CN106602520B - A kind of self-adapting correction method of earthing pole bus differential protecting - Google Patents
A kind of self-adapting correction method of earthing pole bus differential protecting Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/226—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for wires or cables, e.g. heating wires
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Abstract
A kind of self-adapting correction method of earthing pole bus differential protecting of the present invention, including step：Judge earthing pole bus differential protecting with the presence or absence of difference current；If being judged as YES, difference current I is obtaineddiffAnd compare difference current IdiffAbsolute value and preset electric current threshold value Δ；As difference current IdiffAbsolute value be greater than electric current threshold value Δ when enter correcting logic; and uneven branch is judged by the earthing pole bus differential protecting state recognition signal condition feature under DC transmission system difference operating condition, and then processing is corrected to uneven branch.Pass through the logic judgment and current correction to uneven branch; the difference stream adaptively correcting identified based on current characteristic is realized in state recognition dropout; the true operating status of effective identification system; both it had prevented from carrying out false protection caused by beam works because of maintenance pole; false protection avoid because of state recognition dropout again caused by improves the correctness of direct current protecting movement.
Description
Technical field
The present invention relates to technical field of HVDC transmission, in particular to a kind of earthing pole bus differential protecting it is adaptive
Bearing calibration.
Background technique
In high voltage direct current protection system, earthing pole bus differential protecting is mainly for detection of earthing pole bus and related guarantor
Protect the failure occurred in range.Since the method for operation of HVDC transmission system has BP (bipolar operation), GR, (monopole the earth is returned
Line) and a variety of methods of operation such as MR (monopolar metallic return), to prevent the false tripping in the beam work for carrying out maintenance pole from running
Pole, earthing pole bus differential protecting introduce state recognition signal as assistant criteria.When system running state changes,
State recognition signal is corresponded by logic judgment set and with running state, thus open in difference stream operation
Or locking measurement of correlation amount, it is ensured that the correctness of difference stream operation.Therefore, the correctness of state recognition signal judgement directly determines
The reliability of earthing pole bus differential protecting movement.In existing direct current protecting software logic, earthing pole bus differential is protected
The difference of shield flows total formula：
Idiff=| | IdLN-S1×IdLN_op|-|S2×IdLH_op-S3×(Idee1+Idee2)-S4×IdSG||
(formula 1)
In above formula, S1-S4 is state recognition signal.IdLN is this pole neutral bus electric current, and IdSG is that ground connection is opened in station
Powered-down stream, Idee1, Idee2 are respectively two ground electrode circuit electric currents, and IdLN_op is to pole neutral bus electric current, IdLH_op
For to pole DC line electric current.
As S1=1, open IdLN_op participates in difference stream operation；As S2=1, open IdLH_op participates in difference stream operation；
As S3=1, open (Idee1+Idee2) participates in difference stream operation；As S4=1, open IdSG participates in difference stream operation.S1-S4
Decision logic it is as shown in Figs. 1-2.
The original intention that earthing pole bus differential protecting introduces state recognition signal is for effective identifying system operating status, drop
The risk of false protection when beam work is carried out in low maintenance pole.Under monopole operating mode, if carrying out beam examination to maintenance pole
It tests, if adoption status identification signal not may cause false protection.Such as：Carry out 2 DC line CT of pole under the 1GR mode of pole
The beam of (IdLH_op measurement amount) is tested, and set is by the decision logic of state recognition signal S2, S2 according to Fig.2, at this time
0, IdLH_op will not be included in difference stream operation by formula (1)；If not adoption status identification signal, protection will IdLH_op meter
Enter differential current computing, protection misoperation may cause to the beam of the current measure device.Therefore, if to be grounded pole bus
The calculating of differential protection difference current is consistent with system operation mode, it is necessary to introduce state recognition signal as assistant criteria.
In actual motion, due to state recognition signal in terms of secondary circuit or decision logic there are unreliable factor,
Under system normal operating mode, once state recognition dropout (such as answering set originally is 1, practical accidentally set is 0), then to connect
The poor flow algorithm of earth polar bus differential protecting will be mismatched with running state, increase the general of false protection instead
Rate.
Summary of the invention
Embodiments of the present invention aim to solve at least one of the technical problems existing in the prior art.For this purpose, of the invention
Embodiment need to provide a kind of self-adapting correction method of earthing pole bus differential protecting.
The self-adapting correction method of the earthing pole bus differential protecting of embodiment of the present invention, includes the following steps：
Judge earthing pole bus differential protecting with the presence or absence of difference current；
If being judged as YES, difference current I is obtaineddiffAnd compare difference current IdiffAbsolute value and preset electric current door
Threshold value Δ；
As difference current IdiffAbsolute value enter correcting logic when being greater than electric current threshold value Δ, and pass through DC power transmission system
The earthing pole bus differential protecting state recognition signal condition feature united under different operating conditions judges uneven branch,
And then processing is corrected to uneven branch；
Wherein, difference current IdiffIt is calculated by following equation：
Idiff=| | IdLN-S1×IdLN_op|-|S2×IdLH_op-S3×(Idee1+Idee2)-S4×IdSG||
S1、S2、S3And S4For state recognition signal, IdLN is this pole neutral bus electric current, and IdSG is earthing switch electricity in standing
Stream, Idee1, Idee2 are respectively two ground electrode circuit electric currents, and it is pair that IdLN_op, which is to pole neutral bus electric current, IdLH_op,
Pole DC line electric current.
The self-adapting correction method of the earthing pole bus differential protecting of embodiment of the present invention, by uneven branch
Logic judgment and current correction can realize the adaptive school of difference stream identified based on current characteristic in state recognition dropout
Just, the true operating status of effective identification system can not only prevent from carrying out false protection caused by beam works because of maintenance pole, but also can
The correctness of direct current protecting movement is greatly improved in false protection caused by avoiding because of state recognition dropout.
The advantages of additional aspect of the invention, will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
The above-mentioned and/or additional aspect and advantage of embodiments of the present invention are from combination following accompanying drawings to embodiment
It will be apparent and be readily appreciated that in description, wherein：
Fig. 1 is the flow diagram of the self-adapting correction method of the earthing pole bus differential protecting of embodiment of the present invention；
Fig. 2 is the correcting logic signal of the self-adapting correction method of the earthing pole bus differential protecting of embodiment of the present invention
Figure.
Specific embodiment
Embodiments of the present invention are described below in detail, the example of embodiment is shown in the accompanying drawings, wherein identical or class
As label indicate same or similar element or element with the same or similar functions from beginning to end.Below with reference to attached
The embodiment of figure description is exemplary, and can only be used to explain embodiments of the present invention, and should not be understood as to the present invention
Embodiment limitation.
Referring to Fig. 1, the self-adapting correction method of the earthing pole bus differential protecting of embodiment of the present invention.
In this embodiment, for the execution object using DC protection system as step.
According to kirchhoff electric current law of conservation, if state recognition signal is all correctly and without the system failure, earthing pole
The sum of electric current inflow, outflow are theoretically zero in the protection scope of bus differential protecting, i.e. difference current Idiff=0；Work as development
When beam is tested, since beam amount is unrelated with primary system, difference stream operation does not have spill current equally；And when system operates normally
When state recognition dropout or physical fault occurs for system when normal state recognition signal, this time difference, which will flow operation, to be occurred
Spill current.Using this feature, the entrance principle of correcting logic can be specified.
The poor electric current threshold value for flowing population equilibrium state is Δ to the definition of this place for identification.Difference current using formula 1 into
Row calculates, if difference current IdiffAbsolute value be greater than threshold value Δ, then determine state recognition dropout at this time or system hair
Raw failure, into correcting logic；If difference current IdiffAbsolute value be less than threshold value Δ, then determine state recognition signal at this time
Normal and system fault-free, does not enter correcting logic.
Threshold value for determining that branch has load current is：
S1The corresponding branch threshold value of signal is Δ1；S2The corresponding branch threshold value of signal is Δ2；S3The corresponding branch of signal
Road threshold value is Δ3。
The feature of state recognition dropout is under system normal operation：Branch has load current, but corresponding shape
It is 0 that state identification signal, which is lost,.It therefore, can be based on this feature to losing in the case where an only state recognition dropout
The operating status for losing the uneven branch of state recognition signal is corrected processing.When system operates normally, under each method of operation
Corresponding state recognition signal such as the following table 1：
State recognition signal when 1 system of table operates normally
According to upper table, when state recognition signal occur and being 0 and correspond to branch and have the phenomenon that load current, there are following
Several possibility：
1, under MR mode, S2=0, the corresponding branch of IdLH_op has load current：Under MR mode, when normal operation, should be S2
=1, the corresponding branch of IdLH_op has load current, therefore the situation meets state recognition dropout when system operates normally
Condition, should be corrected；
2, under GR mode, S3=0, the corresponding branch of Idee1 and Idee2 has load current：Under GR mode, when normal operation
It should be S3=1, the corresponding branch of Idee1 and Idee2 has load current, therefore the situation meets state when system operates normally and knows
The condition that level signal is lost, should be corrected；
3, under BP mode, S1=0, the corresponding branch of IdLN_op has load current：Under BP mode, when normal operation, should be S1
=1, the corresponding branch of IdLN_op has load current, therefore the situation meets state recognition dropout when system operates normally
Condition, should be corrected；
4, under BP mode, S3=0, the corresponding branch of Idee1 and Idee2 has load current：Under BP mode, when normal operation
It should be S3=1, the corresponding branch of Idee1 and Idee2 has load current, therefore the situation meets state when system operates normally and knows
The condition that level signal is lost, should be corrected；
5, under BP mode, S2=0, the corresponding branch of IdLH_op has load current：Under BP mode, as S when normal operation2
=0, the corresponding branch of IdLH_op has load current, therefore the situation belongs to normal condition, should not be corrected.
6, under MR mode, S4=0, the corresponding branch of IdSG has load current：Due to S under MR mode4The corresponding high speed of branch
Switch is in coincidence, but there is no IdSG electric currents to flow through when system normal operation, and ability when ground fault occurs only under MR mode
IdSG electric current is had, therefore to S4Branch does not consider to be corrected.
As seen from the above analysis, when there is S2=0, when the corresponding branch of IdLH_op has the case where load current, Ke Nengwei
Two kinds of operating statuses are coped with both states and are distinguished, and determine whether for the branch to be corrected：1) under MR mode, S2
=0, the corresponding branch of IdLH_op has load current to belong to state recognition dropout, should correct；2) under BP mode, S2=0,
The corresponding branch of IdLH_op has load current to belong to normal condition, should not correct.Further analytical table 1 is it is found that S under MR mode2
When state recognition dropout, S1、S3It is 0；And S under BP mode2When being 0, S1、S3It is 1.
When system is under BP, MR or GR steady preview roadway, if state recognition signal is also normal, | Idiff|<Δ,
Correcting logic will not be entered.
When system is under steady preview roadway, if state recognition dropout, | Idiff|>Δ is patrolled into correction
Volume, and then uneven branch is judged whether there is, off-note is that branch has stream and stateless identification signal.
1) for state recognition signal S1、S3Corresponding branch, if there is having branch current and stateless identification signal
Phenomenon then forms S1=1 or S3=1, it substitutes into formula (1) and carries out difference stream operation, obtain new poor flow valuve Idiff'.If | Idiff’|<
Δ illustrates poor mobile equilibrium after correction, corrects successfully.Meanwhile alarm signal is issued, prompt operations staff's existence identification signal
The case where loss, need to be handled as early as possible.
2) for state recognition signal S2Corresponding branch, if there is there is showing for branch current and stateless identification signal
As then first judging S1With S3In whether any one be 1.If S1With S3Any one is 1, illustrates to be BP mode at this time, then without
Correction；If S1With S3It is 0, illustrates it is MR mode at this time, then form S2=1, it substitutes into formula (1) and carries out difference stream operation, obtain new
Poor flow valuve Idiff’。
And when system is under steady preview roadway, if carrying out the beam work of maintenance branch, | Idiff|<Δ, no
Correcting logic can be entered.
Embodiment 1
Specifically, the self-adapting correction method of earthing pole bus differential protecting proposed by the present invention, includes the following steps：
S1 judges earthing pole bus differential protecting with the presence or absence of difference current.The method of adaptively correcting is not suitable for
System breaks down and the case where state recognition dropout, the case where when the description of following scheme is operated normally both for system
To be unfolded to describe.
S2 obtains difference current I if being judged as YESdiffAnd compare difference current IdiffAbsolute value and preset electric current
Threshold value Δ.Wherein, difference current IdiffIt is calculated by following equation：
Idiff=| | IdLN-S1×IdLN_op|-|S2×IdLH_op-S3×(Idee1+Idee2)-S4×IdSG||
S1、S2、S3And S4For state recognition signal, IdLN is this pole neutral bus electric current, and IdSG is earthing switch electricity in standing
Stream, Idee1, Idee2 are respectively two ground electrode circuit electric currents, and it is pair that IdLN_op, which is to pole neutral bus electric current, IdLH_op,
Pole DC line electric current.
S3, as difference current IdiffAbsolute value be greater than electric current threshold value Δ when, shape of the DC protection system to each branch
State identification signal and branch current differentiate one by one, has branch current but stateless when determining the corresponding branch of state recognition signal
When identification signal, further pass through the earthing pole bus differential protecting state recognition letter under DC transmission system difference operating condition
Number state feature judges whether that the branch need to be corrected processing.For the branch for judging to have abnormal, such branch quilt
Uneven branch is regarded as, the specific method of correction is：Difference current is substituted into after the state recognition signal of the branch is negated
Calculation formula forms new poor flow valuve Idiff'；If Idiff' absolute value be less than threshold value Δ, then it is assumed that branch corrects successfully, this
Shi Caiyong new poor flow valuve Idiff' operation is carried out, it can also be simultaneously emitted by alarm signal, operations staff is prompted to handle；If
Idiff' absolute value be still greater than threshold value Δ, then it is assumed that branch correction is unsuccessful, still using poor flow valuve IdiffCarry out operation.It is whole
Correcting process figure is as shown in Figure 2.
Specifically, the operating status for the branch for being 0 to state recognition signal in S3 is corrected processing and includes：
Processing is corrected according to operating status of the steady preview roadway of system to uneven branch, wherein system
Steady preview roadway includes BP mode, GR mode or MR mode.I.e. under the steady preview roadway for determining system, and then to injustice
Weighing apparatus branch is corrected processing.
School is carried out to uneven branch according to state recognition signal characteristic of the system in BP, GR and MR steady preview roadway
Positive processing, the feature of systematic steady state run time behaviour identification signal are specially：When BP mode steady-state operation, S1=1, S2=0, S3
=1, S4=0；When GR mode steady-state operation, S1=0, S2=0, S3=1, S4=0；When MR mode steady-state operation, S1=0, S2=
1、S3=0, S4=1.
Specifically, on the basis of embodiment 1, as state recognition signal S1When being zero, to state recognition signal S1It is 0
Uneven branch is corrected processing：
S01 determines that there are S1Corresponding branch current IdLN_op；Determine that the branch has load current.
S02, the situation meet S when system operates normally1The condition of state recognition dropout should be corrected, to branch
Uneven branch where the electric current IdLN_op of road is corrected processing.
S03, with S1=1, which carries out difference stream operation, obtains new poor flow valuve Idiff'.As shown in Fig. 2, the state of the branch is known
Level signal substitutes into the calculation formula of difference current after negating, then forms S1'=1 simultaneously substitutes into formula new poor flow valuve is calculated
Idiff'.S herein1And S1' all refer to the same state recognition signal and corresponding same branch, but because the difference of assignment is for side
Just it states and is distinguished.
S04, when | Idiff'|<When Δ is set up, then correction pass signal and/or alarm signal are issued.If | Idiff'|<Δ is said
Poor mobile equilibrium, corrects successfully after bright correction.Meanwhile alarm signal is issued, prompt operations staff's existence identification signal to lose
The case where, it need to handle as early as possible.
Specifically, on the basis of embodiment 1, as state recognition signal S3It is S to state recognition signal when being zero3It is 0
Uneven branch be corrected processing and include：
S11 determines that there are S3Corresponding branch current Idee1 and Idee2；Determine that two branches have load electric
Stream.
S12, the situation meet state recognition signal S when system operates normally3The condition of loss should be corrected, to branch
The operating status of uneven branch where road electric current Idee1 and Idee2 is corrected processing.
S13, with S3=1, which carries out difference stream operation, obtains new poor flow valuve Idiff'.As shown in Fig. 2, the state of the branch is known
Level signal substitutes into the calculation formula of difference current after negating, then forms S3'=1 simultaneously substitutes into formula new poor flow valuve is calculated
Idiff'.S herein3And S3' all refer to the same state recognition signal and corresponding same branch, but because the difference of assignment is for side
Just it states and is distinguished.
S14, when | Idiff'|<When Δ is set up, then correction pass signal and/or alarm signal are issued.If | Idiff'|<Δ is said
Poor mobile equilibrium, corrects successfully after bright correction.Meanwhile alarm signal is issued, prompt operations staff's existence identification signal to lose
The case where, it need to handle as early as possible.
Specifically, on the basis of embodiment 1, as state recognition signal S2When being zero, to state recognition signal S2It is 0
Uneven branch is corrected processing：
S21 determines that there are S2Corresponding branch current IdLH_op；Determine that the branch has load current.
S22, for state recognition signal S2Corresponding branch, if there is having branch current and stateless identification signal
Phenomenon then first judges S1With S3In whether any one be 1.If S1With S3It is 0, which meets shape when system operates normally
The condition that state identification signal is lost, should be corrected, be corrected to the operating status of the branch where branch current IdLH_op
Processing；
S23 determines S1With S3With S when being 02=1, which carries out difference stream operation, obtains new poor flow valuve Idiff'；With S2=1 carries out
Difference stream operation obtains new poor flow valuve Idiff'.As shown in Fig. 2, substituting into differential electricity after the state recognition signal of the branch is negated
The calculation formula of stream, then form S2'=1 simultaneously substitutes into formula new poor flow valuve I is calculateddiff'.S herein2And S2' all refer to
The same state recognition signal and corresponding same branch, but be distinguished because of different state for convenience of assignment.
S24, when | Idiff'|<When Δ is set up, then correction pass signal and/or alarm signal are issued.
Specifically, on the basis of embodiment 1, as state recognition signal S2It is described to state recognition signal S when being zero2For
0 branch is corrected processing：
S31 determines that there are S2Corresponding branch current IdLH_op；Determine that the branch has load current.
S32, for state recognition signal S2Corresponding branch, if there is having branch current and stateless identification signal
Phenomenon then first judges S1With S3In whether any one be 1.If S1With S3Any one is 1, which meets system normal operation
Condition, then processing is not corrected to the operating status of the branch where branch current IdLH_op；
Specifically, on the basis of embodiment 1, as state recognition signal S4It is described to state recognition signal S when being zero4For
0 branch is corrected processing：
S41 is not corrected processing to the correspondence branch where branch current IdSG under MR mode.Due to S under MR mode4
The corresponding high-speed switch of branch is in coincidence, but there is no IdSG electric currents to flow through when system normal operation, and only MR mode issues
IdSG electric current is just had when raw ground fault, therefore to S4Corresponding branch does not consider to be corrected.
In conclusion the feature of state recognition dropout is under system normal operation：Branch has load current, but
Corresponding state recognition dropout is 0.Therefore, in the case where an only state recognition dropout, this can be based on
Feature is corrected processing to the operating status of lost condition identification signal branch.
When there is S2=0, when the corresponding branch of IdLH_op has the case where load current, it may be two kinds of operating statuses, answer
Both states are distinguished, and determine whether for the branch to be corrected.Further analysis shows that S under MR mode2State
When identification signal is lost, S1、S3It is 0；And S under BP mode2When being 0, S1、S3It is 1.Using this feature, area can be carried out
Point.
Into after correcting logic, protection differentiates the state recognition signal and branch current of each branch one by one, when determining
When having branch current but stateless identification signal, protection is attempted to calculate the poor stream of branch current substitution, forms new difference
Flow valuve Idiff'.If Idiff' absolute value be less than threshold value Δ, then it is assumed that branch corrects successfully；If Idiff' absolute value be greater than door
Threshold value Δ, then it is assumed that branch correction is unsuccessful.
In the prior art, false protection when carrying out beam work for effective identifying system operating status, reduction maintenance pole
Risk, earthing pole bus differential protecting introduce state recognition signal as assistant criteria.However since state recognition signal exists
There are unreliable factors in terms of secondary circuit or decision logic, under system normal operating mode, once state recognition signal is lost
It loses, then the poor flow algorithm of earthing pole bus differential protecting will be mismatched with running state, be increased protection instead and be missed
Dynamic probability.
The present invention proposes a kind of difference stream operation self-adapting correction method of earthing pole bus differential protecting, by imbalance
The logic judgment and current correction of branch can realize that the difference stream identified based on current characteristic is adaptive in state recognition dropout
It should correct, the true operating status of effective identification system, can both prevent from carrying out false protection caused by beam works because of maintenance pole,
The correctness of direct current protecting movement is greatly improved in false protection can avoid because of state recognition dropout again caused by.
In the description of embodiments of the present invention, it is to be understood that term " center ", " longitudinal direction ", " transverse direction ", " length
Degree ", " width ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner",
The orientation or positional relationship of the instructions such as "outside", " clockwise ", " counterclockwise " is to be based on the orientation or positional relationship shown in the drawings, only
It is embodiments of the present invention and simplified description for ease of description, rather than the device or element of indication or suggestion meaning are necessary
It with specific orientation, is constructed and operated in a specific orientation, therefore should not be understood as the limitation to embodiments of the present invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or imply
Indicate the quantity of indicated technical characteristic." first " is defined as a result, the feature of " second " can be expressed or impliedly wrap
Include one or more feature.In the description of embodiments of the present invention, the meaning of " plurality " is two or two
More than, unless otherwise specifically defined.
In the description of embodiments of the present invention, it should be noted that unless otherwise clearly defined and limited, term
" installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or one
Connect to body；It can be mechanical connection, be also possible to be electrically connected or can mutually communicate；It can be directly connected, can also lead to
It crosses intermediary to be indirectly connected, can be the connection inside two elements or the interaction relationship of two elements.For ability
For the those of ordinary skill in domain, can understand as the case may be above-mentioned term in embodiments of the present invention specifically contain
Justice.
In embodiments of the present invention unless specifically defined or limited otherwise, fisrt feature second feature it
"upper" or "lower" may include that the first and second features directly contact, may include the first and second features be not directly to connect yet
It touches but by the other characterisation contact between them.Moreover, fisrt feature second feature " on ", " top " and " on
Face " includes fisrt feature right above second feature and oblique upper, or to be merely representative of first feature horizontal height special higher than second
Sign.Fisrt feature include under the second feature " below ", " below " and " below " fisrt feature immediately below second feature and obliquely downward
Side, or first feature horizontal height is merely representative of less than second feature.
Following disclosure provides many different embodiments or example is used to realize embodiments of the present invention not
Same structure.In order to simplify the disclosure of embodiments of the present invention, hereinafter the component of specific examples and setting are described.When
So, they are merely examples, and is not intended to limit the present invention.In addition, embodiments of the present invention can be in different examples
Repeat reference numerals and/or reference letter in son, this repetition are for purposes of simplicity and clarity, itself not indicate to be begged for
By the relationship between various embodiments and/or setting.In addition, the various specific techniques that embodiments of the present invention provide
With the example of material, but those of ordinary skill in the art may be aware that the application of other techniques and/or other materials make
With.
In the description of this specification, reference term " embodiment ", " some embodiments ", " schematically implementation
The description of mode ", " example ", specific examples or " some examples " etc. means the tool described in conjunction with the embodiment or example
Body characteristics, structure, material or feature are contained at least one embodiment or example of the invention.In the present specification,
Schematic expression of the above terms are not necessarily referring to identical embodiment or example.Moreover, the specific features of description, knot
Structure, material or feature can be combined in any suitable manner in any one or more embodiments or example.
Any process described otherwise above or method description are construed as in flow chart or herein, and expression includes
It is one or more for realizing specific logical function or process the step of executable instruction code module, segment or portion
Point, and the range of the preferred embodiment of the present invention includes other realization, wherein can not press shown or discussed suitable
Sequence, including according to related function by it is basic simultaneously in the way of or in the opposite order, to execute function, this should be of the invention
Embodiment person of ordinary skill in the field understood.
Expression or logic and/or step described otherwise above herein in flow charts, for example, being considered use
In the order list for the executable instruction for realizing logic function, may be embodied in any computer-readable medium, for
Instruction execution system, device or equipment (such as computer based system, including the system of processing module or other can be from instruction
Execute system, device or equipment instruction fetch and the system that executes instruction) use, or combine these instruction execution systems, device or
Equipment and use.For the purpose of this specification, " computer-readable medium " can be it is any may include, store, communicating, propagating or
Transfer program uses for instruction execution system, device or equipment or in conjunction with these instruction execution systems, device or equipment
Device.The more specific example (non-exhaustive list) of computer-readable medium includes following：With one or more wiring
Electrical connection section (electronic device), portable computer diskette box (magnetic device), random access memory (RAM), read-only memory
(ROM), erasable edit read-only storage (EPROM or flash memory), fiber device and portable optic disk is read-only deposits
Reservoir (CDROM).In addition, computer-readable medium can even is that the paper that can print described program on it or other are suitable
Medium, because can then be edited, be interpreted or when necessary with it for example by carrying out optical scanner to paper or other media
His suitable method is handled electronically to obtain described program, is then stored in computer storage.
It should be appreciated that each section of embodiments of the present invention can be with hardware, software, firmware or their combination come real
It is existing.In the above-described embodiment, multiple steps or method can be with storages in memory and by suitable instruction execution system
The software or firmware of execution is realized.For example, if realized with hardware, in another embodiment, ability can be used
Any one of following technology or their combination well known to domain is realized：With for realizing logic function to data-signal
The discrete logic of logic gates, the specific integrated circuit with suitable combinational logic gate circuit, programmable gate array
(PGA), field programmable gate array (FPGA) etc..
Those skilled in the art are understood that realize all or part of step that above-described embodiment method carries
It suddenly is that relevant hardware can be instructed to complete by program, the program can store in a kind of computer-readable storage medium
In matter, which when being executed, includes the steps that one or a combination set of embodiment of the method.
In addition, each functional unit in various embodiments of the present invention can integrate in a processing module, it can also
To be that each unit physically exists alone, can also be integrated in two or more units in a module.It is above-mentioned integrated
Module both can take the form of hardware realization, can also be realized in the form of software function module.The integrated module
If in the form of software function module realize and when sold or used as an independent product, also can store one calculating
In machine read/write memory medium.
Storage medium mentioned above can be read-only memory, disk or CD etc..
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (7)
1. a kind of self-adapting correction method of earthing pole bus differential protecting, which is characterized in that include the following steps：
Judge earthing pole bus differential protecting with the presence or absence of difference current；
If being judged as YES, difference current I is obtaineddiffAnd compare difference current IdiffAbsolute value and preset electric current threshold value
Δ；
As difference current IdiffAbsolute value enter correcting logic when being greater than electric current threshold value Δ, and not by DC transmission system
Uneven branch is judged with the earthing pole bus differential protecting state recognition signal condition feature under operating condition, in turn
Processing is corrected to uneven branch；
Wherein, difference current IdiffIt is calculated by following equation：
Idiff=| | IdLN-S1×IdLN_op|-|S2×IdLH_op-S3×(Idee1+Idee2)-S4×IdSG||
S1、S2、S3And S4For state recognition signal, IdLN is this pole neutral bus electric current, and IdSG is that switching current is grounded in station,
Idee1, Idee2 are respectively two ground electrode circuit electric currents, and it is to extremely straight that IdLN_op, which is to pole neutral bus electric current, IdLH_op,
Flow Line electric current.
2. the self-adapting correction method of earthing pole bus differential protecting as described in claim 1, which is characterized in that imbalance
Branch is corrected processing, including：
Place is corrected to uneven branch according to state recognition signal characteristic of the system in BP, GR and MR steady preview roadway
Reason, the feature of systematic steady state run time behaviour identification signal are specially：When BP mode steady-state operation, S1=1, S2=0, S3=1,
S4=0；When GR mode steady-state operation, S1=0, S2=0, S3=1, S4=0；When MR mode steady-state operation, S1=0, S2=1, S3=
0、S4=1.
3. the self-adapting correction method of earthing pole bus differential protecting as claimed in claim 2, which is characterized in that when state is known
Level signal S1It is described to state recognition signal S when being zero1It is corrected processing for 0 uneven branch and includes：
Determine that there are S1Corresponding branch current IdLN_op；
Processing is corrected to the uneven branch where branch current IdLN_op；
With S1=1, which carries out difference stream operation, obtains new poor flow valuve Idiff'；
When | Idiff'|<When Δ is set up, then correction pass signal and/or alarm signal are issued.
4. the self-adapting correction method of earthing pole bus differential protecting as claimed in claim 2, which is characterized in that when state is known
Level signal S3It is described to state recognition signal S when being zero3It is corrected processing for 0 uneven branch and includes：
Determine that there are S3Corresponding branch current Idee1 and Idee2；
Processing is corrected to the uneven branch where branch current Idee1 and Idee2；
With S3=1, which carries out difference stream operation, obtains new poor flow valuve Idiff'；
When | Idiff'|<When Δ is set up, then correction pass signal and/or alarm signal are issued.
5. the self-adapting correction method of earthing pole bus differential protecting as claimed in claim 2, which is characterized in that when state is known
Level signal S2It is described to state recognition signal S when being zero2It is corrected processing for 0 uneven branch and includes：
Determine that there are S2Corresponding branch current IdLH_op；
Determine S1With S3When being 0, processing is corrected to the uneven branch where branch current IdLH_op；
With S2=1, which carries out difference stream operation, obtains new poor flow valuve Idiff'；
When | Idiff'|<When Δ is set up, then correction pass signal and/or alarm signal are issued.
6. the self-adapting correction method of earthing pole bus differential protecting as claimed in claim 2, which is characterized in that when state is known
Level signal S2It is described to state recognition signal S when being zero2It is corrected processing for 0 normal operation branch and includes：
Determine that there are S2Corresponding branch current IdLH_op；
Determine S1Or S3When being 1, processing is not corrected to the operating status of branch where branch current IdLH_op.
7. the self-adapting correction method of earthing pole bus differential protecting as claimed in claim 2, which is characterized in that when state is known
Level signal S4It is described to state recognition signal S when being zero4It is corrected processing for 0 normal operation branch and includes：
Processing is not corrected to the operating status of the correspondence branch where branch current IdSG under MR mode.
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