CN109510179A - Split-phase damps the direct current cut-off device and method of MMC and AC circuit breaker cooperation - Google Patents
Split-phase damps the direct current cut-off device and method of MMC and AC circuit breaker cooperation Download PDFInfo
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- CN109510179A CN109510179A CN201811323829.XA CN201811323829A CN109510179A CN 109510179 A CN109510179 A CN 109510179A CN 201811323829 A CN201811323829 A CN 201811323829A CN 109510179 A CN109510179 A CN 109510179A
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- circuit breaker
- damping
- direct current
- split
- phase
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
-
- 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]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention relates to the direct current cut-off devices and method of a kind of split-phase damping throw-in type MMC topology and AC circuit breaker cooperation, belong to flexible DC transmission technology field.The present invention provides with a kind of direct current cut-off device and strategy based on split-phase damping throw-in type MMC topology and AC circuit breaker cooperation.After sensor detects that failure occurs on route, converter station startup separator control program, three-phase bridge arm submodule is all made of bypass strategy, while each bridge arm asymmetry puts into itself damping module.After control strategy starting, it is superimposed an AC compounent on DC bus, detects that zero crossing, AC circuit breaker are begun breaking to AC circuit breaker, after AC circuit breaker is fully disconnected, pulls open disconnecting switch.The present invention can effectively cut off the Quick-return after DC line fault and failure.Compared to dc circuit breaker scheme, the use of AC circuit breaker can substantially reduce cutout cost, and the present invention can also effectively be suitable for DC grid scene.
Description
Technical field
The present invention relates to the direct current cut-off devices and side of a kind of split-phase damping throw-in type MMC topology and AC circuit breaker cooperation
Method belongs to flexible direct-current transmission field.
Background technique
Flexible multi-terminal direct current transmission system and DC grid technology interconnect renewable energy and traditional energy wide area, can be with
It sufficiently realizes various energy resources form, large space span, Multiple Time Scales, the complementation between multiuser types, is the following power grid
Important development direction.Multi-terminal direct current transmission system and DC grid technology have many advantages, such as.Mainly it is made of power electronic equipment
Flexible direct current power grid compare conventional AC system, be the system of one " low inertia ", responsive time constant compares AC network
To when young 2 quantitative levels.After serious direct-current short circuit failure occurs for DC grid, the submodule capacitor in inverter will be fast
Speed electric discharge, causes DC current to rise rapidly.If faulty line be not isolated, power electronic devices damage will cause,
Lead to DC grid system shutdown, the stability of harm system operation.DC grid protection system needs to have high response
Speed.
At present after DC Line Fault occurs, the main method of DC grid isolated fault route is pacified at DC line both ends
It fills high voltage DC breaker (DC circuit breaker, DCCB).Pass through reasonable fault detection method, tripping fault wire
The dc circuit breaker of road two sides can fast and effeciently isolated fault route.But multi-terminal direct current transmission system and DC grid event
Barrier influences seriously, and the high voltage DC breaker development suitable for multi-terminal direct current transmission system and DC grid engineer application is difficult and makes
High price is expensive.Therefore, the DC Line Fault of multi-terminal direct current transmission system and DC grid cutting is a problem to be solved.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of split-phase damping throw-in type MMC topology and friendships
Flow the direct current cut-off device and method of breaker cooperation.
It is an object of the invention to solve the DC Line Fault suitable for multi-terminal direct current transmission system and DC grid engineer application
Route cuts off problem.
In order to achieve the above-mentioned object of the invention, the technical solution adopted in the present invention is as follows:
On the one hand, the present invention provides the direct current cut-off method of a kind of split-phase damping throw-in type MMC topology and AC circuit breaker cooperation,
Include:
The voltage Vdci and current value Idci of route i where sensor real-time monitoring on route i, and to place line relay
I real-time transmission data Vdci and Idci.
When converter station operates normally, relay exports normal operation signal: Tfi=0 to sequence controller；Failure occurs
Afterwards, each line relay is based on voltage and current Data Detection failure and identifies fault type, and faulty line i relay is to timing control
Device processed exports Fault Control enabling signal Tfi=1.
When sequence controller receives signal are as follows: when Tfi=0, converter station is worked normally.When sequence controller receives signal
Are as follows: when Tfi=1, converter station works normally startup separator control program, and three-phase bridge arm submodule is all made of bypass strategy, simultaneously
Each bridge arm puts into itself damping module, and inverter starts to export AC compounent on DC bus at this time.
When AC circuit breaker detects that current zero-crossing point, AC circuit breaker start to act.It is fully disconnected to AC circuit breaker
Afterwards, disconnecting switch is pulled open.Faulty line is cut off.
Failover procedure are as follows: after route disconnects, remove fault point.Close circuit breaker simultaneously carries out converter station starting.
The present invention can effectively cut off DC line fault, and realize the Quick-return after failure.
On the other hand, the present invention provides a kind of split-phase damping throw-in type MMC topology and the direct current of AC circuit breaker cooperation is disconnected
Flow device, comprising:
MMC converter station: mentioned MMC converter station is that split-phase damps throw-in type MMC topology, including: the normal half-bridge MMC change of current
It stands, damp investment module.MMC converter station undertakes rectification, inversion function when normal operation.After failure occurs, sequence controller is received
To signal are as follows: when Tfi=1, converter station works normally startup separator control program, and three-phase bridge arm submodule is all made of bypass plan
Slightly, while each bridge arm puts into itself damping module, and inverter starts to export AC compounent on DC bus at this time.When exchange is disconnected
Road device detects that current zero-crossing point, AC circuit breaker start to act.After AC circuit breaker is fully disconnected, disconnecting switch is pulled open.
Faulty line is cut off.
AC circuit breaker: mentioned AC circuit breaker is regular alternating current breaker, when AC circuit breaker detects current over-zero
Point, AC circuit breaker start to act.After AC circuit breaker is fully disconnected, disconnecting switch is pulled open.Faulty line is cut off.
Sensor, relay: the voltage and current of route where being able to detect, and export the signal of this unit
Sequence controller: the core controller of this programme, the signal transmitted according to line sensor and AC circuit breaker transmit
Signal, set the Fault Control mode of inverter.When sequence controller receives signal are as follows: when Tfi=0, the normal work of converter station
Make.When sequence controller receives signal are as follows: when Tfi=1, converter station works normally startup separator control program, three-phase bridge arm
Module is all made of bypass strategy, while each bridge arm puts into itself damping module, and inverter starts to export on DC bus at this time
AC compounent.When AC circuit breaker detects that current zero-crossing point, AC circuit breaker start to act.It is fully disconnected to AC circuit breaker
Afterwards, disconnecting switch is pulled open.Faulty line is cut off.
Detailed description of the invention
Fig. 1 is that split-phase damps throw-in type MMC topology in the embodiment of the present invention
Fig. 2 is logic control block diagram in the embodiment of the present invention
Fig. 3 is that Neutron module of the embodiment of the present invention bypasses schematic diagram
Fig. 4 is direct current cutout process flow diagram flow chart in the embodiment of the present invention
Fig. 5 is faulty line current waveform after control strategy investment after detecting DC side failure in the embodiment of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
The embodiment of the invention provides the direct current cutout of a kind of split-phase damping throw-in type MMC topology and AC circuit breaker cooperation
Device and method, split-phase damp throw-in type MMC topology as shown in Figure 1:
Mentioned MMC converter station is that split-phase damps throw-in type MMC topology, is increased on six bridge arm of three-phase of normal half-bridge MMC converter station
Add damping investment module.
The embodiment of the invention provides the direct current cutout of a kind of split-phase damping throw-in type MMC topology and AC circuit breaker cooperation
Method, cutting-off process specific flow chart is as shown in Fig. 2, detailed process is as follows:
The voltage Vdci and current value Idci of route i where sensor real-time monitoring on route i, and to place route i relay
Device real-time transmission data Vdci and Idci.
When converter station operates normally, relay exports normal operation signal: Tfi=0 to sequence controller；Failure occurs
Afterwards, each line relay is based on voltage and current Data Detection failure, and faulty line i relay exports failure control to sequence controller
Enabling signal Tfi=1 processed.
When sequence controller receives signal are as follows: when Tfi=1, converter station works normally startup separator control program, three-phase bridge
Arm submodule is all made of bypass strategy, while each bridge arm puts into itself damping module, and inverter starts on DC bus at this time
Export AC compounent.
When AC circuit breaker detects that current zero-crossing point, AC circuit breaker start to act.It is fully disconnected to AC circuit breaker
Afterwards, disconnecting switch is pulled open.Faulty line is cut off.
The embodiment of the invention provides the direct current cutout of a kind of split-phase damping throw-in type MMC topology and AC circuit breaker cooperation
Method, Neutron module bypass schematic diagram as shown in figure 3, detailed process is as follows:
When sequence controller receives signal are as follows: when Tfi=1, converter station startup separator control program adopts whole half-bridge submodules
With Bypass Control strategy.At this point for whole half-bridge submodules, Trig control signal is T2=1, T1=0, and submodule is only at this time
RED sector in figure is connected.At the same time, the damping switching module asymmetry investment of each bridge arm, so that converter station is defeated to DC side
Waves AC out.
The embodiment of the invention provides the direct current cutout of a kind of split-phase damping throw-in type MMC topology and AC circuit breaker cooperation
Method, wherein direct current stops process flow diagram flow chart as shown in figure 4, detailed process is as follows:
When converter station operates normally, relay exports normal operation signal: Tfi=0 to sequence controller；After failure occurs, respectively
Line relay is based on voltage and current Data Detection failure, and faulty line i relay is opened to sequence controller output Fault Control
Dynamic signal Tfi=1.
When sequence controller receives signal are as follows: when Tfi=1, converter station works normally startup separator control program, three-phase bridge
Arm submodule is all made of bypass strategy, while each bridge arm puts into itself damping module, and inverter starts on DC bus at this time
Export AC compounent.
When AC circuit breaker detects that current zero-crossing point, AC circuit breaker start to act.It is fully disconnected to AC circuit breaker
Afterwards, disconnecting switch is pulled open.Faulty line is cut off, and converter station is restarted until operating normally.
The embodiment of the invention provides the direct current cutout of a kind of split-phase damping throw-in type MMC topology and AC circuit breaker cooperation
Method, wherein investment Fault Control strategy after faulty line current waveform as shown in figure 5, failure strategy investment after faulty line
Upper generation AC compounent, AC circuit breaker detect zero crossing and cut off DC Line Fault.
For convenience of description, each section of apparatus described above is divided into various modules with function or unit describes respectively.
Certainly, each module or the function of unit can be realized in same or multiple softwares or hardware when implementing the application.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute
The those of ordinary skill in category field can still modify to a specific embodiment of the invention referring to above-described embodiment or
Equivalent replacement, these are applying for this pending hair without departing from any modification of spirit and scope of the invention or equivalent replacement
Within bright claims.
Claims (8)
1. a kind of direct current cut-off method of split-phase damping throw-in type MMC topology and AC circuit breaker cooperation, which is characterized in that packet
It includes:
Sensor and AC circuit breaker real-time monitoring line status amount on route, and believe in real time to sequence controller transmission state
Number；
After failure occurs, each line relay is based on voltage and current Data Detection failure and identifies fault type, and to timing control
Device processed exports Fault Control enabling signal；
Converter station startup separator control program, three-phase bridge arm submodule is all made of bypass strategy, while each bridge arm puts into itself resistance
Buddhist nun's module；
After the starting of Fault Control strategy, inverter starts to export AC compounent on the line to direct current；
Detect that zero crossing, AC circuit breaker are begun breaking to the AC circuit breaker on DC bus, it is complete to AC circuit breaker
Disconnecting switch disconnects after disconnection.
2. the direct current cut-off method of split-phase damping throw-in type MMC topology and AC circuit breaker cooperation according to claim 1,
It is characterized in that, sensor and AC circuit breaker real-time monitoring line status amount on route, and passed in real time to sequence controller
Defeated status signal.
3. the direct current cut-off method of split-phase damping throw-in type MMC topology and AC circuit breaker cooperation according to claim 1,
It is characterized in that, each line relay is based on voltage and current Data Detection failure and identifies fault type after failure occurs, and to
Sequence controller exports Fault Control enabling signal.
4. the direct current cut-off method of split-phase damping throw-in type MMC topology and AC circuit breaker cooperation according to claim 1,
It is characterized in that, converter station startup separator control program, comprising:
Three-phase bridge arm submodule is all made of bypass strategy, while each bridge arm puts into itself damping module；
After the starting of Fault Control strategy, inverter starts to export AC compounent on the line to direct current.
5. the direct current cut-off method of split-phase damping throw-in type MMC topology and AC circuit breaker cooperation according to claim 1,
It is characterized in that, detecting that zero crossing, AC circuit breaker are begun breaking to the AC circuit breaker on DC bus, to alternating current interruption
Device is fully disconnected rear disconnecting switch and disconnects；
A kind of direct current cut-off device of split-phase damping throw-in type MMC topology and AC circuit breaker cooperation, which is characterized in that including dividing
Mutually damping throw-in type MMC topology, AC circuit breaker, line sensor, relay, sequence controller Collaborative Control device.
6. the direct current cut-off device of split-phase damping throw-in type MMC topology and AC circuit breaker cooperation according to claim 6,
It is characterized in that, MMC converter station is the half-bridge submodule MMC topology comprising damping investment module, comprising: normal half-bridge MMC is changed
Stream station, damping investment module；
MMC converter station undertakes rectification, inversion function when normal operation, and damping investment module is not put into；After failure occurs, work as timing
Controller receives signal combination are as follows: when Tfi=1, converter station startup separator control program, three-phase bridge arm submodule is all made of bypass
Strategy, while each bridge arm puts into itself damping module, inverter starts to export AC compounent on DC bus at this time；
When AC circuit breaker detects that current zero-crossing point, AC circuit breaker start to act；
After AC circuit breaker is fully disconnected, disconnecting switch is pulled open；
Faulty line is cut off.
7. the direct current cut-off device of split-phase damping throw-in type MMC topology and AC circuit breaker cooperation according to claim 6,
It is characterized in that, the AC circuit breaker of detectable current zero-crossing point, comprising:
Mentioned AC circuit breaker is regular alternating current breaker, is able to detect line current zero crossing and cuts off DC Line Fault.
8. the direct current cut-off device of split-phase damping throw-in type MMC topology and AC circuit breaker cooperation according to claim 6,
It is characterized in that, sequence controller designs, comprising:
Sequence controller is core controller, the signal of the signal and AC circuit breaker that are transmitted according to line sensor transmitted,
Set the control mode of inverter；
When sequence controller receives signal are as follows: when Tfi=0, converter station is worked normally；
When sequence controller receives signal are as follows: when Tfi=1, converter station works normally startup separator control program, three-phase bridge arm
Module is all made of bypass strategy, while each bridge arm puts into itself damping module, and inverter starts to export on DC bus at this time
AC compounent；
When AC circuit breaker detects that current zero-crossing point, AC circuit breaker start to act；
After AC circuit breaker is fully disconnected, disconnecting switch is pulled open；
Faulty line is cut off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811323829.XA CN109510179A (en) | 2018-11-08 | 2018-11-08 | Split-phase damps the direct current cut-off device and method of MMC and AC circuit breaker cooperation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811323829.XA CN109510179A (en) | 2018-11-08 | 2018-11-08 | Split-phase damps the direct current cut-off device and method of MMC and AC circuit breaker cooperation |
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| CN109510179A true CN109510179A (en) | 2019-03-22 |
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| CN201811323829.XA Pending CN109510179A (en) | 2018-11-08 | 2018-11-08 | Split-phase damps the direct current cut-off device and method of MMC and AC circuit breaker cooperation |
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Cited By (2)
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| CN110719044A (en) * | 2019-09-12 | 2020-01-21 | 东南大学 | Method for positioning open-circuit fault of lower tube of submodule of modular multilevel converter |
| WO2021196563A1 (en) * | 2020-04-01 | 2021-10-07 | 浙江大学 | Resistor-type sub-module mixed-type mmc and direct-current fault processing policy therefor |
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