CN109921388A - The direct current cut-off device and method of hybrid MMC and AC circuit breaker cooperation - Google Patents
The direct current cut-off device and method of hybrid MMC and AC circuit breaker cooperation Download PDFInfo
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- CN109921388A CN109921388A CN201811323297.XA CN201811323297A CN109921388A CN 109921388 A CN109921388 A CN 109921388A CN 201811323297 A CN201811323297 A CN 201811323297A CN 109921388 A CN109921388 A CN 109921388A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- 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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Abstract
The present invention relates to the direct current cut-off devices and method of a kind of hybrid MMC topology of full-bridge-half-bridge split-phase 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 the hybrid MMC topology of full-bridge-half-bridge split-phase and AC circuit breaker cooperation.After sensor detects that failure occurs on route, converter station startup separator control program, the two-phase being made of half-bridge submodule uses Bypass Control strategy, and the phase being made of full-bridge uses lock-in control strategy.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, converter station starts three-phase Bypass Control scheme, until AC circuit breaker is fully disconnected.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
It stops and fills the present invention relates to the direct current of a kind of hybrid MMC topology of full-bridge-half-bridge split-phase and AC circuit breaker cooperation
It sets and method, belongs to flexible direct-current transmission field.
Background technique
Flexible DC transmission (VSC-HVDC) is the direct current transportation skill of new generation after ac transmission, customary DC transmission of electricity
Art.Flexible DC transmission technology have it is active and reactive can be separately adjustable, weak grid access and low voltage ride-through capability it is strong, low friendship
The features such as stream filtering and reactive compensation demand.Flexible DC transmission is the important equipment for constructing smart grid, with traditional approach phase
Than flexible DC transmission is grid-connected in island power supply, the capacity-increasing transformation of urban power distribution network, AC system interconnection, large-scale wind power field
Etc. have stronger technical advantage, be change bulk power grid development pattern strategic choice.From German scholar R. in 2003
Marquardt and A. Lesnicar and its colleague propose modularization multi-level converter (modular multilevel
Converter, MMC) since, since the features such as it has easily extension, waveform is good, fault ride-through capacity is strong and modularized design, fits
For occasions such as high-powers, MMC is concerned in flexible direct-current transmission field.
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.But multi-terminal direct current transmission system and straight
Flowing electric network fault influences serious, the high voltage DC breaker development suitable for multi-terminal direct current transmission system and DC grid engineer application
It is difficult and involve great expense.Therefore, the DC Line Fault of multi-terminal direct current transmission system and DC grid cutting is urgently to be resolved asks
Topic.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of hybrid MMC topologys of full-bridge-half-bridge split-phase
With the direct current cut-off device and method of AC circuit 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 cutout of a kind of hybrid MMC topology of full-bridge-half-bridge split-phase and AC circuit breaker cooperation
Method, comprising:
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.At the same time, the AC circuit breaker real-time monitoring electric current Idci on route i is not detected such as
To line current zero crossing, Taci=0 is exported to sequence controller, such as detects line current zero crossing, it is defeated to sequence controller
Taci=1 out.
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 combination are as follows: Tfi=1 and when Taci=0, converter station startup separator control program is right
The two-phase being made of half-bridge submodule uses Bypass Control strategy, uses lock-in control plan to the phase being made of full-bridge submodule
Slightly.After the starting of Fault Control strategy, inverter starts to export AC compounent on DC bus.
Zero crossing is detected to the AC circuit breaker on DC bus, exports Taci=1, alternating current interruption to sequence controller
Device is begun breaking.
The signal combination received when sequence controller are as follows: Tfi=1 and when Taci=1 illustrates that AC circuit breaker has been detected by
Current zero-crossing point, AC circuit breaker are begun breaking.Converter station starts three-phase Bypass Control scheme at this time, until AC circuit breaker is complete
It is complete to disconnect.
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 provide a kind of hybrid MMC topology of full-bridge-half-bridge split-phase cooperate with AC circuit breaker it is straight
Flow cut-off device, comprising:
MMC converter station: mentioned MMC converter station is the hybrid MMC topology of half-bridge submodule-full-bridge submodule split-phase, wherein a, b two
It is mutually made of half-bridge submodule, c phase is made of full-bridge submodule.MMC converter station undertakes rectification, inversion function when normal operation.
After failure occurs, when sequence controller receives signal combination are as follows: Tfi=1 and when Taci=0, converter station startup separator controlling party
Case uses Bypass Control strategy to the two-phase being made of half-bridge submodule, to the phase being made of full-bridge submodule using locking
Control strategy, inverter starts to export AC compounent on DC bus at this time.When the signal combination that sequence controller receives are as follows:
Tfi=1 and when Taci=1, illustrates that AC circuit breaker has been detected by current zero-crossing point, AC circuit breaker is begun breaking.It changes at this time
Stream station starting three-phase Bypass Control scheme, until AC circuit breaker is fully disconnected.
AC circuit breaker: mentioned AC circuit breaker is regular alternating current breaker, is able to detect DC line zero passage point moment
And to output signal of time sequence controller Taci.
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 combination are as follows: Tfi=1 and when Taci=0,
Converter station startup separator control program uses Bypass Control strategy to the two-phase being made of half-bridge submodule, to by full-bridge submodule
The phase that block is constituted uses lock-in control strategy, and inverter starts to export AC compounent on DC bus at this time.When timing control
Signal that device processed receives combination are as follows: Tfi=1 and when Taci=1 illustrates that AC circuit breaker has been detected by current zero-crossing point, exchanges
Breaker is begun breaking.Converter station starts three-phase Bypass Control scheme at this time, until AC circuit breaker is fully disconnected.
Detailed description of the invention
Fig. 1 is the hybrid MMC topology of full-bridge-half-bridge bridge arm split-phase in the embodiment of the present invention
Fig. 2 is logic control chart 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 that full-bridge submodule is latched schematic diagram in the embodiment of the present invention
Fig. 5 is the current path after detecting DC side failure in the embodiment of the present invention, after control strategy investment at this time
Fig. 6 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 a kind of hybrid MMC topologys of full-bridge-half-bridge split-phase cooperate with AC circuit breaker it is straight
Cut-off device and method are flowed, the hybrid MMC topology of full-bridge-half-bridge split-phase is as shown in Figure 1:
Mentioned MMC converter station is the hybrid MMC topology of half-bridge submodule-full-bridge submodule split-phase, and wherein a, b two-phase are by half-bridge
Module composition, c phase are made of full-bridge submodule.
The embodiment of the invention provides a kind of hybrid MMC topologys of full-bridge-half-bridge split-phase cooperate with AC circuit breaker it is straight
Cut-off method is flowed, 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.At the same time, the AC circuit breaker real-time monitoring electric current Idci on route i is not examined such as
Line current zero crossing is measured, Taci=0 is exported to sequence controller, line current zero crossing is such as detected, to sequence controller
Export Taci=1.
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 combination are as follows: Tfi=1 and when Taci=0, converter station startup separator control program is right
The two-phase being made of half-bridge submodule uses Bypass Control strategy, uses lock-in control plan to the phase being made of full-bridge submodule
Slightly.After the starting of Fault Control strategy, inverter starts to export AC compounent on the line to direct current.
Zero crossing is detected to the AC circuit breaker on DC bus, exports Taci=1, alternating current interruption to sequence controller
Device is begun breaking.
The signal combination received when sequence controller are as follows: Tfi=1 and when Taci=1 illustrates that AC circuit breaker has been detected by
Current zero-crossing point, AC circuit breaker are begun breaking.Converter station starts three-phase Bypass Control scheme at this time, until AC circuit breaker is complete
It is complete to disconnect.
The embodiment of the invention provides a kind of hybrid MMC topologys of full-bridge-half-bridge split-phase cooperate with AC circuit breaker it is straight
Cut-off method is flowed, Neutron module bypasses schematic diagram as shown in figure 3, detailed process is as follows:
When sequence controller receives signal combination are as follows: Tfi=1 and when Taci=0, converter station startup separator control program, to by half
The two-phase that bridge submodule is constituted uses Bypass Control strategy.At this point for the half-bridge submodule of a, b two-phase, controls signal and make son
RED sector in figure is only connected in module, so that converter station exports waves AC to DC side.
The embodiment of the invention provides a kind of hybrid MMC topologys of full-bridge-half-bridge split-phase cooperate with AC circuit breaker it is straight
Cut-off method is flowed, wherein full-bridge submodule is latched schematic diagram as shown in figure 4, detailed process is as follows:
When sequence controller receives signal combination are as follows: Tfi=1 and when Taci=0, converter station startup separator control program, to by complete
What bridge submodule was constituted mutually uses lock-in control strategy.At this point for the full-bridge submodule of C phase, controls signal and make submodule only
RED sector in figure is connected, so that C phase and DC side separate.
The embodiment of the invention provides a kind of hybrid MMC topologys of full-bridge-half-bridge split-phase cooperate with AC circuit breaker it is straight
Cut-off method is flowed, after detecting DC side failure, the control strategy of three-phase and current path at this time are as shown in figure 5, specific
Process is as follows:
When sequence controller receives signal combination are as follows: Tfi=1 and when Taci=0, converter station startup separator control program, to by half
The two-phase that bridge submodule is constituted uses Bypass Control strategy, uses lock-in control strategy to the phase being made of full-bridge submodule.
Specific current path is as shown in Figure 5.Blue dotted line is actual current access, by individual-phase control, so that converter station is detecting
Zero crossing is generated to AC line trackside output of ac after to DC Line Fault.
The embodiment of the invention provides a kind of hybrid MMC topologys of full-bridge-half-bridge split-phase cooperate with AC circuit breaker it is straight
Cut-off method is flowed, wherein the faulty line current waveform after investment Fault Control strategy is as shown in fig. 6, event after failure strategy investment
AC compounent is generated on barrier route, AC circuit breaker detects zero crossing and cuts 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. the direct current cut-off method of a kind of hybrid MMC topology of full-bridge-half-bridge split-phase and AC circuit breaker cooperation, feature exist
In, comprising:
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 uses Bypass Control strategy to the two-phase being made of half-bridge submodule, to by full-bridge
The phase that submodule is constituted uses lock-in control strategy；
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, converter station starting at this time three
Phase Bypass Control scheme, until AC circuit breaker is fully disconnected.
2. the hybrid MMC topology of full-bridge according to claim 1-half-bridge split-phase and the direct current of AC circuit breaker cooperation stop
Method, which is characterized in that sensor and AC circuit breaker real-time monitoring line status amount on route, and in real time to timing control
Device transmission state signal.
3. the hybrid MMC topology of full-bridge according to claim 1-half-bridge split-phase and the direct current of AC circuit breaker cooperation stop
Method, which is characterized in that after failure occurs, each line relay is based on voltage and current Data Detection failure and identifies failure classes
Type, and Fault Control enabling signal is exported to sequence controller.
4. the hybrid MMC topology of full-bridge according to claim 1-half-bridge split-phase and the direct current of AC circuit breaker cooperation stop
Method, which is characterized in that converter station startup separator control program, comprising:
Bypass Control strategy is used to the two-phase being made of half-bridge submodule, to the phase being made of full-bridge submodule using locking
Control strategy；After the starting of Fault Control strategy, inverter starts to export AC compounent on the line to direct current.
5. the hybrid MMC topology of full-bridge according to claim 1-half-bridge split-phase and the direct current of AC circuit breaker cooperation stop
Method, which is characterized in that converter station zero crossing Bypass Control, comprising:
Detect that zero crossing, AC circuit breaker are begun breaking to the AC circuit breaker on DC bus, converter station starting at this time three
Phase Bypass Control scheme, until AC circuit breaker is fully disconnected；
A kind of direct current cut-off device of the hybrid MMC topology of full-bridge-half-bridge split-phase and AC circuit breaker cooperation, which is characterized in that
Including the collaboration of full-bridge-half-bridge split-phase type mixing MMC topology, AC circuit breaker, line sensor, relay, sequence controller
Control device.
6. the hybrid MMC topology of full-bridge according to claim 6-half-bridge split-phase and the direct current of AC circuit breaker cooperation stop
Device, which is characterized in that MMC converter station is the hybrid MMC topology of half-bridge submodule-full-bridge submodule split-phase, comprising: wherein
A, b two-phase is made of half-bridge submodule, and c phase is made of full-bridge submodule；MMC converter station undertakes rectification, inversion when normal operation
Function；
After failure occurs, when sequence controller receives signal combination are as follows: Tfi=1 and when Taci=0, the control of converter station startup separator
Scheme uses Bypass Control strategy to the two-phase being made of half-bridge submodule, uses and close to the phase being made of full-bridge submodule
Lock control strategy, inverter starts to export AC compounent on DC bus at this time；
The signal combination received when sequence controller are as follows: Tfi=1 and when Taci=1 illustrates that AC circuit breaker has been detected by electric current
Zero crossing, AC circuit breaker are begun breaking；
Converter station starts three-phase Bypass Control scheme at this time, until AC circuit breaker is fully disconnected.
7. the hybrid MMC topology of full-bridge according to claim 6-half-bridge split-phase and the direct current of AC circuit breaker cooperation stop
Device, which 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 DC line current over-zero point moment and to timing control
Device exports the signal of this unit.
8. the hybrid MMC topology of full-bridge according to claim 6-half-bridge split-phase and the direct current of AC circuit breaker cooperation stop
Device, which is characterized in that sequence controller design, 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 Fault Control mode of inverter；When sequence controller receives signal combination are as follows: Tfi=1 and when Taci=0, converter station opens
Dynamic Fault Control scheme uses Bypass Control strategy to the two-phase being made of half-bridge submodule, to what is be made of full-bridge submodule
One phase uses lock-in control strategy, and inverter starts to export AC compounent on DC bus at this time；When sequence controller receives
Signal combination are as follows: Tfi=1 and when Taci=1 illustrates that AC circuit breaker has been detected by current zero-crossing point, AC circuit breaker is opened
Begin to disconnect；Converter station starts three-phase Bypass Control scheme at this time, until AC circuit breaker is fully disconnected.
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