CN108923451A - Method and device for controlling extra-high voltage multi-end hybrid direct current device to overhaul valve bank to exit - Google Patents
Method and device for controlling extra-high voltage multi-end hybrid direct current device to overhaul valve bank to exit Download PDFInfo
- Publication number
- CN108923451A CN108923451A CN201810815323.4A CN201810815323A CN108923451A CN 108923451 A CN108923451 A CN 108923451A CN 201810815323 A CN201810815323 A CN 201810815323A CN 108923451 A CN108923451 A CN 108923451A
- Authority
- CN
- China
- Prior art keywords
- valve group
- voltage
- control
- soft straight
- constant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000012423 maintenance Methods 0.000 claims abstract description 75
- 230000003750 conditioning effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000009467 reduction Effects 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 description 15
- 230000005540 biological transmission Effects 0.000 description 11
- 101100020526 Pycnoporus cinnabarinus LCC3-1 gene Proteins 0.000 description 6
- 101100074140 Trametes versicolor LCC4 gene Proteins 0.000 description 6
- 230000008901 benefit Effects 0.000 description 6
- 101150075807 lcc1 gene Proteins 0.000 description 6
- 230000005611 electricity Effects 0.000 description 5
- 101150014615 LCC2 gene Proteins 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 101100409678 Mus musculus Psmb7 gene Proteins 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 244000131316 Panax pseudoginseng Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
Classifications
-
- 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]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses a method for controlling an extra-high voltage multi-terminal mixed direct current device to withdraw a maintenance valve group, which comprises the steps of sending a withdrawal instruction to the maintenance valve group to make the maintenance valve group withdraw from operation; when detecting that the maintenance valve bank is a conventional valve bank, sending a voltage reduction instruction to a flexible straight valve bank controlled by a fixed direct current voltage of the same pole as the conventional valve bank so as to reduce the direct current side voltage of the pole; when detecting that the maintenance valve bank is a flexible straight valve bank controlled by constant direct current voltage, sending an exit instruction to a conventional valve bank which is symmetrical to the flexible straight valve bank and has the same pole, and enabling the conventional valve bank to exit from operation; when detecting the gentle straight valves of maintenance valves for deciding direct current power control, to with gentle straight valves of gentle straight valves same utmost point fixed direct current voltage control send the step-down instruction, in order to reduce the direct current side voltage of utmost point simultaneously to with gentle straight valves of deciding direct current power control are symmetrical and the conventional valves of same utmost point send and withdraw from the instruction, make conventional valves withdraw from the operation. The frequency of the flexible and straight valve set on and off can be reduced.
Description
Technical field
The present invention relates to technical field of HVDC transmission more particularly to a kind of control extra-high voltage multiterminal mixed DC devices
Maintenance valve group exits method and device.
Background technique
In recent years, it is based on insulated gate bipolar transistor (English name：Insulated Gate Bipolar
Transistor, abbreviation IGBT) full-controlled device flexible direct current technology (VSC-HVDC) and its engineer application obtain rapid hair
Exhibition.Compared with traditional both ends customary DC transmits electricity (LCC-HVDC), mixed based on the multiterminal that customary DC is connected with flexible direct current
Direct current transportation has the advantage that：One can be achieved on multiple feed, more drop points by electricity, provide a kind of more flexible, quick
Power transmission mode；Second is that there are certain operation risks in tetanic weak friendship system for customary DC engineering, flexible direct current end is added
Hybrid system is constituted, the runnability of existing system, connection weak AC system, passive network and grid-connected power generation system are improved
Deng；Third is that the advantage by Traditional DC compared with low cost and running wastage, with flexible direct current in control performance, alternating current-direct current fault traversing
The technical advantage of ability etc. combines, and realizes more extensive, farther distance and more stable and reliable extra-high voltage direct-current transmission
System.
The removing of DC side failure is realized for cooperation customary DC, flexible direct current, which need to use, is based on having fault clearance ability
The modularization multi-level converter (Modular Multilevel Converter, MMC) of submodule, such as full-bridge submodule, such as
Shown in Fig. 1.By changing the quantity and parameter of the submodule of access MMC, different capacity, voltage class and harmonic wave ginseng can satisfy
Several requirement, in addition, the type MMC can quickly control DC side output voltage as needed.
In traditional extra-high voltage customary DC transmission system, when the single valve group of side pole is overhauled, move back
When running out, the DC voltage of the side pole is reduced to original half, to realize both ends dc-voltage balance, needs stoppage in transit pair
One valve group of side, the frequent throwing that sometimes will result in the soft straight valve group of opposite side is moved back, and presence is moved back in the frequent throwing of soft straight valve group
Reduce the risk of service life of equipment.And in extra-high voltage multiterminal element hybrid system, based on having fault clearance ability submodule
The MMC of block can flexibly control DC voltage.Currently, there are no one kind can be used for controlling extra-high voltage multiterminal mixed DC system
The method that system maintenance valve group exits.
Summary of the invention
The purpose of the embodiment of the present invention is that providing a kind of control extra-high voltage multiterminal mixed DC turnaround of unit valve group side of exiting
Method and device reduce the out of service of soft straight valve group when maintenance valve group is out of service, solve the problems, such as that valve group is frequently thrown and move back.
To achieve the above object, the embodiment of the present invention provides a kind of control extra-high voltage multiterminal mixed DC turnaround of unit valve group
Method is exited, including：
Exit instruction is sent to maintenance valve group, so that the maintenance valve group is out of service；
When detecting that the maintenance valve group is conventional valve group, to the constant DC voltage control with the same pole of the conventional valve group
Soft straight valve group send step-down instruction so that the soft straight valve group of the constant DC voltage control reduces the DC side electricity of the pole
It is pressed onto preset threshold；
When detecting that the maintenance valve group is the soft straight valve group of the constant DC voltage control, DC voltage is determined to described
The soft straight valve group of control is symmetrical and the conventional valve group of same pole sends exit instruction, so that the routine valve group exits fortune
Row；
Detect that the maintenance valve group is to determine dc power control to described when determining the soft straight valve group of dc power control
The soft straight valve group of the constant DC voltage control of the soft straight same pole of valve group send step-down instruction so that described determine direct current
The soft straight valve group of voltage-controlled system reduces the DC voltage of the pole to preset threshold, while determining what dc power controlled to described
Soft straight valve group is symmetrical and the same extremely described conventional valve group sends exit instruction, so that the routine valve group is out of service.
As an improvement of the above scheme, the preset threshold is 50 percent.
As an improvement of the above scheme, the conventional valve group includes high-end valve group and low side valve group；
The soft straight valve group of the constant DC voltage control includes high-end valve group and low side valve group；
The soft straight valve group for determining dc power control includes high-end valve group and low side valve group.
As an improvement of the above scheme, the conventional valve group is the conventional valve group of constant DC current control.
As an improvement of the above scheme, further include：
Adjust the electric current of the conventional valve group of constant DC current control described in sending end；
Adjust the power that the soft straight valve group of dc power control is determined described in receiving end.
As an improvement of the above scheme, exit instruction is sent to maintenance valve group described, so that the maintenance valve group is moved back
Further include before operating value out：
Obtain service valve group information；
Obtain it is described maintenance valve group described in pole.
To achieve the above object, the embodiment of the present invention also provides a kind of control extra-high voltage multiterminal mixed DC turnaround of unit valve
Group extractor, including：
Valve group exit instruction sending module is overhauled, for sending exit instruction to maintenance valve group, so that the service valve
Group is out of service；
Step-down instruction sending module, when for detecting the maintenance valve group for conventional valve group, to the conventional valve group
The soft straight valve group of the constant DC voltage control of same pole sends step-down instruction, so that the soft straight valve of the constant DC voltage control
Group reduces the DC voltage of the pole to preset threshold；
First exit instruction sending module, for detecting that the maintenance valve group is the soft straight of the constant DC voltage control
When valve group, finger is exited in the conventional valve group transmission to pole symmetrical and same with the soft straight valve group of the constant DC voltage control
It enables, so that the routine valve group is out of service；
Second exit instruction sending module, for detecting that the maintenance valve group is to determine the soft straight valve group of dc power control
When, it sends and drops to the soft straight valve group with the constant DC voltage control for determining the soft straight same pole of valve group that dc power controls
Pressure instruction, so that the soft straight valve group of the constant DC voltage control reduces the DC voltage of the pole to preset threshold, together
Determine described in Shi Xiangyu dc power control soft straight valve group is symmetrical and the conventional valve group of same pole sends exit instruction so that
It is out of service to obtain the conventional valve group.
As an improvement of the above scheme, the preset threshold is 50 percent.
As an improvement of the above scheme, further include：
Current regulating module, the electric current of the conventional valve group for adjusting constant DC current control described in sending end；
Power conditioning module, for adjusting the power for determining the soft straight valve group of dc power control described in receiving end.
As an improvement of the above scheme, further include：
Data obtaining module, for obtaining service valve group information；
Pole obtain module, for obtain it is described maintenance valve group described in pole.
Compared with prior art, control extra-high voltage multiterminal mixed DC turnaround of unit valve group provided in an embodiment of the present invention is moved back
Method and device has the advantages that out：
Exit instruction is sent to maintenance valve group, so that the maintenance valve group is out of service；Detect the maintenance valve group
When for conventional valve group, step-down instruction is sent to the soft straight valve group of the constant DC voltage control with the same pole of the conventional valve group, with
So that the soft straight valve group of the constant DC voltage control reduces the DC voltage of the pole to preset threshold；Detect the inspection
When repairing the soft straight valve group that valve group is the constant DC voltage control, it is symmetrical to the soft straight valve group with the constant DC voltage control and
The conventional valve group of same pole sends exit instruction, so that the routine valve group is out of service, and described determines dc power
The soft straight valve group of control continues to run.Detect that the maintenance valve group is Xiang Yusuo when determining the soft straight valve group of dc power control
The soft straight valve group for stating the constant DC voltage control for determining the soft straight same pole of valve group of dc power control sends step-down instruction, with
So that the soft straight valve group of the constant DC voltage control reduces the DC voltage of the pole to preset threshold, at the same to it is described
Determine dc power control soft straight valve group is symmetrical and the conventional valve group of same pole sends exit instruction so that the routine
Valve group is out of service, and the soft straight valve group of the constant DC voltage control continues to run.It is described when the conventional valve group exits
The pole DC voltage is dropped to preset threshold by the soft straight valve group of constant DC voltage control, avoids the constant DC voltage control
Soft straight valve group and the soft straight valve group for determining dc power control exit.When the soft straight valve group of the constant DC voltage control is moved back
When out, the conventional valve group is symmetrically exited, exiting for the soft straight valve group for determining dc power control is avoided.When described
The soft straight valve group of dc power control is determined when exiting, and the soft straight valve group of the constant DC voltage control drops to the pole DC voltage
Preset threshold symmetrically exits the conventional valve group, avoids exiting for the soft straight valve group of the constant DC voltage control.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of MMC full-bridge submodule；
Fig. 2 is control extra-high voltage multiterminal mixed DC system structure diagram provided by the invention；
Fig. 3 is the method flow signal that control extra-high voltage multiterminal mixed DC turnaround of unit valve group provided by the invention exits
Figure；
Fig. 4 is the apparatus structure signal that control extra-high voltage multiterminal mixed DC turnaround of unit valve group provided by the invention exits
Figure.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment one
Referring to fig. 2, Fig. 2 is three end mixed DC system structure diagram of extra-high voltage provided by the invention.
It should be noted that in embodiments of the present invention, being carried out by taking three end mixed DC system model of extra-high voltage as an example
It introduces, but this is not offered as control extra-high voltage multiterminal mixed DC turnaround of unit valve group provided by the present invention and exits only to fit
For three end mixed DC system of extra-high voltage, those skilled in the art have the ability under the enlightenment of method provided by the present invention
This method is mixed by deformation application appropriate in other extra-high voltage multiterminal there are technical problem involved in background technique
It closes in direct current system.
In embodiments of the present invention, the three end mixed DC system of extra-high voltage is to realize extra-high voltage grade (± 800kV)
Transmission voltage, extra-high voltage multiterminal mixed DC needs using the concatenated structure of high-low pressure valve group.Unlike customary DC,
Based on the MMC for having fault clearance ability submodule, DC voltage can be flexibly controlled, is exited in the single valve group of other termination
When, the balance of DC voltage can be realized, relevant soft straight valve group can not by the DC voltage of the reduction soft straight valve group of local terminal
It is out of service.
It is the method that control extra-high voltage multiterminal mixed DC turnaround of unit valve group provided by the invention exits referring to Fig. 3, Fig. 3
Flow diagram.
S11, exit instruction is sent to maintenance valve group, so that the maintenance valve group is out of service；
S12, when detecting the maintenance valve group for conventional valve group, DC voltage is determined to the same pole of the conventional valve group
The soft straight valve group of control sends step-down instruction, so that the soft straight valve group reduces the DC voltage of the pole to default threshold
Value；
S13, detect it is described maintenance valve group be the constant DC voltage control soft straight valve group when, determine direct current to described
The conventional valve group of the voltage-controlled soft straight same pole of valve group sends exit instruction, so that the routine valve group exits fortune
Row；
S14, detect that the maintenance valve group is when determining the soft straight valve group of dc power control, to determine dc power to described
The soft straight valve group of the constant DC voltage control of the soft straight same pole of valve group of control sends step-down instruction, so that described fixed straight
It flows voltage-controlled soft straight valve group and reduces the DC voltage of the pole and determine dc power control to preset threshold, while to described
The conventional valve group of the soft straight same pole of valve group of system sends exit instruction, so that the routine valve group is out of service.
When the soft straight valve group of the constant DC voltage control in step s 13 is out of service, the constant DC voltage control
Soft straight valve group can be high-end valve group or low side valve group, to the institute of the soft straight same pole of valve group with the constant DC voltage control
It states conventional valve group and sends exit instruction, so that the routine valve group is out of service, remaining valve group automatically controls DC voltage
It is 50%.Determine described in step S14 dc power control soft straight valve group it is out of service when, it is described determine dc power control it is soft
Straight valve group can be high-end valve group or low side valve group, and the soft straight valve group for needing to determine the voltage-controlled system of direct current electric to the pole other end is sent
Control instruction, control DC voltage reduce by 50%, at the same to the soft straight same pole of valve group for determine dc power control
The routine valve group sends exit instruction, so that the routine valve group is out of service.
As an improvement of the above scheme, the preset threshold is 50 percent.
As an improvement of the above scheme, the conventional valve group includes high-end valve group and low side valve group；
The soft straight valve group of the constant DC voltage control includes high-end valve group and low side valve group；
The soft straight valve group for determining dc power control includes high-end valve group and low side valve group.
As an improvement of the above scheme, the conventional valve group is the conventional valve group of constant DC current control.
As an improvement of the above scheme, further include：
Adjust the electric current of the conventional valve group of constant DC current control described in sending end；
Adjust the power that the soft straight valve group of dc power control is determined described in receiving end.
As an improvement of the above scheme, exit instruction is sent to maintenance valve group described, so that the maintenance valve group is moved back
Further include before operating value out：
Obtain service valve group information；
Obtain it is described maintenance valve group described in pole.
In embodiments of the present invention, when some valve group carries out overhauling out of service, the extra-high voltage multiterminal mixing
Direct current system sends exit instruction to the valve group, so that the maintenance valve group is out of service, it is mixed in the extra-high voltage multiterminal
When conjunction direct current system sends exit instruction to the valve group, the extra-high voltage multiterminal mixed DC system just has determined that maintenance
Pole where valve group information and the maintenance valve group is sending exit instruction to maintenance valve group to described, so that the inspection
Repair valve group it is out of service before further include：Service valve group information is obtained, which valve group is the maintenance valve group including exiting be, and obtains
The pole where the maintenance valve group is taken, is anode or cathode.When detecting the maintenance valve group for conventional valve group, to it is described
The soft straight valve group of the constant DC voltage control of the conventional same pole of valve group sends step-down instruction, so that the soft straight valve group reduces institute
The DC voltage of pole is stated to preset threshold, avoid the symmetrical constant DC voltage control of the conventional valve group soft straight valve group and
Determine exiting for the soft straight valve group of dc power control；Detect that the maintenance valve group is the soft straight valve of the constant DC voltage control
When group, exit instruction is sent to the conventional valve group of the soft straight same pole of valve group with the constant DC voltage control, so that
The routine valve group is out of service, avoids and symmetrically determines dc power control with the soft straight valve group of the constant DC voltage control
Soft straight valve group exit；Detect that the maintenance valve group is when determining the soft straight valve group of dc power control, to determine directly to described
The soft straight valve group for flowing the constant DC voltage control of the soft straight same pole of valve group of power control sends step-down instruction, so that institute
The soft straight valve group for stating constant DC voltage control reduces the DC voltage of the pole and determines direct current to preset threshold, while to described
The conventional valve group of the soft straight same pole of valve group of power control sends exit instruction, so that the routine valve group exits fortune
Row is avoided and is exited with the soft straight valve group for determine the soft straight symmetrical constant DC voltage control of valve group that dc power controls.
The stable operation of system can be maintained under single valve group situation out of service, reduce the out of service of soft straight valve group, dropped
Low soft straight valve group throws the frequency moved back, and is conducive to extend the service life of soft straight valve group.
Specifically, referring to fig. 2, the three end Hybrid HVDC system of extra-high voltage is using symmetrical bipolar and height end valve group
Concatenated structure, sending end converter station use customary DC converter valve, indicate the customary DC converter valve with LCC, using surely straight
Current control mode is flowed, two receiving end converter stations are all made of based on the modularization multi-level converter for having fault clearance ability,
It is indicated with MMC, wherein MMC11~MMC14 determines direct current function using dc power control mode, i.e. MMC11~MMC14 is determined to be described
The soft straight valve group of rate control, MMC21~MMC24 use constant DC voltage control mode, i.e. MMC21~MMC24 is described fixed straight
Flow voltage-controlled soft straight valve group.
It is described when detecting the maintenance valve group for conventional valve group, DC voltage is determined to the same pole of the conventional valve group
The soft straight valve group of control sends step-down instruction, so that the soft straight valve group reduces the DC voltage of the pole to default threshold
Value, specifically includes：
Valve group out of service is the high-end valve group LCC1 of 1 sending end routine converter station of pole, constant DC voltage control it is soft straight
Valve group is the soft straight converter station MMC21 and MMC22 of receiving end；Then control method is specially：To the soft straight of the constant DC voltage control
The soft straight valve group MMC22 of valve group MMC21 and the constant DC voltage control sends step-down instruction, 1 DC voltage of control electrode drop
Low 50%, pole 1 continues to run after dropping 50% at a dc voltage, does not move back with the conventional symmetrical soft straight valve group of valve group LCC1
It runs out, and the method for operation of pole 2 is unaffected.In actual operation, in the premise for guaranteeing 1 DC voltage of pole decline 50%
Under, the soft straight valve group MMC21 of the adjustable constant DC voltage control and the soft straight valve group of the constant DC voltage control
The DC voltage of MMC22.In order to reduce the complexity of control, the soft straight valve group MMC21 of receiving end constant DC voltage control and institute
The DC voltage for stating MMC22 is set as reduction by 50%, and how many to DC voltage decline percent, the present invention does not make this to have
Body limits, and preferably declines 50%.In addition, the dc power that pole 1 is transmitted can be excessively negative meeting direct current system according to actual needs
Under the premise of lotus requires, determined described in receiving end by adjusting the electric current of the conventional valve group of constant DC current control described in sending end and adjusting
The power of the soft straight valve group of dc power control controls dc power, to realize the stable operation after the conventional valve group exits
When power transmission.
When the soft straight valve group for detecting the maintenance valve group as the constant DC voltage control, direct current is determined to described
Voltage-controlled soft straight valve group is symmetrical and the conventional valve group of same pole sends exit instruction, so that the routine valve group is moved back
It runs, specifically includes out：
Valve group out of service is the high-end valve group MMC21 of the soft straight converter station of 1 receiving end constant DC voltage control of pole, described fixed
The soft straight valve group of dc power control is the soft straight valve group MMC11 and MMC12 of the soft straight converter station of receiving end；Then control method is specific
For：To the routine valve group LCC1 or described of the sending end of pole symmetrical and same with the soft straight valve group of the constant DC voltage control
Conventional valve group LCC2 sends control instruction, keeps the conventional valve group LCC2 of the routine valve group LCC1 or described out of service, pole 1 is straight
It is continued to run after galvanic electricity drops 50%, the soft straight valve group MMC11 of dc power control is determined described in receiving end and described determines direct current function
The soft straight valve group MMC12 of rate control is not out of service, and the method for operation of pole 2 is unaffected.At this time in addition, pole 1 is transmitted
Dc power can be fixed described in sending end by adjusting according to actual needs, under the premise of meeting direct current system overload requirement
The power of the soft straight valve group of dc power control is determined described in the electric current and adjusting receiving end of the conventional valve group of DC current control to control
Dc power processed, to realize the power transmission when stable operation after the soft straight valve group of the constant DC voltage control exits.
It is described to detect that the maintenance valve group is when determining the soft straight valve group of dc power control, to determine dc power to described
The soft straight valve group of the constant DC voltage control of the soft straight same pole of valve group of control sends step-down instruction, so that described fixed straight
It flows voltage-controlled soft straight valve group and reduces the DC voltage of the pole and determine dc power control to preset threshold, while to described
The soft straight valve group of system is symmetrical and the conventional valve group of same pole sends exit instruction, so that the routine valve group exits fortune
Row, specifically includes：
Valve group out of service is the high-end valve group MMC11 that 1 receiving end of pole determines that dc power controls soft straight converter station, described fixed
The soft straight valve group of DC voltage control is the soft straight valve group MMC21 and MMC22 of the soft straight converter station of receiving end；Then control method is specific
For：The soft straight valve group MMC22 of soft straight valve group MMC21 and the constant DC voltage control to the constant DC voltage control are sent
Step-down instruction, 1 DC voltage of control electrode reduce by 50%, to sending end and it is described determine dc power control soft straight valve group symmetrically and
The routine valve group LCC1 or described routine valve group LCC2 of same pole sends control instruction, makes the routine valve group LCC1 or institute
It is out of service to state conventional valve group LCC2, pole 1 continues to run after dropping 50% at a dc voltage, constant DC voltage control described in receiving end
Soft straight valve group MMC21 and the constant DC voltage control soft straight valve group MMC22 it is not out of service, and the operation of pole 2
Mode is unaffected.In actual operation, adjustable described fixed straight under the premise of guaranteeing 1 DC voltage of pole decline 50%
Flow the DC voltage of the soft straight valve group MMC22 of voltage-controlled soft straight valve group MMC21 and the constant DC voltage control.In order to
The complexity for reducing control, the soft straight valve group MMC21 of constant DC voltage control described in receiving end and the constant DC voltage control
The DC voltage of soft straight valve group MMC22 is set as reduction by 50%.In addition, pole 1 transmit dc power can according to actual needs,
Under the premise of meeting direct current system overload requirement, the electricity of the conventional valve group by adjusting constant DC current control described in sending end
The power of the soft straight valve group of dc power control is determined described in stream and adjusting receiving end to control dc power, after realizing that valve group exits
Stable operation when power transmission.
It should be noted that the embodiment of the present invention is illustrated with pole 1, the valve group operating principle of pole 2 is consistent, the present invention
Therefore not to repeat here.
Implement the embodiment of the present invention to have the advantages that：
Exit instruction is sent to maintenance valve group, so that the maintenance valve group is out of service；Detect the maintenance valve group
When for conventional valve group, step-down instruction is sent to the soft straight valve group of the constant DC voltage control with the same pole of the conventional valve group, with
So that the soft straight valve group of the constant DC voltage control reduces the DC voltage of the pole to preset threshold；Detect the inspection
When repairing the soft straight valve group that valve group is the constant DC voltage control, it is symmetrical to the soft straight valve group with the constant DC voltage control and
The conventional valve group of same pole sends exit instruction, so that the routine valve group is out of service, it is described to determine dc power control
The soft straight valve group of system continues to run；Detect it is described maintenance valve group be determine dc power control soft straight valve group when, to it is described
The soft straight valve group for determining the constant DC voltage control of the soft straight same pole of valve group of dc power control sends step-down instruction, so that
The soft straight valve group of the constant DC voltage control reduces the DC voltage of the pole to preset threshold, while to it is described fixed
The soft straight valve group of dc power control is symmetrical and the conventional valve group of same pole sends exit instruction, so that the conventional valve
Group is out of service, and the soft straight valve group for determining DC voltage continues to run.It is described to determine direct current when the conventional valve group exits
The pole DC voltage is dropped to preset threshold by the soft straight valve group of voltage-controlled system, is avoided and described is determined the soft straight valve group of DC voltage and fixed straight
The stream soft straight valve group of power exits.When the soft straight valve group of the constant DC voltage control exits, only symmetrically exit described in one
The soft straight valve group of conventional valve group, the single constant DC voltage control exits, and avoids and described determine the soft straight valve of dc power
Group exits.When the soft straight valve group for determining dc power control exits, the soft straight valve group of the constant DC voltage control will
The pole DC voltage drops to preset threshold, only symmetrically exits the conventional valve group, individually described to determine what dc power controlled
Soft straight valve group exits, and the soft straight valve group for avoiding the constant DC voltage control exits.
Embodiment two
Referring to fig. 4, control extra-high voltage multiterminal mixed DC turnaround of unit valve group extractor structure provided by the invention is shown
It is intended to.
A kind of control extra-high voltage multiterminal mixed DC turnaround of unit valve group extractor, which is characterized in that included：
Valve group exit instruction sending module 31 is overhauled, for sending exit instruction to maintenance valve group, so that the maintenance
Valve group is out of service；
Step-down instruction sending module 32, when for detecting the maintenance valve group for conventional valve group, to the conventional valve
The soft straight valve group of the constant DC voltage control of the same pole of group sends step-down instruction, so that the soft straight valve group reduces the pole
DC voltage is to preset threshold；
First exit instruction sending module 33, for detecting that the maintenance valve group is the soft of the constant DC voltage control
When straight valve group, finger is exited in the conventional valve group transmission to pole symmetrical and same with the soft straight valve group of the constant DC voltage control
It enables, so that the routine valve group is out of service；
Second exit instruction sending module 34, for detecting that the maintenance valve group is to determine the soft straight valve of dc power control
When group, sent to the soft straight valve group with the constant DC voltage control for determining the soft straight same pole of valve group that dc power controls
Step-down instruction, so that the soft straight valve group of the constant DC voltage control reduces the DC voltage of the pole to preset threshold,
Exit instruction is sent to the conventional valve group of pole symmetrical and same with the soft straight valve group for determining dc power control simultaneously, with
So that the routine valve group is out of service.
Preferably, the preset threshold is 50 percent.
Preferably, further include：
Current regulating module, the electric current of the conventional valve group for adjusting constant DC current control described in sending end；
Power conditioning module, for adjusting the power for determining the soft straight valve group of dc power control described in receiving end.
Preferably, further include：
Data obtaining module, for obtaining service valve group information；
Pole obtain module, for obtain it is described maintenance valve group described in pole.
Preferably, the conventional valve group includes high-end valve group and low side valve group；
The soft straight valve group of the constant DC voltage control includes high-end valve group and low side valve group；
The soft straight valve group for determining dc power control includes high-end valve group and low side valve group.
Preferably, the conventional valve group is the conventional valve group of constant DC current control.
Implement the present embodiment to have the advantages that：
Exit instruction is sent to maintenance valve group, so that the maintenance valve group is out of service；Detect the maintenance valve group
When for conventional valve group, step-down instruction is sent to the soft straight valve group of the constant DC voltage control with the same pole of the conventional valve group, with
So that the soft straight valve group reduces the DC voltage of the pole to preset threshold；Detect that the maintenance valve group is described fixed straight
When flowing voltage-controlled soft straight valve group, to the routine of pole symmetrical and same with the soft straight valve group of the constant DC voltage control
Valve group sends exit instruction, so that the routine valve group is out of service；Detect that the maintenance valve group is to determine dc power control
When the soft straight valve group of system, to the soft of the constant DC voltage control with the soft straight same pole of valve group for determining dc power control
Straight valve group sends step-down instruction, so that the DC voltage that the soft straight valve group of the constant DC voltage control reduces the pole arrives
Preset threshold, while being moved back to the conventional valve group transmission of pole symmetrical and same with the soft straight valve group for determining dc power control
It instructs out, so that the routine valve group is out of service.When the conventional valve group exits, the constant DC voltage control it is soft
The pole DC voltage is dropped to preset threshold by straight valve group, is avoided and described determined the soft straight valve group of DC voltage and described determine dc power
Soft straight valve group exits.When the soft straight valve group of the constant DC voltage control exits, the conventional valve group is symmetrically exited,
Avoid exiting for the soft straight valve group for determining dc power control.When the soft straight valve group for determining dc power control exits
When, which is dropped to preset threshold by the soft straight valve group of the constant DC voltage control, symmetrically exit one it is described often
Valve group is advised, exiting for the soft straight valve group of the constant DC voltage control is avoided.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (10)
1. a kind of control extra-high voltage multiterminal mixed DC turnaround of unit valve group exits method, which is characterized in that including：
Exit instruction is sent to maintenance valve group, so that the maintenance valve group is out of service；
When detecting that the maintenance valve group is conventional valve group, to the soft of the constant DC voltage control with the same pole of the conventional valve group
Straight valve group sends step-down instruction, so that the DC voltage that the soft straight valve group of the constant DC voltage control reduces the pole arrives
Preset threshold；
Detect it is described maintenance valve group be the constant DC voltage control soft straight valve group when, to the constant DC voltage control
Soft straight valve group is symmetrical and the conventional valve group of same pole sends exit instruction so that the routine valve group is out of service；
Detect that the maintenance valve group is to determine the soft of dc power control to described when determining the soft straight valve group of dc power control
The soft straight valve group of the constant DC voltage control of the straight same pole of valve group sends step-down instruction, so that described, to determine direct current voltage-controlled
The soft straight valve group of system reduces the DC voltage of the pole to preset threshold, while determining the soft straight of dc power control to described
Valve group is symmetrical and the conventional valve group of same pole sends exit instruction, so that the routine valve group is out of service.
2. control extra-high voltage multiterminal mixed DC turnaround of unit valve group exits method as described in claim 1, which is characterized in that
The preset threshold is 50 percent.
3. control extra-high voltage multiterminal mixed DC turnaround of unit valve group exits method as described in claim 1, which is characterized in that
The routine valve group includes high-end valve group and low side valve group；
The soft straight valve group of the constant DC voltage control includes high-end valve group and low side valve group；
The soft straight valve group for determining dc power control includes high-end valve group and low side valve group.
4. control extra-high voltage multiterminal mixed DC turnaround of unit valve group exits method as described in claim 1, which is characterized in that
The routine valve group is the conventional valve group of constant DC current control.
5. control extra-high voltage multiterminal mixed DC turnaround of unit valve group exits method as described in claim 1, which is characterized in that
Further include：
Adjust the electric current of the conventional valve group of constant DC current control described in sending end；
Adjust the power that the soft straight valve group of dc power control is determined described in receiving end.
6. control extra-high voltage multiterminal mixed DC turnaround of unit valve group extractor as described in claim 1, which is characterized in that
Exit instruction is sent to maintenance valve group described, so that further including before maintenance valve group value out of service：
Obtain service valve group information；
Obtain it is described maintenance valve group described in pole.
7. a kind of control extra-high voltage multiterminal mixed DC turnaround of unit valve group extractor, which is characterized in that included：
Valve group exit instruction sending module is overhauled, for sending exit instruction to maintenance valve group, so that the maintenance valve group is moved back
It runs out；
Step-down instruction sending module, when for detecting the maintenance valve group for conventional valve group, to same with the conventional valve group
The soft straight valve group of the constant DC voltage control of pole sends step-down instruction, so that the soft straight valve group drop of the constant DC voltage control
The DC voltage of the low pole is to preset threshold；
First exit instruction sending module, for detecting that the maintenance valve group is the soft straight valve group of the constant DC voltage control
When, exit instruction is sent to the conventional valve group of pole symmetrical and same with the soft straight valve group of the constant DC voltage control, with
So that the routine valve group is out of service；
Second exit instruction sending module, for detect it is described maintenance valve group be determine dc power control soft straight valve group when,
It sends and is depressured to the soft straight valve group with the constant DC voltage control for determining the soft straight same pole of valve group that dc power controls
Instruction, so that the soft straight valve group of the constant DC voltage control reduces the DC voltage of the pole to preset threshold, simultaneously
Exit instruction is sent to the conventional valve group of pole symmetrical and same with the soft straight valve group for determining dc power control, so that
The routine valve group is out of service.
8. control extra-high voltage multiterminal mixed DC turnaround of unit valve group extractor as claimed in claim 7, which is characterized in that
The preset threshold is 50 percent.
9. control extra-high voltage multiterminal mixed DC turnaround of unit valve group extractor as claimed in claim 7, which is characterized in that
Further include：
Current regulating module, the electric current of the conventional valve group for adjusting constant DC current control described in sending end；
Power conditioning module, for adjusting the power for determining the soft straight valve group of dc power control described in receiving end.
10. control extra-high voltage multiterminal mixed DC turnaround of unit valve group extractor, feature exist as claimed in claim 7
In further including：
Data obtaining module, for obtaining service valve group information；
Pole obtain module, for obtain it is described maintenance valve group described in pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810815323.4A CN108923451B (en) | 2018-07-23 | 2018-07-23 | Method and device for controlling extra-high voltage multi-end hybrid direct current device to overhaul valve bank to exit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810815323.4A CN108923451B (en) | 2018-07-23 | 2018-07-23 | Method and device for controlling extra-high voltage multi-end hybrid direct current device to overhaul valve bank to exit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108923451A true CN108923451A (en) | 2018-11-30 |
| CN108923451B CN108923451B (en) | 2020-12-18 |
Family
ID=64416980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810815323.4A Active CN108923451B (en) | 2018-07-23 | 2018-07-23 | Method and device for controlling extra-high voltage multi-end hybrid direct current device to overhaul valve bank to exit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108923451B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113765121A (en) * | 2021-07-28 | 2021-12-07 | 中国电力科学研究院有限公司 | Recovery method and system after commutation failure of VSC/LCC parallel hybrid multi-feed system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014094131A1 (en) * | 2012-12-21 | 2014-06-26 | Woodford Dennis A | Multilevel valve for voltage sourced converter transmission |
| CN104600737A (en) * | 2015-01-21 | 2015-05-06 | 南京南瑞继保电气有限公司 | Implementation method and control device of selective blocking and deblocking of extra high voltage direct current transmission valve groups |
| CN106487033A (en) * | 2016-12-15 | 2017-03-08 | 南方电网科学研究院有限责任公司 | Conversion method and system for converting full voltage into half voltage operation in hybrid direct current transmission system |
| CN106655126A (en) * | 2017-01-20 | 2017-05-10 | 南方电网科学研究院有限责任公司 | Single valve group exiting method in flexible direct current system |
| CN106712073A (en) * | 2017-02-28 | 2017-05-24 | 南方电网科学研究院有限责任公司 | Operation conversion method for extra-high voltage hybrid direct-current transmission system |
| CN108092295A (en) * | 2016-11-21 | 2018-05-29 | 南方电网科学研究院有限责任公司 | Online input method for single valve bank in hybrid direct-current system |
| CN108258657A (en) * | 2018-03-05 | 2018-07-06 | 南京南瑞继保电气有限公司 | A kind of voltage source converter protection circuit and guard method and device |
-
2018
- 2018-07-23 CN CN201810815323.4A patent/CN108923451B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014094131A1 (en) * | 2012-12-21 | 2014-06-26 | Woodford Dennis A | Multilevel valve for voltage sourced converter transmission |
| CN104600737A (en) * | 2015-01-21 | 2015-05-06 | 南京南瑞继保电气有限公司 | Implementation method and control device of selective blocking and deblocking of extra high voltage direct current transmission valve groups |
| CN108092295A (en) * | 2016-11-21 | 2018-05-29 | 南方电网科学研究院有限责任公司 | Online input method for single valve bank in hybrid direct-current system |
| CN106487033A (en) * | 2016-12-15 | 2017-03-08 | 南方电网科学研究院有限责任公司 | Conversion method and system for converting full voltage into half voltage operation in hybrid direct current transmission system |
| CN106655126A (en) * | 2017-01-20 | 2017-05-10 | 南方电网科学研究院有限责任公司 | Single valve group exiting method in flexible direct current system |
| CN106712073A (en) * | 2017-02-28 | 2017-05-24 | 南方电网科学研究院有限责任公司 | Operation conversion method for extra-high voltage hybrid direct-current transmission system |
| CN108258657A (en) * | 2018-03-05 | 2018-07-06 | 南京南瑞继保电气有限公司 | A kind of voltage source converter protection circuit and guard method and device |
Non-Patent Citations (1)
| Title |
|---|
| 黄伟煌等: "特高压多端混合直流输电***稳定控制策略", 《南方电网技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113765121A (en) * | 2021-07-28 | 2021-12-07 | 中国电力科学研究院有限公司 | Recovery method and system after commutation failure of VSC/LCC parallel hybrid multi-feed system |
| CN113765121B (en) * | 2021-07-28 | 2023-09-01 | 中国电力科学研究院有限公司 | VSC/LCC parallel hybrid multi-feed system commutation failure recovery method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108923451B (en) | 2020-12-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207559578U (en) | Hybrid direct-current power transmission system and fault ride-through system with hybrid MMC (modular multilevel converter) layered access | |
| CN104795834B (en) | A kind of Hybrid HVDC topological structure and control method | |
| EP2589127B1 (en) | A multi-terminal dc transmission system and method and means for control thereof | |
| CN107769241B (en) | Voltage and current control method and device for direct current transmission system | |
| CN104852401A (en) | Hybrid direct-current transmission system, control method and power reversal control method | |
| CN103269083B (en) | Multi-terminal high-voltage direct-current power transmission system | |
| CN108988373A (en) | A kind of method and system for being controlled Hybrid HVDC system receiving end AC fault | |
| CN108599200A (en) | Urgent limit Poewr control method of the isolated island new energy through very bipolar soft straight power grid access | |
| CN105977954B (en) | A kind of breaker mixed configuration method and device of flexible direct current power grid | |
| CN113452061B (en) | Offshore wind power direct current transmission system and control method thereof | |
| CN108418228A (en) | A kind of active power controller method when converter fault and flexible direct current power grid | |
| CN102163842A (en) | Method for switching control modes of parallel-connection type multi-terminal direct current power transmission system | |
| CN108923451A (en) | Method and device for controlling extra-high voltage multi-end hybrid direct current device to overhaul valve bank to exit | |
| CN107919809A (en) | A kind of energy accumulation current converter system and its control method | |
| CN110323774A (en) | A kind of DC line fault method for restarting, VSC control method and device | |
| CN106329557A (en) | Control apparatus, system and method for multi-pole flexible direct current power transmission system | |
| CN109687499A (en) | A kind of voltage balancing control method of flexible direct current converter station series connection converter valve | |
| CN109298255A (en) | A kind of subway energy feedback current transformer power examination test system and method | |
| CN109995012A (en) | Direct-flow distribution system and its control method | |
| CN106911131A (en) | A kind of em ergency power support control method of AC network subregion interconnect device | |
| CN106684901B (en) | A kind of combination converter Control method and system powered to passive system | |
| CN108808716A (en) | A kind of extra-high voltage Hybrid HVDC system load flow inverts control method online | |
| CN101242139A (en) | Power modulation method for operation/exit of ultra-high DC single 12-pulse conversion unit | |
| CN108964111A (en) | Direct-current power transmission system with medium-voltage side direct-current outgoing line and control method thereof | |
| CN111614114B (en) | Voltage control method of parallel hybrid multi-terminal direct current transmission system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |