CN113013852B - Line protection optical fiber channel transmission data processing method and device - Google Patents
Line protection optical fiber channel transmission data processing method and device Download PDFInfo
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- CN113013852B CN113013852B CN202110221250.8A CN202110221250A CN113013852B CN 113013852 B CN113013852 B CN 113013852B CN 202110221250 A CN202110221250 A CN 202110221250A CN 113013852 B CN113013852 B CN 113013852B
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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
- 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
- H02H1/0069—Details of emergency protective circuit arrangements concerning transmission of signals by means of light or heat rays
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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
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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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
- 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
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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
- 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
- H04B10/25—Arrangements specific to fibre transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
Abstract
The invention discloses a method and a device for processing transmission data of a line protection optical fiber channel, which comprises the following steps: acquiring a data frame format value in a communication message sent by the opposite side; when the numerical value is a first preset numerical value, the devices on the two sides of the optical fiber channel regularly transmit sampling data and switching value data after sampling is interrupted; when the numerical value is a second preset numerical value, sending the sampling data and the sampling sequence number of the previous frame with abnormal verification and the sampling data of the current frame to the opposite side; when the value is a third preset value, carrying out phasor calculation on the sampling data of 1/4 cycle before the abnormal frame, sending the real part and the imaginary part of the three-phase current and the corresponding sampling serial number to the opposite side, and using current phasor of 1/4 cycle of current on the same side and the opposite side the differential current and the braking current for differential protection are synthesized. By sending sampling data after sampling interruption, when 2 times of continuous data abnormality is detected, phasor is calculated by using a short window algorithm and transmitted to the opposite side, so that the influence of accidental communication abnormality of the optical fiber channel on differential protection is reduced.
Description
Technical Field
The invention relates to the technical field of high-voltage transmission line protection, in particular to a method and a device for processing transmission data of a line protection optical fiber channel.
Background
At present, the optical fiber differential protection principle is commonly adopted for protecting the high-voltage power grid transmission line in China, and the differential protection has the advantages of good selectivity, high action speed and the like, and plays an important role in protecting the safety of a power grid.
However, in the field operation process, due to electromagnetic interference and other reasons, the optical fiber communication may be abnormal, which may cause the differential protection to be locked, and in severe cases, the differential protection may be rejected due to a fault.
Disclosure of Invention
The embodiment of the invention aims to provide a method and a device for processing transmission data of a line protection optical fiber channel, aiming at the condition that differential protection is locked after the data of the optical fiber channel is abnormal, the method and the device reduce the influence of accidental communication abnormality of the optical fiber channel on the differential protection by sending sampling points after each sampling interruption and calculating phasor by using a short window algorithm and transmitting the phasor to the opposite side when the data is detected to be abnormal.
To solve the foregoing technical problem, a first aspect of an embodiment of the present invention provides a method for processing data transmitted by a line protection optical fiber channel, including the following steps:
acquiring a numerical value of a data frame format in the opposite-side communication message through the optical fiber channel;
when the value of the data frame format is a first preset value, the devices on the two sides of the optical fiber channel regularly send sampling data and switching value data after each sampling is interrupted, and the sampling data on the current side and the received sampling data on the opposite side are utilized to synthesize differential current and braking current;
when the value of the data frame format is a second preset value, sending the sampling data and the sampling serial number which are abnormal in the previous frame and the sampling data of the current frame to the opposite side through a plurality of preset first data bits of the sampling data, and synthesizing differential current and braking current for differential protection by the devices on the two sides of the optical fiber channel by utilizing the sampling data of the current side and the opposite side;
and when the numerical value of the data frame format is a third preset numerical value, carrying out phasor calculation on the sampled data of 1/4 cycle before the abnormal frame to obtain a real part and an imaginary part of the three-phase current, sending the real part and the imaginary part of the three-phase current and corresponding sampling serial numbers to the opposite side through a plurality of preset first data bits and a plurality of preset second data bits of the data, and synthesizing differential current and braking current for differential protection by using current phasors of the 1/4 cycle of the local side and the opposite side by using devices on the two sides of the optical fiber channel.
Further, after obtaining the value of the data frame format in the opposite-side sampled data through the fiber channel, the method further includes:
acquiring a numerical value of the data frame format;
judging whether the numerical value of the data frame format is the third preset numerical value or not;
when the value of the data frame format is the third preset value, acquiring the current phasor of the short window transmitted by the opposite side and the current phasor of the local side to synthesize a differential current and a brake current, and completing a differential protection function by adopting the short window within a first preset time length;
and after the first preset time, when the sampling data is always normal, switching to calculating differential current and braking current by adopting the sampling data on the opposite side and the sampling data on the local side so as to complete differential protection.
Further, the phasor calculation for the sampling data of 1/4 cycle before the abnormal frame includes:
setting the number of sampling points in each sampling period as N;
for the short window data of a first preset time length, the real part of the three-phase current is as follows:
and, the imaginary part of the three-phase current is:
wherein x is l The l-th sampling point representing the input signal;
then, the phasor calculation formula sent to the opposite side is:
further, before obtaining the value of the data frame format in the opposite-side sampled data through the fiber channel, the method further includes:
performing CRC on the sampling data received through the optical fiber channel;
when the CRC check is error-free, setting the data frame format value as the first preset value;
setting the data frame format value to the second preset value when the CRC check includes a single error;
and when the CRC check comprises two continuous errors, setting the data frame format value as the third preset value.
Further, the line protection fibre channel transmission data processing method further includes:
locking the differential protection when the CRC check includes three consecutive errors.
Accordingly, a second aspect of the embodiments of the present invention provides a line protection fiber channel transmission data processing apparatus, including:
a first obtaining module, configured to obtain, through the fibre channel, a value of a data frame format in a contralateral communication message;
the first control module is used for sending sampling data and switching value data at regular time after each sampling interruption by the devices on both sides of the optical fiber channel when the numerical value of the data frame format is a first preset numerical value, and synthesizing differential current and braking current by utilizing the sampling data on the current side and the sampling data on the opposite side;
the second control module is used for sending the sampling data and the sampling serial number which are abnormal in the previous frame and the sampling data of the current frame to the opposite side through a plurality of preset first data bits of the sampling data when the numerical value of the data frame format is a second preset numerical value, and the devices on the two sides of the optical fiber channel synthesize differential current and braking current for differential protection by using the sampling data of the current side and the sampling data of the opposite side;
and the third control module is used for carrying out phasor calculation on the sampled data of 1/4 cycle before the abnormal frame when the numerical value of the data frame format is a third preset numerical value so as to obtain a real part and an imaginary part of the three-phase current, sending the real part and the imaginary part of the three-phase current and corresponding sampling serial numbers to the opposite side through a plurality of preset first data bits and a plurality of preset second data bits of the data, and synthesizing the differential current and the brake current for differential protection by using the current phasors of the 1/4 cycle received by the local side and the opposite side by the devices on the two sides of the optical fiber channel.
Further, the line protection optical fiber channel transmission data processing device further includes:
a second obtaining module, configured to obtain a value of the data frame format;
the first judging module is used for judging whether the value of the data frame format is the third preset value or not;
the fourth control module is used for acquiring the current phasor of the short window transmitted by the opposite side and the current phasor of the local side to synthesize a differential current and a braking current when the numerical value of the data frame format is the third preset numerical value, and the short window is adopted to complete the differential protection function within a first preset time period;
and the fifth control module is used for switching to the calculation of the differential current and the braking current by adopting the sampling data of the opposite side and the sampling data of the local side after the first preset time length when the sampling data is always normal so as to complete the differential protection.
Further, the third control module includes: a setting unit and a calculating unit;
the setting unit is used for setting the number of sampling points in each sampling period to be N;
the calculating unit is used for calculating the real part of the three-phase current for the short window data of a first preset time length:
and calculating the imaginary part of the three-phase current as:
wherein x is l The l-th sampling point representing the input signal;
and calculating the phasor sent to the opposite side as:
further, the line protection fibre channel transmission data processing apparatus further includes:
the data checking module is used for checking the sampling data received through the optical fiber channel;
a setting module, configured to set the data frame format value to the first preset value when a CRC check is error-free, further configured to set the data frame format value to the second preset value when the CRC check includes a single error, and further configured to set the data frame format value to the third preset value when the CRC check includes two consecutive errors.
Further, the line protection fibre channel transmission data processing apparatus further includes:
a sixth control module to latch the differential protection when the CRC check includes three consecutive errors.
Accordingly, a third aspect of an embodiment of the present invention provides an electronic device, including: at least one processor; and a memory coupled to the at least one processor; the memory stores instructions executable by the processor, and the instructions are executed by the processor to cause the at least one processor to execute the line protection fibre channel transmission data processing method.
In addition, a fourth aspect of the embodiments of the present invention further provides a computer-readable storage medium, on which computer instructions are stored, and when the instructions are executed by a processor, the method for processing line protection fibre channel transmission data is implemented.
The technical scheme of the embodiment of the invention has the following beneficial technical effects:
aiming at the condition that the differential protection is locked after the data of the optical fiber channel is abnormal, the sampling points are sent after each sampling is interrupted, and when the data is detected to be abnormal, the phasor is calculated by using a short window algorithm and is transmitted to the opposite side, so that the influence of the accidental communication abnormality of the optical fiber channel on the differential protection is reduced.
Drawings
Fig. 1 is a schematic diagram of protection of a high-voltage transmission line according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for processing data transmitted by a line protection fibre channel according to an embodiment of the present invention;
fig. 3 is a logic diagram of a method for processing data transmitted by a line protection fiber channel according to an embodiment of the present invention;
fig. 4a is a schematic diagram of a data frame when the sampling data of the fiber channel is normal according to an embodiment of the present invention;
fig. 4b is a schematic diagram of a data frame when sampling data of the fibre channel is abnormal according to an embodiment of the present invention;
fig. 4c is a schematic diagram of a data frame when the sampling data of the fiber channel are continuously abnormal according to an embodiment of the present invention;
fig. 5 is a block diagram of a line protection fibre channel transmission data processing apparatus according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a third control module according to an embodiment of the present invention.
Reference numerals are as follows:
1. the device comprises a first acquisition module, a second acquisition module, a first control module, a second control module, a third control module, a setting unit, a calculating unit, a second acquisition module, a first judgment module, a fourth control module, a fifth control module, a sixth control module, a data checking module, a setting module and a data checking module, wherein the first acquisition module 2, the first control module 3, the second control module 4, the third control module 41, the setting unit 42, the calculating unit 5, the second acquisition module 6, the first judgment module 7, the fourth control module 8, the fifth control module 9, the sixth control module 10, the data checking module 11 and the setting module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the accompanying drawings in combination with the embodiments. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Fig. 1 is a schematic diagram of protection of a high-voltage transmission line provided by an embodiment of the invention.
Fig. 2 is a flowchart of a method for processing data transmitted through a line protection fibre channel according to an embodiment of the present invention.
Fig. 3 is a logic diagram of a method for processing data transmitted through a line protection fibre channel according to an embodiment of the present invention.
Fig. 4a is a schematic diagram of a data frame when the fiber channel sampling data provided by the embodiment of the present invention is normal.
Fig. 4b is a schematic diagram of a data frame when sampling data of the fibre channel is abnormal according to an embodiment of the present invention.
Fig. 4c is a schematic diagram of a data frame when the sampling data of the fibre channel is continuously abnormal according to the embodiment of the present invention.
Referring to fig. 1, fig. 2, fig. 3, fig. 4a, fig. 4b, and fig. 4c, a first aspect of an embodiment of the present invention provides a method for processing line protection fiber channel transmission data, including the following steps:
and S200, acquiring the numerical value of the data frame format in the opposite side communication message through the fiber channel.
And S300, when the numerical value of the data frame format is a first preset numerical value, the devices on the two sides of the optical fiber channel regularly send sampling data and switching value data after each sampling is interrupted, and the sampling data on the current side and the received sampling data on the opposite side are utilized to synthesize differential current and braking current.
Specifically, when the sampling data is normal, the data frame format is as shown in fig. 4 a.
S400, when the value of the data frame format is a second preset value, the sampling data and the sampling serial number of the previous frame abnormal verification and the sampling data of the frame are sent to the opposite side through a plurality of preset first data bits of the sampling data, and the devices on the two sides of the optical fiber channel synthesize differential current and braking current for differential protection by using the sampling data of the side and the opposite side.
Specifically, when the value of the data frame format is the second preset value, and when the data framing is sent, the switching value 1-3 is not transmitted in the data frame, and the sampling data and the sampling serial number which are abnormal in the previous frame and the new sampling data of the current time are sent to the opposite side at the same time by using 6 bytes of the switching value 1-3.
S500, when the value of the data frame format is a third preset value, phasor calculation is carried out on the sampled data of 1/4 cycle before the abnormal frame to obtain the real part and the imaginary part of the three-phase current, the real part and the imaginary part of the three-phase current and the corresponding sampling serial number are sent to the opposite side through a plurality of preset first data bits and a plurality of preset second data bits of the data, and the differential current and the brake current for differential protection are synthesized by the devices on the two sides of the optical fiber channel by utilizing the current phasors of the 1/4 cycle on the local side and the opposite side.
Specifically, when the value of the data frame format is a second preset value, and when a data framing is sent, the switching value 1-6 is not transmitted in the data frame, phasor calculation is performed by using a sampling point of 1/4 cycle before the abnormal frame, and the calculated real part and imaginary part of the three-phase current and the corresponding sampling serial number are sent to the opposite side.
Specifically, after the above process is completed, obtaining the value of the data frame format in the opposite side sampling data through the optical fiber channel is completed, and the method further includes the steps of:
s610, acquiring a numerical value of a data frame format.
S620, determine whether the value of the data frame format is a third preset value.
And S630, when the value of the data frame format is a third preset value, obtaining the current phasor of the short window transmitted by the opposite side and the current phasor of the local side to synthesize a differential current and a braking current, and finishing the differential protection function by adopting the short window within a first preset time length.
And S640, after the first preset time, when the sampling data is always normal, switching to calculating the differential current and the braking current by adopting the opposite side sampling data and the local side sampling data to complete differential protection.
Optionally, the first preset time period has a value of 10ms.
Specifically, in step S400, the phasor calculation for the sampling data of 1/4 cycle before the abnormal frame specifically includes:
s510, the number of sampling points per sampling period is set to N.
S520, for the short window data with the first preset duration, the real part of the three-phase current is as follows:
and, the imaginary part of the three-phase current is:
wherein x is l The l-th sampling point representing the input signal;
then, the phasor calculation formula sent to the opposite side is:
in addition, in step S200, before obtaining the value of the data frame format in the opposite-side sampled data through the optical fiber channel, the method further includes:
s110, CRC check is carried out on the sampling data received through the optical fiber channel.
And S120, when the CRC check is error-free, setting the format value of the data frame to be a first preset value.
Optionally, the value of the first preset value is 0.
S130, when the CRC check includes a single error, setting the data frame format value to a second preset value.
Optionally, the second preset value is 1.
S140, when the CRC check includes two consecutive errors, setting the data frame format value to a third preset value.
Optionally, the third preset value is 2.
Further, step S140 is followed by the following steps:
s150, when the CRC check comprises three continuous errors, locking the differential protection.
Fig. 5 is a block diagram of a line protection fibre channel transmission data processing apparatus according to an embodiment of the present invention.
Accordingly, referring to fig. 5, a second aspect of the embodiments of the present invention provides a line protection optical fiber channel transmission data processing apparatus, including: the device comprises a first acquisition module 1, a first control module 2, a second control module 3 and a third control module 4. The first obtaining module 1 is configured to obtain a numerical value of a data frame format in the opposite-side communication message through the optical fiber channel; the first control module 2 is used for sending sampling data and switching value data at regular time after each sampling interruption by the devices on both sides of the optical fiber channel when the value of the data frame format is a first preset value, and synthesizing differential current and braking current by using the sampling data on the current side and the sampling data on the opposite side; the second control module 3 is used for sending the sampling data and the sampling serial number of the previous frame abnormal verification and the sampling data of the frame to the opposite side through a plurality of preset first data bits of the sampling data when the value of the data frame format is a second preset value, and the devices on the two sides of the optical fiber channel synthesize differential current and braking current for differential protection by using the sampling data of the side and the opposite side; the third control module 4 is configured to, when the value of the data frame format is a third preset value, perform phasor calculation on the sampled data of the 1/4 cycle before the abnormal frame to obtain a real part and an imaginary part of the three-phase current, send the real part and the imaginary part of the three-phase current and the corresponding sampling serial number to the opposite side through a plurality of preset first data bits and a plurality of preset second data bits of the data, and synthesize a differential current and a brake current for differential protection by the devices on the two sides of the optical fiber channel using the current phasors of the 1/4 cycle received by the local side and the opposite side.
Specifically, the line protection optical fiber channel transmission data processing apparatus further includes: the device comprises a second acquisition module 5, a first judgment module 6, a fourth control module 7 and a fifth control module 8. The second obtaining module 5 is configured to obtain a numerical value of a data frame format; the first judging module 6 is used for judging whether the value of the data frame format is a third preset value; the fourth control module 7 is configured to, when the value of the data frame format is a third preset value, obtain a short-window current phasor transmitted by the opposite side and a current phasor of the local side to synthesize a differential current and a brake current, and complete a differential protection function by using short windows within a first preset time period; the fifth control module 8 is configured to switch to calculating a differential current and a braking current by using the opposite-side sampled data and the local-side sampled data after the first preset time period when the sampled data is always normal, so as to complete differential protection.
Fig. 6 is a schematic diagram of a third control module according to an embodiment of the present invention.
Specifically, referring to fig. 6, the third control module 4 includes: a setting unit 41 and a calculation unit 42. Wherein, the setting unit 41 is configured to set the number of sampling points in each sampling period to N; the calculating unit 42 is configured to calculate, for the short window data of the first preset time duration, real parts of the three-phase currents:
and, the imaginary part of the three-phase current is calculated as:
wherein x is l The l-th sampling point representing the input signal;
and the phasor sent to the opposite side was calculated as:
further, the line protection fibre channel transmission data processing device further comprises: a data checking module 10 and a setting module 11. The data checking module 10 is configured to check sampling data received through an optical fiber channel; the setting module 11 is configured to set the data frame format value to a first preset value when the CRC check is error-free, to set the data frame format value to a second preset value when the CRC check includes a single error, and to set the data frame format value to a third preset value when the CRC check includes two consecutive errors.
The line protection fiber channel transmission data processing device further comprises: a sixth control module 9 for locking the differential protection if the CRC check comprises three consecutive errors.
Accordingly, a third aspect of an embodiment of the present invention provides an electronic device, including: at least one processor; and a memory coupled to the at least one processor; the memory stores instructions executable by a processor, and the instructions are executed by the processor to enable at least one processor to execute the line protection fiber channel transmission data processing method.
In addition, a fourth aspect of the embodiments of the present invention further provides a computer-readable storage medium, on which computer instructions are stored, and when the instructions are executed by a processor, the method for processing line protection fibre channel transmission data is implemented.
The embodiment of the invention aims to protect a line protection optical fiber channel transmission data processing method and a device, wherein the method comprises the following steps: acquiring a numerical value of a data frame format in the opposite side communication message through a fiber channel; when the value of the data frame format is a first preset value, the devices on the two sides of the optical fiber channel send sampling data and switching value data at fixed time after each sampling is interrupted, and the sampling data on the current side and the received sampling data on the opposite side are utilized to synthesize differential current and braking current; when the numerical value of the data frame format is a second preset numerical value, transmitting the sampling data and the sampling sequence number of the abnormal check of the previous frame and the sampling data of the current frame to the opposite side through a plurality of preset first data bits of the sampling data, and synthesizing differential current and braking current for differential protection by using the sampling data of the current side and the opposite side by using devices on the two sides of the optical fiber channel; when the numerical value of the data frame format is a third preset numerical value, phasor calculation is carried out on the sampled data of 1/4 cycle before the abnormal frame to obtain a real part and an imaginary part of the three-phase current, the real part and the imaginary part of the three-phase current and corresponding sampling serial numbers are sent to the opposite side through a plurality of preset first data bits and a plurality of preset second data bits of the data, and the devices on the two sides of the optical fiber channel synthesize differential current and braking current for differential protection by utilizing the current phasors of the 1/4 cycle on the local side and the opposite side. The technical scheme has the following effects:
aiming at the condition that the differential protection is locked after the data of the optical fiber channel is abnormal, the sampling points are sent after each sampling is interrupted, and when the data is detected to be abnormal, the phasor is calculated by using a short window algorithm and is transmitted to the opposite side, so that the influence of the communication abnormality happened to the optical fiber channel on the differential protection is reduced.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (6)
1. A line protection fiber channel transmission data processing method is characterized by comprising the following steps:
acquiring a numerical value of a data frame format in the opposite-side communication message through the optical fiber channel;
when the value of the data frame format is a first preset value, the devices on the two sides of the optical fiber channel regularly send sampling data and switching value data after each sampling is interrupted, and the sampling data on the current side and the received sampling data on the opposite side are utilized to synthesize differential current and braking current;
when the value of the data frame format is a second preset value, sending the sampling data and the sampling serial number which are abnormal in the previous frame and the sampling data of the current frame to the opposite side through a plurality of preset first data bits of the sampling data, and synthesizing differential current and braking current for differential protection by the devices on the two sides of the optical fiber channel by utilizing the sampling data of the current side and the opposite side;
when the numerical value of the data frame format is a third preset numerical value, carrying out phasor calculation on the sampled data of 1/4 cycle before an abnormal frame to obtain a real part and an imaginary part of three-phase current, sending the real part and the imaginary part of the three-phase current and corresponding sampling serial numbers to the opposite side through a plurality of preset first data bits and a plurality of preset second data bits of the data, and synthesizing differential current and braking current for differential protection by using current phasors of the 1/4 cycle at the local side and the opposite side by using devices at the two sides of the optical fiber channel;
after the obtaining the value of the data frame format in the opposite-side communication message through the optical fiber channel, the method further includes:
acquiring a numerical value of the data frame format; judging whether the numerical value of the data frame format is the third preset numerical value or not; <xnotran> , , ; </xnotran> After the first preset time, when the sampling data is always normal, switching to calculating differential current and braking current by adopting the opposite side sampling data and the local side sampling data to complete differential protection;
the phasor calculation for the sampling data of 1/4 cycle before the abnormal frame includes:
setting the number of sampling points in each sampling period as N;
for the short window data with the first preset duration, the real part of the three-phase current is as follows:
and, the imaginary part of the three-phase current is:
wherein x is l The l-th sampling point representing the input signal;
then, the phasor calculation formula sent to the opposite side is:
2. the method as claimed in claim 1, wherein before obtaining the value of the data frame format in the opposite side sample data through the optical fiber channel, the method further comprises:
performing CRC on the sampling data received through the optical fiber channel;
when the CRC check is error-free, setting the data frame format value as the first preset value;
setting the data frame format value to the second preset value when the CRC check includes a single error;
and when the CRC check comprises two continuous errors, setting the data frame format value as the third preset value.
3. The line protection fibre channel transmission data processing method of claim 2, further comprising:
when the CRC check includes three consecutive errors, differential protection is blocked.
4. A line protection fibre channel transmission data processing apparatus, comprising:
a first obtaining module, configured to obtain, through the fibre channel, a value of a data frame format in a contralateral communication message;
the first control module is used for sending sampling data and switching value data at regular time after each sampling interruption by the devices on both sides of the optical fiber channel when the numerical value of the data frame format is a first preset numerical value, and synthesizing differential current and braking current by utilizing the sampling data on the current side and the sampling data on the opposite side;
the second control module is used for sending the sampling data and the sampling serial number which are abnormal in the previous frame and the sampling data of the current frame to the opposite side through a plurality of preset first data bits of the sampling data when the numerical value of the data frame format is a second preset numerical value, and the devices on the two sides of the optical fiber channel synthesize differential current and braking current for differential protection by using the sampling data of the current side and the sampling data of the opposite side;
the third control module is used for carrying out phasor calculation on the sampled data of 1/4 cycle before an abnormal frame when the numerical value of the data frame format is a third preset numerical value so as to obtain a real part and an imaginary part of three-phase current, sending the real part and the imaginary part of the three-phase current and corresponding sampling serial numbers to the opposite side through a plurality of preset first data bits and a plurality of preset second data bits of the data, and synthesizing differential current and brake current for differential protection by using current phasors of 1/4 cycle received by the local side and the opposite side by the devices on the two sides of the optical fiber channel;
further comprising:
a second obtaining module, configured to obtain a value of the data frame format;
the first judging module is used for judging whether the value of the data frame format is the third preset value or not;
a fourth control module, configured to, when the value of the data frame format is the third preset value, acquiring short window current phasor transmitted by the opposite side and current phasor of the current phasor to synthesize differential current and brake current, and completing a differential protection function by adopting short windows within a first preset time period;
the fifth control module is used for switching to the calculation of differential current and braking current by adopting the sampling data of the opposite side and the sampling data of the local side after the first preset time length when the sampling data is always normal so as to complete differential protection;
the third control module includes: a setting unit and a calculating unit;
the setting unit is used for setting the number of sampling points in each sampling period to be N;
the calculating unit is used for calculating the real part of the three-phase current for the short window data of a first preset time length:
and calculating the imaginary part of the three-phase current as:
wherein x is l Representing an input signalThe ith sample point of (1);
and calculating the phasor sent to the opposite side as:
5. the line protection fibre channel transmission data processing apparatus of claim 4, further comprising:
the data checking module is used for checking the sampling data received through the optical fiber channel;
a setting module, configured to set the data frame format value to the first preset value when a CRC check is error-free, further configured to set the data frame format value to the second preset value when the CRC check includes a single error, and further configured to set the data frame format value to the third preset value when the CRC check includes two consecutive errors.
6. The line protection fibre channel transmission data processing apparatus of claim 5, further comprising:
a sixth control module to block differential protection when the CRC check includes three consecutive errors.
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| CN113690859B (en) * | 2021-08-04 | 2023-02-21 | 国电南瑞科技股份有限公司 | Starting and acting method and system for power grid differential protection |
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