CN102768301A - Method and device for on-line determining withdrawal and compensation electric quantity in three-phase four-wire two-phase current loss - Google Patents

Method and device for on-line determining withdrawal and compensation electric quantity in three-phase four-wire two-phase current loss Download PDF

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CN102768301A
CN102768301A CN2012102877606A CN201210287760A CN102768301A CN 102768301 A CN102768301 A CN 102768301A CN 2012102877606 A CN2012102877606 A CN 2012102877606A CN 201210287760 A CN201210287760 A CN 201210287760A CN 102768301 A CN102768301 A CN 102768301A
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phase
defluidization
current
mean value
unbalancedness
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CN102768301B (en
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陈劲游
彭昭煌
叶华艺
刘均乐
蔡春元
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Zhongshan Power Supply Bureau of Guangdong Power Grid Co Ltd
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Zhongshan Power Supply Bureau of Guangdong Power Grid Co Ltd
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Abstract

Provided are a method and a device for on-line determining withdrawal and compensation electric quantity in three-phase four-wire two-phase current loss. The method includes: obtaining current of each phase in current loss; detecting whether current loss occurs, and if the current loss occurs, determining the average value of the current of the phases before the current loss according to the current of the phases before the current loss, and determining negative-sequence current unbalance degree average value and zero-sequence current unbalance degree average value of the phases having no current loss before the current loss according to the current average value; judging whether the negative-sequence current unbalance degree average value is larger than a first preset threshold value or whether the zero-sequence current unbalance degree average value is larger than a second preset threshold value, if yes, obtaining the current and phase difference of the phases having no current loss before the current loss, determining positive-sequence current of the phases having no current loss and the phase difference of the positive-sequence current and the voltage of the phases having no current loss, and determining the current loss withdrawal and compensation electric quantity according to the positive-sequence current and the phase difference of the positive-sequence current and the voltage. By means of the method and the device for on-line determining withdrawal and compensation electric quantity in three-phase four-wire two-phase current loss, accurate power is obtained through different methods according to the unbalance degree and accordingly the accuracy of current loss withdrawal and compensation electric quantity is improved.

Description

Move back method and the device of mending electric weight during online definite three-phase and four-line two phase defluidizations
Technical field
The present invention relates to electric system electric energy metrical field, move back method and the device of mending electric weight when particularly relating to online definite three-phase and four-line two phase defluidizations.
Background technology
When secondary loop of mutual inductor open circuit that inserts electric energy meter or short circuit, can cause the electric energy meter defluidization.The electric energy meter defluidization causes institute's quantity calculation not conform to actual electric weight, causes the metering of electric weight inaccurate, unreasonable charges etc., need confirm to move back the benefit electric weight, for reasonable fee provides foundation.At present, intelligent three-phase defluidization registering instrument is arranged, be provided with the two-way current detection circuit.The current parameters situation of change that can online detection three-phase circuit be in operation shows the defluidization state, and the record defluidization time also shows.The staff confirms more positive coefficient and defluidization time according to fault power, confirms that user's actual needs moves back the electric weight of benefit, thereby obtains correct electric weight.Yet in the actual motion, the three-phase current unbalance degree varies, staff's direct all three-phase load current balance types of hypothesis when confirming more positive coefficient, and it is bigger to confirm to move back benefit electric weight error.At present, the hypothesis power factor is constant when also having the staff to confirm more positive coefficient according to fault power, confirm with average power factor, and the power load power factor is constantly changing, and to mend the electric weight error big thereby confirm to move back.
Summary of the invention
Based on this; Be necessary to confirm that to prior art defluidization moves back the inaccurate problem of electric weight of mending when three-phase and four-line current imbalance degree varies in size with power factor change; Thereby cause user's actual needs to move back the inaccurate problem of electric weight of benefit, move back method and the device of mending electric weight when a kind of online definite three-phase and four-line two phase defluidizations are provided.
Move back the method for mending electric weight during a kind of online definite three-phase and four-line two phase defluidizations, comprise step:
Obtain the electric current of preceding each phase of defluidization;
Whether detect defluidization; If; Confirm the current average of each phase before the defluidization according to the electric current of each phase before the defluidization, confirm before the defluidization not the negative-sequence current degree of unbalancedness mean value and the zero-sequence current degree of unbalancedness mean value of defluidization phase according to the current average of each phase before the said defluidization;
Judge that whether said negative-sequence current degree of unbalancedness mean value is greater than first predetermined threshold value; Or whether said zero-sequence current degree of unbalancedness mean value is greater than second predetermined threshold value; If; The not electric current of defluidization phase and phase differential when obtaining defluidization; During according to the current average of each phase before the said defluidization, said defluidization not the electric current of defluidization phase and phase differential confirm the forward-order current of defluidization phase not and the not forward-order current of defluidization phase and the phase differential between the voltage, according to the forward-order current of said not defluidization phase with the forward-order current and the phase differential between the voltage of defluidization phase do not confirm that defluidization moves back the benefit electric weight.
Move back the method for mending electric weight during above-mentioned online definite three-phase and four-line two phase defluidizations, through relatively negative-sequence current degree of unbalancedness mean value is big or small with zero-sequence current degree of unbalancedness mean value and predetermined threshold value respectively, the situation that degree of unbalancedness is bigger; The utilization forward-order current is confirmed positive sequence active power; Obtain correct power, move back the accuracy rate of mending electric weight thereby improved defluidization, clear and definite user's actual needs moves back the electric weight of benefit; The accuracy that definite user makes power consumption, the actual power consumption of clear and definite user have also been improved simultaneously.
Move back during a kind of online definite three-phase and four-line two phase defluidizations and mend the electric weight device, comprising:
Measurement module is used to obtain the electric current of each phase before the defluidization;
Detection module; Whether be used to detect defluidization; If, confirm the current average of each phase before the defluidization according to the electric current of each phase before the defluidization, confirm before the defluidization not the negative-sequence current degree of unbalancedness mean value and the zero-sequence current degree of unbalancedness mean value of defluidization phase according to the current average of each phase before the said defluidization;
Metering module; Whether be used for working as said negative-sequence current degree of unbalancedness mean value greater than first predetermined threshold value; Or whether said zero-sequence current degree of unbalancedness mean value is greater than second predetermined threshold value; If; The not electric current of defluidization phase and phase differential when obtaining defluidization, during according to the current average of each phase before the said defluidization, said defluidization not the electric current of defluidization phase and phase differential confirm the forward-order current of defluidization phase not and the not forward-order current of defluidization phase and the phase differential between the voltage, according to the forward-order current of said not defluidization phase with the forward-order current and the phase differential between the voltage of defluidization phase do not confirm that defluidization moves back the benefit electric weight.
Move back during above-mentioned online definite three-phase and four-line two phase defluidizations and mend the electric weight device; Relatively negative-sequence current degree of unbalancedness mean value and zero-sequence current degree of unbalancedness mean value and predetermined threshold value are big or small respectively through metering module; The situation that degree of unbalancedness is bigger, the utilization forward-order current is confirmed positive sequence active power, obtains correct power; Thereby improved defluidization and moved back the accuracy rate of mending electric weight; Clear and definite user's actual needs moves back the electric weight of benefit, has also improved the accuracy rate that definite user makes power consumption, the actual power consumption of clear and definite user simultaneously.
Description of drawings
Fig. 1 moves back the schematic flow sheet of the method embodiment one that mends electric weight during for the online definite three-phase and four-line two phase defluidizations of the present invention;
Fig. 2 moves back the method for mending electric weight during for the online definite three-phase and four-line two phase defluidizations of the present invention when A phase and the B principle schematic during defluidization mutually;
Fig. 3 moves back the schematic flow sheet of the method embodiment two that mends electric weight during for the online definite three-phase and four-line two phase defluidizations of the present invention;
Fig. 4 moves back the principle schematic before the method defluidization of mending electric weight during for the online definite three-phase and four-line two phase defluidizations of the present invention;
Fig. 5 moves back the structural representation of mending electric weight device embodiment one during for the online definite three-phase and four-line two phase defluidizations of the present invention;
Fig. 6 moves back the structural representation of mending electric weight device embodiment two during for the online definite three-phase and four-line two phase defluidizations of the present invention.
Embodiment
The present invention program wants and can under the situation of three-phase and four-line electric energy meter defluidization, improve and move back the accuracy of mending electric weight, for this reason; The present invention is through judging negative-sequence current degree of unbalancedness mean value and zero-sequence current degree of unbalancedness mean value; When needing only one of them degree of unbalancedness greater than predetermined threshold value, the utilization forward-order current is confirmed positive sequence active power, obtains correct power; Improved defluidization and moved back the accuracy of mending electric weight, thereby clear and definite user's actual needs moves back the electric weight of benefit.Be elaborated below in conjunction with each embodiment.
Moving back each embodiment of method that mends electric weight during at first to online definite three-phase and four-line two phase defluidizations describes.
Embodiment one
Referring to shown in Figure 1, move back the schematic flow sheet of the method embodiment one that mends electric weight when being the online definite three-phase and four-line two phase defluidizations of the present invention, comprise step:
Step S101: the electric current that obtains preceding each phase of defluidization;
Step S102: whether detect defluidization, if get into step S103;
Step S103: confirm the current average of each phase before the defluidization according to the electric current of each phase before the defluidization, confirm before the defluidization not the negative-sequence current degree of unbalancedness mean value and the zero-sequence current degree of unbalancedness mean value of defluidization phase according to the current average of each phase before the said defluidization;
Step S104: whether judge said negative-sequence current degree of unbalancedness mean value smaller or equal to first predetermined threshold value, and whether zero-sequence current degree of unbalancedness mean value if not, gets into step S105 smaller or equal to second predetermined threshold value;
Step S105: the not electric current of defluidization phase and phase differential when obtaining defluidization; During according to the current average of each phase before the said defluidization, said defluidization not the electric current of defluidization phase and phase differential confirm the forward-order current of defluidization phase not and the not forward-order current of defluidization phase and the phase differential between the voltage, according to the forward-order current of said not defluidization phase with the forward-order current and the phase differential between the voltage of defluidization phase do not confirm that defluidization moves back the benefit electric weight.
Referring to Fig. 2, move back during for the online definite three-phase and four-line two phase defluidizations of the present invention the method for mending electric weight when A mutually with the B principle schematic during defluidization mutually, below with the A phase when identical with B defluidization be that example is specifically introduced:
Before A, the B phase defluidization, (as 15 minutes) obtain A phase current, B phase current and C phase current one time at regular intervals, keep defluidization data for the previous period, such as being set to keep defluidization A the last week phase current, B phase current and C phase current data.Detect whether defluidization takes place, if then confirm preceding negative-sequence current degree of unbalancedness mean value of defluidization and zero-sequence current degree of unbalancedness mean value.Can occur unusually for fear of electric current is too little, can remove the three-phase current of maximum phase current less than 5%Ib.Confirm that degree of unbalancedness mean value concrete steps are following:
Confirm defluidization interior A the last week, B, C phase current mean value
Figure BDA00002006284700041
By formula
Figure BDA00002006284700042
Figure BDA00002006284700044
Can get In the formula
Figure BDA00002006284700046
Zero sequence current average before the expression defluidization,
Figure BDA00002006284700047
C phase forward-order current mean value before the expression defluidization,
Figure BDA00002006284700048
C phase negative-sequence current mean value before the expression defluidization, a is an operator, 120 ° of a=∠ represent that this phasor is rotated counterclockwise 120 °, a 2240 ° of=∠ represent that this phasor is rotated counterclockwise 240 °.
Before can getting defluidization by
Figure BDA00002006284700049
and
Figure BDA000020062847000410
, three-phase current negative-sequence current degree of unbalancedness mean value
Figure BDA000020062847000411
Zero-sequence current degree of unbalancedness mean value
Figure BDA00002006284700051
When three-phase current negative-sequence current degree of unbalancedness mean value greater than first predetermined threshold value, or zero-sequence current degree of unbalancedness mean value is that example is introduced with A, B phase defluidization during greater than second predetermined threshold value.Wherein, first predetermined threshold value and second predetermined threshold value can be set as required, such as being made as 2%.
When A, B phase defluidization, obtain A phase voltage U A0, A phase current I ' A, the phase difference of A phase voltage and electric current AB phase voltage U B0, B phase current I B, the phase difference of B phase voltage and electric current BC phase voltage U C0, C phase current I C, the phase difference of C phase voltage and electric current C
Because defluidization three-phase current imbalance degree mean value can not influence the unbalancedness of three-phase current in the electric system actual motion greater than predetermined threshold value behind the defluidization, promptly the three-phase current unbalance degree still can be bigger behind the defluidization, directly uses I CConfirm that correct power error is bigger.
Three phases active power is made up of positive sequence active power and negative phase-sequence active power, because the relative positive sequence active power of negative phase-sequence active power of electric system reality is less, can ignore during calculating, so can use positive sequence active power to replace correct active power.With C phase forward-order current
Figure BDA00002006284700052
With the C phase difference of forward-order current and voltage mutually C1Confirm correct positive sequence active power:
P 1＝3×U C0×I C1×COS(φ C1)
P≈P 1
Wherein: P 1For using
Figure BDA00002006284700053
The correct positive sequence active power of confirming, P is correct power,
Figure BDA00002006284700054
When being A, B phase defluidization
Figure BDA00002006284700055
Positive-sequence component, φ C1The phase differential of C phase line voltage and C phase current when being A, B phase defluidization.
Wherein, confirm C phase forward-order current With the C phase difference of forward-order current and voltage mutually C1Concrete steps following:
Before A, the B phase current defluidization, can get two leg-of-mutton six interior angles that four electric currents are formed by C phase current mean value
Figure BDA00002006284700057
C phase current forward-order current mean value
Figure BDA00002006284700058
C phase current negative-sequence current mean value
Figure BDA00002006284700059
C phase current zero-sequence current mean value
Figure BDA000020062847000510
.In quality of balance one regularly, two leg-of-mutton six interior angles being made up of
Figure BDA000020062847000511
and
Figure BDA000020062847000512
are constant.Forward-order current mean value, negative-sequence current mean value, zero-sequence current mean value, the current average of C phase current calculate six interior angles being made up of
Figure BDA000020062847000513
behind six interior angles (being phase differential) replacement defluidization of these four electric currents compositions before the then available defluidization.
Before A, the B phase defluidization, can get by
Figure BDA00002006284700061
and
Figure BDA00002006284700062
:
Figure BDA00002006284700063
Figure BDA00002006284700064
In the formula, δ representes
Figure BDA00002006284700065
With
Figure BDA00002006284700066
Phase differential, δ 0Expression
Figure BDA00002006284700067
With
Figure BDA00002006284700068
Phase differential, δ 1Expression
Figure BDA00002006284700069
With Phase differential, δ 2Expression
Figure BDA000020062847000611
With
Figure BDA000020062847000612
Phase differential, δ 3Expression
Figure BDA000020062847000613
With Phase differential, δ 4Expression
Figure BDA000020062847000615
With
Figure BDA000020062847000616
Phase differential.
Before defluidization
Figure BDA000020062847000617
With When six interior angles forming are replaced defluidizations
Figure BDA000020062847000619
Figure BDA000020062847000620
C phase current when six interior angles forming and defluidization The forward-order current of C phase when confirming defluidization
Figure BDA000020062847000622
With the C phase difference of forward-order current and C phase voltage mutually C1, can get:
I C 1 = I C - I C 0 - I C 2 = ( 1 - sin δ 0 sin δ ) ( 1 + sin δ 2 sin δ 1 ) I C
φ C1＝δ 0+δ 2+φ C
Thereby obtain correct positive sequence active power P 1
Fault active power is during defluidization:
P′＝U A0×I′ A×COS(φ′ A)+U B0×I′ B×COS(φ′ B)+U C0×I C×COS(φ C)
Difference power is:
ΔP＝P-P′
Difference power multiply by to add up at interval computing time again should move back the benefit electric weight during being whole defluidization:
W = Σ 0 T ΔP × Δt
Δ t is the time interval of each rated output difference in the formula, and T is the time during the whole defluidization.
After confirming to move back the benefit electric weight, can also move back according to defluidization and mend electric weight and the summation of actual measurement electric weight, correct electric weight when confirming defluidization.Therefore, improve and move back when mending the electric weight accuracy rate, also improved the accuracy rate of actual power consumption.
Because defluidization three-phase electric current is a mean value; So six interior angles that
Figure BDA000020062847000625
and
Figure BDA000020062847000626
forms also are a mean value; that obtained by six interior angles is a mean value; Then correct power is mean value, and electric weight also is a mean value thereby defluidization moves back benefit.Certainly; Also can ask two triangle variation ranges of C phase current, C phase current forward-order current, C phase current negative-sequence current, zero-sequence current composition with the A phase before the defluidization, B phase and C phase current variation range; The possible scope of correct power when obtaining defluidization is again moved back the benefit electric weight in a scope thereby obtain defluidization.
A, B phase defluidization A, B phase defluidization
When B, C mutually or when A, C phase defluidization, decompression is moved back the benefit electric weight when confirming defluidization, concrete grammar and A, B are similar during defluidization mutually, repeat no more at this.
Embodiment two
Referring to shown in Figure 3, move back the schematic flow sheet of the method embodiment two that mends electric weight when being the online definite three-phase and four-line two phase defluidizations of the present invention, comprise step:
Step S301: the electric current that obtains preceding each phase of defluidization;
Step S302: whether detect defluidization, if get into step S303;
Step S303: confirm the current average of each phase before the defluidization according to the electric current of each phase before the defluidization, confirm before the defluidization not the negative-sequence current degree of unbalancedness mean value and the zero-sequence current degree of unbalancedness mean value of defluidization phase according to the current average of each phase before the defluidization;
Step S304: whether judge negative-sequence current degree of unbalancedness mean value smaller or equal to first predetermined threshold value, and whether zero-sequence current degree of unbalancedness mean value is smaller or equal to second predetermined threshold value, if not, gets into step S305, if get into step S306;
Step S305: the not electric current of defluidization phase and phase differential when obtaining defluidization; During according to the current average of each phase before the defluidization, defluidization not the electric current of defluidization phase and phase differential confirm the forward-order current of defluidization phase not and the not forward-order current of defluidization phase and the phase differential between the voltage, according to the forward-order current of defluidization phase not with the forward-order current and the phase differential between the voltage of defluidization phase do not confirm that defluidization moves back the benefit electric weight;
Step S306: the electric current of each phase, voltage and phase differential when obtaining defluidization, electric current, voltage and the phase differential of each phase confirms that defluidization moves back the benefit electric weight when obtaining defluidization.
Below be that example is specifically introduced with A, B phase defluidization:
Before A, the B phase defluidization, (as 15 minutes) obtain A phase current, B phase current and C phase current one time at regular intervals, keep defluidization data for the previous period, such as being set to keep defluidization A the last week phase current, B phase current and C phase current data.Detect whether defluidization takes place, if then confirm preceding negative-sequence current degree of unbalancedness mean value of defluidization and zero-sequence current degree of unbalancedness mean value.Can occur unusually for fear of electric current is too little, can remove the three-phase current of maximum phase current less than 5%Ib.Confirm that degree of unbalancedness mean value concrete steps are following:
Confirm defluidization interior A the last week, B, C phase current mean value
Figure BDA00002006284700081
By formula
Figure BDA00002006284700082
Can get
Figure BDA00002006284700085
With
Figure BDA00002006284700086
In the formula
Figure BDA00002006284700087
Zero sequence current average before the expression defluidization,
Figure BDA00002006284700088
C phase forward-order current mean value before the expression defluidization,
Figure BDA00002006284700089
C phase negative-sequence current mean value before the expression defluidization, a is an operator, 120 ° of a=∠ represent that this phasor is rotated counterclockwise 120 °, a 2240 ° of=∠ represent that this phasor is rotated counterclockwise 240 °.
Before can getting defluidization by
Figure BDA000020062847000810
and
Figure BDA000020062847000811
, three-phase current negative-sequence current degree of unbalancedness mean value
Figure BDA000020062847000812
Zero-sequence current degree of unbalancedness mean value
Figure BDA000020062847000813
When three-phase current negative-sequence current degree of unbalancedness mean value less than first predetermined threshold value, and zero-sequence current degree of unbalancedness mean value is during less than second predetermined threshold value, predetermined threshold value can be set as required, such as being made as 2%.Referring to Fig. 4, for the online definite three-phase and four-line two phase defluidizations of the present invention move back mend electric weight method A mutually with the B principle schematic before the defluidization mutually.
Owing to can not influence the unbalancedness of three-phase current in the electric system actual motion behind the defluidization; The three-phase current unbalance degree still can be very little behind the defluidization, can think that three-phase current is symmetrical, the three-phase current equal and opposite in direction; Phase differential between the three-phase current is 120 °; And the imbalance of three-phase voltage degree is very little in the electric system actual motion, can think that when confirming to move back the benefit electric weight three-phase voltage is symmetrical, C phase voltage U when obtaining A, B phase defluidization C0, C phase current I C, C phase voltage U C0With
Figure BDA00002006284700091
Phase differential Confirm that correct active power is:
P＝3×U C0×I C×COS(φ C)
In the formula: P representes correct active power, U C0C phase voltage during the expression defluidization, I CC phase current during the expression defluidization,
Figure BDA00002006284700093
Expression C phase voltage U C0With
Figure BDA00002006284700094
Phase differential, COS (φ C) be the three-phase load power factor.
Defluidization fault active power is:
P′＝U A0×I′ A×COS(φ′ A)+U B0×I′ B×COS(φ′ B)+U C0×I C×COS(φ C)
In the formula: U A0A phase voltage when expression A, B phase defluidization, I ' AA phase fault electric current when expression A, B phase defluidization,
Figure BDA00002006284700095
When expression A, B phase defluidization
Figure BDA00002006284700096
With
Figure BDA00002006284700097
Phase differential, U B0B phase voltage when expression A, B phase defluidization, I ' BExpression A, B phase defluidization B phase fault electric current, φ ' BB phase voltage during the expression defluidization
Figure BDA00002006284700098
With B phase current I ' BPhase differential, Uc 0C phase voltage when expression A, B phase defluidization, C phase current when Ic representes A, B phase defluidization,
Figure BDA00002006284700099
C phase voltage when expression A, B phase defluidization
Figure BDA000020062847000910
With the C phase current Phase differential.
Difference power is:
ΔP＝P-P′
Difference power multiply by confirms that the time interval adds up again and should move back the benefit electric weight during being whole decompression:
W = Σ 0 T ΔP × Δt
Δ t is each time interval of confirming difference power in the formula, and T is the time during the whole decompression;
After confirming to move back the benefit electric weight, can also move back according to defluidization and mend electric weight and the summation of actual measurement electric weight, correct electric weight when confirming defluidization.Therefore, improve and move back when mending the electric weight accuracy rate, also improved the accuracy rate of actual power consumption.
When three-phase current negative-sequence current degree of unbalancedness mean value more than or equal to first predetermined threshold value, or zero-sequence current degree of unbalancedness mean value is that example is introduced with A, B phase defluidization during more than or equal to second predetermined threshold value.Wherein, it is to set as required that first predetermined threshold value and second defaults in, such as being made as 2%.Referring to Fig. 2, move back the principle schematic of method when A, B phase defluidization of mending electric weight for the online definite three-phase and four-line two phase defluidizations of the present invention.
When A, B phase defluidization, obtain A phase voltage U A0, A phase current I ' A, the phase difference of A phase voltage and electric current AB phase voltage U B0, B phase current I B, the phase difference of B phase voltage and electric current BC phase voltage U C0, C phase current I C, the phase difference of C phase voltage and electric current C
Because defluidization three-phase current imbalance degree mean value can not influence the unbalancedness of three-phase current in the electric system actual motion greater than predetermined threshold value behind the defluidization, promptly the three-phase current unbalance degree still can be bigger behind the defluidization, uses I CConfirm that correct power error is bigger.
Three phases active power is made up of positive sequence active power and negative phase-sequence active power, because the relative positive sequence active power of negative phase-sequence active power of electric system reality is less, can ignore during calculating, so can use positive sequence active power to replace correct active power.With C phase forward-order current
Figure BDA00002006284700101
With the C phase difference of forward-order current and voltage mutually C1Confirm correct positive sequence active power:
P 1＝3×U C0×I C1×COS(φ C1)
P≈P 1
Wherein: P 1For using
Figure BDA00002006284700102
The correct positive sequence active power of confirming, P is correct power,
Figure BDA00002006284700103
When being A, B phase defluidization
Figure BDA00002006284700104
Positive-sequence component, φ C1The phase differential of C phase line voltage and C phase current when being A, B phase defluidization.
Wherein, confirm C phase forward-order current With the C phase difference of forward-order current and voltage mutually C1Concrete steps following:
Before A, the B phase current defluidization, can get two leg-of-mutton six interior angles that four electric currents are formed by C phase current mean value
Figure BDA00002006284700106
, C phase current forward-order current mean value
Figure BDA00002006284700107
C phase current negative-sequence current mean value C phase current zero-sequence current mean value
Figure BDA00002006284700109
.In quality of balance one regularly, two leg-of-mutton six interior angles being made up of
Figure BDA000020062847001010
and
Figure BDA000020062847001011
are constant.Forward-order current mean value, negative-sequence current mean value, zero-sequence current mean value, the current average of C phase current calculate six interior angles being made up of
Figure BDA000020062847001012
behind six interior angles (being phase differential) replacement defluidization of these four electric currents compositions before the then available defluidization.
Before A, the B phase defluidization, can get by
Figure BDA000020062847001013
and
Figure BDA000020062847001014
:
In the formula, δ representes
Figure BDA000020062847001017
With
Figure BDA000020062847001018
Phase differential, δ 0Expression
Figure BDA000020062847001019
With Phase differential, δ 1Expression
Figure BDA000020062847001021
With
Figure BDA000020062847001022
Phase differential, δ 2Expression
Figure BDA000020062847001023
With
Figure BDA000020062847001024
Phase differential, δ 3Expression
Figure BDA000020062847001025
With
Figure BDA000020062847001026
Phase differential, δ 4Expression
Figure BDA000020062847001027
With
Figure BDA000020062847001028
Phase differential.
Before defluidization With
Figure BDA000020062847001030
When six interior angles forming are replaced defluidizations
Figure BDA000020062847001031
Figure BDA00002006284700111
C phase current when six interior angles forming and defluidization The forward-order current of C phase when confirming defluidization
Figure BDA00002006284700113
With the C phase difference of forward-order current and C phase voltage mutually C1, can get:
I C 1 = I C - I C 0 - I C 2 = ( 1 - sin δ 0 sin δ ) ( 1 + sin δ 2 sin δ 1 ) I C
φ C1＝δ 0+δ 2+φ C
Thereby obtain correct positive sequence active power P 1
Fault active power is during defluidization:
P′＝U A0×I′ A×COS(φ′ A)+U B0×I′ B×COS(φ′ B)+U C0×I C×COS(φ C)
Difference power is:
ΔP＝P-P′
Difference power multiply by to add up at interval computing time again should move back the benefit electric weight during being whole defluidization:
W = Σ 0 T ΔP × Δt
Δ t is the time interval of each rated output difference in the formula, and T is the time during the whole defluidization.
After confirming to move back the benefit electric weight, can also move back according to defluidization and mend electric weight and the summation of actual measurement electric weight, correct electric weight when confirming defluidization.Therefore, improve and move back when mending the electric weight accuracy rate, also improved the accuracy rate of actual power consumption.
Because defluidization three-phase electric current is a mean value; So six interior angles that
Figure BDA00002006284700116
and
Figure BDA00002006284700117
forms also are a mean value;
Figure BDA00002006284700118
that obtained by six interior angles is a mean value; Then correct power is mean value, and electric weight also is a mean value thereby defluidization moves back benefit.Certainly; Also can ask two triangle variation ranges of C phase current, C phase current forward-order current, C phase current negative-sequence current, zero-sequence current composition with the A phase before the defluidization, B phase and C phase current variation range; The possible scope of correct power when obtaining defluidization is again moved back the benefit electric weight in a scope thereby obtain defluidization.
A, B phase defluidization A, B phase defluidization
When B, C mutually or when A, C phase defluidization, decompression is moved back the benefit electric weight when confirming defluidization, concrete grammar and A, B are similar during defluidization mutually, repeat no more at this.
Move back the method for mending electric weight during according to the online definite three-phase and four-line two phase defluidizations of the invention described above, the present invention moves back when a kind of online definite three-phase and four-line two phase defluidizations are provided and mends the electric weight device, is elaborated with regard to specific embodiment below:
Embodiment one
Referring to Fig. 5, move back the structural representation of mending electric weight device embodiment one when being the online definite three-phase and four-line two phase defluidizations of the present invention, comprising:
Measurement module 501 is used to obtain the electric current of each phase before the defluidization;
Detection module 502; Be used to judge whether defluidization; If, confirm the current average of each phase before the defluidization according to the electric current of each phase before the defluidization, confirm before the defluidization not the negative-sequence current degree of unbalancedness mean value and the zero-sequence current degree of unbalancedness mean value of defluidization phase according to the current average of each phase before the defluidization;
Metering module 503; Whether be used for working as negative-sequence current degree of unbalancedness mean value smaller or equal to first predetermined threshold value; And whether zero-sequence current degree of unbalancedness mean value is during smaller or equal to second predetermined threshold value; The not electric current of defluidization phase and phase differential when obtaining defluidization; During according to the current average of each phase before the defluidization, defluidization not the electric current of defluidization phase and phase differential confirm the forward-order current of defluidization phase not and the not forward-order current of defluidization phase and the phase differential between the voltage, according to the forward-order current of said not defluidization phase with the forward-order current and the phase differential between the voltage of defluidization phase do not confirm that defluidization moves back the benefit electric weight.
Referring to Fig. 2, below be that example is specifically introduced with A, B phase defluidization:
Before A, the B phase defluidization; Measurement module 501 (as 15 minutes) at regular intervals obtains A phase current, B phase current and C phase current one time; Keep defluidization data for the previous period, such as being set to keep defluidization A the last week phase current, B phase current and C phase current data.Detection module 502 detects whether defluidization takes place, if then confirm preceding negative-sequence current degree of unbalancedness mean value of defluidization and zero-sequence current degree of unbalancedness mean value.Can occur unusually for fear of electric current is too little, can remove the three-phase current of maximum phase current less than 5%Ib.Confirm that degree of unbalancedness mean value concrete steps are following:
Confirm defluidization interior A the last week, B, C phase current mean value
By formula
Figure BDA00002006284700122
Figure BDA00002006284700123
Figure BDA00002006284700131
Can get
Figure BDA00002006284700132
With
Figure BDA00002006284700133
In the formula Zero sequence current average before the expression defluidization, C phase forward-order current mean value before the expression defluidization,
Figure BDA00002006284700136
C phase negative-sequence current mean value before the expression defluidization, a is an operator, 120 ° of a=∠ represent that this phasor is rotated counterclockwise 120 °, a 2240 ° of=∠ represent that this phasor is rotated counterclockwise 240 °.
Before can getting defluidization by
Figure BDA00002006284700137
and
Figure BDA00002006284700138
, three-phase current negative-sequence current degree of unbalancedness mean value
Figure BDA00002006284700139
Zero-sequence current degree of unbalancedness mean value
Figure BDA000020062847001310
When three-phase current negative-sequence current degree of unbalancedness mean value greater than first predetermined threshold value, or zero-sequence current degree of unbalancedness mean value is that example is introduced with A, B phase defluidization during greater than second predetermined threshold value.Wherein, first predetermined threshold value and second predetermined threshold value can be set as required, such as being made as 2%.
When A, B phase defluidization, metering module 503 obtains A phase voltage U A0, A phase current I ' A, the phase difference of A phase voltage and electric current AB phase voltage U B0, B phase current I B, the phase difference of B phase voltage and electric current BC phase voltage U C0, C phase current I C, the phase difference of C phase voltage and electric current C
Because defluidization three-phase current imbalance degree mean value can not influence the unbalancedness of three-phase current in the electric system actual motion greater than predetermined threshold value behind the defluidization, promptly the three-phase current unbalance degree still can be bigger behind the defluidization, directly uses I CConfirm that correct power error is bigger.
Three phases active power is made up of positive sequence active power and negative phase-sequence active power, because the relative positive sequence active power of negative phase-sequence active power of electric system reality is less, can ignore during calculating, so metering module 503 usefulness positive sequence active power replace correct active power.With C phase forward-order current
Figure BDA000020062847001311
With the C phase difference of forward-order current and voltage mutually C1Confirm correct positive sequence active power:
P 1＝3×U C0×I C1×COS(φ C1)
P≈P 1
Wherein: P 1For using
Figure BDA000020062847001312
The correct positive sequence active power of confirming, P is correct power,
Figure BDA000020062847001313
When being A, B phase defluidization
Figure BDA000020062847001314
Positive-sequence component, φ C1The phase differential of C phase line voltage and C phase current when being A, B phase defluidization.
Wherein, confirm C phase forward-order current
Figure BDA00002006284700141
With the C phase difference of forward-order current and voltage mutually C1Concrete steps following:
Before A, the B phase current defluidization, can get two leg-of-mutton six interior angles that four electric currents are formed by C phase current mean value
Figure BDA00002006284700142
C phase current forward-order current mean value C phase current negative-sequence current mean value
Figure BDA00002006284700144
C phase current zero-sequence current mean value
Figure BDA00002006284700145
.In quality of balance one regularly, two leg-of-mutton six interior angles being made up of
Figure BDA00002006284700146
and are constant.Forward-order current mean value, negative-sequence current mean value, zero-sequence current mean value, the current average of C phase current calculate six interior angles being made up of
Figure BDA00002006284700148
behind six interior angles (being phase differential) replacement defluidization of these four electric currents compositions before the then available defluidization.
Before A, the B phase defluidization, can get by
Figure BDA00002006284700149
and
Figure BDA000020062847001410
:
Figure BDA000020062847001411
In the formula, δ representes
Figure BDA000020062847001413
With
Figure BDA000020062847001414
Phase differential, δ 0Expression
Figure BDA000020062847001415
With
Figure BDA000020062847001416
Phase differential, δ 1Expression
Figure BDA000020062847001417
With
Figure BDA000020062847001418
Phase differential, δ 2Expression
Figure BDA000020062847001419
With
Figure BDA000020062847001420
Phase differential, δ 3Expression
Figure BDA000020062847001421
With
Figure BDA000020062847001422
Phase differential, δ 4Expression
Figure BDA000020062847001423
With
Figure BDA000020062847001424
Phase differential.
Metering module 503 is according to before the defluidization
Figure BDA000020062847001425
With
Figure BDA000020062847001426
When six interior angles forming are replaced defluidizations C phase current when six interior angles forming and defluidization
Figure BDA000020062847001428
The forward-order current of C phase when confirming defluidization
Figure BDA000020062847001429
With the C phase difference of forward-order current and C phase voltage mutually C1, can get:
I C 1 = I C - I C 0 - I C 2 = ( 1 - sin δ 0 sin δ ) ( 1 + sin δ 2 sin δ 1 ) I C
φ C1＝δ 0+δ 2+φ C
Thereby obtain correct positive sequence active power P 1
Fault active power is during defluidization:
Figure BDA000020062847001431
Difference power is:
ΔP＝P-P′
Metering module 503 multiply by difference power to add up at interval computing time again and should move back the benefit electric weight during being whole defluidization:
W = Σ 0 T ΔP × Δt
Δ t is the time interval of each rated output difference in the formula, and T is the time during the whole defluidization.
After metering module 503 confirms to move back the benefit electric weight, can also move back according to defluidization and mend electric weight and the summation of actual measurement electric weight, correct electric weight when confirming defluidization.Therefore, improve and move back when mending the electric weight accuracy rate, also improved the accuracy rate of actual power consumption.
Because defluidization three-phase electric current is a mean value; So six interior angles that
Figure BDA00002006284700152
and
Figure BDA00002006284700153
forms also are a mean value;
Figure BDA00002006284700154
that obtained by six interior angles is a mean value; Then correct power is mean value, and electric weight also is a mean value thereby defluidization moves back benefit.Certainly; Also can ask two triangle variation ranges of C phase current, C phase current forward-order current, C phase current negative-sequence current, zero-sequence current composition with the A phase before the defluidization, B phase and C phase current variation range; The possible scope of correct power when obtaining defluidization is again moved back the benefit electric weight in a scope thereby obtain defluidization.
This device also can be used for when B, C mutually or when A, C phase defluidization, decompression is moved back the benefit electric weight when confirming defluidization, concrete grammar and A, B are similar during defluidization mutually, repeat no more at this.
Embodiment two
Referring to Fig. 6, move back the structural representation of mending electric weight device embodiment two when being the online definite three-phase and four-line two phase defluidizations of the present invention, comprising:
Measurement module 601 is used to obtain the electric current of each phase before the defluidization;
The detection module 602 that is connected with measurement module 601; Be used to judge whether defluidization; If; Then confirm the current average of each phase before the defluidization, confirm before the defluidization not the negative-sequence current degree of unbalancedness mean value and the zero-sequence current degree of unbalancedness mean value of defluidization phase according to the current average of each phase before the said defluidization according to the electric current of each phase before the defluidization;
The judge module 603 that is connected with second metering module with metering module; Whether be used for negative-sequence current degree of unbalancedness mean value smaller or equal to first predetermined threshold value; And whether said zero-sequence current degree of unbalancedness mean value if not, then selects first metering module 604 smaller or equal to second predetermined threshold value; If then select second metering module 605;
Metering module 604; The not electric current of defluidization phase and phase differential when being used to obtain defluidization; During according to the current average of each phase before the said defluidization, said defluidization not the electric current of defluidization phase and phase differential confirm the forward-order current of defluidization phase not and the not forward-order current of defluidization phase and the phase differential between the voltage, according to the forward-order current of said not defluidization phase with the forward-order current and the phase differential between the voltage of defluidization phase do not confirm that defluidization moves back the benefit electric weight.
Second metering module 605, the electric current of each phase, voltage and phase differential when being used to obtain defluidization, according to said when obtaining defluidization electric current, voltage and the phase differential of each phase confirm that defluidization moves back the benefit electric weight.
Below be that example is specifically introduced with A, B phase defluidization:
Before A, the B phase defluidization, (as 15 minutes) obtain A phase current, B phase current and C phase current one time at regular intervals, keep defluidization data for the previous period, such as being set to keep defluidization A the last week phase current, B phase current and C phase current data.Detect whether defluidization takes place, if then confirm preceding negative-sequence current degree of unbalancedness mean value of defluidization and zero-sequence current degree of unbalancedness mean value.Can occur unusually for fear of electric current is too little, can remove the three-phase current of maximum phase current less than 5%Ib.Confirm that degree of unbalancedness mean value concrete steps are following:
Confirm defluidization interior A the last week, B, C phase current mean value
Figure BDA00002006284700161
By formula
Figure BDA00002006284700162
Can get
Figure BDA00002006284700165
With
Figure BDA00002006284700166
In the formula Zero sequence current average before the expression defluidization,
Figure BDA00002006284700168
C phase forward-order current mean value before the expression defluidization,
Figure BDA00002006284700169
C phase negative-sequence current mean value before the expression defluidization, a is an operator, 120 ° of a=∠ represent that this phasor is rotated counterclockwise 120 °, a 2240 ° of=∠ represent that this phasor is rotated counterclockwise 240 °.
Before can getting defluidization by
Figure BDA000020062847001610
and , three-phase current negative-sequence current degree of unbalancedness mean value
Figure BDA00002006284700171
Zero-sequence current degree of unbalancedness mean value
Figure BDA00002006284700172
When three-phase current negative-sequence current degree of unbalancedness mean value less than first predetermined threshold value, and zero-sequence current degree of unbalancedness mean value is during less than second predetermined threshold value, predetermined threshold value can be set as required, such as being made as 2%.Referring to Fig. 4, for the online definite three-phase and four-line two phase defluidizations of the present invention move back the method A that mends electric weight, the principle schematic before the B phase defluidization.
Owing to can not influence the unbalancedness of three-phase current in the electric system actual motion behind the defluidization; The three-phase current unbalance degree still can be very little behind the defluidization, can think that three-phase current is symmetrical, the three-phase current equal and opposite in direction; Phase differential between the three-phase current is 120 °; And the imbalance of three-phase voltage degree is very little in the electric system actual motion, can think that when confirming to move back the benefit electric weight three-phase voltage is symmetrical, C phase voltage U when obtaining A, B phase defluidization C0, C phase current I C, C phase voltage U C0With Phase differential
Figure BDA00002006284700174
Confirm that correct active power is:
P＝3×U C0×I C×COS(φ C)
In the formula: P representes correct active power, U C0C phase voltage during the expression defluidization, I CC phase current during the expression defluidization, Expression C phase voltage U C0With Phase differential, COS (φ C) be the three-phase load power factor.
Defluidization fault active power is:
P′＝U A0×I′ A×COS(φ′ A)+U B0×I′ B×COS(φ′ B)+U C0×I C×COS(φ C)
In the formula: U A0A phase voltage when expression A, B phase defluidization, I ' AA phase fault electric current when expression A, B phase defluidization,
Figure BDA00002006284700177
During the expression defluidization
Figure BDA00002006284700178
With Phase differential, U B0B phase voltage when expression A, B phase defluidization, I ' BB phase fault electric current when expression A, B phase defluidization, φ ' BB phase voltage when expression A, B phase defluidization
Figure BDA000020062847001710
With the B phase current
Figure BDA000020062847001711
Phase differential, Uc 0C phase voltage when expression A, B phase defluidization, C phase current when Ic representes A, B phase defluidization,
Figure BDA000020062847001712
C phase voltage during the expression defluidization
Figure BDA000020062847001713
With the C phase current
Figure BDA000020062847001714
Phase differential.
Difference power is:
ΔP＝P-P′
Difference power multiply by confirms that the time interval adds up again and should move back the benefit electric weight during being whole decompression:
W = Σ 0 T ΔP × Δt
Δ t is each time interval of confirming difference power in the formula, and T is the time during the whole decompression;
After confirming to move back the benefit electric weight, can also move back according to defluidization and mend electric weight and the summation of actual measurement electric weight, correct electric weight when confirming defluidization.Therefore, improve and move back when mending the electric weight accuracy rate, also improved the accuracy rate of actual power consumption.
When three-phase current negative-sequence current degree of unbalancedness mean value more than or equal to first predetermined threshold value, or zero-sequence current degree of unbalancedness mean value is that example is introduced with A, B phase defluidization during more than or equal to second predetermined threshold value.Wherein, it is to set as required that first predetermined threshold value and second defaults in, such as being made as 2%.Referring to Fig. 2, move back the principle schematic of method when A, B phase defluidization of mending electric weight for the online definite three-phase and four-line two phase defluidizations of the present invention.
When A, B phase defluidization, obtain A phase voltage U A0, A phase current I ' A, the phase difference of A phase voltage and electric current AB phase voltage U B0, B phase current I B, the phase difference of B phase voltage and electric current BC phase voltage U C0, C phase current I C, the phase difference of C phase voltage and electric current C
Because defluidization three-phase current imbalance degree mean value can not influence the unbalancedness of three-phase current in the electric system actual motion greater than predetermined threshold value behind the defluidization, promptly the three-phase current unbalance degree still can be bigger behind the defluidization, confirms that with IC correct power error is bigger.
Three phases active power is made up of positive sequence active power and negative phase-sequence active power, because the relative positive sequence active power of negative phase-sequence active power of electric system reality is less, can ignore during calculating, so can use positive sequence active power to replace correct active power.With C phase forward-order current
Figure BDA00002006284700182
With the C phase difference of forward-order current and voltage mutually C1Confirm correct positive sequence active power:
P 1＝3×U C0×I C1×COS(φ C1)
P≈P 1
Wherein: P 1For using
Figure BDA00002006284700183
The correct positive sequence active power of confirming, P is correct power,
Figure BDA00002006284700184
When being A, B phase defluidization
Figure BDA00002006284700185
Positive-sequence component, φ C1The phase differential of C phase line voltage and C phase current when being A, B phase defluidization.
Wherein, confirm C phase forward-order current
Figure BDA00002006284700186
With the C phase difference of forward-order current and voltage mutually C1Concrete steps following:
Before A, the B phase current defluidization, can get two leg-of-mutton six interior angles that four electric currents are formed by C phase current mean value
Figure BDA00002006284700187
C phase current forward-order current mean value
Figure BDA00002006284700188
C phase current negative-sequence current mean value
Figure BDA00002006284700189
C phase current zero-sequence current mean value
Figure BDA000020062847001810
.In quality of balance one regularly, two leg-of-mutton six interior angles being made up of
Figure BDA00002006284700191
and
Figure BDA00002006284700192
are constant.Forward-order current mean value, negative-sequence current mean value, zero-sequence current mean value, the current average of C phase current calculate six interior angles being made up of
Figure BDA00002006284700193
behind six interior angles (being phase differential) replacement defluidization of these four electric currents compositions before the then available defluidization.
Before A, the B phase defluidization, can get by
Figure BDA00002006284700194
and
Figure BDA00002006284700195
:
Figure BDA00002006284700196
In the formula, δ representes
Figure BDA00002006284700198
With Phase differential, δ 0Expression
Figure BDA000020062847001910
With Phase differential, δ 1Expression With
Figure BDA000020062847001913
Phase differential, δ 2Expression
Figure BDA000020062847001914
With
Figure BDA000020062847001915
Phase differential, δ 3Expression
Figure BDA000020062847001916
With
Figure BDA000020062847001917
Phase differential, δ 4Expression With Phase differential.
Before defluidization
Figure BDA000020062847001920
With When six interior angles forming are replaced defluidizations
Figure BDA000020062847001922
Figure BDA000020062847001923
C phase current when six interior angles forming and defluidization
Figure BDA000020062847001924
The forward-order current of C phase when confirming defluidization
Figure BDA000020062847001925
With the C phase difference of forward-order current and C phase voltage mutually C1, can get:
I C 1 = I C - I C 0 - I C 2 = ( 1 - sin δ 0 sin δ ) ( 1 + sin δ 2 sin δ 1 ) I C
φ C1＝δ 0+δ 2+φ C
Thereby obtain correct positive sequence active power P 1
Fault active power is during defluidization:
Figure BDA000020062847001927
Difference power is:
ΔP＝P-P′
Difference power multiply by to add up at interval computing time again should move back the benefit electric weight during being whole defluidization:
W = Σ 0 T ΔP × Δt
Δ t is the time interval of each rated output difference in the formula, and T is the time during the whole defluidization.
After confirming to move back the benefit electric weight, can also move back according to defluidization and mend electric weight and the summation of actual measurement electric weight, correct electric weight when confirming defluidization.Therefore, improve and move back when mending the electric weight accuracy rate, also improved the accuracy rate of actual power consumption.
Because defluidization three-phase electric current is a mean value; So six interior angles that
Figure BDA00002006284700201
and
Figure BDA00002006284700202
forms also are a mean value;
Figure BDA00002006284700203
that obtained by six interior angles is a mean value; Then correct power is mean value, and electric weight also is a mean value thereby defluidization moves back benefit.Certainly; Also can ask two triangle variation ranges of C phase current, C phase current forward-order current, C phase current negative-sequence current, zero-sequence current composition with the A phase before the defluidization, B phase and C phase current variation range; The possible scope of correct power when obtaining defluidization is again moved back the benefit electric weight in a scope thereby obtain defluidization.
This device also can be used for when B, C mutually or when A, C phase defluidization, decompression is moved back the benefit electric weight when confirming defluidization, concrete grammar and A, B are similar during defluidization mutually, repeat no more at this.
The above embodiment has only expressed several kinds of embodiments of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the present invention's design, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with accompanying claims.

Claims (9)

1. move back the method for mending electric weight during online definite three-phase and four-line two phase defluidizations, it is characterized in that, comprise step:
Obtain the electric current of preceding each phase of defluidization;
Whether detect defluidization; If; Confirm the current average of each phase before the defluidization according to the electric current of each phase before the defluidization, confirm before the defluidization not the negative-sequence current degree of unbalancedness mean value and the zero-sequence current degree of unbalancedness mean value of defluidization phase according to the current average of each phase before the said defluidization;
Judge that whether said negative-sequence current degree of unbalancedness mean value is greater than first predetermined threshold value; Or whether said zero-sequence current degree of unbalancedness mean value is greater than second predetermined threshold value; If; The not electric current of defluidization phase and phase differential when obtaining defluidization; During according to the current average of each phase before the said defluidization, said defluidization not the electric current of defluidization phase and phase differential confirm the forward-order current of defluidization phase not and the not forward-order current of defluidization phase and the phase differential between the voltage, according to the forward-order current of said not defluidization phase with the forward-order current and the phase differential between the voltage of defluidization phase do not confirm that defluidization moves back the benefit electric weight.
2. move back the method for mending electric weight during online definite three-phase and four-line two phase defluidizations according to claim 1, it is characterized in that, also comprise step: move back correct electric weight when mending electric weight and confirming defluidization according to said defluidization.
3. move back the method for mending electric weight during online definite three-phase and four-line two phase defluidizations according to claim 1, it is characterized in that, also comprise step:
When said negative-sequence current degree of unbalancedness mean value is less than or equal to first predetermined threshold value; And said zero-sequence current degree of unbalancedness mean value is during less than second predetermined threshold value; The electric current of each phase, voltage and phase differential when obtaining defluidization, according to said when obtaining defluidization electric current, voltage and the phase differential of each phase confirm that defluidization moves back the benefit electric weight.
4. move back the method for mending electric weight during online definite three-phase and four-line two phase defluidizations according to claim 3, it is characterized in that, also comprise step:
When said negative-sequence current degree of unbalancedness mean value is less than or equal to first predetermined threshold value, and said zero-sequence current degree of unbalancedness mean value is during less than second predetermined threshold value, moves back correct electric weight when mending electric weight and confirming defluidization according to said defluidization.
5. move back the method for mending electric weight during according to claim 1 or 2 or 3 or 4 described online definite three-phase and four-line two phase defluidizations; It is characterized in that; Whether said negative-sequence current degree of unbalancedness mean value is greater than first predetermined threshold value; Or whether said zero-sequence current degree of unbalancedness mean value confirms defluidization move back benefit electric weight, comprise employing formula greater than second predetermined threshold value
P＝3×U×I×COS(φ)
Correct active power when confirming defluidization, in the formula, defluidization phase voltage not when U representes defluidization, defluidization phase forward-order current not when I representes defluidization, the phase differential between defluidization phase forward-order current and the voltage not when φ representes defluidization.
6. move back the method for mending electric weight during according to claim 1 or 2 or 3 or 4 described online definite three-phase and four-line two phase defluidizations, it is characterized in that, said confirm the forward-order current of defluidization phase not and not the forward-order current of defluidization phase and the phase differential between the voltage comprise step:
Confirm before the defluidization not forward-order current mean value, negative-sequence current mean value and the zero-sequence current mean value of defluidization phase according to the current average of each phase before the said defluidization;
According to defluidization phase current mean value, forward-order current mean value, negative-sequence current mean value and zero-sequence current mean value are not confirmed before the defluidization the not phase differential between defluidization phase current mean value, forward-order current mean value, negative-sequence current mean value, the zero-sequence current mean value before the defluidization;
The forward-order current of defluidization phase not when defluidization electric current is not mutually confirmed defluidization when the phase differential between defluidization phase current mean value, forward-order current mean value, negative-sequence current mean value, the zero-sequence current mean value is not with defluidization before the defluidization, defluidization forward-order current and the phase differential between the voltage mutually not when the defluidization phase current is not confirmed defluidization with the phase differential between the voltage when phase differential between defluidization phase current mean value, forward-order current mean value, negative-sequence current mean value, the zero-sequence current mean value and defluidization before the defluidization.
7. move back during online definite three-phase and four-line two phase defluidizations and mend the electric weight device, it is characterized in that, comprising:
Measurement module is used to obtain the electric current of each phase before the defluidization;
Detection module; Whether be used to detect defluidization; If, confirm the current average of each phase before the defluidization according to the electric current of each phase before the defluidization, confirm before the defluidization not the negative-sequence current degree of unbalancedness mean value and the zero-sequence current degree of unbalancedness mean value of defluidization phase according to the current average of each phase before the said defluidization;
Metering module; Whether be used for working as said negative-sequence current degree of unbalancedness mean value greater than first predetermined threshold value; Or whether said zero-sequence current degree of unbalancedness mean value is greater than second predetermined threshold value; If; The not electric current of defluidization phase and phase differential when obtaining defluidization, during according to the current average of each phase before the said defluidization, said defluidization not the electric current of defluidization phase and phase differential confirm the forward-order current of defluidization phase not and the not forward-order current of defluidization phase and the phase differential between the voltage, according to the forward-order current of said not defluidization phase with the forward-order current and the phase differential between the voltage of defluidization phase do not confirm that defluidization moves back the benefit electric weight.
8. move back during online definite three-phase and four-line two phase defluidizations according to claim 7 and mend the electric weight device, it is characterized in that, also comprise:
Second metering module; Be used for being less than or equal to first predetermined threshold value when said negative-sequence current degree of unbalancedness mean value; And said zero-sequence current degree of unbalancedness mean value is during less than second predetermined threshold value; The electric current of each phase, voltage and phase differential when obtaining defluidization, according to said when obtaining defluidization electric current, voltage and the phase differential of each phase confirm that defluidization moves back the benefit electric weight;
The judge module that is connected with second metering module with metering module; Be used to judge whether said negative-sequence current degree of unbalancedness mean value is less than or equal to first predetermined threshold value; And whether said zero-sequence current degree of unbalancedness mean value if not, then selects metering module less than second predetermined threshold value; If then select second metering module.
9. move back during online definite three-phase and four-line two phase defluidizations according to claim 8 and mend the electric weight device, it is characterized in that,
Said metering module also is used for, and moves back correct electric weight when mending electric weight and confirming defluidization according to said defluidization;
Said second metering module also is used for, and moves back correct electric weight when mending electric weight and confirming defluidization according to said defluidization.
CN201210287760.6A 2012-08-13 2012-08-13 Method and device for on-line determining withdrawal and compensation electric quantity in three-phase four-wire two-phase current loss Active CN102768301B (en)

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