CN108964092B - The method of gradual strategy adjustment low-voltage network imbalance of three-phase voltage - Google Patents
The method of gradual strategy adjustment low-voltage network imbalance of three-phase voltage Download PDFInfo
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- CN108964092B CN108964092B CN201710362648.7A CN201710362648A CN108964092B CN 108964092 B CN108964092 B CN 108964092B CN 201710362648 A CN201710362648 A CN 201710362648A CN 108964092 B CN108964092 B CN 108964092B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The present invention relates to technical field of electric power, disclose a kind of network-building method it is simpler rationally real-time, reliability and accuracy are higher, and versatility is stronger, the lower method for administering three-phase load unbalance of equipment input cost.The method is that each phase-change switch sequentially enters its corresponding work time zone in platform areaCurrent non-equilibrium among three phase voltages interior, that phase-change switch is detected with itselfFor reference, with preset non-equilibrium among three phase voltages threshold valueWith estimate non-equilibrium among three phase voltages after commutationIt is compared, judges whether to execute and how to execute commutation movement；After a work time zone, into subsequent work time zone, and in timingMoment, next phase-change switch entered working condition, next phase-change switch is according to new low voltage power distribution network three-phase imbalance situation, judge whether to execute commutation movement, and so on, the threshold range that platform area low-voltage network non-equilibrium among three phase voltages tend to setting is gradually adjusted with progressive manner.
Description
Technical field
The invention belongs to technical field of electric power, and in particular to a kind of gradual strategy adjustment low-voltage network three-phase voltage is not
The method of balance.
Background technique
In low-voltage network, three-phase imbalance refers to that three-phase voltage (or electric current) amplitude is inconsistent in the power system,
And difference in magnitude is more than prescribed limit.Three-phase imbalance will cause route, the electric energy loss of distribution transformer increases, and distribution transforming power output subtracts
Less, distribution transforming generates zero-sequence current, and motor efficiency reduces, and influences the safe operation of electrical equipment.Therefore, in real power supply process
In, single-phase and two phase loads are evenly distributed on three-phase by power department as far as possible, to keep three-phase equilibrium；And it is opened using commutation
It is one of most common means that association net, which adjusts sharing of load,.
According to non-equilibrium among three phase voltages meter cited in GB/T 15543-2008 " power supply quality imbalance of three-phase voltage "
Calculate formula:
In formula: α --- rotation operator,Point
It Wei not positive sequence and negative sequence component；--- A phase, B phase and C phase voltage vector.
China Patent Publication No. CN 105846453A, publication date on 08 10th, 2016, invention and created name was controlled for one kind
The method for managing low-voltage network three-phase load unbalance.It is uneven that this application discloses a kind of improvement low-voltage network three-phase loads
The method of weighing apparatus, the method are the three-phase current data that distribution transformer low-pressure side is collected using platform area controller, outlet electric leakage
The electric current and phase data of protective switch load data, user power utilization load data and phase-change switch carry out analytical calculation, obtain
The degree of unbalancedness of each outlet out, when limit value of the discovery degree of unbalancedness greater than setting, and degree of unbalancedness is held time more than setting
It when adjustment time, provides optimal " uneven adjusting method ", automatic remote control phase-change switch, carries out Load Regulation, completion respectively goes out
Line three-phase load is reallocated, and each outlet three-phase load is made to be in state in a basic balance, negative with the three-phase that this reaches low-voltage circuit
Lotus equilibrium state.Disadvantage is that administering method needs to form physics communication network by platform area controller and phase-change switch
Network, networking cost are high；Communication network is affected by technical conditions, environment and communication distance, Yi Fasheng communication signal failure, drop
Low regulation effect；Hardware configuration is complicated, and enforcement difficulty is at high cost greatly；It needs to adjust referring to transformer load rate size stepping, spirit
Activity and bad adaptability；Commutation adjustment interval time is long, cannot accurately realize the real-time adjustment of low-voltage network three-phase equilibrium, drops
Low line loss effect is unobvious；Separate unit phase-change switch failure in network is easy to cause network system overall failure.
Summary of the invention
The present invention overcomes deficiency in the prior art, it is simpler rationally to provide a kind of network-building method, real-time, can
Higher by property and accuracy, versatility is stronger, the lower method for adjusting low-voltage network three-phase imbalance of equipment input cost.
In order to solve the above-mentioned technical problem, the present invention is achieved by the following technical solutions: the method is in platform area
Each phase-change switch sequentially enters in its corresponding work time zone T, and the current three-phase voltage that phase-change switch is detected with itself is uneven
Weighing apparatus degree ε is compared for non-equilibrium among three phase voltages ε ' after reference, with the threshold value δ of preset non-equilibrium among three phase voltages and commutation
Compared with, judge whether execute and how to execute commutation movement；After a work time zone, into subsequent work time zone, and
Timing TnMoment next phase-change switch enters working condition, next phase-change switch according to new low voltage power distribution network three-phase not
Equilibrium condition judges whether that executing commutation acts, and so on, platform area low-voltage network three-phase is gradually adjusted with progressive manner
Voltage unbalance factor tends to the threshold range of setting；Specific step is as follows:
(1) according in platform area phase-change switch quantity n set phase-change switch number 1#, 2#, 3# ... n#, share out the work time zone
T and timing Tn, set the threshold value δ of non-equilibrium among three phase voltages；
(2) m# phase-change switch detects its lead-in wire terminal three-phase voltage, phase angle, phase sequence and load within the corresponding time zone T period
Power, and calculate current non-equilibrium among three phase voltages ε；ε and δ are compared, as ε≤δ, m# phase-change switch is failure to actuate；Work as ε
When > δ, m# phase-change switch, will according to non-equilibrium among three phase voltages ε ' after the parameters estimation commutation including bearing power
ε ' and ε are compared, and as ε ' >=ε, m# phase-change switch is failure to actuate, and as ε ' < ε, it is dynamic that m# phase-change switch executes corresponding commutation
Make；
(3) enter before the T of subsequent work time zone, m# phase-change switch enters dormant state and subsequent cycle period m # is waited to open
The arrival for closing corresponding timing, when switching time is timing Tm+1When, m+1# phase-change switch enters working condition, m+1# phase-change switch
Step (2) and step (3) are repeated within the corresponding time zone T period；
(4) after a cycle period terminates T × n, into the subsequent cycle period, 1#, 2#, 3# ... n# phase-change switch according to
It is secondary to enter corresponding work time zone T, and repeat step (2), step (3) and step (4).
The phase-change switch is voltage detecting type, has adaptation function；Phase-change switch is by Y sampling, by hits
It is calculated according to the method defined according to GB/T 15543-2008 and obtains current non-equilibrium among three phase voltages ε, obtained in Y sampling
Current non-equilibrium among three phase voltages ε is all larger than in the case of the threshold value δ of non-equilibrium among three phase voltages, just estimates three-phase voltage after commutation
Degree of unbalancedness ε '.
All phase-change switch clock times keep synchronizing, and all phase-change switches are equipped with clock reserve battery,
After switch circuit breaking, system reserve battery is voluntarily enabled, and is powered for clock crystal oscillator, guarantees phase-change switch in accidental power-off and maintenance
In the case of, clock time keeps operating, and after the completion of restoring electricity or repair again, being not required to reset clock sequence can be extensive
It is multiple to use；Phase-change switch is run after a certain period of time, is carried out time service to clock, is corrected the time difference.
Within the time zone T period, be up to a phase-change switch executes commutation movement, and it is dynamic at most to generate a commutation
Make, remaining phase-change switch in a dormant state and waits the arrival of corresponding timing.
The influence factor of non-equilibrium among three phase voltages ε ' includes P, γ and K after the commutation, and wherein P is phase-change switch load
Power, γ are the influence coefficient of voltage unbalance factor, are calculated and are generated by historical data, it is according to clock time that K, which is period parameters,
The period divided with platform area load curve characteristics；Phase-change switch records the non-equilibrium among three phase voltages situation of change before and after commutation,
By before and after bearing power, commutation non-equilibrium among three phase voltages variable quantity and the period formed corresponding relationship storage, record nearest X
Data before and after secondary commutation analyze the influence coefficient gamma of phase-change switch bearing power P and voltage unbalance factor, open as commutation
It closes with the reference quantity for executing commutation movement in the period next time.
Phase-change switch is used for the first time, γ initial value should be set according to the load chart of platform area these last few days；Phase-change switch
Into after working condition, automatic collection is registered one's residence parameters of the place including three-phase voltage, phase angle, phase sequence, bearing power,
Calculate and record current non-equilibrium among three phase voltages ε, if ε > δ, reads clock time, differentiate its locating period K, according to P,
The value of γ and K estimates non-equilibrium among three phase voltages ε ' after commutation, if ε ' < ε, executes corresponding commutation movement, commutation is completed
Moment afterwards, phase-change switch acquire data, calculate new current non-equilibrium among three phase voltages ε, and record storage is to relevant parameter
Set in.
Phase-change switch is that every phase-change switch distribution is independent according to time series establishment number, timing and time zone in platform area
Work time zone, the dynamic change of power grid three-phase voltage, phase difference value has an impact the movement of every phase-change switch；Time
The variation of sequence and the variation of platform area low-voltage network three-phase voltage, phase difference value, all phase-change switches in joint effect platform area
Movement, be the basis that platform area phase-change switch is able to network consisting.
The phase-change switch is mounted on the family electricity box of single-phase load and divides before electronic box, the number n of phase-change switch in platform area
It should be less than 1/3 with the ratio of family table sum.
The phase-change switch should be selectively mounted to the family electricity box of single-phase load and divide before electronic box, and installation site is convenient for applying
Work and sharing of load.
Compared with prior art, the beneficial effects of the present invention are: the present invention breaks the improvement side of conventional three-phase imbalance
Method is that every phase-change switch distributes independent work time zone, low-voltage network three-phase voltage, phase in platform area according to time series
The dynamic change of difference has an impact the movement of every phase-change switch；The variation of time series and platform area low-voltage network three
The variation of phase voltage, phase difference value, the movement of all phase-change switches, is that platform area phase-change switch is formed in joint effect platform area
The basis of network；Phase-change switch according to detect three-phase voltage, phase sequence, phase angle, calculate non-equilibrium among three phase voltages and
With the degree of unbalancedness threshold value comparison of setting, judge whether to execute commutation movement, extremely by the adjustment of progressive mode step by step three-phase electric load
Equilibrium state；The method is not required to host computer and phase-change switch sets up physical connection network, is not required to set up special physical communication net
Network transmission phase-change switch controls signal and electric network data and has simplified production so as to avoid communication module and upper computer module is used
Product structure, has saved manufacturing cost.Adverse circumstances and the negative effect of telecommunication bring are avoided, phase-change switch is improved
The reliability and platform area network operation efficiency of work.
Detailed description of the invention
Fig. 1 is phase-change switch working cycles schematic table；
Fig. 2 is that phase-change switch adjusts three-phase imbalance networking schematic illustration；
Fig. 3 is phase-change switch platform area's network installation schematic diagram；
Fig. 4 is the connection scheme of installation of phase-change switch Yu family electricity box；
Fig. 5 is the flow chart of phase-change switch internal operating program.
In figure: t: clock time, Tn: phase-change switch originates operation time, Km: period parameters,A phase current voltage to
Amount,The current voltage vector of B phase,The current voltage vector of C phase,Voltage vector after A phase commutation,After B phase commutation
Voltage vector,Voltage vector after C phase commutation, I: phase-change switch present load current, I ': phase-change switch commutation back loading electricity
Stream, ε: current non-equilibrium among three phase voltages, ε ': non-equilibrium among three phase voltages after commutation, ε h: three-phase voltage is uneven after actual measurement commutation
Weighing apparatus degree, V1: current positive-sequence component, V2: current negative sequence component, V1 ': positive-sequence component after commutation, V2 ': negative sequence component after commutation, P:
Phase-change switch bearing power, δ: the threshold value of non-equilibrium among three phase voltages, γ: the influence coefficient of voltage unbalance factor.
Specific embodiment
The present invention is described in detail below.Such as "comprising" mentioned throughout the specification and claims
Or " comprising " is an open language, therefore should be construed to " including but not limited to ".Specification subsequent descriptions are to implement the present invention
Better embodiment, so the description is the range that is not intended to limit the invention for the purpose of the rule of specification.
Protection scope of the present invention is as defined by the appended claims.
As shown in Figures 1 to 5, the method that gradual strategy administers low-voltage network three-phase imbalance, is respectively changed in platform area
Mutually switch sequentially enters in its corresponding work time zone T, the current non-equilibrium among three phase voltages ε that phase-change switch is detected with itself
It is compared, judges for non-equilibrium among three phase voltages ε ' after reference, with the threshold value δ of preset non-equilibrium among three phase voltages and commutation
Whether execute and how to execute commutation movement；After a work time zone, into subsequent work time zone, and in timing TnWhen
It carves next phase-change switch and enters working condition, next phase-change switch is according to new low voltage power distribution network three-phase imbalance shape
Condition judges whether that executing commutation acts, and so on, platform area low-voltage network three-phase voltage is gradually adjusted with progressive manner not
The degree of balance tends to the threshold range of setting.
As shown in Figure 2 and Figure 5, described method includes following steps:
(1) according in platform area phase-change switch quantity n set phase-change switch number 1#, 2#, 3# ... n#, share out the work time zone
T and timing Tn, set the threshold value δ of non-equilibrium among three phase voltages；
(2) m# phase-change switch detects its lead-in wire terminal three-phase voltage, phase angle, phase sequence and load within the corresponding time zone T period
Power, and calculate current non-equilibrium among three phase voltages ε；ε and δ are compared, as ε≤δ, m# phase-change switch is failure to actuate；Work as ε
When > δ, m# phase-change switch, will according to non-equilibrium among three phase voltages ε ' after the parameters estimation commutation including bearing power
ε ' and ε are compared, and as ε ' >=ε, m# phase-change switch is failure to actuate, and as ε ' < ε, it is dynamic that m# phase-change switch executes corresponding commutation
Make；
(3) enter before the T of subsequent work time zone, m# phase-change switch enters dormant state and subsequent cycle period m # is waited to open
The arrival for closing corresponding timing, when switching time is timing Tm+1When, m+1# phase-change switch enters working condition, m+1# phase-change switch
Step (2) and step (3) are repeated within the corresponding time zone T period；
(4) after a cycle period terminates T × n, into the subsequent cycle period, 1#, 2#, 3# ... n# phase-change switch according to
It is secondary to enter corresponding work time zone T, and repeat step (2), step (3) and step (4).
The phase-change switch is voltage detecting type, has adaptation function；Phase-change switch is by Y sampling, by hits
It is calculated according to the method defined according to GB/T 15543-2008 and obtains current non-equilibrium among three phase voltages ε, obtained in Y sampling
In the case that current non-equilibrium among three phase voltages ε is all larger than the threshold value δ of non-equilibrium among three phase voltages, three-phase electricity after commutation is just estimated
Press degree of unbalancedness ε '.
All phase-change switch clock times keep synchronizing, and all phase-change switches are equipped with clock reserve battery,
After switch circuit breaking, system reserve battery is voluntarily enabled, and is powered for clock crystal oscillator, guarantees phase-change switch in accidental power-off and maintenance
In the case of, clock time keeps operating, and after the completion of restoring electricity or repair again, being not required to reset clock sequence can be extensive
It is multiple to use；After phase-change switch is run 3~6 months, time service is carried out to clock, corrects the time difference.
Within the time zone T period, be up to a phase-change switch executes commutation movement, and it is dynamic at most to generate a commutation
Make, remaining phase-change switch in a dormant state and waits the arrival of corresponding timing.
The influence factor of non-equilibrium among three phase voltages ε ' includes P, γ and K after the commutation, and wherein P is phase-change switch load
Power, γ are the influence coefficient of voltage unbalance factor, are calculated and are generated by historical data, it is according to clock time that K, which is period parameters,
The period divided with platform area load curve characteristics；Phase-change switch records the non-equilibrium among three phase voltages situation of change before and after commutation,
By before and after bearing power, commutation non-equilibrium among three phase voltages variable quantity and the period formed corresponding relationship storage, record nearest X
Data before and after secondary commutation analyze the influence coefficient gamma of phase-change switch bearing power P and voltage unbalance factor, open as commutation
It closes with the reference quantity for executing commutation movement in the period next time.
Phase-change switch is used for the first time, γ initial value should be set according to the load chart of platform area these last few days；Phase-change switch
Into after working condition, automatic collection is registered one's residence parameters of the place including three-phase voltage, phase angle, phase sequence, bearing power,
Calculate and record current non-equilibrium among three phase voltages ε, if ε > δ, reads clock time, differentiate its locating period K, according to P,
The value of γ and K estimates non-equilibrium among three phase voltages ε ' after commutation, if ε ' < ε, executes corresponding commutation movement, commutation is completed
Moment afterwards, phase-change switch acquire data, calculate new current non-equilibrium among three phase voltages ε, and record storage is to relevant parameter
Set in.
Phase-change switch is that every phase-change switch distribution is independent according to time series establishment number, timing and time zone in platform area
Work time zone, the dynamic change of power grid three-phase voltage, phase difference value has an impact the movement of every phase-change switch；Time
The variation of sequence and the variation of platform area low-voltage network three-phase voltage, phase difference value, all phase-change switches in joint effect platform area
Movement, be the basis that platform area phase-change switch is able to network consisting.
As shown in Figure 3 and Figure 4, the phase-change switch is mounted on the family electricity box of single-phase load and divides before electronic box, in platform area
The number n of phase-change switch and the ratio of family table sum should be less than 1/3.The phase-change switch should be selectively mounted to the family of single-phase load
Electricity box and divide before electronic box, and installation site is convenient for construction and sharing of load.
As shown in Figures 1 to 5, the present invention is to work out the working sequence T of phase-change switch in platform area based on time seriesnWith
Work time zone T, and every to complete a circulation with T × n for a cycle period, all switches re-read clock time, starts new
Cycle period.Phase-change switch judges whether that executing commutation moves according to time series and low-voltage network non-equilibrium among three phase voltages
Make and how to execute commutation movement.Each phase-change switch independent acquisition place of registering one's residence includes three-phase piezoelectric voltage, phase sequence, phase in platform area
Parameters including parallactic angle, bearing power, calculate currently and commutation after non-equilibrium among three phase voltages, judge whether commutation with
How commutation, and serially enter and exit working condition sequentially in time, commutation of every execution movement matches low pressure
Power grid non-equilibrium among three phase voltages tend to the degree of unbalancedness threshold range of setting.
It is, according to phase-change switch quantity n in platform area, to determine circulation time that the method for cycle period is worked out in the present invention
Length is T × n, and every to pass through 24 hours, all phase-change switches restart timing, the new working cycles since 1# switch.
The present invention works according to the gradual triggering phase-change switch of clock time sequence, continuous cycle detection platform area low-voltage network
Degree of unbalancedness and Load adjustment distribution are realized that Contrast tuned imaging platform area low-voltage network non-equilibrium among three phase voltages maintain and are set
Determine in threshold range, i.e., adjusts low-voltage network three-phase imbalance problem using gradual strategy.
Phase-change switch locates the factors tune such as non-equilibrium among three phase voltages, bearing power, clock time according to registering one's residence in the present invention
Sharing of load is saved, the adjusting of transformer load rate size stepping, flexibility and better adaptability are needed not refer to.Phase-change switch acquisition
Clock time, as affiliated timing TnTriggering enters operating mode when arrival, in operating mode time interval, according to place of registering one's residence
Non-equilibrium among three phase voltages judge whether commutation after the commutation of current non-equilibrium among three phase voltages and estimation.
The phase-change switch is by 3~8 samplings, by sampled data method according to defined in GB/T 15543-2008
It calculates and obtains current non-equilibrium among three phase voltages ε, be all larger than three in the current non-equilibrium among three phase voltages ε that 3~8 samplings obtain
In the case of the threshold value δ of phase voltage degree of unbalancedness, non-equilibrium among three phase voltages ε ' after commutation is just estimated.
In the present invention, the sharing of load of each separately adjustable corresponding branch of phase-change switch；And the phase-change switch, it can basis
Non-equilibrium among three phase voltages threshold value in standard GB/T/T 15543-2008 setting platform area, the access of intelligent phase-change switch can make
Low-voltage network non-equilibrium among three phase voltages are not more than 4% rule far below being not more than 2% in GB/T 15543-2008 in short-term
It is fixed.It is even lower that non-equilibrium among three phase voltages setting value can reach 0.8%；The load of separate unit phase-change switch control is smaller, then adjusts
The precision for saving low-voltage network non-equilibrium among three phase voltages is higher.
It is shown according to same area's electricity consumption rule statistical data, same area's power load is 24 small with one day at all seasons
When within, all in rule variation, adjacent several days load curves are essentially identical；Therefore the present invention is based on platform area power load rule
Rule, will be divided into K period daily, can eliminate the influence that distribution transformer load power variation in platform area generates；Such as according to certain
Platform area power load rule was divided into 16 periods for one day, and 9 points to 12 points and 17 points to 22 points, be peak of power consumption section, platform area
Electric power fluctuation is obvious, according to a period per hour, is divided into 8 periods；From 8 points to 9 point, 12 points to 17 points and 22 points
It is the flat section of electricity consumption to 23 points, electric power fluctuation in platform area is relatively obvious, also according to one period of each hour, is divided into 7
Period；It is low power consumption section from 23 points to 8 points of next day, platform Qu Taiqu load general power is lower and remains unchanged substantially, can be used as
One period；The variation of each period Nei Tai area's electricity consumption total load less, while these last few days in section, platform area electricity consumption total load
It is almost the same, therefore within each period, platform area load general power can be regarded as being basically unchanged, in this, as data before commutation point
The basis of analysis can not have to the shadow for considering platform area transformer total load variation non-equilibrium among three phase voltages variable quantity caused by commutation
Ring, more convenient measuring and calculating phase-change switch bearing power and in the locating period non-equilibrium among three phase voltages variable quantity relationship.Platform
Area's phase-change switch network by the multiple repairing weld analysis to nearest corresponding period voltage unbalance factor it is automatic adapt to throughout the year and
24 hours one day load variations, and do not have to entire platform area low voltage power distribution network operating parameter is sampled, is communicated, is analyzed and
Control.So the simpler reasonable, real-time of network-building method, reliability and accuracy are higher, versatility is stronger, and input cost is more
It is low.
The present invention is different from conventional platform district's groups network method, and partial branch installs phase-change switch, and partial branch does not install commutation
It switchs, the quantity of phase-change switch is installed in power distribution station and the ratio of family table sum should not exceed 1/3, three-phase equilibrium can be met
Regulatory demand；Conventional platform district's groups net mounting means needs all branches in platform area to be respectively mounted phase-change switch, and platform area domestic demand is pacified
Fill host computer；The network-building method investment reduction 50-70% of the invention compared to more conventional network-building method；Phase-change switch and family electricity box
Connection relationship is as shown in Figure 3 and Figure 4.
Below with total family table number T in platform areab=100 families, family table rated current Ie are 40A, and one, every 4 family electricity box are to implement
Example is further described in detail the present invention.
(1) determine that the quantity n for installing intelligent phase-change switch, circular are as follows before platform area is installed first:
4 families table institute's on-load P=40A × 4 × 0.8=128A, wherein 0.8 be customer charge while rate coefficient.Choosing
With the phase-change switch of 150A capacity, the quantity S of phase-change switch is at most installed in platform areamax=Tb/Sb1=100/4=25, in platform area
The minimum number S of phase-change switch is installedmin=(Tb/Sb1)/2=(100/4)/2=12.5 takes median S=20；Wherein Sb1It is one
The portable family table number of platform phase-change switch.Phase-change switch installation is as shown in Figure 3 in platform area.
(2) before installing, phase-change switch quantity n, input phase-change switch number, input service time zone should be inputted to phase-change switch
T and timing Tn, the threshold value δ, synchronous phase-change switch clock, setting starting operation time of non-equilibrium among three phase voltages are inputted, according to
The load chart of platform area these last few days is that the influence coefficient gamma of voltage unbalance factor assigns initial value.Under normal circumstances, three-phase electricity
The threshold value δ of pressure degree of unbalancedness, which is set as 0.8% or less, to be advisable, and work time zone T is set as being advisable for 0.5 to 3 minute.With step (1)
Have in the area Zhong Tai and illustrate for 20 phase-change switches, then before installation 20 phase-change switches of reply according to 1#, 2#, 3#20#
It is numbered, the clock time of unified phase-change switch is in synchronous regime, sets the work time zone of phase-change switch as 1 minute, then
The cycle period of 20 phase-change switches is T × n=1 × 20=20 minutes in platform area, successively sets the timing of every phase-change switch
Originate working time T1=00:00:00, T2=00:01:00, T3=00:02:00 ... T20=00:19:00, thus 1# is changed
Mutually switch is in moment T1Working condition is turned on into, enters dormant state in moment 00:00:59,2# phase-change switch is in moment T2It opens
It opens and enters working condition, enter dormant state in moment 00:01:59, and so on, 20# phase-change switch is in moment T20It opens
Into working condition, enter dormant state in moment 00:19:59；1# phase-change switch is turned on into clock time 00:20:00
Working condition, a new cycle period start；The area Ruo Tai phase-change switch time of coming into operation is 00:19:25, then 1# to 19# not work
Make, after 20# phase-change switch reads clock time, judges to reach work time zone, be first begin to enter working condition；As shown in Figure 1.
In the present embodiment, after phase-change switch enters working condition, the acquisition place of registering one's residence includes the phase sequence of three-phase electricity, electricity first
Parameters including pressure, phase angle, bearing power calculate current non-equilibrium among three phase voltages ε, if counting by 3 to 8 samplings
Result ε after calculation has ε > δ, then phase-change switch estimates imbalance of three-phase voltage after commutation according to bearing power, locating period
ε ' is spent, if ε ' < ε, executes corresponding commutation movement；Conversely, then phase-change switch is failure to actuate.By multiple repairing weld and calculating three
Phase voltage degree of unbalancedness can effectively avoid commutation caused by phase-change switch is fluctuated because of low-voltage network short time voltage and act, increases
The validity of commutation；Non-equilibrium among three phase voltages after estimation commutation, make non-equilibrium among three phase voltages after commutation and prejudge,
It avoids non-equilibrium among three phase voltages after commutation from being greater than the value before commutation, generated adjustment.
In the present embodiment, non-equilibrium among three phase voltages ε '=∣ ε-γ × P ∣ after commutation, wherein P is phase-change switch load
Power, γ are the influence coefficient of voltage unbalance factor；Gamma reaction be non-equilibrium among three phase voltages variable quantity and phase-change switch
The approximate ratio relationship of bearing power variable quantity, calculation formula are γ=(ε-ε h)/P, and ε, ε h, P are that commutation is opened in the K period here
10 recent histories of Central Shanxi Plain storage after being weighted and averaged, calculate γ value according to above-mentioned formula, as next time
The basic data that non-equilibrium among three phase voltages ε ' after commutation is estimated before commutation, gathers to obtain new one group of ε, ε h and P when the K period,
Automatic to remove the interior earliest record of corresponding K period set, guaranteeing that K gathers interior 10 groups of records is always newest ε, ε h and P
Value；Phase-change switch re-starts weighted average calculation according to newest 10 groups of data, obtains new γ value, changes as next time
Estimate the basic data of non-equilibrium among three phase voltages ε ' after commutation in phase front.In addition, when using phase-change switch for the first time, it should be according to platform
γ initial value is arranged in the load chart of area's these last few days；After phase-change switch enters working condition, the automatic collection place of registering one's residence includes
Parameters including the voltage of three-phase electricity, phase angle, phase sequence, bearing power, calculate and record current imbalance of three-phase voltage
It spends ε, survey non-equilibrium among three phase voltages ε h, phase-change switch bearing power P after commutation.
The present invention breaks the administering method of conventional three-phase imbalance, and working out several phase-change switches according to time series is one
Group is that every phase-change switch distributes independent work time zone, and the dynamic change of low-voltage network three-phase voltage, phase difference value is right
The movement of every phase-change switch has an impact；The variation of time series and platform area low-voltage network three-phase voltage, phase difference value
Change, the movement of all phase-change switches, is the basis that platform area phase-change switch is able to network consisting in joint effect platform area；Commutation is opened
It closes according to three-phase voltage, phase angle, calculating non-equilibrium among three phase voltages and the degree of unbalancedness threshold value ratio with setting detected
Compared with judging whether to execute commutation movement, adjust three-phase electric load to equilibrium state by progressive mode step by step；The method is not required to specially
Host computer and phase-change switch set up physical connection network, be not required to set up special physical communication network transmission phase-change switch control
Signal and electric network data have simplified product structure so as to avoid communication module and upper computer module is used, saved manufacture at
This.Adverse circumstances and the negative effect of telecommunication bring are avoided, the reliability and Tai Qu of phase-change switch work are improved
Network operation efficiency.
Separate unit phase-change switch failure in low-voltage network of the invention, does not influence network system overall operation, can be only right
The phase-change switch maintenance of failure is generated, the network operation of platform area is substantially unaffected.
After method using the low-voltage network three-phase imbalance in the present invention, platform area can be adjusted according to phase-change switch quantity
Low-voltage network non-equilibrium among three phase voltages, non-equilibrium among three phase voltages are can be controlled within 1%, at present most domestic three-phase
The scheme that imbalance is administered generally can only all be controlled 1% or more, therefore the present invention adjusts the precision of three-phase load unbalance degree
Higher, adjustment effect becomes apparent from, and can obtain preferable regulation effect and economic benefit.
Present invention real time monitoring and adjustment platform area internal loading distribution, response time at 0.5 to 3 minute, are significantly better than existing
The adjustment period of 20 to 30 minutes of technology can adjust the low-voltage network three-phase equilibrium of platform area much sooner, adjust low pressure and match
The real-time of power grid three-phase equilibrium is stronger, reduces line loss effect and becomes apparent from, social benefit is more preferably.
Technical characteristic of the present invention without description can realize that details are not described herein by or using the prior art, certainly,
Above-mentioned specific embodiment is not limitation of the present invention, and the present invention is also not limited to above-mentioned specific embodiment, this skill
The variations, modifications, additions or substitutions that the those of ordinary skill in art field is made within the essential scope of the present invention should also be fallen into
In protection scope of the present invention.
Claims (8)
1. the method for gradual strategy adjustment low-voltage network imbalance of three-phase voltage, which is characterized in that the method is platform area
Interior each phase-change switch sequentially enters in its corresponding work time zone T, and the current three-phase voltage that phase-change switch is detected with itself is not
Degree of balance ε is compared for non-equilibrium among three phase voltages ε ' after reference, with the threshold value δ of preset non-equilibrium among three phase voltages and commutation
Compared with, judge whether execute and how to execute commutation movement；After a work time zone, into subsequent work time zone, and
Timing TnMoment next phase-change switch enters working condition, next phase-change switch according to new low voltage power distribution network three-phase not
Equilibrium condition judges whether that executing commutation acts, and so on, platform area low-voltage network three-phase is gradually adjusted with progressive manner
Voltage unbalance factor tends to the threshold range of setting；Specific step is as follows:
(1) according in platform area phase-change switch quantity n set phase-change switch number 1#, 2#, 3# ... n#, share out the work time zone T and
Timing Tn, set the threshold value δ of non-equilibrium among three phase voltages；
(2) m# phase-change switch detects its lead-in wire terminal three-phase voltage, phase angle, phase sequence and load function within the corresponding time zone T period
Rate, and calculate current non-equilibrium among three phase voltages ε；ε and δ are compared, as ε≤δ, m# phase-change switch is failure to actuate；As ε >
When δ, m# phase-change switch is according to non-equilibrium among three phase voltages ε ' after the parameters estimation commutation including bearing power, by ε '
It is compared with ε, as ε ' >=ε, m# phase-change switch is failure to actuate, and as ε ' < ε, it is dynamic that m# phase-change switch executes corresponding commutation
Make；
(3) enter before the T of subsequent work time zone, m# phase-change switch enters dormant state and waits subsequent cycle period m # switch pair
The arrival for answering timing, when switching time is timing Tm+1When, m+1# phase-change switch enters working condition, and m+1# phase-change switch is in phase
It answers and repeats step (2) and step (3) in the time zone T period；
(4) after a cycle period terminates T × n, into the subsequent cycle period, 1#, 2#, 3# ... n# phase-change switch successively into
Enter corresponding work time zone T, and repeats step (2), step (3) and step (4).
2. the method for gradual strategy adjustment low-voltage network imbalance of three-phase voltage according to claim 1, feature
It is, all phase-change switch clock times keep synchronizing, and all phase-change switches are being opened equipped with clock reserve battery
After shutdown electricity, system reserve battery is voluntarily enabled, and is powered for clock crystal oscillator, guarantees phase-change switch in accidental power-off and repair
Under, clock time keeps operating, and after the completion of restoring electricity or repair again, being not required to reset clock sequence can restore to make
With；Phase-change switch is run after a certain period of time, is carried out time service to clock, is corrected the time difference.
3. the method for gradual strategy adjustment low-voltage network imbalance of three-phase voltage according to claim 1, feature
It is, within the time zone T period, be up to a phase-change switch executes commutation movement, and at most generates commutation movement,
Remaining phase-change switch in a dormant state and waits the arrival of corresponding timing.
4. the method for gradual strategy adjustment low-voltage network imbalance of three-phase voltage according to claim 1, feature
It is, the influence factor of non-equilibrium among three phase voltages ε ' includes P, γ and K after the commutation, and wherein P is that phase-change switch loads function
Rate, γ are the influence coefficient of voltage unbalance factor, are calculated and are generated by historical data, and K is period parameters, be according to clock time and
The period that platform area load curve characteristics divide；Phase-change switch records the non-equilibrium among three phase voltages situation of change before and after commutation, will
Non-equilibrium among three phase voltages variable quantity and period before and after bearing power, commutation form corresponding relationship storage, record nearest X times
Data before and after commutation analyze the influence coefficient gamma of phase-change switch bearing power P and voltage unbalance factor, as phase-change switch
With the reference quantity for executing commutation movement in the period next time.
5. the method for gradual strategy adjustment low-voltage network imbalance of three-phase voltage according to claim 4, feature
It is, uses phase-change switch for the first time, γ initial value should be set according to the load chart of platform area these last few days；Phase-change switch into
After entering working condition, automatic collection is registered one's residence parameters of the place including three-phase voltage, phase angle, phase sequence, bearing power including, is counted
Current non-equilibrium among three phase voltages ε is calculated and recorded, if ε > δ, reads clock time, its locating period K is differentiated, according to P, γ
Non-equilibrium among three phase voltages ε ' after commutation is estimated with the value of K, if ε ' < ε, corresponding commutation movement is executed, after the completion of commutation
Moment, phase-change switch acquire data, calculate new current non-equilibrium among three phase voltages ε, and record storage arrives relevant parameter
In set.
6. the method for gradual strategy adjustment low-voltage network imbalance of three-phase voltage according to claim 1, feature
It is that phase-change switch is that every phase-change switch distributes independent work according to time series establishment number, timing and time zone in platform area
Time zone, the dynamic change of power grid three-phase voltage, phase difference value have an impact the movement of every phase-change switch；Time series
Change the variation with platform area low-voltage network three-phase voltage, phase difference value, the movement of all phase-change switches in joint effect platform area,
It is the basis that platform area phase-change switch is able to network consisting.
7. the method for gradual strategy adjustment low-voltage network imbalance of three-phase voltage according to claim 1, feature
It is, the phase-change switch is mounted on the family electricity box of single-phase load and divides before electronic box, the number n of phase-change switch and family in platform area
The ratio of table sum should be less than 1/3.
8. the method for gradual strategy adjustment low-voltage network imbalance of three-phase voltage according to claim 1, feature
It is, the phase-change switch should be selectively mounted to the family electricity box of single-phase load and divide before electronic box, and installation site is convenient for construction
And sharing of load.
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| CN109787254B (en) * | 2019-02-18 | 2020-07-03 | 石家庄科林电气股份有限公司 | Switching strategy for three-phase load unbalance regulation period |
| CN110103735B (en) * | 2019-05-21 | 2022-06-17 | 兰州理工大学 | Electric automobile optimal charging access point selection method based on MOPSO algorithm |
| CN111061827B (en) * | 2019-12-30 | 2023-04-18 | 广东电网有限责任公司 | Construction method of power distribution network electric energy supply and demand balance thermodynamic diagram |
| CN114915028B (en) * | 2022-06-01 | 2022-12-13 | 安徽上诚电力科技有限公司 | Interlocking remote control system based on low-voltage power distribution cabinet |
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