CN114189277A - Channel switching method based on channel quality - Google Patents
Channel switching method based on channel quality Download PDFInfo
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- CN114189277A CN114189277A CN202111344476.3A CN202111344476A CN114189277A CN 114189277 A CN114189277 A CN 114189277A CN 202111344476 A CN202111344476 A CN 202111344476A CN 114189277 A CN114189277 A CN 114189277A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000002159 abnormal effect Effects 0.000 claims abstract description 8
- 238000005070 sampling Methods 0.000 claims description 16
- 230000005856 abnormality Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 5
- 230000009471 action Effects 0.000 abstract description 4
- 230000001360 synchronised effect Effects 0.000 abstract description 3
- 239000013307 optical fiber Substances 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
- H04B10/032—Arrangements for fault recovery using working and protection systems
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
The invention provides a channel switching method based on channel quality, which is used for switching channels based on channel delay and channel quality, wherein two channels are synchronous with the opposite side in the working process and respectively store independent data, so that seamless switching can be realized; when one channel is abnormal and is switched to the other channel, the differential protection performance and the action time are not influenced, and the channel switching generated during any system fault can ensure the protection to act correctly, so that the protection is not rejected or acted wrongly, and the locking cannot be realized in the switching process. When both channels are normal, the channel with short channel delay and better channel quality is selected, so that the quality of differential protection can be improved.
Description
Technical Field
The invention belongs to the technical field of electric power systems, relates to a technology for switching protection channels of an optical fiber longitudinal differential circuit of an electric power system, and particularly relates to a channel switching method based on channel quality.
Background
The optical fiber differential protection device is the main protection of a high-voltage line and uses an optical fiber channel to exchange synchronous data on two sides. The synchronization of the data is achieved by a sampling instant adjustment method. For double-end current differential protection or double-end longitudinal distance protection, a double-channel parallel working mode can be selected for improving reliability. As shown in FIG. 3, both channel one and channel two are launched.
When the double channels work in parallel, one of the double channels is a main channel, and the other one is a hot standby channel. Under normal conditions, the device receives the opposite side information amount through the main channel, and when the main channel is abnormal or the channel quality is reduced, the standby channel is switched to work. And when the communication of the working channel is interrupted, such as error code or frame loss or forced exit of the working channel due to regular check and bypass, the standby channel is immediately switched. Channel switching causes a change in channel delay resulting in errors in the synchronization calculations, during which the differential protection is locked until the two sides are resynchronized. Which obviously affects the operating quality of the channel. In addition, because the preferred main channel is usually preset in the dual channels, in practical application, we find that the delay of the main channel is sometimes greater than that of the hot standby channel during normal operation, which results in a reduction in the quality of differential protection.
Disclosure of Invention
Aiming at the problem that the differential motion is possibly locked in the double-end differential motion double-channel switching process and the problem that the channel with large delay is possibly the main channel during normal work, so that the differential protection quality is reduced, the invention improves the existing channel switching technology of optical fiber differential protection, provides a channel scheme for seamless switching based on the channel quality, and can improve the differential protection quality during normal work.
In order to achieve the purpose, the invention provides the following technical scheme:
the channel switching method based on the channel quality comprises the following steps:
step 1, two channels are respectively a main channel and a hot standby channel, the two channels receive current sampling values of opposite sides and respectively store the current sampling values in mutually independent memory data areas, and the device normally adopts the sampling values stored in the data areas corresponding to the main channel to complete differential protection;
and 3, when the main channel is abnormal, immediately switching to the hot standby channel, and adopting a corresponding sampling value to complete differential protection.
Further, in the step 3, if the channel delay of the current hot standby channel is shorter than the channel delay of the current main channel with the abnormality, the channel immediately works when being switched to the current hot standby channel; and if the channel delay of the current hot standby channel is longer than the channel delay of the current main channel with the abnormality, switching to the current hot standby channel and waiting for the corresponding sampling data to arrive before working.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention switches channels based on channel delay and channel quality, and the two channels are synchronous with the opposite side in the working process and respectively store independent data, thereby realizing seamless switching; when one channel is abnormal and is switched to the other channel, the differential protection performance and the action time are not influenced, and the channel switching generated during any system fault can ensure the protection to act correctly, so that the protection is not rejected or acted wrongly, and the locking cannot be realized in the switching process. When both channels are normal, the channel with short channel delay and better channel quality is selected, so that the quality of differential protection can be improved.
Drawings
FIG. 1 is a logic diagram of channel switching based on channel quality for parallel operation according to the present invention.
Fig. 2 is a two-channel data stream with different channel delays.
Fig. 3 shows a two-port line dual-channel parallel operation mode.
Detailed Description
The technical solutions provided by the present invention will be described in detail below with reference to specific examples, and it should be understood that the following specific embodiments are only illustrative of the present invention and are not intended to limit the scope of the present invention.
In this example, channel switching based on channel quality is achieved by:
step 1, as shown in fig. 3, the two side devices are connected through two channels, one of which is a main channel and the other is a hot standby channel, but the main channel is not pre-designated; the two channels receive the current sampling values of the opposite sides and respectively store the current sampling values in mutually independent memory data areas, and the device adopts the sampling values stored in the data area corresponding to the main channel to complete differential protection under normal conditions;
in this example, when both channels are working normally, channel 1 in fig. 3 is the currently working main channel, and channel 2 is the hot standby channel.
And 3, when the working main channel is abnormal, immediately switching to the hot standby channel, and finishing differential protection by adopting a sampling value corresponding to the hot standby channel. Specifically, when channel 1 is abnormal, if channel 2 delay is shorter than channel 1 delay as shown in fig. 2, channel 2 will work immediately when switched to channel 2; when the channel delay of the channel 2 is longer than the channel delay of the channel 1, the channel 1 needs to wait for the corresponding sampling data to arrive after being switched to the channel 2, but the channel 2 needs to work after being switched to the channel 2, and the extra delay of the channel 2 causes the same action time as that of the channel 2 serving as the differential protection communication channel. The decision logic is shown in fig. 1. Obviously, the quality of the differential protection is related to the channel delay, and the shorter the delay, the faster the protection action.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.
Claims (2)
1. The channel switching method based on the channel quality is characterized by comprising the following steps:
step 1, two channels are respectively a main channel and a hot standby channel, the two channels receive current sampling values of opposite sides and respectively store the current sampling values in mutually independent memory data areas, and the device normally adopts the sampling values stored in the data areas corresponding to the main channel to complete differential protection;
step 2, calculating channel delay, and when the two channels are both put into use and work normally, selecting the channel with short channel delay as the current main channel and the other channel as the current hot standby channel;
and 3, when the main channel is abnormal, immediately switching to the hot standby channel, and adopting a corresponding sampling value to complete differential protection.
2. The channel switching method based on channel quality as claimed in claim 1, wherein: in the step 3, if the channel delay of the current hot standby channel is shorter than the channel delay of the current abnormal main channel, the channel immediately works when being switched to the current hot standby channel; and if the channel delay of the current hot standby channel is longer than the channel delay of the current main channel with the abnormality, switching to the current hot standby channel and waiting for the corresponding sampling data to arrive before working.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111344476.3A CN114189277A (en) | 2021-11-15 | 2021-11-15 | Channel switching method based on channel quality |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111344476.3A CN114189277A (en) | 2021-11-15 | 2021-11-15 | Channel switching method based on channel quality |
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| Publication Number | Publication Date |
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| CN114189277A true CN114189277A (en) | 2022-03-15 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101296062A (en) * | 2007-04-28 | 2008-10-29 | 许继集团有限公司 | Double-channel data transmission method in optical fiber longitudinal differential protection |
| US20130262922A1 (en) * | 2012-03-27 | 2013-10-03 | State Grid Corporation Of China | Centralized and networked protection system and method of a regional distribution network |
| CN104393914A (en) * | 2014-11-10 | 2015-03-04 | 国家电网公司 | A multiplex route recovering method for an optical fiber differential protection device |
| CN104538942A (en) * | 2014-12-23 | 2015-04-22 | 国电南瑞科技股份有限公司 | Dual-optical-fiber under-channel longitudinal differential protection and pilot protection integrating method |
| CN111030066A (en) * | 2019-12-18 | 2020-04-17 | 南京国电南自电网自动化有限公司 | Line differential protection method based on switching of optical fiber channel and wireless channel |
-
2021
- 2021-11-15 CN CN202111344476.3A patent/CN114189277A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101296062A (en) * | 2007-04-28 | 2008-10-29 | 许继集团有限公司 | Double-channel data transmission method in optical fiber longitudinal differential protection |
| US20130262922A1 (en) * | 2012-03-27 | 2013-10-03 | State Grid Corporation Of China | Centralized and networked protection system and method of a regional distribution network |
| CN104393914A (en) * | 2014-11-10 | 2015-03-04 | 国家电网公司 | A multiplex route recovering method for an optical fiber differential protection device |
| CN104538942A (en) * | 2014-12-23 | 2015-04-22 | 国电南瑞科技股份有限公司 | Dual-optical-fiber under-channel longitudinal differential protection and pilot protection integrating method |
| CN111030066A (en) * | 2019-12-18 | 2020-04-17 | 南京国电南自电网自动化有限公司 | Line differential protection method based on switching of optical fiber channel and wireless channel |
Non-Patent Citations (1)
| Title |
|---|
| 痕迹资料库: "光纤差动保护原理分析", pages 1, Retrieved from the Internet <URL:http://www.360doc.com/content/12/0121/07/21435004_874606107.shtml> * |
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