CN108092289A - A kind of three-phase imbalance compensation device and system - Google Patents
A kind of three-phase imbalance compensation device and system Download PDFInfo
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- CN108092289A CN108092289A CN201810150280.2A CN201810150280A CN108092289A CN 108092289 A CN108092289 A CN 108092289A CN 201810150280 A CN201810150280 A CN 201810150280A CN 108092289 A CN108092289 A CN 108092289A
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Classifications
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
-
- 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
- Y02E40/10—Flexible AC transmission systems [FACTS]
-
- 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 provides a kind of three-phase imbalance compensation device and system, wherein, the three-phase imbalance compensation device, including：Static reactive generator SVG units and static reactive unit；SVG units and static reactive unit access electricity grid network, and SVG units and the electrical connection of static reactive unit；SVG units for gathering three road phase current signals of electricity grid network output in real time, export and three road phase current signals are carried out with the switching signal after idle analysis to static reactive unit；Static reactive unit for receiving the switching signal of SVG units transmission, and carries out switching according to switching signal, reactive-load compensation is carried out at the same time with the three road phase currents to electricity grid network.By three-phase imbalance compensation device provided by the invention and system, the reactive-load compensation of SVG units and the realization of static reactive unit to electricity grid network can be combined, practicability is more preferably.
Description
Technical field
The present invention relates to three-phase imbalance Treatment process field, in particular to a kind of three-phase imbalance compensation device
And system.
Background technology
Three-phase current or voltage magnitude is inconsistent in electric system, and difference in magnitude is more than prescribed limit, is known as three-phase
It is uneven.Low-voltage network refers to the voltage network by the decompression power supply of distribution voltage device, due to power distribution network be three-phase with it is single-phase
User is mixed with power grid, therefore voltage distribution net is passed through and powered frequently with three-phase four-wire circuit.When the single-phase load in three-phase not
When equal, distribution transformer output will generate three-phase imbalance phenomenon.
Important component of the rural power grids as State Grid's supply service system, is relation rural economy social development
Important infrastructure, due to rural power grids supply line head, not only there are three-phase productive power in supply network, but also there are single-phase lives
Electricity consumption, meanwhile, with the development of Power Electronic Technique, various frequency converter and single-phase switch supply unit are widely used
In rural power grids, three-phase imbalance problem is more on the rise in rural power grids, this directly results in the deterioration of rural power grids power quality, sternly
Ghost image rings the living standard of resident.
As it can be seen that there is an urgent need for a kind of three-phase imbalance compensation schemes to solve the problems, such as rural power grids three-phase imbalance.
The content of the invention
In view of this, it is an object of the invention to provide a kind of three-phase imbalance compensation device and system, with reference to SVG units
The reactive-load compensation to electricity grid network is realized with static reactive unit, and practicability is more preferably.
In a first aspect, the present invention provides a kind of three-phase imbalance compensation device, including：Static reactive generator SVG is mono-
Member and static reactive unit；The SVG units and the static reactive unit access electricity grid network, and described
SVG units and static reactive unit electrical connection；
The SVG units for gathering three road phase current signals of the electricity grid network output in real time, are exported to described three
Road phase current signal carries out the switching signal after idle analysis to the static reactive unit；
The static reactive unit, for receiving the switching signal that the SVG units are sent, and according to the switching
Signal carries out switching, and reactive-load compensation is carried out at the same time with the three road phase currents to the electricity grid network.
With reference to first aspect, the present invention provides the first possible embodiment of first aspect, wherein, it is described static
Reactive compensation unit includes：Capacitor and combination switch, the capacitor and combination switch series connection；
The combination switch for receiving the switching signal that the SVG units are sent, and is carried out according to the switching signal
Switching is carried out at the same time idle benefit with the capacitor that the combination switch is connected with control to three road phase currents of the electricity grid network
It repays.
With reference to first aspect, the present invention provides second of possible embodiment of first aspect, wherein, the SVG
Unit includes：Phase current Acquisition Circuit, control circuit and output circuit, wherein,
The phase current Acquisition Circuit, for gathering three road phase current signals of the electricity grid network output, output in real time
To the control circuit；
The control circuit, for receiving three road phase current signal, export according to three road phase current signal into
The switching signal generated after analysis that row is idle；
The output circuit, for exporting the switching signal to the static reactive unit.
Second of possible embodiment with reference to first aspect, the third the present invention provides first aspect are possible
Embodiment, wherein, the static reactive unit is multiple；
Control circuit for receiving three road phase current signal, carries out idle analysis respectively, obtains three tunnel mutually electricity
The corresponding minimum reactive power of signal is flowed, is matched, obtained and the idle work(of minimum with multiple static reactive units
One or more static reactive units that rate matches, to the one or more static reactive units to match
Export switching signal, the reactive compensation power and value of the one or more static reactive units to match with it is described
The difference of minimum reactive power is minimum.
With reference to first aspect, the possible embodiment of the first of first aspect is to the third possible embodiment, this
Invention provides the 4th kind of possible embodiment of first aspect, wherein, described device further includes：Multiple single channel static reacances
Compensating unit,
Control circuit is additionally operable to calculating and carries out the corresponding reactive power of phase current signal after reactive-load compensation, if described idle
Power, which is more than, presets idle threshold value, from the multiple single channel static reactive unit, chooses and the reactive power phase
The single channel static reactive unit matched somebody with somebody exports switching signal to the single channel static reactive unit to match, so that
The single channel static reactive unit to match carries out reactive-load compensation to the corresponding phase current of the reactive power.
The 4th kind of possible embodiment with reference to first aspect, the 5th kind the present invention provides first aspect are possible
Embodiment, wherein, the control circuit presets idle threshold value, according to the nothing if being additionally operable to the reactive power and being not more than
Work(power carries out reactive-load compensation to the corresponding phase current of the reactive power.
The possible embodiment of with reference to first aspect the first, the 6th kind the present invention provides first aspect are possible
Embodiment, wherein, the capacitor is alternate compensation capacitor；The alternate compensation capacitor is three；
Three are overlapped on respectively for three road one-way capacitor devices, the three roads one-way capacitor device inside every alternate compensation capacitor
Between the corresponding three two-phase electric wires of phase electric wire, and every alternate compensation capacitor is connected No. three combination switches, and
When the arbitrary branch of the combination switch is closed, the alternate compensation capacitor is accessed in corresponding two-phase electric wire.
The possible embodiment of with reference to first aspect the first, the 7th kind the present invention provides first aspect are possible
Embodiment, wherein, the capacitor is a point benefit compensation capacitor；
Mending compensation capacitor for described point includes three single-phase capacitances, and shape connection arranged side by side is used between three single-phase capacitances, and
When mending the corresponding combination switch of compensation capacitor with this point and being closed, the shape connection arranged side by side it is each pick out a little with three-phase wire
It is each to be connected.
With reference to first aspect, the present invention provides the 8th kind of possible embodiment of first aspect, wherein, further include IO
Plate；
The SVG units are connected by the I O board with the static reactive unit.
Second aspect, the present invention also provides a kind of three-phase imbalance compensation system, including first aspect, first aspect
Three-phase of the first possible embodiment into the 8th kind of possible embodiment described in any possible embodiment is not
Compensating chain device further includes：Electricity grid network；
The electricity grid network, for exporting three road phase current signals；
The three-phase imbalance compensation device, for gathering three road phase current signals of the electricity grid network output in real time,
According to three road phase current signals are carried out the switching signal after idle analyses to three road phase currents of the electricity grid network simultaneously into
Row reactive-load compensation.
Three-phase imbalance compensation device provided by the invention, including：Static reactive generator SVG units and static var compensation
Repay unit；SVG units and static reactive unit access electricity grid network, and SVG units and static reactive unit electricity
Connection；SVG units, for gather in real time electricity grid network output three road phase current signals, export to three road phase current signals into
Switching signal after the idle analysis of row is to static reactive unit；Static reactive unit sends for receiving SVG units
Switching signal, and according to switching signal carry out switching, be carried out at the same time reactive-load compensation with the three road phase currents to electricity grid network.It is logical
Three-phase imbalance compensation device and system provided by the invention are crossed, SVG units can be combined and static reactive unit is realized
Reactive-load compensation to electricity grid network, practicability is more preferably.
For the above objects, features and advantages of the present invention is enable to be clearer and more comprehensible, preferred embodiment cited below particularly, and coordinate
Appended attached drawing, is described in detail below.
Description of the drawings
It in order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of scope, for those of ordinary skill in the art, without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 shows a kind of structure diagram for three-phase imbalance compensation device that the embodiment of the present invention is provided；
Fig. 2 shows that the structure of SVG units in a kind of three-phase imbalance compensation device that the embodiment of the present invention is provided is shown
It is intended to；
Fig. 3 shows a kind of application structure schematic diagram for three-phase imbalance compensation device that the embodiment of the present invention is provided；
Fig. 4-Fig. 9 is between each function element in a kind of three-phase imbalance compensation device provided in an embodiment of the present invention
Wiring diagram；
Figure 10-Figure 14 is the experimental result picture put into before and after three-phase imbalance compensation device provided in an embodiment of the present invention.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
The technical solution in the embodiment of the present invention is clearly and completely described in middle attached drawing, it is clear that described embodiment is only
It is part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is real
Applying the component of example can configure to arrange and design with a variety of.Therefore, below to provide in the accompanying drawings the present invention
The detailed description of embodiment is not intended to limit the scope of claimed invention, but is merely representative of the selected reality of the present invention
Apply example.Based on the embodiment of the present invention, institute that those skilled in the art are obtained on the premise of creative work is not made
There is other embodiment, belong to the scope of protection of the invention.
In view of correlation technique, there is an urgent need for a kind of three-phase imbalance compensation schemes to solve the problems, such as rural power grids three-phase imbalance.Have
In consideration of it, an embodiment of the present invention provides a kind of three-phase imbalance compensation device and system, with reference to SVG units and static var compensation
Reactive-load compensation of the unit realization to electricity grid network is repaid, practicability is more preferably.
The concrete structure of three-phase imbalance compensation device provided in an embodiment of the present invention is as follows：
Referring to Fig. 1, an embodiment of the present invention provides a kind of three-phase imbalance compensation device, which specifically includes：It is static
Reacance generator SVG units 11 and static reactive unit 22；SVG units 11 and static reactive unit 22 access electricity
Net network 33, and SVG units 11 and static reactive unit 22 are electrically connected；
SVG units 11 for gathering three road phase current signals of the output of electricity grid network 33 in real time, are exported to three road phase currents
Signal carries out the switching signal after idle analysis to static reactive unit 22；
Static reactive unit 22 for receiving the switching signal of the transmission of SVG units 11, and is carried out according to switching signal
Switching is carried out at the same time reactive-load compensation with the three road phase currents to electricity grid network 33.
Three-phase imbalance compensation device provided in an embodiment of the present invention, including：Static reactive generator SVG units 11 and quiet
Only reactive compensation unit 22；SVG units 11 and static reactive unit 22 access electricity grid network 33, and 11 He of SVG units
Static reactive unit 22 is electrically connected；SVG units 11, for gathering three road phase current letters of the output of electricity grid network 33 in real time
Number, it exports and three road phase current signals is carried out with the switching signal after idle analysis to static reactive unit 22；Static reacance
Compensating unit 22 for receiving the switching signal of the transmission of SVG units 11, and carries out switching, with to power grid net according to switching signal
Three road phase currents of network 33 are carried out at the same time reactive-load compensation.By three-phase imbalance compensation device provided by the invention, can combine
SVG units 11 and static reactive unit 22 realize the reactive-load compensation to electricity grid network 33, and practicability is more preferably.
Specifically, combination SVG of embodiment of the present invention units 11 and static reactive unit 22, using control built in SVG
Device to static reactive unit 22 coordinate control to control the automatic switching of capacitor in static reactive unit 22,
Reactive-load compensation is carried out so as to fulfill the three road phase currents to electricity grid network 33.
Wherein, above-mentioned static reactive unit 22 includes：Capacitor and combination switch, capacitor and combination switch string
Connection；
Combination switch for receiving the switching signal of the transmission of SVG units 11, and carries out switching, with control according to switching signal
System is carried out at the same time reactive-load compensation with the capacitor that the combination switch is connected to three road phase currents of electricity grid network 33.
For the ease of carrying out reactive-load compensations to three road phase currents by capacitor, referring to Fig. 2, in the embodiment of the present invention
SVG units 11 include：Phase current Acquisition Circuit 111, control circuit 112 and output circuit 113, wherein,
Phase current Acquisition Circuit 111, for gathering three road phase current signals of the output of electricity grid network 33, output to control in real time
Circuit 112 processed；
Control circuit 112, for receiving three road phase current signals, output carries out idle analysis according to three road phase current signals
The switching signal generated afterwards；
Output circuit 113, for exporting switching signal to static reactive unit 22.
Specifically, the embodiment of the present invention is realized by the phase current Acquisition Circuit 111 in SVG units 11 to three road phase currents
The acquisition of signal carries out idle analysis, to believe according to the switching of generation by control circuit 112 to above-mentioned three road phase current signal
The switching of combination switch in number above-mentioned static reactive unit 22 of control.
SVG units 11 in three-phase imbalance compensation device provided in an embodiment of the present invention can not only control static reacance
Compensating unit 22 carries out reactive-load compensation to three road phase currents, can also use 11 built-in controller of SVG units control SVG units
Compensate electric current output.In the idle output of adjustment equipment, by the way of the fine tuning of capacitor coarse adjustment combination SVG units 11, not only
Alternate transfer that is idle, and can realizing active is can compensate for, it is in real time 1 to realize system three-phase activity coefficient, meanwhile, as one
Kind active type compensation product, the device also have the function of balanced three-phase current, harmonic filtration and voltage support.Next into one
Coarse adjustment provided in an embodiment of the present invention and fine tuning is described in detail in step.
In the embodiment of the present invention, static reactive unit 22 is multiple；Control circuit 112, for receiving three tunnels mutually electricity
Signal is flowed, carries out idle analysis respectively, the corresponding minimum reactive power of three road phase current signals is obtained, with multiple static var compensations
It repays unit 22 to be matched, obtains the one or more static reactive units 22, Xiang Xiang to match with minimum reactive power
Matched one or more static reactive unit 22 exports switching signal, the one or more static reactives to match
The difference of the reactive compensation power and value and minimum reactive power of unit 22 is minimum.That is, pass through multiple static reactives
The combination of unit 22 can cause the closest minimum reactive power of reactive power and value after compensation, if after above-mentioned compensation
Reactive power be more than preset idle threshold value, then need using single channel static reactive unit 22 carry out monophase current it is idle
Compensation if the reactive power after above-mentioned compensation, which is not more than, is preset idle threshold value, is needed using SVG units 11 according to reactive power
Reactive-load compensation is carried out to the corresponding phase current of reactive power.
Wherein, for using for single channel static reactive unit 22, above-mentioned control circuit 112 is idle for carrying out
The corresponding reactive power of phase current signal after compensation, if reactive power, which is more than, presets idle threshold value, from multiple single channel static reacances
In compensating unit 22, the single channel static reactive unit 22 to match with reactive power is chosen, it is static to the single channel to match
Reactive compensation unit 22 exports switching signal, so that the single channel static reactive unit 22 to match is corresponding to reactive power
Phase current carries out reactive-load compensation.
Capacitor in the embodiment of the present invention can be that alternate compensation capacitor has three the alternate of road phase current to realize
Work(shifts and compensation, and the number of the alternate compensation capacitor can be multiple, and can be according to different 33 demands of electricity grid network
The alternate compensation capacitor of different capabilities is selected, similar, the capacitor in the embodiment of the present invention can also be a point benefit compensation electricity
Container to realize the reactive-load compensation to any phase in three road phase currents, number that this point mends compensation capacitor can be it is multiple,
And point benefit compensation capacitor of different capabilities can be selected according to different 33 demands of electricity grid network.
Wherein, alternate compensation capacitor is three；It is three road one-way capacitor devices, three tunnels inside every alternate compensation capacitor
One-way capacitor device is overlapped on respectively between the corresponding three two-phase electric wires of three-phase wire, and every alternate compensation capacitor is connected
One No. three combination switch, and when the arbitrary branch of combination switch is closed, alternate compensation capacitor is accessed into corresponding two-phase
In electric wire；Mending compensation capacitor for above-mentioned point includes three single-phase capacitances, using shape connection arranged side by side between three single-phase capacitances, and
When mending the corresponding combination switch of compensation capacitor with this point and being closed, the shape connection arranged side by side it is each pick out it is a little each with three-phase wire
It is connected.
Three-phase imbalance compensation device provided in an embodiment of the present invention further includes I O board, SVG units 11 then by I O board with
Static reactive unit 22 connects.
Three-phase imbalance compensation device provided in an embodiment of the present invention, including：Static reactive generator SVG units 11 and quiet
Only reactive compensation unit 22；SVG units 11 and static reactive unit 22 access electricity grid network 33, and 11 He of SVG units
Static reactive unit 22 is electrically connected；SVG units 11, for gathering three road phase current letters of the output of electricity grid network 33 in real time
Number, it exports and three road phase current signals is carried out with the switching signal after idle analysis to static reactive unit 22；Static reacance
Compensating unit 22 for receiving the switching signal of the transmission of SVG units 11, and carries out switching, with to power grid net according to switching signal
Three road phase currents of network 33 are carried out at the same time reactive-load compensation.By three-phase imbalance compensation device provided by the invention, can combine
SVG units 11 and static reactive unit 22 realize the reactive-load compensation to electricity grid network 33, and practicability is more preferably.
Three-phase imbalance compensation device based on the embodiment of the present invention, the embodiment of the present invention additionally provide a kind of three-phase
Imbalance compensation system, the system further include electricity grid network 33；
Electricity grid network 33, for exporting three road phase current signals；
Three-phase imbalance compensation device, for gathering three road phase current signals of the output of electricity grid network 33 in real time, according to right
The switching signal that three road phase current signals are carried out after idle analysis is carried out at the same time idle benefit to three road phase currents of electricity grid network 33
It repays.
Three-phase imbalance compensation system provided in an embodiment of the present invention can combine SVG units 11 and static reactive
Unit 22 realizes the reactive-load compensation to electricity grid network 33, and practicability is more preferably.
For the ease of further understanding for the three-phase imbalance compensation device that provides inventive embodiments and system, next
It is illustrated with reference to a specific example.
With reference to Fig. 3, first to the function element involved in three-phase imbalance compensation device provided in an embodiment of the present invention into
Row simple declaration.
QF：Breaker；
I-TAa：Device A phase current sampling mutual inductors；
I-TBb：Device B phase current samplings mutual inductor (not marked in Fig. 3)；
I-TCc：Device C phase current samplings mutual inductor (not marked in Fig. 3)；
SPD：Surge Protector；
U1：Static reactive generator SVG units；
SVC units 1~4：Static reactive unit；
Wherein, SVC units 1 include：Alternate compensation combination switch K1, alternate flying capcitor device 1C1；
SVC units 2 include：Alternate compensation combination switch K2, alternate flying capcitor device 2C1；
SVC units 3 include：Alternate compensation combination switch K3, alternate flying capcitor device 3C1；
SVC units 4 include：Phase splitting compensation combination switch K4, benefit capacitor 4C1 is divided；
IOBord：I O board；
VD1：Direct current 12V power supplys；
ACFAN1~2：Cooling fan；
FU1：Control insurance；
WK：Temperature switch.
Specific wiring is as shown in Fig. 4~Fig. 9.
Wherein, Fig. 4 is current sample wiring diagram；Fig. 5 powers for SVG units with I O board and communications line figure；Fig. 6 is IO
Plate controls wiring diagram with combination switch；Fig. 7 is direct current 12V power supply wiring figures；Fig. 8 is air-blower control wiring diagram；Fig. 9 is mono- for SVG
Member is to external terminal schematic diagram.
The configuration of above-mentioned each function element is as shown in the table：
Figure 10 is put into for three-phase imbalance compensation device provided in an embodiment of the present invention to foreground partition (namely electricity grid network)
Three-phase electricity flow graph, as can be seen from the figure compensate first three phase current and exist uneven, A phase currents are 357A, and B phase currents are
320A, C phase current are 436A；Figure 11 is the three-phase electricity flow graph after above device input, as can be seen from the figure three after compensation
Phase current reaches balance, and A phase currents are 375A, and B phase currents are 374A, and C phase currents are 375A, three-phase balance；Figure 12 is
N phase current curvilinear trend figures before and after above device input, it can be seen that N phase currents reach 96A, neutral line current before input from data
It is apparent excessive；After device input, N line currents are substantially reduced, and N line currents are only 3A, and adjusting three is played after illustrating device input
Mutually unbalanced effect；Figure 13 is power factor curve tendency chart before device input, before can be seen that device puts into operation from data
Three phases active power is uneven, and power factor fluctuation is larger, and power factor is less than 0.95；Figure 14 is power factor after device input
Curvilinear trend figure, from data it can be seen that device put into operation after three phases active power balance, power factor fluctuation it is smaller, power because
Number is maintained at 0.98.
In addition, three-phase imbalance compensation device provided in an embodiment of the present invention and system can also bring following technology to imitate
Fruit：
1.SVG units directly control capacitor, are really achieved the effect of linear compensation；
2. control strategy is diversified, configurable to mend capacitor altogether, divide benefit capacitor and alternate flying capcitor device etc.；
3. it under uneven pattern, is realized using first alternate bridging compensation capacitor coarse adjustment, the mode of rear SVG cell trimmings
The output of complete machine minimum power consumption；
4. using the control strategy of switching cycle capacitor, extend the service life of capacitor；
5. compared with pure SVG compensation models, under equivalent capability：The binding pattern of SVG and capacitor is cost-effective；
6. multiple target parameter coordination controls, using parameters such as voltage, power factor, reactive-load compensations as integrated judgment foundation, nothing
Switching concussion, uncompensated dull section；
It 7. the plant bulk is small, may be mounted in the JP cabinets compensated chamber of standard, save the cost of investment of client.
In embodiment provided by the present invention, it should be understood that disclosed device and system, it can be by others side
Formula is realized.The apparatus embodiments described above are merely exemplary, for example, the division of the unit, is only that one kind is patrolled
The division of volume function, can there is other dividing mode in actual implementation, in another example, multiple units or component can combine or can
To be integrated into another system or some features can be ignored or does not perform.Another, shown or discussed is mutual
Coupling, direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some communication interfaces, device or unit
It connects, can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separate, be shown as unit
The component shown may or may not be physical location, you can be located at a place or can also be distributed to multiple
In network element.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
In addition, each functional unit in embodiment provided by the invention can be integrated in a processing unit, also may be used
To be that unit is individually physically present, can also two or more units integrate in a unit.
If the function is realized in the form of SFU software functional unit and is independent production marketing or in use, can be with
It is stored in a computer read/write memory medium.Based on such understanding, technical scheme is substantially in other words
The part contribute to the prior art or the part of the technical solution can be embodied in the form of software product, the meter
Calculation machine software product is stored in a storage medium, is used including some instructions so that a computer equipment (can be
People's computer, server or network equipment etc.) perform all or part of the steps of the method according to each embodiment of the present invention.
And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic disc or CD.
It should be noted that：Similar label and letter represents similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined, then it further need not be defined and explained in subsequent attached drawing in a attached drawing, in addition, term " the
One ", " second ", " the 3rd " etc. are only used for distinguishing description, and it is not intended that instruction or hint relative importance.
Finally it should be noted that：Embodiment described above is only the specific embodiment of the present invention, to illustrate the present invention
Technical solution, rather than its limitations, protection scope of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, it will be understood by those of ordinary skill in the art that：Any one skilled in the art
In the technical scope disclosed by the present invention, can still modify to the technical solution recorded in previous embodiment or can be light
It is readily conceivable that variation or equivalent substitution is carried out to which part technical characteristic；And these modifications, variation or replacement, do not make
The essence of appropriate technical solution departs from the spirit and scope of technical solution of the embodiment of the present invention.The protection in the present invention should all be covered
Within the scope of.Therefore, protection scope of the present invention described should be subject to the protection scope in claims.
Claims (10)
1. a kind of three-phase imbalance compensation device, which is characterized in that including：Static reactive generator SVG units and static reacance
Compensating unit；The SVG units and the static reactive unit access electricity grid network, and SVG units and described
Static reactive unit is electrically connected；
The SVG units for gathering three road phase current signals of the electricity grid network output in real time, are exported to three tunnel phase
Current signal carries out the switching signal after idle analysis to the static reactive unit；
The static reactive unit, for receiving the switching signal that the SVG units are sent, and according to the switching signal
Switching is carried out, reactive-load compensation is carried out at the same time with the three road phase currents to the electricity grid network.
2. three-phase imbalance compensation device according to claim 1, which is characterized in that the static reactive unit bag
It includes：Capacitor and combination switch, the capacitor and combination switch series connection；
The combination switch for receiving the switching signal that the SVG units are sent, and is thrown according to the switching signal
It cuts, reactive-load compensation is carried out at the same time to three road phase currents of the electricity grid network with the capacitor that the combination switch is connected with control.
3. three-phase imbalance compensation device according to claim 1, which is characterized in that the SVG units include：Phase current
Acquisition Circuit, control circuit and output circuit, wherein,
The phase current Acquisition Circuit for gathering three road phase current signals of the electricity grid network output in real time, is exported to institute
State control circuit；
The control circuit for receiving three road phase current signal, exports and carries out nothing according to three road phase current signal
The switching signal generated after work(analysis；
The output circuit, for exporting the switching signal to the static reactive unit.
4. three-phase imbalance compensation device according to claim 3, which is characterized in that the static reactive unit is
It is multiple；
Control circuit for receiving three road phase current signal, carries out idle analysis respectively, obtains three road phase current letter
Number corresponding minimum reactive power, is matched with multiple static reactive units, is obtained and the minimum reactive power phase
Matched one or more static reactive unit, exports to the one or more static reactive units to match
Switching signal, reactive compensation power and value and the minimum of the one or more static reactive units to match
The difference of reactive power is minimum.
5. three-phase imbalance compensation device according to any one of claims 1 to 4, which is characterized in that described device is also wrapped
It includes：Multiple single channel static reactive units,
Control circuit is additionally operable to calculating and carries out the corresponding reactive power of phase current signal after reactive-load compensation, if the reactive power
More than default idle threshold value, from the multiple single channel static reactive unit, choose what is matched with the reactive power
Single channel static reactive unit exports switching signal, so that described to the single channel static reactive unit to match
The single channel static reactive unit to match carries out reactive-load compensation to the corresponding phase current of the reactive power.
6. three-phase imbalance compensation device according to claim 5, which is characterized in that the control circuit, if being additionally operable to
The reactive power, which is not more than, presets idle threshold value, and the corresponding phase current of the reactive power is carried out according to the reactive power
Reactive-load compensation.
7. three-phase imbalance compensation device according to claim 2, which is characterized in that the capacitor is alternate compensation electricity
Container；The alternate compensation capacitor is three；
Three-phase electricity is overlapped on respectively for three road one-way capacitor devices, the three roads one-way capacitor device inside every alternate compensation capacitor
Between the corresponding three two-phase electric wires of line, and every alternate compensation capacitor is connected No. three combination switches, and described
When the arbitrary branch of combination switch is closed, the alternate compensation capacitor is accessed in corresponding two-phase electric wire.
8. three-phase imbalance compensation device according to claim 2, which is characterized in that the capacitor is a point benefit compensation electricity
Container；
Mending compensation capacitor for described point includes three single-phase capacitances, using shape connection arranged side by side between three single-phase capacitances, and with
When the corresponding combination switch of this point benefit compensation capacitor is closed, each of the shape connection arranged side by side picks out a little each phase with three-phase wire
It is connected.
9. three-phase imbalance compensation device according to claim 1, which is characterized in that further include I O board；
The SVG units are connected by the I O board with the static reactive unit.
10. a kind of three-phase imbalance compensation system compensates dress including the three-phase imbalance any one of claim 1 to 9
It puts, which is characterized in that further include：Electricity grid network；
The electricity grid network, for exporting three road phase current signals；
The three-phase imbalance compensation device, for gathering three road phase current signals of the electricity grid network output in real time, according to
The switching signal carried out to three road phase current signals after idle analysis is carried out at the same time nothing to three road phase currents of the electricity grid network
Work(compensates.
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| CN201810150280.2A CN108092289A (en) | 2018-02-13 | 2018-02-13 | A kind of three-phase imbalance compensation device and system |
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| CN201810150280.2A CN108092289A (en) | 2018-02-13 | 2018-02-13 | A kind of three-phase imbalance compensation device and system |
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