CN107453386A - Power transmission control method and flexible DC power transmission device - Google Patents
Power transmission control method and flexible DC power transmission device Download PDFInfo
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- CN107453386A CN107453386A CN201710733496.7A CN201710733496A CN107453386A CN 107453386 A CN107453386 A CN 107453386A CN 201710733496 A CN201710733496 A CN 201710733496A CN 107453386 A CN107453386 A CN 107453386A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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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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- Direct Current Feeding And Distribution (AREA)
Abstract
This disclosure relates to a kind of power transmission control method and flexible DC power transmission device.This method is applied in flexible DC power transmission device, including：The electric current of multiple positions inside the ac voltage and device of the outlet of acquisition device；In the case where ac voltage is less than or equal to voltage threshold, according to the electric current of multiple positions, whether judgment means meet troubles inside the sample space condition；In the case where meeting troubles inside the sample space condition, control device does not perform low voltage crossing strategy.In accordance with an embodiment of the present disclosure, can be when ac voltage drops into voltage threshold, troubles inside the sample space is determined whether according to the curent change of multiple positions inside power transmitting device, and not perform low voltage crossing strategy during troubles inside the sample space, so as to realize that the subregion of flexible direct current power transmission system failure identifies, and the excessively stream of power transmitting device internal module can be avoided to damage.
Description
Technical field
This disclosure relates to power electronics control technology field, more particularly to a kind of power transmission control method and flexible DC power transmission
Device.
Background technology
Technology of HVDC based Voltage Source Converter is a kind of D.C. high voltage transmission (VSC-HVDC) technology based on voltage source converter.Should
Technology of transmission of electricity have active reactive can reactive-load compensation separately adjustable, without Large Copacity and wave filter, be not in commutation failure,
Receiving end may connect to the advantages that passive system, be mainly used in the applied fields such as grid-connected power generation system networking, the connection of asynchronous power network
Scape.
In the related art, when flexible direct current power transmission system is connected to active power network, in face of the Voltage Drop failure of power network,
Need to take steps to tackle, wherein, low voltage ride-through function is a kind of measure commonplace at present.However, Voltage Drop
Failure is likely to occur in outside the Nei Huo areas of area of flexible direct current power transmission system, when Voltage Drop failure occurs in flexible DC power transmission system
When in the area of system, bridge arm current maximum caused by failure and bridge arm current rate of change are all bigger, the submodule of internal system
It may be damaged due to excessively stream.Therefore, it is necessary to take troubles inside the sample space and external area error different treatment measures.
The content of the invention
In view of this, the present disclosure proposes a kind of power transmission control method and flexible DC power transmission device.
According to the one side of the disclosure, there is provided a kind of power transmission control method, this method fill applied to flexible DC power transmission
In putting, this method includes：
Obtain the electric current of multiple positions inside the ac voltage and described device of the outlet of described device；
In the case where the ac voltage is less than or equal to voltage threshold, according to the electric current of the multiple position, sentence
Whether disconnected described device meets troubles inside the sample space condition；
In the case where meeting the troubles inside the sample space condition, control described device does not perform low voltage crossing strategy.
In a kind of possible implementation, this method also includes：
In the case where being unsatisfactory for the troubles inside the sample space condition, control described device performs low voltage crossing strategy.
In a kind of possible implementation, according to the electric current of the multiple position, judge whether described device meets area
Internal fault condition, including：
Obtain the difference between the electric current of the multiple position；
It is more than or equal to current threshold in the difference, and in the case that the duration is more than or equal to time threshold, sentences
Disconnected described device meets troubles inside the sample space condition.
In a kind of possible implementation, the electric current of the multiple position includes：First electricity of converter transformer valve-side
Stream, the second electric current of starting-up later time valve side, upper bridge arm the first reactor valve side the 3rd electric current, the second reactor of lower bridge arm
The 4th electric current, the 5th electric current of positive pole and the 6th electric current of negative pole of valve side,
Wherein, the difference includes at least one of following difference：
Difference between first electric current and second electric current；
Difference between second electric current and the 3rd electric current and the 4th electric current；
Difference between 3rd electric current and the 5th electric current；
Difference between 4th electric current and the 6th electric current.
In a kind of possible implementation, methods described also includes：
In the case where meeting the troubles inside the sample space condition, control described device open circuit.
According to another aspect of the present disclosure, there is provided a kind of flexible DC power transmission device, the device include：
Starting-up later time, converter power transformer is connected to by outlet；
Three-phase converter circuit, include per phase converter circuit：
Upper bridge arm, the starting-up later time is connected to, has been arranged in series the first reactor and multiple first sub- transverters；
Lower bridge arm, is connected to the starting-up later time, has been arranged in series the second reactor and multiple second sub- transverters；
Control module, it is configured as：
Obtain the electric current of multiple positions inside the ac voltage and described device of the outlet of described device；
In the case where the ac voltage is less than or equal to voltage threshold, according to the electric current of the multiple position, sentence
Whether disconnected described device meets troubles inside the sample space condition；
In the case where meeting the troubles inside the sample space condition, control described device does not perform low voltage crossing strategy.
In a kind of possible implementation, the control module is additionally configured to：
In the case where being unsatisfactory for the troubles inside the sample space condition, control described device performs low voltage crossing strategy.
In a kind of possible implementation, according to the electric current of the multiple position, judge whether described device meets area
Internal fault condition, including：
Obtain the difference between the electric current of the multiple position；
It is more than or equal to current threshold in the difference, and in the case that the duration is more than or equal to time threshold, sentences
Disconnected described device meets troubles inside the sample space condition.
In a kind of possible implementation, the electric current of the multiple position includes：The of the converter transformer valve-side
One electric current, the second electric current of the starting-up later time valve side, the upper bridge arm the first reactor valve side the 3rd electric current, it is described under
The 4th electric current, the 5th electric current of positive pole and the 6th electric current of negative pole of second reactor valve side of bridge arm,
Wherein, the difference includes at least one of following difference：
Difference between first electric current and second electric current；
Difference between second electric current and the 3rd electric current and the 4th electric current；
Difference between 3rd electric current and the 5th electric current；
Difference between 4th electric current and the 6th electric current.
In a kind of possible implementation, the control module is additionally configured to：
In the case where meeting the troubles inside the sample space condition, control described device open circuit.
According to the power transmission control method of the embodiment of the present disclosure and flexible DC power transmission device, can fall in ac voltage
During to voltage threshold, troubles inside the sample space is determined whether according to the curent change of multiple positions inside power transmitting device, and sentencing
Break not perform low voltage crossing strategy during troubles inside the sample space, so as to realize that the subregion of flexible direct current power transmission system failure identifies, and
The excessively stream of power transmitting device internal module can be avoided to damage.
According to below with reference to the accompanying drawings becoming to detailed description of illustrative embodiments, the further feature and aspect of the disclosure
It is clear.
Brief description of the drawings
Comprising in the description and the accompanying drawing of a part for constitution instruction and specification together illustrate the disclosure
Exemplary embodiment, feature and aspect, and for explaining the principle of the disclosure.
Fig. 1 is a kind of structural representation of flexible DC power transmission device according to an exemplary embodiment.
Fig. 2 is a kind of flow chart of power transmission control method according to an exemplary embodiment.
Fig. 3 is the schematic diagram of the calculating of the ac voltage according to an exemplary embodiment.
Fig. 4 is a kind of step S12 of power transmission control method according to exemplary embodiment flow chart.
Fig. 5 is a kind of flow chart of power transmission control method according to an exemplary embodiment.
Fig. 6 is a kind of flow chart of power transmission control method according to an exemplary embodiment.
Fig. 7 is the schematic diagram of the low voltage crossing strategy according to an exemplary embodiment.
Fig. 8 is a kind of block diagram of flexible DC power transmission device according to an exemplary embodiment.
Embodiment
Describe various exemplary embodiments, feature and the aspect of the disclosure in detail below with reference to accompanying drawing.It is identical in accompanying drawing
Reference represent the same or analogous element of function.Although the various aspects of embodiment are shown in the drawings, remove
Non-specifically point out, it is not necessary to accompanying drawing drawn to scale.
Special word " exemplary " is meant " being used as example, embodiment or illustrative " herein.Here as " exemplary "
Illustrated any embodiment should not necessarily be construed as preferred or advantageous over other embodiments.
In addition, in order to better illustrate the disclosure, numerous details is given in embodiment below.
It will be appreciated by those skilled in the art that without some details, the disclosure can equally be implemented.In some instances, for
Method, means, element and circuit well known to those skilled in the art are not described in detail, in order to highlight the purport of the disclosure.
Fig. 1 is a kind of structural representation of flexible DC power transmission device according to an exemplary embodiment.Such as Fig. 1 institutes
Show, starting-up later time 101 and three-phase converter circuit can be included according to the flexible DC power transmission device 100 of the embodiment of the present disclosure.
Wherein, starting-up later time 101 is connected to converter power transformer 201 by outlet so that flexible DC power transmission device 100 is become by the change of current
The incoming transport system 200 of depressor 201, thus allows for power Transmission.
In a kind of possible implementation, three-phase converter circuit can be modularization multi-level converter (MMC), by six
Individual bridge arm composition, is divided into symmetrical three-phase, and the converter circuit 102 per phase can include two bridge arms (upper bridge arm and lower bridge arm).
Upper bridge arm is connected to starting-up later time 101, has been arranged in series the first reactor 103 and multiple first sub- transverters 104；Lower bridge arm
Starting-up later time 101 is connected to, has been arranged in series the second reactor 105 and multiple second sub- transverters 106.Upper bridge arm and lower bridge
It is in parallel between arm.Wherein, three-phase converter circuit can access submodule (the first sub- transverter 104 of transverter by increasing and decreasing
With the second sub- transverter 106) quantity come meet different power and voltage class requirement, be easy to implement Integration Design, shorten
It is the project cycle, cost-effective.
Fig. 2 is a kind of flow chart of power transmission control method according to an exemplary embodiment.Implemented according to the disclosure
The power transmission control method of example can be applied in flexible DC power transmission device as shown in Figure 1.As shown in Fig. 2 the transmission of electricity controlling party
Method includes：
Step S11, obtain the electricity of multiple positions inside the ac voltage and described device of the outlet of described device
Stream；
Step S12, in the case where the ac voltage is less than or equal to voltage threshold, according to the multiple position
Electric current, judges whether described device meets troubles inside the sample space condition；
Step S13, in the case where meeting the troubles inside the sample space condition, control described device does not perform low voltage crossing plan
Slightly.
In accordance with an embodiment of the present disclosure, can be when ac voltage drops into voltage threshold, inside power transmitting device
The curent changes of multiple positions determine whether troubles inside the sample space, and do not perform low voltage crossing when being judged as troubles inside the sample space
Strategy, so as to realize that the subregion of flexible direct current power transmission system failure identifies, and the excessively stream of power transmitting device internal module can be avoided
Damage.
For example, the ac voltage of the outlet of the device can be obtained.As shown in figure 1, the ac voltage can be with
It is voltage (change of current change voltage on line side) UacD at the 202 of the side of converter power transformer 201.Fig. 3 is shown according to an exemplary embodiment
The schematic diagram of the calculating of the ac voltage gone out.As shown in figure 3, can (voltage of three-phase be for example respectively to voltage UacD
UacDa, UacDb and UacDc) progress coordinate transform, two cordic phase rotators (dq) from three-phase instantaneous coordinate (abc) to positive sequence,
Obtain phase voltage Ud, Uq of two-phase；Positive-sequence component extraction is carried out to phase voltage Ud, Uq, namely prolonged phase voltage Ud, Uq in Fig. 3
When 1/4 cycle after be added respectively with former Ud, Uq, obtain the first result；Cause again from status after being multiplied by 0.5 to the first result respectively
It is not multiplied, obtains the second result；Evolution after two the second results addeds, you can obtain positive sequence voltage modulus value.The positive sequence voltage mould
Value can be used as the ac voltage of the outlet of the device.It should be appreciated that various calculations well known in the art can be used
Ac voltage is obtained, the disclosure is not construed as limiting to this.
In a kind of possible implementation, the electric current of multiple positions inside the device can be obtained.Wherein, Duo Gewei
The electric current put may include：First electric current IacY of converter transformer valve-side 107, the second electric current IvC of starting-up later time valve side 108,
3rd electric current IbP of the first reactor valve side 109 of upper bridge arm, the 4th electric current of the second reactor valve side 110 of lower bridge arm
IbN, the 5th electric current IdP of positive pole 111 and the 6th electric current IdN of negative pole 112.As shown in figure 1, can be in converter transformer valve
Side 107, starting-up later time valve side 108, the first reactor valve side 109 of upper bridge arm, the second reactor valve side 110 of lower bridge arm, just
Distinguish at pole 111 and negative pole 112, current sensor is provided with, so as to measure the electric current of each position.It should be appreciated that it can adopt
The electric current of each position is obtained with various modes well known in the art, the disclosure is not construed as limiting to this.
In a kind of possible implementation, in step s 12, it is less than or equal to the feelings of voltage threshold in ac voltage
Under condition, according to the electric current of the multiple position, judge whether described device meets troubles inside the sample space condition.
For example, the ac voltage exported for the device obtained, it can be determined that whether the ac voltage is small
In or equal to voltage threshold.The voltage threshold can be preset according to system requirements, can be, for example, system voltage reference
The 0.7-0.9 (perunit value 0.7-0.9pu) of value, for example, the voltage threshold can be using value as 0.85pu.When ac voltage is small
When 0.85pu, it is believed that Voltage Drop failure occurs.The disclosure is not construed as limiting to the specific value of voltage threshold.
Fig. 4 is a kind of step S12 of power transmission control method according to exemplary embodiment flow chart.Such as Fig. 4
Shown, step S12 includes：
Step S121, obtain the difference between the electric current of the multiple position；
Step S122, it is more than or equal to current threshold in the difference, and the duration is more than or equal to time threshold
In the case of, judge that described device meets troubles inside the sample space condition.
In a kind of possible implementation, the difference may include at least one of following difference：
Difference between first electric current and second electric current；
Difference between second electric current and the 3rd electric current and the 4th electric current；
Difference between 3rd electric current and the 5th electric current；
Difference between 4th electric current and the 6th electric current.
For example, in the case where Voltage Drop failure occurs, between the electric current that each position can be obtained respectively
Difference.For example, the difference ID1 between the first electric current IacY and the second electric current IvC；Second electric current IvC and the 3rd electric current IbP and
Difference ID2 between four electric current IbN；Difference ID3 between 3rd electric current IbP and the 5th electric current IdP；And the 4th electric current IbN
With the difference ID4 between the 6th electric current IdN.
In a kind of possible implementation, it is contemplated that converter circuit 102 is three-phase, therefore the first electric current IacY of each phase
IacYa, IacYb, IacYc can be set to；Second electric current IvC of each phase can be set to IvCa, IvCb, IvCc；Respectively
3rd electric current IbP of phase can be set to IbPa, IbPb, IbPc；4th electric current IbN of each phase can be set to IbNa,
IbNb、IbNc。
In a kind of possible implementation, difference ID1a, ID1b, ID1c of each phase can represent as follows：
IDa1=IacYa-IvCa；
IDb1=IacYb-IvCb；
IDc1=IacYc-IvCc；
ID1=MAX (| IDa1 |, | IDb1 |, | IDc1 |) (1)
As shown in formula (1), the maximum in difference ID1a, ID1b, ID1c of each phase can be defined as the first electric current
Difference ID1 between IacY and the second electric current IvC.Wherein, the first electric current IacY and starting-up later time of converter transformer valve-side 107
Second electric current IvC of valve side 108 positive direction can be to flow to valve side by net side.
In a kind of possible implementation, difference ID2a, ID2b, ID2c of each phase can represent as follows：
IDa2=IvCa- (IbNa-IbPa)；
IDb2=IvCb- (IbNb-IbPb)；
IDc2=IvCc- (IbNc-IbPc)；
ID2=MAX (| IDa2 |, | IDb2 |, | IDc2 |) (2)
As shown in formula (2), the maximum in difference ID2a, ID2b, ID2c of each phase can be defined as the second electric current
Difference ID2 between IvC and the 3rd electric current IbP and the 4th electric current IbN.Wherein, the of the first reactor valve side 109 of upper bridge arm
4th electric current IbN of the second reactor valve side 110 of three electric current IbP and lower bridge arm positive direction can be to be flowed to bear by positive pole
Pole.
In a kind of possible implementation, difference ID3 can represent as follows：
ID3=(IbPa+IbPb+IbPc)-IdP (3)
As shown in formula (3), it will can be done after the 3rd electric current IbPa, IbPb, IbPc summations of each phase with the 5th electric current IdP
Difference, so as to obtain the difference ID3 between the 3rd electric current IbP and the 5th electric current IdP.Wherein, the 5th electric current IdP of positive pole 111
Positive direction is to flow to negative pole by positive pole.
In a kind of possible implementation, difference ID4 can represent as follows：
ID4=(IbNa+IbNb+IbNc)-IdN (4)
As shown in formula (4), it will can be done after the 4th electric current IbNa, IbNb, IbNc summations of each phase with the 6th electric current IdN
Difference, so as to obtain the difference ID4 between the 4th electric current IbN and the 6th electric current IdN.Wherein, the 6th electric current IdN of negative pole 112
Positive direction is to flow to negative pole by positive pole.
In a kind of possible implementation, if in difference ID1, ID2, ID3, ID4 of the electric current of each position extremely
Few one is more than or equal to current threshold, and is more than or equal to time threshold more than or equal to the duration of current threshold, then
It may determine that device meets troubles inside the sample space condition.Wherein, the current threshold can be preset according to system requirements, can be such as
For the 0.05-0.1 (perunit value 0.05-0.1pu) of system power a reference value, current threshold can for example be set as 0.1pu.Should
Time threshold can also be preset according to system requirements, can be, for example, 0-20ms.Time threshold is shorter may to produce mistake
Sentence, time threshold is longer may to cause response not in time, and time threshold can for example be set as 10ms.The disclosure is to current threshold
It is not construed as limiting with the specific value of time threshold.
In a kind of possible implementation, in step s 13, in the case where meeting the troubles inside the sample space condition, control
Described device processed does not perform low voltage crossing strategy.For example, when at least one in difference ID1, ID2, ID3, ID4 is more than
Or equal to current threshold (0.1pu), and when the duration is more than or equal to time threshold (10ms), it is believed that meet in area
Fault condition, Voltage Drop failure occur in the area of power transmitting device 100.In such a case it is possible to control power transmitting device 100 not
Low voltage crossing strategy, namely locking flexible direct current low voltage ride-through function are performed, so as to avoid power transmitting device internal module (example
Such as the first sub- 104 and second sub- transverter 106 of transverter) excessively stream damage.
Fig. 5 is a kind of flow chart of power transmission control method according to an exemplary embodiment.It is as shown in figure 5, described
Method also includes：
Step S14, in the case where meeting the troubles inside the sample space condition, control described device open circuit.
For example, when at least one in difference ID1, ID2, ID3, ID4 is more than or equal to current threshold (0.1pu),
And when the duration is more than or equal to time threshold (10ms), it is believed that meet troubles inside the sample space condition, Voltage Drop failure
Occur in the area of power transmitting device 100.In such a case it is possible to the open circuit of power transmitting device 100 is controlled, namely quick lock tripping operation,
So as to avoid the excessively stream of power transmitting device internal module (such as first sub- 104 and second sub- transverter 106 of transverter) from damaging.
Fig. 6 is a kind of flow chart of power transmission control method according to an exemplary embodiment.It is as shown in fig. 6, described
Method also includes：
Step S15, in the case where being unsatisfactory for the troubles inside the sample space condition, control described device performs low voltage crossing plan
Slightly.
For example, when difference ID1, ID2, ID3, ID4 are respectively less than current threshold (0.1pu), or difference ID1, ID2,
One or more of ID3, ID4 are more than or equal to current threshold (0.1pu), but the duration is less than time threshold (10ms)
In the case of, it is believed that troubles inside the sample space condition is unsatisfactory for, Voltage Drop failure occurs outside the area of power transmitting device 100.In the feelings
Under condition, power transmitting device 100 can be controlled to perform low voltage crossing strategy.
Fig. 7 is the schematic diagram of the low voltage crossing strategy according to an exemplary embodiment.As shown in fig. 7, in one kind
In possible implementation, when ac voltage U is less than or equal to voltage threshold (such as U≤0.85pu), and it is unsatisfactory in area
During fault condition, it is believed that generating region external voltage falls failure, can perform low voltage crossing strategy.Wherein, low voltage crossing plan
The regulation for one end of control active power and one end of control DC voltage can be slightly embodied in.
In a kind of possible implementation, one end for controlling active power, active power close loop can be limited
Output, transient AC voltage is switched to control from Reactive Power Control or stable state Regulation Control by idle control；Treat alternating voltage
After recovery (such as alternating voltage U >=0.95pu), active power reference value refers to before climbing from currently practical performance number to failure
Value, idle control switch to Reactive Power Control or stable state Regulation Control by the control of transient AC voltage through climbing.
In a kind of possible implementation, one end for controlling DC voltage, the defeated of direct current pressure ring can be limited
Go out, idle control switches to transient AC voltage to control from Reactive Power Control or stable state Regulation Control；Treat that alternating voltage recovers
Afterwards (such as alternating voltage U>0.95pu), direct current pressure ring recovers voltage regulation function, and idle control from transient AC voltage by controlling
Reactive Power Control or stable state Regulation Control are switched to through climbing.
In this way, failure can be fallen to area's external voltage by low voltage crossing strategy to handle, reduces system
System risk.
Fig. 8 is a kind of block diagram of flexible DC power transmission device according to an exemplary embodiment.As shown in figure 8, root
Flexible DC power transmission device 800 is additionally provided according to the exemplary embodiment of the disclosure, the power transmitting device 800 includes：Starting-up later time
801st, three-phase converter circuit 802 and control module 803.
In a kind of possible implementation, starting-up later time 801 is connected to converter power transformer 804 by outlet；Three-phase changes
Every phase converter circuit of current circuit 802 includes：Upper bridge arm, be connected to the starting-up later time, be arranged in series the first reactor with
And multiple first sub- transverters；Lower bridge arm, is connected to the starting-up later time, has been arranged in series the second reactor and multiple second
Sub- transverter.
In a kind of possible implementation, control module 803 is configured as：
Obtain the electric current of multiple positions inside the ac voltage and described device of the outlet of described device；
In the case where the ac voltage is less than or equal to voltage threshold, according to the electric current of the multiple position, sentence
Whether disconnected described device meets troubles inside the sample space condition；
In the case where meeting the troubles inside the sample space condition, control described device does not perform low voltage crossing strategy.
In a kind of possible embodiment, control module 803, which can be that single-chip microcomputer, CPU, MPU, FPGA etc. are any, to be entered
The processing component of row data processing, processing module 14 can be realized by special hardware circuit, can also pass through general procedure portion
Part combines executable logical order and realized, to perform the processing procedure of processing module 14.
In a kind of possible implementation, control module 803 is additionally configured to：
In the case where being unsatisfactory for the troubles inside the sample space condition, control described device performs low voltage crossing strategy.
In a kind of possible implementation, according to the electric current of the multiple position, judge whether described device meets area
Internal fault condition, including：
Obtain the difference between the electric current of the multiple position；
It is more than or equal to current threshold in the difference, and in the case that the duration is more than or equal to time threshold, sentences
Disconnected described device meets troubles inside the sample space condition.
In a kind of possible implementation, the electric current of the multiple position includes：The of the converter transformer valve-side
One electric current, the second electric current of the starting-up later time valve side, the upper bridge arm the first reactor valve side the 3rd electric current, it is described under
The 4th electric current, the 5th electric current of positive pole and the 6th electric current of negative pole of second reactor valve side of bridge arm,
Wherein, the difference includes at least one of following difference：
Difference between first electric current and second electric current；
Difference between second electric current and the 3rd electric current and the 4th electric current；
Difference between 3rd electric current and the 5th electric current；
Difference between 4th electric current and the 6th electric current.
In a kind of possible implementation, control module 803 is additionally configured to：
In the case where meeting the troubles inside the sample space condition, control described device open circuit.
In accordance with an embodiment of the present disclosure, can be when ac voltage drops into voltage threshold, inside power transmitting device
The curent changes of multiple positions determine whether troubles inside the sample space, and do not perform low voltage crossing when being judged as troubles inside the sample space
Strategy, so as to realize that the subregion of flexible direct current power transmission system failure identifies, and the excessively stream of power transmitting device internal module can be avoided
Damage.
The disclosure can be system, method and/or computer program product.Computer program product can include computer
Readable storage medium storing program for executing, containing for making processor realize the computer-readable program instructions of various aspects of the disclosure.
Computer-readable recording medium can keep and store to perform the tangible of the instruction that uses of equipment by instruction
Equipment.Computer-readable recording medium for example can be-- but be not limited to-- storage device electric, magnetic storage apparatus, optical storage
Equipment, electromagnetism storage device, semiconductor memory apparatus or above-mentioned any appropriate combination.Computer-readable recording medium
More specifically example (non exhaustive list) includes：Portable computer diskette, hard disk, random access memory (RAM), read-only deposit
It is reservoir (ROM), erasable programmable read only memory (EPROM or flash memory), static RAM (SRAM), portable
Compact disk read-only storage (CD-ROM), digital versatile disc (DVD), memory stick, floppy disk, mechanical coding equipment, for example thereon
It is stored with punch card or groove internal projection structure and the above-mentioned any appropriate combination of instruction.Calculating used herein above
Machine readable storage medium storing program for executing is not construed as instantaneous signal in itself, the electromagnetic wave of such as radio wave or other Free propagations, leads to
Cross the electromagnetic wave (for example, the light pulse for passing through fiber optic cables) of waveguide or the propagation of other transmission mediums or transmitted by electric wire
Electric signal.
Computer-readable program instructions as described herein can be downloaded to from computer-readable recording medium it is each calculate/
Processing equipment, or outer computer or outer is downloaded to by network, such as internet, LAN, wide area network and/or wireless network
Portion's storage device.Network can include copper transmission cable, optical fiber is transmitted, is wirelessly transferred, router, fire wall, interchanger, gateway
Computer and/or Edge Server.Adapter or network interface in each calculating/processing equipment receive from network to be counted
Calculation machine readable program instructions, and the computer-readable program instructions are forwarded, for the meter being stored in each calculating/processing equipment
In calculation machine readable storage medium storing program for executing.
For perform the disclosure operation computer program instructions can be assembly instruction, instruction set architecture (ISA) instruction,
Machine instruction, machine-dependent instructions, microcode, firmware instructions, condition setup data or with one or more programming languages
The source code or object code that any combination is write, programming language of the programming language including object-oriented-such as
Smalltalk, C++ etc., and conventional procedural programming languages-such as " C " language or similar programming language.Computer
Readable program instructions fully can on the user computer perform, partly perform on the user computer, be only as one
Vertical software kit performs, part performs or completely in remote computer on the remote computer on the user computer for part
Or performed on server.In the situation of remote computer is related to, remote computer can pass through network-bag of any kind
LAN (LAN) or wide area network (WAN)-be connected to subscriber computer are included, or, it may be connected to outer computer (such as profit
Pass through Internet connection with ISP).In certain embodiments, by using computer-readable program instructions
Status information carry out personalized customization electronic circuit, such as PLD, field programmable gate array (FPGA) or can
Programmed logic array (PLA) (PLA), the electronic circuit can perform computer-readable program instructions, so as to realize each side of the disclosure
Face.
Referring herein to the method, apparatus (system) according to the embodiment of the present disclosure and the flow chart of computer program product and/
Or block diagram describes various aspects of the disclosure.It should be appreciated that each square frame and flow chart of flow chart and/or block diagram and/
Or in block diagram each square frame combination, can be realized by computer-readable program instructions.
These computer-readable program instructions can be supplied to all-purpose computer, special-purpose computer or other programmable datas
The processor of processing unit, so as to produce a kind of machine so that these instructions are passing through computer or other programmable datas
During the computing device of processing unit, work(specified in one or more of implementation process figure and/or block diagram square frame is generated
The device of energy/action.These computer-readable program instructions can also be stored in a computer-readable storage medium, these refer to
Order causes computer, programmable data processing unit and/or other equipment to work in a specific way, so as to be stored with instruction
Computer-readable medium then includes a manufacture, and it is included in one or more of implementation process figure and/or block diagram square frame
The instruction of the various aspects of defined function/action.
Computer-readable program instructions can also be loaded into computer, other programmable data processing units or other
In equipment so that series of operation steps is performed on computer, other programmable data processing units or miscellaneous equipment, with production
Raw computer implemented process, so that performed on computer, other programmable data processing units or miscellaneous equipment
Instruct function/action specified in one or more of implementation process figure and/or block diagram square frame.
Flow chart and block diagram in accompanying drawing show the system, method and computer journey of multiple embodiments according to the disclosure
Architectural framework in the cards, function and the operation of sequence product.At this point, each square frame in flow chart or block diagram can generation
One module of table, program segment or a part for instruction, the module, program segment or a part for instruction include one or more use
In the executable instruction of logic function as defined in realization.At some as the function of in the realization replaced, being marked in square frame
Can be with different from the order marked in accompanying drawing generation.For example, two continuous square frames can essentially be held substantially in parallel
OK, they can also be performed in the opposite order sometimes, and this is depending on involved function.It is also noted that block diagram and/or
The combination of each square frame and block diagram in flow chart and/or the square frame in flow chart, function or dynamic as defined in performing can be used
The special hardware based system made is realized, or can be realized with the combination of specialized hardware and computer instruction.
It is described above the presently disclosed embodiments, described above is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.In the case of without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes will be apparent from for the those of ordinary skill in art field.The selection of term used herein, purport
The principle of each embodiment, practical application or technological improvement to the technology in market are best being explained, or is leading this technology
Other those of ordinary skill in domain are understood that each embodiment disclosed herein.
Claims (10)
1. a kind of power transmission control method, it is characterised in that methods described is applied in flexible DC power transmission device, methods described bag
Include：
Obtain the electric current of multiple positions inside the ac voltage and described device of the outlet of described device；
In the case where the ac voltage is less than or equal to voltage threshold, according to the electric current of the multiple position, institute is judged
State whether device meets troubles inside the sample space condition；
In the case where meeting the troubles inside the sample space condition, control described device does not perform low voltage crossing strategy.
2. according to the method for claim 1, it is characterised in that methods described also includes：
In the case where being unsatisfactory for the troubles inside the sample space condition, control described device performs low voltage crossing strategy.
3. according to the method for claim 1, it is characterised in that according to the electric current of the multiple position, judge described device
Whether troubles inside the sample space condition is met, including：
Obtain the difference between the electric current of the multiple position；
It is more than or equal to current threshold in the difference, and in the case that the duration is more than or equal to time threshold, judges institute
State device and meet troubles inside the sample space condition.
4. according to the method for claim 3, it is characterised in that the electric current of the multiple position includes：Converter transformer valve
First electric current of side, the second electric current of starting-up later time valve side, the 3rd electric current of the first reactor valve side of upper bridge arm, lower bridge arm
The 4th electric current, the 5th electric current of positive pole and the 6th electric current of negative pole of second reactor valve side,
Wherein, the difference includes at least one of following difference：
Difference between first electric current and second electric current；
Difference between second electric current and the 3rd electric current and the 4th electric current；
Difference between 3rd electric current and the 5th electric current；
Difference between 4th electric current and the 6th electric current.
5. according to the method for claim 1, it is characterised in that methods described also includes：
In the case where meeting the troubles inside the sample space condition, control described device open circuit.
6. a kind of flexible DC power transmission device, it is characterised in that described device includes：
Starting-up later time, converter power transformer is connected to by outlet；
Three-phase converter circuit, include per phase converter circuit：
Upper bridge arm, the starting-up later time is connected to, has been arranged in series the first reactor and multiple first sub- transverters；
Lower bridge arm, is connected to the starting-up later time, has been arranged in series the second reactor and multiple second sub- transverters；
Control module, it is configured as：
Obtain the electric current of multiple positions inside the ac voltage and described device of the outlet of described device；
In the case where the ac voltage is less than or equal to voltage threshold, according to the electric current of the multiple position, institute is judged
State whether device meets troubles inside the sample space condition；
In the case where meeting the troubles inside the sample space condition, control described device does not perform low voltage crossing strategy.
7. device according to claim 6, it is characterised in that the control module is additionally configured to：
In the case where being unsatisfactory for the troubles inside the sample space condition, control described device performs low voltage crossing strategy.
8. device according to claim 6, it is characterised in that according to the electric current of the multiple position, judge described device
Whether troubles inside the sample space condition is met, including：
Obtain the difference between the electric current of the multiple position；
It is more than or equal to current threshold in the difference, and in the case that the duration is more than or equal to time threshold, judges institute
State device and meet troubles inside the sample space condition.
9. device according to claim 8, it is characterised in that the electric current of the multiple position includes：The change of current transformation
First electric current of device valve side, the second electric current of the starting-up later time valve side, the upper bridge arm the first reactor valve side the 3rd
Electric current, the lower bridge arm the second reactor valve side the 4th electric current, the 5th electric current of positive pole and the 6th electric current of negative pole,
Wherein, the difference includes at least one of following difference：
Difference between first electric current and second electric current；
Difference between second electric current and the 3rd electric current and the 4th electric current；
Difference between 3rd electric current and the 5th electric current；
Difference between 4th electric current and the 6th electric current.
10. device according to claim 6, it is characterised in that the control module is additionally configured to：
In the case where meeting the troubles inside the sample space condition, control described device open circuit.
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| CN201710733496.7A CN107453386A (en) | 2017-08-24 | 2017-08-24 | Power transmission control method and flexible DC power transmission device |
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Application publication date: 20171208 |