CN105048418B - A kind of digital incomplete differential protection method for bus based on current status amount - Google Patents
A kind of digital incomplete differential protection method for bus based on current status amount Download PDFInfo
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- CN105048418B CN105048418B CN201510389701.3A CN201510389701A CN105048418B CN 105048418 B CN105048418 B CN 105048418B CN 201510389701 A CN201510389701 A CN 201510389701A CN 105048418 B CN105048418 B CN 105048418B
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Abstract
The present invention relates to a kind of digital incomplete differential protection method for bus based on current status amount, includes the following steps：Step 1, it determines that system is bilateral source power supply system or single-side power power supply system, determines the state and current direction of each power branch electric current；Step 2, the state of each non-power branch current is determined, each device is used and serviced the current status amount that sends based on GOOSE, each power branch device uses the GOOSE current status amounts sent out based on other devices where GOOSE service subscriptions on busbar；Step 3, each power branch device is bilateral source power supply system or single-side power power supply system according to system, is carried out at the same time split-phase breakdown judge respectively.The beneficial effects of the present invention are：Operating criterion can correctly distinguish normal operation and area's internal and external fault.2. operating criterion uses the quantity of state of each branch current, it is respectively completed by the protection of each power branch, does not require mutual inductor characteristic consistent.
Description
Technical field
The present invention relates to a kind of methods in Relay Protection Technology in Power System field, and in particular to one kind being based on current status
The digital incomplete differential protection method for bus of amount.
Background technology
In the power system, the element connected on 35kV and the busbar of following voltage class is generally relatively more, in this feelings
Under condition, more complex using fully current differential protection spill current circuit, cost is higher, and reliability is not high, is protected to simplify busbar
Shield, reduces equipment investment, and incomplete busbar differential protection device has been widely used.
Busbar incomplete differential protection accesses the electric current (power supply into and out of interconnection, mother) on each power branch of busbar
The sum of be used as action current, do not access the electric current of non-power branch（Outgoing）It is not involved in actuating quantity calculating.
It is in the prior art to have the following problems：
1, when normal, action current is equal to the electric current summation for not accessing each branch.To ensure protective device in normal condition
Under not malfunction, the maximum load current that the action current of protection need to be more than on this section of busbar adjusts.When the method for operation changes, shadow
Ring selectivity or the sensitivity of protection act.
2, power branch need to install the identical D grades of current transformer of characteristic.It is high to mutual inductor characteristic requirements.
Invention content
To overcome above-mentioned the deficiencies in the prior art, the present invention to provide a kind of digital incomplete mother based on current status amount
Line differential protecting method, adopts the technical scheme that：
Step 1, it determines that system is bilateral source power supply system or single-side power power supply system, determines each power branch electric current
State and current direction：
If system is bilateral source power supply system, 1）Electric current is flowed to the positive direction that circuit is electric current by busbar.2）Mother
Electric current is set as mother I and flows into the positive direction that mother II is electric current；
When system is single-side power power supply system, the state of each power branch electric current is only determined；
Bilateral source is powered：Gx=1 (Ix >=Iset, Dx=1)（1）
Gx=- 1 (Ix >=Iset, Dx=- 1)（2）
Gx=0 (Ix ＜ Iset)（3）
Single-side power is powered：Gx = 1 ( Ix ≥ Iset) （4）
Gx=0 (Ix ＜ Iset)（5）
In above-mentioned formula： GX For the state of certain phase current Ix, Dx is corresponding phase current direction, and Dx=1 represents positive direction.
Iset is current status definite value.
Step 2, the state of each non-power branch current is determined, each device is used sends current status based on GOOSE services
Amount, each power branch device use the GOOSE electric currents sent out based on other devices where GOOSE service subscriptions on busbar
Quantity of state；
Step 3, each power branch device is bilateral source power supply system or single-side power power supply system according to system, is divided
It is not carried out at the same time split-phase breakdown judge.
A) bilateral source criterion：Σ Gi ＜ 0；（6）
Gi ≤ 0；（7）
Σ Gkj= 0 （8）
Gm ≤ 0 （9）
Gm ≥ 0 （10）
When formula (6)~(9) are full up foot, the female not exclusively female differences of I meet operating criterion.
When formula (6)~(8), (10) are full up foot, the female not exclusively female differences of II meet operating criterion.
In formula：Gi be on same busbar power supply into and out of line, i=1~n；Gm mother states.
Gkj is feeder line state on same busbar, for locking amount, j=1~q.
Gm ≤ 0；Indicate that electric current flows to I mothers or mother by mother II and do not have electric current to flow through；
Gm ≥ 0；Indicate that electric current flows to II mothers or mother by mother I and do not have electric current to flow through；
B) single-side power criterion：
Σ Gi + Gm = 1 （11）
Σ Gkj = 0 （12）
Formula (11), (12) are full up foot when, not exclusively mother difference meet operating criterion.
In formula：Gi be on same busbar power supply into and out of line, i=1~n；Gm mother states.
Gkj is feeder fault state on same busbar, for locking amount, j=1~q.
Further, after device meets operating criterion, be delayed 10ms inlet-outlet line supply cell protection acts.
Step 4, mother interval Protection criteria
The current status amount that mother interval receives I mothers respectively, mother II is respectively spaced, each section differentiates respectively.Between inlet-outlet line power supply
It is acted every participation, locking amount is divided between outgoing.
When either segment criterion meets, the action of mother interval busbar incomplete differential protection.
When mother interval, which is in, closes position, following criterions are executed.
A) bilateral source criterion：
G1i ≤ 0； (13)
Σ G1kj = 0； (14)
Gm ＜ 0 (15)
Gm ＞ 0 (16)
Formula (13)~(15) are that the female not exclusively female differences of I meet operating criterion.
Formula (13), (14), (16) are that the female not exclusively female differences of II meet operating criterion.
In formula：Gli be on same section of busbar power supply into and out of line, i=1~n；Gm mother states.
Glkj is feeder line state on same section of busbar, for locking amount, j=1~q.
Gm ＜ 0；Indicate that electric current flows to I mothers by mother II；
Gm ＞ 0；Indicate that electric current flows to II mothers by mother I；
B) single-side power criterion：
Gm = 1 (17)
Gli = 0； (18)
Σ Glkj = 0； (19)
When I is female or the inlet-outlet line of II mothers, mother interval meet formula (17), (18), (19), inlet-outlet line, mother interval
Not exclusively female differential work.
The present invention operation principle be：Using the quantity of state of each power branch electric current on the busbar of place as actuating quantity, non-electrical
The electric current of source branch realizes protection act behavior as braking amount, using split-phase differential criterion.
The beneficial effects of the present invention are：1. operating criterion can correctly distinguish normal operation and area's internal and external fault.2. dynamic
Make the quantity of state that criterion uses each branch current, is respectively completed by the protection of each power branch, does not require mutual inductor characteristic consistent.
3. the action current of incomplete bus differential protection only needs to consider the peak load of this power branch, it is not required to consider non-electrical on this section of busbar
Source branch total load electric current, when the method for operation changes, selectivity or sensitivity are unaffected.4. method provided by the invention
In, using the protective device configured into and out of line on the same busbar of substation, it is not exclusively female poor to be realized by the way of communication
Protection, is not required to additionally increase protective device.5. method provided by the invention is suitable for conventional current mutual inductor, electronic mutual inductor
Or two kinds of mutual inductor mixing applications.6. in method provided by the invention, the operating criterion formula at inlet-outlet line interval（1）~（12）, it is female
Join spacing movement criterion formula（13）~（19）It is simple and reliable.
Description of the drawings
Fig. 1 is single (double) side electric supply system and the inside and outside schematic diagram that breaks down in protection zone in the method for the present invention.
Fig. 2 is the present embodiment incoming power interval logic chart.
Specific implementation mode
The specific implementation mode of the present invention is described in further detail below in conjunction with the accompanying drawings.
As shown in FIG. 1, FIG. 1 is the typical case of the method for the present invention (pressing ring network power supply in urban track traffic) system and
Protect schematic diagram.Fig. 2 is the typical calculation flow chart of the method for the present invention.
Specific embodiment 1
A kind of digital incomplete differential protection method for bus based on quantity of state, this method be according to power supply on busbar into
Outlet, the current status amount for feeding out circuit, judge protection act behavior using the incomplete differential criterion of split-phase.With I sections in Fig. 1
Illustrate for busbar（If mother Gm is off-state）, specifically include following steps：
Step 1, determine that system is bilateral source power supply system or single-side power power supply system, when system is bilateral source
When power supply system（G11, G12 inlet-outlet line are power supply point）, when system is single-side power power supply system（G11, G12 inlet-outlet line
Only one is power supply point）.
Step 2, it is bilateral source power supply system or single-side power power supply system according to system, between inlet-outlet line interval, mother
Current status amount is calculated separately every device.
Step 3, single-side power system model calculating current quantity of state is pressed at outgoing interval.
Step 4, each interval sends current status amount.
Step 5, inlet-outlet line, mother interval receive other current status amounts being respectively spaced on same busbar respectively.
Step 6, inlet-outlet line, mother interval are according to double（It is single）Side electric supply system criterion judges respectively, when criterion meets
When, the busbar incomplete differential protection action in inlet-outlet line, mother interval.
In the present embodiment, each interval, which is all made of, supports DL/T860《Substation communication network and system》DL/T 860.81
The protective device of the GOOSE services of the parts 8-1.
GOOSE services are for the communication between device, the rapid messages such as processing tripping.
Current direction：Electric current is flowed to the positive direction that circuit is electric current by busbar.Mother electric current is set as mother I and flows into mother II to be electricity
The positive direction of stream.
In step 1, according to substation（Institute）The determination of system wiring figure is unilateral or bilateral power supply system.
This example default is bilateral source power supply system.
In step 2, inlet-outlet line, mother interval determine that current status amount, the secondary virtual value and current direction of electric current can adopt
With full-cycle Fourier algorithm or half cycles fourier algorithm.Calculate separately real part, imaginary part, the virtual value of each phase current, the reality of voltage
Portion, imaginary part, virtual value, voltage are with reference to determining current direction.If system is single-side power power supply system, voltage is not calculated
Real part, imaginary part, virtual value and current direction.
The quantity of state of each phase current is calculated by formula (1)~(5).
In step 3, outgoing interval determines current status amount, the secondary virtual value of electric current using full-cycle Fourier algorithm or
Half cycles fourier algorithm.Calculate separately the virtual value of each phase current.
The quantity of state of each phase current is calculated by formula (4)~(5).
In step 4, each protective device that is spaced sends current status amount using based on GOOSE services.
In step 5, inlet-outlet line, mother interval protective device are used based on other on busbar where GOOSE service subscriptions
The GOOSE current status amounts that device is sent out.
In step 6, when system normal operation, there is no failure, the current status amount of each escapement is zero.Disengaging
Busbar incomplete differential protection set by line interval, mother escapement is unsatisfactory for the criterion by formula (6)-(19), and protection is equal
It is failure to actuate.In this example, if mother Gm is off-state.
1）Short trouble occurs for outgoing d2 points
Protection G11, G12, the current direction of incoming power point are negative direction, and the protection Gk14 current status of outgoing is equal
Start, the protection of other outgoings, mother does not start.
G11=- 1, G12=- 1, Gm=0, GK11~GK13=0, GK14=1.
Criterion formula（6）,（7）,（9）Meet, but criterion（8）It is unsatisfactory for.Incomplete mother of the scattering device in G11, G12 is poor
It is failure to actuate.Protection act in GK14 cuts off failure.
2）Short trouble occurs for I sections of busbar d1 points
Each outgoing, mother do not start GK11~GK14=0, Gm=0, and inlet wire starts G11=- 1, G12=- 1.
Criterion formula（6）~（9）Meet condition, incomplete mother differential work of the scattering device in G11, G12.
Specific embodiment 2
This example default is bilateral source power supply system.In the present embodiment, Gm is to close position state.
1）Short trouble occurs for I sections of busbar outgoing d2 points
Mother's I inlet wire G11, G12, mother, outgoing protection Gk14 current status start, the protection of other outgoings is equal
Do not start.
G11=- 1, G12=- 1, Gm<0, GK11 ~ GK13=0, GK14=1
Criterion formula（13）,（15）Meet, but criterion（14）It is unsatisfactory for, the female not exclusively female differences of I are failure to actuate, and II is female not exclusively female
Difference is failure to actuate (Gm<0, electric current flows to I mothers, formula by mother II（16）It is unsatisfactory for).
Protection act in GK14 cuts off failure.
2）Short trouble occurs for I sections of busbar d1 points
Mother's I inlet wire G11, G12, mother protective current state start（G11 = -1、G12 = -1、Gm<0）
The protection of each outgoing does not start GK11 ~ GK14=0, criterion formula（13）,（14）,（15）Meet condition.
The female not exclusively female differential works of I.
The female not exclusively female differences of II are failure to actuate (Gm<0, electric current flows to I mothers, formula by mother II（16）It is unsatisfactory for).
Finally it should be noted that:Above example is merely to illustrate the technical solution of the application rather than to its protection domain
Limitation, although the application is described in detail with reference to above-described embodiment, those of ordinary skill in the art should
Understand:Those skilled in the art read the specific implementation mode of application can still be carried out after the application various changes, modification or
Person's equivalent replacement, but these changes, modification or equivalent replacement, are applying within pending claims.
Claims (1)
1. a kind of digital incomplete differential protection method for bus based on current status amount, is specifically implemented according to the following steps：
Step 1, determine that system is bilateral source power supply system or single-side power power supply system, if system is bilateral source power supply system
When system, each power branch current status and current direction are determined；When system is single-side power power supply system, each power supply is only determined
The state of branch current；
Bilateral source is powered：Gx=1 (Ix >=Iset, Dx=1)（1）
Gx=- 1 (Ix >=Iset, Dx=- 1)（2）
Gx=0 (Ix ＜ Iset)（3）
Single-side power is powered：Gx = 1( Ix ≥ Iset) （4）
Gx=0 (Ix ＜ Iset)（5）
GX For the state of certain phase current Ix, Dx is corresponding phase current direction, and Dx=1 represents positive direction, and Iset is fixed for current status
Value；
Step 2, the electric current shape of other devices where each device sends current status amount, each power branch device receives on busbar
State amount；
Step 3, each power branch device is according to bilateral source power supply system criterion and single-side power power supply system criterion, respectively together
Shi Jinhang inlet-outlet lines and the protection of mother interval judge：
（1）Inlet-outlet line Protection criteria：
A) bilateral source criterion：Σ Gli ＜ 0；（6）
Gli ≤ 0；（7）
Σ Glkj= 0 （8）
Gm ≤ 0 （9）
Gm ≥ 0 （10）
When formula (6)~(9) are full up foot, the female not exclusively female differences of I meet operating criterion；
When formula (6)~(8), (10) are full up foot, the female not exclusively female differences of II meet operating criterion；
In formula：Gli is that for power supply into and out of linear state, l indicates that busbar number, l=1~2, i indicate that same busbar is enterprising on same busbar
Number of outgoing, i=1~n, n are not more than 4；
Glkj is feeder line state on same busbar, and for locking amount, l indicates busbar number, and l=1~2, j indicates to present on same section of busbar
Number of outgoing, j=1~q, q are not more than 10；K represents outgoing；
B) single-side power criterion：
Σ Gi + Gm= 1 （11）
Σ Gkj = 0 （12）
Formula (11), (12) are full up foot when, not exclusively mother difference meet operating criterion,
In formula：Gi is that power supply is into and out of linear state on same busbar, and i=1~n, n is no more than 4；
Gkj is feeder fault state on same busbar, and for locking amount, j=1~q, q is not more than 10；K represents outgoing；
In inlet-outlet line Protection criteria, Gm indicates mother state,
Gm=0 indicates that mother does not have electric current to flow through,
Gm <0, indicate that electric current flows to I mothers by mother II,
Gm >0, indicate that electric current flows to II mothers by mother I；
Further, after device meets operating criterion, be delayed 10ms inlet-outlet line supply cell protection acts；
（2）Mother interval Protection criteria
The current status amount that mother interval receives I mothers respectively, mother II is respectively spaced, each section differentiates respectively, inlet-outlet line supply cell ginseng
With action, locking amount is divided between outgoing；When either segment criterion meets, the action of mother interval busbar incomplete differential protection, when
When mother interval is in conjunction position, following criterions are executed：
A) bilateral source criterion：
G1i ≤ 0； (13)
Σ G1kj = 0； (14)
Gm ＜ 0 (15)
Gm ＞ 0 (16)
Formula (13)~(15) are that the female not exclusively female differences of I meet operating criterion,
Formula (13), (14), (16) are that the female not exclusively female differences of II meet operating criterion,
In formula：Gli is that for power supply into and out of linear state, l indicates that busbar number, l=1~2, i indicate that same busbar is enterprising on same busbar
Number of outgoing, i=1~n, n are not more than 4；
Glkj is feeder line state on same busbar, and for locking amount, l indicates busbar number, and l=1~2, j indicates to present on same section of busbar
Number of outgoing, j=1~q, q are not more than 10；K represents outgoing；
B) single-side power criterion：
Gm = 1 (17)
Gli = 0； (18)
Σ Glkj = 0； (19)
In formula：Gi is that power supply is into and out of linear state on same busbar, and i=1~n, n is no more than 4；
Gkj is feeder fault state on same busbar, and for locking amount, j=1~q, q is not more than 10；K represents outgoing；
In the Protection criteria of mother interval, Gm indicates mother state,
Gm ＜ 0 indicate that electric current flows to I mothers by mother II；
Gm ＞ 0 indicate that electric current flows to II mothers by mother I；
When I is female or the mother interval of II mothers meets formula (17), (18), (19), the incomplete bus differential protection action in mother interval.
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| CN105762922B (en) * | 2016-04-07 | 2017-12-15 | 国网江苏省电力公司电力科学研究院 | Based on the hot appraisal procedure of falling operation safety early warning of double-bus every knife Current calculation |
| CN107591784B (en) * | 2017-08-23 | 2019-03-26 | 中国南方电网有限责任公司 | A kind of distribution statements based on collusion adaptive incomplete differential protection method of route |
| CN113341206B (en) * | 2021-06-21 | 2022-03-04 | 广东电网有限责任公司 | Method and device for determining steps of GIS double-bus parallel current |
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| JP2005312180A (en) * | 2004-04-21 | 2005-11-04 | Hitachi Ltd | Digital protective relay system |
| JP2008220136A (en) * | 2007-03-08 | 2008-09-18 | Meidensha Corp | Protection relay system of distribution system |
| CN104218545A (en) * | 2014-09-17 | 2014-12-17 | 北京天能继保电力科技有限公司 | Digital optical fiber differential protection method based on current state variables |
| CN104362599A (en) * | 2014-11-13 | 2015-02-18 | 国家电网公司 | Method for protecting low-voltage bus of intelligent substation |
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| JP2005312180A (en) * | 2004-04-21 | 2005-11-04 | Hitachi Ltd | Digital protective relay system |
| JP2008220136A (en) * | 2007-03-08 | 2008-09-18 | Meidensha Corp | Protection relay system of distribution system |
| CN104218545A (en) * | 2014-09-17 | 2014-12-17 | 北京天能继保电力科技有限公司 | Digital optical fiber differential protection method based on current state variables |
| CN104362599A (en) * | 2014-11-13 | 2015-02-18 | 国家电网公司 | Method for protecting low-voltage bus of intelligent substation |
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