CN107221938A - Mixed compensation method and mixed compensation device - Google Patents
Mixed compensation method and mixed compensation device Download PDFInfo
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- CN107221938A CN107221938A CN201710385617.3A CN201710385617A CN107221938A CN 107221938 A CN107221938 A CN 107221938A CN 201710385617 A CN201710385617 A CN 201710385617A CN 107221938 A CN107221938 A CN 107221938A
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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
- H02J3/18—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
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- Y02E40/40—Arrangements for reducing harmonics
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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention proposes a kind of mixed compensation method, while with compensation quality is ensured, reduces the advantage of SVG workload, compensation process is：If being capacitive reactive power compensation needed for system, then SVG is put into advance, if common benefit condenser capacity Qmax(gcap)<Qload(svg), then put into this and mend capacitor altogether, until the total idle Q of SVG loadsload(svg)The common benefit capacitor for not being available for input is reduced to, if next also needing compensation, judges whether to put into point benefit capacitor, until SVG Qaload(svg)、Qbload(svg)、Qcload(svg)Point benefit capacitor for not being available for input is reduced to, in addition, it is also proposed that a kind of mixed compensation device, with can coordinate both SVG and intelligent capacitor, and during failure, normal SVG or intelligent capacitor remain able to the advantage of normal work.
Description
Technical field
It is especially a kind of mixed compensation method and mixed compensation device the present invention relates to reactive power compensation technology field.
Background technology
A variety of compensation schemes are proposed for reactive-load compensation at present, one of which technology path is mixed compensation：Such as 1,
SVG+TSC compensation scheme, such as application publication number are the mixing disclosed in CN105186531A Chinese invention patent application
Disclosed in the devices and methods therefor of type dynamic passive compensation, the Chinese invention patent that Authorization Notice No. is CN203690930U
A kind of mixed type reactive compensation control system, Authorization Notice No. are the intelligence disclosed in CN202084939U Chinese invention patent
Electric integrated compensation device etc.；2nd, the compensation scheme of SVG+ intelligent capacitors, SVG+ intelligent capacitors are isolated operation.
But whether being any, in order to preferably play the effect of mixed compensation, for the strategy of mixed compensation
Research is essential, and the strategy of mixed compensation is mixed compensation method, although existing mixed compensation method has necessarily
Research, but applicants contemplate that ensure compensation quality while, reduce SVG workload in terms of also need to further grind
Study carefully.
The content of the invention
The technical problems to be solved by the invention are to overcome the defect of prior art there is provided a kind of mixed compensation method, tool
While secure compensation quality, the advantage of SVG workload is reduced, in addition, it is also proposed that a kind of mixed compensation device, with energy
Enough coordinate both SVG and intelligent capacitor, and when breaking down, normal SVG or intelligent capacitor remain able to normal work
The advantage of work.
In order to solve the above technical problems, the present invention proposes a kind of mixed compensation method, condenser capacity is each mended altogether and is remembered
For Qmax(gcap), three compatible amounts of each point benefit capacitor are designated as Qamax(fcap)、Qbmax(fcap)、 Qcmax(fcap), compensation process
For：
If being capacitive reactive power compensation needed for system, then SVG is put into advance, remember that SVG load is always idle and be
Qload(svg), then, if common benefit condenser capacity Qmax(gcap)<Qload(svg), then put into this and mend capacitor altogether, now SVG
Load is total idle for E=Qload(svg)The capacity Q of-common benefit capacitor this time put intomax(gcap)If also having and mending capacitor altogether
Capacity Qmax(gcap)<E, then continuation input is corresponding to mend capacitor altogether, until the total idle Q of SVG loadsload(svg)It is reduced to not
There is the common benefit capacitor for being available for input, if next also needing compensation, A, B, C threephase load of now SVG compensation are idle to be remembered respectively
For Qaload(svg)、Qbload(svg)、 Qcload(svg), then judge whether to put into point benefit capacitor, i.e., for A phases, if a point benefit electricity
The Q of containeramax(fcap)<Qaload(svg), then the A phases of this point of benefit capacitor are put into, for B phases, if point benefit capacitor
Qbmax(fcap)<Qbload(svg), then the B phases of this point of benefit capacitor are put into, for C phases, if the Q of point benefit capacitorcmax(fcap)
<Qcload(svg), then the C phases of this point of benefit capacitor are put into, until SVG Qaload(svg)、Qbload(svg)、Qcload(svg)It is reduced to
It is not available for point benefit capacitor of input.
When in compensation process, if system increase reactive requirement DQload(svg), then now, the original SVG total nothing of load
Work(Qload(svg)Do not compensate part add DQload(svg)As the total idle F of SVG load, mended using F as total compensation rate
Repay；Or after the completion of compensation, if system increase reactive requirement DQload(svg), then now, DQload(svg)It is used as total compensation rate
Compensate.
When in compensation process or after the completion of compensation, system reduces reactive requirement DQload(svg), then SVG is counter to mend input, and
And, if the common benefit capacitor put into and meet excision condition Qmax(gcap)<DQload(svg), then cut off this and mend capacitor altogether
To reduce, SVG is counter to mend input, if next, the common benefit capacitor put into, which also has, meets capacity requirement, then continue to cut off
Capacitor is mended altogether, until DQload(svg)The common benefit capacitor for not being available for excision is reduced to, if next also SVG is counter mends throwing
Enter, now anti-A, B, C threephase load mended is idle needed for SVG is designated as FQ respectivelyaload(svg)、FQbload(svg)、FQcload(svg), that
Judge whether to cut off point benefit capacitor, i.e., for A phases, if the Q of point benefit capacitoramax(fcap)<FQaload(svg), then cut
Except the A phases of this point of benefit capacitor, for B phases, if the Q of point benefit capacitorbmax(fcap)<FQbload(svg), then cut off this point
The B phases of capacitor are mended, for C phases, if the Q of point benefit capacitorcmax(fcap)<FQcload(svg), then cut off this point and mend electric capacity
The C phases of device, until SVG FQaload(svg)、FQbload(svg)、FQcload(svg)It is reduced to point benefit capacitor for not being available for excision.
After such scheme, compared with prior art, the present invention has advantages below：First SVG inputs, harmonic carcellation,
Compensating reactive power, can relatively quickly steady load, then, put into successively and dynamically and mend altogether and point benefit capacitor, reduce SVG
The reactive-load compensation sent, so as to reduce SVG workload；After load is exited, benefit was sponged rapidly using SVG dynamic responses
Idle amount, then cut off successively and dynamically and mend altogether and point benefit capacitor again, it is dynamic that whole compensation process can both play SVG
The characteristic of fast response time, suppresses voltage fluctuation and flicker, the defect of SVG off-capacities is also can overcome the disadvantages that, while being operated in SVG
Light load conditions, i.e. light work amount state, extension SVG service lifes, and the accurate compensation of realization, suppression voltage pulsation and flickering
Ability is greatly improved；In a word, the application puts into SVG in advance, in the hope of target subharmonic in first elimination system, at the same improve power because
Numerical value, is then compensated by common benefit and point benefit capacitor input or excision, reduces SVG workloads, to reach system balancing, this
The proposition of scheme optimizes compensating for resource configuration, gives full play to SVG rapid dynamic response speed and mends altogether and point benefit capacitor benefit
The big and stable advantage of capacity is repaid, the compensation capacity of whole system is improved, alleviates SVG loads, extend SVG and use the longevity
Life, reduces cost of compensation, while the application has guarantee compensation quality, reduces the advantage of SVG workload.
The present invention also propose a kind of mixed compensation device, it include SVG, the current detecting unit for detecting power network and
Some intelligent capacitors, it also includes the first controller, and SVG controller is designated as second controller, each intelligent capacitor
Controller is designated as the 3rd controller, and the communication terminal of second controller, the communication terminal of each 3rd controller are controlled with first respectively
The communication terminal electrical connection of device, the sampling end of the first controller, the sampling end of second controller, the sampling end point of each 3rd controller
Do not electrically connected with current detecting unit；SVG compensating end and the compensating end of each intelligent capacitor are electrically connected with power network respectively.
After said structure, compared with prior art, the present invention has advantages below：First controller is equivalent to preferential
Controller, the first controller obtains the state of power network by current detecting unit, and control instruction then is sent into the second control
Device and each 3rd controller, second controller and each 3rd controller preferentially perform the control instruction, so that realize can
Coordinate SVG and the purpose both each intelligent capacitor, such as by coordination after, because SVG reaction speeds are fast, if in intelligence
Before capacitor is not cut off, SVG by intelligent capacitor input part it is counter mended, if reaching system balancing again, intelligence
Energy capacitor will not be cut off, can be to avoid, in addition, the SVG of the application and each intelligent capacitor still lead to the problem of such
Excessive current detection unit obtains the state of power network, once the first controller breaks down, SVG and each intelligent capacitor are remained able to
Respective normal work；Summary, the application, which has, can coordinate both SVG and intelligent capacitor, and when breaking down, just
Normal SVG or intelligent capacitor remains able to the advantage of normal work.
As an improvement, current detecting unit includes net side CT and carries out the two of secondary detection to the signal acquired in net side CT
Secondary CT, the signal acquired in net side CT is delivered to the sampling end of the first controller and the sampling end of second controller respectively, secondary
Signal acquired in CT is delivered to the sampling end of each 3rd controller respectively, and CT is current transformer, and so, overall structure is obtained
Simplify, and without being respectively provided with CT no-load voltage ratio structures at each intelligent capacitor end.
As an improvement, the first controller is provided with the first adapter unit and the second adapter unit；First adapter unit include with
First connection end of secondary CT electrical connection and the first forwarding end direct-connected with first connection end, the first forwarding end and each the
The sampling end electrical connection of three controllers, the first forwarding end also includes communication line, the communication line one end and the first controller
Communication terminal electrical connection, the communication line other end electrically connects with the communication terminal of each 3rd controller；Second adapter unit includes
The second connection end for being electrically connected with net side CT and the second forwarding end direct-connected with second connection end, the second forwarding end and the
The sampling end electrical connection of two controllers, so, overall structure is simplified, and greatly reduces wiring quantity, while wiring is shorter, separately
Outside, due to being direct-connected switching, even if so interconnecting device itself failure, will not also hinder the conveying of signal.
As an improvement, the first forwarding end is electrically connected with the sampling end of each 3rd controller, the first forwarding end also includes
Communication line, the communication line one end is electrically connected with the communication terminal of the first controller, the communication line other end and each 3rd control
The communication terminal electrical connection of device processed, refers to：The sampling end of each 3rd controller be equipped with the 3rd connection end comprising communication line with
And threeth comprising the communication line forwarding end direct-connected with the 3rd connection end, the first forwarding end and first intelligent capacitor
The 3rd connection end electrical connection of 3rd controller, the 3rd forwarding end and second of the 3rd controller of first intelligent capacitor
The 3rd connection end electrical connection of 3rd controller of individual intelligent capacitor, the of the 3rd controller of second intelligent capacitor
Three connection ends are electrically connected with the 3rd connection end of the 3rd controller of the 3rd intelligent capacitor, the like with realize will be secondary
Current detection signal that CT is detected and each 3rd controller is delivered to communication signal that the first controller is communicated, here
The signal transmission between the first controller and each intelligent capacitor is mainly solved, purpose is equally that overall structure is simplified, pole
It is big to reduce wiring quantity, while wiring is shorter, further, since be direct-connected switching, even if so interconnecting device itself breaks down,
Also the conveying of signal will not be hindered.
As an improvement, the interface that the first connection end, the first forwarding end, each 3rd connection end and the 3rd forwarding end are used is equal
For telephone line interface, so, simple in construction, firmly, contact is reliable for wiring.
As an improvement, the communication terminal of second controller electrically connects used interface with the communication terminal of the first controller is
485 communication interfaces, so, simple in construction, communications protocol is ripe, and compatibility is good.
As an improvement, some intelligent capacitors include intelligence mends capacitor and intelligence point benefit capacitor altogether, it is so, idle to mend
Repay effect more preferable.
Brief description of the drawings
Fig. 1 is the principle schematic of mixed compensation device of the present invention.
Fig. 2 is the related enlarged diagram of the first controller.
Fig. 3 is the related enlarged diagrams of SVG.
Fig. 4 is the related enlarged diagram of intelligent capacitor.
Shown in figure, the 1, first connection end, the 2, first forwarding end, the 3, second connection end, the 4, second forwarding end, the 5, the 3rd connects
Connect end, the 6, the 3rd forwarding end.
Embodiment
The present invention is further detailed explanation below：
Embodiment one,
A kind of mixed compensation method, each mends condenser capacity and is designated as Q altogethermax(gcap), the three-phase of each point of benefit capacitor
Capacity is designated as Qamax(fcap)、Qbmax(fcap)、Qcmax(fcap), compensation process is：
If being capacitive reactive power compensation needed for system, then SVG is put into advance, remember that SVG load is always idle and be
Qload(svg), i.e., total compensation rate is Qload(svg), then, if common benefit condenser capacity Qmax(gcap)<Qload(svg), then throw
Enter this and mend capacitor altogether, now SVG loads are total idle for E=Qload(svg)The capacity of-common benefit the capacitor this time put into
Qmax(gcap)If there is the capacity Q for mending capacitor altogethermax(gcap)<E, then continuation input is corresponding to mend capacitor altogether, now
The total idle capacity Q for the G=E- common benefit capacitors this time put into of SVG loadsmax(gcap)If there is the appearance for mending capacitor altogether
Measure Qmax(gcap)<G, then continuation input is corresponding to mend capacitor altogether, the like, until the total idle Q of SVG loadsload(svg)Subtract
It is small to be not available for input common benefit capacitor, if next also need compensation, now SVG compensation A, B, C threephase load it is idle
Q is designated as respectivelyaload(svg)、Qbload(svg)、Qcload(svg), then judge whether to put into point benefit capacitor, i.e., for A phases, if dividing
Mend the Q of capacitoramax(fcap)<Qaload(svg), then the A phases of this point of benefit capacitor are put into, for B phases, if a point benefit capacitor
Qbmax(fcap)<Qbload(svg), then the B phases of this point of benefit capacitor are put into, for C phases, if point benefit capacitor
Qcmax(fcap)<Qcload(svg), then the C phases of this point of benefit capacitor are put into, now, for A phases, the A phase loads of SVG compensation are idle
Reduce, i.e. H=Qaload(svg)-Qamax(fcap), or, for B phases, the B phase loads of SVG compensation are idle to be reduced, i.e. I=
Qbload(svg)-Qbmax(fcap), or, for C phases, the C phase loads of SVG compensation are idle to be reduced, i.e. J=Qcload(svg)-
Qcmax(fcap), next, it is judged that the input of point benefit capacitor, is to regard H, I, J as benchmark, i.e. Qaload(svg)、
Qbload(svg)、Qcload(svg)H, I, J are replaced with respectively, if being judged as input, then for A phases, the A phase loads of SVG compensation are idle
Continue to reduce, i.e. K=Qaload(svg)- Qamax(fcap), or, for B phases, the B phase loads of SVG compensation are idle to be continued to reduce, i.e. L
=Qbload(svg) -Qbmax(fcap), or, for C phases, the C phase loads of SVG compensation are idle to be continued to reduce, i.e. M=Qcload(svg) -
Qcmax(fcap), next, be to replace with K, L, M respectively using K, L, M as benchmark, i.e. H, I, J, the like, compare every time
Compared with benchmark be the SVG compensation after reducing A phase loads are idle, the B phase loads of SVG compensation are idle, the C phase loads of SVG compensation
It is idle, until SVG Qaload(svg)、Qbload(svg)、 Qcload(svg)Point benefit capacitor for not being available for input is reduced to, this successively decreases
The input of capacitor is mended in process, similar judgement altogether.
When in compensation process, if system increase reactive requirement DQload(svg), then now, the original SVG total nothing of load
Work(Qload(svg)Do not compensate part add DQload(svg)As the total idle F of SVG load, mended using F as total compensation rate
Repay；Or after the completion of compensation, if system increase reactive requirement DQload(svg), then now, DQload(svg)It is used as total compensation rate
Compensate.
When in compensation process or after the completion of compensation, system reduces reactive requirement DQload(svg), then SVG is counter to mend input, and
And, if the common benefit capacitor put into and meet excision condition Qmax(gcap)<DQload(svg), then cut off this and mend capacitor altogether
To reduce, SVG is counter to mend input, and now, SVG is counter, and input of mending is reduced to DQload(svg)- Qmax(gcap)If, next, put into
Benefit capacitor, which also has, altogether meets capacity requirement, then continues to cut off and mends capacitor altogether, judges whether to meet capacity requirement use
Rule is the common benefit capacitor Q put intomax(gcap)<DQload(svg), simply excision judges compared DQ every timeload(svg)Should
Replace with that the SVG after reducing every time is counter to mend input, up to DQload(svg)The common benefit capacitor for not being available for excision is reduced to, is connect down
If coming, also SVG is counter to mend input, and now anti-A, B, C threephase load mended is idle needed for SVG is designated as FQ respectivelyaload(svg)、
FQbload(svg)、FQcload(svg), then judge whether to cut off point benefit capacitor, i.e., for A phases, if point benefit capacitor
Qamax(fcap)<FQaload(svg), then the A phases of this point of benefit capacitor are cut off, for B phases, if point benefit capacitor
Qbmax(fcap)<FQbload(svg), then the B phases of this point of benefit capacitor are cut off, for C phases, if point benefit capacitor
Qcmax(fcap)<FQcload(svg), then the C phases of this point of benefit capacitor are cut off, until SVG FQaload(svg)、FQbload(svg)、
FQcload(svg)Point benefit capacitor for not being available for excision is reduced to, rule of successively decreasing here is also by FQaload(svg)、
FQbload(svg)、FQcload(svg)Anti- idle be used as of A, B, C threephase load mended needed for replacing with the SVG after reducing every time is compared
Benchmark is compared.
Embodiment two, a kind of mixed compensation device,
It includes SVG, current detecting unit and some intelligent capacitors for detecting power network, and it also includes the first control
Device processed, SVG controller is designated as second controller, and the controller of each intelligent capacitor is designated as the 3rd controller, the second control
The communication terminal of the communication terminal of device processed, the communication terminal of each 3rd controller respectively with the first controller is electrically connected, the first controller
Sampling end, the sampling end of second controller, the sampling end of each 3rd controller are electrically connected with current detecting unit respectively；SVG's
Compensating end and the compensating end of each intelligent capacitor are electrically connected with power network respectively.
First controller mainly includes power module, sampling module, control module and display module, and the display module is in figure
Not shown in, display module is as man-machine interface, and power module is used to power, and power module is from power network power taking.First controller
By the parameters of electric power in acquisition system, calculating analysis is carried out, then to SVG and the humorous formula intelligent low-pressure electric capacitor compensator of suppression
Compensation is controlled, compensation principle is realized, to reach the desired value of system power factor；Control module uses chip
STM32F103RC is used as processing core part；Display module includes model ZXM12864C1 LCDs.
SVG mainly includes control chip, current sampling unit, capacitor, reactor, IGBT module and display module group
It is the control module around control chip formation into, second controller, SVG is by 485 communications and the first controller communication, by the
One controller is controlled, and SVG has the function of harmonic carcellation, therefore the first controller priority acccess control SVG input compensations, eliminates system
In harmonic wave, reduce vibration, so as to protect SVG and intelligent capacitor；SVG also possesses the function of reactive-load compensation, its quick response
Speed, can cause compensation process for dynamic compensate, as long as idle environment changes in system, SVG preferentially put into it is idle, so
The first controller is analyzed afterwards, if to put into the humorous formula Intelligent low-voltage power capacitor of suppression；In intelligent capacitor input compensation
Afterwards, the remaining small part of SVG compensation is idle, reaches the desired value of system power factor.
Intelligent capacitor mainly includes control module, breaker, capacitor, reactor and magnetic latching relay, the control
Module is the 3rd controller；Due to using intelligent capacitor, with control module, can MANET, so passing through second CT sampling
To intelligent capacitor, make it in the first controller and SVG failures, can also carry out switching compensation, prevent system electrical condition ripple
It is dynamic big.
SVG can using commercially available static reacance generator or referred to as Active Power Filter-APF, such as Hangzhou it is bright it is safe electrically
This kind of product of institute of Co., Ltd production and sales, intelligent capacitor can use the commercially available humorous formula low-voltage reactive compensator of suppression, than
Such as this kind of product of Hangzhou institute of Sheng Tai Electric Applicance Co., Ltd production and sales.
Current detecting unit includes net side CT and the secondary CT of secondary detection, net is carried out to the signal acquired in net side CT
Signal acquired in the CT of side is delivered to the sampling end of the first controller and the sampling end of second controller respectively, acquired in secondary CT
Signal be delivered to the sampling end of each 3rd controller respectively.
First controller is provided with the first adapter unit and the second adapter unit；First adapter unit includes and secondary CT electricity
First connection end 1 of connection and the first forwarding end 2 direct-connected with first connection end 1, the first forwarding end 2 and each 3rd control
The sampling end electrical connection of device processed, the first forwarding end 2 also includes communication line, and the communication line one end is logical with the first controller
End electrical connection is interrogated, the communication line other end is electrically connected with the communication terminal of each 3rd controller；Second adapter unit includes and net
Second connection end 3 of side CT electrical connections and the second forwarding end 4 direct-connected with second connection end 3, the second forwarding end 4 and the
The sampling end electrical connection of two controllers.
The first forwarding end 2 is electrically connected with the sampling end of each 3rd controller, and the first forwarding end 2 also includes connection
Road, the communication line one end is electrically connected with the communication terminal of the first controller, the communication line other end and each 3rd controller
Communication terminal is electrically connected, and is referred to：The sampling end of each 3rd controller be equipped with the 3rd connection end 5 comprising communication line and with this
The of the direct-connected forwarding of the 3rd comprising the communication line end 6 in 3rd connection end 5, the first forwarding end 2 and first intelligent capacitor
3rd connection end 5 of three controllers is electrically connected, the 3rd forwarding end 6 and second of the 3rd controller of first intelligent capacitor
3rd connection end 5 of the 3rd controller of individual intelligent capacitor is electrically connected, the 3rd controller of second intelligent capacitor
3rd connection end 5 is electrically connected with the 3rd connection end 5 of the 3rd controller of the 3rd intelligent capacitor, the like with realize will
Current detection signal that secondary CT is detected and it is delivered to each 3rd control with communication signal that the first controller is communicated
Device.
The interface that first connection end 1, first forwarding end 2, the forwarding end 6 of each 3rd connection end 5 and the 3rd are used is electricity
Talk about line interface.
The communication terminal of second controller electrically connects used interface with the communication terminal of the first controller and connect for 485 communications
Mouthful.
Some intelligent capacitors include intelligence and mend capacitor and intelligence point benefit capacitor altogether.
SVG includes dc source, the display screen exported with keyboard, and dc source one end is electrically connected with power network, dc source
The other end is electrically connected with display screen to be powered to display screen, and display screen is electrically connected with the data interaction end of the first controller.
The application mixed compensation device can be controlled using the compensation logic of prior art, such as the first controller is preferential
The harmonic wave in SVG input compensations, elimination system is controlled, reduces vibration, as long as idle environment changes in system, SVG is preferential
Input is idle, then considers further that the humorous formula Intelligent low-voltage power capacitor of input suppression；After intelligent capacitor input compensation, SVG is mended
Repay that remaining small part is idle, so as to reach the desired value of system power factor.
A kind of embodiment three, mixed compensation device for running embodiment one, the difference with embodiment two is using implementation
The mixed compensation method of example one, it is more advanced, coordinate SVG and each intelligence by the mixed compensation method of embodiment one by the first controller
The input of energy capacitor or excision.
Described above is only the better embodiment of the present invention, therefore all constructions according to described in present patent application scope,
The equivalent change or modification that feature and principle are done, is included in the range of present patent application.
Claims (10)
1. a kind of mixed compensation method, it is characterised in that each mend condenser capacity altogether and be designated as Qmax(gcap), each point is mended electricity
Three compatible amounts of container are designated as Qamax(fcap)、Qbmax(fcap)、Qcmax(fcap), compensation process is：
If being capacitive reactive power compensation needed for system, then SVG is put into advance, and it is Q that note SVG load is always idleload(svg), so
Afterwards, if common benefit condenser capacity Qmax(gcap)<Qload(svg), then put into this and mend capacitor altogether, now SVG loads are total idle
For E=Qload(svg)The capacity Q of-common benefit capacitor this time put intomax(gcap)If there is the capacity for mending capacitor altogether
Qmax(gcap)<E, then continuation input is corresponding to mend capacitor altogether, until the total idle Q of SVG loadsload(svg)It is reduced to and is not available for
The common benefit capacitor of input, if next also needing compensation, A, B, C threephase load of now SVG compensation are idle to be designated as respectively
Qaload(svg)、Qbload(svg)、Qcload(svg), then judge whether to put into point benefit capacitor, i.e., for A phases, if a point benefit capacitor
Qamax(fcap)<Qaload(svg), then the A phases of this point of benefit capacitor are put into, for B phases, if point benefit capacitor
Qbmax(fcap)<Qbload(svg), then the B phases of this point of benefit capacitor are put into, for C phases, if the Q of point benefit capacitorcmax(fcap)
<Qcload(svg), then the C phases of this point of benefit capacitor are put into, until SVG Qaload(svg)、Qbload(svg)、Qcload(svg)It is reduced to
It is not available for point benefit capacitor of input.
2. mixed compensation method according to claim 1, it is characterised in that when in compensation process, if system increases nothing
Work(demand DQload(svg), then now, the original SVG total idle Q of loadload(svg)Do not compensate part add DQload(svg)Make
For the SVG total idle F of load, compensated using F as total compensation rate；Or after the completion of compensation, if system increases idle need
Seek DQload(svg), then now, DQload(svg)Compensated as total compensation rate.
3. mixed compensation method according to claim 1, it is characterised in that when in compensation process or after the completion of compensation, be
System reduces reactive requirement DQload(svg), then SVG is counter to mend input, also, the common benefit capacitor if having put into and meeting is cut
Except condition Qmax(gcap)<DQload(svg), then cut off this and mend capacitor altogether SVG is counter to mend input to reduce, if next, put into
Common benefit capacitor also have and meet capacity requirement, then continue to cut off and mend capacitor altogether, until DQload(svg)It is reduced to and may not be used
For the common benefit capacitor of excision, if next also SVG is counter mends input, now anti-A, B, C threephase load mended is idle needed for SVG
FQ is designated as respectivelyaload(svg)、FQbload(svg)、FQcload(svg), then judge whether to cut off point benefit capacitor, i.e., for A phases, such as
Fruit has a point Q for benefit capacitoramax(fcap)<FQaload(svg), then the A phases of this point of benefit capacitor are cut off, for B phases, if dividing
Mend the Q of capacitorbmax(fcap)<FQbload(svg), then the B phases of this point of benefit capacitor are cut off, for C phases, if a point benefit electric capacity
The Q of devicecmax(fcap)<FQcload(svg), then the C phases of this point of benefit capacitor are cut off, until SVG FQaload(svg)、FQbload(svg)、
FQcload(svg)It is reduced to point benefit capacitor for not being available for excision.
4. a kind of mixed compensation device, it includes SVG, current detecting unit and some intelligent capacitors for detecting power network
Device, it is characterised in that it also includes the first controller, SVG controller is designated as second controller, the control of each intelligent capacitor
Device processed is designated as the 3rd controller, the communication terminal of second controller, each 3rd controller communication terminal respectively with the first controller
Communication terminal electrical connection, the sampling end of the first controller, the sampling end of second controller, each 3rd controller sampling end difference
Electrically connected with current detecting unit；SVG compensating end and the compensating end of each intelligent capacitor are electrically connected with power network respectively.
5. mixed compensation device according to claim 4, it is characterised in that current detecting unit includes net side CT and to net
Signal acquired in the CT of side carries out the secondary CT of secondary detection, and the signal acquired in net side CT is delivered to the first controller respectively
The sampling end of sampling end and second controller, the signal acquired in secondary CT is delivered to the sampling end of each 3rd controller respectively.
6. mixed compensation device according to claim 5, it is characterised in that the first controller provided with the first adapter unit and
Second adapter unit；First adapter unit include the first connection end (1) for being electrically connected with secondary CT and with first connection end
(1) the first direct-connected forwarding end (2), first forwarding end (2) is electrically connected with the sampling end of each 3rd controller, first forwarding
(2) are held also to include communication line, the communication line one end is electrically connected with the communication terminal of the first controller, the communication line other end
Electrically connected with the communication terminal of each 3rd controller；Second adapter unit include the second connection end (3) for being electrically connected with net side CT with
And second forwarding end (4) direct-connected with second connection end (3), second forwarding end (4) and the sampling end electricity of second controller
Connection.
7. mixed compensation device according to claim 6, it is characterised in that first forwarding end (2) and each 3rd control
The sampling end electrical connection of device, first forwarding end (2) also includes communication line, and the communication line one end is logical with the first controller
End electrical connection is interrogated, the communication line other end is electrically connected with the communication terminal of each 3rd controller, referred to：Each 3rd controller is adopted
Sample end be equipped with the 3rd connection end (5) comprising communication line and with the 3rd connection end (5) it is direct-connected include communication line
The 3rd forwarding end (6), the first forwarding end (2) and the 3rd connection end (5) electricity of the 3rd controller of first intelligent capacitor
Connection, the 3rd forwarding end (6) of the 3rd controller of first intelligent capacitor and the 3rd control of second intelligent capacitor
The 3rd connection end (5) electrical connection of device processed, the 3rd connection end (5) and the 3rd of the 3rd controller of second intelligent capacitor
The 3rd connection end (5) electrical connection of 3rd controller of individual intelligent capacitor, the like secondary CT is detected with realizing
Current detection signal and it is delivered to each 3rd controller with communication signal that the first controller is communicated.
8. mixed compensation device according to claim 7, it is characterised in that the first connection end (1), the first forwarding end (2),
The interface that each 3rd connection end (5) and the 3rd forwarding end (6) are used is telephone line interface.
9. mixed compensation device according to claim 4, it is characterised in that the communication terminal of second controller and the first control
It is 485 communication interfaces that the communication terminal of device, which electrically connects used interface,.
10. mixed compensation device according to claim 4, it is characterised in that some intelligent capacitors include intelligence and mended altogether
Capacitor and intelligence point benefit capacitor.
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| CN201710385617.3A CN107221938A (en) | 2017-05-26 | 2017-05-26 | Mixed compensation method and mixed compensation device |
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