CN104852398B - Three-phase imbalance and low-voltage controlling device, system and compensation loop operation/cutting method - Google Patents
Three-phase imbalance and low-voltage controlling device, system and compensation loop operation/cutting method Download PDFInfo
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- CN104852398B CN104852398B CN201510312236.3A CN201510312236A CN104852398B CN 104852398 B CN104852398 B CN 104852398B CN 201510312236 A CN201510312236 A CN 201510312236A CN 104852398 B CN104852398 B CN 104852398B
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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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- 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
-
- 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
Abstract
The present invention relates to three-phase imbalance and low-voltage controlling device, system and compensation loop operation/cutting method.Three-phase imbalance and low-voltage governing system are included for gathering collecting unit, control unit and the imbalance compensation unit of three-phase current and voltage, imbalance compensation unit includes appointing at least one compensated line being all connected between two-phase, on compensated line, string is provided with imbalance compensation electric capacity and controlling switch, control unit control connection controlling switch.Compensation operation/cutting method includes imbalance compensation electric capacity input method and cutting method, and corresponding compensating electric capacity is put into and cut off by corresponding control mode.Three-phase imbalance and low-voltage controlling device include controller, and above-mentioned imbalance compensation electric capacity input method and/or cutting method are run in controller.In the operation/cutting method that the present invention is provided, capacitor can be quickly and accurately put into or cut off, so as to be effectively improved the power factor of every phase, it is ensured that the stability and reliability of reactive-load compensation.
Description
Technical field
The present invention relates to three-phase imbalance and low-voltage controlling device, system and compensation loop operation/cutting method, belong to electrical network
Reactive-load compensation, three-phase imbalance and low-voltage Treatment process field.
Background technology
With national economy and the high speed development of science and technology, the living standard of resident is quickly improved, various advanced
Modernization household electrical appliance enter into rapidly family, the power load of resident is consequently increased, the household electric used by current resident
Device is very different with what is used in the past, the past be only incandescent lamp, electric cooker, electric frying pan, and be now electricity-saving lamp,
The various household electrical appliance such as refrigerator, range hood, hydraulic pressure TV, air-conditioning, electromagnetic oven, washing machine, from the angle of power load property
Degree says difference substantially, and past electricity consumption is resistive load (power factor：COS Ф=1), and electricity consumption now tends to perception and bears
Lotus (power factor：COSФ≤0.5).This is accomplished by reactive-load compensation with hoisting power factor.
In addition low voltage electric network three-phase imbalance is exactly to perplex one of subject matter of power supply unit always, in the civilian electricity in city
Due to the presence of a large amount of single-phase loads in net and agricultural power network, three alternate current imbalance phenomenons are particularly acute.Three-phase load
Imbalance, gently then reduces the power supplying efficiency of circuit and distribution transformer, heavy then can mutually overload excessively because of heavy load, is likely to result in certain
Phase conductor blows, switch and burn out the single-phase serious consequence such as burn of even distribution transformer.
Three-phase imbalance specifically can cause following impact to circuit or equipment：
1st, line loss and square being directly proportional by electric current.Threephase load is uneven to cause line loss to greatly increase,
If certain phase current is 3A, its aftercurrent is 0, if being evenly distributed to three-phase is changed into every phase 1A, then line loss will be reduced to former line loss
1/3, there is electric current as considered that three-phase imbalance also results in the neutral conductor in addition, make the neutral conductor also produce loss, line loss can decline more
It is many.
2nd, distribution transformer is the power supply main equipment of low voltage electric network, when which is run under threephase load imbalance operating mode,
The increase of distribution loss will be caused because the power attenuation of distribution transforming is when load capacity is identical, its copper loss and iron loss be with not
What the degree of balance was directly proportional.
In addition distribution transformer is run when threephase load is uneven, and the capacity of its output is just unable to reach rated value, its
Spare capacity is also accordingly reduced, and overload capacity is also reduced, and can cause distribution transforming heating even scaling loss when serious.
3rd, distribution transforming is run under threephase load imbalance operating mode, will produce zero-sequence current, and the electric current will be with threephase load not
The degree of balance and change, degree of unbalancedness is bigger, then zero-sequence current is also bigger.
If operating distribution transforming has zero-sequence current, zero sequence fluxes in its iron core, will be produced.(high-pressure side does not have zero sequence electricity
Stream) this forces zero sequence fluxes pass through using oil tank wall and steel beam column as passage, and the permeability of steel beam column is relatively low, zero sequence electricity
When stream is by steel beam column, i.e., magnetic hysteresis and eddy-current loss to be produced, so that the steel beam column local temperature of distribution transforming raises heating.Distribution transforming
Winding insulation accelerate aging because overheated, cause equipment life to reduce.
4th, when threephase load is uneven, each phase output current of distribution transformer is just unequal, and its internal three-phase pressure drop is just not
Equal, this will cause distribution transformer output voltage three-phase imbalance.When threephase load simultaneously is uneven, the neutral conductor just has
Electric current passes through.Thus make the neutral conductor produce impedance voltage drop, so as to cause neutral point drifting, cause each phase phase voltage to change.
One phase voltage of load weight is reduced, and is loaded a light phase voltage and raised, and easily causes high the connect electrical equipment of a phase of voltage
Burn out, and low the connect electrical equipment of a phase of voltage then possibly cannot be used.
Intelligent Reactive Compensating Controller is applied to low-voltage distribution system, can be widely used for outdoor desk-top transformer, interior and matches somebody with somebody
It is automatic that the enterprise such as power station, box-type substation and metallurgy, machinery, mine, railway, chemical industry or low-voltage customer carry out reactive power
Tracing compensation is controlled.Controller is mainly used for the switching for controlling capacitor bank, compensates control to the reactive power of electrical network,
To reach the purposes such as the load capacity for improving power factor and improving transformer.Control mode be generally divided into three-phase total compensation type, three
Phase point apotype, three-phase total compensation+point three kinds of mixed type of benefit.Such as Application No. 02256020.3, utility model is entitled《Intellectual phase separate switching
Capacitance compensation power distribution equipment》Chinese patent application file, it discloses a kind of reactive power compensator, sampling unit collection three-phase
Electric current and voltage and will collection information output to control unit, control unit makes reactive-load compensation according to the information for receiving
Judge, then control corresponding capacitor switching.This application does not provide a kind of effective reactive power compensator, and it is not
Three-phase imbalance and low-voltage can be solved the problems, such as.
The content of the invention
It is an object of the invention to provide three-phase imbalance and low-voltage governing system and compensation loop operation/cutting method, to enter
Row reactive-load compensation, three-phase imbalance and low-voltage are administered.Present invention simultaneously provides a kind of three-phase imbalance and low-voltage administer dress
Put.
For achieving the above object, the solution of the present invention includes that a kind of reactive-load compensation, three-phase imbalance and low-voltage administer system
System, including for gathering collecting unit, control unit and the imbalance compensation unit of three-phase current and voltage, the imbalance is mended
Repaying unit includes appointing at least one compensated line that is all connected between two-phase, on compensated line string be provided with imbalance compensation electric capacity and
Controlling switch；The described control unit control connection controlling switch.
Two compensated lines are respectively connected between described two-phase.
The reactive-load compensation, three-phase imbalance and low-voltage governing system also include phase splitting compensation unit, and the split-phase is mended
Repaying unit includes several phase splitting compensation electric capacity.
A kind of imbalance compensation electric capacity input side of above-mentioned reactive-load compensation, three-phase imbalance and low-voltage governing system
Method, appoints the compensated line connected between two-phase to include the first compensated line, the imbalance compensation electricity concatenated on the first compensated line
Hold for the first imbalance compensation electric capacity, the input method the step of be：
1) control unit gathers corresponding electric current and voltage：
2) according to the electric current and voltage that collect, control unit judges whether following three condition is set up：
1., the difference of the watt current of the watt current and leading phase of delayed phase is more than the first setting value,
2., it is delayed mutually put into the first imbalance compensation electric capacity after, the power factor of the delayed phase is less than 1,
3., after, leading phase puts into the first imbalance compensation electric capacity, the power factor of the leading phase is less than 1,
If 3) above three condition is set up, control input the first imbalance compensation electric capacity.
The compensated line connected between described two-phase also includes the second compensated line, concatenates on second compensated line
Imbalance compensation electric capacity be the second imbalance compensation electric capacity；After the first imbalance compensation electric capacity is put into, judge as follows
Whether three conditions are set up：
1., the difference of the watt current of the watt current and leading phase of delayed phase is more than the second setting value,
2., it is delayed mutually put into the second imbalance compensation electric capacity after, the power factor of the delayed phase is less than 1,
3., after, leading phase puts into the second imbalance compensation electric capacity, the power factor of the leading phase is less than 1；
If above three condition is set up, control input the second imbalance compensation electric capacity.
First setting value is the rated capacity of 1.5 times of the first imbalance compensation electric capacity.
Second setting value is the rated capacity of 1.5 times of the first imbalance compensation electric capacity.
A kind of imbalance compensation electric capacity for being exclusively used in above-mentioned reactive-load compensation, three-phase imbalance and low-voltage governing system is cut
Except method, the compensated line connected between two-phase is appointed to include the first compensated line, the uneven benefit concatenated on the first compensated line
Electric capacity is repaid for the first imbalance compensation electric capacity；The imbalance compensation electric capacity cutting method includes following two steps：
Step one：When the watt current of leading phase is more than the first setting value with the difference of the watt current of delayed phase, cut
Except the first imbalance compensation electric capacity；
Step 2：The step is divided into following three kinds of situations：
If cos is ψA=1 or for negative value when：Relatively IB-IAWith IA-ICSize：Such as IB-IA﹥ IA-IC, then first cut off CA3,
After cut off CC3；Such as IB-IA＜ IA-IC, then first cut off CC3, C is cut off afterwardsA3；
If cos is ψB=1 or for negative value when：Relatively IB-IAWith IC-IBSize：Such as IB-IA﹥ IC-IB, then first cut off CA3,
After cut off CB3；Such as IB-IA＜ IC-IB, then first cut off CB3, C is cut off afterwardsA3；
If cos is ψC=1 or for negative value when：Relatively IA-ICWith IC-IBSize：Such as IA-IC﹥ IC-IB, then first cut off CA3,
After cut off CB3；Such as IA-IC＜ IC-IB, then first cut off CB3, C is cut off afterwardsA3；
Wherein, cos ψAIt is the power factor of A phases, cos ψBIt is the power factor of B phases, cos ψCIt is the power factor of C phases, IA
It is the watt current of A phases, IBIt is the watt current of B phases, ICIt is the watt current of C phases, CA3It is the compensating line between A phases and B phases
The first imbalance compensation electric capacity on road, CB3It is the first imbalance compensation electric capacity on the compensated line between B phases and C phases, CC3
It is the first imbalance compensation electric capacity on the compensated line between C phases and A phases.
The compensated line connected between described two-phase also includes the second compensated line, concatenates on second compensated line
Imbalance compensation electric capacity be the second imbalance compensation electric capacity；
In the step one：When cut off the first imbalance compensation electric capacity after, judge the watt current of leading phase with it is stagnant
When whether the difference of the watt current of phase is more than the second setting value afterwards, if greater than, then excision second imbalance compensation
Electric capacity；
In the step 2：
If the cos ψA=1 or for negative value when：Relatively IB-IAWith IA-ICSize：Such as IB-IA﹥ IA-IC, then first cut off
CA3、CA4, C is cut off afterwardsC3、CC4；Such as IB-IA＜ IA-IC, then first cut off CC3、CC4, C is cut off afterwardsA3、CA4；
If the cos ψB=1 or for negative value when：Relatively IB-IAWith IC-IBSize：Such as IB-IA﹥ IC-IB, then first cut off
CA3、CA4, C is cut off afterwardsB3、CB4；Such as IB-IA＜ IC-IB, then first cut off CB3、CB4, C is cut off afterwardsA3、CA4；
If the cos ψC=1 or for negative value when：Relatively IA-ICWith IC-IBSize：Such as IA-IC﹥ IC-IB, then first cut off
CA3、CA4, C is cut off afterwardsB3、CB4；Such as IA-IC＜ IC-IB, then first cut off CB3、CB4, C is cut off afterwardsA3、CA4；
Wherein, CA4It is the second imbalance compensation electric capacity on the compensated line between A phases and B phases, CB4Be B phases and C phases it
Between compensated line on the second imbalance compensation electric capacity, CC4It is the second uneven benefit on the compensated line between C phases and A phases
Repay electric capacity.
A kind of reactive-load compensation, three-phase imbalance and low-voltage controlling device, including controller, the controller operation are uneven
Weighing apparatus compensating electric capacity input method and/or imbalance compensation electric capacity cutting method；The imbalance compensation electric capacity puts into the step of method
Suddenly it is：
1) control unit gathers corresponding electric current and voltage：
2) according to the electric current and voltage that collect, control unit judges whether following three condition is set up：
1., the difference of the watt current of the watt current and leading phase of delayed phase is more than the first setting value,
2., it is delayed mutually put into the first imbalance compensation electric capacity after, the power factor of the delayed phase is less than 1,
3., after, leading phase puts into the first imbalance compensation electric capacity, the power factor of the leading phase is less than 1,
If 3) above three condition is set up, control input the first imbalance compensation electric capacity；
The step of imbalance compensation electric capacity cutting method is：
Step one：When the watt current of leading phase is more than the first setting value with the difference of the watt current of delayed phase, cut
Except the first imbalance compensation electric capacity；
Step 2：The step is divided into following three kinds of situations：
If cos is ψA=1 or for negative value when：Relatively IB-IAWith IA-ICSize：Such as IB-IA﹥ IA-IC, then first cut off CA3,
After cut off CC3；Such as IB-IA＜ IA-IC, then first cut off CC3, C is cut off afterwardsA3；
If cos is ψB=1 or for negative value when：Relatively IB-IAWith IC-IBSize：Such as IB-IA﹥ IC-IB, then first cut off CA3,
After cut off CB3；Such as IB-IA＜ IC-IB, then first cut off CB3, C is cut off afterwardsA3；
If cos is ψC=1 or for negative value when：Relatively IA-ICWith IC-IBSize：Such as IA-IC﹥ IC-IB, then first cut off CA3,
After cut off CB3；Such as IA-IC＜ IC-IB, then first cut off CB3, C is cut off afterwardsA3；
Wherein, cos ψAIt is the power factor of A phases, cos ψBIt is the power factor of B phases, cos ψCIt is the power factor of C phases, IA
It is the watt current of A phases, IBIt is the watt current of B phases, ICIt is the watt current of C phases, CA3It is the compensating line between A phases and B phases
The first imbalance compensation electric capacity on road, CB3It is the first imbalance compensation electric capacity on the compensated line between B phases and C phases, CC3
It is the first imbalance compensation electric capacity on the compensated line between C phases and A phases.
The invention provides a kind of more novel three-phase imbalance and low-voltage controlling device, system and uneven benefit
Repay electric capacity input and the method for cutting off, the system include for gather the collecting unit of three-phase current and voltage, control unit and
Imbalance compensation unit, imbalance compensation unit include appointing at least one compensated line being all connected between two-phase, compensated line
Upper string is provided with imbalance compensation electric capacity and controlling switch, control unit control connection controlling switch.
By comparing the specific relation between the watt current for appointing two-phase, then put into after other two conditions are met
Imbalance compensation electric capacity on the line of the two-phase, can quickly and accurately put into capacitor, so as to be effectively improved the work(of every phase
Rate factor, improvement degree of unbalancedness between phase and phase, and the phase voltage of every phase can be lifted, and ensure the stability and reliability of compensation
Property.Realize to the optimal compensation in three-phase per phase reactive power, low-voltage and three-phase imbalance.
When electric capacity is cut off, a condition is to carry out judgement according to the corresponding relation between three-phase watt current to cut
Remove, another condition is to carry out judgement excision according to three-phase activity coefficient, the two conditions be or relation, as long as have one it is full
Sufficient condition can cut off corresponding electric capacity, so this cutting method can effectively and quickly carry out electric capacity excision, it is ensured that work(
Rate it is steady, it is to avoid cross situation about mending.
The present invention provide three-phase imbalance and low-voltage controlling device, system can be individually used for compensating reactive power, also can be single
It is solely used in three-phase load unbalance and low-voltage is administered, also can uses cooperatively for two or three.The three-phase that the present invention is provided is uneven
The Main Function of weighing apparatus and low-voltage controlling device, system and compensation loop operation/cutting method is as follows：
1) reduce the electric energy loss of circuit；
2) reduce the electric energy loss of distribution transformer, improve transformer capacity utilization rate, reduce the maintenance cost of power distribution network；
3) transformer zero-sequence current is reduced, improves power supply unit service life, lift economic interests；
4) line electricity pressure drop and unbalanced source voltage degree are reduced, so as to improve the quality of power supply, electrical equipment safety is released
Hidden danger.
Description of the drawings
Fig. 1 be electric capacity and three-phase line for phase splitting compensation in imbalance compensation capacitor switching method embodiment 1 it
Between annexation figure；
Fig. 2 is the electric capacity and three-phase line for imbalance compensation in imbalance compensation capacitor switching method embodiment 1
Between annexation figure；
Fig. 3 is the annexation figure between controller and IGCT in imbalance compensation capacitor switching method embodiment 1；
Fig. 4 is the structure chart of the three-phase imbalance controller in imbalance compensation capacitor switching method embodiment 1；
Fig. 5 is annexation figure between electric capacity and three-phase line in imbalance compensation capacitor switching method embodiment 2；
Fig. 6 is the annexation figure between controller and IGCT in imbalance compensation capacitor switching method embodiment 2.
Specific embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings.
Imbalance compensation capacitor switching method embodiment 1
As shown in figure 1, being the annexation figure between the electric capacity and three-phase line for phase splitting compensation.In A phases and zero line
Between have two connection lines, IGCT TSC-1 and electric capacity have been sequentially connected in series on a circuit, have been sequentially connected in series on another circuit
There are IGCT TSC-2 and electric capacity；There are two connection lines between B phases and zero line, on a circuit, be sequentially connected in series IGCT
TSC-3 and electric capacity, have been sequentially connected in series IGCT TSC-4 and electric capacity on another circuit；There are two connections between C phases and zero line
Circuit, has been sequentially connected in series IGCT TSC-5 and electric capacity, has been sequentially connected in series IGCT TSC-6 on another circuit on a circuit
And electric capacity.As shown in Fig. 2 being annexation figure between the electric capacity and three-phase line for imbalance compensation.A phases and B phases it
Between have two compensated lines, IGCT TSC-7 and electric capacity have been sequentially connected in series on a circuit, have been sequentially connected in series on another circuit
IGCT TSC-8 and electric capacity；There are two compensated lines between B phases and C phases, on a circuit, be sequentially connected in series IGCT TSC-
9 and electric capacity, IGCT TSC-10 and electric capacity have been sequentially connected in series on another circuit；There are two compensating lines between C phases and A phases
Road, has been sequentially connected in series IGCT TSC-11 and electric capacity, has been sequentially connected in series IGCT TSC-12 on another circuit on a circuit
And electric capacity.
Three-phase imbalance low-voltage governing system is included for gathering the collecting unit of three-phase current and voltage, controlling list
Unit, imbalance compensation unit and phase splitting compensation unit, collecting unit is using collection three-phase current of the prior art and voltage
Device, such as：Collection electric current uses current transformer, and collection voltages are then directly connected to collection circuit on three-phase line
, the collection signal input part of collecting unit connection control unit.Imbalance compensation unit includes that mentioned above 6 compensate
Circuit, has two compensated lines between every two-phase, as shown in figure 3, imbalance compensation unit includes 6 electric capacity and 6 IGCTs.
Control unit is three-phase imbalance controller, and the control signal output of three-phase imbalance controller connects all of IGCT.
It is illustrated in figure 4 the structure chart of three-phase imbalance controller.A3, A4, B3, B4 on three-phase imbalance controller,
The corresponding electric capacity of C3, C4 lead-out terminal is used for active imbalance compensation；A1 and A2 lead-out terminals on three-phase imbalance controller
Corresponding electric capacity is used for A phase power factor phase splitting compensations, and the corresponding electric capacity of B1 and B2 is used for B phase power factor phase splitting compensations, C1
It is used for C phase power factor phase splitting compensations with the corresponding electric capacity of C2.This 6 terminal functions of A1, A2, B1, B2, C1 and C2 and existing skill
The terminal function of the controller control phase splitting compensation in art is identical.Unlike the prior art, preferential switching A3 during compensation,
A4、B3、B4、C3、C4。
The compensation of pre-emptive power factor when unbalanced power is compensated.
First, set default objects power-factor cos ψTarget.The connect electric capacity of setting A3, A4, B3, B4, C3, C4 is respectively
CA3、CA4、CB3、CB4、CC3、CC4, corresponding rated capacity is respectively SA3、SA4、SB3、SB4、SC3、SC4, setting accuracy is less than
1kvar。
Context between A, B, C three-phase is：120 DEG C of the advanced A phases of B phases, 120 DEG C of the advanced B phases of C phases, the advanced C phases of A phases
120℃.If A, B, C three-phase watt current size is respectively IA、IB、ICIf A, B, C three-phase activity coefficient is respectively cos ψA、cos
ψB、cosψC。
The control method of reactive-load compensation is：
C is controlled firstA3、CA4、CB3、CB4、CC3、CC4Input, be divided into three kinds of situations：Control CA3、CA4Input, control
CB3、CB4Input, control CC3、CC4Input.
The first, controls CA3、CA4Input
Detection A phases and B phase watt current sizes；
Controller judges whether three below condition is set up：
Condition is 1.：IA﹥ IB+1.5SA3；
Condition is 2.：A phases put into CA3Cos ψ afterwardsA﹤ 1 is (if A phases put into CA3Cos ψ afterwardsA﹤ 1 is unsatisfactory for, and now A1, A2 institute
Connect electric capacity to put into, now as electric capacity that A1, A2 connect is closed, cos ψA﹤ 1 meets, then A1, A2 connect electric capacity is closed, so
Backsight is met for the condition)；
Condition is 3.：B phases put into CA3Cos ψ afterwardsB﹤ 1 is (if B phases put into CA3Cos ψ afterwardsB﹤ 1 is unsatisfactory for, and now B1, B2 institute
Connect electric capacity to put into, now as electric capacity that B1, B2 connect is closed, cos ψB﹤ 1 meets, then B1, B2 connect electric capacity is closed, so
Backsight is met for the condition)；
If above three condition meets simultaneously, the A3 terminals output high level signal 1 of controller, turn on thyristors,
C is put intoA3；Otherwise, as long as there is 1 condition to be unsatisfactory in above three condition, the A3 terminals of controller are believed for low level always
Number 0, IGCT disconnects, i.e., do not put into CA3。
In CA3After input, controller judges whether three below condition is set up：
Condition is 1.：IA﹥ IB+1.5SA3；
Condition is 2.：A phases put into CA4Cos ψ afterwardsA﹤ 1 is (if A phases put into CA4Cos ψ afterwardsA﹤ 1 is unsatisfactory for, and now A1, A2 institute
Connect electric capacity to put into, now as electric capacity that A1, A2 connect is closed, cos ψA﹤ 1 meets, then A1, A2 connect electric capacity is closed, so
Backsight is met for the condition)；
Condition is 3.：B phases put into CA4Cos ψ afterwardsB﹤ 1 is (if B phases put into CA4Cos ψ afterwardsB﹤ 1 is unsatisfactory for, and now B1, B2 institute
Connect electric capacity to put into, now as electric capacity that B1, B2 connect is closed, cos ψB﹤ 1 meets, then B1, B2 connect electric capacity is closed, so
Backsight is met for the condition)；
If above three condition meets simultaneously, the A4 terminals output high level signal 1 of controller, turn on thyristors,
C is put intoA4；Otherwise, as long as there is 1 condition to be unsatisfactory in above three condition, the A4 terminals of controller are believed for low level always
Number 0, IGCT disconnects, i.e., do not put into CA4。
Second, control CB3、CB4Input
Detection B phases and C phase watt current sizes；
Controller judges whether three below condition is set up：
Condition is 1.：IB﹥ IC+1.5SB3；
Condition is 2.：B phases put into CB3Cos ψ afterwardsB﹤ 1 is (if B phases put into CB3Cos ψ afterwardsB﹤ 1 is unsatisfactory for, and now B1, B2 institute
Connect electric capacity to put into, now as electric capacity that B1, B2 connect is closed, cos ψB﹤ 1 meets, then B1, B2 connect electric capacity is closed, so
Backsight is met for the condition)；
Condition is 3.：C phases put into CB3Cos ψ afterwardsC﹤ 1 is (if C phases put into CB3Cos ψ afterwardsC﹤ 1 is unsatisfactory for, and now C1, C2 institute
Connect electric capacity to put into, now as electric capacity that C1, C2 connect is closed, cos ψC﹤ 1 meets, then C1, C2 connect electric capacity is closed, so
Backsight is met for the condition)；
If above three condition meets simultaneously, the B3 terminals output high level signal 1 of controller, turn on thyristors,
C is put intoB3；Otherwise, as long as there is 1 condition to be unsatisfactory in above three condition, the B3 terminals of controller are believed for low level always
Number 0, IGCT disconnects, i.e., do not put into CB3。
In CB3After input, controller judges whether three below condition is set up：
Condition is 1.：IB﹥ IC+1.5SB3；
Condition is 2.：B phases put into CB4Cos ψ afterwardsB﹤ 1 is (if B phases put into CB4Cos ψ afterwardsB﹤ 1 is unsatisfactory for, and now B1, B2 institute
Connect electric capacity to put into, now as electric capacity that B1, B2 connect is closed, cos ψB﹤ 1 meets, then B1, B2 connect electric capacity is closed, so
Backsight is met for the condition)；
Condition is 3.：C phases put into CB4Cos ψ afterwardsC﹤ 1 is (if C phases put into CB4Cos ψ afterwardsC﹤ 1 is unsatisfactory for, and now C1, C2 institute
Connect electric capacity to put into, now as electric capacity that C1, C2 connect is closed, cos ψC﹤ 1 meets, then C1, C2 connect electric capacity is closed, so
Backsight is met for the condition)；
If above three condition meets simultaneously, the B4 terminals output high level signal 1 of controller, turn on thyristors,
C is put intoB4；Otherwise, as long as there is 1 condition to be unsatisfactory in above three condition, the B4 terminals of controller are believed for low level always
Number 0, IGCT disconnects, i.e., do not put into CB4。
The third, controls CC3、CC4Input
Detection C phases and A phase watt current sizes；
Controller judges whether three below condition is set up：
Condition is 1.：IC﹥ IA+1.5SC3；
Condition is 2.：C phases put into CC3Cos ψ afterwardsC﹤ 1 is (if C phases put into CC3Cos ψ afterwardsC﹤ 1 is unsatisfactory for, and now C1, C2 institute
Connect electric capacity to put into, now as electric capacity that C1, C2 connect is closed, cos ψC﹤ 1 meets, then C1, C2 connect electric capacity is closed, so
Backsight is met for the condition)；
Condition is 3.：A phases put into CC3Cos ψ afterwardsA﹤ 1 is (if A phases put into CC3Cos ψ afterwardsA﹤ 1 is unsatisfactory for, and now A1, A2 institute
Connect electric capacity to put into, now as electric capacity that A1, A2 connect is closed, cos ψA﹤ 1 meets, then A1, A2 connect electric capacity is closed, so
Backsight is met for the condition)；
If above three condition meets simultaneously, the C3 terminals output high level signal 1 of controller, turn on thyristors,
C is put intoC3；Otherwise, as long as there is 1 condition to be unsatisfactory in above three condition, the C3 terminals of controller are believed for low level always
Number 0, IGCT disconnects, i.e., do not put into CC3。
In CC3After input, controller judges whether three below condition is set up：
Condition is 1.：IC﹥ IA+1.5SC3；
Condition is 2.：C phases put into CC4Cos ψ afterwardsC﹤ 1 is (if C phases put into CC4Cos ψ afterwardsC﹤ 1 is unsatisfactory for, and now C1, C2 institute
Connect electric capacity to put into, now as electric capacity that C1, C2 connect is closed, cos ψC﹤ 1 meets, then C1, C2 connect electric capacity is closed, so
Backsight is met for the condition)；
Condition is 3.：A phases put into CC4Cos ψ afterwardsA﹤ 1 is (if A phases put into CC4Cos ψ afterwardsA﹤ 1 is unsatisfactory for, and now A1, A2 institute
Connect electric capacity to put into, now as electric capacity that A1, A2 connect is closed, cos ψA﹤ 1 meets, then A1, A2 connect electric capacity is closed, so
Backsight is met for the condition)；
If above three condition meets simultaneously, the C4 terminals output high level signal 1 of controller, turn on thyristors,
C is put intoC4；Otherwise, as long as there is 1 condition to be unsatisfactory in above three condition, the C4 terminals of controller are believed for low level always
Number 0, IGCT disconnects, i.e., do not put into CC4。
If CA3、CA4、CB3、CB4、CC3、CC4After electric capacity input, power factor is still below desired value, then, then mend by split-phase
Repay the switching that strategy processes the connect electric capacity of terminal A1, A2, B1, B2, C1, C2.This belongs to phase splitting compensation of the prior art, here
Do not repeat.
As control CA3、CA4、CB3、CB4、CC3、CC4Excision when, be divided into two steps, wherein step one is that had according to three-phase
Corresponding relation between work(electric current is judged that step 2 is judged according to three-phase activity coefficient.If step one can
Realize the excision of electric capacity, then just without the need for step 2；If step one can not realize the excision of electric capacity, then, it is necessary to step
Two continuation judgements is cut off, that is to say, that step one and step 2 be or logical relation.And, step one and step 2
Between there is no strict context, two steps tandem can exchange.
When being judged according to the corresponding relation between three-phase watt current, three kinds of situations are also classified into：Control CA3、CA4
Excision, control CB3、CB4Excision, control CC3、CC4Excision.
Control CA3、CA4Excision：
Controller judges IB﹥ IA+1.5SA3Whether set up；If set up, C is now cut offA3, i.e. A3 terminals are output as 0；Cut
Except CA3After judge IB﹥ IA+1.5SA4Whether set up, if set up, now cut off CA4, i.e. A4 terminals are output as 0.
Control CB3、CB4Excision：
Controller judges IC﹥ IB+1.5SB3Whether set up；If set up, C is now cut offB3, i.e. B3 terminals are output as 0；Cut
Except CB3After judge IC﹥ IB+1.5SB4Whether set up, if set up, now cut off CB4, i.e. B4 terminals are output as 0.
Control CC3、CC4Excision：
Controller judges IA﹥ IC+1.5SC3Whether set up；If set up, C is now cut offC3, i.e. C3 terminals are output as 0；Cut
Except CC3After judge IA﹥ IC+1.5SC4Whether set up, if set up, now cut off CC4, i.e. C4 terminals are output as 0.
When being judged according to three-phase activity coefficient, i.e., whether there is the excision for covering row electric capacity according to every phase in three-phase
Judge, be divided into following three kinds of situations：
First, cos ψ are detectedA：
If cos is ψA=1 or for negative value when：The connect electric capacity of process A1 and A2 is mended by point, after the connect electric capacity of excision A1 and A2,
Cos ψ are judged againABe whether 1 or for negative value (if in reactive-load compensation, not carrying out phase splitting compensation, then, avoid the need for
This step), if cos is ψA=1 or for negative value when, be handled as follows：Relatively IB-IAWith IA-ICSize：
Such as IB-IA﹥ IA-IC(considering positive and negative), then first cut off CA3、CA4, C is cut off afterwardsC3、CC4；Such as IB-IA＜ IA-IC(consider
It is positive and negative), then first cut off CC3、CC4, C is cut off afterwardsA3、CA4, till only mending.One group of electric capacity is often cut off during excision just to be needed
I to be comparedB-IAWith IA-ICSize once, then according to result judgement excision priority.
2nd, cos ψ are detectedB：
If cos is ψB=1 or for negative value when, process the connect electric capacity of B1 and B2 by point mending, after cutting off the connect electric capacity of B1 and B2,
Cos ψ are judged againBBe whether 1 or for negative value (if in reactive-load compensation, not carrying out phase splitting compensation, then, avoid the need for
This step), if cos is ψB=1 or for negative value when, be handled as follows：Relatively IB-IAWith IC-IBSize：
Such as IB-IA﹥ IC-IB(considering positive and negative), then first cut off CA3、CA4, C is cut off afterwardsB3、CB4；Such as IB-IA＜ IC-IB(consider
It is positive and negative), then first cut off CB3、CB4, C is cut off afterwardsA3、CA4, till only mending.One group of electric capacity is often cut off during excision just to be needed
I to be comparedB-IAWith IC-IBSize once, then according to result judgement excision priority.
3rd, cos ψ are detectedC：
If cos is ψC=1 or for negative value when, process the connect electric capacity of C1 and C2 by point mending, after cutting off the connect electric capacity of C1 and C2,
Cos ψ are judged againCBe whether 1 or for negative value (if in reactive-load compensation, not carrying out phase splitting compensation, then, avoid the need for
This step), if cos is ψC=1 or for negative value when, be handled as follows：Relatively IA-ICWith IC-IBSize：
Such as IA-IC﹥ IC-IB(considering positive and negative), then first cut off CA3、CA4, C is cut off afterwardsB3、CB4；Such as IA-IC＜ IC-IB(consider
It is positive and negative), then first cut off CB3、CB4, C is cut off afterwardsA3、CA4, till only mending.One group of electric capacity is often cut off during excision just to be needed
I to be comparedA-ICWith IC-IBSize once, then according to result judgement excision priority.
In above-described embodiment, reactive power compensator includes phase splitting compensation unit, can not complete idle in imbalance compensation
During compensation, then phase splitting compensation is carried out, the phase splitting compensation belongs to prior art.As other embodiments, in imbalance compensation energy
When enough completing idle compensation, the reactive power compensator can no phase splitting compensation unit.
In above-described embodiment, controlling switch is IGCT, the break-make of controller control IGCT to realize the switching of electric capacity,
Used as other embodiments, controlling switch can also be other on-off switches, such as：Relay, the contact of relay with
Capacitances in series, the coil of controller control connection relay, the coil of relay obtain electric or dead electricity correspondingly control relay
Contact conducting or turn off.
Imbalance compensation capacitor switching method embodiment 2
The present embodiment with the difference of above-mentioned imbalance compensation capacitor switching method embodiment 1 is：Phase and phase in embodiment 1
Between have two compensated lines, every compensated line is serially connected with IGCT and electric capacity, and when the input of electric capacity is carried out, two are electric
Hold the control for needing successively to be put into, and in the present embodiment, only one compensated line, goes here and there on this circuit between phase and phase
IGCT and electric capacity are connected to, when the input of electric capacity is carried out, an input control is only needed.Wherein, electric capacity and three-phase line
Between annexation as shown in figure 5, the annexation between controller and electric capacity is as shown in Figure 6.
Imbalance compensation capacitor switching method is specific as follows：
The corresponding electric capacity of A3, B3, C3 lead-out terminal on three-phase imbalance controller is used for active imbalance compensation.Due to
Phase splitting compensation is not the emphasis of the present embodiment, in the same manner as in Example 1 here.
First, set default objects power-factor cos ψTarget.The connect electric capacity of setting A3, B3, C3 is respectively CA3、CB3、CC3,
Corresponding rated capacity is respectively SA3、SB3、SC3, setting accuracy is less than 1kvar.
Context between A, B, C three-phase is：120 DEG C of the advanced A phases of B phases, 120 DEG C of the advanced B phases of C phases, the advanced C phases of A phases
120℃.If A, B, C three-phase watt current size is respectively IA、IB、ICIf A, B, C three-phase activity coefficient is respectively cos ψA、cos
ψB、cosψC。
The control method of reactive-load compensation is：
C is controlled firstA3、CB3、CC3Input, be divided into three kinds of situations：Control CA3Input, control CB3Input, control
CC3Input.
The first, controls CA3Input
Detection A phases and B phase watt current sizes；
Controller judges whether three below condition is set up：
Condition is 1.：IA﹥ IB+1.5SA3；
Condition is 2.：A phases put into CA3Cos ψ afterwardsA﹤ 1 is (if A phases put into CA3Cos ψ afterwardsA﹤ 1 is unsatisfactory for, and now A1, A2 institute
Connect electric capacity to put into, now as electric capacity that A1, A2 connect is closed, cos ψA﹤ 1 meets, then A1, A2 connect electric capacity is closed, so
Backsight is met for the condition)；
Condition is 3.：B phases put into CA3Cos ψ afterwardsB﹤ 1 is (if B phases put into CA3Cos ψ afterwardsB﹤ 1 is unsatisfactory for, and now B1, B2 institute
Connect electric capacity to put into, now as electric capacity that B1, B2 connect is closed, cos ψB﹤ 1 meets, then B1, B2 connect electric capacity is closed, so
Backsight is met for the condition)；
If above three condition meets simultaneously, the A3 terminals output high level signal 1 of controller, turn on thyristors,
C is put intoA3；Otherwise, as long as there is 1 condition to be unsatisfactory in above three condition, the A3 terminals of controller are believed for low level always
Number 0, IGCT disconnects, i.e., do not put into CA3。
Second, control CB3Input
Detection B phases and C phase watt current sizes；
Controller judges whether three below condition is set up：
Condition is 1.：IB﹥ IC+1.5SB3；
Condition is 2.：B phases put into CB3Cos ψ afterwardsB﹤ 1 is (if B phases put into CB3Cos ψ afterwardsB﹤ 1 is unsatisfactory for, and now B1, B2 institute
Connect electric capacity to put into, now as electric capacity that B1, B2 connect is closed, cos ψB﹤ 1 meets, then B1, B2 connect electric capacity is closed, so
Backsight is met for the condition)；
Condition is 3.：C phases put into CB3Cos ψ afterwardsC﹤ 1 is (if C phases put into CB3Cos ψ afterwardsC﹤ 1 is unsatisfactory for, and now C1, C2 institute
Connect electric capacity to put into, now as electric capacity that C1, C2 connect is closed, cos ψC﹤ 1 meets, then C1, C2 connect electric capacity is closed, so
Backsight is met for the condition)；
If above three condition meets simultaneously, the B3 terminals output high level signal 1 of controller, turn on thyristors,
C is put intoB3；Otherwise, as long as there is 1 condition to be unsatisfactory in above three condition, the B3 terminals of controller are believed for low level always
Number 0, IGCT disconnects, i.e., do not put into CB3。
The third, controls CC3Input
Detection C phases and A phase watt current sizes；
Controller judges whether three below condition is set up：
Condition is 1.：IC﹥ IA+1.5SC3；
Condition is 2.：C phases put into CC3Cos ψ afterwardsC﹤ 1 is (if C phases put into CC3Cos ψ afterwardsC﹤ 1 is unsatisfactory for, and now C1, C2 institute
Connect electric capacity to put into, now as electric capacity that C1, C2 connect is closed, cos ψC﹤ 1 meets, then C1, C2 connect electric capacity is closed, so
Backsight is met for the condition)；
Condition is 3.：A phases put into CC3Cos ψ afterwardsA﹤ 1 is (if A phases put into CC3Cos ψ afterwardsA﹤ 1 is unsatisfactory for, and now A1, A2 institute
Connect electric capacity to put into, now as electric capacity that A1, A2 connect is closed, cos ψA﹤ 1 meets, then A1, A2 connect electric capacity is closed, so
Backsight is met for the condition)；
If above three condition meets simultaneously, the C3 terminals output high level signal 1 of controller, turn on thyristors,
C is put intoC3；Otherwise, as long as there is 1 condition to be unsatisfactory in above three condition, the C3 terminals of controller are believed for low level always
Number 0, IGCT disconnects, i.e., do not put into CC3。
If CA3、CB3、CC3After electric capacity input, power factor is still below desired value, then, then by the process of phase splitting compensation strategy
The switching of the connect electric capacity of terminal A1, A2, B1, B2, C1, C2.This belongs to phase splitting compensation of the prior art, does not repeat here.
As control CA3、CB3、CC3Excision when, be divided into two steps, wherein step one is according between three-phase watt current
Corresponding relation judged that step 2 is judged according to three-phase activity coefficient.If step one can realize electric capacity
Excision, then just without the need for step 2；If step one can not realize the excision of electric capacity, then, it is necessary to step 2 continues to judge
Cut off, that is to say, that step one and step 2 be or logical relation.And, without tight between step one and step 2
The context of lattice, the tandem of two steps can be exchanged.
When being judged according to the corresponding relation between three-phase watt current, three kinds of situations are also classified into：Control CA3Cut
Except, control CB3Excision, control CC3Excision.
Control CA3Excision：
Controller judges IB﹥ IA+1.5SA3Whether set up；If set up, C is now cut offA3, i.e. A3 terminals are output as 0.
Control CB3Excision：
Controller judges IC﹥ IB+1.5SB3Whether set up；If set up, C is now cut offB3, i.e. B3 terminals are output as 0.
Control CC3Excision：
Controller judges IA﹥ IC+1.5SC3Whether set up；If set up, C is now cut offC3, i.e. C3 terminals are output as 0.
When being judged according to three-phase activity coefficient, i.e., whether there is the excision for covering row electric capacity according to every phase in three-phase
Judge, be divided into following three kinds of situations：
First, cos ψ are detectedA：
If cos is ψA=1 or for negative value when：The connect electric capacity of process A1 and A2 is mended by point, after the connect electric capacity of excision A1 and A2,
Cos ψ are judged againABe whether 1 or for negative value (if in reactive-load compensation, not carrying out phase splitting compensation, then, avoid the need for
This step), if cos is ψA=1 or for negative value when, be handled as follows：Relatively IB-IAWith IA-ICSize：
Such as IB-IA﹥ IA-IC(considering positive and negative), then first cut off CA3, C is cut off afterwardsC3；Such as IB-IA＜ IA-IC(considering positive and negative), then
C is cut off firstC3, C is cut off afterwardsA3, till only mending.Often cut off one group of electric capacity to be accomplished by comparing I during excisionB-IAWith IA-
ICSize once, then according to result judgement excision priority.
2nd, cos ψ are detectedB：
If cos is ψB=1 or for negative value when, process the connect electric capacity of B1 and B2 by point mending, after cutting off the connect electric capacity of B1 and B2,
Cos ψ are judged againBBe whether 1 or for negative value (if in reactive-load compensation, not carrying out phase splitting compensation, then, avoid the need for
This step), if cos is ψB=1 or for negative value when, be handled as follows：Relatively IB-IAWith IC-IBSize：
Such as IB-IA﹥ IC-IB(considering positive and negative), then first cut off CA3, C is cut off afterwardsB3；Such as IB-IA＜ IC-IB(considering positive and negative), then
C is cut off firstB3, C is cut off afterwardsA3, till only mending.Often cut off one group of electric capacity to be accomplished by comparing I during excisionB-IAWith IC-
IBSize once, then according to result judgement excision priority.
3rd, cos ψ are detectedC：
If cos is ψC=1 or for negative value when, process the connect electric capacity of C1 and C2 by point mending, after cutting off the connect electric capacity of C1 and C2,
Cos ψ are judged againCBe whether 1 or for negative value (if in reactive-load compensation, not carrying out phase splitting compensation, then, avoid the need for
This step), if cos is ψC=1 or for negative value when, be handled as follows：Relatively IA-ICWith IC-IBSize：
Such as IA-IC﹥ IC-IB(considering positive and negative), then first cut off CA3, C is cut off afterwardsB3；Such as IA-IC＜ IC-IB(considering positive and negative), then
C is cut off firstB3, C is cut off afterwardsA3, till only mending.Often cut off one group of electric capacity to be accomplished by comparing I during excisionA-ICWith IC-
IBSize once, then according to result judgement excision priority.
In above-described embodiment, reactive-load compensation, three-phase imbalance and low-voltage controlling device include phase splitting compensation unit, not
It is balanced compensated when can not complete idle compensation, then phase splitting compensation is carried out, the phase splitting compensation belongs to prior art.As others
Embodiment, when imbalance compensation can complete idle compensation, the reactive power compensator can no phase splitting compensation unit.
In above-described embodiment, controlling switch is IGCT, the break-make of controller control IGCT to realize the switching of electric capacity,
Used as other embodiments, controlling switch can also be other on-off switches, such as：Relay, the contact of relay with
Capacitances in series, the coil of controller control connection relay, the coil of relay obtain electric or dead electricity correspondingly control relay
Contact conducting or turn off.
In above-mentioned imbalance compensation capacitor switching method embodiment 1 and embodiment 2, appoint the compensated line difference between two-phase
For one and two, it is, of course, also possible to be more a plurality of, either how many compensated lines, the operation/cutting method of its corresponding electric capacity
It is identical.
Three-phase imbalance and low-voltage governing system embodiment 1
Three-phase imbalance and low-voltage governing system in the present embodiment is in imbalance compensation capacitor switching method embodiment 1
In be described later in detail, will not be described here.
Three-phase imbalance and low-voltage governing system embodiment 2
Three-phase imbalance and low-voltage governing system embodiment in the present embodiment is in imbalance compensation capacitor switching method
It has been described later in detail in embodiment 2, has will not be described here.
Three-phase imbalance and low-voltage controlling device embodiment 1
The embodiment of the device is identical with three-phase imbalance and low-voltage governing system embodiment 1, does not repeat here.
Three-phase imbalance and low-voltage controlling device embodiment 2
The embodiment of the device is identical with three-phase imbalance and low-voltage governing system embodiment 2, does not repeat here.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.Without departing from this
Change, modification, replacement and the modification carried out to embodiment in the case of the principle and spirit of invention still falls within the guarantor of the present invention
In the range of shield.
Claims (7)
1. the imbalance compensation electric capacity of a kind of reactive-load compensation, three-phase imbalance and low-voltage governing system puts into method, idle benefit
Repay, three-phase imbalance and low-voltage governing system include for gather the collecting unit of three-phase current and voltage, control unit and
Imbalance compensation unit, the imbalance compensation unit include appointing at least one compensated line being all connected between two-phase, compensation
On circuit, string is provided with imbalance compensation electric capacity and controlling switch；The described control unit control connection controlling switch；Its feature
It is to appoint the compensated line connected between two-phase to include the first compensated line, the imbalance compensation concatenated on the first compensated line
Electric capacity is the first imbalance compensation electric capacity, the step of the input method is：
1) control unit receives the three-phase current and voltage of collecting unit collection by signal input part：
2) according to the electric current and voltage that collect, control unit judges whether following three condition is set up：
1., the difference of the watt current of the watt current and leading phase of delayed phase is more than the first setting value,
2., it is delayed mutually put into the first imbalance compensation electric capacity after, the power factor of the delayed phase is less than 1,
3., after, leading phase puts into the first imbalance compensation electric capacity, the power factor of the leading phase is less than 1,
If 3) above three condition is set up, control input the first imbalance compensation electric capacity.
2. imbalance compensation electric capacity according to claim 1 puts into method, it is characterised in that connect between described two-phase
Compensated line also include the second compensated line, the imbalance compensation electric capacity concatenated on second compensated line is second uneven
Weighing apparatus compensating electric capacity；After the first imbalance compensation electric capacity is put into, judge whether following three condition is set up：
1., the difference of the watt current of the watt current and leading phase of delayed phase is more than the second setting value,
2., it is delayed mutually put into the second imbalance compensation electric capacity after, the power factor of the delayed phase is less than 1,
3., after, leading phase puts into the second imbalance compensation electric capacity, the power factor of the leading phase is less than 1；
If above three condition is set up, control input the second imbalance compensation electric capacity.
3. imbalance compensation electric capacity according to claim 1 puts into method, it is characterised in that first setting value is
The rated capacity of 1.5 times of the first imbalance compensation electric capacity.
4. imbalance compensation electric capacity according to claim 2 puts into method, it is characterised in that second setting value is
The rated capacity of 1.5 times of the first imbalance compensation electric capacity.
5. the imbalance compensation electric capacity cutting method of a kind of reactive-load compensation, three-phase imbalance and low-voltage governing system, idle benefit
Repay, three-phase imbalance and low-voltage governing system include for gather the collecting unit of three-phase current and voltage, control unit and
Imbalance compensation unit, the imbalance compensation unit include appointing at least one compensated line being all connected between two-phase, compensation
On circuit, string is provided with imbalance compensation electric capacity and controlling switch；The described control unit control connection controlling switch；Its feature
It is to appoint the compensated line connected between two-phase to include the first compensated line, the imbalance compensation concatenated on the first compensated line
Electric capacity is the first imbalance compensation electric capacity；The imbalance compensation electric capacity cutting method includes following two steps：
Step one：When the watt current of leading phase is more than the first setting value with the difference of the watt current of delayed phase, institute is cut off
State the first imbalance compensation electric capacity；
Step 2：The step is divided into following three kinds of situations：
If cos is ψA=1 or for negative value when：Relatively IB-IAWith IA-ICSize：Such as IB-IA﹥ IA-IC, then first cut off CA3, after cut
Except CC3；Such as IB-IA＜ IA-IC, then first cut off CC3, C is cut off afterwardsA3；
If cos is ψB=1 or for negative value when：Relatively IB-IAWith IC-IBSize：Such as IB-IA﹥ IC-IB, then first cut off CA3, after cut
Except CB3；Such as IB-IA＜ IC-IB, then first cut off CB3, C is cut off afterwardsA3；
If cos is ψC=1 or for negative value when：Relatively IA-ICWith IC-IBSize：Such as IA-IC﹥ IC-IB, then first cut off CA3, after cut
Except CB3；Such as IA-IC＜ IC-IB, then first cut off CB3, C is cut off afterwardsA3；
Wherein, cos ψAIt is the power factor of A phases, cos ψBIt is the power factor of B phases, cos ψCIt is the power factor of C phases, IAIt is A phases
Watt current, IBIt is the watt current of B phases, ICIt is the watt current of C phases, CA3It is on the compensated line between A phases and B phases
First imbalance compensation electric capacity, CB3It is the first imbalance compensation electric capacity on the compensated line between B phases and C phases, CC3It is C phases
With the first imbalance compensation electric capacity on the compensated line between A phases.
6. imbalance compensation electric capacity cutting method according to claim 5, it is characterised in that connect between described two-phase
Compensated line also include the second compensated line, the imbalance compensation electric capacity concatenated on second compensated line is second uneven
Weighing apparatus compensating electric capacity；
In the step one：After the first imbalance compensation electric capacity is cut off, the watt current and delayed phase of leading phase are judged
Watt current difference whether during more than the second setting value, if greater than, then excision the second imbalance compensation electric capacity；
In the step 2：
If the cos ψA=1 or for negative value when：Relatively IB-IAWith IA-ICSize：Such as IB-IA﹥ IA-IC, then first cut off CA3、
CA4, C is cut off afterwardsC3、CC4；Such as IB-IA＜ IA-IC, then first cut off CC3、CC4, C is cut off afterwardsA3、CA4；
If the cos ψB=1 or for negative value when：Relatively IB-IAWith IC-IBSize：Such as IB-IA﹥ IC-IB, then first cut off CA3、
CA4, C is cut off afterwardsB3、CB4；Such as IB-IA＜ IC-IB, then first cut off CB3、CB4, C is cut off afterwardsA3、CA4；
If the cos ψC=1 or for negative value when：Relatively IA-ICWith IC-IBSize：Such as IA-IC﹥ IC-IB, then first cut off CA3、
CA4, C is cut off afterwardsB3、CB4；Such as IA-IC＜ IC-IB, then first cut off CB3、CB4, C is cut off afterwardsA3、CA4；
Wherein, CA4It is the second imbalance compensation electric capacity on the compensated line between A phases and B phases, CB4It is between B phases and C phases
The second imbalance compensation electric capacity on compensated line, CC4It is the second imbalance compensation electricity on the compensated line between C phases and A phases
Hold.
7. a kind of reactive-load compensation, three-phase imbalance and low-voltage controlling device, it is characterised in that include for gathering three-phase current
Collecting unit, control unit and imbalance compensation unit with voltage, the imbalance compensation unit include appointing between two-phase
At least one compensated line of connection, appoints the compensated line connected between two-phase to include the first compensated line, the first compensated line
The imbalance compensation electric capacity of upper concatenation is the first imbalance compensation electric capacity, described control unit operation imbalance compensation electric capacity input
Method and/or imbalance compensation electric capacity cutting method；The step of imbalance compensation electric capacity input method is：
1) control unit receives the three-phase current and voltage of collecting unit collection by signal input part：
2) according to the electric current and voltage that collect, control unit judges whether following three condition is set up：
1., the difference of the watt current of the watt current and leading phase of delayed phase is more than the first setting value,
2., it is delayed mutually put into the first imbalance compensation electric capacity after, the power factor of the delayed phase is less than 1,
3., after, leading phase puts into the first imbalance compensation electric capacity, the power factor of the leading phase is less than 1,
If 3) above three condition is set up, control input the first imbalance compensation electric capacity；
The step of imbalance compensation electric capacity cutting method is：
Step one：When the watt current of leading phase is more than the first setting value with the difference of the watt current of delayed phase, institute is cut off
State the first imbalance compensation electric capacity；
Step 2：The step is divided into following three kinds of situations：
If cos is ψA=1 or for negative value when：Relatively IB-IAWith IA-ICSize：Such as IB-IA﹥ IA-IC, then first cut off CA3, after cut
Except CC3；Such as IB-IA＜ IA-IC, then first cut off CC3, C is cut off afterwardsA3；
If cos is ψB=1 or for negative value when：Relatively IB-IAWith IC-IBSize：Such as IB-IA﹥ IC-IB, then first cut off CA3, after cut
Except CB3；Such as IB-IA＜ IC-IB, then first cut off CB3, C is cut off afterwardsA3；
If cos is ψC=1 or for negative value when：Relatively IA-ICWith IC-IBSize：Such as IA-IC﹥ IC-IB, then first cut off CA3, after cut
Except CB3；Such as IA-IC＜ IC-IB, then first cut off CB3, C is cut off afterwardsA3；
Wherein, cos ψAIt is the power factor of A phases, cos ψBIt is the power factor of B phases, cos ψCIt is the power factor of C phases, IAIt is A phases
Watt current, IBIt is the watt current of B phases, ICIt is the watt current of C phases, CA3It is on the compensated line between A phases and B phases
First imbalance compensation electric capacity, CB3It is the first imbalance compensation electric capacity on the compensated line between B phases and C phases, CC3It is C phases
With the first imbalance compensation electric capacity on the compensated line between A phases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN201584790U (en) * | 2009-12-28 | 2010-09-15 | 苏州工业园区和顺电气股份有限公司 | Low-voltage dynamic reactive power compensation device |
| US8410638B2 (en) * | 2010-05-13 | 2013-04-02 | Eaton Corporation | Uninterruptible power supply systems and methods supporting load balancing |
| CN201994670U (en) * | 2010-10-26 | 2011-09-28 | 中国电力科学研究院 | Low-voltage dynamic generalized reactive power compensation device |
| CN202094634U (en) * | 2010-10-26 | 2011-12-28 | 中国电力科学研究院 | Dynamic reactive power compensation device |
| CN202260480U (en) * | 2011-10-09 | 2012-05-30 | 泉州维盾电气有限公司 | Tail end voltage booster device arranged on three-phase four-wire transmission line |
| CN204928179U (en) * | 2015-06-09 | 2015-12-30 | 河南博通电力技术有限公司 | Reactive compensation , unbalanced three phase and low -voltage treatment system |
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