CN111668801A - Backup protection coordination method and protection system based on channel fault classification - Google Patents

Backup protection coordination method and protection system based on channel fault classification Download PDF

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Publication number
CN111668801A
CN111668801A CN202010396016.4A CN202010396016A CN111668801A CN 111668801 A CN111668801 A CN 111668801A CN 202010396016 A CN202010396016 A CN 202010396016A CN 111668801 A CN111668801 A CN 111668801A
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China
Prior art keywords
channel
protection
fault
backup
optical fiber
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CN202010396016.4A
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Chinese (zh)
Inventor
陈军
黄涛
王伟
赵青春
杨向飞
李奔
杨琪
王玉龙
向博
谈浩
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NR Engineering Co Ltd
State Grid Sichuan Electric Power Co Ltd
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NR Engineering Co Ltd
State Grid Sichuan Electric Power Co Ltd
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Priority to CN202010396016.4A priority Critical patent/CN111668801A/en
Publication of CN111668801A publication Critical patent/CN111668801A/en
Pending legal-status Critical Current

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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
    • H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
    • 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
    • H02H7/261—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 involving signal transmission between at least two stations
    • H02H7/263—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 involving signal transmission between at least two stations involving transmissions of measured values

Abstract

The invention discloses a backup protection coordination method and a backup protection coordination system based on channel fault classification, which specifically comprise the following steps: a sampling module, a channel fault classification module and a backup protection setting optimization module are configured in the power transmission line protection device; the sampling module collects direct current power loss signals of the channel equipment and light intensity received by the optical fiber channel, and transmits the collected information to the fault classification module, and the channel fault classification module monitors the communication channel and the channel equipment and gives a judgment result of whether the channel is in fault and the type of the channel fault; and the backup protection setting optimization module adjusts the setting principle of backup protection according to the classification result of the channel fault, so that the optimal matching between the backup protection of the multi-stage line during the channel fault is realized. When the main protection is lost due to the channel fault of the multi-stage circuit, the quick-action performance of the backup protection is greatly improved on the premise of ensuring the backup protection selectivity, and further the transient stability of the power system under the extreme working condition is improved.

Description

Backup protection coordination method and protection system based on channel fault classification
Technical Field
The invention belongs to the field of relay protection of power systems, and particularly relates to a backup protection coordination method and a backup protection coordination protection system based on channel fault classification.
Background
The relay protection device of the high-voltage transmission line is generally configured with complete main protection and backup protection, wherein the main protection is used for protecting the whole length of the line, and the fault of the line can be quickly, reliably and selectively removed; backup protection is used for backup protection when the primary protection is lost. Theoretically, backup protection between adjacent lines needs to be matched step by step on a threshold value and action time, and the selectivity of fault removal is ensured. However, with the continuous development of power grids in China, the architecture is more and more complex, and the gradual matching of backup protection is more and more difficult. Therefore, the power grid company provides the idea of strengthening the main protection and simplifying the backup protection, and allows the backup protection to perform setting calculation according to an incomplete matching mode.
Although the main protection of the high-voltage transmission line is very complete, the main protection may still be lost under some extreme conditions, such as total station direct current power loss, communication power loss, channel abnormality and the like, and the fault must be removed by means of backup protection. Under the configuration principle of 'simplified backup protection', backup protection of all levels of circuits may lose the matching relationship, thereby causing override trip and enlarging the accident range; secondly, the action time of the current backup protection is generally more than 0.5s, and the quick action of the current backup protection cannot meet the requirement of the high-voltage transmission network on stability when the main protection is lost. Therefore, the research on improving the selectivity and the quick action performance of the backup protection when the main protection is lost has very important practical significance.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a backup protection matching method and a backup protection matching system based on channel fault classification, aiming at solving the problems that the quick-acting property of backup protection in the prior art cannot meet the requirement of a high-voltage transmission network on stability and the like.
The technical scheme is as follows: the invention provides a backup protection coordination method based on channel fault classification, which specifically comprises the following steps:
step 1: detecting whether a direct current power loss signal of channel equipment is a high level or whether the light intensity received by an optical fiber channel is lower than a preset light intensity threshold value, if so, determining that the current channel fault is a first-class fault, wherein the first-class fault is that N optical fiber channels simultaneously have faults, N is more than or equal to N and more than 1, N is the total number of the optical fiber channels, and respectively adjusting the action time of distance backup section protection and zero sequence backup section protection to tz_adj1、t0_adj1(ii) a Otherwise, turning to the step 2;
step 2: if the message received by the optical fiber channel is abnormal and the abnormal time exceeds a preset time threshold value, the current channel fault is determined to be a second type fault, the second type fault is the fault of the optical fiber channel only with the abnormal message, and the action time of distance backup section protection and zero sequence backup section protection is respectively adjusted to tz_adj2、t0_adj2(ii) a Otherwise, determining that the communication channel has no fault, and determining the distance backup section protection and zero sequence backup section protection action time tz_org、t0_orgNo adjustment is made; and t isz_adj1<tz_adj2<tz_org，t0_adj1<t0_adj2<t0_org。
Further, the preset light intensity threshold value is-36 dB.
Further, the preset time threshold is 3 ms.
A protection system of a backup protection coordination method based on channel fault classification comprises a sampling module, a channel fault classification module and a protection setting optimization module; the sampling module collects direct current power-off signals of the channel equipment and light intensity received by the optical fiber channel and transmits the collected information to the channel fault classification module; the channel fault classification module judges the type of the channel fault according to the information transmitted by the sampling module and the message received by the optical fiber channel, and transmits the judged type to the protection setting optimization module, and the protection setting optimization module adjusts the action time of distance backup section protection and zero sequence backup section protection according to the type of the channel fault.
Further, the channel device includes an SDH device, and the direct current loss signal is a direct current signal of the SDH device.
Further, the channel device further includes a digital multiplexing device, and when the channel device includes the digital multiplexing device and the SDH device, the direct current signal of the SDH device and the direct current signal of the digital multiplexing device are used as a direct current power loss signal.
Has the advantages that: when the main protection is lost due to the simultaneous channel fault of the multi-stage circuit, the backup protection method can greatly improve the quick-acting property of the backup protection on the premise of ensuring the backup protection selectivity, so that the transient stability of the power system under the extreme working condition is improved.
Drawings
FIG. 1 is a flow chart of the present invention.
FIG. 2 is a diagram of an application scenario when a failure occurs, wherein (a) is a diagram of a scenario when a channel failure is of a second type; (b) the method is a scene graph when the channel fault is in the first type.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
The key for improving the backup protection action performance is that the range of the line without the main protection can be detected, if the main protection of a certain line is lost, the quick action of the backup protection of the line is only required to be improved; if the main protection of the adjacent lines is lost, the selectivity of the backup protection needs to be guaranteed in addition to taking into account the snap-action of the backup protection. The main protection is lost mostly because the pilot channel of the line has faults, and the line range losing the main protection can be judged by detecting and analyzing the reasons of the channel faults. Starting from the idea, the embodiment provides a backup protection coordination method and a backup protection coordination device based on channel fault classification.
A backup protection coordination method based on channel fault classification mainly comprises the following steps: a sampling module, a channel fault classification module and a protection setting optimization module are configured in the power transmission line protection device; the sampling module collects direct current power-off signals of the channel equipment and the light intensity received by the optical fiber channel, and the channel fault classification module judges whether the channel has faults or not and judges the judgment result of the type of the channel fault according to the information transmitted by the sampling module and the message received by the optical fiber channel; and the backup protection setting optimization module adjusts the setting principle of backup protection according to the classification result of the channel fault, so that the optimal matching between the backup protection of the multi-stage line during the channel fault is realized.
As shown in fig. 1, the specific implementation steps of this embodiment are as follows:
the channel fault classification module detects a direct current power-off signal of the channel equipment, and simultaneously monitors the optical fiber channel of the protection device to receive light intensity and receive messages.
When detecting that the direct current power loss signal of the channel equipment is high level or the light intensity received by the optical fiber channel of the protection device is lower than a preset light intensity threshold (the light intensity threshold set in the embodiment is-36 dB), judging that the channel equipment is a first-class channel fault, wherein the first-class channel fault exists in a plurality of optical fiber channels at the same time; when the channel message is detected to be abnormal and the abnormal time exceeds a preset time threshold (in this embodiment, the time threshold is 3ms), determining that the channel message is a second type of channel fault, where the second type of fault is a fault only existing in the optical fiber channel where the message is abnormal; otherwise, the channel is considered to be fault-free.
The judgment of the message abnormity is based on any one or more conditions of frame loss, error codes or check code errors of the message.
And the backup protection setting optimization module carries out self-adaptive adjustment on the action time of distance backup section protection and zero sequence backup section protection according to the channel fault classification result.
When the channel has no fault, the backup protection fixed value is not adjusted, and the original distance backup section protection and zero sequence backup section protection action time t are keptz_org、t0_orgThe change is not changed; when the channel fault is of a second type, the action time of distance backup section protection and zero sequence backup section protection is respectively adjusted to tz_adj2、t0_adj2(ii) a When the channel fault is in the first class, the action time of distance backup section protection and zero sequence backup section protection is respectively adjusted to tz_adj1、t0_adj1。
Preferably, t isz_adj1、t0_adj1、tz_adj2、t0_adj2The setting can be carried out through the device, and the following constraint conditions are met:
tz_adj1<tz_adj2<tz_org，t0_adj1<t0_adj2<t0_org。
in this embodiment, the channel device is an SDH device or a digital multiplexing device and an SDH device; when the SDH equipment is adopted, the SDH equipment on the two substations are connected through an optical fiber channel; the direct current power loss signal is a direct current signal of the SDH equipment; when the channel equipment comprises digital multiplexing equipment and SDH equipment, the digital multiplexing equipment on each transformer substation is connected with the SDH equipment, the SDH equipment between the two transformer substations is connected through an optical fiber channel, and the direct current power-off signal is the phase or of the direct current signal of the SDH equipment and the direct current signal of the digital multiplexing equipment.
As shown in fig. 2 (a), when a fault occurs at point F1 on the line BC protection channel, the line BC loses the primary protection, and since the fault occurs only on the line BC protection channel, the channel fault classification modules of protection 3 and protection 4 all classify the fault into the second class, and the action time of the distance backup segment protection and the zero sequence backup segment protection are respectively adjusted to tz_adj2、t0_adj2And judging that the channel has no fault by the channel fault classification modules of protection 1 and protection 6, and keeping the original distance backup section protection and zero sequence backup section protection action time tz_org、t0_orgAnd is not changed. Due to tz_adj2<tz_org、t0_adj2<t0_orgWhen a fault occurs at a point K1 on a line BC, distance backup section protection or zero sequence backup section protection of the protections 3 and 4 acts before the protections 1 and 6, so that the quick action of the backup protection is improved while the selectivity is ensured.
As shown in fig. 2 (B), when the channel device of the substation B loses power by direct current, the lines AB and BC lose the main protection at the same time, after the protection 3 receives the channel device direct current loss signal, the channel fault classification module judges that the fault is of the first type, and the action time of the distance backup segment protection and the zero sequence backup segment protection is respectively adjusted to tz_adj1、t0_adj1And protection 1 can not receive the direct current power-off signal of the channel equipment, and can only detect the channel message abnormity, so that the fault is judged to be of the second type, and the action time of distance backup section protection and zero sequence backup section protection is respectively adjusted to tz_adj2、t0_adj2。tz_adj1<tz_adj2，t0_adj1<t0_adj2Similarly, when a fault occurs at a point K1 on a line BC, the distance backup section protection or zero sequence backup section protection of the protection 3 will act before the protection 1, so that the quick action of the backup protection is improved while the selectivity is ensured.
The present invention is not limited to the above embodiments, and the above embodiments are only used for facilitating the understanding of the core idea of the present invention, and any modification or equivalent replacement of the present invention according to the idea of the present invention and any modification made within the specific embodiments and the application scope shall fall within the protection scope of the present invention.

Claims (6)

1. A backup protection coordination method based on channel fault classification is characterized by comprising the following steps:
step 1: detecting whether a DC power-off signal of the channel equipment is high level or whether the light intensity received by the optical fiber channel is lower than a preset valueIf so, determining that the current channel fault is a first-class fault, wherein the first-class fault is the fault existing in N optical fiber channels at the same time, N is more than or equal to N and is more than 1, N is the total number of the optical fiber channels, and the action time of distance backup section protection and zero-sequence backup section protection is respectively adjusted to tz_adj1、t0_adj1(ii) a Otherwise, turning to the step 2;
step 2: if the message received by the optical fiber channel is abnormal and the abnormal time exceeds a preset time threshold value, the current channel fault is determined to be a second type fault, the second type fault is the fault of the optical fiber channel only with the abnormal message, and the action time of distance backup section protection and zero sequence backup section protection is respectively adjusted to tz_adj2、t0_adj2(ii) a Otherwise, determining that the communication channel has no fault, and determining the distance backup section protection and zero sequence backup section protection action time tz_org、t0_orgNo adjustment is made; and t isz_adj1<tz_adj2<tz_org，t0_adj1<t0_adj2<t0_org。
2. The backup protection coordination method based on channel fault classification as claimed in claim 1, wherein said preset light intensity threshold is-36 dB.
3. The backup protection coordination method based on channel fault classification as claimed in claim 1, wherein said preset time threshold is 3 ms.
4. The protection system of the backup protection coordination method based on the channel fault classification is characterized by comprising a sampling module, a channel fault classification module and a protection setting optimization module; the sampling module collects direct current power-off signals of the channel equipment and light intensity received by the optical fiber channel and transmits the collected information to the channel fault classification module; the channel fault classification module judges the type of the channel fault according to the information transmitted by the sampling module and the message received by the optical fiber channel, and transmits the judged type to the protection setting optimization module, and the protection setting optimization module adjusts the action time of distance backup section protection and zero sequence backup section protection according to the type of the channel fault.
5. The protection system of claim 4, wherein the channel device comprises an SDH device, and the DC power-off signal is a DC signal of the SDH device.
6. The protection system of the backup protection coordination method based on channel fault classification as claimed in claim 5, wherein said channel device further comprises a digital multiplexing device, and when the channel device comprises the digital multiplexing device and the SDH device, the direct current signal of the SDH device is taken as the direct current loss signal or the direct current signal of the digital multiplexing device.
CN202010396016.4A 2020-05-12 2020-05-12 Backup protection coordination method and protection system based on channel fault classification Pending CN111668801A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017060217A1 (en) * 2015-10-07 2017-04-13 Ge Aviation Systems Limited Back-up overload protection scheme for solid state power controller
CN107370537A (en) * 2017-06-21 2017-11-21 积成软件有限公司 A kind of detection method of Fibre-optical Pilot Protection
CN109327015A (en) * 2018-09-25 2019-02-12 国网河南省电力公司电力科学研究院 New energy power distribution network back-up protection time limit optimum design method and device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017060217A1 (en) * 2015-10-07 2017-04-13 Ge Aviation Systems Limited Back-up overload protection scheme for solid state power controller
CN107370537A (en) * 2017-06-21 2017-11-21 积成软件有限公司 A kind of detection method of Fibre-optical Pilot Protection
CN109327015A (en) * 2018-09-25 2019-02-12 国网河南省电力公司电力科学研究院 New energy power distribution network back-up protection time limit optimum design method and device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
杨向飞，等: "光纤通道异常时加速线路Ⅱ段后备保护技术", 《电力系统自动化》 *

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