CN109713692A - A kind of phase change method of multi-point combination mode - Google Patents
A kind of phase change method of multi-point combination mode Download PDFInfo
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Abstract
The invention discloses a kind of phase change method of multi-point combination mode, the A phase current I including distribution transformer terminals picking platform area transformer output endA, B phase current IBAnd C phase current IC, and according to IA、IBAnd ICCalculate the average value I of three-phase currentavgAnd the degree of unbalancedness θ of three-phase currentI, work as θIGreater than the degree of unbalancedness threshold θ of preset three-phase currentthWhen, according to IA、IBAnd ICDetermine Imax、IminAnd middle Imid, and calculate ImaxWith ImidDifference α1And ImidWith IminDifference α2, according to α1Calculating difference rate λ1, according to α2Calculating difference rate λ2；According to λ1With λ2, commutation decision is carried out, distribution transformer terminals are according to the I after commutation decisionA’、IB' and IC' calculate Iavg' and θI', work as θI' it is less than or equal to θthWhen, export commutation decision.This method can filter out suitable commutation combination, accurately and effectively reduce platform area tri-phase unbalance factor, and commutation number is less, reduce the loss of phase-change switch equipment according to the load condition of user.
Description
Technical field
The invention belongs to low-voltage distribution commutation design field more particularly to a kind of phase change methods of multi-point combination mode.
Background technique
The basis of low-voltage network three-phase equilibrium is that the load that three-phase is connect is equal, i.e., load is equably switched to three-phase
On, and in resident's wiring, staff it is not corresponding to separate access according to and measure, and in low-voltage network
The quantity for accessing single-phase resident load is especially more, causes the three-phase imbalance situation of low-voltage platform area more serious.In low-voltage distribution
When net tri-phase unbalance factor is higher, distribution transformer loss and grid loss will be greatly increased, and be unfavorable for the peace of electrical equipment
Row for the national games, thus it is guaranteed that the three-phase equilibrium of low-voltage network is to improve the effective means of economic power system, it is electric power netting safe running
Premise, be the guarantee of custom power quality reliability.
Existing three-phase imbalance processing method mainly includes three kinds: power electronics type, capacitive and phase-change switch type.Preceding two
Kind of method is all that injection rate compensation is carried out according to existing three-phase imbalance state, three-phase load be still it is unbalanced, therefore
Both methods can not fundamentally solve the problems, such as three-phase imbalance.The main phase by being accessed load of phase-change switch type
Position is converted, so that the load of access three-phase substantially achieves equilibrium state, also has certain applications in practice, for administering
The three-phase imbalance of low-voltage platform area.
The key of phase-change switch type three-phase imbalance processing method is the generation of commutation decision, some are used directly will be heavily loaded
The method that phase load is transferred to underloading phase, does not consider from the platform area overall situation, is unable to reach maximum three-phase equilibrium；Some
Using all phase-change switch commutation combination enumerative techniques in platform area, considers all possible separate combination, best phase is determined with this
Bit combination, but it is more due to connecing phase-change switch quantity under platform area, and this kind of method calculation amount is larger, is not suitable for practical application.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of phase change method of multi-point combination mode, this method being capable of basis
The load condition of user filters out suitable commutation combination, accurately and effectively reduces platform area tri-phase unbalance factor, and commutation time
Number is less, reduces the loss of phase-change switch equipment.
To solve the above problems, the technical solution of the present invention is as follows:
A kind of phase change method of multi-point combination mode, includes the following steps:
S1: the A phase current I of distribution transformer terminals picking platform area transformer output endA, B phase current IBAnd C phase current IC, and root
According to IA、IBAnd ICCalculate the average value I of three-phase currentavgAnd the degree of unbalancedness of three-phase current
S2: judge θIWhether the degree of unbalancedness threshold θ of preset three-phase current is greater thanth, if so, S3 is then entered step, into
Row commutation decision calculates, if not, returning to the step S1；
S3: according to IA、IBAnd ICDetermine maximum phase current Imax, minimum phase current IminAnd intermediate phase current Imid, and
Calculate ImaxWith ImidDifference α1And ImidWith IminDifference α2, according to α1Calculating difference rate λ1, according to α2Calculating difference ratio
Rate λ2,λ1+λ2=1；
S4: such as λ1Greater than 0.6, then IA、IBAnd ICIn a phase current be higher than Iavg, biphase current is lower than Iavg, enter step
S5；
S4 ': such as λ2Greater than 0.6, then IA、IBAnd ICIn a phase current be lower than IavgBiphase current is higher than Iavg, enter step
S6；
S4 ": such as λ1Less than or equal to 0.6 or λ2Less than or equal to 0.6, then IA、IBAnd ICIn a phase current be higher than
Iavg, a phase current be lower than IavgAnd one phase current be equal to Iavg, enter step S7；
S5: by ImaxPortion of electrical current in corresponding phase sequence is transferred to ImidCorresponding phase sequence and IminIn corresponding phase sequence, and
Enter step S8；
S6: by ImaxPortion of electrical current and I in corresponding phase sequencemidPortion of electrical current in corresponding phase sequence is transferred to IminIt is right
In the phase sequence answered, and enter the step S8；
S7: by ImaxPortion of electrical current in corresponding phase sequence is transferred to IminIn corresponding phase sequence；
S8: the distribution transformer terminals are according to the A phase current I after the commutation decisionA', B phase current IB' and C phase current IC’
Calculate the average value I of three-phase currentavg' and three-phase current degree of unbalancedness θI'；
S9: judge θI' whether it is less than or equal to θth, if so, commutation decision is then exported, if not, returning to the step S3；
Wherein, | IA-Iavg| expression takes absolute value, max | IA-Iavg|,|IB-Iavg|,|IC-Iavg| indicate | IA-Iavg
|、|IB-Iavg| and | IC-Iavg| interior maximum value.
The phase change method for the multi-point combination mode that one embodiment of the invention provides, the step S5 detailed process are as follows:
S501: by IA、IBAnd ICAccording to Imax、IminAnd ImidSequence arrangement, determine ImaxCorresponding phase sequence, IminIt is right
The phase sequence and I answeredmidCorresponding phase sequence calculates IavgWith ImidBetween difference β1, IavgWith IminBetween difference β2；
S502: in ImaxThe corresponding all area users of phase sequence in find out closest to β1Electric current L1；
S503: judgement | L1-β1| whether less than 0.1 × Iavg, if so, then by L1From ImaxI is transferred in corresponding phase sequencemid
Corresponding phase sequence, if not, being less than β1Electric current in select closest to β1Electric current L2, while finding electric current L3, make | L2+L3-
β1| 0.1 × I of <avg, and by L2With L3From ImaxI is transferred in corresponding phase sequencemidCorresponding phase sequence；
S502 ': in ImaxThe corresponding all area users of phase sequence in find out closest to β2Electric current L4；
S503 ': judgement | L4-β2| whether less than 0.1 × Iavg, if so, then by L4From ImaxIt is transferred in corresponding phase sequence
IminCorresponding phase sequence, if not, being less than β2Electric current in select closest to β2Electric current L5, while finding electric current L6, make | L5+
L6-β2| 0.1 × I of <avg, and by L5With L6From ImaxI is transferred in corresponding phase sequenceminCorresponding phase sequence.
The phase change method for the multi-point combination mode that one embodiment of the invention provides, the step S6 detailed process are as follows:
S601: by IA、IBAnd ICAccording to Imax、IminAnd ImidSequence arrangement, determine ImaxCorresponding phase sequence, IminIt is right
The phase sequence and I answeredmidCorresponding phase sequence calculates ImaxWith IavgBetween difference β3, ImidWith IavgBetween difference β4；
S602: in ImaxThe corresponding all area users of phase sequence in find out closest to β3Electric current L7；
S603: judgement | L7-β3| whether less than 0.1 × Iavg, if so, then by L7From ImaxI is transferred in corresponding phase sequencemin
Corresponding phase sequence, if not, being less than β3Electric current in select closest to β3Electric current L8, while finding electric current L9, make | L8+L9-
β3| 0.1 × I of <avg, and by L8With L9From ImaxI is transferred in corresponding phase sequenceminCorresponding phase sequence；
S602 ': in ImidThe corresponding all area users of phase sequence in find out closest to β4Electric current L10；
S603 ': judgement | L10-β4| whether less than 0.1 × Iavg, if so, then by L10From ImidIt is transferred in corresponding phase sequence
IminCorresponding phase sequence, if not, being less than β4Electric current in select closest to β4Electric current L11, while finding electric current L12, make |
L11+L12-β4| 0.1 × I of <avg, and by L11With L12From ImidI is transferred in corresponding phase sequenceminCorresponding phase sequence.
The phase change method for the multi-point combination mode that one embodiment of the invention provides, the step S7 detailed process are as follows:
S701: by IA、IBAnd ICAccording to Imax、IminAnd ImidSequence arrangement, determine ImaxCorresponding phase sequence, and
IminCorresponding phase sequence calculates ImaxWith IavgBetween difference β5；
S702: in ImaxThe corresponding all area users of phase sequence in find out closest to β5Electric current L13；
S703: judgement | L13-β5| whether less than 0.1 × Iavg, if so, then by L13From ImaxIt is transferred in corresponding phase sequence
IminCorresponding phase sequence, if not, being less than β5Electric current in select closest to β5Electric current L14, while finding electric current L15, make |
L13+L14-β5| 0.1 × I of <avg, and by L13With L14From ImaxI is transferred in corresponding phase sequenceminCorresponding phase sequence.
The present invention due to using the technology described above, makes it have the following advantages that and actively imitate compared with prior art
Fruit:
Distribution transformer terminals picking platform area transformation in the phase change method for the multi-point combination mode that one embodiment of the invention provides
The A phase current I of device output endA, B phase current IBAnd C phase current IC, and according to IA、IBAnd ICCalculate being averaged for three-phase current
Value IavgAnd the degree of unbalancedness θ of three-phase currentI, work as θIGreater than the degree of unbalancedness threshold θ of preset three-phase currentthWhen, according to IA、
IBAnd ICDetermine maximum phase current Imax, minimum phase current IminAnd intermediate phase current Imid, and calculate ImaxWith ImidDifference
α1And ImidWith IminDifference α2, according to α1Calculating difference rate λ1, according to α2Calculating difference rate λ2；Work as λ1Greater than 0.6,
Indicate IA、IBAnd ICIn a phase current be higher than Iavg, biphase current is lower than Iavg, by ImaxElectric current in corresponding phase sequence is transferred to
ImidCorresponding phase sequence and IminIn corresponding phase sequence；Work as λ2Greater than 0.6, I is indicatedA、IBAnd ICIn a phase current be lower than IavgTwo
Phase current is higher than Iavg, by ImaxElectric current and I in corresponding phase sequencemidElectric current in corresponding phase sequence is transferred to IminCorresponding phase
In sequence；Work as λ1Less than or equal to 0.6 or λ2When less than or equal to 0.6, indicate that phase current is higher than Iavg, a phase current be lower than Iavg
And one phase current be equal to Iavg, by ImaxElectric current in corresponding phase sequence is transferred to IminIn corresponding phase sequence；Distribution transformer terminals according to
A phase current I after commutation decisionA', B phase current IB' and C phase current IC' calculate three-phase current average value Iavg' and three
The degree of unbalancedness θ of phase currentI', work as θI' it is less than or equal to θthWhen, export commutation decision.This method can be according to the load of user
State filters out suitable commutation combination, accurately and effectively reduces platform area tri-phase unbalance factor, and commutation number is less, subtracts
The loss of few phase-change switch equipment.
Detailed description of the invention
Fig. 1 is the system flow chart of the phase change method of the multi-point combination mode of one embodiment of the invention；
Fig. 2 is the flow chart of step 5 detailed process of one embodiment of the invention；
Fig. 3 is the flow chart of step 6 detailed process of one embodiment of the invention；
Fig. 4 is the flow chart of step 7 detailed process of one embodiment of the invention；
Fig. 5 is the commutation structural schematic diagram of one embodiment of the invention.
Description of symbols:
1: distribution transformer terminals.
Specific embodiment
Below in conjunction with the drawings and specific embodiments to a kind of phase change method of multi-point combination mode proposed by the present invention make into
One step is described in detail.According to following explanation and claims, advantages and features of the invention will be become apparent from.
Referring to Fig. 1, a kind of phase change method of multi-point combination mode includes the following steps:
S1: the A phase current I of 1 picking platform area transformer output end of distribution transformer terminalsA, B phase current IBAnd C phase current IC, and
According to IA、IBAnd ICCalculate the average value I of three-phase currentavgAnd the degree of unbalancedness of three-phase current
S2: judge θIWhether the degree of unbalancedness threshold θ of preset three-phase current is greater thanth, if so, S3 is then entered step, into
Row commutation decision calculates, if not, return step S1；
S3: according to IA、IBAnd ICDetermine maximum phase current Imax, minimum phase current IminAnd intermediate phase current Imid, and
Calculate ImaxWith ImidDifference α1And ImidWith IminDifference α2, according to α1Calculating difference rate λ1, according to α2Calculating difference ratio
Rate λ2,λ1+λ2=1；
S4: such as λ1Greater than 0.6, then IA、IBAnd ICIn a phase current be higher than Iavg, biphase current is lower than Iavg, enter step
S5；
S4 ': such as λ2Greater than 0.6, then IA、IBAnd ICIn a phase current be lower than IavgBiphase current is higher than Iavg, enter step
S6；
S4 ": such as λ1Less than or equal to 0.6 or λ2Less than or equal to 0.6, then IA、IBAnd ICIn a phase current be higher than
Iavg, a phase current be lower than IavgAnd one phase current be equal to Iavg, enter step S7；
S5: by ImaxPortion of electrical current in corresponding phase sequence is transferred to ImidCorresponding phase sequence and IminIn corresponding phase sequence, and
Enter step S8；
S6: by ImaxPortion of electrical current and I in corresponding phase sequencemidPortion of electrical current in corresponding phase sequence is transferred to IminIt is right
In the phase sequence answered, and enter step S8；
S7: by ImaxPortion of electrical current in corresponding phase sequence is transferred to IminIn corresponding phase sequence；
S8: distribution transformer terminals 1 are according to the A phase current I after commutation decisionA', B phase current IB' and C phase current IC' calculate three
The average value I of phase currentavg' and three-phase current degree of unbalancedness θI'；
S9: judge θI' whether it is less than or equal to θth, if so, commutation decision is then exported, if not, return step S3；
Wherein, | IA-Iavg| expression takes absolute value, max | IA-Iavg|,|IB-Iavg|,|IC-Iavg| indicate | IA-Iavg
|、|IB-Iavg| and | IC-Iavg| interior maximum value.
It is appreciated that the 1 picking platform area of distribution transformer terminals in the phase change method of multi-point combination mode provided in this embodiment becomes
The A phase current I of depressor output endA, B phase current IBAnd C phase current IC, and according to IA、IBAnd ICCalculate the flat of three-phase current
Mean value IavgAnd the degree of unbalancedness θ of three-phase currentI, work as θIGreater than the degree of unbalancedness threshold θ of preset three-phase currentthWhen, according to
IA、IBAnd ICDetermine maximum phase current Imax, minimum phase current IminAnd intermediate phase current Imid, and calculate ImaxWith ImidDifference
Value α1And ImidWith IminDifference α2, according to α1Calculating difference rate λ1, according to α2Calculating difference rate λ2；Work as λ1It is greater than
0.6, indicate IA、IBAnd ICIn a phase current be higher than Iavg, biphase current is lower than Iavg, by ImaxElectric current in corresponding phase sequence turns
Move to ImidCorresponding phase sequence and IminIn corresponding phase sequence；Work as λ2Greater than 0.6, I is indicatedA、IBAnd ICIn a phase current be lower than
IavgBiphase current is higher than Iavg, by ImaxElectric current and I in corresponding phase sequencemidElectric current in corresponding phase sequence is transferred to IminIt is right
In the phase sequence answered；Work as λ1Less than or equal to 0.6 or λ2When less than or equal to 0.6, indicate that phase current is higher than Iavg, a phase current
Lower than IavgAnd one phase current be equal to Iavg, by ImaxElectric current in corresponding phase sequence is transferred to IminIn corresponding phase sequence；Distribution transforming
Terminal 1 is according to the A phase current I after commutation decisionA', B phase current IB' and C phase current IC' calculate three-phase current average value
Iavg' and three-phase current degree of unbalancedness θI', work as θI' it is less than or equal to θthWhen, export commutation decision.This method being capable of basis
The load condition of user filters out suitable commutation combination, accurately and effectively reduces platform area tri-phase unbalance factor, and commutation time
Number is less, reduces the loss of phase-change switch equipment.
Further, step S5 detailed process are as follows:
S501: by IA、IBAnd ICAccording to Imax、IminAnd ImidSequence arrangement, determine ImaxCorresponding phase sequence, IminIt is right
The phase sequence and I answeredmidCorresponding phase sequence calculates IavgWith ImidBetween difference β1, IavgWith IminBetween difference β2；
S502: in ImaxThe corresponding all area users of phase sequence in find out closest to β1Electric current L1；
S503: judgement | L1-β1| whether less than 0.1 × Iavg, if so, then by L1From ImaxI is transferred in corresponding phase sequencemid
Corresponding phase sequence, if not, being less than β1Electric current in select closest to β1Electric current L2, while finding electric current L3, make | L2+L3-
β1| 0.1 × I of <avg, and by L2With L3From ImaxI is transferred in corresponding phase sequencemidCorresponding phase sequence；
S502 ': in ImaxThe corresponding all area users of phase sequence in find out closest to β2Electric current L4；
S503 ': judgement | L4-β2| whether less than 0.1 × Iavg, if so, then by L4From ImaxIt is transferred in corresponding phase sequence
IminCorresponding phase sequence, if not, being less than β2Electric current in select closest to β2Electric current L5, while finding electric current L6, make | L5+
L6-β2| 0.1 × I of <avg, and by L5With L6From ImaxI is transferred in corresponding phase sequenceminCorresponding phase sequence.
Further, step S6 detailed process are as follows:
S601: by IA、IBAnd ICAccording to Imax、IminAnd ImidSequence arrangement, determine ImaxCorresponding phase sequence, IminIt is right
The phase sequence and I answeredmidCorresponding phase sequence calculates ImaxWith IavgBetween difference β3, ImidWith IavgBetween difference β4；
S602: in ImaxThe corresponding all area users of phase sequence in find out closest to β3Electric current L7；
S603: judgement | L7-β3| whether less than 0.1 × Iavg, if so, then by L7From ImaxI is transferred in corresponding phase sequencemin
Corresponding phase sequence, if not, being less than β3Electric current in select closest to β3Electric current L8, while finding electric current L9, make | L8+L9-
β3| 0.1 × I of <avg, and by L8With L9From ImaxI is transferred in corresponding phase sequenceminCorresponding phase sequence；
S602 ': in ImidThe corresponding all area users of phase sequence in find out closest to β4Electric current L10；
S603 ': judgement | L10-β4| whether less than 0.1 × Iavg, if so, then by L10From ImidIt is transferred in corresponding phase sequence
IminCorresponding phase sequence, if not, being less than β4Electric current in select closest to β4Electric current L11, while finding electric current L12, make |
L11+L12-β4| 0.1 × I of <avg, and by L11With L12From ImidI is transferred in corresponding phase sequenceminCorresponding phase sequence.
Further, step S7 detailed process are as follows:
S701: by IA、IBAnd ICAccording to Imax、IminAnd ImidSequence arrangement, determine ImaxCorresponding phase sequence, and
IminCorresponding phase sequence calculates ImaxWith IavgBetween difference β5；
S702: in ImaxThe corresponding all area users of phase sequence in find out closest to β5Electric current L13；
S703: judgement | L13-β5| whether less than 0.1 × Iavg, if so, then by L13From ImaxIt is transferred in corresponding phase sequence
IminCorresponding phase sequence, if not, being less than β5Electric current in select closest to β5Electric current L14, while finding electric current L15, make |
L13+L14-β5| 0.1 × I of <avg, and by L13With L14From ImaxI is transferred in corresponding phase sequenceminCorresponding phase sequence.
Specific commutation process are as follows:
Assuming that order phase user has 12 under certain area,
Table 1 is that order phase user accesses separate and corresponding separate load current data table (current unit: A) under certain area
| User | User 1 | User 2 | User 3 | User 4 | User 5 | User 6 |
| It accesses separate | C | A | A | B | C | B |
| Load current/A | 2.56 | 1.08 | 4.68 | 7.34 | 4.46 | 3.92 |
| User | User 7 | User 8 | User 9 | User 10 | User 11 | User 12 |
| It accesses separate | A | A | B | C | C | B |
| Load current A | 1.26 | 3.38 | 3.54 | 1.57 | 2.55 | 6.24 |
The A phase current I of 1 picking platform area transformer output end of distribution transformer terminalsA, B phase current IBAnd C phase current IC:
IA=1.08+4.68+1.26+3.38=10.4A；
IB=7.34+3.92+3.54+6.24=21.04A；
IC=2.56+4.46+1.57+2.55=11.14A；
And according to IA、IBAnd ICCalculate the average value I of three-phase currentavgAnd the degree of unbalancedness θ of three-phase currentI；
If the tri-phase unbalance factor threshold θ of settingthIt is 10%, then θI> θth, the calculating of commutation decision is carried out, according to IA、IB
And ICDetermine maximum phase current Imax, Imax=21.04A=IB, minimum phase current Imin, Imin=10.4A=IA, and it is intermediate
Phase current Imid, Imid=11.14A=IC, and calculate ImaxWith ImidDifference α1And ImidWith IminDifference α2, according to α1Meter
Calculate difference rate λ1, according to α2Calculating difference rate λ2,
α1=Imax-Imid=21.04-11.14=9.9A；
α2=Imid-Imin=11.14-10.4=0.74A；
Wherein, λ1> 0.6, IA、IBAnd ICMiddle B phase current is higher than Iavg, A phase and C phase current are lower than Iavg, then by B phase
Electric current is transferred to A phase with C phase, calculates IavgWith ImidBetween difference β1, IavgWith IminBetween difference β2,
β1=Iavg-Imin=14.19-11.14=3.05A；
β2=Iavg-Imin=14.19-10.4=3.79A；
It finds out in all area users of B phase closest to β1Electric current L1, i.e. user 9, L1=3.54A, | L1-β1|=|
3.54-3.05 0.1 × I of |=0.49A <avg=1.419, then directly by the electric current in user 9 from B phase transfer to C phase；
Continuation is found out in all area users of B phase closest to β2Electric current L4, i.e. user 6, L4=3.92A, | L4-β2|=
| 3.92-3.79 | 0.1 × I of=0.13A <avg=1.419, then directly by the electric current in user 6 from B phase transfer to A phase, complete
Load accesses separate adjustment.
Three-phase current adjusted are as follows: IA'=14.32A, IB'=13.58A and IC'=14.68A, three-phase adjusted
Degree of unbalancedness θI'=4.3%, θI' < θth, meet adjustment requirement.
Embodiments of the present invention are explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementations
Mode.Even if to the present invention, various changes can be made, if these variations belong to the model of the claims in the present invention and its equivalent technologies
Within enclosing, then still fall within the protection scope of the present invention.
Claims (4)
1. a kind of phase change method of multi-point combination mode, which comprises the steps of:
S1: the A phase current I of distribution transformer terminals picking platform area transformer output endA, B phase current IBAnd C phase current IC, and according to IA、
IBAnd ICCalculate the average value I of three-phase currentavgAnd the degree of unbalancedness θ of three-phase currentI,
S2: judge θIWhether the degree of unbalancedness threshold θ of preset three-phase current is greater thanth, if so, then entering step S3, changed
Phase decision calculates, if not, returning to the step S1；
S3: according to IA、IBAnd ICDetermine maximum phase current Imax, minimum phase current IminAnd intermediate phase current Imid, and calculate
ImaxWith ImidDifference α1And ImidWith IminDifference α2, according to α1Calculating difference rate λ1, according to α2Calculating difference ratio
λ2,λ1+λ2=1；
S4: such as λ1Greater than 0.6, then IA、IBAnd ICIn a phase current be higher than Iavg, biphase current is lower than Iavg, enter step S5；
S4 ': such as λ2Greater than 0.6, then IA、IBAnd ICIn a phase current be lower than IavgBiphase current is higher than Iavg, enter step S6；
S4 ": such as λ1Less than or equal to 0.6 or λ2Less than or equal to 0.6, then IA、IBAnd ICIn a phase current be higher than Iavg, one
Phase current is lower than IavgAnd one phase current be equal to Iavg, enter step S7；
S5: by ImaxPortion of electrical current in corresponding phase sequence is transferred to ImidCorresponding phase sequence and IminIn corresponding phase sequence, and enter
Step S8；
S6: by ImaxPortion of electrical current and I in corresponding phase sequencemidPortion of electrical current in corresponding phase sequence is transferred to IminIt is corresponding
In phase sequence, and enter the step S8；
S7: by ImaxPortion of electrical current in corresponding phase sequence is transferred to IminIn corresponding phase sequence；
S8: the distribution transformer terminals are according to the A phase current I after the commutation decisionA', B phase current IB' and C phase current IC' calculate
The average value I of three-phase currentavg' and three-phase current degree of unbalancedness θI'；
S9: judge θI' whether it is less than or equal to θth, if so, commutation decision is then exported, if not, returning to the step S3；
Wherein, | IA-Iavg| expression takes absolute value, max | IA-Iavg|,|IB-Iavg|,|IC-Iavg| indicate | IA-Iavg|、|
IB-Iavg| and | IC-Iavg| interior maximum value.
2. the phase change method of multi-point combination mode as described in claim 1, which is characterized in that the step S5 detailed process
Are as follows:
S501: by IA、IBAnd ICAccording to Imax、IminAnd ImidSequence arrangement, determine ImaxCorresponding phase sequence, IminIt is corresponding
Phase sequence and ImidCorresponding phase sequence calculates IavgWith ImidBetween difference β1, IavgWith IminBetween difference β2；
S502: in ImaxThe corresponding all area users of phase sequence in find out closest to β1Electric current L1；
S503: judgement | L1-β1| whether less than 0.1 × Iavg, if so, then by L1From ImaxI is transferred in corresponding phase sequencemidIt is corresponding
Phase sequence, if not, be less than β1Electric current in select closest to β1Electric current L2, while finding electric current L3, make | L2+L3-β1|
0.1 × I of <avg, and by L2With L3From ImaxI is transferred in corresponding phase sequencemidCorresponding phase sequence；
S502 ': in ImaxThe corresponding all area users of phase sequence in find out closest to β2Electric current L4；
S503 ': judgement | L4-β2| whether less than 0.1 × Iavg, if so, then by L4From ImaxI is transferred in corresponding phase sequenceminIt is right
The phase sequence answered, if not, being less than β2Electric current in select closest to β2Electric current L5, while finding electric current L6, make | L5+L6-β2
| 0.1 × I of <avg, and by L5With L6From ImaxI is transferred in corresponding phase sequenceminCorresponding phase sequence.
3. the phase change method of multi-point combination mode as described in claim 1, which is characterized in that the step S6 detailed process
Are as follows:
S601: by IA、IBAnd ICAccording to Imax、IminAnd ImidSequence arrangement, determine ImaxCorresponding phase sequence, IminIt is corresponding
Phase sequence and ImidCorresponding phase sequence calculates ImaxWith IavgBetween difference β3, ImidWith IavgBetween difference β4；
S602: in ImaxThe corresponding all area users of phase sequence in find out closest to β3Electric current L7；
S603: judgement | L7-β3| whether less than 0.1 × Iavg, if so, then by L7From ImaxI is transferred in corresponding phase sequenceminIt is corresponding
Phase sequence, if not, be less than β3Electric current in select closest to β3Electric current L8, while finding electric current L9, make | L8+L9-β3|
0.1 × I of <avg, and by L8With L9From ImaxI is transferred in corresponding phase sequenceminCorresponding phase sequence；
S602 ': in ImidThe corresponding all area users of phase sequence in find out closest to β4Electric current L10；
S603 ': judgement | L10-β4| whether less than 0.1 × Iavg, if so, then by L10From ImidI is transferred in corresponding phase sequenceminIt is right
The phase sequence answered, if not, being less than β4Electric current in select closest to β4Electric current L11, while finding electric current L12, make | L11+
L12-β4| 0.1 × I of <avg, and by L11With L12From ImidI is transferred in corresponding phase sequenceminCorresponding phase sequence.
4. the phase change method of multi-point combination mode as described in claim 1, which is characterized in that the step S7 detailed process
Are as follows:
S701: by IA、IBAnd ICAccording to Imax、IminAnd ImidSequence arrangement, determine ImaxCorresponding phase sequence and IminIt is right
The phase sequence answered calculates ImaxWith IavgBetween difference β5；
S702: in ImaxThe corresponding all area users of phase sequence in find out closest to β5Electric current L13；
S703: judgement | L13-β5| whether less than 0.1 × Iavg, if so, then by L13From ImaxI is transferred in corresponding phase sequenceminIt is right
The phase sequence answered, if not, being less than β5Electric current in select closest to β5Electric current L14, while finding electric current L15, make | L13+
L14-β5| 0.1 × I of <avg, and by L13With L14From ImaxI is transferred in corresponding phase sequenceminCorresponding phase sequence.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105226684A (en) * | 2015-09-29 | 2016-01-06 | 国电南瑞科技股份有限公司 | A kind of low voltage electric network three-phase imbalance control method based on phase-change switch |
| CN105846453A (en) * | 2016-05-10 | 2016-08-10 | 北京泰豪电力科技有限公司 | Method for treating three-phase load imbalance of low-voltage distribution network |
| RU2628752C1 (en) * | 2016-10-03 | 2017-08-22 | Олег Фёдорович Меньших | Electronically controlled power transformer (ecpt) for electric transmission line to consumer with variable load |
| CN107196323A (en) * | 2016-03-15 | 2017-09-22 | 中电普瑞科技有限公司 | A kind of three-phase imbalance method of controlling switch of multiple-objection optimization |
| CN107834578A (en) * | 2017-11-28 | 2018-03-23 | 国网山东省电力公司电力科学研究院 | A kind of automatic commutation system and method for low pressure phase-change switch |
| CN108347061A (en) * | 2018-04-28 | 2018-07-31 | 淄博康润电气有限公司 | Intelligent positioning commutation point device and method in three-phase imbalance improvement |
| CN108471127A (en) * | 2018-05-05 | 2018-08-31 | 石家庄科林电气股份有限公司 | A kind of three-phase load unbalance Automatic adjustment method realized using simulation transition algorithm |
| CN108471128A (en) * | 2018-05-05 | 2018-08-31 | 石家庄科林电气股份有限公司 | A kind of three-phase load unbalance Automatic adjustment method realized using balanced optimizing algorithm |
| CN108776869A (en) * | 2018-06-07 | 2018-11-09 | 国网河南省电力公司电力科学研究院 | Taiwan area Three-Phase Transformer imbalance administering method based on intelligent electric meter big data analysis |
-
2019
- 2019-01-22 CN CN201910058512.6A patent/CN109713692B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105226684A (en) * | 2015-09-29 | 2016-01-06 | 国电南瑞科技股份有限公司 | A kind of low voltage electric network three-phase imbalance control method based on phase-change switch |
| CN107196323A (en) * | 2016-03-15 | 2017-09-22 | 中电普瑞科技有限公司 | A kind of three-phase imbalance method of controlling switch of multiple-objection optimization |
| CN105846453A (en) * | 2016-05-10 | 2016-08-10 | 北京泰豪电力科技有限公司 | Method for treating three-phase load imbalance of low-voltage distribution network |
| RU2628752C1 (en) * | 2016-10-03 | 2017-08-22 | Олег Фёдорович Меньших | Electronically controlled power transformer (ecpt) for electric transmission line to consumer with variable load |
| CN107834578A (en) * | 2017-11-28 | 2018-03-23 | 国网山东省电力公司电力科学研究院 | A kind of automatic commutation system and method for low pressure phase-change switch |
| CN108347061A (en) * | 2018-04-28 | 2018-07-31 | 淄博康润电气有限公司 | Intelligent positioning commutation point device and method in three-phase imbalance improvement |
| CN108471127A (en) * | 2018-05-05 | 2018-08-31 | 石家庄科林电气股份有限公司 | A kind of three-phase load unbalance Automatic adjustment method realized using simulation transition algorithm |
| CN108471128A (en) * | 2018-05-05 | 2018-08-31 | 石家庄科林电气股份有限公司 | A kind of three-phase load unbalance Automatic adjustment method realized using balanced optimizing algorithm |
| CN108776869A (en) * | 2018-06-07 | 2018-11-09 | 国网河南省电力公司电力科学研究院 | Taiwan area Three-Phase Transformer imbalance administering method based on intelligent electric meter big data analysis |
Non-Patent Citations (5)
| Title |
|---|
| AKIHISA MATSUSHITA 等: "Experimental Verification of Current-Source Inverter With ZVS Commutation Circuit", 《IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS》 * |
| ALEXANDRE CAMPOS 等: "Analysis and design of a series voltage unbalance compensator based on a three-phase VSI operating with unbalanced switching functions", 《PESC "92 RECORD. 23RD ANNUAL IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE》 * |
| 冯平辉 等: "农村配电台区换相开关三相不平衡治理系统的应用", 《上海电力学院学报》 * |
| 张志华 等: "低压三相负荷不平衡治理控制策略研究", 《电力系统及其自动化》 * |
| 陈静 等: "多端直流换相失败对送端影响的PSASP实例仿真", 《华东电力》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110649637A (en) * | 2019-08-09 | 2020-01-03 | 南京因泰莱电器股份有限公司 | Three-phase load unbalance treatment commutation algorithm based on commutation switch |
| CN110649637B (en) * | 2019-08-09 | 2023-05-23 | 南京因泰莱电器股份有限公司 | Three-phase load unbalance treatment phase-change method based on phase-change switch |
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