CN109193740A - Direct current change-over switch circuit based on converter station and direct current transmission system - Google Patents
Direct current change-over switch circuit based on converter station and direct current transmission system Download PDFInfo
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- CN109193740A CN109193740A CN201811168213.XA CN201811168213A CN109193740A CN 109193740 A CN109193740 A CN 109193740A CN 201811168213 A CN201811168213 A CN 201811168213A CN 109193740 A CN109193740 A CN 109193740A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 66
- 239000002184 metal Substances 0.000 claims abstract description 27
- 229910052751 metal Inorganic materials 0.000 claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims description 146
- 230000010355 oscillation Effects 0.000 claims description 38
- 230000007935 neutral effect Effects 0.000 claims description 14
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 239000010931 gold Substances 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 description 30
- 230000005404 monopole Effects 0.000 description 20
- 238000010586 diagram Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 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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- 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)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a direct current transfer switch circuit and a direct current transmission system based on a converter station, wherein the direct current transfer switch circuit comprises a first direct current transfer switch branch and a second direct current transfer switch branch, and when the direct current transmission system transfers a metal loop to a ground loop, a first current limiting resistor and a first bypass switch are arranged on the first direct current transfer switch branch; when the direct current transmission system is in a metal loop to earth loop, a second current limiting resistor and a second bypass switch are arranged on the second direct current change-over switch branch circuit; the energy absorbed by the lightning arrester in the change-over switch can be effectively reduced, so that the direct current transmission system can be more smoothly changed from the ground loop to the metal loop or from the metal loop to the ground loop.
Description
Technical field
The present invention relates to technical field of direct current power transmission more particularly to a kind of direct current conversion switch circuit based on converter station with
DC transmission system.
Background technique
In DC transmission system, for the conversion for realizing monopole the earth operation and the monopole metal method of operation, gold need to be set
Belong to loop line change-over switch MRTB (metallic return transfer breaker) and Ground return change-over switch ERTB
(earth return transfer breaker).Metallic return change-over switch MRTB is installed in earthing pole line loop, not
In the case where stoppage in transit, DC current is transformed into monopolar metallic return from monopolar ground return and (disconnects direct current in Ground return
Stream), to guarantee whether conversion process interrupts the conveying of dc power.Ground return change-over switch ERTB be installed in ground connection polar curve and
Between polar curve, in the case where not stopping transport, DC current is transformed into monopolar ground return from monopolar metallic return and (disconnects metal
DC current in loop line).
In two-terminal direct current transmission system, MRTB and ERTB is arranged at least one general converter station.In multi-terminal HVDC transmission
In system, multiple converter station setting MRTB and ERTB are generally had.In large capacity HVDC transmission system, metallic return turns
The oscillation circuit and arrester changed in switch absorbs that energy is larger, and arrester absorbs energy requirement up to tens when high power conversion
MJ, generally uses multicolumn parallel-connection structure, and parallel connection outside and the total column number of internal parallel can be up to tens to several hundred columns, but to arrester
The mass of the valve plate control and intercolumniation shunt uniformity and propose high requirement, and multicolumn lightning arrester connected in parallel is easily sent out in direct current conversion
Raw surge arrester failure leads to method of operation convert failed, and then may cause direct current stoppage in transit, and current domestic multiple DC engineerings are all
Once because direct current change-over switch multicolumn lightning arrester connected in parallel failure caused method of operation convert failed.Further, since arrester column number
Numerous, arrester land occupation is larger, and cost is also higher.
DC transmission system turns metal in progress the earth or metal turns in the earth conversion process, when direct current switching current is got over
When big, arrester absorption energy is bigger, is more unfavorable for system and smoothly converts, and when direct current switching current is smaller, arrester absorbs
Energy is smaller, is more conducive to system and smoothly converts.Therefore in order to allow system to turn metal or metal to turn the earth converted carrying out the earth
It in journey more smoothly, can be reduction direct current switching current so that lightning-arrest to improve by way of reducing the energy that arrester absorbs
Device service condition and system switch condition, although the side of transmission power when can be converted by reduction system in prior art
Formula realizes the effect that direct current switching current reduces, but this kind of mode can reduce the availability of DC transmission system and increase direct current
The power loss of transmission system can not veritably solve DC transmission system in high-power operating status and carry out ground return circuit turn gold
When belonging to circuit or metallic(return) circuit and turning ground return circuit, it is excessive that arrester absorbs energy, cause arrester be easy to happen failure this
Problem.
Summary of the invention
The object of the present invention is to provide a kind of direct current conversion switch circuit based on converter station, when DC transmission system into
Row ground return circuit turns metallic(return) circuit or when metallic(return) circuit turns ground return circuit, can be effectively reduced arrester in change-over switch and inhale
The energy of receipts keeps DC transmission system more suitable when progress ground return circuit turns metallic(return) circuit or metallic(return) circuit turns ground return circuit
Benefit.
In order to solve the above technical problems, the embodiment of the invention provides a kind of, and the direct current change-over switch based on converter station is electric
Road, the direct current conversion switch circuit include: the first direct current change-over switch branch and the first Ground return conversion switch circuit；Its
In, the input terminal of the first direct current change-over switch branch passes through neutral bus and the first Ground return conversion switch circuit
Input terminal connection, the output end of the first direct current change-over switch branch is connected with ground connection polar curve, first the earth time
The output end of line conversion switch circuit is connected with metallic return；The first direct current change-over switch branch is returned including the first metal
Line conversion switch circuit, the first current-limiting resistance and the first by-pass switch；Wherein, the first metallic return conversion switch circuit
Input terminal is connected with the input terminal of the first direct current change-over switch branch, the first metallic return conversion switch circuit
Output end is connected with the first end of first current-limiting resistance, the second end of first current-limiting resistance and first direct current
The output end of change-over switch branch is connected, the first end of the first end of first by-pass switch and first current-limiting resistance
It is connected, the second end of first by-pass switch is connected with the second end of first current-limiting resistance.
Preferably, first by-pass switch is disconnecting switch.
Preferably, first by-pass switch is breaker.
Preferably, the first metallic return conversion switch circuit include the first change-over switch, the first LC oscillation circuit and
First arrester；Wherein, the input of the first end of first change-over switch and the first metallic return conversion switch circuit
End is connected, and the second end of first change-over switch is connected with the output end of the first metallic return conversion switch circuit
It connects, the input terminal of the first LC oscillation circuit is connected with the first end of first change-over switch, the first LC oscillation
The output end in circuit is connected with the second end of first change-over switch, the first end of first arrester and described first
The first end of change-over switch is connected, and the second end of first arrester is connected with the second end of first change-over switch
It connects.
Preferably, the first Ground return conversion switch circuit include the second change-over switch, the 2nd LC oscillation circuit and
Second arrester；Wherein, the input of the first end of second change-over switch and the first Ground return conversion switch circuit
End is connected, and the second end of second change-over switch is connected with the output end of the first Ground return conversion switch circuit
It connects, the input terminal of the 2nd LC oscillation circuit is connected with the first end of second change-over switch, the 2nd LC oscillation
The output end in circuit is connected with the second end of second change-over switch, the first end of second arrester and described second
The first end of change-over switch is connected, and the second end of second arrester is connected with the second end of second change-over switch
It connects.
The embodiment of the invention also provides a kind of direct current conversion switch circuit based on converter station, the direct current change-over switch
Circuit includes: the second direct current change-over switch branch and the second metallic return conversion switch circuit；Wherein, the second direct current conversion
The input terminal of switching branches is connect by neutral bus with the input terminal of the second metallic return conversion switch circuit, and described the
The output end of two direct current change-over switch branches is connected with metallic return, the output of the second metallic return conversion switch circuit
End is connected with ground connection polar curve；The second direct current change-over switch branch includes the second Ground return conversion switch circuit, second
Current-limiting resistance and the second by-pass switch；Wherein, the input terminal of the second Ground return conversion switch circuit and described second straight
The input terminal that switching branches are changed in circulation is connected, the output end of the second Ground return conversion switch circuit and second limit
The first end of leakage resistance is connected, the output of the second end of second current-limiting resistance and the second direct current change-over switch branch
End is connected, and the first end of second by-pass switch is connected with the first end of second current-limiting resistance, by the of described second
The second end of way switch is connected with the second end of second current-limiting resistance.
Preferably, the second Ground return conversion switch circuit include third change-over switch, the 3rd LC oscillation circuit and
Third arrester；Wherein, the input of the first end of the third change-over switch and the second Ground return conversion switch circuit
End is connected, and the second end of the third change-over switch is connected with the output end of the second Ground return conversion switch circuit
It connects, the input terminal of the 3rd LC oscillation circuit is connected with the first end of the third change-over switch, the 3rd LC oscillation
The output end in circuit is connected with the second end of the third change-over switch, the first end and the third of the third arrester
The first end of change-over switch is connected, and the second end of the third arrester is connected with the second end of the third change-over switch
It connects.
Preferably, the second metallic return conversion switch circuit include the 4th change-over switch, the 4th LC oscillation circuit and
4th arrester；Wherein, the input of the first end of the 4th change-over switch and the second metallic return conversion switch circuit
End is connected, and the second end of the 4th change-over switch is connected with the output end of the second metallic return conversion switch circuit
It connects, the input terminal of the 4th LC oscillation circuit is connected with the first end of the 4th change-over switch, the 4th LC oscillation
The output end in circuit is connected with the second end of the 4th change-over switch, the first end and the described 4th of the 4th arrester
The first end of change-over switch is connected, and the second end of the 4th arrester is connected with the second end of the 4th change-over switch
It connects.
The embodiment of the invention also provides a kind of DC transmission system, the DC transmission system include the first converter station,
Second converter station and DC line；Wherein, first converter station includes that the described in any item direct currents of Claims 1-4 such as turn
Change switching circuit；The direct current conversion switch circuit includes the first direct current change-over switch branch and the first Ground return change-over switch
Circuit；Wherein, the input terminal of the first direct current change-over switch branch is converted by neutral bus and first Ground return
The input terminal of switching circuit connects, and the output end of the first direct current change-over switch branch is connected with polar curve is grounded, and described the
The output end of one Ground return conversion switch circuit is connected with metallic return；First converter station passes through DC line and institute
State the connection of the second converter station.
The embodiment of the invention also provides a kind of DC transmission system, the DC transmission system include third converter station,
4th converter station and DC line；Wherein, the third converter station includes that the described in any item direct currents of claim 5 to 8 such as turn
Change switching circuit；The direct current conversion switch circuit includes the second direct current change-over switch branch and the second metallic return change-over switch
Circuit；Wherein, the input terminal of the second direct current change-over switch branch is converted by neutral bus and second metallic return
The input terminal of switching circuit connects, and the output end of the second direct current change-over switch branch is connected with metallic return, and described the
The output end of two metallic return conversion switch circuits is connected with ground connection polar curve；The third converter station passes through DC line and institute
State the connection of the 4th converter station.
Compared with the existing technology, a kind of direct current conversion switch circuit based on converter station provided in an embodiment of the present invention has
Beneficial effect is: when DC transmission system is when progress ground return circuit turns metallic(return) circuit, by opening in first direct current conversion
It closes branch and the first current-limiting resistance and the first by-pass switch is set；When DC transmission system turns ground return circuit in progress metallic(return) circuit
When, by the way that the second current-limiting resistance and the second by-pass switch is arranged in the second direct current change-over switch branch；It can effectively drop
The energy that arrester absorbs in low change-over switch makes DC transmission system turn metallic(return) circuit or metal time in progress ground return circuit
Road turns more smooth when ground return circuit.
Detailed description of the invention
Fig. 1 is that a kind of structure of DC transmission system when carrying out ground return circuit and turning metallic(return) circuit is shown in the embodiment of the present invention
It is intended to；
Fig. 2 is the structural schematic diagram of the first direct current change-over switch branch in the embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of first metallic return conversion switch circuit in the embodiment of the present invention；
Fig. 4 is that arrester absorbs when the first direct current change-over switch branch is added without the first current-limiting resistance in the embodiment of the present invention
Energy, Ground return electric current and metallic return electric current variation schematic diagram；
Fig. 5 be in the embodiment of the present invention the first direct current change-over switch branch be added the first current-limiting resistance resistance value be 10 Ω when
The variation schematic diagram of energy, Ground return electric current and metallic return electric current that arrester absorbs；
Fig. 6 be in the embodiment of the present invention the first direct current change-over switch branch be added the first current-limiting resistance resistance value be 20 Ω when
The variation schematic diagram of energy, Ground return electric current and metallic return electric current that arrester absorbs；
Fig. 7 is that a kind of structure of DC transmission system when carrying out metallic(return) circuit and turning ground return circuit is shown in the embodiment of the present invention
It is intended to.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, it, which is a kind of DC transmission system provided in an embodiment of the present invention, turns metal carrying out ground return circuit
Structural schematic diagram when circuit, the DC transmission system include the first converter station 1, the second converter station 2 and DC line；Its
In, first converter station 1 includes direct current conversion switch circuit 3, and the direct current conversion switch circuit 3 is converted including the first direct current
Switching branches 4 and the first Ground return conversion switch circuit 5；Wherein, the input terminal of the first direct current change-over switch branch 4 is logical
It crosses neutral bus to connect with the input terminal of the first Ground return conversion switch circuit 5, the first direct current change-over switch branch
The output end on road 4 is connected with ground connection polar curve, the output end and metallic return phase of the first Ground return conversion switch circuit 5
Connection；First converter station 1 is connect by DC line with second converter station 2.
In the present embodiment, the DC transmission system be two-terminal direct current transmission system or multi-terminal direct current transmission system or
Person's flexible HVDC transmission system, wherein the first metallic return is arranged at least one converter station of the two-terminal direct current transmission system
Conversion switch circuit 41 and the first Ground return conversion switch circuit, and the multi-terminal direct current transmission system has multiple converter stations
First metallic return conversion switch circuit 41 and the first Ground return conversion switch circuit are set；Wherein, KN11、KN12、KN21With
KN22For neutral line isolation switch；K11、K12、K21And K22It is real for connecting the polar curve of the neutral conductor and operation of converter station extremely to pole
The existing monopolar metallic return method of operation；RPFor direct-current polar resistance；RERAnd REIThe respectively ground connection polar curve of rectification side and inverter side
Road resistance；LPFor direct-current polar inductance；LERAnd LEIThe respectively ground electrode circuit inductance of rectification side and inverter side.
Referring to Fig. 2, in an alternative embodiment, the first direct current change-over switch branch 4 includes the first metal
Loop line conversion switch circuit 41, the first current-limiting resistance 42 and the first by-pass switch 43；Wherein, the first metallic return conversion is opened
The input terminal on powered-down road 41 is connected with the input terminal of the first direct current change-over switch branch 4, and first metallic return turns
The output end for changing switching circuit 41 is connected with the first end of first current-limiting resistance 42, and the of first current-limiting resistance 42
Two ends are connected with the output end of the first direct current change-over switch branch 4, the first end of first by-pass switch 43 and institute
The first end for stating the first current-limiting resistance 42 is connected, the second end of first by-pass switch 43 and first current-limiting resistance 42
Second end be connected.
In the present embodiment, by the way that the first current-limiting resistance 42 and first is arranged in the first direct current change-over switch branch 4
By-pass switch 43 puts into first direct current and turns when the monopole the earth method of operation is converted to monopole metal method of operation process
Switching branches 4 are changed, the direct current switching current that can be effectively reduced in DC transmission system is opened to reduce the conversion of the first metal
The energy that the first arrester 413 in powered-down road 41 absorbs makes DC transmission system when progress ground return circuit turns metallic(return) circuit
More smoothly；Wherein, the first metallic return conversion switch circuit 41 can be passive metallic return conversion switch circuit
Or active type metallic return conversion switch circuit.
By taking the pole 1 in the DC transmission system is run as an example, the monopole the earth method of operation in DC transmission system is turned
The process for being changed to the monopole metal method of operation is illustrated, the specific steps are as follows:
When the monopole the earth method of operation is converted to monopole metal method of operation process, puts into the first direct current conversion and open
Branch 4 is closed, at this time KN11And KN12In closed state, KN21And KN22It is in an off state；
Firstly, the first metallic return conversion switch circuit 41 is made to be in closed state, first Ground return turns
It changes switching circuit to be in an off state, the first by-pass switch KR43 are in closed state, K11、K12、K21And K22In disconnection
State；The DC current of the DC transmission system flows only through Ground return at this time；
Then, the first metallic return conversion switch circuit 41 is made to be in closed state, first Ground return turns
It changes switching circuit and is in closed state, the first by-pass switch KR43 are in closed state, K12And K22In closed state,
K11And K21It is in an off state；The DC current of the DC transmission system is returned in Ground return and metallic return two at this time
It is shunted in road；It is then turned off the first by-pass switch KR43, the first current-limiting resistance 42 is put into, the described of Ground return is flowed through
The DC current of DC transmission system further decreases；
It is then turned off the first metallic return conversion switch circuit 41, makes the DC transmission system in Ground return
DC current be transferred to metallic return circuit；
After the first metallic return conversion switch circuit 41 disconnects, ground electrode circuit loop current is zero, described in closure
First by-pass switch KR43 bypass first current-limiting resistance 42.
Wherein, when the progress monopole the earth method of operation is converted to monopole metal method of operation process, first metal
Direct current switching current I in loop line conversion switch circuit 41MRTBNot only with it is straight in monopole ground return circuit and monopole metallic loop
Flow polar curve resistance Rp, ground electrode circuit resistance RER、REIEtc. intrinsic parameter size is related in systems, also put into in conversion process
First current-limiting resistance 42 is related, and first current-limiting resistance 42 is used to adjust the size of direct current switching current；According to formulaCalculate I after putting into first current-limiting resistance 42MRTBValue；Wherein, IdFor the DC power transmission system
The DC current of system；When not putting into first current-limiting resistance 42, direct current switching current is according to formula
It is calculated, it can be seen that, the direct current switching current IMRTBBy direct-current polar resistance Rp, ground electrode circuit resistance RERAnd REISystem
Intrinsic parameter in system determines, can not reasonably be adjusted, therefore can realize adjustment by putting into first current-limiting resistance 42
The function of direct current switching current size.
In an alternative embodiment, first by-pass switch 43 is disconnecting switch.Wherein, the disconnecting switch knot
Structure is simple, it is at low cost and also have stronger resistance to arcing ability.
In an alternative embodiment, first by-pass switch 43 is breaker.Wherein, the breaker is arc resistance
Higher breaker or vacuum circuit breaker.
First current-limiting resistance 42 is used to adjust the direct current switching current in the DC transmission system.
Referring to Fig. 3, in an alternative embodiment, the first metallic return conversion switch circuit 41 includes first
Change-over switch 411, the first LC oscillation circuit 412 and the first arrester 413；Wherein, the first end of first change-over switch 411
Be connected with the input terminal of the first metallic return conversion switch circuit 41, the second end of first change-over switch 411 with
The output end of the first metallic return conversion switch circuit 41 is connected, the input terminal of the first LC oscillation circuit 412 with
The first end of first change-over switch 411 is connected, the output end of the first LC oscillation circuit 412 and first conversion
The second end of switch 411 is connected, the first end of the first end of first arrester 413 and first change-over switch 411
It is connected, the second end of first arrester 413 is connected with the second end of first change-over switch 411.
In the present embodiment, first change-over switch 411 is transformed by AC circuit breaker；The first LC oscillation
The setting in circuit 412 is to form current zero-crossing point in circuit to allow；And first arrester is metal oxide, for inhaling
Receive the energy stored in DC loop.
In an alternative embodiment, the first Ground return conversion switch circuit includes the second change-over switch, the
Two LC oscillation circuits and the second arrester；Wherein, the first end of second change-over switch and first Ground return are converted
The input terminal of switching circuit is connected, the second end of second change-over switch and the first Ground return conversion switch circuit
Output end be connected, the input terminal of the 2nd LC oscillation circuit is connected with the first end of second change-over switch, institute
The output end for stating the 2nd LC oscillation circuit is connected with the second end of second change-over switch, and the first of second arrester
End is connected with the first end of second change-over switch, the second end of second arrester and second change-over switch
Second end is connected.
Wherein, the first Ground return conversion switch circuit can for passive Ground return conversion switch circuit or
Active type Ground return conversion switch circuit.
Fig. 4, Fig. 5 and Fig. 6 are please referred to, in an alternative embodiment, monopole the earth is carried out to DC transmission system and is transported
Energy, Ground return electric current and the metallic return electric current that arrester absorbs when line mode is converted to the monopole metal method of operation carry out
Analysis；Fig. 4 is the energy that arrester absorbs when the first direct current change-over switch branch 4 is added without the first current-limiting resistance 42, the earth time
The variation schematic diagram of line current and metallic return electric current；Fig. 5 is that the first current-limiting resistance 42 is added in the first direct current change-over switch branch 4
Resistance value be 10 Ω when arrester absorb energy, Ground return electric current and metallic return electric current variation schematic diagram；Fig. 6 is
Circulation always changes switching branches 4 and energy, the Ground return that arrester absorbs when the resistance value of the first current-limiting resistance 42 is 20 Ω is added
The variation schematic diagram of electric current and metallic return electric current.It can analyze and obtain from figure, after putting into the first current-limiting resistance 42, i.e., first
The resistance value of current-limiting resistance 42 from 0 to 10 Ω again to 20 Ω when, with before converting, Ground return loop current is reduced to from 2.8kA
1.8kA arrives 1.4kA again, the energy that first arrester 413 in the first metallic return conversion switch circuit 41 absorbs
It substantially reduces, is reduced to 6.6MJ from 16MJ and drops to 3.5MJ again；It can be seen that the energy that first arrester 413 absorbs
With Ground return loop current before conversion close to quadratic relationship, Ground return loop current is down to original half, institute before converting
The energy for stating the absorption of the first arrester 413 will drop to about original a quarter.It can be seen that by setting current-limiting resistance, it can be with
The energy that the direct current switching current and arrester being effectively reduced in the DC transmission system absorb, makes DC transmission system
It is more smooth when carrying out circuit conversion.
Referring to Fig. 7, it is that a kind of DC transmission system provided in an embodiment of the present invention is carrying out metallic(return) circuit turn the earth
Structural schematic diagram when circuit, the DC transmission system include third converter station 6, the 4th converter station 7 and DC line；Its
In, the third converter station 6 includes direct current conversion switch circuit 8；The direct current conversion switch circuit 8 is converted including the second direct current
Switching branches 9 and the second metallic return conversion switch circuit 10；Wherein, the input terminal of the second direct current change-over switch branch 9
It is connect by neutral bus with the input terminal of the second metallic return conversion switch circuit 10, the second direct current change-over switch
The output end of branch 9 is connected with metallic return, the output end and earthing pole of the second metallic return conversion switch circuit 10
Line is connected；The third converter station 6 is connect by DC line with the 4th converter station 7.
In the present embodiment, the DC transmission system be two-terminal direct current transmission system or multi-terminal direct current transmission system or
Person's flexible HVDC transmission system, wherein the second metallic return is arranged at least one converter station of the two-terminal direct current transmission system
Conversion switch circuit 10 and the second Ground return conversion switch circuit, and the multi-terminal direct current transmission system has multiple converter stations
Second metallic return conversion switch circuit 10 and the second Ground return conversion switch circuit are set；Wherein, KN11、KN12、KN21With
KN22For neutral line isolation switch；K11、K12、K21And K22It is real for connecting the polar curve of the neutral conductor and operation of converter station extremely to pole
The existing monopolar metallic return method of operation；RPFor direct-current polar resistance；RERAnd REIThe respectively ground connection polar curve of rectification side and inverter side
Road resistance；LPFor direct-current polar inductance；LERAnd LEIThe respectively ground electrode circuit inductance of rectification side and inverter side.
In an alternative embodiment, the second direct current change-over switch branch 9 includes that the conversion of the second Ground return is opened
Powered-down road, the second current-limiting resistance and the second by-pass switch；Wherein, the input terminal of the second Ground return conversion switch circuit with
The input terminal of the second direct current change-over switch branch is connected, the output end of the second Ground return conversion switch circuit with
The first end of second current-limiting resistance is connected, the second end of second current-limiting resistance and the second direct current change-over switch
The output end of branch is connected, and the first end of second by-pass switch is connected with the first end of second current-limiting resistance,
The second end of second by-pass switch is connected with the second end of second current-limiting resistance.
In the present embodiment, by being arranged by the second current-limiting resistance and second in the second direct current change-over switch branch 9
Way switch puts into the second direct current conversion and opens when the monopole metal method of operation is converted to monopole the earth method of operation process
Branch, the direct current switching current that can be effectively reduced in DC transmission system are closed, to reduce the second the earth change-over switch electricity
The energy that the second arrester in road absorbs keeps DC transmission system more smooth when carrying out metallic(return) circuit and turning ground return circuit；
Wherein, the second Ground return conversion switch circuit can be big for passive Ground return conversion switch circuit or active type
Earthed return conversion switch circuit.
The present embodiment monopole metal method of operation in DC transmission system is converted to the work of the monopole the earth method of operation
Principle and process can refer to the monopole the earth method of operation in above-mentioned DC transmission system and be converted to retouching for the monopole metal method of operation
It states, details are not described herein.
In an alternative embodiment, the second Ground return conversion switch circuit includes third change-over switch,
Three LC oscillation circuits and third arrester；Wherein, the first end of the third change-over switch and second Ground return are converted
The input terminal of switching circuit is connected, the second end of the third change-over switch and the second Ground return conversion switch circuit
Output end be connected, the input terminal of the 3rd LC oscillation circuit is connected with the first end of the third change-over switch, institute
The output end for stating the 3rd LC oscillation circuit is connected with the second end of the third change-over switch, and the first of the third arrester
End is connected with the first end of the third change-over switch, the second end of the third arrester and the third change-over switch
Second end is connected.
In the present embodiment, the third change-over switch is transformed by AC circuit breaker；3rd LC vibrates back
The setting on road is to form current zero-crossing point in circuit to allow；And the third arrester is metal oxide, it is straight for absorbing
Flow back to the energy stored in road.
In an alternative embodiment, the second metallic return conversion switch circuit 10 include the 4th change-over switch,
4th LC oscillation circuit and the 4th arrester；Wherein, the first end of the 4th change-over switch and second metallic return turn
The input terminal for changing switching circuit is connected, the second end of the 4th change-over switch and the second metallic return change-over switch electricity
The output end on road is connected, and the input terminal of the 4th LC oscillation circuit is connected with the first end of the 4th change-over switch,
The output end of the 4th LC oscillation circuit is connected with the second end of the 4th change-over switch, and the of the 4th arrester
One end is connected with the first end of the 4th change-over switch, the second end of the 4th arrester and the 4th change-over switch
Second end be connected.
Wherein, the second metallic return conversion switch circuit 10 can for passive metallic return conversion switch circuit or
Person's active type metallic return conversion switch circuit.
Compared with the existing technology, a kind of direct current conversion switch circuit based on converter station provided in an embodiment of the present invention has
Beneficial effect is: when DC transmission system is when progress ground return circuit turns metallic(return) circuit, by opening in first direct current conversion
It closes branch and the first current-limiting resistance and the first by-pass switch is set；When DC transmission system turns ground return circuit in progress metallic(return) circuit
When, by the way that the second current-limiting resistance and the second by-pass switch is arranged in the second direct current change-over switch branch；It can effectively drop
The energy that arrester absorbs in low change-over switch makes DC transmission system turn metallic(return) circuit or metal time in progress ground return circuit
Road turns more smooth when ground return circuit.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (10)
1. a kind of direct current conversion switch circuit based on converter station characterized by comprising the first direct current change-over switch branch and
First Ground return conversion switch circuit；Wherein, the input terminal of the first direct current change-over switch branch by neutral bus with
The input terminal of the first Ground return conversion switch circuit connects, the output end of the first direct current change-over switch branch with connect
Ground polar curve is connected, and the output end of the first Ground return conversion switch circuit is connected with metallic return；Described first is straight
It includes the first metallic return conversion switch circuit, the first current-limiting resistance and the first by-pass switch that switching branches are changed in circulation；Wherein, institute
The input terminal for stating the first metallic return conversion switch circuit is connected with the input terminal of the first direct current change-over switch branch, institute
The output end for stating the first metallic return conversion switch circuit is connected with the first end of first current-limiting resistance, first limit
The second end of leakage resistance is connected with the output end of the first direct current change-over switch branch, and the first of first by-pass switch
End is connected with the first end of first current-limiting resistance, the second end of first by-pass switch and first current-limiting resistance
Second end be connected.
2. the direct current conversion switch circuit based on converter station as described in claim 1, which is characterized in that first bypass is opened
Closing is disconnecting switch.
3. the direct current conversion switch circuit based on converter station as described in claim 1, which is characterized in that first bypass is opened
Closing is breaker.
4. the direct current conversion switch circuit based on converter station as described in claim 1, which is characterized in that first metal returns
Line conversion switch circuit includes the first change-over switch, the first LC oscillation circuit and the first arrester；Wherein, first conversion is opened
The first end of pass is connected with the input terminal of the first metallic return conversion switch circuit, and the second of first change-over switch
End is connected with the output end of the first metallic return conversion switch circuit, the input terminal of the first LC oscillation circuit and institute
The first end for stating the first change-over switch is connected, and the of the output end of the first LC oscillation circuit and first change-over switch
Two ends are connected, and the first end of first arrester is connected with the first end of first change-over switch, and described first keeps away
The second end of thunder device is connected with the second end of first change-over switch.
5. the direct current conversion switch circuit based on converter station as described in claim 1, which is characterized in that first the earth returns
Line conversion switch circuit includes the second change-over switch, the 2nd LC oscillation circuit and the second arrester；Wherein, second conversion is opened
The first end of pass is connected with the input terminal of the first Ground return conversion switch circuit, and the second of second change-over switch
End is connected with the output end of the first Ground return conversion switch circuit, the input terminal of the 2nd LC oscillation circuit and institute
The first end for stating the second change-over switch is connected, and the of the output end of the 2nd LC oscillation circuit and second change-over switch
Two ends are connected, and the first end of second arrester is connected with the first end of second change-over switch, and described second keeps away
The second end of thunder device is connected with the second end of second change-over switch.
6. a kind of direct current conversion switch circuit based on converter station characterized by comprising the second direct current change-over switch branch and
Second metallic return conversion switch circuit；Wherein, the input terminal of the second direct current change-over switch branch by neutral bus with
The input terminal of the second metallic return conversion switch circuit connects, the output end and gold of the second direct current change-over switch branch
Belong to loop line to be connected, the output end of the second metallic return conversion switch circuit is connected with ground connection polar curve；Described second is straight
It includes the second Ground return conversion switch circuit, the second current-limiting resistance and the second by-pass switch that switching branches are changed in circulation；Wherein, institute
The input terminal for stating the second Ground return conversion switch circuit is connected with the input terminal of the second direct current change-over switch branch, institute
The output end for stating the second Ground return conversion switch circuit is connected with the first end of second current-limiting resistance, second limit
The second end of leakage resistance is connected with the output end of the second direct current change-over switch branch, and the first of second by-pass switch
End is connected with the first end of second current-limiting resistance, the second end of second by-pass switch and second current-limiting resistance
Second end be connected.
7. the direct current conversion switch circuit based on converter station as claimed in claim 6, which is characterized in that second the earth returns
Line conversion switch circuit includes third change-over switch, the 3rd LC oscillation circuit and third arrester；Wherein, the third conversion is opened
The first end of pass is connected with the input terminal of the second Ground return conversion switch circuit, and the second of the third change-over switch
End is connected with the output end of the second Ground return conversion switch circuit, the input terminal of the 3rd LC oscillation circuit and institute
The first end for stating third change-over switch is connected, and the of the output end of the 3rd LC oscillation circuit and the third change-over switch
Two ends are connected, and the first end of the third arrester is connected with the first end of the third change-over switch, and the third is kept away
The second end of thunder device is connected with the second end of the third change-over switch.
8. the direct current conversion switch circuit based on converter station as claimed in claim 6, which is characterized in that second metal returns
Line conversion switch circuit includes the 4th change-over switch, the 4th LC oscillation circuit and the 4th arrester；Wherein, the 4th conversion is opened
The first end of pass is connected with the input terminal of the second metallic return conversion switch circuit, and the second of the 4th change-over switch
End is connected with the output end of the second metallic return conversion switch circuit, the input terminal of the 4th LC oscillation circuit and institute
The first end for stating the 4th change-over switch is connected, and the of the output end of the 4th LC oscillation circuit and the 4th change-over switch
Two ends are connected, and the first end of the 4th arrester is connected with the first end of the 4th change-over switch, and the described 4th keeps away
The second end of thunder device is connected with the second end of the 4th change-over switch.
9. a kind of DC transmission system characterized by comprising the first converter station, the second converter station and DC line；Wherein,
First converter station includes such as the described in any item direct current conversion switch circuits of Claims 1-4；The direct current change-over switch
Circuit includes the first direct current change-over switch branch and the first Ground return conversion switch circuit；Wherein, the first direct current conversion
The input terminal of switching branches is connect by neutral bus with the input terminal of the first Ground return conversion switch circuit, and described the
The output end that switching branches are changed in circulation always is connected with ground connection polar curve, the output of the first Ground return conversion switch circuit
End is connected with metallic return；First converter station is connect by DC line with second converter station.
10. a kind of DC transmission system characterized by comprising third converter station, the 4th converter station and DC line；Wherein,
The third converter station includes such as the described in any item direct current conversion switch circuits of claim 5 to 8；The direct current change-over switch
Circuit includes the second direct current change-over switch branch and the second metallic return conversion switch circuit；Wherein, the second direct current conversion
The input terminal of switching branches is connect by neutral bus with the input terminal of the second metallic return conversion switch circuit, and described the
The output end of two direct current change-over switch branches is connected with metallic return, the output of the second metallic return conversion switch circuit
End is connected with ground connection polar curve；The third converter station is connect by DC line with the 4th converter station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811168213.XA CN109193740B (en) | 2018-10-08 | 2018-10-08 | Direct-current transfer switch circuit and direct-current transmission system based on converter station |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811168213.XA CN109193740B (en) | 2018-10-08 | 2018-10-08 | Direct-current transfer switch circuit and direct-current transmission system based on converter station |
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| CN109193740A true CN109193740A (en) | 2019-01-11 |
| CN109193740B CN109193740B (en) | 2023-09-26 |
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| CN102082432A (en) * | 2010-12-09 | 2011-06-01 | 国家电网公司 | Cascading convertor station and cascading multi-terminal high-voltage direct-current (MTHVDC) transmission system |
| CN102611096A (en) * | 2012-03-13 | 2012-07-25 | 浙江大学 | Bipolar direct current power transmission system with direct current failure self-elimination capacity |
| CN105048487A (en) * | 2015-08-20 | 2015-11-11 | 南方电网科学研究院有限责任公司 | Method and device for quickly converting earth return wire and metal return wire in single-twelve-pulse direct current transmission system |
| CN106501631A (en) * | 2016-09-08 | 2017-03-15 | 国家电网公司 | High voltage DC breaker lightning arrester connected in parallel leakage current monitoring device and method |
| CN107785920A (en) * | 2017-10-30 | 2018-03-09 | 南方电网科学研究院有限责任公司 | Control method and device for converting ground return wire into metal return wire and power transmission system |
| US20180109109A1 (en) * | 2015-05-18 | 2018-04-19 | Abb Schweiz Ag | Change of current return path in a bipole power transmission system |
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2018
- 2018-10-08 CN CN201811168213.XA patent/CN109193740B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102082432A (en) * | 2010-12-09 | 2011-06-01 | 国家电网公司 | Cascading convertor station and cascading multi-terminal high-voltage direct-current (MTHVDC) transmission system |
| CN102611096A (en) * | 2012-03-13 | 2012-07-25 | 浙江大学 | Bipolar direct current power transmission system with direct current failure self-elimination capacity |
| US20180109109A1 (en) * | 2015-05-18 | 2018-04-19 | Abb Schweiz Ag | Change of current return path in a bipole power transmission system |
| CN105048487A (en) * | 2015-08-20 | 2015-11-11 | 南方电网科学研究院有限责任公司 | Method and device for quickly converting earth return wire and metal return wire in single-twelve-pulse direct current transmission system |
| CN106501631A (en) * | 2016-09-08 | 2017-03-15 | 国家电网公司 | High voltage DC breaker lightning arrester connected in parallel leakage current monitoring device and method |
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| CN109193740B (en) | 2023-09-26 |
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