CN107482655B - A kind of optimization has a grade capacitor and inductor combination switching to adjust threephase load unbalanced method - Google Patents
A kind of optimization has a grade capacitor and inductor combination switching to adjust threephase load unbalanced method Download PDFInfo
- Publication number
- CN107482655B CN107482655B CN201710757611.4A CN201710757611A CN107482655B CN 107482655 B CN107482655 B CN 107482655B CN 201710757611 A CN201710757611 A CN 201710757611A CN 107482655 B CN107482655 B CN 107482655B
- Authority
- CN
- China
- Prior art keywords
- capacitance
- switching
- phase
- value
- phases
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Landscapes
- Control Of Electrical Variables (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
Abstract
The invention discloses a kind of optimizations to have a grade capacitor and inductor combination switching to adjust threephase load unbalanced method, limited group of number of connection configuration does not wait capacities between this method is included in phase line, limited group of number of connection configuration does not wait capacities or inductance between phase line and zero curve, when carrying out the adjusting of threephase load imbalance, according to the power grid three-phase voltage of Site Detection, electric current and power factor data, calculate realize threephase load balance adjustment when each phase line between and the capacitance switching numerical value between each phase line and zero curve, then, according to the current switching state of each group capacitance, multiple not grade capacities combined values are formed by optimum organization, it is compared one by one with capacitance switching numerical value, one group of capacitor combination for choosing difference minimum carries out switching.The capacitance group number of threephase load imbalance regulating device configuration designed in this way is less, and structure simplifies, and volume reduces, and reduces cost, while having preferably has grade to adjust threephase load imbalance effect.
Description
Technical field
The present invention relates to power distribution circuit engineering device technique fields, and in particular to a kind of optimization has a grade capacitor and inductor combination switching tune
Save threephase load unbalanced method.
Background technology
For the power supply mode of low-voltage network mainly using three-phase four-wire system, user mostly uses single phase power supply mode.Due to
The threephase load of connection is difficult to accomplish equal equilibrium, so, each phase load is necessarily caused to occur uneven, and then lead to three-phase electricity
Flow unbalanced situation, cause that increase is lost in line loss and supplementary transformer, transformer output capacity reduces, a certain phase in end or certain
The serious relatively low consequence for waiting influence power quality of two-phase voltage.
At present, power supply department is mostly adjusted using the method by the affiliated phase of manual switch on a regular basis customer power supply circuit
Threephase load degree of unbalancedness, this method time and effort consuming, and can not achieve online real-time adjusting control.It is a kind of it is lower-cost
The real-time adjustment control method of line is a kind of threephase load imbalance regulating device of design, by connecting non-equivalence electricity between phase line
Hold switching to shift three phases active power load, inductively or capacitively switching is mended by connecting non-equivalence between phase line and zero curve
Repay three phase reactive power make power factor more than 0.95 and close to 1 range, achieve the purpose that adjust the threephase load degree of balance.
But the not grade capacities group number limited since configuration can only be connected between phase line, it can only connect between phase line and zero curve
It connects that configuration is limited not to wait capacities or inductance group number, therefore carries out and there is a grade switching capacitance to be not readily reachable by preferable to adjust effect
Fruit will reach preferable regulating effect, certainly will need to configure many groups and not wait capacities or inductance, while want mating corresponding control
Fling-cut switch circuit has caused grade regulating device complicated, bulky, and control difficulty increase, cost increases.
Invention content
In order to overcome problems of the prior art, the present invention, which provides a kind of optimization, a grade capacitor and inductor combination switching tune
Save threephase load unbalanced method, design in this way threephase load imbalance regulating device configuration capacitance group number compared with
Few, structure simplifies, and volume reduces, and can reduce cost, while having preferably has grade to adjust threephase load imbalance effect.
To achieve the above object, optimization of the present invention has a grade capacitor and inductor combination switching to adjust threephase load uneven
Limited group of number of connection configuration does not wait capacities between method is included in phase line, limited group of the connection configuration between phase line and zero curve
Number does not wait capacities or inductance, when carrying out the adjusting of threephase load imbalance, according to power grid three-phase voltage, the electricity of Site Detection
Stream and power factor data are calculated when realizing threephase load balance adjustment between each phase line and between each phase line and zero curve
Then capacitance switching numerical value, according to the current switching state of each group capacitance, multiple grade capacity electricity is formed by optimum organization
Hold combined value, be compared one by one with capacitance switching numerical value, one group of capacitor combination for choosing difference minimum carries out switching.
The optimization has a grade capacitor and inductor combination switching adjusting threephase load unbalanced method to specifically include following steps：
The first step, calculating reach the adjusting capacitance switching numerical value of each phase line connection of active power balance effect,
Capacitance switching numerical computations are based on following principle：During the capacitance input connected between low-voltage network phase line, active power
According to from A phases, toward B phases, B phases toward C phases, the sequential transfer of the past A phases of C phases, the active power value of alternate transfer is approximately equal toPhase
Between capacitance input；A phase active power subtracts before A phases active power is equal to switching after capacitor switchingAB phase lines
Between capacitance input add capacitance input between CA phase lines, similarly, after capacitor switching B phases active power be equal to throw
B phase active power subtracts before cuttingBC phase lines between capacitance input add capacitance input between AB phase lines,
After capacitor switching C phases active power be equal to switching before C phase active power subtract CA phase lines between capacitance input add BC phases
Capacitance input between line；Three phases active power is equal and flat equal to switching three-phase active power after now setting switching
Mean value is obtained containing there are three three systems of linear equations that capacitance variable is put between phase line, and solving equations obtain each phase line
Between adjusting capacitance switching value, if it is positive value to calculate capacitance switching value, put between corresponding phase line equivalent
If it is negative value to calculate capacitance switching value, equivalent capacity capability value is cut off between corresponding phase line for capacitance value；
Second step keeps power factor more than 0.95 and close to the phase line in the range of 1 after calculating active power balance
The capacitance switching value between zero curve is calculated based on following principle：The capacitance input connected between low-voltage network phase line
When, it is equal in two increases that are synchronisedThe reactive power of capacitance input；A phases reactive power is equal to switching after capacitor switching
Preceding A phases reactive power addsCapacitance input adds between phase lineBetween phase line capacitance input add A phases with
Capacitance input between zero curve, similarly, B phase reactive powers add before B phases reactive power is equal to switching after capacitor switching
Capacitance input adds between phase lineCapacitance input adds capacitance between B phases and zero curve to put between phase line
It is worth, C phase reactive powers add before C phases reactive power is equal to switching after capacitor switchingCapacitance input adds between phase lineCapacitance input adds capacitance input between C phases and zero curve between phase line, and each phase work(is kept after setting switching
Rate factor is obtained more than 0.95 and close to each phase reactive power value in the range of 1 containing there are three capacitances between phase line and zero curve
Three systems of linear equations of capacity input variable, solving equations obtain the adjusting capacitance switching between each phase line and zero curve
Value if it is positive value to calculate capacitance switching value, puts into corresponding capacitance value between corresponding phase line and zero curve or cuts
Except corresponding inductive capacity value；If it is negative value to calculate capacitance switching value, excision is corresponding between corresponding phase line and zero curve
Capacitance value or the corresponding inductive capacity value of input；
It is n that limited group of number, which is configured, in connection between third step, each two phase lineXiang XiangAnd the capacitance of capacity is not waited, according to each group electricity
Hold current switching state, by the combination of different number group number capacitance, at most can combine to be formedGroup capacitance, each
Limited group of number n of connection configuration between phase line and zero curvePhase zeroAnd the capacitor and inductor of capacity is not waited, according to the current switching shape of each group capacitance
State by the combination of different number group number capacitance, at most can combine to be formedGroup capacitor and inductor；Calculate each group
When closing capacitance, the capability value for putting into capacitance or excision inductance is positive value, and excision capacitance or the capability value for putting into inductance are negative
Value；
The adjusting capacitance value to be put between 4th step, each phase line calculated using in the first step as approximation and
Between corresponding phase lineThe capability value of group capacitor combination compares one by one, and one group of minimum capacitance of capability value difference is obtained
Combination, the adjusting capacitance value to be put between each phase line and zero curve that are calculated using in second step is as approximation and right
It answers between phase line and zero curveGroup capacitor combination capability value compares one by one, and one group of minimum electricity of capability value difference is obtained
Hold inductor combination, then according to capacitor combination and one group of capacitor and inductor group between phase line and zero curve between the one group of phase line searched
It closes and carries out switching.
The calculating step for the capacitance to be put between the capacitance and phase line and zero curve to be put between phase line
For：
If three-phase load circuit A phase active-power PsBefore A, reactive power QBefore A, B phase active-power PsBefore B, reactive power QBefore B, C
Phase active-power PBefore C, reactive power QBefore C；The A phases capacitance Q to be put into B phasesAB, the B phases capacitance to be put into C phases
QBC, the C phases capacitance Q to be put into A phasesCA；A phases and the zero curve capacitance Q to be put intoAO, what B phases to be put into zero curve
Capacitance QBO, C phases and the zero curve capacitance Q to be put intoCO；Three-phase load circuit A phase active-power Ps after inputAfter A, it is idle
Power QAfter A, B phase active-power PsAfter B, reactive power QAfter B, C phase active-power PsAfter C, reactive power QAfter C；Power factor value is θ, root
According to three-phase circuit between phase line the transferable active power of switching capacitance, switching capacitance can compensate for idle between phase line and zero curve
The principle of power, is derived from equation below：
First formula：
Second formula：
Third formula：
4th formula：
5th formula：
6th formula：
Realize that threephase load balances, three phases active power is answered equal and removed equal to the sum of active power before input after input
With 3, i.e.,：Three phase reactive power should be after input：Substitute into respectively the first formula, the second formula, third formula,
4th formula, the 5th formula and the 6th formula solve system of linear equations, obtain the capacitance Q to be put between phase lineAB、QBC、
QCAAnd the capacitance Q to be put between phase line and zero curveAB、QBC、QCA。
Wherein power factor value is the range of θ between 0.95 to 1.
Further comprise：The scheme of switching capacitance between 3 each phase lines is obtained, the specific steps are：
The capacitance group number n of configuration will be connected between each phase lineXiang Xiang, successively by take out 1 group be combined, by take out it is multigroup into
Row combination takes out n until pressingXiang XiangGroup is combined, conformal to count in groupsBy not putting into capacitance
For positive value, the total capacity that each combination is obtained for negative value for capacitance is put into, being calculated between corresponding phase line successively will
The capacitance of input is compared, and a combination for taking difference minimum is respectively obtained between 3 each phase lines as switching scheme
The scheme of switching capacitance.
Further comprise：The scheme of switching capacitance inductance between 3 each phase lines and zero curve is obtained, the specific steps are：
The capacitance group number n of configuration will be connected between each phase line and zero curvePhase zero, 1 group is taken out successively and is combined, and is taken out multigroup
It is combined, until taking out nPhase zeroGroup is combined, conformal to count in groupsHold by capacitance is not put into
Amount is positive value with inductive capacity has been put into, and it is that the total of each combination is obtained in negative value to have put into capacitance and do not put into inductive capacity
Capacity calculates the capacitance to be put between corresponding phase line and zero curve and is compared successively, takes the one of difference minimum
A combination respectively obtains the scheme of switching capacitance inductance between 3 each phase lines and zero curve as switching scheme.
Then according to switching is electric between the scheme of switching capacitance and 3 each phase lines and zero curve between 3 each phase lines of acquisition
Hold the switching scheme progress switching that the scheme of inductance is formed.
The invention has the advantages that：Optimization of the present invention has a grade capacitor and inductor combination switching to adjust threephase load not
Balance method compared with prior art, need to only be configured seldom capacitor and inductor combination, i.e., need to only connect and be configured between phase line
Limit group number capacitance, the capacitor and inductor of limited group of number of connection configuration between phase line and zero curve, it is possible to form 2 by optimum organization
Exponential capacitor and inductor number of combinations, therefrom search with best regulating effect one group of capacitor and inductor combination, according to
The capacitor and inductor combination switching arrived, reaches and adjusts the unbalanced optimal effectiveness of threephase load, make simplified, volume subtracts
It is small, cost can be reduced.
Specific embodiment
The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention..
Optimization of the present invention has a grade capacitor and inductor combination switching adjusting threephase load unbalanced method to be included in phase line
Between connection configuration limited group of number not wait capacities, between phase line and zero curve connection configuration limited group of number not wait capacities
Or inductance, when carrying out the adjusting of threephase load imbalance, according to the power grid three-phase voltage, electric current and power factor number of Site Detection
According to, calculate realize threephase load balance adjustment when each phase line between and the capacitance switching number between each phase line and zero curve
Then value, according to the current switching state of each group capacitance, forms multiple not grade capacities combined values, one by one by optimum organization
It is compared with capacitance switching numerical value, one group of capacitor combination for choosing difference minimum carries out switching.
The optimization has a grade capacitor and inductor combination switching adjusting threephase load unbalanced method to specifically include following steps：
The first step, calculating reach the adjusting capacitance switching numerical value of each phase line connection of active power balance effect,
Capacitance switching numerical computations are based on following principle：During the capacitance input connected between low-voltage network phase line, active power
According to from A phases, toward B phases, B phases toward C phases, the sequential transfer of the past A phases of C phases, the active power value of alternate transfer is approximately equal toIt is alternate
Capacitance input；A phase active power subtracts before A phases active power is equal to switching after capacitor switchingAB phase lines between
Capacitance input adds capacitance input between CA phase lines, similarly, before B phases active power is equal to switching after capacitor switching
B phase active power subtractsBC phase lines between capacitance input add capacitance input between AB phase lines, capacitance
After switching C phases active power be equal to C phase active power before switching subtract capacitance input between CA phase lines add BC phase lines it
Between capacitance input；Now three phases active power is equal after setting switching and is equal to being averaged for switching three-phase active power
Value is obtained containing there are three three systems of linear equations that capacitance variable is put between phase line, solving equations obtain each phase line it
Between adjusting capacitance switching value, if it is positive value to calculate capacitance switching value, equivalent electricity is put between corresponding phase line
Hold capability value, if it is negative value to calculate capacitance switching value, equivalent capacity capability value is cut off between corresponding phase line；
Second step keeps power factor more than 0.95 and close to the phase line in the range of 1 after calculating active power balance
The capacitance switching value between zero curve is calculated based on following principle：The capacitance input connected between low-voltage network phase line
When, it is equal in two increases that are synchronisedThe reactive power of capacitance input；A phases reactive power is equal to switching after capacitor switching
Preceding A phases reactive power addsCapacitance input adds between phase lineBetween phase line capacitance input add A phases with
Capacitance input between zero curve, similarly, B phase reactive powers add before B phases reactive power is equal to switching after capacitor switching
Capacitance input adds between phase lineCapacitance input adds capacitance between B phases and zero curve to throw between phase line
Enter value, C phases reactive power adds equal to C phase reactive powers before switching after capacitor switchingCapacitance input adds between phase lineCapacitance input adds capacitance input between C phases and zero curve between phase line, and each phase work(is kept after setting switching
Rate factor is obtained more than 0.95 and close to each phase reactive power value in the range of 1 containing there are three capacitances between phase line and zero curve
Three systems of linear equations of capacity input variable, solving equations obtain the adjusting capacitance switching between each phase line and zero curve
Value if it is positive value to calculate capacitance switching value, puts into corresponding capacitance value between corresponding phase line and zero curve or cuts
Except corresponding inductive capacity value；If it is negative value to calculate capacitance switching value, excision is corresponding between corresponding phase line and zero curve
Capacitance value or the corresponding inductive capacity value of input；
It is n that limited group of number, which is configured, in connection between third step, each two phase lineXiang XiangAnd the capacitance of capacity is not waited, according to each group electricity
Hold current switching state, by the combination of different number group number capacitance, at most can combine to be formedGroup capacitance, each
Limited group of number n of connection configuration between phase line and zero curvePhase zeroAnd the capacitor and inductor of capacity is not waited, according to the current switching shape of each group capacitance
State by the combination of different number group number capacitance, at most can combine to be formedGroup capacitor and inductor；Calculate each group
When closing capacitance, the capability value for putting into capacitance or excision inductance is positive value, and excision capacitance or the capability value for putting into inductance are negative
Value；
The adjusting capacitance value to be put between 4th step, each phase line calculated using in the first step as approximation and
Between corresponding phase lineThe capability value of group capacitor combination compares one by one, and one group of minimum capacitance of capability value difference is obtained
Combination, the adjusting capacitance value to be put between each phase line and zero curve that are calculated using in second step is as approximation and right
It answers between phase line and zero curveGroup capacitor combination capability value compares one by one, and one group of minimum electricity of capability value difference is obtained
Hold inductor combination, then according to capacitor combination and one group of capacitor and inductor group between phase line and zero curve between the one group of phase line searched
It closes and carries out switching, then can obtain optimization has a grade capacitor and inductor combination switching to adjust the unbalanced optimal effectiveness of threephase load.
The calculating step for the capacitance to be put between the capacitance and phase line and zero curve to be put between phase line
For：
If three-phase load circuit A phase active-power PsBefore A, reactive power QBefore A, B phase active-power PsBefore B, reactive power QBefore B, C
Phase active-power PBefore C, reactive power QBefore C；The A phases capacitance Q to be put into B phasesAB, the B phases capacitance to be put into C phases
QBC, the C phases capacitance Q to be put into A phasesCA；A phases and the zero curve capacitance Q to be put intoAO, what B phases to be put into zero curve
Capacitance QBO, C phases and the zero curve capacitance Q to be put intoCO；Three-phase load circuit A phase active-power Ps after inputAfter A, it is idle
Power QAfter A, B phase active-power PsAfter B, reactive power QAfter B, C phase active-power PsAfter C, reactive power QAfter C；Power factor value is θ (models
Be trapped among between 0.95 to 1), according to three-phase circuit between phase line the transferable active power of switching capacitance, phase line and zero curve it
Between switching capacitance can compensate for the principle of reactive power, be derived from equation below：
First formula：
Second formula：
Third formula：
4th formula：
5th formula：
6th formula：
Realize that threephase load balances, three phases active power is answered equal and removed equal to the sum of active power before input after input
With 3, i.e.,：Three phase reactive power should be after input：Substitute into respectively the first formula, the second formula, third formula,
4th formula, the 5th formula and the 6th formula solve system of linear equations, obtain the capacitance Q to be put between phase lineAB、QBC、
QCAAnd the capacitance Q to be put between phase line and zero curveAB、QBC、QCA。
Further comprise：The scheme of switching capacitance between 3 each phase lines is obtained, the specific steps are：
The capacitance group number n of configuration will be connected between each phase lineXiang Xiang, successively by take out 1 group be combined, by take out it is multigroup into
Row combination takes out n until pressingXiang XiangGroup is combined, conformal to count in groupsBy not putting into capacitance
For positive value, the total capacity that each combination is obtained for negative value for capacitance is put into, being calculated between corresponding phase line successively will
The capacitance of input is compared, and a combination for taking difference minimum is respectively obtained between 3 each phase lines as switching scheme
The scheme of switching capacitance.
Further comprise：The scheme of switching capacitance inductance between 3 each phase lines and zero curve is obtained, the specific steps are：
The capacitance group number n of configuration will be connected between each phase line and zero curvePhase zero, 1 group is taken out successively and is combined, and is taken out multigroup
It is combined, until taking out nPhase zeroGroup is combined, conformal to count in groupsHold by capacitance is not put into
Amount is positive value with inductive capacity has been put into, and it is that the total of each combination is obtained in negative value to have put into capacitance and do not put into inductive capacity
Capacity calculates the capacitance to be put between corresponding phase line and zero curve and is compared successively, takes the one of difference minimum
A combination respectively obtains the scheme of switching capacitance inductance between 3 each phase lines and zero curve as switching scheme.
Then according to switching is electric between the scheme of switching capacitance and 3 each phase lines and zero curve between 3 each phase lines of acquisition
Hold the switching scheme progress switching that the scheme of inductance is formed.
Those listed above is a series of to be described in detail only for feasibility embodiment of the invention specifically
Bright, they are not to limit the scope of the invention, all equivalent implementations made without departing from skill spirit of the present invention
Or change should all be included in the protection scope of the present invention.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in each embodiment can also be properly combined, forms those skilled in the art
The other embodiment being appreciated that.
Claims (6)
1. a kind of optimization has a grade capacitor and inductor combination switching to adjust threephase load unbalanced method, which is characterized in that this method packet
It includes the limited group of number of connection configuration between phase line and does not wait capacities, limited group of number of connection configuration differs between phase line and zero curve
Capacity or inductance, when carrying out the adjusting of threephase load imbalance, according to power grid three-phase voltage, electric current and the work(of Site Detection
Rate factor data calculates capacitance when realizing threephase load balance adjustment between each phase line and between each phase line and zero curve and holds
Switching numerical value is measured, then, according to the current switching state of each group capacitance, multiple grade capacities is formed by optimum organization and are combined
Value, is compared one by one with capacitance switching numerical value, and one group of capacitor combination for choosing difference minimum carries out switching；
This method specifically includes following steps：
The first step, calculating reach the adjusting capacitance switching numerical value of each phase line connection of active power balance effect, capacitance
Capacity switching numerical computations are based on following principle：Connected between low-voltage network phase line capacitance input when, active power according to
From A phases toward B phases, B phases toward C phases, the sequential transfer of the past A phases of C phases, the active power value of alternate transfer is approximately equal toCapacitive coupling
Capacity input；A phase active power subtracts before A phases active power is equal to switching after capacitor switchingAB phase lines between capacitance
Capacity input adds capacitance input between CA phase lines, and similarly, B phases active power is equal to B phases before switching after capacitor switching
Active power subtractsBC phase lines between capacitance input add capacitance input between AB phase lines, capacitance is thrown
It cuts rear C phases active power and subtracts capacitance input between CA phase lines equal to C phase active power before switching and add between BC phase lines
Capacitance input；Now three phases active power is equal after setting switching and is equal to the average value of switching three-phase active power,
It obtains containing there are three three systems of linear equations that capacitance variable is put between phase line, solving equations are obtained between each phase line
Capacitance switching value is adjusted, if it is positive value to calculate capacitance switching value, input equivalent capacity is held between corresponding phase line
If it is negative value to calculate capacitance switching value, equivalent capacity capability value is cut off between corresponding phase line for magnitude；
Second step keeps power factor more than 0.95 and less than the phase line and zero in the range of 1 after calculating active power balance
Capacitance switching value between line is calculated based on following principle：During the capacitance input connected between low-voltage network phase line,
Two increases that are synchronised are equal toThe reactive power of capacitance input；A phases reactive power is equal to A phases before switching after capacitor switching
Reactive power addsCapacitance input adds between AB phase linesBetween CA phase lines capacitance input add A phases and zero curve it
Between capacitance input, similarly, after capacitor switching B phases reactive power be equal to switching before B phase reactive powers addAB phase lines it
Between capacitance input addCapacitance input adds capacitance input between B phases and zero curve between BC phase lines, electricity
C phases reactive power adds equal to C phase reactive powers before switching after holding switchingCapacitance input adds between BC phase linesCA phase lines
Between capacitance input add capacitance input between C phases and zero curve, each phase power factor is kept to exist after setting switching
More than 0.95 and less than each phase reactive power value in the range of 1, obtain containing that there are three capacitances between phase line and zero curve to put into
It is worth three systems of linear equations of variable, solving equations obtain the adjusting capacitance switching value between each phase line and zero curve, if meter
It is positive value to calculate capacitance switching value, then corresponding capacitance value is put between corresponding phase line and zero curve or excision is corresponding
Inductive capacity value；If it is negative value to calculate capacitance switching value, corresponding capacitance is cut off between corresponding phase line and zero curve
Capability value or the corresponding inductive capacity value of input；
It is n that limited group of number, which is configured, in connection between third step, each two phase lineXiang XiangAnd the capacitance of capacity is not waited, showed according to each group capacitance
When switching state, by the combination of different number group number capacitance, at most can combine to be formedGroup capacitance, each phase line
The limited group of number n of connection configuration between zero curvePhase zeroAnd the capacitance of capacity is not waited, according to the current switching state of each group capacitance, by not
With the combination of sets of numbers number capacitance, at most can combine to be formedGroup capacitance；When calculating each combination capacitor capacity,
The capability value for putting into capacitance or excision inductance is positive value, and the capability value for cutting off capacitance or input inductance is negative value；
The adjusting capacitance value to be put between 4th step, each phase line calculated using in the first step is as approximation and corresponds to
Between phase lineThe capability value of group capacitor combination compares one by one, and one group of minimum capacitor combination of capability value difference is obtained,
The adjusting capacitance value to be put between each phase line and zero curve that are calculated using in second step is as approximation and corresponds to phase line
Between zero curveGroup capacitor combination capability value compares one by one, and one group of minimum capacitor combination of capability value difference is obtained,
Then switching is carried out according to capacitor combination between the one group of phase line searched and one group of capacitor combination between phase line and zero curve.
2. a kind of optimization as described in claim 1 has a grade capacitor and inductor combination switching to adjust threephase load unbalanced method,
It is characterized in that, the calculating step for the capacitance to be put between the capacitance and phase line and zero curve to be put between phase line
For：
If three-phase load circuit A phase active-power PsBefore A, reactive power QBefore A, B phase active-power PsBefore B, reactive power QBefore B, C phases are active
Power PBefore C, reactive power QBefore C；The A phases capacitance Q to be put into B phasesAB, the B phases capacitance Q to be put into C phasesBC, C phases
The capacitance Q to be put into A phasesCA；A phases and the zero curve capacitance Q to be put intoAO, the B phases capacitance to be put into zero curve appearance
Measure QBO, C phases and the zero curve capacitance Q to be put intoCO；Three-phase load circuit A phase active-power Ps after inputAfter A, reactive power
QAfter A, B phase active-power PsAfter B, reactive power QAfter B, C phase active-power PsAfter C, reactive power QAfter C；Power factor value is θ, according to three
The transferable active power of circuitry phase switching capacitance between phase line, switching capacitance can compensate for reactive power between phase line and zero curve
Principle, be derived from equation below：
First formula：
Second formula：
Third formula：
4th formula：
5th formula：
6th formula：
Realize that threephase load balances, three phases active power is answered equal and equal to the sum of active power before input divided by 3 after input,
I.e.：Three phase reactive power should be after input：Substitute into respectively the first formula, the second formula, third formula,
4th formula, the 5th formula and the 6th formula solve system of linear equations, obtain the capacitance Q to be put between phase lineAB、QBC、
QCAAnd the capacitance Q to be put between phase line and zero curveAB、QBC、QCA。
3. a kind of optimization as claimed in claim 2 has a grade capacitor and inductor combination switching to adjust threephase load unbalanced method,
It is characterized in that, wherein power factor value is θ, and the value of θ is more than 0.95 and in the range of being less than 1.
4. a kind of optimization as claimed in claim 3 has a grade capacitor and inductor combination switching to adjust threephase load unbalanced method,
It is characterized in that, this method further comprises：The scheme of switching capacitance between 3 each phase lines is obtained, the specific steps are：
The capacitance group number n of configuration will be connected between each phase lineXiang Xiang, it is combined successively by taking out 1 group, multigroup group is carried out by taking out
It closes, n is taken out until pressingXiang XiangGroup is combined, conformal to count in groupsIt is just by capacitance is not put into
Value has put into capacitance as negative value, the total capacity of each combination has been obtained, being calculated between corresponding phase line will put into successively
Capacitance be compared, a combination for taking difference minimum respectively obtains switching between 3 each phase lines as switching scheme
The scheme of capacitance.
5. a kind of optimization as claimed in claim 4 has a grade capacitor and inductor combination switching to adjust threephase load unbalanced method,
It is characterized in that, this method further comprises：Obtain the scheme of switching capacitance inductance between 3 each phase lines and zero curve, specific steps
For：
The capacitance group number n of configuration will be connected between each phase line and zero curvePhase zero, 1 group is taken out successively and is combined, and takes out multigroup progress
Combination, until taking out nPhase zeroGroup is combined, conformal to count in groupsBy do not put into capacitance and
Inductive capacity has been put into as positive value, put into capacitance and has not put into inductive capacity as negative value, total appearance of each combination is obtained
Amount, the capacitance to be put into is calculated between corresponding phase line and zero curve and is compared successively, takes one of difference minimum
Combination respectively obtains the scheme of switching capacitance inductance between 3 each phase lines and zero curve as switching scheme.
6. a kind of optimization as claimed in claim 5 has a grade capacitor and inductor combination switching to adjust threephase load unbalanced method,
It is characterized in that, according to switching capacitance is electric between the scheme of switching capacitance and 3 each phase lines and zero curve between 3 each phase lines of acquisition
The switching scheme that the scheme of sense is formed carries out switching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710757611.4A CN107482655B (en) | 2017-08-29 | 2017-08-29 | A kind of optimization has a grade capacitor and inductor combination switching to adjust threephase load unbalanced method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710757611.4A CN107482655B (en) | 2017-08-29 | 2017-08-29 | A kind of optimization has a grade capacitor and inductor combination switching to adjust threephase load unbalanced method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107482655A CN107482655A (en) | 2017-12-15 |
| CN107482655B true CN107482655B (en) | 2018-06-19 |
Family
ID=60603973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710757611.4A Active CN107482655B (en) | 2017-08-29 | 2017-08-29 | A kind of optimization has a grade capacitor and inductor combination switching to adjust threephase load unbalanced method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107482655B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108493963B (en) * | 2018-03-31 | 2022-04-22 | 华南理工大学 | Interphase susceptance configuration method considering two-phase active power balance |
| CN110912159A (en) * | 2019-11-12 | 2020-03-24 | 许继变压器有限公司 | Three-phase unbalanced load governing system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101340094A (en) * | 2008-08-13 | 2009-01-07 | 丹东欣泰电气股份有限公司 | Automatic switching reactive compensator of tunable reactor type capacitor |
| CN102427235A (en) * | 2011-12-14 | 2012-04-25 | 北京天地华泰采矿工程技术有限公司 | Methods for distributing reactive power compensation capacity and switching branch circuits of passive filter |
| CN104953602A (en) * | 2014-08-22 | 2015-09-30 | 广东天月德电力科技有限公司 | Optimization method of automatic balance adjusting parameter of three-phase load |
| WO2016119820A1 (en) * | 2015-01-27 | 2016-08-04 | Abb Technology Ltd | Multilevel converter with energy storage |
| CN106099957A (en) * | 2016-06-07 | 2016-11-09 | 山东电工电气集团新能科技有限公司 | Capacitor and inductor three-phase imbalance and idle controlling device and method |
| CN106356877A (en) * | 2016-09-20 | 2017-01-25 | 广东工业大学 | Passive compensation device and method in allusion to three-phase load unbalance |
| CN106887849A (en) * | 2015-12-15 | 2017-06-23 | 北海市深蓝科技发展有限责任公司 | A kind of method for lifting terminal voltage along low-voltage distributing line segmentation switching capacitance |
-
2017
- 2017-08-29 CN CN201710757611.4A patent/CN107482655B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101340094A (en) * | 2008-08-13 | 2009-01-07 | 丹东欣泰电气股份有限公司 | Automatic switching reactive compensator of tunable reactor type capacitor |
| CN102427235A (en) * | 2011-12-14 | 2012-04-25 | 北京天地华泰采矿工程技术有限公司 | Methods for distributing reactive power compensation capacity and switching branch circuits of passive filter |
| CN104953602A (en) * | 2014-08-22 | 2015-09-30 | 广东天月德电力科技有限公司 | Optimization method of automatic balance adjusting parameter of three-phase load |
| WO2016119820A1 (en) * | 2015-01-27 | 2016-08-04 | Abb Technology Ltd | Multilevel converter with energy storage |
| CN106887849A (en) * | 2015-12-15 | 2017-06-23 | 北海市深蓝科技发展有限责任公司 | A kind of method for lifting terminal voltage along low-voltage distributing line segmentation switching capacitance |
| CN106099957A (en) * | 2016-06-07 | 2016-11-09 | 山东电工电气集团新能科技有限公司 | Capacitor and inductor three-phase imbalance and idle controlling device and method |
| CN106356877A (en) * | 2016-09-20 | 2017-01-25 | 广东工业大学 | Passive compensation device and method in allusion to three-phase load unbalance |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107482655A (en) | 2017-12-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104852394B (en) | A kind of equal balance system of electrical load suitable for low-voltage network | |
| CN106684895B (en) | Three-phase imbalance administering method and commutation system | |
| CN109921445B (en) | Transformer area phase change switch control method considering branch line power balance | |
| CN105226684A (en) | A kind of low voltage electric network three-phase imbalance control method based on phase-change switch | |
| CN107482655B (en) | A kind of optimization has a grade capacitor and inductor combination switching to adjust threephase load unbalanced method | |
| CN108493952A (en) | A kind of exchange micro-capacitance sensor based on fuzzy self-adaption compensation is idle to divide equally control method | |
| CN104852395B (en) | A kind of electrical load equalizing system for low-voltage network | |
| CN101728834B (en) | Reactive automatic compensating method | |
| CN104578182A (en) | Low-delay robust power droop multi-loop control method | |
| CN110098660A (en) | A kind of state-of-charge balance control method of three Port Translation device of series hybrid energy storage | |
| CN105978004A (en) | System for automatically adjusting balance of three-phase loads of branch unit by utilizing integral current method or electric energy method | |
| CN104167747A (en) | Unbalance and reactive compensation control device for low-voltage power grid | |
| CN106655212B (en) | The reactive power compensation integrated control method of passive power distribution net and system | |
| CN204189595U (en) | Loaded capacity-regulated transformer | |
| CN107528328A (en) | A kind of electric energy governing device in power distribution network | |
| CN109980665A (en) | A kind of calculation method of power distribution network threephase load imbalance adjustment parameter optimal value | |
| CN214337572U (en) | Draw-out type low-voltage switch cabinet power factor stepless compensation device | |
| CN107947218B (en) | A kind of Multi-end flexible direct current transmission system power distribution method based on V-I curve | |
| CN103178529A (en) | Phase-splitting control method and device of magnetic control type quick response dynamic reactive power compensation system | |
| CN102270849B (en) | Method for suppressing neutral current of transformer | |
| CN105790284A (en) | Reactive compensation control system and reactive compensation control method based on fuzzy control | |
| CN105337286A (en) | Series compensation circuit, system and method for power distribution network | |
| Gupta et al. | Performance of distributed power flow controller on system behavior under unbalance fault condition | |
| CN112310974B (en) | Neutral point small reactance value-taking method of magnetic control type controllable reactor | |
| CN108183494B (en) | Method for adjusting three-phase voltage unbalance of power distribution network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A Method for Optimizing the Combination Switching of Cascaded Capacitors and Inductors to Adjust the Imbalance of Three Phase Load Effective date of registration: 20230724 Granted publication date: 20180619 Pledgee: Guangdong Development Bank Limited by Share Ltd. Guangzhou branch Pledgor: GUANGDONG TIANYUEDE ELECTRIC POWER TECHNOLOGY CO.,LTD. Registration number: Y2023980049411 |