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CN112886616A - Normalization method based on multi-target three-phase unbalance adjustment - Google Patents

Normalization method based on multi-target three-phase unbalance adjustment Download PDF

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CN112886616A
CN112886616A CN202011595577.3A CN202011595577A CN112886616A CN 112886616 A CN112886616 A CN 112886616A CN 202011595577 A CN202011595577 A CN 202011595577A CN 112886616 A CN112886616 A CN 112886616A
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value
switch
switches
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CN112886616B (en
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陈君
胡浩博
于毅
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Wuhan Zhongyuan Electronic Information Co ltd
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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
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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 invention relates to the technical field of low-voltage power distribution networks, in particular to a multi-target three-phase unbalance adjustment-based normalization method, which comprises the following steps of S1, acquiring a phase current balance ideal value according to three-phase unbalance; s2, acquiring a total load current sequence of the phase change switches on the selected phase and a plurality of phase change switch combinations; s3, calculating the action evaluation value of the combined switch; s4, calculating
Figure DDA0002867926120000011
The sum of the current of each switch load is calculated, and the sum of the current of all the combined switches is a current value SerTotal which can be compensated; s5, calculating the total evaluation value of each combination; s6, in the optimal combination, recalculating serEvaluateActionNums and SerTotalDeta, and normalizing to obtain the minimum combined SAok. The invention takes the minimum unbalance degree of three phases after single adjustment and the minimum evaluation value of the action times of the commutation switch control sequence in single adjustment as the control target, has short calculation time and can obtain the optimal solution, wherein the evaluation value of the sequence action times is the pairThe total times of all the switch actions in the sequence and the times of single switch action are a comprehensive evaluation index, and the algorithm is more intelligent.

Description

Normalization method based on multi-target three-phase unbalance adjustment
Technical Field
The invention relates to the technical field of low-voltage power distribution networks, in particular to a normalization method based on multi-target three-phase unbalance adjustment.
Background
The unbalanced three-phase problem of low-voltage distribution network system is more and more outstanding, causes the unbalanced reason of three-phase to have: the design of the platform area is not guided reasonably, and the construction personnel for installing the meter and connecting the wires also lack the related knowledge and the operation specification of three-phase load balance, so the connection is blind and random; the power load of the user is constantly changed; management of distribution transformer loads is incomplete; the line influence, because single-phase service line circuit overlength especially can lead to low-voltage wire broken string, transformer to lack looks operation etc. to a certain extent under the condition that the maintenance and management is improper or receive external force to destroy, makes distribution transformer operation in unbalanced state.
At present, the harm of unbalanced three-phase load of a low-voltage load side line is as follows: causing unbalance of three-phase voltage; the efficiency of the distribution transformer is reduced; the operating temperature of the distribution transformer is increased, and the service life is shortened; the neutral point is displaced to cause the three-phase voltage of the distribution transformer to be asymmetric, and therefore a normalization method based on multi-target three-phase imbalance adjustment is provided.
Disclosure of Invention
The invention aims to provide a normalization method based on multi-target three-phase unbalance adjustment, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the normalization method based on the multi-target three-phase unbalance adjustment comprises the following steps:
s1, respectively obtaining phase currents of three phases at the outgoing line side of the distribution transformer, calculating the unbalance degree of the three phases according to the phase currents of the three phases, and obtaining a phase current balance ideal value according to the unbalance degree of the three phases;
s2, selecting phase current of any phase, comparing the selected phase current with the phase current balance ideal value, when the selected phase current is larger than the phase current balance ideal value, calculating a compensation current value between the selected phase current and the phase current balance optimized value, and acquiring a total load current sequence of the phase change switches and a plurality of phase change switch combinations on the selected phase;
s3, the influence evaluation value P1 of the single switch action times is as follows: (k 1/fcnmtdotactnums) k1+ (k 2/fcnmtdotactnums) k2+ (k 3/cnmtotactnums) k3.. + (kn/fcnmtdotactnums) kn;
the evaluation value P2 for the influence of the number of switching operations of the combination is: ((k1+ k2+ k3.. + kn)/fcnmtolacatnums) ((k1+ k2+ k3.. + kn);
wherein r1 is the influence of the number of single switches, and r2 is the influence of the total number of combined switches; let Cnm contain m combinations, one of which is San; k1, k2, k3.. kn respectively represent switch serial numbers contained in the combination; d1 represents the number of k1 actions, d2 represents the number of k2 actions, d3 represents the number of k3 actions. fcnmtotlactnums represents the sum of the number of actions for each combination in Cnm;
then calculating a combined switch action evaluation value serEviateaActionNums r 1P 1+ r 2P 2;
s4, when the a phase is positive, all combinations of the a phase switching sequences are:
Figure BDA0002867926100000021
the total number of the switches on the phase A is Na, A1 is the load current value on the switches, and a1 is the ID number of the switches;
computing
Figure BDA0002867926100000022
The sum of the load currents of all the switches is calculated, and the sum of the switch currents of all the combinations is calculated, namely the current value SerTotal which can be compensated by the combination;
s5, calculating the total evaluation value serTotalweight of each combination
R3*(serEvaluateActionNums-fserEvaluateActionNumsMin)/L1+R4*(SerTotalDeta-fSerTotalDetaMin)/L2；
The dimensionless scale of the compensated evaluation value serEvaluateActionNums is L1: (fserevelautaactionnummax-fserevelautnminm);
the dimensionless range of the combined action number evaluation value sertotalteltata is L2: (fSerTotalDetamax-fSerTotalDetamin);
wherein fSerTotalDetamax denotes the maximum value of SerTotalDeta in all combinations;
fSerTotalDetamin notation
Figure BDA0002867926100000031
Minimum value of sertotalteltata in all combinations of (a); SerTotalDeta denotes
Figure BDA0002867926100000032
The combination of (1) can compensate for the phase difference between the current value SerTotal and the difference between the positive phase and the ideal value;
fsereveratalataactionnummin representation
Figure BDA0002867926100000033
The minimum value of the combined action number evaluation value serEvaluateActionNums in all the combinations of (1);
fserevalatateaminnummax representation
Figure BDA0002867926100000034
The maximum value of the combined action number evaluation value serEvaluateActionNums in all the combinations of (1);
then is at
Figure BDA0002867926100000035
Find the combination SA with the smallest serTotalWeight in the combinations of1Obtained by the above method
Figure BDA0002867926100000036
Combination SA with minimal serTotalWeight in the combination of (1)2… … and so on to find the SA1，SA2...SANa；
S6 recalculating SA1，SA2...SANaThe serEvaluateActionNums value and the SerTotalDeta value of each combination are used for finding out the SA in the mode of step S51，SA2...SANaFinding the combination SA with the minimum serTotalWeight in the combinationok。
Preferably, in step S1: representing ideal values of three-phase current after compensation
Figure BDA0002867926100000037
Wherein A is the current value on the host machine phase A; b is the current value on the phase B of the host; and C is the current value on the host C phase.
Preferably, in step S2:
switching sequence on phase a: ({ A1, a1}, { A2, a2}, …), the total number of switches on the A phase is Na, A1 is the load current value on the switch, a1 is the ID number of the switch, and so on;
switching sequence on phase B: ({ B1, B1}, { B2, B2}, …), the total number of switches in the B phase is Nb, B1 is the load current value on the switch, B1 is the ID number of the switch, and so on;
switching sequence on phase C: ({ C1, C1}, { C2, C2}, …), the total number of switches in the C-phase is Nc, C1 is the load current value on the switches, C1 is the switch ID number, and so on;
all combinations of the a-phase switching sequences are:
Figure BDA0002867926100000041
all combinations of the B-phase switching sequences are:
Figure BDA0002867926100000042
all combinations of C-phase switching sequences are:
Figure BDA0002867926100000043
preferably, in step S5, sertotalteta is used to indicate which combination can be better compensated, and sertotalteta is fabs (SerTotal- (a-targetX));
where SerTotal represents the current value that this combination can compensate for; a represents the A phase current, and can be replaced by the B phase current or the C phase current; targetX represents the ideal value of the three-phase current after compensation.
Preferably, the step S6 recalculates SA1，SA2...SANaThe serEvaluateActionNums value of each combination in (1) is as follows:
will SA1，SA2...SANaThe total times of the switch actions in the several combinations are added to obtain ultotalActTimes, and similarly, the evaluation value of the times of the single switch actions in the combination is considered to be P3, the influence factor is R5, the evaluation values of all the switches in the combination are P4, and the influence factor is R6;
the combination comprises switches with serial numbers of not only kk1, kk2, kk3,...... kkn;
the number of actions dd1 of kk1, dd2 of kk2, dd3 of kk3,. kkn of actions ddn;
then, the two are combined to obtain an action frequency evaluation value in each combination:
P3＝(kk1/ulTotalActTimes)*kk1+(kk2/ulTotalActTimes)*kk2+(kk3/ulTotalActTimes)*kk3...+(kkn/ulTotalActTimes)*kkn；
P4＝((kk1+kk2+kk3...+kkn)/ulTotalActTimes)*(kk1+kk2+kk3...+kkn)；
the combined switch operation evaluation value serEvaluateActionNums P3R 5+ P4R 6 is calculated.
Preferably, the step S6 recalculates SA1，SA2...SANaThe sertotalteta values for each combination in (1) are as follows: sertotalteltata ═ fabs (SerTotal- (a-targetX));
order: the influence factor of sertotalteta is R7; the impact factor of sereveralataactionnums is R8;
finding SA1，SA2...SANaThe maximum value of sertotalteltata in all combinations in (d) fsertotaltemax;
finding SA1，SA2...SANaThe minimum value of sertotalteltata in all combinations in (d) fsertalteltamin;
finding SA1，SA2...SANaThe minimum value fserevalatateaponnmin of sereveralatateaponumus in all combinations in (a);
finding SA1，SA2...SANaThe maximum value fserevalatateaponnums of sereveralutateaponunmax in all combinations in (1);
let the dimensionless scale of the compensated evaluation value serEvaluateActionNums be LL 1: (fserevelautaactionnummax-fserevelautnminm);
let the dimensionless range of the combined action number evaluation value sertotalteta be LL 2: (fSerTotalDetamax-fSerTotalDetamin);
total rating serTotalweight for each combination
R8*(serEvaluateActionNums-fserEvaluateActionNumsMin)/LL1+
R7*(SerTotalDeta-fSerTotalDetaMin)/LL2；
Then at SA1，SA2...SANaFinding the combination SA with the minimum serTotalWeight in the combinationok。
Compared with the prior art, the invention has the beneficial effects that: the invention takes the minimum three-phase unbalance after single adjustment and the minimum sum of the action times of the commutation switch control sequence in single adjustment as the control target, has short calculation time, can obtain the optimal solution, and subdivides the commutation switch times into: the total times of all switch actions and the times of single switch actions, if the total times of all switch actions in a scheme is not high, but if the times of all switch actions in one scheme are 'particularly high' (the particularly high times can be distinguished by a weight value), the prior art also makes a corresponding cut under a given weight value, and conversely, if the total times of all switch actions in a scheme is even higher but the times of each switch in the scheme are more average, the algorithm can be 'considered as appropriate' (evaluated according to the weight value, which is proved to be very sensitive in experiments), so that the algorithm is more intelligent.
Drawings
Fig. 1 is an exploded structural view of an object of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: the normalization method based on the multi-target three-phase unbalance adjustment comprises the following steps:
s1, respectively obtaining phase currents of three phases at the outgoing line side of the distribution transformer, calculating the unbalance degree of the three phases according to the phase currents of the three phases, and obtaining a phase current balance ideal value according to the unbalance degree of the three phases; representing ideal values of three-phase current after compensation
Figure BDA0002867926100000061
Wherein A is the current value on the host machine phase A; b is the current value on the phase B of the host; and C is the current value on the host C phase.
S2, selecting phase current of any phase, comparing the selected phase current with the phase current balance ideal value, when the selected phase current is larger than the phase current balance ideal value, calculating a compensation current value between the selected phase current and the phase current balance optimized value, and acquiring a total load current sequence of the phase change switches and a plurality of phase change switch combinations on the selected phase;
s3, the influence evaluation value P1 of the single switch action times is as follows: (k 1/fcnmtdotactnums) k1+ (k 2/fcnmtdotactnums) k2+ (k 3/cnmtotactnums) k3.. + (kn/fcnmtdotactnums) kn;
the evaluation value P2 for the influence of the number of switching operations of the combination is: ((k1+ k2+ k3.. + kn)/fcnmtolacatnums) ((k1+ k2+ k3.. + kn);
the influence of the two influence quantities on the serEvaluateActionNums is balanced by introducing a weight factor, wherein the influence factors of the two influence quantities are given by using an expert evaluation method:
wherein r1 is the influence of the number of single switches, and r2 is the influence of the total number of combined switches; let Cnm contain m combinations, one of which is San; k1, k2, k3.. kn respectively represent switch serial numbers contained in the combination; d1 represents the number of k1 actions, d2 represents the number of k2 actions, d3 represents the number of k3 actions. fcnmtotlactnums represents the sum of the number of actions for each combination in Cnm;
then calculating a combined switch action evaluation value serEviateaActionNums r 1P 1+ r 2P 2;
s4, when the a phase is positive, all combinations of the a phase switching sequences are:
Figure BDA0002867926100000071
the total number of the switches on the phase A is Na, A1 is the load current value on the switches, and a1 is the ID number of the switches;
computing
Figure BDA0002867926100000072
And calculating the sum of the switching currents of all the combinations, namely the current value SerTotal which can be compensated by the combination.
S5, calculating the total evaluation value serTotalweight of each combination
R3*(serEvaluateActionNums-fserEvaluateActionNumsMin)/L1+R4*(SerTotalDeta-fSerTotalDetaMin)/L2；
The dimensionless scale of the compensated evaluation value serEvaluateActionNums is L1: (fserevelautaactionnummax-fserevelautnminm);
the dimensionless range of the combined action number evaluation value sertotalteltata is L2: (fSerTotalDetamax-fSerTotalDetamin);
wherein fSerTotalDetamax denotes the maximum value of SerTotalDeta in all combinations;
fSerTotalDetamin
Figure BDA0002867926100000081
Minimum value of sertotalteltata in all combinations of (a); SerTotalDeta denotes
Figure BDA0002867926100000082
The combination of (1) can compensate for the phase difference between the current value SerTotal and the difference between the positive phase and the ideal value;
sertotalteta is used to indicate which combination can be better compensated for evaluation, and sertotalteta is fabs (SerTotal- (a-targetX));
where SerTotal represents the current value that this combination can compensate for; a represents the A phase current, and can be replaced by the B phase current or the C phase current; targetX represents the ideal value of the three-phase current after compensation.
fsereveratalataactionnummin representation
Figure BDA0002867926100000083
The minimum value of the combined action number evaluation value serEvaluateActionNums in all the combinations of (1);
fserevalatateaminnummax representation
Figure BDA0002867926100000084
The maximum value of the combined action number evaluation value serEvaluateActionNums in all the combinations of (1);
then is at
Figure BDA0002867926100000085
Find the combination SA with the smallest serTotalWeight in the combinations of1Obtained by the above method
Figure BDA0002867926100000086
Combination SA with minimal serTotalWeight in the combination of (1)2… … and so on to find the SA1，SA2...SANa；
S6 recalculating SA1，SA2...SANaThe serEvaluateActionNums value and the SerTotalDeta value of each combination are used for finding out the SA in the mode of step S51，SA2...SANaFinding the combination SA with the minimum serTotalWeight in the combinationok. At SA1，SA2...SANaThe optimal combination is selected again, and sereveralataactionnums and sertotaltedeta need to be recalculated and then normalized, because the comparison range is changed.
Recalculating SA1，SA2...SANaThe serEvaluateActionNums value of each combination in (1) is as follows:
will SA1，SA2...SANaThe total number of switching events in these combinations is summed to yield ultotalcattimes, the same appliesConsidering the evaluation value of the number of times of single switch action in the combination as P3, the influence factor as R5, and the evaluation values of all switches in the combination as P4, the influence factor as R6;
the combination comprises switches with serial numbers of not only kk1, kk2, kk3,...... kkn;
the number of actions dd1 of kk1, dd2 of kk2, dd3 of kk3,. kkn of actions ddn;
then, the two are combined to obtain an action frequency evaluation value in each combination:
P3＝(kk1/ulTotalActTimes)*kk1+(kk2/ulTotalActTimes)*kk2+(kk3/ulTotalActTimes)*kk3...+(kkn/ulTotalActTimes)*kkn；
P4＝((kk1+kk2+kk3...+kkn)/ulTotalActTimes)*(kk1+kk2+kk3...+kkn)；
the combined switch operation evaluation value serEvaluateActionNums P3R 5+ P4R 6 is calculated.
Recalculating SA1，SA2...SANaThe sertotalteta values for each combination in (1) are as follows: sertotalteltata ═ fabs (SerTotal- (a-targetX));
order: the influence factor of sertotalteta is R7; the impact factor of sereveralataactionnums is R8;
finding SA1，SA2...SANaThe maximum value of sertotalteltata in all combinations in (d) fsertotaltemax;
finding SA1，SA2...SANaThe minimum value of sertotalteltata in all combinations in (d) fsertalteltamin;
finding SA1，SA2...SANaThe minimum value fserevalatateaponnmin of sereveralatateaponumus in all combinations in (a);
finding SA1，SA2...SANaThe maximum value fserevalatateaponnums of sereveralutateaponunmax in all combinations in (1);
let the dimensionless scale of the compensated evaluation value serEvaluateActionNums be LL 1: (fserevelautaactionnummax-fserevelautnminm);
let the dimensionless range of the combined action number evaluation value sertotalteta be LL 2: (fSerTotalDetamax-fSerTotalDetamin);
total rating serTotalweight for each combination
R8*(serEvaluateActionNums-fserEvaluateActionNumsMin)/LL1+
R7*(SerTotalDeta-fSerTotalDetaMin)/LL2；
Then at SA1，SA2...SANaFinding out the combination SA with the minimum (optimal) of serTotalWeight in the combinationok。
As shown in fig. 1, the total price target is composed of two evaluation target switching frequency and unbalance, and the total evaluation target value is: sertotaltweight; the target of imbalance among them is fully measured by whether the three-phase load is close to targetX. The evaluation target of the number of times of switching actions is quantized to be: sereveralatateamonnums. The sereveralutateadonnums can be decomposed into two sub-targets, the number of single switch actions and the sum of the number of all switch actions in the combination. If the number of switching operations in the combination is particularly large, the evaluation value of the switching operations of the whole combination is greatly influenced, that is, an extreme case may be that the whole combination is abandoned because the number of switching operations in the combination is particularly large. Another consideration is the sum of the number of all switching actions in the combination.
Introduction of the normalization method:
since the two indexes are considered, one is the switching compensation value on a certain phase, and the other is the switching action times on a certain phase, the two indexes are not comparable originally, and even the two indexes have different dimensions. If the two indexes are considered comprehensively, the two indexes need to be normalized after the dimensions of the two indexes in respective fields are removed in a comparison range.
A simple one-dimensional data scaling method is adopted for normalization, and the method comprises the following steps:
the min-max normalization method, also known as dispersion normalization, is a linear transformation of the raw data, mapping the result into a [0-1] region. The transfer function is:
Figure BDA0002867926100000111
wherein X*Max is the maximum value of the sample data and min is the minimum value of the sample data. This method has the disadvantage that when new data is added, it may cause a change in max and min, requiring redefinition, without this concern in the commutation switch.
We define the comprehensively considered index as serTotalWeight, which is called total weight for short.
Initial conditions:
Figure BDA0002867926100000112
Figure BDA0002867926100000121
A＝37.25；B＝19.71；C＝0.103919；targetX＝(A+B+C)/3＝19.021307A
the unbalance before improvement is max ((Imax-Iavg), (Imin-Iavg))/Iavg is 0.994537;
and it follows that the overall strategy is that a and B compensate for this phase C like, and:
a corresponds to the cut-off g _ fDeta-a-targetX-18.228693 to phase C;
b corresponds to the cut-off g _ fDeta-B-targetX 0.688692093 to phase C;
note that: (the threshold value for the offset gap is 0.5A, i.e., fDeta >0.5A needs to be cut off)
The C phase is the compensated phase.
Combined calculation of phase a:
the phase a switching case is shown in the following table:
Figure BDA0002867926100000122
there are four switches on phase a, so the combination of switches on phase a is as follows (we only keep the first three combinations with smallest sertotalt (SerTotal- (a-targetX)) in the sorting process due to the problem of memory space), so the combination of the first three rows is mainly observed:
note that: SerTotalDeta-for evaluating the difference of the combined compensation value from the standard compensation value;
SerTotalDeta＝fabs(SerTotal-(A-targetX))；
the sum of the number of all switch actions in the sertotai actionnums combination;
the evaluation times of the serEvalauateActionNums combined switch action;
overall evaluation value of serTotalWeight.
Figure BDA0002867926100000131
The combination of (1):
Figure BDA0002867926100000132
Figure BDA0002867926100000133
the combination of (1):
Figure BDA0002867926100000134
Figure BDA0002867926100000135
the combination of (1):
Figure BDA0002867926100000136
Figure BDA0002867926100000141
the combination of (1):
Figure BDA0002867926100000142
selecting the final optimal combination
Handle
Figure BDA0002867926100000143
The most optimal combinations in (1) are listed in a table:
Figure BDA0002867926100000144
renormalization gives:
Figure BDA0002867926100000145
Figure BDA0002867926100000151
after the processing is finished, the group with the minimum weight value is found to represent the optimal compensation combination, and the switch serial number is 3, and the switch serial number is 1.
Combined calculation of phase B:
Figure BDA0002867926100000152
there are 2 switches on the B phase, so the combination of the switches on the a phase is as follows (we only save the first three combinations with the smallest sertotalt (SerTotal- (a-targetX)) in the sorting process due to the problem of memory space), so the combination of the first three rows is mainly observed:
Figure BDA0002867926100000153
the combination of (1):
Figure BDA0002867926100000154
Figure BDA0002867926100000155
the combination of (1):
Figure BDA0002867926100000156
selecting the final optimal combination
Handle
Figure BDA0002867926100000161
The most optimal combinations in (1) are listed in a table:
Figure BDA0002867926100000162
renormalization gives:
Figure BDA0002867926100000163
after processing, the group with the smallest weight value is found to represent the optimal compensation combination, and the group is marked with red.
However, B is not suitable for switching into C phase finally, because B phase is not as effective as B phase in time with optimal combination, which is another subject not discussed here.
1.3.4 analysis of experimental print:
the degree of unbalance 0.994537 before improvement; a, coherent cutting;
Figure BDA0002867926100000164
the sequence is as follows:
optimal compensation combination of the slave switches:
1--0--0--0--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
9.48--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
9.480000 is the compensation total value of the optimal compensation combination of the slave switches;
the error between the slave switch optimal compensation combination compensation total value and the target compensation value is-8.748693;
0.678667 is used for compensating the comprehensive weight value of the optimal compensation combination of the slave switches.
Figure BDA0002867926100000171
The sequence is as follows:
optimal compensation combination of the slave switches:
3--1--0--0--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
8.64--9.48--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
18.119999 is the compensation total value of the optimal compensation combination of the slave switches;
the error between the slave switch optimal compensation combination compensation total value and the target compensation value is-0.108694;
0.529499 is used for compensating the comprehensive weight value of the optimal compensation combination of the slave switches.
Figure BDA0002867926100000172
The sequence is as follows:
optimal compensation combination of the slave switches:
4--3--2--0--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
9.41--8.64--8.93--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
26.980000 is the compensation total value of the optimal compensation combination of the slave switches;
8.751307, the error between the slave switch optimal compensation combination compensation total value and the target compensation value;
the optimal compensation combination of the switches of the slave machines compensates the comprehensive weight of 0.000000.
Figure BDA0002867926100000173
The sequence is as follows:
optimal compensation combination of the slave switches:
4--3--2--1--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
9.41--8.64--8.93--9.48--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
36.459999 is the compensation total value of the optimal compensation combination of the slave switches;
18.231306, the error between the slave switch optimal compensation combination compensation total value and the target compensation value;
the optimal compensation combination of the switches of the slave machines compensates the comprehensive weight of 0.000000.
The optimal sequence after 1 phase recalculation is (1-A phase 2-B phase 3-C phase), and the weight takes into account all permutation and combination of the phase switch including transverse and longitudinal comparison:
Figure BDA0002867926100000181
the sequence is as follows:
optimal compensation combination of the slave switches:
1--0--0--0--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
9.48--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
9.480000 is the compensation total value of the optimal compensation combination of the slave switches;
the error between the slave switch optimal compensation combination compensation total value and the target compensation value is-8.748693;
0.453972 is used for compensating the comprehensive weight value of the optimal compensation combination of the slave switches.
The optimal sequence after 1 phase recalculation is (1-A phase; 2-B phase; 3-C phase), and the weight takes into account all permutation and combination of the phase switch including transverse and longitudinal comparison:
Figure BDA0002867926100000182
the sequence is as follows:
optimal compensation combination of the slave switches:
3--1--0--0--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
8.64--9.48--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
18.119999 is the compensation total value of the optimal compensation combination of the slave switches;
the error between the slave switch optimal compensation combination compensation total value and the target compensation value is-0.108694;
0.345247 is used for compensating the comprehensive weight value of the optimal compensation combination of the slave switches.
The optimal sequence after 1 phase recalculation is (1-A phase; 2-B phase; 3-C phase), and the weight takes into account all permutation and combination of the phase switch including transverse and longitudinal comparison:
Figure BDA0002867926100000191
the sequence is as follows:
optimal compensation combination of the slave switches:
4--3--2--0--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
9.41--8.64--8.93--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
26.980000 is the compensation total value of the optimal compensation combination of the slave switches;
8.751307, the error between the slave switch optimal compensation combination compensation total value and the target compensation value;
0.620049 is used for compensating the comprehensive weight value of the optimal compensation combination of the slave switches.
The optimal sequence after 1 phase recalculation is (1-A phase; 2-B phase; 3-C phase), and the weight takes into account all permutation and combination of the phase switch including transverse and longitudinal comparison:
Figure BDA0002867926100000192
the sequence is as follows:
optimal compensation combination of the slave switches:
4--3--2--1--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
9.41--8.64--8.93--9.48--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
36.459999 is the compensation total value of the optimal compensation combination of the slave switches;
18.231306, the error between the slave switch optimal compensation combination compensation total value and the target compensation value;
the optimal compensation combination compensation comprehensive weight of the slave switch is 1.000000.
Cutting of B phase
Figure BDA0002867926100000201
The sequence is as follows:
optimal compensation combination of the slave switches:
5--0--0--0--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
9.48--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
9.480000 is the compensation total value of the optimal compensation combination of the slave switches;
8.791307, the error between the slave switch optimal compensation combination compensation total value and the target compensation value;
0.300000 is used for compensating the comprehensive weight value of the optimal compensation combination of the slave switches.
Figure BDA0002867926100000202
The sequence is as follows:
optimal compensation combination of the slave switches:
6--5--0--0--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
9.62--9.48--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
19.099998 is the compensation total value of the optimal compensation combination of the slave switches;
18.411306, the error between the slave switch optimal compensation combination compensation total value and the target compensation value;
the optimal compensation combination of the switches of the slave machines compensates the comprehensive weight of 0.000000.
The optimal sequence after 2 phases recalculate the weight is (1-A phase; 2-B phase; 3-C phase), and the weight considers all permutation and combination of the phase switch including transverse and longitudinal comparison:
Figure BDA0002867926100000211
the sequence is as follows:
optimal compensation combination of the slave switches:
5--0--0--0--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
9.48--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
9.480000 is the compensation total value of the optimal compensation combination of the slave switches;
8.791307, the error between the slave switch optimal compensation combination compensation total value and the target compensation value;
the optimal compensation combination of the switches of the slave machines compensates the comprehensive weight of 0.000000.
The optimal sequence after 2-phase recalculation is (1-A phase 2-B phase 3-C phase), and the weight takes into account all permutation and combination of the phase switches including transverse and longitudinal comparison:
Figure BDA0002867926100000212
the sequence is as follows:
optimal compensation combination of the slave switches:
6--5--0--0--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
9.62--9.48--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
19.099998 is the compensation total value of the optimal compensation combination of the slave switches;
18.411306, the error between the slave switch optimal compensation combination compensation total value and the target compensation value;
the optimal compensation combination compensation comprehensive weight of the slave switch is 1.000000.
C participates in being compensated; two-phase compensation one-phase strategy; the A phase and the B phase are complemented with the C phase; no cut to phase 3 was made for phase 2 because there was no suitable sequence.
Switching results of the switches:
an action switch ID: 3; an action switch source 1; the target phase of the action switch is 3;
8.640000 action switch current
1, an action switch ID; an action switch source 1; the target phase of the action switch is 3;
9.480000 action switch current
The calculated imbalance 0.041921.
Improving, issuing slave action sequence
Modifying certain switch action times to carry out a comparison experiment:
and (3) carrying out a test to change the number of times of the switching action with the ID of 3 more, and calculating whether the strategy is changed:
Figure BDA0002867926100000221
Figure BDA0002867926100000231
the tabular data is not being analyzed in a cumulative manner,
the results were analyzed as follows:
the degree of unbalance 0.994537 before improvement; a phase participates in the cutting
Figure BDA0002867926100000232
The sequence is as follows:
optimal compensation combination of the slave switches:
1--0--0--0--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
9.48--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00；
9.480000 is the compensation total value of the optimal compensation combination of the slave switches;
the error between the slave switch optimal compensation combination compensation total value and the target compensation value is-8.748693;
0.678667 is used for compensating the comprehensive weight value of the optimal compensation combination of the slave switches.
Figure BDA0002867926100000233
The sequence is as follows:
optimal compensation combination of the slave switches:
4--2--0--0--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
9.41--8.93--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
18.340000 is the compensation total value of the optimal compensation combination of the slave switches;
0.111307, the error between the slave switch optimal compensation combination compensation total value and the target compensation value;
0.535864 is used for compensating the comprehensive weight value of the optimal compensation combination of the slave switches.
Figure BDA0002867926100000234
The sequence is as follows:
optimal compensation combination of the slave switches:
4--3--2--0--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
9.41--8.64--8.93--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
26.980000 is the compensation total value of the optimal compensation combination of the slave switches;
8.751307, the error between the slave switch optimal compensation combination compensation total value and the target compensation value;
the optimal compensation combination of the switches of the slave machines compensates the comprehensive weight of 0.000000.
Figure BDA0002867926100000241
The sequence is as follows:
optimal compensation combination of the slave switches:
4--3--2--1--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
9.41--8.64--8.93--9.48--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
36.459999 is the compensation total value of the optimal compensation combination of the slave switches;
18.231306, the error between the slave switch optimal compensation combination compensation total value and the target compensation value;
the optimal compensation combination of the switches of the slave machines compensates the comprehensive weight of 0.000000.
The optimal sequence after 1 phase recalculation is (1-A phase; 2-B phase; 3-C phase), and the weight takes into account all permutation and combination of the phase switch including transverse and longitudinal comparison:
Figure BDA0002867926100000242
the sequence is as follows:
optimal compensation combination of the slave switches:
1--0--0--0--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
9.48--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
9.480000 is the compensation total value of the optimal compensation combination of the slave switches;
the error between the slave switch optimal compensation combination compensation total value and the target compensation value is-8.748693;
0.453972 is used for compensating the comprehensive weight value of the optimal compensation combination of the slave switches.
The optimal sequence after 1 phase recalculation is (1-A phase 2-B phase 3-C phase), and the weight takes into account all permutation and combination of the phase switch including transverse and longitudinal comparison:
Figure BDA0002867926100000251
the sequence is as follows:
optimal compensation combination of the slave switches:
4--2--0--0--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
9.41--8.93--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
18.340000 is the compensation total value of the optimal compensation combination of the slave switches;
0.111307, the error between the slave switch optimal compensation combination compensation total value and the target compensation value;
0.243900 is used for compensating the comprehensive weight value of the optimal compensation combination of the slave switches.
The optimal sequence after 1 phase recalculation is (1-A phase 2-B phase 3-C phase), and the weight takes into account all permutation and combination of the phase switch including transverse and longitudinal comparison:
Figure BDA0002867926100000252
the sequence is as follows:
optimal compensation combination of the slave switches:
4--3--2--0--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
9.41--8.64--8.93--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
26.980000 is the compensation total value of the optimal compensation combination of the slave switches;
8.751307, the error between the slave switch optimal compensation combination compensation total value and the target compensation value;
0.672351 is used for compensating the comprehensive weight value of the optimal compensation combination of the slave switches.
The optimal sequence after 1 phase recalculation is (1-A phase 2-B phase 3-C phase), and the weight takes into account all permutation and combination of the phase switch including transverse and longitudinal comparison:
Figure BDA0002867926100000261
the sequence is as follows:
optimal compensation combination of the slave switches:
4--3--2--1--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
9.41--8.64--8.93--9.48--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
36.459999 is the compensation total value of the optimal compensation combination of the slave switches;
18.231306, the error between the slave switch optimal compensation combination compensation total value and the target compensation value;
the optimal compensation combination compensation comprehensive weight of the slave switch is 1.000000.
Cutting of B phase
Figure BDA0002867926100000262
The sequence is as follows:
optimal compensation combination of the slave switches:
5--0--0--0--0--0--0--0--0--0--0--0--0--0--0--0
slave switch current value
:9.48--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
9.480000 is the compensation total value of the optimal compensation combination of the slave switches;
8.791307, the error between the slave switch optimal compensation combination compensation total value and the target compensation value;
0.300000 is used for compensating the comprehensive weight value of the optimal compensation combination of the slave switches.
Figure BDA0002867926100000263
The sequence is as follows:
optimal compensation combination of the slave switches:
6--5--0--0--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
9.62--9.48--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
19.099998 is the compensation total value of the optimal compensation combination of the slave switches;
18.411306, the error between the slave switch optimal compensation combination compensation total value and the target compensation value;
the optimal compensation combination of the switches of the slave machines compensates the comprehensive weight of 0.000000.
The optimal sequence after 2 phases recalculate the weight is (1-A phase; 2-B phase; 3-C phase), and the weight considers all permutation and combination of the phase switch including transverse and longitudinal comparison:
Figure BDA0002867926100000271
the sequence is as follows:
optimal compensation combination of the slave switches:
5--0--0--0--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
9.48--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
9.480000 is the compensation total value of the optimal compensation combination of the slave switches;
8.791307, the error between the slave switch optimal compensation combination compensation total value and the target compensation value;
the optimal compensation combination of the switches of the slave machines compensates the comprehensive weight of 0.000000.
The optimal sequence after 2-phase recalculation is (1-A phase 2-B phase 3-C phase), and the weight takes into account all permutation and combination of the phase switches including transverse and longitudinal comparison:
Figure BDA0002867926100000272
the sequence is as follows:
optimal compensation combination of the slave switches:
6--5--0--0--0--0--0--0--0--0--0--0--0--0--0--0
slave switching current value:
9.62--9.48--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00--0.00
19.099998 is the compensation total value of the optimal compensation combination of the slave switches;
18.411306, the error between the slave switch optimal compensation combination compensation total value and the target compensation value;
the optimal compensation combination compensation comprehensive weight of the slave switch is 1.000000.
C participation is compensated
Two-phase compensation one-phase strategy, the A and B phases complement to the C phase, and the 2 phase is not cut into the 3 phase because of no proper sequence.
Switching results of the switches:
an action switch ID: 4; an action switch source 1; the target phase of the action switch is 3.
9.410000 action switch current
An action switch ID of 2; an action switch source 1; the target phase of the action switch is 3.
8.930000 action switch current
The calculated imbalance 0.036206.
Improving, issuing slave action sequence
The results of two experimental comparisons can be seen: when the number of times of certain switch actions is obviously increased, the strategy can be adjusted according to the factor and the combination which is considered to be the most at present is selected, and the effect is obvious.
In the prior art, when multi-target evaluation is performed, an iterative method is used, that is, after an optimal scheme is searched in one target (imbalance degree), an optimal scheme is searched in another target. Therefore, the strategy process is complex, and the scheme which is finally searched is not optimal possibly, because the optimal scheme in the target 1 is not optimal when final comprehensive judgment is possible, the scheme which is not optimal in the target 1 is excluded in advance, and the purpose of multi-target comprehensive judgment is not achieved. The multi-target fusion modeling used by the two technical schemes finds the evaluation target at the beginning of searching, and a real ideal scheme can be found in the subsequent searching according to the target.
The iteration method used in the multi-target evaluation in the prior art comprises the specific steps of finding several schemes with the former balance degree in all the schemes, then optimizing the schemes, such as a scheme for eliminating switching faults, a scheme for eliminating large-current commutation, and a scheme with the least commutation times selected from the last remaining schemes, wherein a method for obtaining a comprehensive evaluation value by performing mathematical modeling on an evaluation target is only a method for screening each target, and is a method of a traditional multi-target evaluation system without great innovation. The method for modeling the multi-target evaluation value provided by the technical scheme is obviously different from the traditional screening method, greatly simplifies the algorithm complexity and has innovation and practicability. And the traditional method does not subdivide the phase change times in the target, perhaps the prior art cannot subdivide the phase change times at all, but the technical scheme subdivides the phase change switch times into: the total times of all switch actions and the times of single switch actions in a scheme mean that if the total times of all switch actions in a scheme is not high, but if the times of actions of one switch are 'particularly high' (particularly high can be distinguished by weight values), the prior art makes corresponding choices under a given weight value, and conversely, if the total times of actions of all switches in a scheme are even higher but the times of each switch in the scheme are average, the algorithm can be 'considered as appropriate' (evaluated according to the weight values, which also proves that the effect is very sensitive in experiments), and the algorithm is more intelligent.
According to the prior art, whether the evaluation is based on the target 1 or the target 2 cannot be determined, and if the weights of the two evaluation are subversive, whether the searching sequence is changed greatly or not directly results in non-uniqueness of a final scheme of the multi-target evaluation system, but the method used by the technical scheme models multiple targets in advance, quantifies the evaluation target into an evaluation value, and has an optimal method in any way.
In the prior art, corresponding changes are inevitably made on a searching method when the weight is changed greatly, but the method for searching the strategy when each target weight is changed in the technical scheme is not changed at all, because the influence brought by different weights is fully reflected in a unique evaluation value due to the establishment of the multi-target mathematical model. The method has the advantage that the search algorithm is stable and robust.
In the prior art, serial iteration is performed among multiple targets, the risk of entering a dead loop exists during iteration, the method for adjusting the risk is long, the algorithm time is long, and the adjustment has the risk of further deviating from the optimal solution. Without this risk.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (6)

1. The normalization method based on multi-target three-phase unbalance adjustment is characterized by comprising the following steps of: the method comprises the following steps:
s1, respectively obtaining phase currents of three phases at the outgoing line side of the distribution transformer, calculating the unbalance degree of the three phases according to the phase currents of the three phases, and obtaining a phase current balance ideal value according to the unbalance degree of the three phases;
s2, selecting phase current of any phase, comparing the selected phase current with the phase current balance ideal value, when the selected phase current is larger than the phase current balance ideal value, calculating a compensation current value between the selected phase current and the phase current balance optimized value, and acquiring a total load current sequence of the phase change switches and a plurality of phase change switch combinations on the selected phase;
s3, the influence evaluation value P1 of the single switch action times is as follows: (k 1/fcnmtdotactnums) k1+ (k 2/fcnmtdotactnums) k2+ (k 3/cnmtotactnums) k3.. + (kn/fcnmtdotactnums) kn;
the evaluation value P2 for the influence of the number of switching operations of the combination is: ((k1+ k2+ k3.. + kn)/fcnmtolacatnums) ((k1+ k2+ k3.. + kn);
wherein r1 is the influence of the number of single switches, and r2 is the influence of the total number of combined switches; let Cnm contain m combinations, one of which is San; k1, k2, k3.. kn respectively represent switch serial numbers contained in the combination; d1 represents the number of k1 actions, d2 represents the number of k2 actions, d3 represents the number of k3 actions. fcnmtotlactnums represents the sum of the number of actions for each combination in Cnm;
then calculating a combined switch action evaluation value serEviateaActionNums r 1P 1+ r 2P 2;
s4, when the a phase is positive, all combinations of the a phase switching sequences are:
Figure FDA0002867926090000011
the total number of the switches on the phase A is Na, A1 is the load current value on the switches, and a1 is the ID number of the switches;
computing
Figure FDA0002867926090000012
The sum of the load currents of all the switches is calculated, and the sum of the switch currents of all the combinations is calculated, namely the current value SerTotal which can be compensated by the combination;
s5, calculating the total evaluation value serTotalweight of each combination
R3*(serEvaluateActionNums-fserEvaluateActionNumsMin)/L1+R4*(SerTotalDeta-fSerTotalDetaMin)/L2；
The dimensionless scale of the compensated evaluation value serEvaluateActionNums is L1: (fserevelautaactionnummax-fserevelautnminm);
the dimensionless range of the combined action number evaluation value sertotalteltata is L2: (fSerTotalDetamax-fSerTotalDetamin);
wherein fSerTotalDetamax denotes the maximum value of SerTotalDeta in all combinations;
fSerTotalDetamin
Figure FDA0002867926090000021
Minimum value of sertotalteltata in all combinations of (a); SerTotalDeta denotes
Figure FDA0002867926090000022
The combination of (1) can compensate for the phase difference between the current value SerTotal and the difference between the positive phase and the ideal value;
fsereveratalataactionnummin representation
Figure FDA0002867926090000023
The minimum value of the combined action number evaluation value serEvaluateActionNums in all the combinations of (1);
fserevalatateaminnummax representation
Figure FDA0002867926090000024
The maximum value of the combined action number evaluation value serEvaluateActionNums in all the combinations of (1);
then is at
Figure FDA0002867926090000025
Find the combination SA with the smallest serTotalWeight in the combinations of1Obtained by the above method
Figure FDA0002867926090000026
Combination SA with minimal serTotalWeight in the combination of (1)2… … and so on to find the SA1，SA2...SANa；
S6 recalculating SA1，SA2...SANaThe serEvaluateActionNums value and the SerTotalDeta value of each combination are used for finding out the SA in the mode of step S51，SA2...SANaFinding the combination SA with the minimum serTotalWeight in the combinationok。
2. The multi-objective three-phase imbalance regulation-based normalization method of claim 1, wherein: in the step S1: representing ideal values of three-phase current after compensation
Figure FDA0002867926090000031
Wherein A is the current value on the host machine phase A; b is the current value on the phase B of the host; and C is the current value on the host C phase.
3. The multi-objective three-phase imbalance regulation-based normalization method of claim 2, wherein: in the step S2:
switching sequence on phase a: ({ A1, a1}, { A2, a2}, …), the total number of switches on the A phase is Na, A1 is the load current value on the switch, a1 is the ID number of the switch, and so on;
switching sequence on phase B: ({ B1, B1}, { B2, B2}, …), the total number of switches in the B phase is Nb, B1 is the load current value on the switch, B1 is the ID number of the switch, and so on;
switching sequence on phase C: ({ C1, C1}, { C2, C2}, …), the total number of switches in the C-phase is Nc, C1 is the load current value on the switches, C1 is the switch ID number, and so on;
all combinations of the a-phase switching sequences are:
Figure FDA0002867926090000032
all combinations of the B-phase switching sequences are:
Figure FDA0002867926090000033
all combinations of C-phase switching sequences are:
Figure FDA0002867926090000034
4. the multi-objective three-phase imbalance regulation-based normalization method of claim 3, wherein: in step S5, sertotalteta is used to indicate which combination can be better compensated, and sertotalteta is fabs (SerTotal- (a-targetX));
where SerTotal represents the current value that this combination can compensate for; a represents the A phase current, and can be replaced by the B phase current or the C phase current; targetX represents the ideal value of the three-phase current after compensation.
5. The multi-objective three-phase imbalance regulation-based normalization method of claim 4, wherein: the step S6 recalculates SA1，SA2...SANaThe serEvaluateActionNums value of each combination in (1) is as follows:
will SA1，SA2...SANaThe total times of the switch actions in the several combinations are added to obtain ultotalActTimes, and similarly, the evaluation value of the times of the single switch actions in the combination is considered to be P3, the influence factor is R5, the evaluation values of all the switches in the combination are P4, and the influence factor is R6;
the combination comprises switches with serial numbers of not only kk1, kk2, kk3,...... kkn;
the number of actions dd1 of kk1, dd2 of kk2, dd3 of kk3,. kkn of actions ddn;
then, the two are combined to obtain an action frequency evaluation value in each combination:
P3＝(kk1/ulTotalActTimes)*kk1+(kk2/ulTotalActTimes)*kk2+(kk3/ulTotalActTimes)*kk3...+(kkn/ulTotalActTimes)*kkn；
P4＝((kk1+kk2+kk3...+kkn)/ulTotalActTimes)*(kk1+kk2+kk3...+kkn)；
the combined switch operation evaluation value serEvaluateActionNums P3R 5+ P4R 6 is calculated.
6. The multi-objective three-phase imbalance regulation-based normalization method of claim 5, wherein: the step S6 recalculates SA1，SA2...SANaThe sertotalteta values for each combination in (1) are as follows: sertotalteltata ═ fabs (SerTotal- (a-targetX));
order: the influence factor of sertotalteta is R7; the impact factor of sereveralataactionnums is R8;
finding SA1，SA2...SANaThe maximum value of sertotalteltata in all combinations in (d) fsertotaltemax;
finding SA1，SA2...SANaZhongshiThere is a minimum value of sertotalteltacta in the combination fsertotalni;
finding SA1，SA2...SANaThe minimum value fserevalatateaponnmin of sereveralatateaponumus in all combinations in (a);
finding SA1，SA2...SANaThe maximum value fserevalatateaponnums of sereveralutateaponunmax in all combinations in (1);
let the dimensionless scale of the compensated evaluation value serEvaluateActionNums be LL 1: (fserevelautaactionnummax-fserevelautnminm);
let the dimensionless range of the combined action number evaluation value sertotalteta be LL 2: (fSerTotalDetamax-fSerTotalDetamin);
total rating serTotalweight for each combination
R8*(serEvaluateActionNums-fserEvaluateActionNumsMin)/LL1+
R7*(SerTotalDeta-fSerTotalDetaMin)/LL2；
Then at SA1，SA2...SANaFinding the combination SA with the minimum serTotalWeight in the combinationok。
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Citations (3)

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Publication number Priority date Publication date Assignee Title
JP2016025680A (en) * 2014-07-16 2016-02-08 株式会社神戸製鋼所 Imbalance compensation device
CN106877366A (en) * 2017-04-07 2017-06-20 武汉大学 Automatic adjustment method of three-phase load unbalance in distribution network
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016025680A (en) * 2014-07-16 2016-02-08 株式会社神戸製鋼所 Imbalance compensation device
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
CN106877366A (en) * 2017-04-07 2017-06-20 武汉大学 Automatic adjustment method of three-phase load unbalance in distribution network

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