CN109884476A - A kind of fault of interconnected transmission line discriminating direction method suitable for double-fed plant-grid connection - Google Patents
A kind of fault of interconnected transmission line discriminating direction method suitable for double-fed plant-grid connection Download PDFInfo
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Abstract
The invention belongs to technical field of power systems; specifically; it is related to a kind of fault of interconnected transmission line discriminating direction method suitable for double-fed plant-grid connection; according to protection installation place positive sequence, negative phase-sequence, residual voltage current value and maximum phase current amplitude and threshold value comparison result; judge whether failure is earthing type failure or symmetric fault, and judges symmetric fault direction and asymmetric earthing fault direction, two-phase short-circuit fault direction in turn.The present invention improves the accuracy differentiated to interconnection fault direction, and electric power netting safe running is effectively ensured.
Description
Technical field
The invention belongs to technical field of power systems, in particular to a kind of connection suitable for double-fed plant-grid connection
Winding thread fault direction method of discrimination.
Background technique
Greatly developing and being gradually improved with new energy technology, using double-fed wind power generator group as the double-fed electricity of representative
Source plant stand obtains large-scale application in power grid.And double-fed power supply plant stand power grid occur short trouble when provide it is short
Road current characteristics has larger difference compared with conventional synchronization generator, so that conventional direction element is applied to collection electric wire and interconnection protection
Shi Wufa correctly judges fault direction, and then may cause relay fail or malfunction.
In view of the above-mentioned problems, having carried out correlative study work, mainly have: whether wind power integration system is suitable for directional element
System is analyzed, and (Chen Linhao, Zhang Jinhua, Zhang Baohui directional element collect the applicability analysis in route in double-fed wind generator field
[J] Proceedings of the CSEE, 2018,38 (21): 6324-6332.), but only demonstrate 90 ° of mode of connection directional elements and exist
Collect the applicability in electric wire, it is not specified that its applicability in interconnection；For the applicability of fault component directional element, mention
A kind of analysis method (Huang Tao, Lu Yuping, Cai Chao .DFIG equivalent sequence Sudden Changing Rate impedance based on equivalent sequence Sudden Changing Rate impedance is gone out
Impact analysis [J] the Proceedings of the CSEE of phase corner characteristics to fault component directional element, 2016,36 (14): 3929-
3939.), but only illustrate positive and negative sequence malfunction directional element applied to wind power integration system there are the problem of, do not suggest that improvement
Method or new criterion.In summary, not perfect for the fault direction method of discrimination research of double-fed plant-grid connection at present, effect
Fruit is limited.
Summary of the invention
The present invention in order to overcome at least one of the drawbacks of the prior art described above, provides one kind and connects suitable for double-fed power supply
The fault of interconnected transmission line discriminating direction method entered improves the method for discrimination to interconnection fault direction, and power grid security fortune is effectively ensured
Row.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: it is a kind of suitable for double-fed plant-grid connection
Fault of interconnected transmission line discriminating direction method, wherein include following steps:
S1: acquisition protection installation place forward-order current I1, positive sequence voltage U1, negative sequence voltage U2, zero-sequence current I0, residual voltage U0
And maximum phase current amplitude
S2: by negative sequence voltage U2With threshold value Uset2Compare, if U2>Uset2Then determine that unbalanced fault, negative phase-sequence has occurred in power grid
Voltage threshold Uset2Range is that 2V-5V enters step S3；If it is not, then determining that symmetric fault occurs for power grid, S6 is entered step；
S3: by residual voltage U0With threshold value Uset0Compare, residual voltage threshold value Uset0Range is 2V-5V, if U0>Uset0Then sentence
Determine power grid and asymmetric ground fault has occurred, into S4；If it is not, then determining that two-phase short-circuit fault occurs for power grid, S5 is entered step；
S4: it carries out asymmetric earthing fault direction and differentiates:
By zero-sequence current I0With threshold value Iset0Compare, if I0>Iset0, defining electric current from double-fed power flow to power grid direction is
Just: ifShow that " forward direction " failure occurs；IfShow that " reversed " failure occurs,For the zero sequence fineness angle of directional element, take
Value is 45 degree, and j is the imaginary part of symbol in vector operation, I0For zero-sequence current；
If I0<Iset0, by maximum phase current amplitudeWith threshold value IsetmaxCompare, ifDetermine electricity
" reversed " failure occurs for net；IfThen determine that " forward direction " failure, threshold value I occur for power gridset0Value is
0.1IN, threshold value IsetmaxValue is 2IN, INFor secondary side current rated value；
S5: two-phase short-circuit fault discriminating direction is carried out:
By maximum phase current amplitudeWith threshold value IsetmaxCompare, ifIt is " anti-to determine that power grid occurs
To " failure；
IfBy forward-order current I1With threshold value Iset1Compare, if I1<Iset1, determine that power grid occurs " just
To " failure；
If I1>Iset1, define electric current and be positive from double-fed power flow to power grid direction: if meeting Show that " forward direction " failure has occurred；If not satisfied, showing that " reversed " failure, threshold value has occurred
Iset1Value is 0.1IN,For the positive sequence fineness angle of directional element, value is 45 degree, I1For forward-order current, INFor secondary side
Current rating；
S6: symmetric fault discriminating direction:
By maximum phase current amplitudeWith threshold value IsetmaxCompare, ifIt is " anti-to determine that power grid occurs
To " failure；
IfBy forward-order current I1With threshold value Iset1Compare, if I1<Iset1, determine that power grid occurs " just
To " failure；
If I1>Iset1, further compare positive sequence voltage U1With threshold value Uset1If U1<Uset1, determine that " forward direction " event occurs for power grid
Barrier；
If U1>Uset1, define electric current and be positive from double-fed power flow to power grid direction: if meetingShow that " forward direction " failure, I has occurred1For forward-order current；If not satisfied, showing to occur
" reversed " failure, threshold value Uset1Value is 0.1~0.15UN, UNFor secondary side voltage rating.
Compared with prior art, the present invention having the following characteristics that
Fault of interconnected transmission line discriminating direction method provided by the invention is obtained using the short circuit current fault signature of double-fed power supply
Respective direction criterion out, can quickly and accurately Judging fault direction, the fault direction of double-fed tie feeder protection can be met
Differentiation demand.
Detailed description of the invention
Fig. 1 is method flow schematic diagram in the embodiment of the present invention.
Fig. 2 is the power system simulation model containing double-fed power electrical field in the embodiment of the present invention.
Specific embodiment
Attached drawing only for illustration, is not considered as limiting the invention；In order to better illustrate this embodiment, attached
Scheme certain components to have omission, zoom in or out, does not represent the size of actual product；To those skilled in the art,
The omitting of some known structures and their instructions in the attached drawings are understandable.Being given for example only property of positional relationship is described in attached drawing
Illustrate, is not considered as limiting the invention.
The same or similar label correspond to the same or similar components in the attached drawing of the embodiment of the present invention；It is retouched in of the invention
In stating, it is to be understood that if the orientation or positional relationship for having the instructions such as term " on ", "lower", "left", "right" is based on attached drawing
Shown in orientation or positional relationship, be merely for convenience of description of the present invention and simplification of the description, rather than indication or suggestion is signified
Device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore positional relationship is described in attached drawing
Term only for illustration, should not be understood as the limitation to this patent, for the ordinary skill in the art, can
To understand the concrete meaning of above-mentioned term as the case may be.
Embodiment:
As shown in Figure 1, the present invention provides the fault of interconnected transmission line discriminating direction method for being suitable for double-fed plant-grid connection,
In, include following steps:
S1: acquisition protection installation place forward-order current I1, positive sequence voltage U1, negative sequence voltage U2, zero-sequence current I0, residual voltage U0
And maximum phase current amplitude
S2: by negative sequence voltage U2With threshold value Uset2Compare, if U2>Uset2Then determine that unbalanced fault, negative phase-sequence has occurred in power grid
Voltage threshold Uset2Range is that 2V-5V enters step S3；If it is not, then determining that symmetric fault occurs for power grid, S6 is entered step；
S3: by residual voltage U0With threshold value Uset0Compare, residual voltage threshold value Uset0Range is 2V-5V, if U0>Uset0Then sentence
Determine power grid and asymmetric ground fault has occurred, into S4；If it is not, then determining that two-phase short-circuit fault occurs for power grid, S5 is entered step；
S4: it carries out asymmetric earthing fault direction and differentiates:
By zero-sequence current I0With threshold value Iset0Compare, if I0>Iset0, defining electric current from double-fed power flow to power grid direction is
Just, ifShow that " forward direction " failure occurs；IfShow that " reversed " failure occurs,For the zero sequence fineness angle of directional element, take
Value is 45 degree, I0For zero-sequence current；
If I0<Iset0, by maximum phase current amplitudeWith threshold value IsetmaxCompare, ifDetermine electricity
" reversed " failure occurs for net；IfThen determine that " forward direction " failure, threshold value I occur for power gridset0Value is
0.1IN, threshold value IsetmaxValue is 2IN, INFor secondary side current rated value；
S5: two-phase short-circuit fault discriminating direction is carried out:
By maximum phase current amplitudeWith threshold value IsetmaxCompare, ifIt is " anti-to determine that power grid occurs
To " failure；
IfBy forward-order current I1With threshold value Iset1Compare, if I1<Iset1, determine that power grid occurs " just
To " failure；
If I1>Iset1, define electric current and be positive from double-fed power flow to power grid direction: if meeting Show that " forward direction " failure has occurred；If not satisfied, showing that " reversed " failure, threshold value has occurred
Iset1Value is 0.1IN,For the positive sequence fineness angle of directional element, value is 45 degree, I1For forward-order current, INFor secondary side
Current rating；
S6: symmetric fault discriminating direction:
By maximum phase current amplitudeWith threshold value IsetmaxCompare, ifIt is " anti-to determine that power grid occurs
To " failure；
IfBy forward-order current I1With threshold value Iset1Compare, if I1<Iset1, determine that power grid occurs " just
To " failure；
If I1>Iset1, further compare positive sequence voltage U1With threshold value Uset1If U1<Uset1, determine that " forward direction " event occurs for power grid
Barrier；
If U1>Uset1, define electric current and be positive from double-fed power flow to power grid direction: if meetingShow that " forward direction " failure has occurred；If not satisfied, showing that " reversed " event has occurred
Barrier, I1For forward-order current, threshold value Uset1Value is 0.1~0.15UN, UNFor secondary side voltage rating.
As shown in Fig. 2, (away from protection 4km) AB two-phase metallicity phase to phase fault occurs for electric network model at f1, power grid is imitative
True mode basic parameter is described as follows:
System side equivalent impedance is z(1)=z(2)=(2.7+15.26j) Ω, z(0)=(6.42+32.12j) Ω.Interconnection L
Length be 8km, unit length line parameter circuit value are as follows: r(1)=r(2)=0.079 Ω/km, x(1)=x(2)=0.39 Ω/km, r(0)=
0.229 Ω/km, x(0)=1.172 Ω/km.The no-load voltage ratio of transformer T1 is 35/0.69kV, and short-circuit impedance 6.5%, capacity is
53MVA；The no-load voltage ratio of transformer T2 is 110/35kV, short-circuit impedance 11.26%, capacity 53MVA.Double-fed power supply is using flat
Weigh Stator-Quantities Control, and power generation capacity is 48MVA.
Below using the fault direction method of discrimination provided by the invention suitable for double-fed plant-grid connection come Judging fault
Direction, specific as follows:
Calculate protection installation place forward-order current I1, positive sequence voltage U1, negative sequence voltage U2, zero-sequence current I0, residual voltage U0And
Maximum phase current amplitude
As shown in Fig. 2, 6 ° of the advanced forward-order current of positive sequence voltage, calculates after failure for the protection installation site in figure
The amplitude of each electricity arrived is as follows:
In upper table, voltage and current value is two sub-values, when specified operation, voltage 100V, electric current 1A.
(1) negative sequence voltage U2With threshold value Uset2Compare size, if Uset25V is taken, by U2>Uset2Judge failure for asymmetric event
Barrier.
(2) residual voltage U0With threshold value Uset0Compare size, if Uset05V is taken, by U0<Uset0Judge that the failure is short for two-phase
Road failure.
(3) by maximum phase current amplitudeWith threshold value IsetmaxCompare size, ifDetermine power grid
" reversed " failure occurs；
IfBy forward-order current I1With threshold value Iset1Compare, if I1<Iset1, determine that power grid occurs " just
To " failure；
If I1>Iset1, further compare positive sequence voltage U1With threshold value Uset1If U1<Uset1, determine that " forward direction " event occurs for power grid
Barrier；
If U1>Uset1, define electric current and be positive from double-fed power flow to power grid direction: if meetingShow that " forward direction " failure has occurred；If not satisfied, showing that " reversed " event has occurred
Barrier.
Assuming that IsetmaxTake 2A, Iset1Take 0.1A, Uset110V is taken,Take 45 °.For protection,I1=0.94 > 0.1=Iset1, U1=51.67 > 10=Uset1AndShow that failure occurs in " forward direction ", eligible result and physical fault direction
Unanimously.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (7)
1. a kind of fault of interconnected transmission line discriminating direction method suitable for double-fed plant-grid connection, which is characterized in that include following
Step:
S1: acquisition protection installation place forward-order current I1, positive sequence voltage U1, negative sequence voltage U2, zero-sequence current I0, residual voltage U0And most
Big phase current magnitude
S2: by negative sequence voltage U2With threshold value Uset2Compare, if U2> Uset2, then determine that unbalanced fault has occurred in power grid, into step
Rapid S3；If it is not, then determining that symmetric fault occurs for power grid, S6 is entered step；
S3: by residual voltage U0With threshold value Uset0Compare, if U0> Uset0, then determine that asymmetric ground fault has occurred in power grid, into
Enter S4；If it is not, then determining that two-phase short-circuit fault occurs for power grid, S5 is entered step；
S4: it carries out asymmetric earthing fault direction and differentiates:
By zero-sequence current I0With threshold value Iset0Compare, if I0> Iset0, it defines electric current and is positive from double-fed power flow to power grid direction, ifShow that " forward direction " failure occurs；IfTable
Bright generation " reversed " failure,For the zero sequence fineness angle of directional element, j is the imaginary part of symbol in vector operation, I0For zero sequence
Electric current；
If I0< Iset0, by maximum phase current amplitudeWith threshold value IsetmaxCompare, ifDetermine power grid hair
Raw " reversed " failure；IfDetermine that " forward direction " failure occurs for power grid；
S5: two-phase short-circuit fault discriminating direction is carried out:
By maximum phase current amplitudeWith threshold value IsetmaxCompare, ifDetermine that " reversed " event occurs for power grid
Barrier；
IfBy forward-order current I1With threshold value Iset1Compare, if I1< Iset1, determine that " forward direction " event occurs for power grid
Barrier；
If I1> Iset1, define electric current and be positive from double-fed power flow to power grid direction: if meeting Show that " forward direction " failure has occurred；If not satisfied, show that " reversed " failure has occurred,
For the positive sequence fineness angle of directional element, I1For forward-order current；
S6: symmetric fault discriminating direction:
By maximum phase current amplitudeWith threshold value IsetmaxCompare, ifDetermine that " reversed " event occurs for power grid
Barrier；
IfBy forward-order current I1With threshold value Iset1Compare, if I1< Iset1, determine that " forward direction " event occurs for power grid
Barrier；
If I1> Iset1, compare positive sequence voltage U1With threshold value Uset1If U1< Uset1, determine that " forward direction " failure occurs for power grid；
If U1> Uset1, define electric current and be positive from double-fed power flow to power grid direction: if meetingShow that " forward direction " failure has occurred；If not satisfied, show that " reversed " failure has occurred,
I1For forward-order current.
2. the fault of interconnected transmission line discriminating direction method according to claim 1 suitable for double-fed plant-grid connection, feature
It is, in the step S2, negative sequence voltage threshold value Uset2Range is 2V-5V.
3. the fault of interconnected transmission line discriminating direction method according to claim 1 suitable for double-fed plant-grid connection, feature
It is, in the step S3, residual voltage threshold value Uset0Range is 2V-5V.
4. the fault of interconnected transmission line discriminating direction method according to claim 1 suitable for double-fed plant-grid connection, feature
It is, in the step S4, threshold value Iset0Value is 0.1IN, threshold value IsetmaxValue is 2IN, INFor secondary side current rated value.
5. the fault of interconnected transmission line discriminating direction method according to claim 1 suitable for double-fed plant-grid connection, feature
It is, in the step S5, wherein threshold value Iset1Value is 0.1IN, INFor secondary side current rated value.
6. the fault of interconnected transmission line discriminating direction method according to claim 1 suitable for double-fed plant-grid connection, feature
It is, in the step S6, threshold value Uset1Value is 0.1~0.15UN, UNFor secondary side voltage rating.
7. the fault of interconnected transmission line discriminating direction method according to claim 1 suitable for double-fed plant-grid connection, feature
It is, it is describedWithIt is 45 degree.
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| CN112485718B (en) * | 2020-12-11 | 2023-02-03 | 深圳供电局有限公司 | Method and device for judging short circuit fault direction of output line of photovoltaic power station |
| WO2024192684A1 (en) * | 2023-03-21 | 2024-09-26 | 西门子股份公司 | Power flow direction determination method and apparatus, electronic device, and readable medium |
| CN117269664A (en) * | 2023-08-18 | 2023-12-22 | 国家电网有限公司华东分部 | Positioning method and device for line fault points of wind power plant and electronic equipment |
| CN117269664B (en) * | 2023-08-18 | 2024-05-03 | 国家电网有限公司华东分部 | Positioning method and device for line fault points of wind power plant and electronic equipment |
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