CN209056939U - A kind of direct current conversion switch circuit and DC transmission system based on converter station - Google Patents
A kind of direct current conversion switch circuit and DC transmission system based on converter station Download PDFInfo
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- CN209056939U CN209056939U CN201821631974.XU CN201821631974U CN209056939U CN 209056939 U CN209056939 U CN 209056939U CN 201821631974 U CN201821631974 U CN 201821631974U CN 209056939 U CN209056939 U CN 209056939U
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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
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- 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 utility model discloses a kind of direct current conversion switch circuit and DC transmission system based on converter station, the direct current conversion switch circuit includes the first metallic return conversion switch circuit and the first Ground return conversion switch circuit, the direct current conversion switch circuit includes the second metallic return conversion switch circuit and the second Ground return conversion switch circuit, when DC transmission system is when progress ground return circuit turns metallic(return) circuit, by the way that the first current-limiting resistance and the first by-pass switch is arranged in the first metallic return conversion switch circuit；When DC transmission system is when progress metallic(return) circuit turns ground return circuit, by the way that the second current-limiting resistance and the second by-pass switch is arranged in the second Ground return conversion switch circuit；It can be effectively reduced the energy that arrester absorbs in change-over switch, keep DC transmission system more smooth when progress ground return circuit turns metallic(return) circuit or metallic(return) circuit turns ground return circuit.
Description
Technical field
The utility model relates to technical field of direct current power transmission more particularly to a kind of direct current change-over switch electricity based on converter station
Road and 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.
It carries out greatly turning metal in DC transmission system 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.
Utility model content
The purpose of the utility model is to provide a kind of direct current conversion switch circuit based on converter station, works as DC transmission system
When progress ground return circuit turns metallic(return) circuit or metallic(return) circuit turns ground return circuit, it can be effectively reduced in change-over switch and take shelter from the thunder
The energy that device absorbs, make DC transmission system carry out ground return circuit turn metallic(return) circuit or when metallic(return) circuit turns ground return circuit more
Add smoothly.
In order to solve the above technical problems, the utility model embodiment provides a kind of direct current change-over switch based on converter station
Circuit, the direct current conversion switch circuit include: the first metallic return conversion switch circuit and the first Ground return change-over switch
Circuit；Wherein, the input terminal of the first metallic return conversion switch circuit passes through neutral bus and first Ground return
The input terminal of conversion switch circuit connects, and the output end of the first metallic return conversion switch circuit is connected with ground connection polar curve
It connects；The output end of the first Ground return conversion switch circuit is connected with metallic return；The first metallic return conversion
Switching circuit includes that the first current-limiting resistance, the first by-pass switch, the first change-over switch, the first LC oscillation circuit and first are lightning-arrest
Device；Wherein, the first end of first change-over switch is connected with the input terminal of the first metallic return conversion switch circuit,
The second end of first change-over switch is connected with the first end of first by-pass switch；The of first by-pass switch
Two ends are connected with the output end of the first metallic return conversion switch circuit, the first end of first current-limiting resistance and institute
The first end for stating the first by-pass switch is connected, and the second of the second end of first current-limiting resistance and first by-pass switch
End is connected, and the input terminal of the first LC oscillation circuit is connected with the first end of first change-over switch, and described first
The output end of LC oscillation circuit is connected with the second end of first by-pass switch, the first end of first arrester and institute
The first end for stating the first change-over switch is connected, the second end of the second end of first arrester and first by-pass switch
It is connected.
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.
Preferably, first by-pass switch is disconnecting switch.
Preferably, first by-pass switch is breaker.
The utility model embodiment additionally provides a kind of direct current conversion switch circuit based on converter station, the direct current conversion
Switching circuit includes the second metallic return conversion switch circuit and the second Ground return conversion switch circuit；Wherein, described second
The input terminal of metallic return conversion switch circuit passes through the input of neutral bus and the second Ground return conversion switch circuit
The output end of end connection, the second metallic return conversion switch circuit is connected with ground connection polar curve；Second Ground return
The output end of conversion switch circuit is connected with metallic return；The second Ground return conversion switch circuit includes the second current limliting
Resistance, the second by-pass switch, 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 first end of second by-pass switch；The second end of second by-pass switch and second Ground return
The output end of conversion switch circuit is connected, the first end of the first end of second current-limiting resistance and second by-pass switch
It is connected, the second end of second current-limiting resistance is connected with the second end of second by-pass switch, the 3rd LC vibration
The input terminal for swinging circuit is connected with the first end of the third change-over switch, the output end of the 3rd LC oscillation circuit with
The second end of second by-pass switch is connected, and the first of the first end of the third arrester and the third change-over switch
End is connected, and the second end of the third arrester is connected with the second end of second by-pass switch.
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.
Preferably, second by-pass switch is disconnecting switch.
Preferably, second by-pass switch is breaker.
The utility model embodiment additionally provides a kind of DC transmission system, and the DC transmission system includes first change of current
It stands, the second converter station and DC line；Wherein, first converter station includes such as above-mentioned direct current conversion switch circuit；It is described
Direct current conversion switch circuit includes the first metallic return conversion switch circuit and the first Ground return conversion switch circuit；Wherein,
The input terminal of the first metallic return conversion switch circuit passes through neutral bus and the first Ground return change-over switch electricity
The input terminal on road connects, and the output end of the first metallic return conversion switch circuit is connected with ground connection polar curve；Described first
The output end of Ground return conversion switch circuit is connected with metallic return, first converter station by DC line with it is described
The connection of second converter station.
The utility model embodiment additionally provides a kind of DC transmission system, and the DC transmission system includes the third change of current
It stands, the 4th converter station and DC line；Wherein, the third converter station includes such as above-mentioned direct current conversion switch circuit；It is described
Direct current conversion switch circuit includes the second metallic return conversion switch circuit and the second Ground return conversion switch circuit；Wherein,
The input terminal of the second metallic return conversion switch circuit passes through neutral bus and the second Ground return change-over switch electricity
The input terminal on road connects, and the output end of the second metallic return conversion switch circuit is connected with ground connection polar curve；Described second
The output end of Ground return conversion switch circuit is connected with metallic return, the third converter station by DC line with it is described
The connection of 4th converter station.
Compared with the existing technology, a kind of direct current conversion switch circuit based on converter station provided by the embodiment of the utility model
Beneficial effect be: when DC transmission system carry out ground return circuit turn metallic(return) circuit when, by first metal return
The first current-limiting resistance and the first by-pass switch is arranged in line conversion switch circuit；When DC transmission system is carrying out metallic(return) circuit turn greatly
When earth-return, by the way that the second current-limiting resistance and the second by-pass switch is arranged in the second Ground return conversion switch circuit；Energy
It is enough effectively reduced the energy that arrester absorbs in change-over switch, DC transmission system is made to turn metallic(return) circuit in progress ground return circuit
Or metallic(return) circuit turns more smooth when ground return circuit.
Detailed description of the invention
Fig. 1 is the knot of a kind of DC transmission system when carrying out ground return circuit and turning metallic(return) circuit in the utility model embodiment
Structure schematic diagram；
Fig. 2 is the structural schematic diagram of the first metallic return conversion switch circuit in the utility model embodiment；
Fig. 3 is the structural schematic diagram of the first Ground return conversion switch circuit in the utility model embodiment；
Fig. 4 is kept away when the first metallic return conversion switch circuit is added without the first current-limiting resistance in the utility model embodiment
The variation schematic diagram of energy, Ground return electric current and metallic return electric current that thunder device absorbs；
Fig. 5 is the resistance value that the first current-limiting resistance is added in the first metallic return conversion switch circuit in the utility model embodiment
The variation schematic diagram of arrester absorbs when for 10 Ω energy, Ground return electric current and metallic return electric current；
Fig. 6 is the resistance value that the first current-limiting resistance is added in the first metallic return conversion switch circuit in the utility model embodiment
The variation schematic diagram of arrester absorbs when for 20 Ω energy, Ground return electric current and metallic return electric current；
Fig. 7 is the knot of a kind of DC transmission system when carrying out metallic(return) circuit and turning ground return circuit in the utility model embodiment
Structure schematic diagram.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
Every other embodiment obtained, fall within the protection scope of the utility model.
Referring to Fig. 1, it is that a kind of DC transmission system provided by the embodiment of the utility model is carrying out ground return circuit turn
Structural schematic diagram when metallic(return) circuit, the DC transmission system include the first converter station 1, the second converter station 2 and DC line；
Wherein, first converter station 1 includes direct current conversion switch circuit 3；The direct current conversion switch circuit 3 is returned including the first metal
Line conversion switch circuit 31 and the first Ground return conversion switch circuit 32；Wherein, the first metallic return change-over switch electricity
The input terminal on road 31 is connect by neutral bus with the input terminal of the first Ground return conversion switch circuit 32, and described first
The output end of metallic return conversion switch circuit 31 is connected with ground connection polar curve；The first Ground return conversion switch circuit
32 output end is connected with metallic return, and 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 31 and the first Ground return conversion switch circuit 32, and the multi-terminal direct current transmission system has multiple changes of current
It stands and the first metallic return conversion switch circuit 31 and the first Ground return conversion switch circuit 32 is set；Wherein, KN11、KN12、KN21
And KN22For neutral line isolation switch；K11、K12、 K21And K22For connecting the polar curve of the neutral conductor and operation of converter station extremely to pole,
Realize the monopolar metallic return method of operation；RPFor direct-current polar resistance；RERAnd REIThe respectively earthing pole of rectification side and inverter side
Line 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 metallic return conversion switch circuit 31 includes the
One current-limiting resistance 311, the first by-pass switch 312, the first change-over switch 313, the first LC oscillation circuit 314 and the first arrester
415；Wherein, the input terminal of the first end of first change-over switch 313 and the first metallic return conversion switch circuit 31
It is connected, the second end of first change-over switch 313 is connected with the first end of first by-pass switch 312；Described
The second end of bypass switch 312 is connected with the output end of the first metallic return conversion switch circuit 31, and described first
The first end of current-limiting resistance 311 is connected with the first end of first by-pass switch 312, first current-limiting resistance 311
Second end is connected with the second end of first by-pass switch 312, the input terminal of the first LC oscillation circuit 314 with it is described
The first end of first change-over switch 313 is connected, the output end and first by-pass switch of the first LC oscillation circuit 314
312 second end is connected, and the first end of first arrester 315 is connected with the first end of first change-over switch 313
It connects, the second end of first arrester 315 is connected with the second end of first by-pass switch 312.
In the present embodiment, by the way that the first current-limiting resistance 311 is arranged in the first metallic return conversion switch circuit 31
With the first by-pass switch 312, when the monopole the earth method of operation is converted to monopole metal method of operation process, investment described first
Metallic return conversion switch circuit 31, the direct current switching current that can be effectively reduced in DC transmission system, to reduce by the
The energy that the first arrester 315 in one metal conversion switch circuit 31 absorbs makes DC transmission system carry out ground return circuit
Turn more smooth when metallic(return) circuit；Wherein, the first metallic return conversion switch circuit 31 can be passive metallic return
Conversion switch circuit or active type metallic return conversion switch circuit.
Referring to Fig. 3, in an alternative embodiment, the first Ground return conversion switch circuit 32 includes the
Two change-over switches 321, the 2nd LC oscillation circuit 322 and the second arrester 323；Wherein, the first of second change-over switch 321
End is connected with the input terminal of the first Ground return conversion switch circuit 32, the second end of second change-over switch 321
It is connected with the output end of the first Ground return conversion switch circuit 32, the input terminal of the 2nd LC oscillation circuit 322
Be connected with the first end of second change-over switch 321, the output end of the 2nd LC oscillation circuit 322 with described second turn
The second end for changing switch 321 is connected, and the first of the first end of second arrester 323 and second change-over switch 321
End is connected, and the second end of second arrester 323 is connected with the second end of second change-over switch 321.
Wherein, first change-over switch 313 and second change-over switch 321 are transformed by AC circuit breaker；
The setting of the first LC oscillation circuit 314 and the 2nd LC oscillation circuit 322 is to form current over-zero in circuit to allow
Point；And first arrester 315 and second arrester 323 are metal oxide, are deposited for absorbing in DC loop
The energy of storage；The first Ground return conversion switch circuit 32 can for passive Ground return conversion switch circuit or
Active type Ground 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 first metallic return and turn
Switching circuit 31 is changed, at this time KN11And KN12In closed state, KN21And KN22It is in an off state；
Firstly, the first metallic return conversion switch circuit 31 is made to be in closed state, first Ground return turns
It changes switching circuit 32 to be in an off state, the first by-pass switch KR312 are in closed state, K11、 K12、K21And K22It is in
Off-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 31 is made to be in closed state, first Ground return turns
It changes switching circuit 32 and is in closed state, the first by-pass switch KR312 are in closed state, K12And K22In closed form
State, K11And K21It is in an off state；The DC current of the DC transmission system is in Ground return and metallic return two at this time
It is shunted in circuit；It is then turned off the first by-pass switch KR312, the first current-limiting resistance 311 is put into, Ground return is flowed through
The DC current of the DC transmission system further decreases；
It is then turned off the first metallic return conversion switch circuit 31, makes the DC transmission system in Ground return
DC current be transferred to metallic return circuit；
After the first metallic return conversion switch circuit 31 disconnects, ground electrode circuit loop current is zero, described in closure
First by-pass switch KR312 bypass first current-limiting resistance 311.
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 31MRTBNot 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 311 is related, and first current-limiting resistance 311 is used to adjust the size of direct current switching current；According to formulaCalculate I after putting into first current-limiting resistance 311MRTBValue；Wherein, IdFor the direct current transportation
The DC current of system；When not putting into first current-limiting resistance 311, direct current switching current is according to formulaIt is calculated, it can be seen that, the direct current switching current IMRTBBy direct-current polar resistance Rp, ground connection polar curve
Road resistance RERAnd REIIntrinsic parameter in system determines, can not reasonably be adjusted, therefore by putting into the first current limliting electricity
Resistance 311 can realize the function of adjustment direct current switching current size.
In an alternative embodiment, first by-pass switch 312 is disconnecting switch.Wherein, the disconnecting switch
Structure is simple, it is at low cost and also have stronger resistance to arcing ability.
In an alternative embodiment, first by-pass switch 312 is breaker.Wherein, the breaker is arc
Hinder higher breaker or vacuum circuit breaker；By-pass switch can realize fast transfer DC current using LC oscillation circuit.
First current-limiting resistance 311 is used to adjust the direct current switching current in the DC transmission system.
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 be when the first metallic return conversion switch circuit 31 is added without the first current-limiting resistance 311 arrester absorb energy,
The variation schematic diagram of Ground return electric current and metallic return electric current；Fig. 5 is that the first metallic return conversion switch circuit 31 is added the
The variation of arrester absorbs when the resistance value of one current-limiting resistance 311 is 10 Ω energy, Ground return electric current and metallic return electric current
Schematic diagram；Fig. 6 is that arrester when the resistance value of the first current-limiting resistance 311 is 20 Ω is added in the first metallic return conversion switch circuit 31
The variation schematic diagram of the energy of absorption, Ground return electric current and metallic return electric current.It can analyze and obtain from figure, investment first
After current-limiting resistance 311, i.e., the resistance value of the first current-limiting resistance 311 from 0 to 10 Ω again to 20 Ω when, with before converting, Ground return is returned
Road electric current is reduced to 1.9kA again to 1.4kA from 2.8kA, and described first in the first metallic return conversion switch circuit 31
The energy that arrester 315 absorbs substantially reduces, and is reduced to 7.8MJ from 16MJ and drops to 4.4MJ again；It can be seen that described
The preceding Ground return loop current of energy and conversion that one arrester 315 absorbs is close to quadratic relationship, Ground return circuit before converting
Electric current is down to original half, and the energy that first arrester 315 absorbs will drop to about original a quarter.It can be seen that
By the way that current-limiting resistance is arranged, the direct current switching current that can be effectively reduced in the DC transmission system and arrester absorb
Energy, keep DC transmission system more smooth when carrying out circuit conversion.
Referring to Fig. 7, it is that a kind of DC transmission system provided by the embodiment of the utility model is carrying out metallic(return) circuit turn
Structural schematic diagram when ground return circuit, the DC transmission system include third converter station 4, the 4th converter station 5 and DC line；
Wherein, the third converter station 4 includes direct current conversion switch circuit 6；The direct current conversion switch circuit is returned including the second metal
Line conversion switch circuit 61 and the second Ground return conversion switch circuit 62；Wherein, the second metallic return change-over switch electricity
The input terminal on road 61 is connect by neutral bus with the input terminal of the second Ground return conversion switch circuit 62, and described second
The output end of metallic return conversion switch circuit 61 is connected with ground connection polar curve；The second Ground return conversion switch circuit
62 output end is connected with metallic return, and the third converter station 4 is connect by DC line with the 4th converter station 5.
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 61 and the second Ground return conversion switch circuit 62, and the multi-terminal direct current transmission system has multiple changes of current
It stands and the second metallic return conversion switch circuit 61 and the second Ground return conversion switch circuit 62 is set；Wherein, KN11、KN12、KN21
And KN22For neutral line isolation switch；K11、K12、 K21And K22For connecting the polar curve of the neutral conductor and operation of converter station extremely to pole,
Realize the monopolar metallic return method of operation；RPFor direct-current polar resistance；RERAnd REIThe respectively earthing pole of rectification side and inverter side
Line 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 Ground return conversion switch circuit 62 include the second current-limiting resistance,
Second by-pass switch, third change-over switch, the 3rd LC oscillation circuit and third arrester；Wherein, the third change-over switch
First end is connected with the input terminal of the second Ground return conversion switch circuit 62, the second end of the third change-over switch
It is connected with the first end of second by-pass switch；The second end of second by-pass switch and second Ground return turn
The output end for changing switching circuit 62 is connected, the first end of the first end of second current-limiting resistance and second by-pass switch
It is connected, the second end of second current-limiting resistance is connected with the second end of second by-pass switch, the 3rd LC vibration
The input terminal for swinging circuit is connected with the first end of the third change-over switch, the output end of the 3rd LC oscillation circuit and institute
The second end for stating the second by-pass switch is connected, the first end of the first end of the third arrester and the third change-over switch
It is connected, the second end of the third arrester is connected with the second end of second by-pass switch.
In the present embodiment, by the way that the second current-limiting resistance and the is arranged in the second Ground return conversion switch circuit 62
Two by-pass switches put into second the earth and return when the monopole metal method of operation is converted to monopole the earth method of operation process
Line conversion switch circuit 62, the direct current switching current that can be effectively reduced in DC transmission system, to reduce the second the earth
The energy that third arrester in conversion switch circuit 62 absorbs makes DC transmission system turn ground return circuit in progress metallic(return) circuit
Shi Gengjia is smooth；Wherein, the second Ground return conversion switch circuit 62 can be passive Ground return change-over switch electricity
Road or active type Ground 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 metallic return conversion switch circuit 61 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 61 is connected, the second end of the 4th change-over switch and the second metallic return change-over switch
The output end of circuit 61 is connected, and the input terminal of the 4th LC oscillation circuit is connected with the first end of the 4th change-over switch
It connects, the output end of the 4th LC oscillation circuit is connected with the second end of the 4th change-over switch, the 4th arrester
First end be connected with the first end of the 4th change-over switch, the second end of the 4th arrester and it is described 4th conversion
The second end of switch is connected.
In the present embodiment, the 4th change-over switch is transformed by AC circuit breaker；4th LC vibrates back
The setting on road is to form current zero-crossing point in circuit to allow；And the 4th arrester is metal oxide, it is straight for absorbing
Flow back to the energy stored in road；Wherein, the second metallic return conversion switch circuit 61 can turn for passive metallic return
Change switching circuit or 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 by the embodiment of the utility model
Beneficial effect be: when DC transmission system carry out ground return circuit turn metallic(return) circuit when, by first metal return
The first current-limiting resistance and the first by-pass switch is arranged in line conversion switch circuit；When DC transmission system is carrying out metallic(return) circuit turn greatly
When earth-return, by the way that the second current-limiting resistance and the second by-pass switch is arranged in the second Ground return conversion switch circuit；Energy
It is enough effectively reduced the energy that arrester absorbs in change-over switch, DC transmission system is made to turn metallic(return) circuit in progress ground return circuit
Or metallic(return) circuit turns more smooth when ground return circuit.
The above is preferred embodiments of the present invention, it is noted that for the ordinary skill of the art
For personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these are improved and profit
Decorations are also considered as the protection scope of the utility model.
Claims (10)
1. a kind of direct current conversion switch circuit based on converter station characterized by comprising the first metallic return change-over switch electricity
Road and the first Ground return conversion switch circuit；Wherein, during the input terminal of the first metallic return conversion switch circuit passes through
Sexupara line is connect with the input terminal of the first Ground return conversion switch circuit, the first metallic return conversion switch circuit
Output end with ground connection polar curve be connected；The output end of the first Ground return conversion switch circuit is connected with metallic return
It connects；The first metallic return conversion switch circuit includes the first current-limiting resistance, the first by-pass switch, the first change-over switch, the
One LC oscillation circuit and the first arrester；Wherein, the first end of first change-over switch and first metallic return are converted
The input terminal of switching circuit is connected, and the second end of first change-over switch is connected with the first end of first by-pass switch
It connects；The second end of first by-pass switch is connected with the output end of the first metallic return conversion switch circuit, described
The first end of first current-limiting resistance is connected with the first end of first by-pass switch, the second end of first current-limiting resistance
It is connected with the second end of first by-pass switch, the input terminal and first change-over switch of the first LC oscillation circuit
First end be connected, the output end of the first LC oscillation circuit is connected with the second end of first by-pass switch, institute
The first end for stating the first arrester is connected with the first end of first change-over switch, the second end of first arrester with
The second end of first by-pass switch is connected.
2. 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.
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 disconnecting switch.
4. 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.
5. a kind of direct current conversion switch circuit based on converter station characterized by comprising the second metallic return change-over switch electricity
Road and the second Ground return conversion switch circuit；Wherein, during the input terminal of the second metallic return conversion switch circuit passes through
Sexupara line is connect with the input terminal of the second Ground return conversion switch circuit, the second metallic return conversion switch circuit
Output end with ground connection polar curve be connected；The output end of the second Ground return conversion switch circuit is connected with metallic return
It connects；The second Ground return conversion switch circuit includes the second current-limiting resistance, the second by-pass switch, third change-over switch, the
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, and the second end of the third change-over switch is connected with the first end of second by-pass switch
It connects；The second end of second by-pass switch is connected with the output end of the second Ground return conversion switch circuit, described
The first end of second current-limiting resistance is connected with the first end of second by-pass switch, the second end of second current-limiting resistance
It is connected with the second end of second by-pass switch, the input terminal and the third change-over switch of the 3rd LC oscillation circuit
First end be connected, the output end of the 3rd LC oscillation circuit is connected with the second end of second by-pass switch, institute
The first end for stating third arrester is connected with the first end of the third change-over switch, the second end of the third arrester with
The second end of second by-pass switch is connected.
6. the direct current conversion switch circuit based on converter station as claimed in claim 5, 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.
7. the direct current conversion switch circuit based on converter station as claimed in claim 5, which is characterized in that second bypass is opened
Closing is disconnecting switch.
8. the direct current conversion switch circuit based on converter station as claimed in claim 5, which is characterized in that second bypass is opened
Closing is breaker.
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 metallic return conversion switch circuit and the first Ground return conversion switch circuit；Wherein, first metal
The input terminal of loop line conversion switch circuit is connected by the input terminal of neutral bus and the first Ground return conversion switch circuit
It connects, the output end of the first metallic return conversion switch circuit is connected with ground connection polar curve；The first Ground return conversion
The output end of switching circuit is connected with metallic return, and first converter station is connected by DC line and second converter station
It connects.
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 metallic return conversion switch circuit and the second Ground return conversion switch circuit；Wherein, second metal
The input terminal of loop line conversion switch circuit is connected by the input terminal of neutral bus and the second Ground return conversion switch circuit
It connects, the output end of the second metallic return conversion switch circuit is connected with ground connection polar curve；The second Ground return conversion
The output end of switching circuit is connected with metallic return, and the third converter station is connected by DC line and the 4th converter station
It connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821631974.XU CN209056939U (en) | 2018-10-08 | 2018-10-08 | A kind of direct current conversion switch circuit and DC transmission system based on converter station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821631974.XU CN209056939U (en) | 2018-10-08 | 2018-10-08 | A kind of direct current conversion switch circuit and DC transmission system based on converter station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209056939U true CN209056939U (en) | 2019-07-02 |
Family
ID=67050107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821631974.XU Withdrawn - After Issue CN209056939U (en) | 2018-10-08 | 2018-10-08 | A kind of direct current conversion switch circuit and DC transmission system based on converter station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209056939U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109193739A (en) * | 2018-10-08 | 2019-01-11 | 南方电网科学研究院有限责任公司 | A kind of direct current conversion switch circuit and DC transmission system based on converter station |
| CN110729745A (en) * | 2019-08-28 | 2020-01-24 | 中国南方电网有限责任公司超高压输电公司广州局 | Multi-terminal direct current system change-over switch parameter calculation method |
-
2018
- 2018-10-08 CN CN201821631974.XU patent/CN209056939U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109193739A (en) * | 2018-10-08 | 2019-01-11 | 南方电网科学研究院有限责任公司 | A kind of direct current conversion switch circuit and DC transmission system based on converter station |
| CN109193739B (en) * | 2018-10-08 | 2024-01-26 | 南方电网科学研究院有限责任公司 | Direct-current transfer switch circuit and direct-current transmission system based on converter station |
| CN110729745A (en) * | 2019-08-28 | 2020-01-24 | 中国南方电网有限责任公司超高压输电公司广州局 | Multi-terminal direct current system change-over switch parameter calculation method |
| CN110729745B (en) * | 2019-08-28 | 2020-09-01 | 中国南方电网有限责任公司超高压输电公司广州局 | Multi-terminal direct current system change-over switch parameter calculation method |
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