CN106921157A - A kind of AC singlephase earth fault control method of flexible ring net controller - Google Patents
A kind of AC singlephase earth fault control method of flexible ring net controller Download PDFInfo
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- CN106921157A CN106921157A CN201511001470.0A CN201511001470A CN106921157A CN 106921157 A CN106921157 A CN 106921157A CN 201511001470 A CN201511001470 A CN 201511001470A CN 106921157 A CN106921157 A CN 106921157A
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- earth fault
- singlephase earth
- voltage
- flexible ring
- ring net
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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
-
- 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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention provides a kind of AC singlephase earth fault control method of flexible ring net controller, including step 1：The three-phase voltage of real-time detection AC system；Step 2：Judge whether AC system occurs singlephase earth fault；Step 3：Obtain the maximum of the voltage peak of non-faulting phase；Step 4：Redefine the DC voltage command value of AC system；Step 5：Start negative-sequence current control and zero-sequence current control；Step 6：Judge whether singlephase earth fault is removed, DC voltage command value when DC voltage command value is recovered to AC system normally to run will be stated if removing.Compared with prior art, a kind of AC singlephase earth fault control method of flexible ring net controller that the present invention is provided, during it there is singlephase earth fault in AC, DC voltage is reduced in short-term, using the negative voltage fan-out capability for mixing sub-modular structure, alternating current is remained in that the sinusoidal waveform of three-phase symmetrical, improve the reliability of flexible ring net controller.
Description
Technical field
The present invention relates to electric and electronic technical field, and in particular to a kind of AC singlephase earth fault control of flexible ring net controller
Method processed.
Background technology
With the continuous increase of transmission load, the development of power network is set up, and electromagnetic looped network is constantly being formed again.Electromagnetism general at present
The method of unlinking of looped network is to install AC circuit breaker additional or carry out sub-area division in Xie Huandianchu to run, but the precondition of the method is
Power network has been equipped with the primary condition of open loop operation.When electromagnetic looped network is difficult to open loop operation but meets the condition of security constraint, can
Using by technologies such as THE UPFC, phase shifter, IPC, controlled series compensations, adjusted by FACTS devices
Voltage phase angle eliminates the circulation in electromagnetic looped network, limiting short-circuit current, optimizes the internetwork power distribution of high low pressure, improves
System operation reliability and economy, but such device can not fundamentally solve the problems, such as electromagnetic looped network.Flexible ring net controller
It is back-to-back flexible direct current, the quick independent control of active power and reactive power can be realized；When AC system breaks down,
Flexible direct current does not provide short circuit current, can promptly isolate failure, and with black starting-up function, to solve the problems, such as that electromagnetic looped network is provided
A kind of selection.
But during using being based on mixing the flexible ring net controller system schema of sub-modular structure transverter without converter power transformer, work as exchange
After system occurs ground short circuit failure, because not having converter power transformer isolated fault, false voltage can directly act on transverter,
Larger false voltage stress and current stress are caused, equipment damage is easily caused.Accordingly, it is desirable to provide one kind can be in AC
During generation singlephase earth fault, the fault control method of DC voltage is reduced in short-term, prevent failure to be delivered to opposite side exchange system
System.
The content of the invention
The need in order to meet prior art, the invention provides a kind of AC singlephase earth fault control of flexible ring net controller
Method processed.
The technical scheme is that：
Methods described includes：
Step 1：The three-phase voltage of real-time detection AC system；
Step 2：Judge whether the AC system occurs singlephase earth fault；
Step 3：After obtaining the AC system generation singlephase earth fault, the maximum U of the voltage peak of non-faulting phases_max；
Step 4：Redefine the DC voltage command value U' of the AC systemd；
Step 5：Start negative-sequence current control and zero-sequence current control；
Step 6：Judge whether the singlephase earth fault is removed, by the DC voltage command value U' if removingdRecover best friend
DC voltage command value U when streaming system normally runsd。
Preferably, the phase voltage in the step 2 when AC system is reduced to 0, and two-phase voltage is raised rapidly in addition, then exchanged
There is singlephase earth fault in system.
Preferably, DC voltage command value U' in the step 4dSpan be：U'd＜ 3Ud-2Us_max；
Wherein, UdDC voltage command value when normally being run for AC system.
Preferably, the topological structure of the flexible ring net controller includes the first transverter and the second transverter；First change of current
Device and the second transverter are directly accessed AC system；
The bridge arm of every phase half of first transverter is composed in series by a full-bridge submodule and at least one half-bridge submodule；
The bridge arm of every phase half of second transverter is also composed in series by a full-bridge submodule and at least one half-bridge submodule.
Compared with immediate prior art, excellent effect of the invention is：
1st, a kind of AC singlephase earth fault control method of flexible ring net controller that the present invention is provided, can completely inhibit friendship
The overvoltage and overcurrent of side are flowed, prevents transverter from bearing too high false voltage and electric current, improved the service life of equipment and be
The reliability of system；
2nd, a kind of AC singlephase earth fault control method of flexible ring net controller that the present invention is provided, the fluctuation of DC voltage
Not over ± 1%, DC current fluctuation suppresses within ± 20%, can prevent the power electronic devices in transverter because excessively electric
Flow and damage；
3rd, the AC singlephase earth fault control method of a kind of flexible ring net controller that the present invention is provided, occurs single in AC
During phase earth fault, DC voltage is reduced in short-term, using the negative voltage fan-out capability for mixing sub-modular structure, make current conversion station defeated
The alternating current for going out remains in that the sinusoidal waveform of three-phase symmetrical, can suppress fault component, prevents failure to be delivered to opposite side and exchanges
System, improves the reliability of flexible ring net controller.
Brief description of the drawings
The present invention is further described below in conjunction with the accompanying drawings.
Fig. 1：The topological structure schematic diagram of flexible ring net controller in the embodiment of the present invention；
Fig. 2：Response wave shape figure of the half-bridge submodule when AC system is normally run in the embodiment of the present invention；
Fig. 3：Response wave shape figure of the half-bridge submodule when AC system occurs singlephase earth fault in the embodiment of the present invention；
Fig. 4：Mix response wave shape figure of the submodule when AC system is normally run in the embodiment of the present invention；
Fig. 5：Mix response wave shape figure of the submodule when AC system occurs singlephase earth fault in the embodiment of the present invention；
Fig. 6：The AC singlephase earth fault control method flow chart of a kind of flexible ring net controller in the embodiment of the present invention；
Fig. 7：Alternating voltage waveform figure when fault-free is controlled in the embodiment of the present invention；
Fig. 8：AC current waveform figure when fault-free is controlled in the embodiment of the present invention；
Fig. 9：DC voltage waveform figure when fault-free is controlled in the embodiment of the present invention；
Figure 10：Dc current waveform figure when fault-free is controlled in the embodiment of the present invention；
Figure 11：Alternating voltage waveform figure during Fault Control is added in the embodiment of the present invention；
Figure 12：AC current waveform figure during Fault Control is added in the embodiment of the present invention；
Figure 13：DC voltage waveform figure during Fault Control is added in the embodiment of the present invention；
Figure 14：Dc current waveform figure during Fault Control is added in the embodiment of the present invention.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein it is identical from start to finish or
Similar label represents same or similar element or the element with same or like function.Below with reference to Description of Drawings
Embodiment is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
A kind of implementation such as Fig. 6 institutes of the AC singlephase earth fault control method of flexible ring net controller that the present invention is provided
Show, specially：
1st, the three-phase voltage of real-time detection AC system.
2nd, judge whether AC system occurs singlephase earth fault.
When the phase voltage for detecting AC system is reduced to 0 in the present embodiment, two-phase voltage is raised rapidly in addition, then AC system
Generation singlephase earth fault.
3rd, after obtaining AC system generation singlephase earth fault, the maximum U of the voltage peak of non-faulting phases_max。
4th, the DC voltage command value U' of AC system is redefinedd。
DC voltage command value U' in the present embodimentdSpan be：U'd＜ 3Ud-2Us_max；
Wherein, UdDC voltage command value when normally being run for AC system.
5th, negative-sequence current control and zero-sequence current control are started.
6th, judge whether singlephase earth fault is removed, by DC voltage command value U' if removingdRecover to AC system normally to transport
DC voltage command value U during rowd。
Topological structure such as Fig. 1 institutes of the flexible ring net controller of above-mentioned AC singlephase earth fault control method are used in the present invention
Show, it includes the first transverter and the second transverter；First transverter and the second transverter are directly accessed AC system.
Wherein,
The bridge arm of every phase half of the first transverter is composed in series by a full-bridge submodule and at least one half-bridge submodule, and second changes
The bridge arm of every phase half for flowing device is also composed in series by a full-bridge submodule and at least one half-bridge submodule.I.e. in the present embodiment
One changes sharp weapon and the second transverter is the transverter being made up of mixing submodule.
The response wave shape figure of half-bridge submodule and mixing submodule when AC system is normally run is respectively such as Fig. 2 and 4 in the present embodiment
Shown, the response wave shape figure of half-bridge submodule and mixing submodule when in AC system generation singlephase earth fault is respectively such as Fig. 3
With shown in 5.
The alternating voltage ripple of flexible ring net controller during above-mentioned AC singlephase earth fault control method is provided without in the present embodiment
Shape, AC current waveform, DC voltage waveform and dc current waveform are respectively as shown in Fig. 7,8,9 and 10；Using above-mentioned friendship
Alternating voltage waveform, AC current waveform, the DC voltage ripple of flexible ring net controller after stream side singlephase earth fault control method
Shape and DC current flow waveform are respectively as shown in Figure 11,12,13 and 14.
Can be obtained by Fig. 7-14, AC can produce about 1.35 times excessively electric after being broken down when the control method is provided without
Pressure and 2 times of overcurrent, and using the overvoltage and overcurrent of AC can be completely inhibited after the control method, prevent the change of current
Device bears too high false voltage and electric current, improves the service life of equipment and the reliability of system.Meanwhile, it is being provided without the control
The common mode concussion fluctuation about ± 20% or so that DC voltage is produced after being broken down during method processed, the fluctuation that DC current is produced about exists
± 130% or so, and use the control method after DC voltage fluctuation not over ± 1%, DC current fluctuation suppress ±
Within 20%, can prevent the power electronic devices in transverter from being damaged because of overcurrent.
Finally it should be noted that：Described embodiment is only some embodiments of the present application, rather than whole embodiments.
Based on the embodiment in the application, those of ordinary skill in the art obtained under the premise of creative work is not made it is all its
His embodiment, belongs to the scope of the application protection.
Claims (4)
1. the AC singlephase earth fault control method of a kind of flexible ring net controller, it is characterised in that methods described includes：
Step 1：The three-phase voltage of real-time detection AC system；
Step 2：Judge whether the AC system occurs singlephase earth fault；
Step 3：After obtaining the AC system generation singlephase earth fault, the maximum U of the voltage peak of non-faulting phases_max；
Step 4：Redefine the DC voltage command value U' of the AC systemd；
Step 5：Start negative-sequence current control and zero-sequence current control；
Step 6：Judge whether the singlephase earth fault is removed, by the DC voltage command value U' if removingdRecover best friend
DC voltage command value U when streaming system normally runsd。
2. a kind of AC singlephase earth fault control method of flexible ring net controller as claimed in claim 1, its feature exists
In the phase voltage in the step 2 when AC system is reduced to 0, and two-phase voltage is raised rapidly in addition, then AC system occurs
Singlephase earth fault.
3. a kind of AC singlephase earth fault control method of flexible ring net controller as claimed in claim 1, its feature exists
In, in the step 4, DC voltage command value U'dSpan be：U'd＜ 3Ud-2Us_max；
Wherein, UdDC voltage command value when normally being run for AC system.
4. a kind of AC singlephase earth fault control method of flexible ring net controller as claimed in claim 1, its feature exists
In the topological structure of the flexible ring net controller includes the first transverter and the second transverter；First transverter and second
Transverter is directly accessed AC system；
The bridge arm of every phase half of first transverter is composed in series by a full-bridge submodule and at least one half-bridge submodule；
The bridge arm of every phase half of second transverter is also composed in series by a full-bridge submodule and at least one half-bridge submodule.
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| CN201511001470.0A CN106921157B (en) | 2015-12-28 | 2015-12-28 | Alternating-current side single-phase earth fault control method of flexible ring network controller |
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|---|---|---|---|
| CN201511001470.0A CN106921157B (en) | 2015-12-28 | 2015-12-28 | Alternating-current side single-phase earth fault control method of flexible ring network controller |
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| CN106921157B CN106921157B (en) | 2020-08-04 |
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