CN103107522B - A kind of circuit breaker fitting method suppressing electric power system self-excitation - Google Patents
A kind of circuit breaker fitting method suppressing electric power system self-excitation Download PDFInfo
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- CN103107522B CN103107522B CN201310013379.5A CN201310013379A CN103107522B CN 103107522 B CN103107522 B CN 103107522B CN 201310013379 A CN201310013379 A CN 201310013379A CN 103107522 B CN103107522 B CN 103107522B
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Abstract
The present invention relates to power system security and ensure field; be specifically related to a kind of circuit breaker fitting method suppressing electric power system self-excitation; the method comprises and utilizes instrument transformer in electric power system and signal pickup assembly; real-time voltage U 1, U2 to interconnection both sides bus, interconnection both sides circuit breaker folding condition amount and system relay protection trip command carry out gathering and as steps such as input variables.By combined strategies such as the jumping of circuit breaker connection, time delay jumping in evening and overvoltage tripping operations; control the circuit breaker of interconnection both sides between little net and major network; thus reach and avoid little net to be connected with interconnection as far as possible and form lonely situation of netting; or reduce the time that above-mentioned situation continues as far as possible; and when there is overvoltage in system framework last line of defense; timely little network is disconnected; thus reach suppression self-excitation; to the object that intrasystem equipment is protected; and the method does not need to increase unnecessary equipment; there is cost low, the advantage such as easy and simple to handle.
Description
Technical field
The present invention relates to power system security and ensure field, be specifically related to a kind of circuit breaker fitting method suppressing electric power system self-excitation.
Background technology
Along with the propelling that China's remote districts electric power system is built, the island network in many areas is connected with major network gradually.Because these areas are often away from load center, the interconnection of lonely net and major network thus can be caused apart from long.When electric power system is broken down, due to the action of circuit breaker, then likely cause the circuit breaker of long interconnection major network side to disconnect, thus form lonely situation of netting with remote minor scale power net.Due to the charge power of interconnection, then Gu Wangnei small power station unit is very likely caused to produce overvoltage because of self-excitation.
Because self-excitation refer to when generator with capacitive load reach a certain index after, the magnetic assist that capacity current in loop produces can make the terminal voltage of generator increase fast, and the generator voltage raised causes the growth of capacity current, positive feedback effect makes the spontaneous increase of set end voltage, more and more higher, causes device damage; And line-breaker refers to the circuit breaker being arranged on circuit both sides, circuit breaker can close according to instruction, cut-off load current and short circuit current.A lot of scholar conducts in-depth research self-excitation Producing reason, and proposes the method for multiple analysis electric power system self-excitation: as eigenvalue Method, frequency domain analysis method and state-space method etc.These methods can obtain the boundary condition that generating set runs on synchronous self-excitation and asynchronous self-excitation.Meanwhile, some scholars is also had to it is also proposed the measure suppressing self-excitation by dropping into reactor, self-excitation protection and the restriction unit leading phase operation degree of depth etc.
But these methods often need the operational mode of restriction system, or increase the investment of primary side equipment, thus there will be some limitation at electrical network from far-off regions.
Summary of the invention
The object of the present invention is to provide a kind of circuit breaker fitting method suppressing electric power system self-excitation, solve existing electric power system and produce self-excitation to the hurtful problem of equipment after the lonely net of formation.
For solving above-mentioned technical problem, the present invention by the following technical solutions:
Suppress a circuit breaker fitting method for electric power system self-excitation, comprise the following steps:
Utilize the instrument transformer in electric power system and signal pickup assembly, real-time voltage U 1, U2 to interconnection L two side bus, interconnection L both sides circuit breaker folding condition amount and system relay protection trip command carry out gathering and as input variable;
When determining system relay protection, to assign the circuit breaker trip instruction of interconnection L both sides be true time, generates the trip command of little net side circuit breaker K1 at once and export to the communicator of K1, generating t simultaneously in K1 trip command
1after ms, generate the trip command of major network side circuit breaker K2 and export to the communicator of K2;
Do not assign the circuit breaker trip instruction of interconnection L both sides when determining system relay protection, then start to judge in system, whether major network side circuit breaker K2 is in tripping state;
When determining that in system, major network side circuit breaker K2 is in tripping state, time delay t
2after ms, generate the trip command of little net side circuit breaker K1 and export to the communicator of K1;
When determining system major network side circuit breaker K2 and being in closure state, then start to judge whether the voltage effective value U1 of interconnection L little net side bus B1 is more than or equal to overvoltage set point U
set, and continue t
3ms;
If the voltage effective value U1 of interconnection L little net side bus B1 is more than or equal to overvoltage set point U
set, and continue t
3ms, then generate the trip command of little net side circuit breaker K1 and export to the communicator of K1;
If the voltage effective value U1 determining interconnection L little net side bus B1 does not meet being more than or equal to, is namely be less than overvoltage set point U
setcontinue t
3ms, then start to judge whether the voltage effective value U2 of interconnection L major network side bus B2 is more than or equal to overvoltage set point U
set, and continue t
3ms;
If the voltage effective value U2 of interconnection L major network side bus B2 is more than or equal to overvoltage set point U
set, and continue t
3ms, then generate the trip command of major network side circuit breaker K2 and export to the communicator of K2, generating t simultaneously in K2 trip command
2after ms, generate the trip command of little net side circuit breaker K1 and export to the communicator of K1.
Further technical scheme is above-mentioned t
1, t
2, t
3, U
setbe arithmetic number, often need by large net stability after little net stability and three after check single-pole reclosing forever fault and obtain.General, following representative value can be set as: t
1=100, t
2=150 ~ 200, t
3=1000, U
set=(1.25 ~ 1.3) U
n, U
nfor the rated voltage of electric power system.
Compared with prior art, the invention has the beneficial effects as follows: jumped by circuit breaker connection, the combined strategies such as time delay jumping in evening and overvoltage tripping operation, control the circuit breaker of interconnection L both sides between little net and major network, thus reach and avoid little net to be connected with long interconnection L as far as possible and form lonely situation of netting, or reduce the time that above-mentioned situation continues as far as possible, and when there is overvoltage in system framework last line of defense, timely little network is disconnected, thus reach suppression self-excitation, to the object that intrasystem equipment is protected, and the method does not need to increase unnecessary equipment, there is cost low, the advantage such as easy and simple to handle.
Accompanying drawing explanation
Fig. 1 is the annexation figure of minor scale power net and bulk power grid.
Fig. 2 is a kind of schematic flow sheet suppressing a circuit breaker fitting method embodiment of electric power system self-excitation of the present invention.
Fig. 3 is a kind of running environment schematic diagram suppressing another embodiment of circuit breaker fitting method of electric power system self-excitation of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
In Fig. 1, S1: the minor scale power net of remote districts, also exists small generation set and sub-load in this electrical network;
S2: electric power system main grid structure;
L: the interconnection between contact minor scale power net and major network;
B1: interconnection L little net side substation bus bar;
B2: interconnection L major network side substation bus bar;
U1:B1 busbar voltage effective value;
U2:B2 busbar voltage effective value;
K1: little net side circuit breaker, is often installed in the transformer station of interconnection L little Wang side;
K2: major network side circuit breaker, is often installed in the transformer station of interconnection L major network side.
After the lonely net of formation, self-excitation is produced to the hurtful problem of equipment for solving above-mentioned electric power system, Fig. 2 shows that the present invention is a kind of suppresses an embodiment of the circuit breaker fitting method of electric power system self-excitation: a kind of circuit breaker fitting method suppressing electric power system self-excitation, comprises the following steps:
Utilize the instrument transformer in electric power system and signal pickup assembly, real-time voltage U 1, U2 to interconnection L two side bus, interconnection L both sides circuit breaker folding condition amount and system relay protection trip command carry out gathering and as input variable;
When determining system relay protection, to assign the circuit breaker trip instruction of circuit both sides be true time, generates the trip command of little net side circuit breaker K1 at once and export to the communicator of K1, generating t simultaneously in K1 trip command
1after ms, generate the trip command of major network side circuit breaker K2 and export to the communicator of K2;
Do not assign the circuit breaker trip instruction of circuit both sides when determining system relay protection, then start to judge in system, whether major network side circuit breaker K2 is in tripping state;
When determining that in system, major network side circuit breaker K2 is in tripping state, time delay t
2after ms, generate the trip command of little net side circuit breaker K1 and export to the communicator of K1;
When determining system major network side circuit breaker K2 and being in closure state, then start to judge whether the voltage effective value U1 of interconnection L little net side bus B1 is more than or equal to overvoltage set point U
set, and continue t
3ms;
If the voltage effective value U1 of interconnection L little net side bus B1 is more than or equal to overvoltage set point U
set, and continue t
3ms, then generate the trip command of little net side circuit breaker K1 and export to the communicator of K1;
If the voltage effective value U1 determining interconnection L little net side bus B1 does not meet being more than or equal to, is namely be less than overvoltage set point U
setcontinue t
3ms, then start to judge whether the voltage effective value U2 of interconnection L major network side bus B2 is more than or equal to overvoltage set point U
set, and continue t
3ms;
If the voltage effective value U2 of interconnection L major network side bus B2 is more than or equal to overvoltage set point U
set, and continue t
3ms, then generate the trip command of major network side circuit breaker K2 and export to the communicator of K2, generating t simultaneously in K2 trip command
2after ms, generate the trip command of little net side circuit breaker K1 and export to the communicator of K1.
According to a kind of another embodiment suppressing the circuit breaker fitting method of electric power system self-excitation of the present invention: t
1=100, t
2=150 ~ 200, t
3=1000, U
set=(1.25 ~ 1.3) U
n, U
nfor the rated voltage of electric power system.That is t
1, t
2, t
3, U
setbe arithmetic number, need by large net stability after little net stability and three after check single-pole reclosing forever fault and obtain.As shown in Figure 3; the present invention utilizes instrument transformer in electric power system and signal pickup assembly; real-time voltage U 1, U2 to interconnection L two side bus, interconnection L both sides circuit breaker folding condition amount and system relay protection trip command carry out gathering and as input variable.Meanwhile, the output order that can obtain interconnection L both sides circuit breaker K1, K2 that this invention proposes.Killer switch instruction the method obtained, respectively through respective communicator, delivers to the actuator of circuit breaker K1, K2, realizes the disconnection of circuit breaker K1, K2.
Although with reference to multiple explanatory embodiment of the present invention, invention has been described here, but, should be appreciated that, those skilled in the art can design a lot of other amendment and execution mode, these amendments and execution mode will drop within spirit disclosed in the present application and spirit.More particularly, in the scope of, accompanying drawing open in the application and claim, multiple modification and improvement can be carried out to the building block of subject combination layout and/or layout.Except the modification of carrying out building block and/or layout is with except improvement, to those skilled in the art, other purposes also will be obvious.
Claims (2)
1. suppress a circuit breaker fitting method for electric power system self-excitation, it is characterized in that comprising the following steps:
Utilize the instrument transformer in electric power system and signal pickup assembly, real-time voltage U 1, U2 to interconnection L two side bus, interconnection L both sides circuit breaker folding condition amount and system relay protection trip command carry out gathering and as input variable;
When determining system relay protection, to assign the circuit breaker trip instruction of interconnection L both sides be true time, generates the trip command of little net side circuit breaker K1 at once and export to the communicator of K1, generating t simultaneously in K1 trip command
1after ms, generate the trip command of major network side circuit breaker K2 and export to the communicator of K2;
Do not assign the circuit breaker trip instruction of interconnection L both sides when determining system relay protection, then start to judge in system, whether major network side circuit breaker K2 is in tripping state;
When determining that in system, major network side circuit breaker K2 is in tripping state, time delay t
2after ms, generate the trip command of little net side circuit breaker K1 and export to the communicator of K1;
When determining system major network side circuit breaker K2 and being in closure state, then start to judge whether the voltage effective value U1 of interconnection L little net side bus B1 is more than or equal to overvoltage set point U
set, and continue t
3ms;
If the voltage effective value U1 of interconnection L little net side bus B1 is more than or equal to overvoltage set point U
set, and continue t
3ms, then generate the trip command of little net side circuit breaker K1 and export to the communicator of K1;
If determine the voltage effective value U1 of interconnection L little net side bus B1 for being less than overvoltage set point U
setcontinue t
3ms, then start to judge whether the voltage effective value U2 of interconnection L major network side bus B2 is more than or equal to overvoltage set point U
set, and continue t
3ms;
If the voltage effective value U2 of interconnection L major network side bus B2 is more than or equal to overvoltage set point U
set, and continue t
3ms, then generate the trip command of major network side circuit breaker K2 and export to the communicator of K2, generating t simultaneously in K2 trip command
2after ms, generate the trip command of little net side circuit breaker K1 and export to the communicator of K1.
2. a kind of circuit breaker fitting method suppressing electric power system self-excitation according to claim 1, is characterized in that: described t
1=100, t
2=150 ~ 200, t
3=1000, U
set=(1.25 ~ 1.3) U
n, U
nfor the rated voltage of electric power system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310013379.5A CN103107522B (en) | 2013-01-15 | 2013-01-15 | A kind of circuit breaker fitting method suppressing electric power system self-excitation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310013379.5A CN103107522B (en) | 2013-01-15 | 2013-01-15 | A kind of circuit breaker fitting method suppressing electric power system self-excitation |
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| Publication Number | Publication Date |
|---|---|
| CN103107522A CN103107522A (en) | 2013-05-15 |
| CN103107522B true CN103107522B (en) | 2015-07-29 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006018414A1 (en) * | 2004-08-18 | 2006-02-23 | Siemens Aktiengesellschaft | Device for the safe isolation of a nuclear power plant from a supply mains during a mains failure |
| CN102545379A (en) * | 2012-03-08 | 2012-07-04 | 华南理工大学 | Method for casting and canceling 10kV backup automatic switching adaptive up-grade safe and automatic device under unit connection |
| CN102710008A (en) * | 2012-03-08 | 2012-10-03 | 华南理工大学 | Three-bus four-section standby power automatic operation device self-adaption in service and out of service control method |
-
2013
- 2013-01-15 CN CN201310013379.5A patent/CN103107522B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006018414A1 (en) * | 2004-08-18 | 2006-02-23 | Siemens Aktiengesellschaft | Device for the safe isolation of a nuclear power plant from a supply mains during a mains failure |
| CN102545379A (en) * | 2012-03-08 | 2012-07-04 | 华南理工大学 | Method for casting and canceling 10kV backup automatic switching adaptive up-grade safe and automatic device under unit connection |
| CN102710008A (en) * | 2012-03-08 | 2012-10-03 | 华南理工大学 | Three-bus four-section standby power automatic operation device self-adaption in service and out of service control method |
Non-Patent Citations (2)
| Title |
|---|
| 考虑山区小水电的智能型备自投装置的研究;陈志峰等;《电力系统保护与控制》;20100416;第38卷(第8期);第120-122页以及第127页 * |
| 考虑频率波动的水电孤网发电机自励磁研究;张国松等;《电力自动化设备》;20120131;第32卷(第1期);第84-87页以及第111页 * |
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