CN109873346A - DC power transmission common grounding electrode system maintenance method and device - Google Patents
DC power transmission common grounding electrode system maintenance method and device Download PDFInfo
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- CN109873346A CN109873346A CN201910104882.9A CN201910104882A CN109873346A CN 109873346 A CN109873346 A CN 109873346A CN 201910104882 A CN201910104882 A CN 201910104882A CN 109873346 A CN109873346 A CN 109873346A
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- 238000012423 maintenance Methods 0.000 title claims abstract description 26
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Abstract
The invention discloses a method and a device for overhauling a direct current transmission common grounding electrode system, which comprise the following steps: simulating the direct-current transmission common grounding electrode system by adopting a preset simulation model to obtain current flowing into a converter station grounding grid under a preset operation condition; calculating the bias current of a single transformer of the converter station according to the current flowing into the grounding grid of the converter station; when the bias current of the single transformer of the converter station is detected to be larger than the preset current threshold, a temporary grounding wire is installed on a preset tower of the grounding electrode circuit of the direct current transmission common grounding electrode system, the simulation model is adopted again to simulate the direct current transmission common grounding electrode system added with the temporary grounding wire until the bias current of the single transformer of the converter station after simulation is not larger than the preset current threshold, the influence on the converter station during maintenance of the grounding electrode circuit of the direct current transmission common grounding electrode system can be effectively reduced, and the safety during maintenance can be effectively improved.
Description
Technical field
The present invention relates to technical field of HVDC transmission more particularly to a kind of direct current transportation One Common Earthing Electrode system overhauls
Method and device.
Background technique
D.C. high voltage transmission have many advantages, such as transmission capacity big, low cost, loss it is small, can Asynchronous Interconnection, while direct current work
Cheng Jianshe and the continuous growth that puts into operation.Earthing pole is the pith of HVDC transmission system, but is usually taken up a large area,
Expropriation of land is difficult, and topography and geomorphology and densely populated problem seem more prominent, and current Partial DC engineering is adopted to solve this problem
With multiple-circuit line One Common Earthing Electrode technology.Multiple-circuit line One Common Earthing Electrode, that is, multiple-circuit line shares same earthing pole, passes through center
It is respectively switched in tower to control whether its ground electrode circuit accesses earthing pole.However, One Common Earthing Electrode can also produce direct current system
Raw certain influence can be steady safely to converter station when a direct current monopole the earth operation, another time direct current grounding pole line maintenance
Fixed operation has an impact.Specifically, when certain returns direct current grounding pole line maintenance, respective switch of breaking in central tower, interior ground connection of standing
Polar curve road earthing switch is in ground state (i.e. ground electrode circuit is connected with interior grounded screen of standing), ground electrode circuit first and end
Shaft tower hangs continuous earth line, and should also hang temporary grounding when line maintenance near the shaft tower in 10 kilometer range of earthing pole
Line, this provides access for electric current, therefore when a direct current monopole the earth is run, electric current leaks into the earth by earthing pole, closes on
Tower grounding device picks up part earth current, and grounded polar curve road flows into grounded screen in converter station, and then passes through transformation
Device neutral point, which flows into AC system, influences direct current system safe and stable operation to cause DC magnetic bias phenomena.
Summary of the invention
The embodiment of the present invention provides a kind of direct current transportation One Common Earthing Electrode system overhaul method and device, can be effectively reduced
The influence that converter station is generated when the ground electrode circuit maintenance of direct current transportation One Common Earthing Electrode system, when can effectively improve maintenance
Safety.
One embodiment of the invention provides a kind of direct current transportation One Common Earthing Electrode system overhaul method, comprising:
Direct current transportation One Common Earthing Electrode system is emulated using pre-set simulation model, obtains default operation work
The electric current of converter station earth mat is flowed under condition；
According to the electric current for flowing into converter station earth mat, converter station single transformer bias current is calculated；
It is when detecting that the converter station single transformer bias current is greater than predetermined current threshold, then defeated to the direct current
The default shaft tower of the ground electrode circuit of electric One Common Earthing Electrode system installs temporary ground wire, and uses the simulation model pair again
Direct current transportation One Common Earthing Electrode system after temporary ground wire is added is emulated, until the converter station single transformer after emulation
Bias current is not more than the predetermined current threshold.
As an improvement of the above scheme, use pre-set simulation model to direct current transportation One Common Earthing Electrode system described
System is emulated, and is obtained flowing into before the electric current of converter station earth mat under default operating condition, be specifically included:
When overhauling the m base shaft tower of ground electrode circuit of direct current transportation One Common Earthing Electrode system, in the ground connection polar curve
First base shaft tower on road and the n-th base shaft tower install continuous earth line；Wherein, 1≤m≤n, n are the shaft tower of the ground electrode circuit
Quantity；
Judge the m base shaft tower whether the earthing pole apart from the direct current transportation One Common Earthing Electrode system default model
In enclosing；If so, installing temporary ground wire in the m base shaft tower；If it is not, then without interim in m base shaft tower installing
Ground line.
As an improvement of the above scheme, described to use pre-set simulation model to direct current transportation One Common Earthing Electrode system
It is emulated, obtains the electric current for flowing into converter station earth mat under default operating condition, specifically include:
According to the direct current transportation One Common Earthing Electrode system, simulation model is constructed；
With the default operating condition, the simulation model is set；Wherein, the default operating condition is that the direct current is defeated
The One Common Earthing Electrode one of electric One Common Earthing Electrode system returns direct current monopole the earth and runs, and another time direct current grounding pole route is in maintenance
State；
Using the simulation model, shared with installing the direct current transportation after temporary ground wire to the m base shaft tower
Ground electrode system is emulated, and the electric current for flowing into converter station earth mat is obtained.
As an improvement of the above scheme, described according to the electric current for flowing into converter station earth mat, it calculates converter station separate unit and becomes
Depressor bias current, specifically includes:
The converter station single transformer bias current is calculated according to the following formula:
It=KIn/n
Wherein, ItFor the converter station single transformer bias current, K is that converter station earth mat electric current inflow transformer is neutral
The diverting coefficient of point, InFor the electric current for flowing into converter station earth mat, n is transformer station high-voltage side bus number of units.
As an improvement of the above scheme, the earthing pole of the direct current transportation One Common Earthing Electrode system is judged as follows
Whether route, which needs, takes measures:
Judge whether the converter station single transformer bias current is greater than predetermined current threshold；If the converter station separate unit
Transformer bias electric current is not more than the predetermined current threshold, then judges the ground electrode circuit without taking measures；If described
Converter station single transformer bias current is greater than the predetermined current threshold, then judges to need in the default of the ground electrode circuit
Shaft tower installs temporary ground wire.
As an improvement of the above scheme, described to detect that the converter station single transformer bias current is greater than default electricity
When flowing threshold value, then temporary ground wire is installed to the default shaft tower of the ground electrode circuit of the direct current transportation One Common Earthing Electrode system,
And the direct current transportation One Common Earthing Electrode system after temporary ground wire is added is emulated using the simulation model again, until
Converter station single transformer bias current after emulation is not more than the predetermined current threshold, specifically includes:
When detecting that the converter station single transformer bias current is greater than the predetermined current threshold, based on described the
M base shaft tower installs temporary ground wire, installs temporary ground wire close to the shaft tower of converter station in the ground electrode circuit, and again
The direct current transportation One Common Earthing Electrode system after temporary ground wire is added is emulated using the simulation model, until after emulation
Converter station single transformer bias current be not more than the predetermined current threshold.
As an improvement of the above scheme, described to detect that the converter station single transformer bias current is greater than default electricity
When flowing threshold value, then temporary ground wire is installed to the default shaft tower of the ground electrode circuit of the direct current transportation One Common Earthing Electrode system,
And the direct current transportation One Common Earthing Electrode system after temporary ground wire is added is emulated using the simulation model again, until
Converter station single transformer bias current after emulation is not more than the predetermined current threshold, specifically further include:
When detecting that the converter station single transformer bias current is greater than the predetermined current threshold, based on described the
M base shaft tower installs temporary ground wire, installs temporary ground wire to the shaft tower for being located at the ground electrode circuit interlude, and adopt again
The direct current transportation One Common Earthing Electrode system after temporary ground wire is added is emulated with the simulation model, until after emulation
Converter station single transformer bias current is not more than the predetermined current threshold.
Another embodiment of the present invention correspondence provides a kind of direct current transportation One Common Earthing Electrode system overhaul device, comprising:
Emulation module, for being emulated using pre-set simulation model to direct current transportation One Common Earthing Electrode system,
Obtain the electric current that converter station earth mat is flowed under default operating condition；
Computing module, for calculating converter station single transformer bias electricity according to the electric current for flowing into converter station earth mat
Stream；
Overhaul module, for when detect the converter station single transformer bias current be greater than predetermined current threshold when,
Temporary ground wire then is installed to the default shaft tower of the ground electrode circuit of the direct current transportation One Common Earthing Electrode system, and is used again
The simulation model emulates the direct current transportation One Common Earthing Electrode system after temporary ground wire is added, until changing after emulation
Stream station single transformer bias current is not more than the predetermined current threshold.
Compared with prior art, direct current transportation One Common Earthing Electrode system overhaul method disclosed by the embodiments of the present invention and dress
It sets, direct current transportation One Common Earthing Electrode system is emulated by using pre-set simulation model, obtain default operation work
It is inclined to calculate converter station single transformer according to the electric current for flowing into converter station earth mat for the electric current that converter station earth mat is flowed under condition
Magnetoelectricity stream, it is when detecting that the converter station single transformer bias current is greater than predetermined current threshold, then defeated to the direct current
The default shaft tower of the ground electrode circuit of electric One Common Earthing Electrode system installs temporary ground wire, and uses the simulation model pair again
Direct current transportation One Common Earthing Electrode system after temporary ground wire is added is emulated, until the converter station single transformer after emulation
Bias current is not more than the predetermined current threshold, plays shunting function using in ground electrode circuit installing temporary ground wire,
Converter station earth mat electric current is flowed into reduce, the shadow that converter station generates when shared earthing pole can be effectively reduced to earthing pole line maintenance
It rings, guarantees the safety of personnel and equipment when maintenance.
Another embodiment of the present invention provides a kind of direct current transportation One Common Earthing Electrode system overhaul device, including processor,
Memory and storage in the memory and are configured as the computer program executed by the processor, the processor
Direct current transportation One Common Earthing Electrode system overhaul method described in foregoing invention embodiment is realized when executing the computer program.
Another embodiment of the present invention provides a kind of storage medium, the computer readable storage medium includes the meter of storage
Calculation machine program, wherein control equipment where the computer readable storage medium in computer program operation and execute
State direct current transportation One Common Earthing Electrode system overhaul method described in inventive embodiments.
Detailed description of the invention
Fig. 1 is a kind of process signal for direct current transportation One Common Earthing Electrode system overhaul method that one embodiment of the invention provides
Figure；
Fig. 2 is the schematic diagram for the converter station single transformer bias current that one embodiment of the invention provides；
Fig. 3 is the signal for increasing grounding point in direct current transportation One Common Earthing Electrode system that one embodiment of the invention provides
Figure；
Fig. 4 is the bias when ground electrode circuit installs temporary ground wire close to converter station end that one embodiment of the invention provides
The schematic diagram of current curve；
Fig. 5 is bias current curve when the ground electrode circuit interlude that one embodiment of the invention provides installs temporary ground wire
Schematic diagram；
Fig. 6 is a kind of structural representation for direct current transportation One Common Earthing Electrode system overhaul device that one embodiment of the invention provides
Figure.
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.
It is a kind of stream for direct current transportation One Common Earthing Electrode system overhaul method that one embodiment of the invention provides referring to Fig. 1
Journey schematic diagram, comprising:
S11, direct current transportation One Common Earthing Electrode system is emulated using pre-set simulation model, obtains default fortune
The electric current of converter station earth mat is flowed under row operating condition.
Preferably, before step S11, further includes:
When overhauling the m base shaft tower of ground electrode circuit of direct current transportation One Common Earthing Electrode system, in the ground connection polar curve
First base shaft tower on road and the n-th base shaft tower install continuous earth line；Wherein, 1≤m≤n, n are the shaft tower of the ground electrode circuit
Quantity；
Judge the m base shaft tower whether the earthing pole apart from the direct current transportation One Common Earthing Electrode system default model
In enclosing；If so, installing temporary ground wire in the m base shaft tower；If it is not, then without interim in m base shaft tower installing
Ground line.
Specifically, step S11 are as follows:
According to the direct current transportation One Common Earthing Electrode system, simulation model is constructed；
With the default operating condition, the simulation model is set；Wherein, the default operating condition is that the direct current is defeated
The One Common Earthing Electrode one of electric One Common Earthing Electrode system returns direct current monopole the earth and runs, and another time direct current grounding pole route is in maintenance
State；
Using the simulation model, shared with installing the direct current transportation after temporary ground wire to the m base shaft tower
Ground electrode system is emulated, and the electric current for flowing into converter station earth mat is obtained.
It should be noted that the direct current transportation One Common Earthing Electrode system may include earthing pole, ground electrode circuit, the change of current
It stands earth mat；Wherein, several base shaft towers are distributed on the ground electrode circuit.To direct current transportation One Common Earthing Electrode system in simulation software
Simulation model is found in construction in a systematic way；Wherein, the simulation software can be CDEGS simulation software, and the simulation model may include ground connection
Pole model, ground electrode circuit model, converter station ground grid model and tower grounding mounted cast.
Preferably, the default operating condition is that One Common Earthing Electrode one returns direct current monopole the earth operation, and another time direct current connects
Earth polar route is in inspecting state.Specifically, when a direct current grounding pole line maintenance, i.e., on the ground electrode circuit
When m base shaft tower is overhauled, ground electrode circuit is in ground connection and the state that is connected with earth mat in converter station.Wherein, the m base shaft
Tower is any shaft tower on the ground electrode circuit, can be head end shaft tower, is also possible to end shaft tower.
In an alternative embodiment, it when the m base shaft tower is when in earthing pole a certain range, need to be grounded
The shaft tower of polar curve road first and end hangs continuous earth line, and needs to hang temporary ground wire in the m base shaft tower.
In an alternative embodiment, when the m base shaft tower is not when in earthing pole a certain range, only need
Continuous earth line is hung in the shaft tower of ground electrode circuit first and end, does not need to resuspend temporary ground wire.
Preferably, range described in the present embodiment can be 10 kilometers.Further, using the simulation model, to described
The direct current transportation One Common Earthing Electrode system after m base shaft tower installing temporary ground wire is emulated, i.e., in ground electrode circuit
On have three base shaft towers suspension ground line, obtain the m base shaft tower and pick up flowing through ground electrode circuit and finally flowing into converter station earth mat
DC current.
S12, according to it is described flow into converter station earth mat electric current, calculate converter station single transformer bias current.
Preferably, the converter station single transformer bias current is calculated according to the following formula:
It=KIn/n
Wherein, ItFor the converter station single transformer bias current, K is that converter station earth mat electric current inflow transformer is neutral
The diverting coefficient of point, InFor the electric current for flowing into converter station earth mat, n is transformer station high-voltage side bus number of units.
It is appreciated that the DC current major part of grounded polar curve road inflow converter station earth mat is in converter station in transformer
Property point enters AC system, causes converter station transformer DC magnetic bias phenomenon.Therefore, the grounded pole line flows obtained by emulation
The converter station single transformer bias electricity when the m base shaft tower hangs and is grounded is calculated in the electric current for entering converter station earth mat
Stream.
S13, when detecting that the converter station single transformer bias current is greater than predetermined current threshold, then to described straight
The default shaft tower of the ground electrode circuit of stream transmission of electricity One Common Earthing Electrode system installs temporary ground wire, and uses the emulation mould again
Type emulates the direct current transportation One Common Earthing Electrode system after temporary ground wire is added, until the converter station separate unit after emulation becomes
Depressor bias current is not more than the predetermined current threshold.
Preferably, judge whether the ground electrode circuit of the direct current transportation One Common Earthing Electrode system needs as follows
It takes measures:
Judge whether the converter station single transformer bias current is greater than predetermined current threshold；If the converter station separate unit
Transformer bias electric current is not more than the predetermined current threshold, then judges the ground electrode circuit without taking measures；If described
Converter station single transformer bias current is greater than the predetermined current threshold, then judges to need in the default of the ground electrode circuit
Shaft tower installs temporary ground wire.
Preferably, the predetermined current threshold may be configured as 10A in the present embodiment.
In an alternative embodiment, when the converter station single transformer bias current is not more than the predetermined current threshold
When, then judge the ground electrode circuit of the direct current transportation One Common Earthing Electrode system without taking maintenance measure.
Preferably, it is emulated after the m base shaft tower hangs temporary ground wire, the converter station separate unit being calculated becomes
Depressor bias current is without departing from predetermined current threshold 10A, without taking measures to the ground electrode circuit, such as installs temporary grounding
Line.
In another alternative embodiment, when the converter station single transformer bias current is greater than the predetermined current threshold
When, then judge to need to install temporary ground wire in the default shaft tower of the ground electrode circuit.
Preferably, it is emulated after the m base shaft tower hangs temporary ground wire, the converter station separate unit being calculated becomes
When depressor bias current is without departing from predetermined current threshold 10A, at the scene actual DC transmission of electricity One Common Earthing Electrode system earthing pole
It needs to increase suspension ground line to the shaft tower of the ground electrode circuit when line maintenance, it can be understood as in the ground electrode circuit
Increase grounding point.
Further, in an alternative embodiment, step S13 specifically:
When detecting that the converter station single transformer bias current is greater than the predetermined current threshold, based on described the
M base shaft tower installs temporary ground wire, installs temporary ground wire close to the shaft tower of converter station in the ground electrode circuit, and again
The direct current transportation One Common Earthing Electrode system after temporary ground wire is added is emulated using the simulation model, until after emulation
Converter station single transformer bias current be not more than the predetermined current threshold.
It is overhauled it is appreciated that taking measures to be included in the m base shaft tower, i.e., the described m base shaft tower suspension ground connection
In the case where line, temporary ground wire is installed close to the shaft tower of converter station in the ground electrode circuit, i.e. increase grounding point.Specifically
The shaft tower nearest apart from converter station is set as ground electrode circuit head end shaft tower in the present embodiment, by distance in ground electrode circuit by ground
The nearest shaft tower of earthing pole is set as ground electrode circuit end shaft tower.It is connect from the shaft tower nearest apart from ground electrode circuit first section shaft tower is past
Ground extreme direction starts to install temporary ground wire one by one, and executes after once-through operation using the simulation model to adding temporary grounding
Direct current transportation One Common Earthing Electrode system after line is emulated, until when the m base shaft tower that emulation obtains hangs temporary ground wire
Converter station single transformer bias current is not more than the predetermined current threshold, stops installing interim hanging earthing conductor, and can be by imitating
True number determines the shaft tower quantity of suspension temporary ground wire.
Further, in an alternative embodiment, step S13 specifically:
When detecting that the converter station single transformer bias current is greater than the predetermined current threshold, based on described the
M base shaft tower installs temporary ground wire, installs temporary ground wire to the shaft tower for being located at the ground electrode circuit interlude, and adopt again
The direct current transportation One Common Earthing Electrode system after temporary ground wire is added is emulated with the simulation model, until after emulation
Converter station single transformer bias current is not more than the predetermined current threshold.
It is overhauled it is appreciated that taking measures to be included in the m base shaft tower, i.e., the described m base shaft tower suspension ground connection
In the case where line, temporary ground wire is installed to the shaft tower of the ground electrode circuit interlude, i.e., at ground electrode circuit midpoint and past
The left and right ends at midpoint increase grounding point.Specifically, it is opened from the shaft tower of the ground electrode circuit midpoint toward described in the both ends of midpoint
Begin suspension ground line, and is shared using the simulation model to the direct current transportation after adding temporary ground wire after executing once-through operation
Ground electrode system is emulated, until converter station separate unit transformation when the m base shaft tower that emulation obtains hangs temporary ground wire
Device bias current is not more than the predetermined current threshold, stops installing interim hanging earthing conductor, and can determine suspension by simulation times
The shaft tower quantity of temporary ground wire.
A kind of direct current transportation One Common Earthing Electrode system overhaul method provided in an embodiment of the present invention, by using presetting
Simulation model direct current transportation One Common Earthing Electrode system is emulated, obtain flowing into converter station earth mat under default operating condition
Electric current calculates converter station single transformer bias current according to the electric current for flowing into converter station earth mat, when detecting described change
When stream station single transformer bias current is greater than predetermined current threshold, then to the ground connection of the direct current transportation One Common Earthing Electrode system
The default shaft tower on polar curve road installs temporary ground wire, and again using the simulation model to the direct current after temporary ground wire is added
Transmission of electricity One Common Earthing Electrode system is emulated, until the converter station single transformer bias current after emulation is default no more than described
Current threshold plays shunting function using in ground electrode circuit installing temporary ground wire, flows into converter station earth mat electricity to reduce
Stream, the influence that converter station generates when shared earthing pole can be effectively reduced to earthing pole line maintenance guarantee personnel when maintenance and set
Standby safety.
In another preferred embodiment, on the basis of the above embodiments, by above-mentioned direct current transportation One Common Earthing Electrode system
Repair method is applied to include ichthyosauru ridge One Common Earthing Electrode, Chu Sui direct current fringe east side ground electrode circuit, fringe east converter station earth mat
Direct current transportation One Common Earthing Electrode system.As an example, the Chu Sui direct current fringe east side ground electrode circuit is equipped with 209 base shaft towers.
Using CDEGS simulation software to ichthyosauru ridge One Common Earthing Electrode, Chu Sui direct current fringe east side ground electrode circuit, the change of current of fringe east
Stand earth mat, tower grounding device is modeled, obtain earthing pole model, ground electrode circuit model, converter station ground grid model and
Tower grounding mounted cast.
Wherein, current operating condition is that a DC transmission system is that Xingan's direct current monopole the earth is run in One Common Earthing Electrode
That is 3000A, another DC transmission system are that fringe east side ground electrode circuit is in inspecting state.It is grounded when overhauling the fringe east side
When polar curve road, in the ground electrode circuit head end shaft tower 1#, (ground electrode circuit head end is ground electrode circuit in the present embodiment first
Close to converter station end), end shaft tower 209# hang continuous earth line, after need to be in a certain bar in 10 kilometer range of earthing pole
Tower hangs temporary ground wire.Preferably, 184#-209# shaft tower is overhauled in the present embodiment.
It calculates Xingan's direct current monopole the earth operation i.e. 3000A electric current and enters ground, fringe east side ground connection through ichthyosauru ridge One Common Earthing Electrode
When the line maintenance of pole, shaft tower is picked up and grounded polar curve road flows into the electric current I of fringe east converter station earth matn.According to formula It=K
In/ n, wherein K value is that 0.9, n value is 12, and fringe east converter station single transformer bias current I is calculatedt。
It referring to fig. 2, is the schematic diagram for the converter station single transformer bias current that one embodiment of the invention provides, it is right respectively
184#-209# shaft tower is installed temporary ground wire one by one and is emulated respectively, when each shaft tower suspension temporary ground wire is calculated
Converter station single transformer bias current.Predetermined current threshold described in the present embodiment is 10A.As shown in Fig. 2, converter station separate unit
Transformer bias electric current is greater than 10A, need to take measures to ground electrode circuit, when overhauling 208# shaft tower, single transformer bias
Electric current is maximum.The case where the present embodiment selection 184# shaft tower is overhauled is illustrated.
It is the increase grounding point in direct current transportation One Common Earthing Electrode system that one embodiment of the invention provides referring to Fig. 3
Schematic diagram, the shaft tower close to converter station earth mat are 1# shaft tower, and the shaft tower close to ichthyosauru ridge One Common Earthing Electrode is 209# shaft tower, to fringe
Shaft tower between the 1# shaft tower and 209# shaft tower of east side ground electrode circuit hangs ground line, can be increased grounding point.
Referring to fig. 4, be one embodiment of the invention provide ground electrode circuit close to converter station end install temporary ground wire
When bias current curve schematic diagram, 208# shaft tower hang be grounded on the basis of, with close to converter station ground connection count
The increase of amount, the variation of fringe east converter station single transformer bias current.Specifically, since 1# shaft tower hangs continuous earth line,
By base hanging earthing conductor since the 2# shaft tower at the nearly converter station end of ground electrode circuit.As shown in figure 3, when increasing to grounding point at 8, i.e.,
When hanging ground line to 2# to 9# shaft tower, simulation result is that single transformer bias current is less than 10A in the converter station of fringe east, is completed
Maintenance to 208# shaft tower.
Referring to Fig. 5, bias electricity when being the ground electrode circuit interlude installing temporary ground wire of one embodiment of the invention offer
The schematic diagram of flow curve, on the basis of 208# shaft tower hangs and is grounded, with the increase of grounding point quantity, fringe east converter station list
The variation of platform transformer bias electric current.The measure that another kind is taken is to hang to be grounded in fringe east side ground electrode circuit interlude,
As shown in Figure 4 when hanging ground line in 95#, 96# and 97# shaft tower, that is, increase grounding point at 3, simulation result is the change of current of fringe east
Single transformer bias current is less than 10A in standing, and completes the maintenance to 208# shaft tower.
It is provided in an embodiment of the present invention that direct current transportation One Common Earthing Electrode system overhaul method is applied in actual electric network.It adopts
It can effectively and easily realize that reduction part shares earthing pole pair in the case where being not necessarily to increase extras with the method
The influence that converter station generates when ground electrode circuit overhauls, can be effectively ensured direct current system and run with security and stability, and the method
It is easy to accomplish.
It is a kind of knot for direct current transportation One Common Earthing Electrode system overhaul device that one embodiment of the invention provides referring to Fig. 6
Structure schematic diagram, comprising:
Emulation module 1, for calculating converter station single transformer bias electricity according to the electric current for flowing into converter station earth mat
Stream；
Computing module 2 calculates converter station separate unit for flowing into the electric current of converter station earth mat according to the grounded polar curve road
Transformer bias electric current；
Overhaul module 3, for when detect the converter station single transformer bias current be greater than predetermined current threshold when,
Temporary ground wire then is installed to the default shaft tower of the ground electrode circuit of the direct current transportation One Common Earthing Electrode system, and is used again
The simulation model emulates the direct current transportation One Common Earthing Electrode system after temporary ground wire is added, until changing after emulation
Stream station single transformer bias current is not more than the predetermined current threshold.
Preferably, which includes:
Continuous earth is traditional thread binding to set unit, the m for the ground electrode circuit when maintenance direct current transportation One Common Earthing Electrode system
When base shaft tower, continuous earth line is installed in the first base shaft tower of the ground electrode circuit and the n-th base shaft tower；Wherein, 1≤m≤n, n
For the shaft tower quantity of the ground electrode circuit；
First judging unit, for judging the m base shaft tower whether apart from direct current transportation One Common Earthing Electrode system
In the preset range of the earthing pole of system；If so, installing temporary ground wire in the m base shaft tower；If it is not, then without described
M base shaft tower installs temporary ground wire.
Model construction unit, for constructing simulation model according to the direct current transportation One Common Earthing Electrode system；
Setting unit, for the simulation model to be arranged with the default operating condition；Wherein, the default operating condition
Direct current monopole the earth operation, another time direct current grounding pole are returned for the One Common Earthing Electrode one of the direct current transportation One Common Earthing Electrode system
Route is in inspecting state；
Simulation unit, for use the simulation model, with to the m base shaft tower install temporary ground wire after described in
Direct current transportation One Common Earthing Electrode system is emulated, and the electric current for flowing into converter station earth mat is obtained.
Preferably, which includes:
Converter station single transformer bias current computing unit becomes for calculating the converter station separate unit according to the following formula
Depressor bias current:
It=KIn/n
Wherein, ItFor the converter station single transformer bias current, K is that converter station earth mat electric current inflow transformer is neutral
The diverting coefficient of point, InFor the electric current for flowing into converter station earth mat, n is transformer station high-voltage side bus number of units.
Preferably, which includes:
Second judgment unit, for judging whether the converter station single transformer bias current is greater than predetermined current threshold
Value；If the converter station single transformer bias current is not more than the predetermined current threshold, the ground electrode circuit is judged
Without taking measures；If the converter station single transformer bias current is greater than the predetermined current threshold, judge to need
The default shaft tower of the ground electrode circuit installs temporary ground wire.
Preferably, the maintenance module 3 further include:
First maintenance unit detects that the converter station single transformer bias current is greater than the predetermined current for working as
When threshold value, temporary ground wire is installed based on the m base shaft tower, is installed in the ground electrode circuit close to the shaft tower of converter station
Temporary ground wire, and again using the simulation model to be added temporary ground wire after direct current transportation One Common Earthing Electrode system into
Row emulation, until the converter station single transformer bias current after emulation is not more than the predetermined current threshold；
Second maintenance unit detects that the converter station single transformer bias current is greater than the predetermined current for working as
When threshold value, temporary ground wire is installed based on the m base shaft tower, the shaft tower installing for being located at the ground electrode circuit interlude is faced
When be grounded, and again using the simulation model to be added temporary ground wire after direct current transportation One Common Earthing Electrode system carry out
Emulation, until the converter station single transformer bias current after emulation is not more than the predetermined current threshold.
It is a kind of knot for direct current transportation One Common Earthing Electrode system overhaul device that one embodiment of the invention provides referring to Fig. 6
Structure schematic diagram.The direct current transportation One Common Earthing Electrode system overhaul device of the embodiment includes: processor, memory and is stored in
In the memory and the computer program that can run on the processor.When the processor executes the computer program
Realize the step in above-mentioned each direct current transportation One Common Earthing Electrode system overhaul embodiment of the method, such as step S13 shown in FIG. 1
When detecting that the converter station single transformer bias current is greater than predetermined current threshold, then the direct current transportation is shared and connect
The default shaft tower of the ground electrode circuit of ground electrode systems installs temporary ground wire, and again interim to being added using the simulation model
Direct current transportation One Common Earthing Electrode system after ground line is emulated, until the converter station single transformer bias current after emulation
No more than the predetermined current threshold.Alternatively, the processor realizes that above-mentioned each device is implemented when executing the computer program
The function of each module/unit in example, such as maintenance module 3, detect the converter station single transformer bias current for working as
When greater than predetermined current threshold, then the default shaft tower installing of the ground electrode circuit of the direct current transportation One Common Earthing Electrode system is faced
When be grounded, and again using the simulation model to be added temporary ground wire after direct current transportation One Common Earthing Electrode system carry out
Emulation, until the converter station single transformer bias current after emulation is not more than the predetermined current threshold.
Illustratively, the computer program can be divided into one or more module/units, one or more
A module/unit is stored in the memory, and is executed by the processor, to complete the present invention.It is one or more
A module/unit can be the series of computation machine program instruction section that can complete specific function, and the instruction segment is for describing institute
State implementation procedure of the computer program in the direct current transportation One Common Earthing Electrode system overhaul device.
The direct current transportation One Common Earthing Electrode system overhaul device can be desktop PC, notebook, palm PC
And cloud server etc. calculates equipment.The direct current transportation One Common Earthing Electrode system overhaul device may include, but be not limited only to, place
Manage device, memory.It will be understood by those skilled in the art that the schematic diagram is only direct current transportation One Common Earthing Electrode system overhaul
The example of device does not constitute the restriction to direct current transportation One Common Earthing Electrode system overhaul device, may include more than illustrating
Or less component, perhaps combine certain components or different components, such as direct current transportation One Common Earthing Electrode system inspection
Repairing device can also include input-output equipment, network access equipment, bus etc..
Alleged processor can be central processing unit (Central Processing Unit, CPU), can also be it
His general processor, digital signal processor (Digital Signal Processor, DSP), specific integrated circuit
(Application Specific Integrated Circuit, ASIC), ready-made programmable gate array (Field-
Programmable Gate Array, FPGA) either other programmable logic device, discrete gate or transistor logic,
Discrete hardware components etc..General processor can be microprocessor or the processor is also possible to any conventional processor
Deng the processor is the control centre of the direct current transportation One Common Earthing Electrode system overhaul device, utilizes various interfaces and line
Road connects the various pieces of entire direct current transportation One Common Earthing Electrode system overhaul device.
The memory can be used for storing the computer program and/or module, and the processor is by operation or executes
Computer program in the memory and/or module are stored, and calls the data being stored in memory, described in realization
The various functions of direct current transportation One Common Earthing Electrode system overhaul device.The memory can mainly include storing program area and storage
Data field, wherein storing program area can application program needed for storage program area, at least one function (for example sound plays
Function, image player function etc.) etc.；Storage data area, which can be stored, uses created data (such as audio number according to mobile phone
According to, phone directory etc.) etc..In addition, memory may include high-speed random access memory, it can also include non-volatile memories
Device, such as hard disk, memory, plug-in type hard disk, intelligent memory card (Smart Media Card, SMC), secure digital (Secure
Digital, SD) card, flash card (Flash Card), at least one disk memory, flush memory device or other volatibility are solid
State memory device.
Wherein, if the integrated module/unit of the direct current transportation One Common Earthing Electrode system overhaul device is with software function
The form of unit is realized and when sold or used as an independent product, can store in a computer-readable storage medium
In.Based on this understanding, the present invention realizes all or part of the process in above-described embodiment method, can also pass through computer
Program is completed to instruct relevant hardware, and the computer program can be stored in a computer readable storage medium, should
Computer program is when being executed by processor, it can be achieved that the step of above-mentioned each embodiment of the method.Wherein, the computer program
Including computer program code, the computer program code can be source code form, object identification code form, executable file
Or certain intermediate forms etc..The computer-readable medium may include: can carry the computer program code any
Entity or device, recording medium, USB flash disk, mobile hard disk, magnetic disk, CD, computer storage, read-only memory (ROM, Read-
Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and
Software distribution medium etc..It should be noted that the content that the computer-readable medium includes can be according in jurisdiction
Legislation and the requirement of patent practice carry out increase and decrease appropriate, such as in certain jurisdictions, according to legislation and patent practice, meter
Calculation machine readable medium does not include electric carrier signal and telecommunication signal.
It should be noted that the apparatus embodiments described above are merely exemplary, wherein described be used as separation unit
The unit of explanation may or may not be physically separated, and component shown as a unit can be or can also be with
It is not physical unit, it can it is in one place, or may be distributed over multiple network units.It can be according to actual
It needs that some or all of the modules therein is selected to achieve the purpose of the solution of this embodiment.In addition, device provided by the invention
In embodiment attached drawing, the connection relationship between module indicate between them have communication connection, specifically can be implemented as one or
A plurality of communication bus or signal wire.Those of ordinary skill in the art are without creative efforts, it can understand
And implement.
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 transportation One Common Earthing Electrode system overhaul method characterized by comprising
Direct current transportation One Common Earthing Electrode system is emulated using pre-set simulation model, is obtained under default operating condition
Flow into the electric current of converter station earth mat；
According to the electric current for flowing into converter station earth mat, converter station single transformer bias current is calculated；
It is when detecting that the converter station single transformer bias current is greater than predetermined current threshold, then total to the direct current transportation
Temporary ground wire is installed with the default shaft tower of the ground electrode circuit of ground electrode system, and again using the simulation model to addition
Direct current transportation One Common Earthing Electrode system after temporary ground wire is emulated, until the converter station single transformer bias after emulation
Electric current is not more than the predetermined current threshold.
2. direct current transportation One Common Earthing Electrode system overhaul method as described in claim 1, which is characterized in that described using pre-
The simulation model being first arranged emulates direct current transportation One Common Earthing Electrode system, obtains flowing into converter station under default operating condition
Before the electric current of earth mat, specifically include:
When overhauling the m base shaft tower of ground electrode circuit of direct current transportation One Common Earthing Electrode system, in the ground electrode circuit
First base shaft tower and the n-th base shaft tower install continuous earth line；Wherein, 1≤m≤n, n are the shaft tower quantity of the ground electrode circuit；
Judge the m base shaft tower whether the earthing pole apart from the direct current transportation One Common Earthing Electrode system preset range
It is interior；If so, installing temporary ground wire in the m base shaft tower；If it is not, then without temporarily being connect in m base shaft tower installing
Ground wire.
3. direct current transportation One Common Earthing Electrode system overhaul method as claimed in claim 2, which is characterized in that described using preparatory
The simulation model of setting emulates direct current transportation One Common Earthing Electrode system, obtains under default operating condition with flowing into converter station
The electric current of net, specifically includes:
According to the direct current transportation One Common Earthing Electrode system, simulation model is constructed；
With the default operating condition, the simulation model is set；Wherein, the default operating condition is total for the direct current transportation
It returns direct current monopole the earth with the One Common Earthing Electrode one of ground electrode system to run, another time direct current grounding pole route is in maintenance shape
State；
Using the simulation model, ground connection is shared to install the direct current transportation after temporary ground wire to the m base shaft tower
Electrode systems are emulated, and the electric current for flowing into converter station earth mat is obtained.
4. direct current transportation One Common Earthing Electrode system overhaul method as described in claim 1, which is characterized in that described according to
The electric current of converter station earth mat is flowed into, converter station single transformer bias current is calculated, specifically includes:
The converter station single transformer bias current is calculated according to formula (1):
It=KIn/n(1)
Wherein, ItFor the converter station single transformer bias current, K is converter station earth mat electric current inflow transformer neutral point
Diverting coefficient, InFor the electric current for flowing into converter station earth mat, n is transformer station high-voltage side bus number of units.
5. direct current transportation One Common Earthing Electrode system overhaul method as claimed in claim 2, which is characterized in that as follows
Judge whether the ground electrode circuit of the direct current transportation One Common Earthing Electrode system needs to take measures:
Judge whether the converter station single transformer bias current is greater than predetermined current threshold；If the converter station separate unit transformation
Device bias current is not more than the predetermined current threshold, then judges the ground electrode circuit without taking measures；If the change of current
Single transformer bias current of standing is greater than the predetermined current threshold, then judges to need the default shaft tower in the ground electrode circuit
Install temporary ground wire.
6. direct current transportation One Common Earthing Electrode system overhaul method as claimed in claim 5, which is characterized in that described to detect
When the converter station single transformer bias current is greater than predetermined current threshold, then to the direct current transportation One Common Earthing Electrode system
Ground electrode circuit default shaft tower install temporary ground wire, and again using the simulation model to be added temporary ground wire after
Direct current transportation One Common Earthing Electrode system emulated, until emulation after converter station single transformer bias current be not more than institute
Predetermined current threshold is stated, is specifically included:
When detecting that the converter station single transformer bias current is greater than the predetermined current threshold, it is based on the m base
Shaft tower installs temporary ground wire, installs temporary ground wire close to the shaft tower of converter station in the ground electrode circuit, and adopt again
The direct current transportation One Common Earthing Electrode system after temporary ground wire is added is emulated with the simulation model, until after emulation
Converter station single transformer bias current is not more than the predetermined current threshold.
7. direct current transportation One Common Earthing Electrode system overhaul method as claimed in claim 5, which is characterized in that described to detect
When the converter station single transformer bias current is greater than predetermined current threshold, then to the direct current transportation One Common Earthing Electrode system
Ground electrode circuit default shaft tower install temporary ground wire, and again using the simulation model to be added temporary ground wire after
Direct current transportation One Common Earthing Electrode system emulated, until emulation after converter station single transformer bias current be not more than institute
Predetermined current threshold is stated, specifically further include:
When detecting that the converter station single transformer bias current is greater than the predetermined current threshold, it is based on the m base
Shaft tower installs temporary ground wire, installs temporary ground wire to the shaft tower for being located at the ground electrode circuit interlude, and use again
The simulation model emulates the direct current transportation One Common Earthing Electrode system after temporary ground wire is added, until changing after emulation
Stream station single transformer bias current is not more than the predetermined current threshold.
8. a kind of direct current transportation One Common Earthing Electrode system overhaul device characterized by comprising
Emulation module is obtained for being emulated using pre-set simulation model to direct current transportation One Common Earthing Electrode system
The electric current of converter station earth mat is flowed under default operating condition；
Computing module, for calculating converter station single transformer bias current according to the electric current for flowing into converter station earth mat；
Overhaul module, for when detect the converter station single transformer bias current be greater than predetermined current threshold when, then it is right
The default shaft tower of the ground electrode circuit of the direct current transportation One Common Earthing Electrode system installs temporary ground wire, and again using described
Simulation model emulates the direct current transportation One Common Earthing Electrode system after temporary ground wire is added, until the converter station after emulation
Single transformer bias current is not more than the predetermined current threshold.
9. a kind of direct current transportation One Common Earthing Electrode system overhaul device, including processor, memory and it is stored in the storage
In device and it is configured as the computer program executed by the processor, the processor is realized when executing the computer program
Direct current transportation One Common Earthing Electrode system overhaul method as claimed in any of claims 1 to 7 in one of claims.
10. a kind of computer readable storage medium, which is characterized in that the computer readable storage medium includes the calculating of storage
Machine program, wherein equipment where controlling the computer readable storage medium in computer program operation is executed as weighed
Benefit require any one of 1 to 7 described in direct current transportation One Common Earthing Electrode system overhaul method.
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| CN201910104882.9A CN109873346B (en) | 2019-02-01 | 2019-02-01 | DC power transmission common grounding electrode system maintenance method and device |
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| CN109873346B CN109873346B (en) | 2020-08-18 |
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| CN109873346B (en) | 2020-08-18 |
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