switch queue；
S5: rejecting inoperable switch, forms operable switch queue；
S6: according to adjustable strategies described in step s32, phase-change switch action sequence is formed, phase-change switch is issued distant
Control, which is ordered, simultaneously carries out tactful check, if degree of unbalancedness improves to be less than and sets before tri-phase unbalance factor relatively controls after adjustment phase-change switch
Definite value is then operated without commutation；
S7: whether inquiry phase-change switch runs succeeded, and runs succeeded and goes to step S8, otherwise goes to step S9；
S8: operation of recording switch number, phase change, current information；
S9: sending remote control command again, goes to step S7, if 2 remote control commands are performed both by failure, goes to step S10；
S10: it sends and executes failure warning information.
1 balancing the load of table shifts adjustable strategies
In order to be further illustrated to this method, it is illustrated by taking certain area's real data as an example, steps are as follows:
Step S1: reading data, calculates tri-phase unbalance factor and load factor.To simplify the calculation, it is assumed that each secondary measurement information
It is constant, take capacity of distribution transform SN=200kVA.
Terminal measuring value: Ua=220.5V, Ia=80.0A, Ub=220.7V, Ib=60.0A, Uc=220.8V, Ic=
55.0A.It is as shown in table 2 to switch measurement information:
2 phase-change switch measurement information table of table
A phase load rate=(220.5*80.0)/(200*1000/3)=26.5%
B phase load rate=(220.7*60.0)/(200*1000/3)=19.9%
C phase load rate=(220.8*55.0)/(200*1000/3)=18.2%
Step S2: judge whether the trigger condition for reaching switch commutation.Three-phase current unbalance degree is 31.25%, is greater than
Not three-phase current unbalance degree limit value 15%, A phase load rate 26.5% are greater than single-phase load rate limit value 20%, due to each measurement
Data are identical, therefore meet trigger condition.
Step S3: out-of-balance current is calculated, determines load shift direction.
ΔIa=Ia-Iav=80.0-65.0=15.0A
ΔIb=Ib-Iav=60.0-65.0=-5.0A
ΔIc=Ic-Iav=55.0-65.0=-10.0A
According to table 1, A phase load is to B phase transfer 5A, to C phase transfer 10A.
Step S4: read switch information forms switch queue.
As shown in table 2, share 5 switches, switch distribution as shown in Fig. 2, wherein A phase has switched 3, by electric current from greatly to
Small ranking results are 2,1,5.
Step S5: the A phase voltage highest of switch 5 illustrates that A phase load is most light in present branch, and switch 5 should not shift negative
Lotus proposes switch 5 from switch queue.
Step S6, from step 3 it is found that A phase is needed to B phase transfer 5A load, to C to transfer 10A load, therefore order sequence
It is classified as switch 2 and C phase is switched to by A phase, switch 1 switches to B phase by A phase.A phase current 68A, B phase current 63A, C phase electricity after commutation
64A is flowed, three-phase current unbalance degree is (68-63)/68*100%=7.4%.
Step S7 to step S10 is operating procedure, and details are not described herein again.
This control method avoid switch 5 by A phase switch to C phase cause 3 degree of unbalancedness of branch increase, line loss increase
And so on.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (4)
1. a kind of platform area phase-change switch control method for considering branch line power-balance, which comprises the following steps:
S1: distribution transforming exit voltage, current data are read in timing, calculate three-phase current unbalance degree and distribution transformer load rate；
S2: the period judges whether the trigger condition for switching commutation reaches, and is walked if the trigger condition for reaching switch commutation
Rapid S3 carries out step S1 if the trigger condition for not reaching switch commutation；
S3: calculating three-phase average current, each phase out-of-balance current, determines that load produces phase and is transferred to phase；The step S3 is specific
Including step s31 and step s32:
S31: calculating three-phase average current is Iav, A phase out-of-balance current Δ Ia, B phase out-of-balance current Δ Ib, C phase out-of-balance current
ΔIc:
Iav=(Ia+Ib+Ic)/3
ΔIa=Ia-Iav
ΔIb=Ib-Iav
ΔIc=Ic-Iav
Wherein, IaFor A phase current, IbFor B phase current, IcFor C phase current；
S32: the adjustment plan of load adjustment direction and adjustment amount is determined according to each phase out-of-balance current of the calculating in step s31
Slightly, the adjustable strategies are as follows:
If Δ Ia>ΔIbAnd Δ Ia>ΔIcWhen, Δ Ib>0、ΔIc<0；Load adjustment direction is shifted from A to C phase, and load turns
Shifting amount is | Δ Ia|；Load adjustment direction is shifted from the opposite C phase of B, and load transfer amount is | Δ Ib|；
If Δ Ia>ΔIbAnd Δ Ia>ΔIcWhen, Δ Ib<0、ΔIc>0；Load adjustment direction is shifted from the opposite B phase of A, load
Transfer amount is | Δ Ia|；Load adjustment direction is shifted from the opposite B phase of C, and load transfer amount is | Δ Ic|；
If Δ Ia>ΔIbAnd Δ Ia>ΔIcWhen, Δ Ib<0、ΔIc<0；Load adjustment direction is shifted from the opposite B phase of A, load
Transfer amount is | Δ Ib|；Load adjustment direction is shifted from the opposite C phase of A, and load transfer amount is | Δ Ic|；
If Δ Ib>ΔIaAnd Δ Ib>ΔIcWhen, Δ Ia>0、ΔIc<0；It is shifted from the opposite C phase transfer of A, load in load adjustment direction
Amount is | Δ Ia|；Load adjustment direction is shifted from the opposite C phase of B, and load transfer amount is | Δ Ib|；
If Δ Ib>ΔIaAnd Δ Ib>ΔIcWhen, Δ Ia<0、ΔIc>0；It is shifted from the opposite A phase transfer of B, load in load adjustment direction
Amount is | Δ Ib|；Load adjustment direction is shifted from the opposite A phase of C, and load transfer amount is | Δ Ic|；
If Δ Ib>ΔIaAnd Δ Ib>ΔIcWhen, Δ Ia<0、ΔIc<0；It is shifted from the opposite A phase transfer of B, load in load adjustment direction
Amount is | Δ Ia|；Load adjustment direction is shifted from the opposite C phase of B, and load transfer amount is | Δ Ic|；
If Δ Ic>ΔIaAnd Δ Ic>ΔIbWhen, Δ Ia>0、ΔIb<0；It is shifted from the opposite B phase transfer of A, load in load adjustment direction
Amount is | Δ Ia|；Load adjustment direction is shifted from the opposite B phase of C, and load transfer amount is | Δ Ic|；
If Δ Ic>ΔIaAnd Δ Ic>ΔIbWhen, Δ Ia<0、ΔIb>0；It is shifted from the opposite A phase transfer of B, load in load adjustment direction
Amount is | Δ Ib|；Load adjustment direction is shifted from the opposite A phase of C, and load transfer amount is | Δ Ic|；
If Δ Ic>ΔIaAnd Δ Ic>ΔIbWhen, Δ Ia<0、ΔIb<0；It is shifted from the opposite A phase transfer of C, load in load adjustment direction
Amount is | Δ Ia|；Load adjustment direction is shifted from the opposite B phase of C, and load transfer amount is | Δ Ib|；
S4: reading phase-change switch information, obtains and switchs current phase, and phase current switchs same day action frequency, actuation time last time
Etc. information, formed switch queue；
S5: rejecting inoperable switch, forms operable switch queue；
S6: according to adjustable strategies described in step s32, forming phase-change switch action sequence, issues remote control life to phase-change switch
Tactful check is enabled and carries out, if degree of unbalancedness improves less than 2% before tri-phase unbalance factor relatively controls after adjustment phase-change switch,
It is operated without commutation；
S7: whether inquiry phase-change switch runs succeeded, and runs succeeded and goes to step S8, otherwise goes to step S9；
S8: operation of recording switch number, phase change, current information；
S9: sending remote control command again, goes to step S7, if 2 remote control commands are performed both by failure, goes to step S10；
S10: it sends and executes failure warning information.
2. a kind of platform area phase-change switch control method for considering branch line power-balance according to claim 1, feature
Be: in the step S2, the trigger condition refers in the period that three-phase current unbalance degree is more than limit value γ and single-phase
Load factor is more than that limit value β is more than specified duration.
3. a kind of platform area phase-change switch control method for considering branch line power-balance according to claim 1 or 2, special
Sign is: in the step S5, inoperable switch refers to that the voltage of current phase is greater than three-phase average voltage at switch
Switch, the out-of-limit switch or current time of same day action frequency with switch last time action moment be less than opening for movement interval
It closes.
4. a kind of platform area phase-change switch control method for considering branch line power-balance according to claim 3, feature
Be: the movement interval refers to the switch adjacent shortest time acted twice.
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| CN110429592A (en) * | 2019-08-06 | 2019-11-08 | 国网四川省电力公司电力科学研究院 | A kind of 10kV route pressure regulator installation site and Capacity Selection method |
| CN110716091A (en) * | 2019-11-27 | 2020-01-21 | 国网冀北电力有限公司电力科学研究院 | Three-phase unbalance on-line monitoring method based on four-stage balance phase modulation algorithm |
| CN110797887A (en) * | 2019-09-23 | 2020-02-14 | 南京软核科技有限公司 | Low-voltage transformer area three-phase unbalance management self-decision control method |
| CN111162548A (en) * | 2020-01-03 | 2020-05-15 | 深圳供电局有限公司 | Commutation switch control method based on general branch control mode |
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| CN110429592B (en) * | 2019-08-06 | 2022-11-08 | 国网四川省电力公司电力科学研究院 | 10kV line voltage regulator installation position and capacity selection method |
| CN110797887A (en) * | 2019-09-23 | 2020-02-14 | 南京软核科技有限公司 | Low-voltage transformer area three-phase unbalance management self-decision control method |
| CN110797887B (en) * | 2019-09-23 | 2023-09-22 | 南京软核科技有限公司 | Low-voltage area three-phase imbalance treatment self-decision control method |
| CN110716091A (en) * | 2019-11-27 | 2020-01-21 | 国网冀北电力有限公司电力科学研究院 | Three-phase unbalance on-line monitoring method based on four-stage balance phase modulation algorithm |
| CN111162548A (en) * | 2020-01-03 | 2020-05-15 | 深圳供电局有限公司 | Commutation switch control method based on general branch control mode |
| CN111162548B (en) * | 2020-01-03 | 2022-03-08 | 深圳供电局有限公司 | Commutation switch control method based on general branch control mode |
| CN111323657A (en) * | 2020-03-11 | 2020-06-23 | 北京市腾河智慧能源科技有限公司 | Intelligent identification mean value calculation method and device |
| CN111478348A (en) * | 2020-04-15 | 2020-07-31 | 广东电网有限责任公司广州供电局 | Three-phase load balancing method and device, electronic equipment and readable storage medium |
| CN111614109A (en) * | 2020-05-06 | 2020-09-01 | 许继集团有限公司 | Load three-phase unbalance management method and system considering user side energy access |
| CN113809762A (en) * | 2021-08-18 | 2021-12-17 | 杭州宇诺电子科技有限公司 | Three-phase unbalance adjusting device and method based on phase change switch |
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