CN103091601B - A kind of zero-sequence voltage injection accelerated method based on station domain information - Google Patents
A kind of zero-sequence voltage injection accelerated method based on station domain information Download PDFInfo
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- CN103091601B CN103091601B CN201210586934.9A CN201210586934A CN103091601B CN 103091601 B CN103091601 B CN 103091601B CN 201210586934 A CN201210586934 A CN 201210586934A CN 103091601 B CN103091601 B CN 103091601B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000002347 injection Methods 0.000 title claims abstract description 11
- 239000007924 injection Substances 0.000 title claims abstract description 11
- 230000009471 action Effects 0.000 claims abstract description 22
- 230000004807 localization Effects 0.000 claims abstract description 6
- 238000009434 installation Methods 0.000 claims description 4
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- 230000001133 acceleration Effects 0.000 abstract 1
- 238000004364 calculation method Methods 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 3
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Abstract
The invention provides territory, a kind of station zero-sequence voltage injection accelerated method, dropping into discriminating element when gathering when electric current meets the current start element movement adjusted.First calculate the size of each branch road zero-sequence current, utilize fault branch zero-sequence current braning factor maximum principle determination faulty line and fault adjacent lines.Then zero sequence and direction of current, the amplitude of faulty line adjacent legs generating virtual is utilized, in conjunction with the change failure judgement point position of zero sequence and direction of current element.The fault initial stage is when zero sequence and electric current opposite direction, and fault branch electric current is with when calculating close with electric current, and zero-sequenceprotection action, near this side line road head end, can be accelerated in failure judgement point position.Fault mid-term is transferred in the other direction by positive dirction when zero sequence and direction of current, and fault branch electric current is with when calculating close with electric current, localization of faults position at line end, acceleration zero-sequenceprotection action.The present invention differentiates accurately, is easy to realize, and possesses good prospect of the application.
Description
Technical field
The invention belongs to power transmission and transformation field, specifically relate to the zero-sequenceprotection accelerated method based on station domain information.
Background technology
Zero-sequenceprotection is a kind of important earthing short circuit protection, and its structure, principle of work are simple, affect less, be therefore widely used in electric system by transition resistance.Zero-sequenceprotection generally as the back-up protection of circuit, when circuit generation earth fault and main protection akinesia time, with deferred action of adjusting in line switching, isolated fault.The general sensitivity of zero-sequenceprotection is high, but selectivity ratios is poor, and having the greatest impact by electric system changes of operating modes, not easily adjust.Zero sequence I segment protect is adjusted by avoiding external area error maximum zero sequence current; be with a zero-sequence current produced when comparatively short time delay (in 0.2s) is to avoid the operation of circuit three-phase breakers asynchronous closing; but often protection domain is very little, reliably the earth faults such as line end can not be excised.And other segment protect scopes of zero sequence are relatively wide, but in order to prevent back-up protection to bypass the immediate leadership action, general setting time is long, runs into and high resistant or line end earth fault occur, and zero-sequenceprotection can only with comparatively long delay action switch-dividing, isolated fault.Because excision fault is slow, make system occur vibration under serious conditions, even cause the situations such as system sectionalizing, bring very large harm to Operation of Electric Systems.How under reliable prerequisite, the actuation time of accelerating zero-sequenceprotection is the focus of research always.This project utilizes the simple feature of zero-sequenceprotection design itself exactly; combining station territory each associated branch zero-sequence current information; the change of total calculation analysis grounding point position and the relation of zero-sequence current sequence net changes in distribution; obtain a kind of method can accelerating zero-sequenceprotection action, bring favorable influence for power system safety and stability runs.
Summary of the invention
For overcoming the above problem that prior art exists, this application provides territory, a kind of station zero-sequence voltage injection accelerated method, when an error occurs by calculating the size of each branch road zero-sequence current, determining the circuit that may break down.Then faulty line adjacent legs zero sequence and sense of current, amplitude is calculated, in conjunction with the change failure judgement point position of zero sequence and electric current.Accelerate zero-sequenceprotection element according to analysis result, excise fault rapidly, bring favorable influence to power transmission and transformation system.The application is concrete by the following technical solutions:
Based on a zero-sequence voltage injection accelerated method for station domain information, it is characterized in that, described computing method comprise the following steps:
(1). when fault occurs, calculate the zero-sequence current I of each branch road based on station domain information
i(i=1,2 ... n), voltage transformer (VT) installation place residual voltage U
0;
(2). the amplitude of each branch road zero-sequence current on more same bus, choose I
n=max{I
1, I
2... I
n, work as I
n>I
qdand this branch road zero sequence direction is when being positive dirction, judge that this N branch road is higher level's branch road of fault branch or fault, wherein, described I
qdfor starting current threshold value;
(3). calculate other branch road zero sequence and electric current I except higher level's branch road of the fault branch determined according to step (2) or the fault determined on same bus
s,
and calculate zero sequence and direction of current
(4). when the zero sequence calculated according to step (3) and direction of current are in the other direction, and | I
s|=| I
n|, then failure judgement point position is near this side fault branch head end, accelerates zero-sequenceprotection action;
(5). when the zero sequence calculated according to step (3) and direction of current are positive dirction, then failure judgement point position is away from this side fault branch head end, can not accelerate zero-sequenceprotection action;
(6). when the zero sequence calculated according to step (3) and direction of current are transferred in the other direction by positive dirction, and | I
s|=| I
n|, then failure judgement branch road opposite end switch trip, zero-sequenceprotection action, at fault branch end, is accelerated in localization of faults position.
The computing method of the first preferred version provided by the invention, its improvements are, when the fault initial stage
when being in the other direction, and | I
s|=| I
n|, zero-sequenceprotection action, near this side faulty line head end, can be accelerated in failure judgement point position.When fault mid-term
transferred in the other direction by positive dirction, and | I
s|=| I
n|, failure judgement circuit opposite end switch trip, zero-sequenceprotection action, at faulty line end, is accelerated in localization of faults position.
The computing method of the second preferred version provided by the invention, its improvements are, the described zero-sequence current of step (2) starts definite value I
qdbe set by the user; The amplitude of more each branch road zero-sequence current, chooses I
n=max{I
1, I
2... I
n, I
n>I
qdand this branch road zero sequence direction is positive dirction, judge that N branch road is the upstream branch of branch road or the fault that possible break down.
The computing method of the 3rd preferred version provided by the invention, its improvements are, step (3) calculates faulty line adjacent legs (being namely connected to the fault branch judged except step (2) on same bus or other branch road except fault upstream branch) zero sequence and electric current
calculate zero sequence and direction of current
The computing method of the 4th preferred version provided by the invention, its improvements are, described electric current I
iit is the i-th branch road zero-sequence current; Described electric current U
0it is the residual voltage of voltage transformer (VT) installation place; F
szero sequence and sense of current.
Compared with the prior art, the beneficial effect of the application is:
A kind of zero-sequence voltage injection accelerated method based on station domain information that the application provides; collection can be carried out to each branch road zero-sequence current in station fast to calculate; effectively can identify fault branch; calculate faulty line adjacent legs zero sequence and direction of current; and accordingly analysis of failure point position whether on the faulty line chosen; accelerate zero-sequenceprotection action if desired, bring favorable influence to power transmission and transformation system.
The application adopts the amplitude of more each branch road zero-sequence current, chooses I
n=max{I
1, I
2... I
n, I
n>I
qdand the branch road that this branch road zero sequence direction is positive dirction is fault branch or the branch road near trouble spot.Calculate adjacent legs zero sequence and direction of current Judging fault point position accordingly.Computation model simplicity of design, Fault Identification realizes quick.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of zero-sequence current direction protection accelerated method disclosed in the present application.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
When electrical network generation earth fault, zero sequence sequence diagrams shows that the change along with earth point position changes, the zero-sequence current direction of stand internal fault circuit and adjacent lines with faulty line two end switch deciliter also in change.According to zero sequence electrical network, when fault occurs, zero-sequence current direction is for flow to system from trouble spot, and when line end generation earth fault, after the excision of opposite end line switching, zero sequence direction change is from faulty line head end, and adjacent legs generation homopolar power leads.Can failure judgement point position according to zero-sequence current direction, confirm that position of failure point is when faulty line, accelerates zero-sequenceprotection action, excision fault, safeguards power system stability.
As shown in Figure 1, based on the zero-sequence voltage injection accelerated method of station domain information, comprise the following steps:
(1). when fault occurs, calculate the zero-sequence current I of each branch road based on station domain information
i(i=1,2 ... n), voltage transformer (VT) installation place residual voltage U
0;
(2). the amplitude of each branch road zero-sequence current on more same bus, choose I
n=max{I
1, I
2... I
n, work as I
n>I
qdand this branch road zero sequence direction is when being positive dirction, judge that N branch road is fault branch or higher level's branch road, wherein, described I
qdfor starting current threshold value;
(3). calculate according to other branch road zero sequence and the electric current on the determined same bus of step (2) except faulty line,
And calculate zero sequence and direction of current
(4). when the zero sequence calculated according to step (3) and direction of current are in the other direction (general is-160 ° of C<Fs<0 ° of C in the other direction between active region), and | I
s|=| I
n|, then failure judgement point position is near this side faulty line head end, can accelerate zero-sequenceprotection action;
(5). when the zero sequence calculated according to step (3) and direction of current are positive dirction (being 20 ° of C<Fs<180 ° of C between general positive dirction active region), then failure judgement point position is away from this side faulty line head end, can not accelerate zero-sequenceprotection action;
(6). when the zero sequence calculated according to step (3) and direction of current are transferred in the other direction by positive dirction, and | I
s|=| I
n|, then failure judgement circuit opposite end switch trip, zero-sequenceprotection action, at faulty line end, is accelerated in localization of faults position.
In the present embodiment, first set each node of electrical network and branch road information table, when fault occurs, calculate each branch road zero-sequence current, node voltage according to information table; The amplitude of more each branch road zero-sequence current, chooses I
n=max{I
1, I
2... I
n, I
n>I
qdand this branch road zero sequence direction is positive dirction, judge that N branch road is the branch road that possible break down; Calculate faulty line adjacent legs zero sequence and electric current,
calculate zero sequence and direction of current
calculating zero sequence and direction of current are in the other direction, and | I
s|=| I
n|, zero-sequenceprotection action, near this side faulty line head end, can be accelerated in failure judgement point position; Calculating zero sequence and direction of current are positive dirction, and zero-sequenceprotection action, away from this side faulty line head end, can not be accelerated in failure judgement point position; Calculating zero sequence and direction of current are transferred in the other direction by positive dirction, and | I
s|=| I
n|, failure judgement circuit opposite end switch trip, zero-sequenceprotection action, at faulty line end, is accelerated in localization of faults position.
It is to be understood that content of the present invention and embodiment are intended to the practical application proving technical scheme provided by the present invention, should not be construed as limiting the scope of the present invention.Those skilled in the art inspired by the spirit and principles of the present invention, can do various amendment, equivalent replacement or improve.But these changes or amendment are all in the protection domain that application is awaited the reply.
Claims (4)
1., based on a zero-sequence voltage injection accelerated method for station domain information, it is characterized in that, said method comprising the steps of:
(1). when fault occurs, calculate the zero-sequence current I of each branch road based on station domain information
i(i=1,2 ... n), voltage transformer (VT) installation place residual voltage U
0;
(2). the amplitude of each branch road zero-sequence current on more same bus, choose I
n=max{I
1, I
2... I
n, work as I
n>I
qdand this branch road zero sequence direction is when being positive dirction, judge that this N branch road is higher level's branch road of fault branch or fault, wherein, described I
qdfor starting current threshold value;
(3). calculate other branch road zero sequence and electric current I except higher level's branch road of the fault branch determined according to step (2) or the fault determined on same bus
s,
and calculate zero sequence and direction of current
(4). when the zero sequence calculated according to step (3) and direction of current are in the other direction, and | I
s|=| I
n|, then failure judgement point position is near this side fault branch head end, accelerates zero-sequenceprotection action;
(5). when the zero sequence calculated according to step (3) and direction of current are positive dirction, then failure judgement point position is away from this side fault branch head end, can not accelerate zero-sequenceprotection action;
(6). when the zero sequence calculated according to step (3) and direction of current are transferred in the other direction by positive dirction, and | I
s|=| I
n|, then failure judgement branch road opposite end switch trip, zero-sequenceprotection action, at fault branch end, is accelerated in localization of faults position.
2. the zero-sequence voltage injection accelerated method based on station domain information according to claim 1, is characterized in that:
Described I
qdbe set by the user.
3. the zero-sequence voltage injection accelerated method based on station domain information according to claim 1, is characterized in that:
Zero sequence and direction of current are in the other direction in following scope,
-160℃<Fs<0℃。
4. the zero-sequence voltage injection accelerated method based on station domain information according to claim 1, is characterized in that:
Zero sequence and direction of current are positive dirction in following scope,
20℃<Fs<180℃。
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1858953A (en) * | 2006-06-02 | 2006-11-08 | 北京四方继保自动化股份有限公司 | Protective method for zero sequence power direction based on local zero sequence compensation |
| CN102611083A (en) * | 2012-03-07 | 2012-07-25 | 广东电网公司东莞供电局 | Method for implementing adaptive zero sequence current network protection |
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| HUP0700837A2 (en) * | 2007-12-21 | 2009-08-28 | Andras Dr Dan | Measuring system for localising and identifying a resistance of earth fault in active network and method for using the system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1858953A (en) * | 2006-06-02 | 2006-11-08 | 北京四方继保自动化股份有限公司 | Protective method for zero sequence power direction based on local zero sequence compensation |
| CN102611083A (en) * | 2012-03-07 | 2012-07-25 | 广东电网公司东莞供电局 | Method for implementing adaptive zero sequence current network protection |
Non-Patent Citations (2)
| Title |
|---|
| 单相重合闸自适应零序电流加速保护方案;杨涛等;《继电器》;20040701;第32卷(第13期);第59-62页 * |
| 纵联零序方向保护误动原因分析及其对策;汪萍等;《电力自动化设备》;20070731;第27卷(第7期);第122-125页 * |
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