CN106998054B - A kind of intelligent substation data reliability recognition methods based on information fusion - Google Patents
A kind of intelligent substation data reliability recognition methods based on information fusion Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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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
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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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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Abstract
The present invention discloses a kind of intelligent substation data reliability recognition methods based on information fusion, merge other interval sampling information and feature on the connected bus of route both ends and each side of main transformer, corresponding dummy synthesis SV data are merged by bus protection and are sent to route protection and main transformer protection, and CT is broken, the information such as disconnecting link exception set corresponding data quality, (such as remaining spacing current is mutated the other information of data, harmonic component and zero negative sequence curent change etc.) it bus is sent to by GOOSE by bus protection connects the corresponding route protection in interval and main transformer protection, route/main transformer protection increases big differential comprising bus and route/main transformer range, thus information carries out data reliability identification, when there are abnormal conditions in received SV, it can be reliably latched using big poor information, and when troubles inside the sample space occurs, It can effectively open, the method for the present invention improves the reliability of protection.
Description
Technical field
The present invention relates to a kind of intelligent substation data reliability recognition methods based on information fusion, belong to electric system
Field of automation technology.
Background technique
At present in intelligent station substation, the extensive application of combining unit is convenient for the shared of information, at present due to combining unit
Locating electromagnetic environment is severe, leads to often to occur that combining unit is abnormal, double AD are inconsistent or flying spot etc. is abnormal occurs, and current two
Many research work have been done to data exception by secondary device producer, the malfunction protected when avoiding the occurrence of exception, but due to data
Source is limited, and some abnormal datas are close with fault signature, and the accident of protection misoperation is caused to happen occasionally.Due to combining unit
It is single to will lead to merging for multiple protective devices (such as route combining unit, give route protection, give bus protection) for the information of acquisition
The exception of member influences the interval protection at the interval and protects across interval, due to the malfunction of protection, makes system under serious conditions
Situations such as vibrating, or even causing system sectionalizing brings very big harm to Operation of Electric Systems.
Existing identification intelligent substation after in the method for analog quantity information data exception, there are mainly two types of side
Formula:
1, combining unit itself verifies acquisition information, when discovery data have abnormal (such as device acquisition system itself
Situations such as system goes wrong, data overrun) when, additional error mark, is identified for accordingly protecting in SV message；
2, protective device differentiates the sample information received from combining unit, such as the inconsistent differentiation of double AD, data
The modes such as flying spot differentiates, CT broken string differentiates, to identify the exception of acquisition information, so that the corresponding protection of locking, avoids malfunctioning.
But due to limitation of threshold value and data source itself etc., cause algorithm itself that asking for data exception cannot be solved perfectly
Topic.
Therefore, in existing recognition methods, only acquisition data involved by itself are carried out as combining unit and protective device
Differentiate, data source is limited, and when abnormal data and fault signature are close, easily causes protection misoperation.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of existing technologies, a kind of intelligence based on information fusion is provided
Can substation data reliability recognition methods, based on being merged by intelligent transformer substation information, by main transformer protection, route protection itself
Acquired information is merged with remaining branch information of adjacent bus, carries out comprehensive distinguishing, identifies exception information, and is latched corresponding
Protection, improves the reliability of protection.
In order to solve the above technical problems, the present invention provides a kind of intelligent substation data reliability knowledge based on information fusion
Other method, comprising the following steps:
1) the dummy synthesis electric current i of busbar protective device synthesis interval xex_x, and this SV information is sent in the specific format
To corresponding route protection or main transformer protection；
Wherein, x, j represent separation dot, and N is met interval sum, i by bus where the x of intervaljFor the SV information for being spaced j, kjFor
The method of operation of j, k are spaced where being spaced x on busj=1 indicates interval j and is spaced x on same bus, kjBetween=0 indicates
Every j and interval x not on same bus；
Dummy synthesis electric current iex_xData quality each interval SV data quality for participating in calculating is merged to obtain it is new
SV data quality；
2) busbar protective device will affect iex_xThe information for calculating validity is sent to x pairs of interval by GOOSE message
The route protection or main transformer protection answered；It is described to influence iex_xCalculate validity information include where the x of interval on bus other
The no current at interval is mutated resultant signal F_no_sudchg_x, and the electric current at other intervals is without harmonic wave resultant signal on the bus of the interval place x
F_no_harm_x, remove CT broken string branch on bus where the x of interval is more than threshold resultant signal F_no_ without zero sequence negative-sequence current
These three signals are referred to as auxiliary GOOSE information by I02_x；
3) differential logic of interval x is adjusted, the differential criterion after being adjusted；
4) after route/main transformer protection enters relay protective scheme discriminant function, first differentiate communicated with bus SV whether normally with
And whether new SV data quality is normal, if the two is normal, is transferred to step 5)；If communicated with bus SV it is abnormal or
The new SV data quality of person is abnormal, then is transferred to step 6)；
5) it when differential element movement, carries out the big difference of route/main transformer and differentiates, if big differential work, is judged to troubles inside the sample space,
Differential protection outlet；If big difference is failure to actuate when difference element acts, it is determined as that data are unreliable, and count off is according to abnormality alarming thing
Part and Blocking Differential Protection；This protection judgement terminates；
6) whether differentiation communicates normal with bus GOOSE, if communicated normally with bus GOOSE, is transferred to step 7)；Such as
Fruit communicates abnormal with bus GOOSE, then is transferred to step 8)；
7) it receives the normal interval no current that bus protection is sent and is mutated resultant signal, normal interval without harmonic wave resultant signal and nothing
Zero sequence negative-sequence current is more than threshold resultant signal, if these three conditions differential element movement when being all satisfied, is determined as data not
Reliably, count off is according to abnormality alarming event and Blocking Differential Protection；If these three conditions are not full up foot, difference element is dynamic at this time
Make, is then exported after being delayed；This protection judgement terminates；
8) subsidiary discriminant condition is unavailable, if difference element acts at this time, raises difference element threshold and through prolonging
When or without delay export.
In aforementioned step 1), data quality merging method are as follows: bus protection FPGA receives each interval combining unit hair
The SV message sent, in addition, CPU informs that FPGA calculates the method for operation matrix M of corresponding interval x in a manner of interruptingx, Mx=[k1,x,
k2,x…kN,x], interval n and interval x are when on same bus, kn,x=1, otherwise kn,x=0, FPGA merge company to data
Data tone information and delayed data after same merging are organized into new message correspondence and are sent to each interval；In changes of operating modes
When, CPU, which timely updates, corresponds to the method for operation matrix at interval, and informs FPGA.
Above-mentioned when data merge also to need that data quality is merged and confirmed, the method used is by source data
Quality by OR-gate logical assignment give new data.
It is above-mentioned when merging and confirming to data quality, in bus protection it has been determined that CT mutually occurs in certain interval
When broken string, then the phase data quality is set in vain；When being spaced changes of operating modes, then it is invalid instantaneously to set data quality, through 1s
Real-time update data quality after confirmation；When it has been determined that being spaced disconnecting link exception, merging data quality is set in vain；If entering mutual
Connection state, then update MxA plurality of bus is formed a big bus by matrix, and by this MxMatrix, which is assigned to, merges SV data.
In aforementioned step 3), the differential logic of interval x is adjusted and is adjusted including the big difference adjustment of route and the big difference of main transformer
It is whole；
The big poor adjustment process of the route are as follows:
The route SV information i that route protection acquires this sidemWith dummy synthesis electric current iex_mAnd auxiliary GOOSE information F_
No_sudchg_m, F_no_harm_m, F_no_I02_m are transmitted to opposite side by light longitudinal channel, while obtaining what opposite side was sent
Route SV information inWith dummy synthesis electric current iex_nInformation and auxiliary GOOSE information F_no_sudchg_n, F_no_harm_n,
F_no_I02_n still uses imAnd inAs the main criterion of vertical difference, i is usedex_mAnd iex_nComposition includes route and two side bus
The big difference of route inside and the auxiliary GOOSE information of route two sides are used as assistant criteria, and obtaining route, big poor Sudden Changing Rate is differential sentences
According to the big poor steady-state quantity differential criterion of route；
Wherein, the big poor Sudden Changing Rate differential criterion of route are as follows:
ID_ex=| Δ iex_m+Δiex_n| (2)
ΔIR_ex=| Δ iex_m-Δiex_n| (3)
ΔID_ex>Iset_l (4)
ΔID_ex>Kex1ΔIR_ex (5)
Wherein, Δ ID_exWith Δ IR_exIt is the difference current of the big difference of route and the Sudden Changing Rate of stalling current, Δ i respectivelyex_mFor
The Sudden Changing Rate of this side dummy synthesis electric current, Δ iex_nFor the Sudden Changing Rate of opposite side dummy synthesis electric current, Iset_lFor the big poor threshold of route,
Kex1For Sudden Changing Rate ratio brake coefficient；
The big poor steady-state quantity differential criterion of route are as follows:
ID_ex=| iex_m+iex_n| (6)
IR_ex=| iex_m-iex_n| (7)
ID_ex>Iset_l (8)
ID_ex>Kex2IR_ex (9)
Wherein, ID_exAnd IR_exIt is the difference current and stalling current steady-state quantity of the big difference of route, iex_mFor this side dummy synthesis
Electric current, iex_nFor opposite side dummy synthesis electric current, Iset_lFor the big poor threshold of route, Kex2For steady-state quantity ratio brake coefficient；
The big poor adjustment process of the main transformer are as follows: main transformer protection acquires main transformer high-pressure side SV information ih, main transformer medium voltage side SV letter
Cease iMAnd main transformer low-pressure side SV information il, after each information is carried out amplitude and phase compensation by variable star angle, no-load voltage ratio conversion,
Obtain the dummy synthesis electric current i of each sideh_ex, iM_ex, il_ex, still use ih, iM, ilThe main criterion of difference is indulged as main transformer, is used
ih_ex, iM_ex, il_exThe big difference of the main transformer of composition and the auxiliary GOOSE information of the high, medium and low each side of main transformer are obtained as assistant criteria
The big poor Sudden Changing Rate differential criterion of main transformer and the big poor steady-state quantity differential criterion of main transformer,
Wherein, the big poor Sudden Changing Rate differential criterion of main transformer are as follows:
Id_ex=| Δ ih_ex+ΔiM_ex+Δil_ex| (10)
ΔId_ex>Iset_t (12)
ΔId_ex>Kex1ΔIr_ex (13)
Wherein, Δ Id_exWith Δ Ir_exIt is the difference current of the big difference of main transformer and the Sudden Changing Rate of stalling current, Δ ih_exFor main transformer
The Sudden Changing Rate of high-pressure side dummy synthesis electric current, Δ iM_exFor the Sudden Changing Rate of main transformer medium voltage side dummy synthesis electric current, Δ il_exFor main transformer
The Sudden Changing Rate of low-pressure side dummy synthesis electric current, Iset_tBased on become larger poor threshold, Kex1For Sudden Changing Rate ratio brake coefficient；
The big poor steady-state quantity differential criterion of main transformer are as follows:
Id_ex=| ih_ex+iM_ex+il_ex| (14)
Id_ex>Iset_t, work as Ir_ex<IsWhen (16)
Id_ex>Iset_t+(Ir_ex-Is)Kex2, work as Ir_ex≥IsWhen (17)
Wherein, Id_exAnd Ir_exIt is the difference current and stalling current steady-state quantity of the big difference of main transformer, ih_exBased on to become high-pressure side empty
It is fitted to electric current, iM_exFor main transformer medium voltage side dummy synthesis electric current, il_exFor main transformer low-pressure side dummy synthesis electric current, IsFor braking
Measure keen current, Iset_tBased on become larger poor threshold, Kex2For steady-state quantity ratio brake coefficient.
It is when data quality above-mentioned in the big difference of route or the big difference of main transformer is normal, then vertical poor using the big difference of route and route
" with door " logic, if the data quality of the big difference of route is abnormal, using the auxiliary GOOSE information result conduct of route or main transformer
Barring condition, it is vertical poor to be latched if being 1, if being not all 1 increases different delayed time for the vertical difference outlet of route, wherein other
F_no_harm is 1, other when F_no_sudchg is 1 when no current mutation, other interval harmonic contents are below threshold
F_no_I02 is 1 when zero negative sequence electric current content is below threshold.
The big poor threshold of route above-mentioned is set as 0.8 times of the vertical poor differential action electric current threshold of route.
Sudden Changing Rate ratio brake coefficient above-mentioned takes 0.6.
Steady-state quantity ratio brake coefficient above-mentioned takes 0.4.
The big poor threshold of main transformer above-mentioned is set as 0.8 times of the vertical poor differential action electric current threshold of main transformer.
Advantageous effects of the invention:
Based on the present invention is merged by intelligent transformer substation information, by main transformer protection, the acquired information of route protection itself with
The fusion of remaining branch information of adjacent bus, carries out comprehensive distinguishing, when main transformer protection, there are different for the acquired information of route protection itself
Often, when not reflecting primary system analog quantity information really, by the comprehensive distinguishing of fuse information, exception information is identified, and close
The corresponding protection of lock；When system is there are when failure, by the comprehensive distinguishing of fuse information, opening is corresponding to be protected.It is not influencing
Under the premise of protecting four property of original protection, the reliability of protection is improved.
Detailed description of the invention
Fig. 1 is the data reliability identification process figure merged based on information；
Fig. 2 is that data quality synthesizes schematic diagram；
Fig. 3 is that bus protection data merge schematic diagram；
Fig. 4 is that the big difference data of intelligent substation merges schematic diagram；
Fig. 5 is that route/main transformer protection data reliability identifies journey figure.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
For data, we need to confirm that its degree of reliability, such as CT broken string, CT saturation etc. will lead to secondary electricity when in use
Stream is not corresponded with primary current, and error is very big, if can directly reduce the reliability of protection using insecure information.
In 220kV and following intelligent substation, sampled data is provided to protective device using MU device, scene occurs a lot of MU's itself
Problem causes to protect received sample information and primary current/voltage very inconsistent, such as: there is abnormal sudden change, data in data
Situations such as having sent history value can only go to identify abnormal feature as far as possible in the case where data source is single, but this there is always ashes
The case where color region, protective device can not identify.If carrying out the fusion of information using the information of station domain and multi-Substation, provide
Multi-source data, this just provides more information content to protective device, is more favorable for the degree of reliability of protective device identification data, pole
The reliability of protective device is improved greatly.
As shown in Figure 1, the present invention provides a kind of intelligent substation data reliability recognition methods based on information fusion, packet
Include following steps:
1) electric current and i of other branches of bus where the x of busbar protective device synthesis intervalex_x, and by this SV information with
Specific format (such as SV9-2) is sent to corresponding route protection or main transformer protection；
Wherein, iex_xFor the dummy synthesis electric current for being spaced x, remaining of bus in addition to being spaced x where being meant that interval x
Every the sum of instantaneous value (including ABC three-phase and double AD information), x, j represent separation dot, between N is connect by bus where the x of interval
Every sum, ijFor the SV information for being spaced j, kjFor the method for operation for being spaced j where the x of interval on bus, kj=1 indicate interval j and
Every x on same bus, kj=0 indicates interval j and interval x not on same bus.Dummy synthesis electric current iex_xData
Quality merges each interval SV data quality for participating in calculating to obtain new SV data quality, in order to guarantee the synchronization of data
Property, the delayed data of sample information is inserted in dummy synthesis electric current.
Fig. 2 data quality synthesizes schematic diagram, and ASDU is that combining unit is respectively spaced by the bus that SV message is sent to FPGA
Current data, in addition, CPU informs that FPGA calculates the method for operation matrix M of corresponding interval x in a manner of interruptingx, Mx=[k1,x,
k2,x…kN,x], D=[sv1,sv2…svN]T, svi(i=1,2 ... N) indicates the SV sampled data of interval i.Interval n and interval x exist
When on same bus, kn,x=1, otherwise kn,x=0.In changes of operating modes, CPU, which timely updates, corresponds to the operation side at interval
Formula matrix MxAnd inform FPGA.FPGA merges together with the data tone information and delayed data tissue after merging data
Each interval is sent at new message correspondence.For the application of subsequent differential protection, the specified delay of data is used and is participated in
Specified delay+merging time of the longest ASDU of calculating, calculated result are issued as new data delay.Subsequent algorithm uses
The mode of ratio brake allows the delay of merging data with the presence of certain error.
It when data merge, also needs that data quality Q is merged and confirmed, since selected data is using multiple ASDU
Data carry out instantaneous value summation of sampling at unified moment, therefore the quality of its source data then passes through OR-gate logical assignment to new
Data.This is simple data merging treatment, in order to obtain more reliable information, by protection to data source, the method for operation
Variation, then fusion in quality, improve the reliability of data, as shown in Figure 3.In bus protection it has been determined that certain interval phase
When there is CT broken string, then the phase data quality is set in vain.Changes of operating modes (such as disconnecting link displacement, interconnection operation) at interval
Deng to avoid the exception in data handoff procedure, then it is invalid instantaneously to set data quality, the then real-time update data product after 1s confirms
Matter.When it has been determined that being spaced disconnecting link exception, for the shortage of data for avoiding merging data source, merging data quality is set in vain.
If updating M into interconnection statexA plurality of bus is formed a big bus, and this information is assigned to and merges SV number by matrix
According to.
For data reliability, busbar protective device will affect the calculating authenticity of merging data, bus where the x of interval
The no current at other upper intervals is mutated resultant signal F_no_sudchg_x, and the electric current at other intervals is without harmonic wave on the bus of the interval place x
Resultant signal F_no_harm_x, remove CT broken string interval on bus where the x of interval is more than threshold resultant signal F_ without zero sequence negative-sequence current
No_I02_x, bus protection are sent out F_no_sudchg_x, F_no_harm_x, F_no_I02_x by GOOSE message by interval
Give corresponding route or main transformer protection.
Fig. 4 is that the big difference data of intelligent substation merges schematic diagram, busbar protective device, according to bus where the x of interval
Other interval three-phase sampled value instantaneous values on same bus are obtained dummy synthesis electric current using addition by other interval informations
iex_x, and this SV information is sent to the route protection or main transformer protection at corresponding interval in the specific format (such as SV9-2).Power transformation
It stands in M, the dummy synthesis electric current of each corresponding each side of side synthesis of signal main transformer, wherein low-pressure side bus protection is by low route 1MU, low
Route 2MU electric current synthesizes low merging data and is sent to main transformer protection for big poor logic；For transformer medium voltage side interval, examine
After considering the method for operation, mother MU, segmentation 1MU electric current are synthesized middle merging data and are sent to transformer by medium voltage side bus protection
Protection；Likewise, in view of after remaining interval method of operation for be spaced for route 1, medium voltage side bus protection by mother MU, divide
The merging data of section 2MU electric current synthesis is sent to the station the M route protection of route 1；Similarly, high-voltage side bus protection by mother MU,
The high merging data of 2 spacing current of route synthesis is sent to tranformer protection.In substation N, the synthesis of signal route two sides is corresponded to
The dummy synthesis electric current of two sides.Mother MU, line segregation, transformer spacing current are synthesized merging data and sent by bus protection
To the station the N route protection of route 1.M station owner become high, medium and low three side merging data for M station owner become larger difference differentiate, the M of route 1
Side, N station side two sides merging data stand for the big poor differentiation of route 1.
2) busbar protective device will affect iex_xThe information for calculating validity is sent to x pairs of interval by GOOSE message
The route or main transformer protection answered；These information include the no current mutation resultant signal F_no_ at other intervals on bus where being spaced x
Sudchg_x, the electric current at other intervals is without harmonic wave resultant signal F_no_harm_x on bus where the x of interval, where being spaced x on bus
What it is except CT broken string branch is more than threshold resultant signal F_no_I02_x without zero sequence negative-sequence current, is referred to as auxiliary GOOSE information.
3) the route CT information i that route protection acquires the side m (this side)m(m side line road protective current SV information) and iex_mLetter
Breath (side m route protection receives bus protection and current information) and F_no_sudchg_m, F_no_harm_m, F_no_I02_m
Etc. information (side m route protection receive bus protection assist GOOSE information) side n (opposite side) is transmitted to by light longitudinal channel, obtain simultaneously
Obtain the i that the side n is sentnAnd iex_nThe information such as information and F_no_sudchg_n, F_no_harm_n, F_no_I02_n, still make
Use imAnd inAs the main criterion of vertical difference, increases and use iex_mAnd iex_nThe route of composition is big, and poor (including route and two side bus exist
Interior is big differential) and cooperation route two sides auxiliary GOOSE information assistant criteria, wherein Sudden Changing Rate is differential sentences for route big difference
According to are as follows:
ID_ex=| Δ iex_m+Δiex_n| (2)
ΔIR_ex=| Δ iex_m-Δiex_n| (3)
ΔID_ex>Iset_l (4)
ΔID_ex>Kex1ΔIR_ex (5)
Wherein, Δ ID_exWith Δ IR_exIt is the difference current and system of route big poor (containing two side bus and route) respectively
The Sudden Changing Rate of streaming current, Δ iex_mFor the Sudden Changing Rate of M station track road (being spaced m on corresponding bus) protection dummy synthesis electric current, Δ iex_n
For the Sudden Changing Rate of N station track road (being spaced n on corresponding bus) protection dummy synthesis electric current, Iset_lFor the big poor threshold of route, generally may be used
It is set as 0.8 times with the vertical poor differential action electric current threshold of route, Kex1For Sudden Changing Rate ratio brake coefficient, general Kex1Take 0.6.
The big poor steady-state quantity differential criterion of route are as follows:
ID_ex=| iex_m+iex_n| (6)
IR_ex=| iex_m-iex_n| (7)
ID_ex>Iset_l (8)
ID_ex>Kex2IR_ex (9)
Wherein, ID_exAnd IR_exBe route big poor (containing two side bus and route) difference current and stalling current it is steady
State amount, iex_mFor M station track road (being spaced m on corresponding bus) protection dummy synthesis electric current, iex_nIt is N station track road (between on corresponding bus
Every n) protection dummy synthesis electric current, Iset_lFor the big poor threshold of route, 0.8 times that the threshold of difference is indulged with route generally may be configured as,
Kex2For steady-state quantity ratio brake coefficient, general Kex2Take 0.4.
4) main transformer protection acquires main transformer high-pressure side SV information ih, main transformer medium voltage side SV information iMAnd main transformer low-pressure side SV information
il, after each information is carried out amplitude and phase compensation by variable star angle, no-load voltage ratio conversion, obtain ih_ex, iM_ex, il_ex, still make
Use ih, iM, ilThe main criterion of difference is indulged as main transformer, is increased and is used ih_ex, iM_ex, il_exBig poor (including the main transformer sheet of the main transformer of composition
It is big differential including body and each side bus) and cooperation the high, medium and low each side of main transformer auxiliary GOOSE information assistant criteria,
In,
The big poor Sudden Changing Rate differential criterion of main transformer are as follows:
Id_ex=| Δ ih_ex+ΔiM_ex+Δil_ex| (10)
ΔId_ex>Iset_t (12)
ΔId_ex>Kex1ΔIr_ex (13)
Wherein, Δ Id_exWith Δ Ir_exIt is the difference current and system of main transformer big poor (containing two side bus and main transformer body)
The Sudden Changing Rate of streaming current, wherein the electric current of each side has already passed through the amplitude compensations such as the conversion of star angle and phase voltage, Δ ih_exFor
Main transformer high-pressure side (corresponds to the Sudden Changing Rate of the corresponding dummy synthesis electric current of bus interval h), Δ iM_exIt is (corresponding female for main transformer medium voltage side
The Sudden Changing Rate of the corresponding dummy synthesis electric current of line interval m), Δ il_ex(the corresponding void of bus interval l) is corresponded to for main transformer low-pressure side
It is fitted to the Sudden Changing Rate of electric current, Iset_tBased on become larger poor threshold, generally may be configured as the vertical poor differential action electric current threshold of main transformer
0.8 times, Kex1For Sudden Changing Rate ratio brake coefficient, general Kex1Take 0.6.
The big poor steady-state quantity differential criterion of main transformer are as follows:
Id_ex=| ih_ex+iM_ex+il_ex| (14)
Id_ex>Iset_t, work as Ir_ex<IsWhen (16)
Id_ex>Iset_t+(Ir_ex-Is)Kex2, work as Ir_ex≥IsWhen (17)
Wherein, Id_exAnd Ir_exIt is the difference current of main transformer big poor (containing main transformer two sides/tri- side bus and main transformer body)
With stalling current steady-state quantity, converted and the amplitude compensations such as phase voltage, i wherein the electric current of each side has already passed through star angleh_exFor
Main transformer high-pressure side (corresponds to the corresponding dummy synthesis electric current of bus interval h), iM_exFor main transformer medium voltage side, (corresponding bus interval m) is right
The dummy synthesis electric current answered, il_ex(the corresponding dummy synthesis electric current of bus interval l), I are corresponded to for main transformer low-pressure sidesFor braking amount
Keen current, can 0.8 high-pressure side rated current of value, Iset_tBased on become larger poor threshold, generally may be configured as the vertical poor threshold of main transformer
0.8 times, Kex2For steady-state quantity ratio brake coefficient, general Kex2Take 0.3.
When the data quality of the big difference of route is normal, then poor " with door " logic is indulged using the big difference of route and route, if route
Big poor data quality is abnormal, then uses F_no_sudchg (for 1 when other interval no currents are mutated), F_no_harm (its
When its interval harmonic content is below threshold for 1), (other interval zero negative sequence electric current contents are F_no_I02 when being below threshold
1) for result as barring condition, it is vertical poor to be latched if being 1, if being not all 1 increases different delayed time for the vertical difference outlet of route.Its
In, when F_no_sudchg becomes FALSE from TRUE, broaden 150ms.The design of main transformer protection is identical as route protection.
Route protection and main transformer protection utilize virtual simultaneously still using respective longitudinal differential protection as main criterion
The big difference of the route of generated data composition and the big difference of main transformer are used as assistant criteria, and to improve the reliability of data, the logic of protection is such as
Shown in Fig. 5.This logical schematic is suitable for route protection and main transformer protection.Route/main transformer protection enters relay protective scheme and differentiates letter
After number, differentiates communicate whether normal and generated data quality is normal with bus SV first, if the two is normal, be on duty
When moving element movement, carrying out the big difference of route/main transformer differentiates, if big differential work, be judged to troubles inside the sample space, differential protection exports,
If big difference is failure to actuate when difference element acts, it is determined as that data are unreliable, and count off is according to abnormality alarming event and is latched difference
Dynamic protection；Into after discriminant function, if it is abnormal to communicate abnormal or generated data quality with bus SV, bus is differentiated
Whether GOOSE communication is normal.It dashes forward if being communicated with bus GOOSE and normally receiving the normal interval no current that bus protection is sent
Become mark (F_no_sudchg), normal interval without harmonic wave and without zero negative sequence current signature (F_no_harm and F_no_I02), such as
These three conditions of fruit differential element movement when being all satisfied, then be determined as that data are unreliable, and count off is according to abnormality alarming event and closes
Lock differential protection；If these three conditions are not full up foot, difference element is acted at this time, then is exported after being delayed；If with bus
GOOSE communication is abnormal, then it represents that subsidiary discriminant condition is unavailable, if difference element acts at this time, raises difference element
It threshold and is delayed (t1 ≠ 0) or is exported without delay (t1=0) to improve the reliability of protection act.
In order to enhance reliability, quick-action, sensitivity and the selectivity of criterion, the big difference of route/main transformer is divided into Sudden Changing Rate
Differential and steady-state quantity is differential, and wherein Sudden Changing Rate is differential and the differential slope of curve of steady-state quantity and threshold are that (vertical connection is poor for main protection
Dynamic protection) subset, when vertical difference meets, the big poor differential criterion of route (main transformer) is also satisfaction certainly.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of intelligent substation data reliability recognition methods based on information fusion, which comprises the following steps:
1) the dummy synthesis electric current i of busbar protective device synthesis interval xex_x, and this SV information is sent to correspondence in the specific format
Route protection or main transformer protection；
Wherein, x, j represent separation dot, and N is met interval sum, i by bus where the x of intervaljFor the SV information for being spaced j, kjFor interval
The method of operation of j, k are spaced where x on busj=1 indicates interval j and is spaced x on same bus, kj=0 indicates interval j
With interval x not on same bus；Dummy synthesis electric current iex_xData quality will participate in calculate each interval SV data product
Matter merges to obtain new SV data quality；
2) busbar protective device will affect iex_xThe information for calculating validity is sent to the corresponding line of interval x by GOOSE message
Road protection or main transformer protection；It is described to influence iex_xThe information for calculating validity includes other intervals on the bus of the interval place x
No current is mutated resultant signal F_no_sudchg_x, and the electric current at other intervals is without harmonic wave resultant signal F_no_ on the bus of the interval place x
Harm_x, remove CT broken string branch on bus where the x of interval is more than threshold resultant signal F_no_I02_x without zero sequence negative-sequence current, will
These three signals are referred to as auxiliary GOOSE information；
3) differential logic of interval x is adjusted, the differential criterion after being adjusted；
4) after route/main transformer protection enters relay protective scheme discriminant function, whether differentiation communicates normal and new with bus SV first
SV data quality it is whether normal, if the two is normal, be transferred to step 5)；If communicated with bus SV abnormal or new
SV data quality it is abnormal, then be transferred to step 6)；
5) it when differential element movement, carries out the big difference of route/main transformer and differentiates, it is differential if big differential work, is judged to troubles inside the sample space
Protection exit；If big difference is failure to actuate when difference element acts, it is unreliable to be determined as data, count off according to abnormality alarming event simultaneously
And Blocking Differential Protection；This protection judgement terminates；
6) whether differentiation communicates normal with bus GOOSE, if communicated normally with bus GOOSE, is transferred to step 7)；If with
Bus GOOSE communication is abnormal, then is transferred to step 8)；
7) it receives the normal interval no current that bus protection is sent and is mutated resultant signal, normal interval electric current without harmonic wave resultant signal and nothing
Zero sequence negative-sequence current is more than threshold resultant signal, if these three conditions differential element movement when being all satisfied, is determined as data not
Reliably, count off is according to abnormality alarming event and Blocking Differential Protection；If these three conditions are not full up foot, difference element is dynamic at this time
Make, is then exported after being delayed；This protection judgement terminates；
8) subsidiary discriminant condition is unavailable, if at this time difference element act, raise difference element threshold and through delay or
It is exported without delay.
2. a kind of intelligent substation data reliability recognition methods based on information fusion according to claim 1, special
Sign is, in the step 1), data quality merging method are as follows: bus protection FPGA receives what each interval combining unit was sent
SV message, in addition, CPU informs that FPGA calculates the method for operation matrix M of corresponding interval x in a manner of interruptingx, Mx=[k1,x,
k2,x…kN,x], interval n and interval x are when on same bus, kn,x=1, otherwise kn,x=0, FPGA merge company to data
Data tone information and delayed data after same merging are organized into new message correspondence and are sent to each interval；In changes of operating modes
When, CPU, which timely updates, corresponds to the method for operation matrix at interval, and informs FPGA.
3. a kind of intelligent substation data reliability recognition methods based on information fusion according to claim 2, special
Sign is, when data merge, also needs that data quality is merged and confirmed, the method used is by the quality of source data warp
OR-gate logical assignment is crossed to new data.
4. a kind of intelligent substation data reliability recognition methods based on information fusion according to claim 3, special
Sign is, when merging and confirming to data quality, in bus protection it has been determined that when mutually there is CT broken string in certain interval,
Then the phase data quality is set in vain；When being spaced changes of operating modes, then it is invalid instantaneously to set data quality, real after 1s confirms
Shi Gengxin data quality；When it has been determined that being spaced disconnecting link exception, merging data quality is set in vain；If into interconnection state,
Then update MxA plurality of bus is formed a big bus by matrix, and by this MxMatrix, which is assigned to, merges SV data.
5. a kind of intelligent substation data reliability recognition methods based on information fusion according to claim 1, special
Sign is, in the step 3), is adjusted to the differential logic of interval x and adjusts including the big difference adjustment of route and the big difference of main transformer；
The big poor adjustment process of the route are as follows:
The route SV information i that route protection acquires this sidemWith dummy synthesis electric current iex_mAnd auxiliary GOOSE information F_no_
Sudchg_m, F_no_harm_m, F_no_I02_m are transmitted to opposite side by light longitudinal channel, while obtaining the line that opposite side is sent
Road SV information inWith dummy synthesis electric current iex_nInformation and auxiliary GOOSE information F_no_sudchg_n, F_no_harm_n, F_
No_I02_n still uses imAnd inAs the main criterion of vertical difference, i is usedex_mAnd iex_nComposition includes that route and two side bus exist
The big difference of interior route and the auxiliary GOOSE information of route two sides obtain the big poor Sudden Changing Rate differential criterion of route as assistant criteria
With the big poor steady-state quantity differential criterion of route；
Wherein, the big poor Sudden Changing Rate differential criterion of route are as follows:
ΔID_ex=| Δ iex_m+Δiex_n| (2)
ΔIR_ex=| Δ iex_m-Δiex_n| (3)
ΔID_ex>Iset_l (4)
ΔID_ex>Kex1ΔIR_ex (5)
Wherein, Δ ID_exWith Δ IR_exIt is the difference current of the big difference of route and the Sudden Changing Rate of stalling current, Δ i respectivelyex_mFor this side
The Sudden Changing Rate of dummy synthesis electric current, Δ iex_nFor the Sudden Changing Rate of opposite side dummy synthesis electric current, Iset_lFor the big poor threshold of route, Kex1
For Sudden Changing Rate ratio brake coefficient；
The big poor steady-state quantity differential criterion of route are as follows:
ID_ex=| iex_m+iex_n| (6)
IR_ex=| iex_m-iex_n| (7)
ID_ex>Iset_l (8)
ID_ex>Kex2IR_ex (9)
Wherein, ID_exAnd IR_exIt is the difference current and stalling current steady-state quantity of the big difference of route, iex_mFor this side dummy synthesis electricity
Stream, iex_nFor opposite side dummy synthesis electric current, Iset_lFor the big poor threshold of route, Kex2For steady-state quantity ratio brake coefficient；
The big poor adjustment process of the main transformer are as follows: main transformer protection acquires main transformer high-pressure side SV information ih, main transformer medium voltage side SV information iMAnd
Main transformer low-pressure side SV information il, after each information is carried out amplitude and phase compensation by variable star angle, no-load voltage ratio conversion, obtain each
The dummy synthesis electric current i of sideh_ex, iM_ex, il_ex, still use ih, iM, ilThe main criterion that difference is indulged as main transformer, uses ih_ex, iM_ex,
il_exThe big difference of the main transformer of composition and the auxiliary GOOSE information of the high, medium and low each side of main transformer obtain the big difference of main transformer as assistant criteria
Sudden Changing Rate differential criterion and the big poor steady-state quantity differential criterion of main transformer,
Wherein, the big poor Sudden Changing Rate differential criterion of main transformer are as follows:
ΔId_ex=| Δ ih_ex+ΔiM_ex+Δil_ex| (10)
ΔId_ex>Iset_t (12)
ΔId_ex>Kex1ΔIr_ex (13)
Wherein, Δ Id_exWith Δ Ir_exIt is the difference current of the big difference of main transformer and the Sudden Changing Rate of stalling current, Δ ih_exBased on get higher pressure
The Sudden Changing Rate of side dummy synthesis electric current, Δ iM_exFor the Sudden Changing Rate of main transformer medium voltage side dummy synthesis electric current, Δ il_exBased on be lower pressure
The Sudden Changing Rate of side dummy synthesis electric current, Iset_tBased on become larger poor threshold, Kex1For Sudden Changing Rate ratio brake coefficient；
The big poor steady-state quantity differential criterion of main transformer are as follows:
Id_ex=| ih_ex+iM_ex+il_ex| (14)
Id_ex>Iset_t, work as Ir_ex< IsWhen (16)
Id_ex>Iset_t+(Ir_ex-Is)Kex2, work as Ir_ex≥IsWhen (17)
Wherein, Id_exAnd Ir_exIt is the difference current and stalling current steady-state quantity of the big difference of main transformer, ih_exBased on become high-pressure side virtually close
At electric current, iM_exFor main transformer medium voltage side dummy synthesis electric current, il_exFor main transformer low-pressure side dummy synthesis electric current, IsIt is turned for braking amount
Point electric current, Iset_tBased on become larger poor threshold, Kex2For steady-state quantity ratio brake coefficient.
6. a kind of intelligent substation data reliability recognition methods based on information fusion according to claim 5, special
Sign is, when the data quality of the big difference of route or the big difference of main transformer is normal, is then indulged and poor is patrolled " with door " using the big difference of route and route
Volume, if the data quality of the big difference of route is abnormal, using the auxiliary GOOSE information result of route or main transformer as locking item
Part, it is vertical poor to be latched if being 1, if being not all 1 increases different delayed time for the vertical difference outlet of route, wherein other intervals are without electricity
F_no_sudchg is 1 when stream mutation, F_no_harm is 1 when other interval harmonic contents are below threshold, other to be spaced zero negative
F_no_I02 is 1 when sequence electric current content is below threshold.
7. a kind of intelligent substation data reliability recognition methods based on information fusion according to claim 5, special
Sign is that the big poor threshold of the route is set as 0.8 times of the vertical poor differential action electric current threshold of route.
8. a kind of intelligent substation data reliability recognition methods based on information fusion according to claim 5, special
Sign is that the Sudden Changing Rate ratio brake coefficient takes 0.6.
9. a kind of intelligent substation data reliability recognition methods based on information fusion according to claim 5, special
Sign is that the steady-state quantity ratio brake coefficient takes 0.4.
10. a kind of intelligent substation data reliability recognition methods based on information fusion according to claim 5, special
Sign is that the big poor threshold of the main transformer is set as 0.8 times of the vertical poor differential action electric current threshold of main transformer.
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