CN107482655A - One kind optimization has a grade capacitor and inductor combination switching regulation threephase load unbalanced method - Google Patents
One kind optimization has a grade capacitor and inductor combination switching regulation threephase load unbalanced method Download PDFInfo
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- CN107482655A CN107482655A CN201710757611.4A CN201710757611A CN107482655A CN 107482655 A CN107482655 A CN 107482655A CN 201710757611 A CN201710757611 A CN 201710757611A CN 107482655 A CN107482655 A CN 107482655A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention discloses one kind optimization a grade capacitor and inductor combination switching regulation threephase load unbalanced method, limited group of number of connection configuration does not wait capacity between this method is included in phase line, limited group of number of connection configuration capacity or the inductance such as not between phase line and zero line, when carrying out threephase load imbalance regulation, according to the power network three-phase voltage of Site Detection, electric current and power factor data, calculate the capacitance switching numerical value between each phase line and between each phase line and zero line when realizing threephase load balance adjustment, then, according to the current switching state of each group electric capacity, multiple not grade capacity combined values are formed by optimum organization, one by one compared with capacitance switching numerical value, choose one group of minimum capacitor combination of difference and carry out switching.The capacitance group number of the threephase load imbalance adjusting means configuration designed in this way is less, and structure simplifies, and volume reduces, and reduces cost, while having preferably has level to adjust threephase load imbalance effect.
Description
Technical field
The present invention relates to power distribution circuit engineering device technique field, and in particular to one kind optimization has a grade capacitor and inductor combination switching to adjust
Save threephase load unbalanced method.
Background technology
The power supply mode of low-voltage network mainly uses three-phase four-wire system, and user mostly uses single phase power supply mode.Due to
The threephase load of connection is difficult to accomplish equal equilibrium, so, necessarily cause each phase load to occur uneven, and then cause 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 the influence quality of power supply 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 online real-time adjustment control can not be realized.It is a kind of it is lower-cost
The real-time adjustment control method of line is a kind of threephase load imbalance adjusting means 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 line
Repay three phase reactive power make power factor more than 0.95 and close to 1 scope, reach regulation the threephase load degree of balance purpose.
But the not grade capacity group number limited due to configuration can only be connected between phase line, it can only connect between phase line and zero line
Connect that configuration is limited not to wait capacity or inductive bank number, therefore carrying out has a grade switching capacitance to be not readily reachable by preferably regulation effect
Fruit, to reach preferable regulating effect, certainly will need to configure much groups and not wait capacity or inductance, while want supporting corresponding control
Fling-cut switch circuit, cause grade adjusting means complicated, bulky, control difficulty increase, cost increase.
The content of the invention
In order to overcome problems of the prior art, the present invention, which provides a kind of optimization, has a grade capacitor and inductor combination switching to adjust
Save threephase load unbalanced method, design in this way threephase load imbalance adjusting means configuration capacitance group number compared with
Few, structure simplifies, and volume reduces, and can reduce cost, while having preferably has level to adjust threephase load imbalance effect.
To achieve the above object, optimization of the present invention has grade capacitor and inductor combination switching regulation threephase load uneven
Limited group of number of connection configuration does not wait capacity between method is included in phase line, limited group of the connection configuration between phase line and zero line
Number does not wait capacity or inductance, when carrying out threephase load imbalance regulation, according to power network 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 line
Capacitance switching numerical value, then, according to the current switching state of each group electric capacity, multiple grade capacity electricity are formed by optimum organization
Hold combined value, one by one compared with capacitance switching numerical value, choose one group of minimum capacitor combination of difference and carry out switching.
Described optimization has a grade capacitor and inductor combination switching regulation threephase load unbalanced method to specifically include following steps：
The first step, calculating reach the regulation capacitance switching numerical value of each phase line connection of active power balance effect, its
Capacitance switching numerical computations are based on following principle：During the electric capacity input connected between low-voltage network phase line, active power
It is approximately equal to 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 transferPhase
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
Average, obtain obtaining each phase line containing three systems of linear equations for putting into capacitance variable between three phase lines, solving equations
Between regulation capacitance switching value, if it is on the occasion of being put between corresponding phase line equivalent to calculate capacitance switching value
Capacitance value, if it is negative value to calculate capacitance switching value, equivalent capacity capability value is cut off between corresponding phase line；
Second step, power factor is kept 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 line, its calculating are based on following principle：The electric capacity 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 line, 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 line 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 line between phase line, and each phase work(is kept after setting switching
Rate factor is obtained containing three electric capacity between phase line and zero line more than 0.95 and close to each phase reactive power value in the range of 1
Three systems of linear equations of capacity input variable, solving equations obtain the regulation capacitance switching between each phase line and zero line
Value, if it is on the occasion of putting into corresponding capacitance value between corresponding phase line and zero line, or cut to calculate capacitance switching value
Except corresponding inductive capacity value；If it is negative value to calculate capacitance switching value, excision is corresponding between corresponding phase line and zero line
Capacitance value, or the corresponding inductive capacity value of input；
Limited group of number of connection configuration is n between 3rd step, each two phase lineXiang XiangAnd the electric capacity of capacity such as not, according to each group electricity
Hold current switching state, by the combination of varying number group number electric capacity, at most can combine to be formedGroup electric capacity, each
Limited group of number n of connection configuration between phase line and zero linePhase zeroAnd the capacitor and inductor of capacity such as not, according to the current switching shape of each group electric capacity
State, by the combination of varying number group number electric capacity, at most it can combine to be formedGroup capacitor and inductor；Calculate each group
When closing capacitance, put into electric capacity or cut off the capability value of inductance as on the occasion of excision electric capacity or the capability value for putting into inductance are negative
Value；
The regulation 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, obtains one group of minimum electric capacity of capability value difference
Combination, the regulation capacitance value to be put between each phase line and zero line that are calculated using in second step are and right as approximation
Answer between phase line and zero lineGroup capacitor combination capability value compares one by one, obtains one group of minimum electricity of capability value difference
Hold inductor combination, then according to capacitor combination and one group of capacitor and inductor group between phase line and zero line between the one group of phase line searched
Close and carry out switching.
The calculation procedure for the capacitance to be put between the capacitance and phase line and zero line 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 line capacitance Q to be put intoAO, what B phases to be put into zero line
Capacitance QBO, C phases and the zero line 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 line
The principle of power, is derived from equation below：
First formula：
Second formula：
3rd formula：
4th formula：
5th formula：
6th formula：
Realize that threephase load balances, three phases active power is answered equal and removed equal to active power sum before input after input
With 3, i.e.,：Three phase reactive power should be after input：
The first formula, the second formula, the 3rd formula, the 4th formula, the 5th formula and the 6th formula are substituted into respectively, solve system of linear equations,
Draw the capacitance Q to be put between phase lineAB、QBC、QCA, and the capacitance Q to be put between phase line and zero lineAB、
QBC、QCA。
Wherein power factor value is θ scope between 0.95 to 1.
Further comprise：The scheme of switching capacitance between 3 each phase lines is obtained, is concretely comprised the following steps：
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 enter
Row combination, until by taking-up nXiang XiangGroup is combined, conformal to count in groupsBy not putting into capacitance
For on the occasion of it is the total capacity that negative value obtains each combination to have put into capacitance, and being calculated successively between corresponding phase line will
The capacitance of input is compared, and a combination for taking difference minimum is used as switching scheme, is respectively obtained between 3 each phase lines
The scheme of switching capacitance.
Further comprise：The scheme of switching capacitance inductance between 3 each phase lines and zero line is obtained, is concretely comprised the following steps：
The capacitance group number n of configuration will be connected between each phase line and zero linePhase 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 electric capacity is not put into
Amount is on the occasion of it is that negative value obtains the total of each combination to have put into capacitance and do not put into inductive capacity with inductive capacity has been put into
Capacity, take the one of difference minimum compared with the capacitance to be put into is calculated between zero line with corresponding phase line successively
Individual combination is used as switching scheme, respectively obtains the scheme of switching capacitance inductance between 3 each phase lines and zero line.
Then according to switching is electric between the scheme of switching capacitance and 3 each phase lines and zero line 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 grade capacitor and inductor combination switching regulation threephase load not
Balance method compared with prior art, need to only configure seldom capacitor and inductor combination, i.e., need to only connect and be configured between phase line
Limit group number electric capacity, the capacitor and inductor of limited group of number of connection configuration between phase line and zero line, 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 the regulation unbalanced optimal effectiveness of threephase load, makes simplified, volume subtracts
It is small, cost can be reduced.
Embodiment
Following examples are used to illustrate the present invention, but are not limited to the scope of the present invention.
Optimization of the present invention has a grade capacitor and inductor combination switching regulation threephase load unbalanced method to be included in phase line
Between connection limited group of number of configuration do not wait capacity, limited group of number of the connection configuration capacity such as not between phase line and zero line
Or inductance, when carrying out threephase load imbalance regulation, according to the power network three-phase voltage, electric current and power factor number of Site Detection
According to calculating the capacitance switching number between each phase line and between each phase line and zero line when realizing threephase load balance adjustment
Value, then, according to the current switching state of each group electric capacity, multiple not grade capacity combined values are formed by optimum organization, one by one
Compared with capacitance switching numerical value, choose one group of minimum capacitor combination of difference and carry out switching.
Described optimization has a grade capacitor and inductor combination switching regulation threephase load unbalanced method to specifically include following steps：
The first step, calculating reach the regulation capacitance switching numerical value of each phase line connection of active power balance effect, its
Capacitance switching numerical computations are based on following principle：During the electric capacity input connected between low-voltage network phase line, active power
It is approximately equal to 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 transferIt 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, electric capacity
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, obtain containing between three phase lines put into capacitance variable three systems of linear equations, solving equations obtain each phase line it
Between regulation capacitance switching value, if it is on the occasion of putting into equivalent electric between corresponding phase line to calculate capacitance switching value
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, power factor is kept 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 line, its calculating are based on following principle：The electric capacity 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 line, 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 line 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 line between phase line, and each phase work(is kept after setting switching
Rate factor is obtained containing three electric capacity between phase line and zero line more than 0.95 and close to each phase reactive power value in the range of 1
Three systems of linear equations of capacity input variable, solving equations obtain the regulation capacitance switching between each phase line and zero line
Value, if it is on the occasion of putting into corresponding capacitance value between corresponding phase line and zero line, or cut to calculate capacitance switching value
Except corresponding inductive capacity value；If it is negative value to calculate capacitance switching value, excision is corresponding between corresponding phase line and zero line
Capacitance value, or the corresponding inductive capacity value of input；
Limited group of number of connection configuration is n between 3rd step, each two phase lineXiang XiangAnd the electric capacity of capacity such as not, according to each group electricity
Hold current switching state, by the combination of varying number group number electric capacity, at most can combine to be formedGroup electric capacity, each
Limited group of number n of connection configuration between phase line and zero linePhase zeroAnd the capacitor and inductor of capacity such as not, according to the current switching shape of each group electric capacity
State, by the combination of varying number group number electric capacity, at most it can combine to be formedGroup capacitor and inductor；Calculate each group
When closing capacitance, put into electric capacity or cut off the capability value of inductance as on the occasion of excision electric capacity or the capability value for putting into inductance are negative
Value；
The regulation 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, obtains one group of minimum electric capacity of capability value difference
Combination, the regulation capacitance value to be put between each phase line and zero line that are calculated using in second step are and right as approximation
Answer between phase line and zero lineGroup capacitor combination capability value compares one by one, obtains one group of minimum electricity of capability value difference
Hold inductor combination, then according to capacitor combination and one group of capacitor and inductor group between phase line and zero line between the one group of phase line searched
Close and carry out switching, then can obtain optimization has grade capacitor and inductor combination switching regulation unbalanced optimal effectiveness of threephase load.
The calculation procedure for the capacitance to be put between the capacitance and phase line and zero line 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 line capacitance Q to be put intoAO, what B phases to be put into zero line
Capacitance QBO, C phases and the zero line 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 line it
Between switching capacitance can compensate for the principle of reactive power, be derived from equation below：
First formula：
Second formula：
3rd formula：
4th formula：
5th formula：
6th formula：
Realize that threephase load balances, three phases active power is answered equal and removed equal to active power sum before input after input
With 3, i.e.,：Three phase reactive power should be after input：
The first formula, the second formula, the 3rd formula, the 4th formula, the 5th formula and the 6th formula are substituted into respectively, solve system of linear equations,
Draw the capacitance Q to be put between phase lineAB、QBC、QCA, and the capacitance Q to be put between phase line and zero lineAB、
QBC、QCA。
Further comprise：The scheme of switching capacitance between 3 each phase lines is obtained, is concretely comprised the following steps：
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 enter
Row combination, until by taking-up nXiang XiangGroup is combined, conformal to count in groupsIt is by capacitance is not put into
On the occasion of it is the total capacity that negative value obtains each combination to have put into capacitance, and calculated between corresponding phase line to throw successively
The capacitance entered is compared, and a combination for taking difference minimum is used as switching scheme, is respectively obtained and is thrown between 3 each phase lines
Cut the scheme of electric capacity.
Further comprise：The scheme of switching capacitance inductance between 3 each phase lines and zero line is obtained, is concretely comprised the following steps：
The capacitance group number n of configuration will be connected between each phase line and zero linePhase 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 electric capacity is not put into
Amount is on the occasion of it is that negative value obtains the total of each combination to have put into capacitance and do not put into inductive capacity with inductive capacity has been put into
Capacity, take the one of difference minimum compared with the capacitance to be put into is calculated between zero line with corresponding phase line successively
Individual combination is used as switching scheme, respectively obtains the scheme of switching capacitance inductance between 3 each phase lines and zero line.
Then according to switching is electric between the scheme of switching capacitance and 3 each phase lines and zero line 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 simultaneously are not used to limit the scope of the invention, all equivalent implementations made without departing from skill spirit of the present invention
Or change should be included in the scope of the protection.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that those skilled in the art should for clarity
Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
It is appreciated that other embodiment.
Claims (7)
1. one kind optimization has a grade capacitor and inductor combination switching regulation threephase load unbalanced method, it is characterised in that this method bag
Include the limited group of number of connection configuration between phase line and do not wait capacity, the limited group of number of connection configuration between phase line and zero line
Capacity or inductance, when carrying out threephase load imbalance regulation, according to power network three-phase voltage, electric current and the work(of Site Detection
Rate factor data, calculate electric capacity when realizing threephase load balance adjustment between each phase line and between each phase line and zero line and hold
Switching numerical value is measured, then, according to the current switching state of each group electric capacity, multiple grade capacities is formed by optimum organization and combined
Value, one by one compared with capacitance switching numerical value, choose one group of minimum capacitor combination of difference and carry out switching.
2. a kind of optimization as claimed in claim 1 has a grade capacitor and inductor combination switching regulation threephase load unbalanced method, its
It is characterised by, this method specifically includes following steps：
The first step, calculating reach the regulation capacitance switching numerical value of each phase line connection of active power balance effect, its electric capacity
Capacity switching numerical computations are based on following principle：Connected between low-voltage network phase line electric capacity input when, active power according to
It is approximately equal 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 transferCapacitive coupling
Capacity input；A phase active power subtracts before A phases active power is equal to switching after capacitor switchingAB phase lines between electric capacity
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, capacitor switching
C phases active power, which is equal to C phase active power before switching and subtracts capacitance input between CA phase lines, afterwards adds electricity between BC phase lines
Hold capacity input；Now three phases active power is equal after setting switching and is equal to the average value of switching three-phase active power, obtains
The tune between each phase line is obtained to containing three systems of linear equations that capacitance variable is put between three phase lines, solving equations
Capacitance switching value is saved, if it is on the occasion of the input equivalent capacity capacity between corresponding phase line to calculate capacitance switching value
Value, if it is negative value to calculate capacitance switching value, equivalent capacity capability value is cut off between corresponding phase line；
Second step, power factor is kept more than 0.95 and close to the phase line in the range of 1 and zero after calculating active power balance
Capacitance switching value between line, its calculating are based on following principle：During the electric capacity 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 line 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 line 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 line, keep each phase power factor to exist after setting switching
More than 0.95 and close to each phase reactive power value in the range of 1, obtain putting into containing three capacitances between phase line and zero line
It is worth three systems of linear equations of variable, solving equations obtain the regulation capacitance switching value between each phase line and zero line, if meter
It is on the occasion of then putting into corresponding capacitance value between corresponding phase line and zero line, or excision is corresponding to calculate capacitance switching value
Inductive capacity value；If it is negative value to calculate capacitance switching value, corresponding electric capacity is cut off between corresponding phase line and zero line
Capability value, or the corresponding inductive capacity value of input；
Limited group of number of connection configuration is n between 3rd step, each two phase lineXiang XiangAnd the electric capacity of capacity such as not, showed according to each group electric capacity
When switching state, by the combination of varying number group number electric capacity, at most can combine to be formedGroup electric capacity, each phase line
Limited group of number n of configuration is connected between zero linePhase zeroAnd the capacitor and inductor of capacity such as not, according to the current switching state of each group electric capacity, lead to
The combination of varying number group number electric capacity is crossed, at most can combine to be formedGroup capacitor and inductor；Calculate each combination capacitor
During capacity, put into electric capacity or cut off the capability value of inductance as on the occasion of the capability value for cutting off electric capacity or input inductance is negative value；
The regulation capacitance value to be put between 4th step, each phase line calculated using in the first step is as approximation, and correspondingly
Between phase lineThe capability value of group capacitor combination compares one by one, obtains one group of minimum capacitance group of capability value difference
Close, the regulation capacitance value to be put between each phase line and zero line that are calculated using in second step is as approximation, and correspondingly
Between phase line and zero lineGroup capacitor combination capability value compares one by one, obtains one group of minimum electric capacity of capability value difference
Inductor combination, then combined according to capacitor combination and one group of capacitor and inductor between phase line and zero line between the one group of phase line searched
Carry out switching.
3. a kind of optimization as claimed in claim 2 has a grade capacitor and inductor combination switching regulation threephase load unbalanced method, its
It is characterised by, the calculation procedure for the capacitance to be put between the capacitance and phase line and zero line 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 line capacitance Q to be put intoAO, the B phases electric capacity to be put into zero line appearance
Measure QBO, C phases and the zero line 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 line
Principle, be derived from equation below：
First formula：
Second formula：
3rd formula：
4th formula：
5th formula：
6th formula：
Realize that threephase load balances, three phases active power is answered equal and equal to active power sum divided by 3 before input after input,
I.e.：Three phase reactive power should be after input：
The first formula, the second formula, the 3rd formula, the 4th formula, the 5th formula and the 6th formula are substituted into respectively, solve system of linear equations,
Draw the capacitance Q to be put between phase lineAB、QBC、QCA, and the capacitance Q to be put between phase line and zero lineAB、
QBC、QCA。
4. a kind of optimization as claimed in claim 3 has a grade capacitor and inductor combination switching regulation threephase load unbalanced method, its
It is characterised by, wherein power factor value is θ scope between 0.95 to 1.
5. a kind of optimization as claimed in claim 4 has a grade capacitor and inductor combination switching regulation threephase load unbalanced method, its
It is characterised by, this method further comprises：The scheme of switching capacitance between 3 each phase lines is obtained, is concretely comprised the following steps：
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
Close, until by taking-up nXiang XiangGroup is combined, conformal to count in groupsBy do not put into capacitance be on the occasion of,
The total capacity that capacitance obtains each combination for negative value has been put into, has calculated the electricity to be put between corresponding phase line successively
Hold capacity to be compared, a combination for taking difference minimum is used as switching scheme, respectively obtains switching capacitance between 3 each phase lines
Scheme.
6. a kind of optimization as claimed in claim 5 has a grade capacitor and inductor combination switching regulation threephase load unbalanced method, its
It is characterised by, this method further comprises：Obtain the scheme of switching capacitance inductance between 3 each phase lines and zero line, specific steps
For：
The capacitance group number n of configuration will be connected between each phase line and zero linePhase 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 not putting into capacitance and
Put into inductive capacity be on the occasion of, it is that negative value obtains the total capacity of each combination to have put into capacitance and do not put into inductive capacity,
Successively with corresponding phase line compared with the capacitance to be put into is calculated between zero line, the combination that difference is minimum is taken
As switching scheme, the scheme of switching capacitance inductance between 3 each phase lines and zero line is respectively obtained.
7. a kind of optimization as claimed in claim 6 has a grade capacitor and inductor combination switching regulation threephase load unbalanced method, its
It is characterised by, according to switching capacitance is electric between the scheme of switching capacitance and 3 each phase lines and zero line between 3 each phase lines of acquisition
The switching scheme that the scheme of sense is formed carries out switching.
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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 |
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