CN106532757A - Bipolar flexible direct current transmission system, converter station thereof and control method of converter station - Google Patents
Bipolar flexible direct current transmission system, converter station thereof and control method of converter station Download PDFInfo
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- CN106532757A CN106532757A CN201611027960.2A CN201611027960A CN106532757A CN 106532757 A CN106532757 A CN 106532757A CN 201611027960 A CN201611027960 A CN 201611027960A CN 106532757 A CN106532757 A CN 106532757A
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 104
- 230000007935 neutral effect Effects 0.000 claims abstract description 15
- 238000010586 diagram Methods 0.000 description 9
- 230000005611 electricity Effects 0.000 description 8
- 238000009826 distribution Methods 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
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Classifications
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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
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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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 embodiment of the invention provides a bipolar flexible direct-current transmission system, a converter station of the bipolar flexible direct-current transmission system and a control method of the converter station, relates to the technical field of electronics, and can inhibit short-circuit current generated when a direct-current side of the bipolar flexible direct-current transmission system fails. The converter station comprises a positive polarity converter part and a negative polarity converter part; the positive polarity current conversion part comprises a first current converter and a first current limiting module; the negative polarity current conversion part comprises a second current converter and a second current limiting module; the first current limiting module comprises a first current limiting resistor; one end of the first current limiting resistor is connected with the low-voltage end of the first current converter, and the other end of the first current limiting resistor is connected with the neutral bus; the first current limiting module further comprises a first bypass switch connected in parallel with the first current limiting resistor; the second current limiting module comprises a second current limiting resistor; one end of the second current limiting resistor is connected with the low-voltage end of the second current converter, and the other end of the second current limiting resistor is connected with the neutral bus; the second current limiting module also includes a second bypass switch in parallel with the second current limiting resistor.
Description
Technical field
The present invention relates to electronic technology field, more particularly to a kind of bipolar flexible direct current transmission system and its current conversion station, change
The control method at stream station.
Background technology
Technology of HVDC based Voltage Source Converter is a kind of VSC-HVDC technology, and rational control ＆ protection strategy determines flexible straight
Stream transmission system safe and stable operation.Its flexible Application performance makes which grid-connected and lonely in urban distribution network interconnection, clean energy resource
The island field such as power has broad application prospects.
In order to realize the requirement of high-capacity power conveying, need to increase submodule quantity to improve its electric pressure, but mistake
Multi-tool block is cascaded, and is increased valve control equipment control difficulty, therefore is adopted dipolar configuration form, is reducing single convertor unit
While module-cascade number, reaching same through-put power becomes a kind of feasible selection.
As the dc-side short-circuit fault that thunderbolt, ground connection, mountain fire etc. are caused is current bipolar flexible HVDC Transmission Technology institute
One of subject matter for facing.When bipolar flexible direct current transmission system DC side breaks down, due to its special topology knot
Structure, will produce very big short circuit current.The short circuit current flows through inverter so that the current stress increase of converter valve, or even
The damage of inverter is caused, while also seriously having threatened the safety of relevant device in faulty line.
The content of the invention
Embodiments of the invention provide a kind of bipolar flexible direct current transmission system and its current conversion station, the controlling party of current conversion station
Method, the short circuit current that bipolar flexible direct current transmission system DC side can be suppressed to produce when breaking down.
To reach above-mentioned purpose, embodiments of the invention are adopted the following technical scheme that：
A kind of first aspect, there is provided current conversion station for bipolar flexible direct current transmission system, including positive polarity change of current part
With negative polarity change of current part；The positive polarity change of current part includes the first inverter and the first current limliting module；The negative polarity is changed
Stream part includes the second inverter and the second current limliting module.
The first current limliting module includes the first current-limiting resistor, one end of first current-limiting resistor and described first
The low-pressure end connection of inverter, the other end are connected with neutral bus；The first current limliting module also includes and first current limliting
First by-pass switch of capacitor in parallel.
The second current limliting module includes the second current-limiting resistor, one end of second current-limiting resistor and described second
The low-pressure end connection of inverter, the other end are connected with neutral bus；The second current limliting module also includes and second current limliting
Second by-pass switch of capacitor in parallel.
Preferably, the first current limliting module also includes the first spark gap, one end of first spark gap and described the
The low-pressure end connection of one inverter, other end ground connection；And/or, the second current limliting module also includes the second spark gap, described the
One end of two spark gaps is connected with the low-pressure end of second inverter, other end ground connection.
Preferably, first current-limiting resistor includes at least one first sub- current-limiting resistors；Wherein, when described first
When current-limiting resistor includes at least two first sub- current-limiting resistors, at least two first sub- current-limiting resistors connecting and/or
Parallel way is arranged；And/or, second current-limiting resistor includes at least one second sub- current-limiting resistors；Wherein, when described
When second current-limiting resistor includes at least two second sub- current-limiting resistors, at least two second sub- current-limiting resistors are connecting
And/or parallel way is arranged.
A kind of second aspect, there is provided current conversion station for bipolar flexible direct current transmission system, including positive polarity change of current part
With negative polarity change of current part；The positive polarity change of current part includes the first inverter；The negative polarity change of current part includes second
Inverter；The current conversion station also includes the 3rd current limliting module；The 3rd current limliting module includes the 3rd current-limiting resistor, described
Three current-limiting resistors are connected on neutral bus；The 3rd current limliting module also includes in parallel with the 3rd current-limiting resistor
3rd by-pass switch.
Preferably, the 3rd current limliting module also includes the 3rd spark gap；One end of 3rd spark gap and institute
State neutral bus connection, other end ground connection；Wherein, the 3rd spark gap is arranged on the low-pressure end and the 3rd limit of inverter
Between flow resistor.
Preferably, the 3rd current limliting module includes two the 3rd spark gaps；The one of one of them the 3rd spark gap
End is connected with the low-pressure end of first inverter, other end ground connection；One end of another the 3rd spark gap and described
The low-pressure end connection of two inverters, other end ground connection.
Preferably, the 3rd current-limiting resistor includes at least one the 3rd sub- current-limiting resistors；Wherein, when the described 3rd
When current-limiting resistor includes at least two three sub- current-limiting resistors, at least two the 3rd sub- current-limiting resistors connecting and/or
Parallel way is arranged.
A kind of third aspect, there is provided bipolar flexible direct current transmission system, including sending end current conversion station and/or the receiving end change of current
Stand；The current conversion station of the sending end current conversion station and/or the receiving end current conversion station described in first aspect or second aspect.
Preferably, the sending end current conversion station and the receiving end current conversion station are the current conversion station.
A kind of fourth aspect, there is provided control method of the current conversion station as described in first aspect or second aspect, including：When send out
During raw direct-current short circuit, control by-pass switch is opened；Otherwise, control by-pass switch to close.
The embodiment of the present invention provides a kind of bipolar flexible direct current transmission system and its current conversion station, the control method of current conversion station,
By current limliting module is arranged in current conversion station, and current limliting module is made to include current-limiting resistor and by-pass switch connected in parallel, when
When the positive polarity change of current part of the current conversion station or negative polarity change of current part occur dc-side short-circuit fault, there is event by opening
The by-pass switch of the change of current part of barrier so that short circuit current can flow through the current-limiting resistor of the change of current part broken down, thus
The electric current in short-circuit loop can be suppressed, it is ensured that the safety of the relevant device on inverter and faulty line in current conversion station
Property.On this basis, as the operating current of the current conversion station is very big, when the current conversion station normal work, or short circuit is returned
When current value in road was reduced in normal range, by the by-pass switch for closing the change of current part broken down, limit can be avoided
In flow module, each device long-time is run under high current and is damaged.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of topological schematic diagram one of current conversion station provided in an embodiment of the present invention；
Fig. 2 is a kind of topological schematic diagram two of current conversion station provided in an embodiment of the present invention；
Fig. 3 (a) is a kind of topological schematic diagram one of current-limiting resistor provided in an embodiment of the present invention；
Fig. 3 (b) is a kind of topological schematic diagram two of current-limiting resistor provided in an embodiment of the present invention；
Fig. 4 is a kind of topological schematic diagram three of current conversion station provided in an embodiment of the present invention；
Fig. 5 is a kind of topological schematic diagram four of current conversion station provided in an embodiment of the present invention；
Fig. 6 is a kind of topological schematic diagram five of current conversion station provided in an embodiment of the present invention；
Fig. 7 is a kind of topological schematic diagram three of current-limiting resistor provided in an embodiment of the present invention；
Fig. 8 is a kind of topological schematic diagram of bipolar flexible direct current transmission system provided in an embodiment of the present invention.
Reference：
01- sending end current conversion stations；02- receiving end current conversion stations；The first inverters of 11-；The second inverters of 12-；21- first is limited
Flow module；22- the second current limliting modules；The 3rd current limliting modules of 23-；The first current-limiting resistors of 31-；The first sub- current-limiting resistances of 301-
Device；The second current-limiting resistors of 32-；The second sub- current-limiting resistors of 302-；The 3rd current-limiting resistors of 33-；The 3rd sub- current limlitings of 303- electricity
Resistance device；The first by-pass switches of 41-；The second by-pass switches of 42-；The 3rd by-pass switches of 43-；The first spark gaps of 51-；52- second keeps away
Thunder device；The 3rd spark gaps of 53-；100- positive polarity changes of current part；200- negative polarity changes of current part；300- neutral buses.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
The embodiment of the present invention provides a kind of current conversion station for bipolar flexible direct current transmission system, as shown in figure 1, including just
Polarity change of current part 100 and negative polarity change of current part 200；Positive polarity change of current part 100 includes the first inverter 11 and the first limit
Flow module 21；Negative polarity change of current part 200 includes the second inverter 12 and the second current limliting module 22.
First current limliting module 21 includes the first current-limiting resistor 31, one end and first inverter of the first current-limiting resistor 31
11 low-pressure end connection, the other end are connected with neutral bus 300；First current limliting module 21 also includes and the first current-limiting resistor 31
First by-pass switch 41 in parallel.
Second current limliting module 22 includes the second current-limiting resistor 32, one end and second inverter of the second current-limiting resistor 32
12 low-pressure end connection, the other end are connected with neutral bus 300；Second current limliting module 22 also includes and the second current-limiting resistor 32
Second by-pass switch 42 in parallel.
Wherein, the operation principle of the first current limliting module 21 is：When the positive polarity change of current 100 normal work of part, by the of first
Way switch 41 is closed；When positive polarity change of current part 100 occurs dc-side short-circuit fault, the first by-pass switch 41 is opened, and first
Current-limiting resistor 31 is used to suppress the short circuit current in positive polarity short-circuit loop；When the current reduction in positive polarity short-circuit loop is arrived
When in normal range, the first by-pass switch 41 is closed.
The operation principle of the second current limliting module 22 is：When the negative polarity change of current 200 normal work of part, the second by-pass switch
42 closures；When negative polarity change of current part 200 occurs dc-side short-circuit fault, the second by-pass switch 42 is opened, the second current limliting electricity
Device 32 is hindered for suppressing the short circuit current in negative polarity short-circuit loop；When the current value in negative polarity short-circuit loop is reduced to normally
In the range of when, the second by-pass switch 42 is closed.
For the operation principle of current-limiting resistor (including the first current-limiting resistor 31 and the second current-limiting resistor 32), ability
Field technique personnel are should be understood that when current-limiting resistor is series in circuit, to the size for limiting place branch current, in case
Only excessive components and parts burnt out in circuit of electric current.
It should be noted that first, the short trouble degree of the current conversion station DC side is different, the work of the current conversion station
Mode is different.
Example, when positive polarity change of current part 100 occurs dc-side short-circuit fault, the first current-limiting resistor 31 makes short circuit
Current value in loop was reduced in normal range, on this basis, if 100 dc-side short-circuit fault of positive polarity change of current part is not
Can recover, 100 locking of positive polarity change of current part, the current conversion station are carried out one pole fortune by negative polarity change of current part 200 by system
OK；If 100 dc-side short-circuit fault of positive polarity change of current part can recover, just bipolar flexible direct current transmission system is not being affected
Often work.
When negative polarity change of current part 200 occurs dc-side short-circuit fault, during the second current-limiting resistor 32 makes short-circuit loop
Current value be reduced in normal range, on this basis, if 200 dc-side short-circuit fault of negative polarity change of current part can not be extensive
Multiple, 200 locking of negative polarity change of current part, the current conversion station are carried out monopolar operation by positive polarity change of current part 100 by system；If
200 dc-side short-circuit fault of negative polarity change of current part can recover, then do not affect the normal work of bipolar flexible direct current transmission system
Make.
The second, the first inverter 11 and the second inverter 12 include multiple insulated gate bipolar transistor (Insulated
Gate Bipolar Transistor, abbreviation IGBT) converter valve, each IGBT converter valve is made up of several valve modules.
3rd, the first inverter 11 and the second inverter 12 can be used to for alternating current to be converted to unidirectional current, it can also be used to will
Unidirectional current is converted to alternating current.
No matter the first inverter 11 and the second inverter 12 are for being converted to unidirectional current by alternating current, or unidirectional current is turned
The high-pressure side for being changed to alternating current, the high-pressure side of the first inverter 11 and the second inverter 12 is all that connection positive high voltage direct current is defeated respectively
Electric wire and negative high voltage DC transmission line.
4th, the design parameter of the first current-limiting resistor 31 and the second current-limiting resistor 32 can according to its applied it is concrete
Current conversion station is set, as long as ensureing when there is dc-side short-circuit, the phase on inverter and faulty line in current conversion station
Pass equipment is not destroyed.
The embodiment of the present invention provides a kind of current conversion station, by arranging the first current limliting module 21 in positive polarity change of current part 100,
Second current limliting module 22 is set in negative polarity change of current part 200, and makes the first current limliting module 21 include the first current-limiting resistor 31
And first by-pass switch 41 in parallel with the first current-limiting resistor 31, make the second current limliting module 22 include the second current-limiting resistor 32
And second by-pass switch 42 in parallel with the second current-limiting resistor 32, when the positive polarity change of current part 100 or negative of the current conversion station
When polarity change of current part 200 occurs dc-side short-circuit fault, by the by-pass switch for opening the change of current part broken down so that
Short circuit current can flow through the current-limiting resistor of the change of current part broken down, thus can suppress the electric current in short-circuit loop, it is ensured that
The safety of inverter and relevant device on faulty line in current conversion station.On this basis, due to the current conversion station
Operating current it is very big, when the current conversion station normal work, or the current value in short-circuit loop were reduced in normal range
When, by the by-pass switch for closing the change of current part broken down, the first current limliting module 21 and the second current limliting module 22 can be avoided
In each device long-time run under high current and be damaged.
Further, since the first current limliting module 21 and the second current limliting module 22 are independently arranged, can be in the event of the current conversion station
When barrier only occurs in a 200 wherein pole of positive polarity change of current part 100 or negative polarity change of current part, it is ensured that another pole does not occur bright
Aobvious change, i.e. the impact to normal work pole is less.
Preferably, as shown in Fig. 2 the first current limliting module 21 also includes the first spark gap 51, one end of the first spark gap 51
It is connected with the low-pressure end of the first inverter 11, other end ground connection.And/or, the second current limliting module 22 also includes the second spark gap 52,
One end of second spark gap 52 is connected with the low-pressure end of the second inverter 12, other end ground connection.
It should be noted that first, Fig. 2 are so that the first current limliting module 21 and the second current limliting module 22 include spark gap as an example
Illustrated, but the embodiment of the present invention is not limited to this, can only make the first current limliting module 21 include the first spark gap 51, or
The second current limliting module 22 is only made to include the second spark gap 52.
Second, it will be recognized by those skilled in the art that spark gap can reduce the voltage and current in circuit, protect electrical equipment
Harm of the equipment from high transient overvoltage.
In the embodiment of the present invention, by the first spark gap 51 is arranged in the first current limliting module 21, when the current conversion station
There is dc-side short-circuit fault in positive polarity change of current part 100, and take shelter from the thunder when the voltage of 11 low-pressure end of the first inverter rises to first
During the protection voltage level of device 51, the first spark gap 51 works, and makes the portion of electrical current in short-circuit loop pass through the first spark gap 51
The earth is flowed into, so as to reduce the current stress of the first current-limiting resistor 31, it is also possible to reduce by 11 low-pressure end of the first inverter
Overvoltage level, protects inverter and other relevant devices in faulty line too high from electric current and is damaged.By
Second spark gap 52 is set in two current limliting modules 22, when the negative polarity change of current part 200 of the current conversion station occurs dc-side short-circuit
Failure, and when the voltage of 12 low-pressure end of the second inverter rises to the protection voltage level of the second spark gap 52, the second spark gap
52 work, make the portion of electrical current in short-circuit loop flow into the earth by the second spark gap 52, so as to reduce the second current-limiting resistance
The current stress of device 32, while the overvoltage level of 12 low-pressure end of the second inverter can also be reduced, in protection faulty line
Inverter and other relevant devices are too high from electric current and be damaged.
Additionally, relative dc circuit breaker and its relevant device using bigger connecting-disconnecting function, due to high-tension electricity, jumbo
Dc circuit breaker cannot be temporarily directly applied in engineering still in the development stage, and its cost of manufacture is high, therefore was limited
Its practical application in DC engineering；Or, it is relative to adopt traditional restrictor apparatus, but traditional restrictor apparatus exist
Open-circuit line is needed after breaking down, trend distribution and the stability of system is affected；Or it is relative using based on current-carrying isolator
Fast failure demand limiter, do not need open-circuit line, failure to terminate rear electric current and can continue from by-pass switch after breaking down
Circulation, the trend distribution under not affecting system normally to run, but its equipment is complicated, and manufacturing cost is higher.The embodiment of the present invention
As the first current limliting module 21 includes up to the first current-limiting resistor 31, the first by-pass switch 41 and the first spark gap 51, second
Current limliting module 22 includes up to the second current-limiting resistor 32, the second by-pass switch 42 and the second spark gap 52 so that the change of current
The topology stood does not contain high-power electric and electronic switching device, and cost relative moderate, small volume realize simple and excellent performance,
Thus it is easy to practical application popularization.
Preferably, as shown in Fig. 3 (a), the first current-limiting resistor 31 includes at least one first sub- current-limiting resistors 301；
Wherein, when the first current-limiting resistor 31 includes at least two first sub- current-limiting resistors 301, at least two first sub- current limliting electricity
Resistance device 301 is arranged in series and/or parallel；And/or, such as shown in Fig. 3 (b), the second current-limiting resistor 32 includes at least one
Individual second sub- current-limiting resistor 302；Wherein, when the second current-limiting resistor 32 includes at least two second sub- current-limiting resistors 302
When, at least two second sub- current-limiting resistors 302 are arranged in series and/or parallel.
In the embodiment of the present invention, due to compared to the less current-limiting resistor of parameter value, the larger current-limiting resistance of parameter value
Device cost is higher, by least two first sub- current-limiting resistors 301 are arranged in series and/or parallel, will at least two
Individual second sub- current-limiting resistor 302 is arranged in series and/or parallel, can reduce the parameter value needed for current-limiting resistor,
So as to be readily obtained the current-limiting resistor of needs, its advantage of lower cost.
The embodiment of the present invention also provides a kind of current conversion station for bipolar flexible direct current transmission system, as shown in figure 4, including
Positive polarity change of current part 100 and negative polarity change of current part 200；Positive polarity change of current part 100 includes the first inverter 11；Negative polarity
Change of current part 200 includes the second inverter 12；The current conversion station also includes the 3rd current limliting module 23；3rd current limliting module 23 includes
3rd current-limiting resistor 33, the 3rd current-limiting resistor 33 are connected on neutral bus 300；3rd current limliting module 23 also includes and
3rd by-pass switch 43 of three current-limiting resistors, 33 parallel connection.
The operation principle of the 3rd current limliting module 23 is：When positive polarity change of current part 100 and negative polarity change of current part 200 it is normal
During work, the 3rd by-pass switch 43 is closed；When positive polarity change of current part 100 or negative polarity change of current part 200, that DC side occurs is short
During the failure of road, the 3rd by-pass switch 43 is opened, and the 3rd current-limiting resistor 33 is used to suppressing the short circuit current in short-circuit loop；When short
When current reduction in the loop of road is within normal range, the 3rd by-pass switch 43 is closed.
The embodiment of the present invention provides a kind of current conversion station, by arranging the 3rd current limliting module 23 in the current conversion station, and makes the
Three current limliting modules 23 include the 3rd current-limiting resistor 33 and threeth by-pass switch 43 in parallel with the 3rd current-limiting resistor 33, work as institute
When stating the positive polarity change of current part 100 or negative polarity change of current part 200 generation dc-side short-circuit fault of current conversion station, open by the of the 3rd
Way switch 43 so that short circuit current can flow through the 3rd current-limiting resistor 33, thus can suppress the electric current in short-circuit loop, it is ensured that
The safety of the relevant device on inverter and faulty line in current conversion station.On this basis, due to the current conversion station
Operating current is very big, when the current conversion station normal work, or the current value in short-circuit loop were reduced in normal range,
By closing the 3rd by-pass switch 43, it is to avoid in the 3rd current limliting module 23, each device long-time is run under high current and damaged
It is bad.
Preferably, as shown in figure 5, the 3rd current limliting module 23 also includes the 3rd spark gap 53；3rd spark gap 53
One end is connected with neutral bus 300, other end ground connection；Wherein, the 3rd spark gap 53 is arranged on the low-pressure end and the 3rd of inverter
Between current-limiting resistor 33.
Or, it is preferred that as shown in fig. 6, the 3rd current limliting module 23 includes two the 3rd spark gaps 53；One of them the 3rd
One end of spark gap 53 is connected with the low-pressure end of the first inverter 11, other end ground connection；One end of another the 3rd spark gap 53
It is connected with the low-pressure end of the second inverter 12, other end ground connection.
In the embodiment of the present invention, by the 3rd spark gap 53 is arranged in the 3rd current limliting module 23, when the current conversion station
There is dc-side short-circuit fault in positive polarity change of current part 100 or negative polarity change of current part 200, and when the first inverter 11 or the second
When the voltage of 12 low-pressure end of inverter rises to the protection voltage level of the 3rd spark gap 53, the 3rd spark gap 53 works, and makes short circuit
Portion of electrical current in loop flows into the earth by the 3rd spark gap 53, so as to the electric current for reducing the 3rd current-limiting resistor 33 should
Power, while the overvoltage level of 12 low-pressure end of the first inverter 11 or the second inverter can also be reduced, in protection faulty line
Inverter and other relevant devices it is too high from electric current and be damaged.Further, since the 3rd current limliting module 23 includes up to
Three current-limiting resistors 33, the 3rd by-pass switch 43 and the 3rd spark gap 53 so that the topology of the current conversion station does not contain high-power electricity
Power electronic switching device, cost relative moderate, small volume realize simple and excellent performance, it is easy to which practical application is promoted.
Preferably, as shown in fig. 7, the 3rd current-limiting resistor 33 includes at least one the 3rd sub- current-limiting resistors 303；Its
In, when the 3rd current-limiting resistor 33 includes at least two three sub- current-limiting resistors 303, at least two the 3rd sub- current-limiting resistances
Device 303 is arranged in series and/or parallel.
In the embodiment of the present invention, due to compared to the less current-limiting resistor of parameter value, the larger current-limiting resistance of parameter value
Device cost is higher, by least two the 3rd sub- current-limiting resistors 303 are arranged in series and/or parallel, can reduce
Parameter value needed for current-limiting resistor, so as to be readily obtained the current-limiting resistor of needs, its advantage of lower cost.
The embodiment of the present invention also provides a kind of bipolar flexible direct current transmission system, as shown in figure 8, the bipolar flexible direct current
Transmission system includes sending end current conversion station 01 and/or receiving end current conversion station 02；Sending end current conversion station 01 and/or receiving end current conversion station
02 is the current conversion station of aforementioned any embodiment of the invention.
Wherein, sending end current conversion station 01 is for being line by alternating voltage Jing the first inverters 11 and 12 rectification of the second inverter
Road ability to transmit electricity is strong, little DC voltage is lost, and is sent to receiving end current conversion station 02；Receiving end current conversion station 02 is for by first
The DC voltage that inverter 11 and the second inverter 12 are received be converted into can large area transmission of electricity alternating voltage.
Additionally, the bipolar flexible direct current transmission system also includes AC system, converter power transformer and commutating reactor
Deng.
One end of converter power transformer is connected with AC system, the other end pass through commutating reactor and the first inverter 11, the
The exchange end connection of two inverters 12, on the one hand, the connection being capable of achieving between AC network and direct current network；On the other hand, may be used
To realize the conversion of voltage, 01 DC voltage of sending end current conversion station or the AC voltage of receiving end current conversion station 02 is made to meet which
Rated voltage and allowable voltage skew.
One end of commutating reactor is connected with converter power transformer, the other end and the first inverter 11, the second inverter 12
The connection of exchange end.
Based on this, the exchange end of the first inverter 11 and the second inverter 12 can be connected with converter power transformer and commutating reactor
Connect；In sending end current conversion station 01 in the high-pressure side of the first inverter 11 of positive polarity change of current part 100 and receiving end current conversion station 02
The of negative polarity change of current part 200 in the high-pressure side of the first inverter 11 of positive polarity change of current part 100, sending end current conversion station 01
The high-pressure side of two inverters 12 is led to the high-pressure side of the second inverter 12 of negative polarity change of current part 200 in receiving end current conversion station 02
Cross the connection of bipolarity high-voltage dc transmission electric wire.
The embodiment of the present invention is by arranging current limliting module in the current conversion station of the bipolar flexible direct current transmission system, and makes
Current limliting module includes current-limiting resistor and by-pass switch connected in parallel, when the current conversion station positive polarity change of current part 100 or
When negative polarity change of current part 200 occurs dc-side short-circuit fault, by the by-pass switch for opening the change of current part broken down, make
The current-limiting resistor that short circuit current can flow through the change of current part broken down is obtained, thus the electric current in short-circuit loop can be suppressed, protected
The safety of the relevant device on the inverter and faulty line in current conversion station is demonstrate,proved.On this basis, due to the change of current
The operating current stood is very big, when the current conversion station normal work, or the current value in short-circuit loop are reduced to normal range
When interior, by the by-pass switch for closing the change of current part broken down, in can avoiding current limliting module, each device long-time is in big electricity
Flow down operation and be damaged.
Preferably, sending end current conversion station 01 and receiving end current conversion station 02 are the described of aforementioned any embodiment of the invention and change
Stream station.
The embodiment of the present invention makes the sending end current conversion station 01 and receiving end current conversion station 02 of the bipolar flexible transmission system equal
For the current conversion station of aforementioned any embodiment of the invention, it is ensured that when the DC side of the bipolar flexible transmission system breaks down
When being short-circuited, the positive polarity change of current part 100 and negative polarity change of current part of sending end current conversion station 01 and receiving end current conversion station 02
Short circuit current in 200 circuit is suppressed, so as to the components and parts in protection circuit are not damaged by.
The embodiment of the present invention also provides a kind of control method of the such as current conversion station of aforementioned any embodiment of the invention, works as generation
During direct-current short circuit, control by-pass switch is opened；Otherwise, control by-pass switch to close.
It should be noted that the automatic control protecting device in the bipolar flexible direct current transmission system can be according to logic
Judgement sends signal, so as to control the state of by-pass switch.
Additionally, when the positive polarity change of current part 100 in the current conversion station or the event of 200 dc-side short-circuit of negative polarity change of current part
When hindering irrecoverable, it is also possible to just automatically controlled by the automatic control protecting device in the bipolar flexible direct current transmission system
200 locking of polarity change of current part 100 or negative polarity change of current part.
In the embodiment of the present invention, when dc-side short-circuit fault occurs in the current conversion station, by-pass switch is automatically opened up, can be more
Rapidly suppress short-circuit loop in electric current, it is ensured that the peace of the relevant device on inverter and faulty line in current conversion station
Quan Xing.When the current conversion station normal work, or the current value in short-circuit loop were reduced in normal range, closure is other automatically
Way switch, it is to avoid each device long-time is run under high current and is damaged in current limliting module.
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be defined by the scope of the claims.
Claims (10)
1. a kind of current conversion station for bipolar flexible direct current transmission system, it is characterised in that including positive polarity change of current part and negative
Polarity change of current part；The positive polarity change of current part includes the first inverter and the first current limliting module；The negative polarity change of current portion
Dividing includes the second inverter and the second current limliting module；
The first current limliting module includes the first current-limiting resistor, one end of first current-limiting resistor and first change of current
The low-pressure end connection of device, the other end are connected with neutral bus；The first current limliting module also includes and first current-limiting resistance
Device the first by-pass switch in parallel；
The second current limliting module includes the second current-limiting resistor, one end of second current-limiting resistor and second change of current
The low-pressure end connection of device, the other end are connected with neutral bus；The second current limliting module also includes and second current-limiting resistance
Device the second by-pass switch in parallel.
2. current conversion station according to claim 1, it is characterised in that the first current limliting module also includes the first spark gap,
One end of first spark gap is connected with the low-pressure end of first inverter, other end ground connection；And/or,
The second current limliting module also includes the second spark gap, and one end of second spark gap is low with second inverter
Press bond, other end ground connection.
3. current conversion station according to claim 1 and 2, it is characterised in that first current-limiting resistor includes at least one
First sub- current-limiting resistor；Wherein, when first current-limiting resistor includes at least two first sub- current-limiting resistors, at least
Two the first sub- current-limiting resistors are arranged in series and/or parallel；And/or,
Second current-limiting resistor includes at least one second sub- current-limiting resistors；Wherein, when second current-limiting resistor
During including at least two second sub- current-limiting resistors, at least two second sub- current-limiting resistors are set in series and/or parallel
Put.
4. a kind of current conversion station for bipolar flexible direct current transmission system, it is characterised in that including positive polarity change of current part and negative
Polarity change of current part；The positive polarity change of current part includes the first inverter；The negative polarity change of current part includes second change of current
Device；
The current conversion station also includes the 3rd current limliting module；The 3rd current limliting module includes the 3rd current-limiting resistor, the described 3rd
Current-limiting resistor is connected on neutral bus；The 3rd current limliting module also includes in parallel with the 3rd current-limiting resistor
Three by-pass switches.
5. current conversion station according to claim 4, it is characterised in that the 3rd current limliting module is also lightning-arrest including the 3rd
Device；One end of 3rd spark gap is connected with the neutral bus, other end ground connection；Wherein, the 3rd spark gap is arranged
Between the low-pressure end and the 3rd current-limiting resistor of inverter.
6. current conversion station according to claim 4, it is characterised in that the 3rd current limliting module includes that two the 3rd are taken shelter from the thunder
Device；One end of one of them the 3rd spark gap is connected with the low-pressure end of first inverter, other end ground connection；Another
One end of 3rd spark gap is connected with the low-pressure end of second inverter, other end ground connection.
7. current conversion station according to claim 4, it is characterised in that the 3rd current-limiting resistor includes at least one the 3rd
Sub- current-limiting resistor；Wherein, when the 3rd current-limiting resistor includes at least two three sub- current-limiting resistors, at least two
3rd sub- current-limiting resistor is arranged in series and/or parallel.
8. a kind of bipolar flexible direct current transmission system, it is characterised in that including sending end current conversion station and receiving end current conversion station；
The sending end current conversion station and/or the receiving end current conversion station are described in any one of claim 1-3 or claim 4-7
Current conversion station.
9. transmission system according to claim 8, it is characterised in that the sending end current conversion station and the receiving end change of current
Station is the current conversion station.
10. a kind of control method of the current conversion station as described in any one of claim 1-3 or any one of claim 4-7, which is special
Levy and be, including：
When there is direct-current short circuit, control by-pass switch is opened；Otherwise, control by-pass switch to close.
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| CN201611027960.2A CN106532757A (en) | 2016-11-17 | 2016-11-17 | Bipolar flexible direct current transmission system, converter station thereof and control method of converter station |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834491A (en) * | 2017-11-08 | 2018-03-23 | 南方电网科学研究院有限责任公司 | Configuration method of A-type lightning arrester of converter station |
| CN109687498A (en) * | 2018-12-12 | 2019-04-26 | 国网冀北电力有限公司电力科学研究院 | The bipolar parallel running route back brake system and method for converter station |
| CN110829869A (en) * | 2019-10-22 | 2020-02-21 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | MMC charging strategy suitable for mixed direct current |
| CN112531669A (en) * | 2020-11-06 | 2021-03-19 | 中国电力科学研究院有限公司 | Method for constructing receiving end voltage source converter station of hybrid direct current transmission system and converter station |
| CN114421420A (en) * | 2022-02-10 | 2022-04-29 | 华北电力大学（保定） | Resistance-inductance current-limiting type multi-port direct-current circuit breaker suitable for flexible direct-distribution power grid |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0867998A1 (en) * | 1997-03-24 | 1998-09-30 | Asea Brown Boveri Ab | A plant for transmitting electric power |
| CN101944721A (en) * | 2009-07-10 | 2011-01-12 | 国网运行有限公司上海超高压管理处 | Valve fault detection treatment method of high-voltage direct-current transmission system |
| CN102170140A (en) * | 2011-04-21 | 2011-08-31 | 中国电力科学研究院 | Method for starting flexible high-voltage direct-current (HVDC) system of modularized multi-level converter |
| CN103117528A (en) * | 2013-01-17 | 2013-05-22 | 国网智能电网研究院 | Series capacitor type high-voltage direct current breaker and control method thereof |
| CN202997660U (en) * | 2012-12-21 | 2013-06-12 | 山东大学 | Capacitive pre-charging system for modular multi-level matrix converter |
| CN103595025A (en) * | 2013-10-31 | 2014-02-19 | 南方电网科学研究院有限责任公司 | Alternating current side wiring structure of direct current transmission system of power converter and control method thereof |
| CN204030618U (en) * | 2014-05-30 | 2014-12-17 | 贵州电力试验研究院 | A kind of HVDC light system with dc-side short-circuit protection |
| CN104617783A (en) * | 2014-12-29 | 2015-05-13 | 天津大学 | Improved structure of MMC (Modular Multilevel Converter) current converter with direct-current fault current-limiting capacity and isolating method |
| CN104767194A (en) * | 2015-04-16 | 2015-07-08 | 河南行知专利服务有限公司 | High-voltage transmission convertor station overvoltage protection device |
| CN206211547U (en) * | 2016-11-17 | 2017-05-31 | 南方电网科学研究院有限责任公司 | Bipolar flexible direct current transmission system and converter station thereof |
-
2016
- 2016-11-17 CN CN201611027960.2A patent/CN106532757A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0867998A1 (en) * | 1997-03-24 | 1998-09-30 | Asea Brown Boveri Ab | A plant for transmitting electric power |
| CN101944721A (en) * | 2009-07-10 | 2011-01-12 | 国网运行有限公司上海超高压管理处 | Valve fault detection treatment method of high-voltage direct-current transmission system |
| CN102170140A (en) * | 2011-04-21 | 2011-08-31 | 中国电力科学研究院 | Method for starting flexible high-voltage direct-current (HVDC) system of modularized multi-level converter |
| CN202997660U (en) * | 2012-12-21 | 2013-06-12 | 山东大学 | Capacitive pre-charging system for modular multi-level matrix converter |
| CN103117528A (en) * | 2013-01-17 | 2013-05-22 | 国网智能电网研究院 | Series capacitor type high-voltage direct current breaker and control method thereof |
| CN103595025A (en) * | 2013-10-31 | 2014-02-19 | 南方电网科学研究院有限责任公司 | Alternating current side wiring structure of direct current transmission system of power converter and control method thereof |
| CN204030618U (en) * | 2014-05-30 | 2014-12-17 | 贵州电力试验研究院 | A kind of HVDC light system with dc-side short-circuit protection |
| CN104617783A (en) * | 2014-12-29 | 2015-05-13 | 天津大学 | Improved structure of MMC (Modular Multilevel Converter) current converter with direct-current fault current-limiting capacity and isolating method |
| CN104767194A (en) * | 2015-04-16 | 2015-07-08 | 河南行知专利服务有限公司 | High-voltage transmission convertor station overvoltage protection device |
| CN206211547U (en) * | 2016-11-17 | 2017-05-31 | 南方电网科学研究院有限责任公司 | Bipolar flexible direct current transmission system and converter station thereof |
Non-Patent Citations (1)
| Title |
|---|
| 吴方劼 等: "舟山多端柔性直流输电工程主接线方案设计" * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834491A (en) * | 2017-11-08 | 2018-03-23 | 南方电网科学研究院有限责任公司 | Configuration method of A-type lightning arrester of converter station |
| CN109687498A (en) * | 2018-12-12 | 2019-04-26 | 国网冀北电力有限公司电力科学研究院 | The bipolar parallel running route back brake system and method for converter station |
| CN109687498B (en) * | 2018-12-12 | 2021-03-02 | 国网冀北电力有限公司电力科学研究院 | Bipolar parallel operation line switching system and method for converter station |
| CN110829869A (en) * | 2019-10-22 | 2020-02-21 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | MMC charging strategy suitable for mixed direct current |
| CN110829869B (en) * | 2019-10-22 | 2020-11-24 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | MMC charging strategy suitable for mixed direct current |
| CN112531669A (en) * | 2020-11-06 | 2021-03-19 | 中国电力科学研究院有限公司 | Method for constructing receiving end voltage source converter station of hybrid direct current transmission system and converter station |
| CN112531669B (en) * | 2020-11-06 | 2023-08-18 | 中国电力科学研究院有限公司 | Method for constructing receiving end voltage source converter station of hybrid direct current transmission system and converter station |
| CN114421420A (en) * | 2022-02-10 | 2022-04-29 | 华北电力大学（保定） | Resistance-inductance current-limiting type multi-port direct-current circuit breaker suitable for flexible direct-distribution power grid |
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