CN205960658U - Three phase load automatic regulating apparatus of optimization type distribution network - Google Patents
Three phase load automatic regulating apparatus of optimization type distribution network Download PDFInfo
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- CN205960658U CN205960658U CN201620555503.XU CN201620555503U CN205960658U CN 205960658 U CN205960658 U CN 205960658U CN 201620555503 U CN201620555503 U CN 201620555503U CN 205960658 U CN205960658 U CN 205960658U
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- 239000003990 capacitor Substances 0.000 claims abstract description 10
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- 230000003750 conditioning effect Effects 0.000 abstract 3
- 239000000203 mixture Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 230000005611 electricity Effects 0.000 description 6
- 238000009434 installation Methods 0.000 description 6
- 230000006378 damage Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000001932 seasonal effect Effects 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
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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
- 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
- Y02E40/30—Reactive power compensation
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The utility model discloses a three phase load automatic regulating apparatus of optimization type distribution network, include unbalanced three phase conditioning controller, switch circuit and the space compensation unit and the alternate compensation unit that control by the unbalanced three phase conditioning controller, space compensation unit is a plurality of building -out capacitors group of setting up according to the size of three -phase inequality in the distribution network, a plurality of compensation reactor that alternate compensation unit set up for the size according to the idle volume of distribution transformer. The unbalanced three phase conditioning controller is automatic calculation distribution network three phase line's active power and reactive power on line, selects suitable space compensation capacity and alternate compensation capacity, controls the automatic switching of blend switch then, and each compensates mutually to the distribution network, guarantees the load balancing between each looks circuit of distribution network, adopt one -way reactor among the alternate compensation unit, except the effect that possesses reactive compensation still has the effect that reduces power factor, guarantee that the power factor who respectively takes a fancy to is less than 1.
Description
Technical field
This utility model is related to a kind of Optimization-type power distribution network three-phase load self-checking device it is adaptable to low-voltage power supply system
Middle three-phase imbalance load is administered, and belongs to power technology and electronic technology field.
Background technology
In power system, consuming of electric energy is mainly dependence distribution to realize, especially relies on power distribution network low pressure real
Existing.China's low voltage electric load typically refers to the load that alternating current 220V/380V system is carried.Alternating current 220V/380V system is led to
Often it is made up of three-phase and four-line, i.e. A phase, B phase, C phase, N phase.Power distribution network low-voltage electric energy is to rely on the cable run of certain distance or lead
Line circuit conveying and distribution, the inductance in low-voltage circuit is inevitable.Thus, the reactive power in load is also just deposited really
?.The load that power distribution network low-pressure side is carried comprises single-phase and three-phase load, for threephase motor, three during normal operation
Phase load is in poised state, is nearly all single-phase load for residential electricity consumption, makes power distribution network be in absolute unbalanced state.Again
It, because resident load typically uses cable or wire to draw from step down side, be difficult to during installation control transformator output
Sharing of load balances.Although be that when installing, three-phase load distribution is in a balanced way, but due to the seasonal, period of electricity consumption and not
Same when rate, the imbalance of three-phase load is absolute existence.Fact proved, in some places, three-phase imbalance rate is up to 80%
Above it may be said that low-voltage power system three-phase load absolute equilibrium is perfect condition, imbalance is normality.
The imbalance of three-phase load, is the increase of line loss to the first big harm that power system brings.Line loss
Square being directly proportional of increased numerical value and electric current.Assume that certain three-phase line or transformer resistance are equal and are equal to R, if three-phase
Load is balance, and it is lost △ P=I2R, and △ Pa=△ Pb=△ Pc.Three-phase total losses ∑ △ P=3I2R.When system is in not
During poised state it is assumed that A phase load is zero, and B, C biphase mean allocation A phase current, then system loss △ Pa=0, △ Pb=
△Pc=(1.5I)2R=2.25I2R, then circuit total losses ∑ △ P=4.5I2R, line loss incrementss are 4.5I2R-3I2R=
1.5I2R, that is, always line loss increased 50%.Easily release, if three-phase load is mutually provided by one, ∑ △ P=(3I) 2R=now
9I2R, then line loss incrementss are 9I2R-3I2R=6I2R, that is, always line loss increased 200%.The circuit being in operation often because
Burn with anger for certain phase excessively stream, operating transformator can be because the heating oil leak of low pressure phase overcurrent or wiring pile close and burn
Bad.For power department, increased breakdown repair number of times and O＆M cost, reduce power supply reliability.
The imbalance of three-phase load, is that transformer iron core loss increases to the second largest harm that power system brings.Y/Y0
Or the distribution transformer of △/Y0 wiring, adopt three-iron core column structure, when there is three-phase current unbalance, primary side no zero sequence more
Electric current exists, and secondary side is with the presence of zero-sequence current, and this electric current is pure exciting current generation zero sequence fluxes, because this magnetic flux does not close
Close magnetic circuit, need to be closed by fuel tank tank wall, thus heating produces loss in iron core, fuel tank and conductive magnet accessories.
The imbalance of three-phase load, is to produce variation to the third-largest harm that power system brings, can lead when serious
Cause the imbalance of three-phase voltage, the even motor damage of exerting oneself of impact threephase motor.
Currently, power department solves the method for three-phase imbalance, and residential electricity consumption scene of mainly often dispatching officers is gone to adjust
Load.But the imbalance of three-phase load is a kind of dynamic process, there is the seasonal, period of it, at any time all in change, by people
The method of work Load adjustment can only solve temporary problem, and must not solve root problem, and time-consuming, take a lot of work, produce little effect.
In addition with common benefit and point compensating method, three-phase imbalance load is adjusted, solve the problems, such as three-phase imbalance.Tradition
Common compensating method be the electric capacity accessing equivalent between three-phase system line, but the method throws away existing defects it is assumed that transformer low voltage is defeated
Go out voltage magnitude equal, 120 ° of phase.There are 0 ° of UA=U ∠, 120 ° of ∠ -120 ° of UB=U, UC=U ∠；The active electricity of each phase
Flow for 0 ° of Iar=U/Ra ∠, 120 ° of ∠ -120 ° of Ibr=U/Rb, Icr=U/Rc ∠.After accessing equivalent electric capacity, each phase capacitive reactance is Xa=
Xb=Xc=X∠-90°；Then each phase capacitance current is respectively 90 ° of Iaq=U ∠ 0 °/X ∠, 90 °=U/X ∠；Ibq=U∠-120°/X∠
90°=U/X∠30°；Icq=U∠120°/X∠90°=U/X∠210°.After accessing electric capacity, the electric current of each phase is Ia=Iar+Iaq=
Iar+U/X∠90°；Ib=Ibr+Ibq=Ibr+U/X∠-30°；Ic=Icr+Icq=Icr+U/X∠210°.Knowable to above formula, connect
Enter after mending electric capacity altogether, because the U/X numerical value of each phase is equal, numerically variable quantity is also equal for the electric current of each phase, so can not rise
To the effect of balanced load, certain angle can only be changed on vector.A traditional point compensating method is mutually indirect in three-phase system
Enter different electric capacity, the capacitance current in certain phase is vertical with the watt current in this phase, throwing in watt current for the capacitance current
Shadow is zero, so watt current and active power can not be changed.
Therefore, for the deficiencies in the prior art, working out a kind of Optimization-type power distribution network three-phase load self-checking device is
Technical task highly significant.
Content of the invention
The purpose of this utility model is the problems referred to above in order to solve prior art presence, thus providing a kind of Optimization-type to join
Electrical network three-phase load self-checking device, adjust automatically power distribution network three-phase load is it is ensured that the three-phrase burden balance of power distribution network.
Technical solution of the present utility model is：A kind of Optimization-type power distribution network three-phase load self-checking device, installs
In three-phase circuit system it is characterised in that：Adjust controller, switching circuitry and by three-phase imbalance including three-phase imbalance
Adjust compensating unit and alternate compensating unit between the line that controller is controlled, between described line, compensating unit is according to transformer capacity
The multiple compensation capacitor groups arranging with the size of three-phase unevenness in power distribution network, each compensating capacitance group includes three single-phase benefits
Repay capacitor, triangle wiring, described alternate compensating unit be according in power distribution network reactive power size setting many
Individual compensation reactor；A phase, B phase and C that described three-phase imbalance adjusts controller and power distribution network are connected, and three-phase imbalance
Adjust controller to be connected with switching circuitry, between described line, compensating unit is all connected with switching circuitry with alternate compensating unit,
One end of three single-phase compensation capacitors in compensating capacitance group in compensating unit between described line through switching circuitry respectively with distribution
The A phase of net, B phase are connected with C, and the other end is connected with the B phase of power distribution network, C phase and A phase respectively, in described alternate compensating unit
Compensation reactor one end be connected with the A phase of power distribution network or B phase or C respectively through switching circuitry, the N all with power distribution network for the other end
Line connects.
Further, above-mentioned Optimization-type power distribution network three-phase load self-checking device, wherein：Described compensation reactor is single
Individual single-phase compensation reactor.
Further, above-mentioned Optimization-type power distribution network three-phase load self-checking device, wherein：Described switching circuitry includes three
Phase three line combination switch and miniature circuit breaker, phase three-wire three combination switch is connected with each compensating capacitance group, and miniature circuit breaker is even
It is connected between each phase of power distribution network and phase three-wire three combination switch.
What this utility model projected has the technical effect that：This utility model is big according to distribution transformer capacity
Little, select compensating unit and alternate compensating unit between the line of phase suitable capacity, and power distribution network is respectively mutually compensated by it is ensured that joining
Alternate balancing the load between each phase of electrical network；And, power distribution network three-phase imbalance adjusting means described in the utility model has logical
With the feature of property, load character and degree of unbalancedness need not be understood during the installation of device, in the situation not changing existing support structures
Under, the capacity of adjusting means is determined according to the capacity of transformator；Additionally, device described in the utility model will after installing
The three-phase and four-line of device is connected with the outfan of distribution transformer, and accesses corresponding current signal, three-phase imbalance
Adjust active power and the reactive power that controller calculates three-phase automatically, automatically thrown according to the size of degree of unbalancedness and reactive power
Cut, select compensating unit and alternate compensating unit between suitable line, there is structure simply, easy for installation, during work, temperature rise is low, damage
Consume low, noiseless feature；In addition；In alternate compensating unit adopt unidirectional reactor, except possess reactive-load compensation effect also
There is the effect reducing power factor it is ensured that the power factor in each phase is less than 1.
Brief description
Fig. 1 is this utility model power distribution network three-phase imbalance adjusting means schematic diagram；
Fig. 2 is access capacitance current vectogram between A phase and B phase.
Fig. 3 is reactive power angle vectogram between A phase and B phase.
Fig. 4 is the FB(flow block) of power distribution network three-phase imbalance adjusting means control method.
In figure, the implication of each reference is：1 three-phase imbalance regulation controller, compensating unit between 2 lines, 3
Alternate compensating unit, 4 switching circuitry, 41 miniature circuit breakers, 42 phase three-wire three combination switches.
Specific embodiment
Combine specific embodiment below by way of accompanying drawing, this utility model is described in further details.
As shown in figure 1, this utility model Optimization-type power distribution network three-phase load self-checking device, it is installed on three-phase circuit system
On system, adjust controller 1, switching circuitry 4 including three-phase imbalance and the line that controlled of controller 1 adjusted by three-phase imbalance
Between compensating unit 2 and alternate compensating unit 3, three in the size of compensating unit 2 distribution transformer capacity and power distribution network between described line
The size of phase unevenness is provided with multiple compensating capacitance groups, and each compensating capacitance group includes three single-phase compensation capacitors, described phase
Between compensating unit 3 multiple compensation reactors are provided with according to the size of reactive power in power distribution network, this compensation capacitor is preferably single
Phase compensation reactor.A phase, B phase and C that described three-phase imbalance adjusts controller 1 and power distribution network are connected, and, three-phase injustice
Weighing apparatus is adjusted controller 1 and is connected with switching circuitry 4, and between described line, compensating unit is all connected with switching circuitry with alternate compensating unit
Connect, so that three-phase imbalance adjusts each switch on-off in controller 1 controlling switch loop 4, select suitable compensation
Capacitance group and compensation reactor, one end of the single-phase compensation capacitor of three in compensating capacitance group in compensating unit 2 between line is through opening
Close loop to be connected with the A phase of power distribution network, B phase and C respectively, the other end is connected with the B phase of power distribution network, C phase and A phase respectively.Phase
Between in compensating unit 3 one end of compensation reactor be connected with the A phase of power distribution network, B phase and C respectively through switching circuitry, the other end
It is connected with the N line of power distribution network.
Further, described switching circuitry 4 includes phase three-wire three combination switch and miniature circuit breaker, and phase three-wire three is combined and opens
Close and be connected with each compensating capacitance group, miniature circuit breaker is connected between each phase of power distribution network and phase three-wire three combination switch, plays
The effect of overcurrent protection.
The control method that this utility model belongs to Optimization-type power distribution network three-phase load self-checking device is as follows, as shown in Figure 4：
Three-phase imbalance adjusts each phase current Ia, Ib, Ic of controller Real-time Collection distribution transformer；Each phase voltage Ua,
Ub、Uc；Each phase active-power P a, Pb, Pc；Each phase reactive power Q a, Qb, Qc；Each phase power factor PFa, PFb, PFc；
（1）Three-phase imbalance adjusts the size that controller judges three phases active power Pa, Pb, Pc, takes out Pmax and Pmin,
Degree of unbalancedness is calculated according to Pun=[(Pmax-Pmin)/Pmax] * 100%, as Pun >=K, starts compensating unit between line, formula
In：Pmax is maximum phase power in three phase power, and Pmin is minimum phase power in three phase power, and Pun is three calculating in real time
Phase unbalanced power degree, the limit value that K sets for unbalance control device, span is between 0-1；
（2）As shown in figure 3, three-phase imbalance regulation controller passes through A, B phase active-power P a, the Pb recording and idle work(
Rate Qa, Qb, then can calculate A phase and B phase reactive power included angle a, φ b respectively, and because A phase active power is 0 ° of Pa ∠, B phase has
Work(power is ∠ -120 ° of Pb, so, Qab side is diagonally ab=120 ° of+φ b- φ a of φ, by calculate A phase and B phase it
Between line between reactive power Q ab, can calculate between the line between B phase and C phase between reactive power Q bc, C phase and A phase in the same manner
Reactive power Q ca between line；
（3）Three-phase imbalance adjusts controller, according to degree of unbalancedness Pun between phase each in power distribution network and A phase and B phase it
Between line between reactive power between the line between reactive power Q bc, C phase and A phase between line between reactive power Q ab, B phase and C phase
Qca, suitably single-phase compensating capacitance group in compensating unit between screening outlet, carry out single compensation balanced action, control and this line
Between compensating capacitance group be connected phase three-wire three combination switch switching, thus be switched on or switched off accordingly single-phase compensate electricity；Three-phase is not
RS485 communication modes are adopted between balance adjustment controller and each phase three-wire three combination switch, so that three-phase imbalance
Adjust controller to control the closure of each phase three-wire three combination switch or open；
（4）Compensating capacitance group work between the line being filtered out, each the single-phase compensating electric capacity arrow in compensating capacitance group between line
Amount is decomposed, and being decomposed into solution is the pure watt current contrary with each phase current of power distribution network and the pure idle electricity vertical with each phase current
Stream, the pure watt current in opposite direction with power distribution network each phase watt current displaced place phase part active power, reach balance
The purpose of load；The pure reactive current vertical with each phase current 90 ° of each phase current in advance, thus it is mutually partly idle to compensate for being located
Power；
（5）Three-phase imbalance adjusts controller and detects each phase power factor PFa, PFb, PFc, when PFa >=1 or PFb >=1,
Or during PFc >=1, start alternate compensating unit, filter out suitably single-phase compensation reactor in alternate compensating unit, compensate
Balance, controls the phase three-wire three combination switch closure that compensating unit alternate with this is connected, thus being switched on or switched off single-phase accordingly
Compensating reactance, repeat the above steps（1）To step（5）, until Pun ＜ K.
Above-mentioned steps（3）Between center line, compensating unit 2 specific works are as follows, as shown in figure 3, the power distribution network in three-phase four-wire system
It is assumed that transformer low voltage output voltage amplitude is equal in network, 120 ° of phase.There are 0 ° of Ua=U ∠, ∠ -120 ° of Ub=U, Uc
120 ° of=U ∠, then have.If Qab is the condenser capacity being added in AB phase.Then for A phase, the capacitance current in AB phase.According to arrow
Mensuration, then Iabq=can be analyzed to pure watt current Iap contrary with A phase current and the pure reactive current vertical with A phase current
Iaq.Vectogram is as shown in Figure 3.As seen from the figure, 180 ° of Iap advanced A phase watt current, in opposite direction with A phase watt current, from
And displaced A phase part active power, reach the purpose of balanced load；90 ° of Iaq advanced A phase current, thus compensate for A phase portion
Divide reactive power.By that analogy, it is connected to each electric capacity in compensating unit 2 between the line in each phase, compensate having in the phase of place
Work(power and reactive power.
In actual use, also can pass through to replace compensation reactor with compensating capacitance group in alternate compensating unit, but,
The electric capacity being connected in compensating unit and alternate compensating unit between line all can raise power factor, uneven in controlling power distribution network three-phase
Weighing apparatus degree reaches《GB》Must assure that while limit value that the power factor in each phase is less than 1, due to being connected on compensating unit between line
All power factor can be raised with the electric capacity in alternate compensating unit it is easy to make certain the phase power factor in power distribution network exceeded,
Therefore, alternate compensating unit adopts unidirectional reactor, unidirectional reactor can play the effect of impedance in circuit, except rising
To outside the effect of reactive-load compensation, go back cpable of lowering power factor it is ensured that each phase power factor is less than 1.
By above description as can be seen that this utility model, according to the size of distribution transformer capacity, selects mutually properly to hold
Compensating unit and alternate compensating unit between the line of amount, and power distribution network is respectively mutually compensated by it is ensured that between each phase of power distribution network
Alternate balancing the load；And, power distribution network three-phase imbalance adjusting means described in the utility model has the characteristics that versatility, device
Installation when need not understand load character and degree of unbalancedness, in the case of not changing existing support structures, according to transformator
Capacity and determine the capacity of adjusting means；Additionally, by the three-phase and four-line of device after device installation described in the utility model
It is connected with the outfan of distribution transformer, and accesses corresponding current signal, it is automatic that three-phase imbalance adjusts controller
Calculate active power and the reactive power of three-phase, according to the size automatic switching of degree of unbalancedness, structure is simple, easy for installation, work
When making, temperature rise is low, and low feature is lost.
Certainly, above simply representative instance of the present utility model, in addition, this utility model can also have other multiple
The technical scheme that specific embodiment, all employing equivalents or equivalent transformation are formed, all falls within this utility model and claims
Within the scope of.
Claims (3)
1. a kind of Optimization-type power distribution network three-phase load self-checking device, be installed in three-phase circuit system it is characterised in that：Bag
Include three-phase imbalance to adjust controller, switching circuitry and adjust compensating unit between the line that controller is controlled by three-phase imbalance
With alternate compensating unit, between described line, compensating unit is the size setting according to three-phase unevenness in transformer capacity and power distribution network
Multiple compensation capacitor groups, each compensating capacitance group includes three single-phase compensation capacitors, triangle wiring, described phase
Between compensating unit be according in power distribution network reactive power size setting multiple compensation reactors；Described three-phase imbalance is adjusted
The A phase of controller and power distribution network, B phase and C are connected, and three-phase imbalance is adjusted controller and is connected with switching circuitry, described
Between line, compensating unit is all connected with switching circuitry with alternate compensating unit, in compensating capacitance group in compensating unit between described line
One end of three single-phase compensation capacitors is connected with the A phase of power distribution network, B phase and C respectively through switching circuitry, the other end respectively with
The B phase of power distribution network, C phase are connected with A phase, the compensation reactor one end in described alternate compensating unit through switching circuitry respectively with join
The A phase of electrical network or B phase or C are connected, and the other end is all connected with the N line of power distribution network.
2. Optimization-type power distribution network three-phase load self-checking device according to claim 1 it is characterised in that：Described compensation
Reactor is single single-phase compensation reactor.
3. Optimization-type power distribution network three-phase load self-checking device according to claim 1 it is characterised in that：Described switch
Loop includes phase three-wire three combination switch and miniature circuit breaker, and phase three-wire three combination switch is connected with each compensating capacitance group, micro-
Type chopper is connected between each phase of power distribution network and phase three-wire three combination switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201620555503.XU CN205960658U (en) | 2016-06-08 | 2016-06-08 | Three phase load automatic regulating apparatus of optimization type distribution network |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620555503.XU CN205960658U (en) | 2016-06-08 | 2016-06-08 | Three phase load automatic regulating apparatus of optimization type distribution network |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932699A (en) * | 2016-06-08 | 2016-09-07 | 江苏盐开电气有限公司 | Optimized power distribution network three-phase load automatic regulating device and control method thereof |
-
2016
- 2016-06-08 CN CN201620555503.XU patent/CN205960658U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932699A (en) * | 2016-06-08 | 2016-09-07 | 江苏盐开电气有限公司 | Optimized power distribution network three-phase load automatic regulating device and control method thereof |
| CN105932699B (en) * | 2016-06-08 | 2018-06-08 | 江苏盐开电气有限公司 | The control method of power distribution network three-phase load |
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