CN113889983B - Data transmission and protection system, method and storage device suitable for 5G differential protection - Google Patents
Data transmission and protection system, method and storage device suitable for 5G differential protection Download PDFInfo
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/28—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
- H02H3/30—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus using pilot wires or other signalling channel
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Abstract
The invention relates to a data transmission and protection system, a method and storage equipment suitable for 5G differential protection, wherein a differential protection hardware unit comprises a differential protection control module for completing voltage and current electrical information acquisition, logic operation and tripping and closing control of a circuit breaker of a node; the external precise time service module is used for completing time service of each end node of differential protection based on Beidou time service, GPS time service, 5G time service or multi-mode mixed application of the external precise time service systems; and the 5G communication module is used for completing data communication among the differential protection device modules at each end of the line based on the 5G communication network. According to the invention, under the condition of low sampling data transmission flow, the differential protection performance of the medium-voltage distribution network 5G meeting the application requirement can be realized, sampling point data is not transmitted in a normal operation state, only phasor data is transmitted once every cycle or every number of cycles for twice, the sampling point data is additionally transmitted in a fault state, and the wireless flow generated by differential protection is greatly reduced.
Description
Technical Field
The invention relates to the technical field of power system relay, in particular to a data transmission and protection system and method suitable for 5G differential protection and storage equipment.
Background
Compared with current protection and distance protection, the differential protection has the advantages of good selectivity, rapidness, sensitivity, simplicity, reliability and the like, so that the optical fiber differential protection in the high-voltage ultra-high voltage transmission line protection has become standard configuration. With the increasingly deepened landing of the carbon-to-carbon peak neutralization global development strategy, the power distribution network is forming a high-permeability active power distribution network situation of distributed power Sources (DGs) mainly comprising photovoltaic and wind power, wherein the DG permeability is rapidly and greatly improved, and the multi-power sources are operated in a closed loop. In order to cope with the development of high-permeability active power distribution networks and improve the power supply reliability of urban power distribution networks, the necessity of adopting differential protection in medium-voltage power distribution networks is more prominent. With the large-scale mature application of the 5G wireless communication technology with high reliability and ultra-low time delay, the adoption of the medium-voltage distribution network line differential protection based on the 5G wireless communication in the uncovered area of the optical fiber communication is becoming a technical trend.
The current intelligent substation line optical fiber longitudinal differential protection device generally adopts 80-point sampling per cycle, if each differential protection sends sampling point data and phasor data to other nodes of the differential protection according to each sampling point, each frame transmission is calculated according to 100 bytes, and the data sending flow of each month of a single node is as follows: 100 bytes x 80 dots x 50Hz x 60 seconds x 60 minutes x 24 hours x 30 days > 1TB. In the prior art, the differential protection of the high-voltage line of the power system adopts optical fibers to realize data transmission without considering the problem of communication flow, and compared with the optical fiber communication, the differential protection based on 5G communication has the important obstacle that the popularization and the application of the differential protection are limited because the excessively high wireless communication flow consumption and the flow cost are caused by the over-high wireless communication flow consumption, so that the research on realizing the 5G differential protection by using lower flow consumption through an effective data transmission method is an important proposition for popularizing and applying the 5G differential protection.
Disclosure of Invention
The data transmission and protection system, the method and the storage device suitable for 5G differential protection can realize the 5G differential protection performance of the medium-voltage distribution network meeting the application requirements under the condition of lower sampling data transmission flow.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the data transmission and protection system suitable for 5G differential protection is based on a differential protection hardware unit, wherein the differential protection hardware unit comprises a differential protection control module, a 5G communication module and an external accurate time service module, and the 5G communication module and the external accurate time service module are respectively connected with interfaces corresponding to the differential protection control module;
each end node of differential protection is provided with a set of differential protection hardware unit, or each end node is provided with two sets of differential protection hardware units to form a dual differential protection system;
wherein,
the differential protection control module is used for completing voltage and current electrical information acquisition, logic operation and tripping and closing control of the circuit breaker of the node;
the external precise time service module is used for completing time service of each end node of differential protection based on Beidou time service, GPS time service, 5G time service or multi-mode mixed application of the external precise time service systems;
and the 5G communication module is used for completing data communication among the differential protection device modules at each end of the line based on the 5G communication network.
Further, each node 5G communicates, according to the running state, to send analog phasor data or sampling point data messages to other nodes of the differential protection 1 time per cycle or 1 time per sampling interval, where the effective data information of the messages includes: the method comprises the steps of a main node mark, a node number, an external time service mark, a node system frequency, a sampling synchronization mark, a first sampling point of phasor data or a sampling sequence number and a sampling point time label of the sampling point of the sampling data, three-phase voltage data, three-phase current data, switching value and logic control information.
On the other hand, the invention also discloses a data transmission and protection method suitable for 5G differential protection, a differential protection control module based on the system comprises the following steps,
after all node devices are operated, synchronous control of sampling is realized and continuously maintained according to sampling points X for weekly wave differential protection, and X is 16, 20 or 24;
during normal operation, each node device transmits the synchronous phasor data of the node to other nodes of the differential protection according to 1 time per cycle or 1 time per several cycles, and the sampling point data is not transmitted; and the interval period number of the synchronous phasor data transmission is controlled according to the amplitude value or the angle stability of the node phasor data. All differential protection devices set amplitude stability threshold values V1, V2 and V3 according to the percentage of the rated value of the analog quantity, set angle stability threshold values D1, D2 and D3 according to the angle difference, and send 1 time per cycle wave if the amplitude change exceeds V3 or the angle change exceeds D3 by taking the phasor data sent last time as a reference; otherwise, if the amplitude change exceeds V2 or the angle change exceeds D2, 1 time is transmitted every two cycles; otherwise, if the amplitude change exceeds V1 or the angle change exceeds D1, 1 time is transmitted every five cycles; otherwise, if the amplitude variation is within the V1 range and the angle variation is within the D1 range, the transmission is carried out 1 time every ten cycles. Amplitude stability thresholds V1, V2, V3 may be selected with reference to 1%, 2%, 5%, and angle stability thresholds D1, D2, D3 may be selected with reference to 1 °, 2 °, 5 °;
when the node is in normal operation, all nodes keep carrying out 1-time phase difference protection data operation and logic judgment on each cycle, but when a certain node transmits 1-time synchronous phasor data according to a plurality of cycles at intervals, after waiting for reasonable communication delay time, other node phasor data which is not received by the node in the cycle is synchronously filled with the recently received node phasor data according to the whole cycle time sequence, but at the moment, differential protection is not in instantaneous operation, but is set to be operation time according to the node (the latest phasor data transmission interval number is +2 cycles), and an outlet is opened only when the differential protection operation condition is continuously met in the operation time.
Further, the method comprises the following steps that when a high-voltage line fails, each node can sense that the voltage and the current at the installation position of the node change suddenly, and once the node detects that the voltage or the current changes suddenly and the continuous multiple points meet the following formula, a starting mark of the sudden variable of the node is set;
or (b)
After the abrupt variable of the node is started, sampling data of the node is actively transmitted to other nodes of the differential protection according to the sampling point number X for differential protection of each cycle from the first abrupt point, the sampling data comprises an abrupt variable starting mark of the node, and meanwhile, phasor data of the node is transmitted to the other nodes of the differential protection according to 1 time of each cycle; after 1 week from the first mutation point, adding and transmitting 1 time of mutation cycle phasor data of the node taking the first mutation point as a starting point for calculating the phasor, and transmitting the mutation cycle phasor data to other nodes of the differential protection; the second and subsequent cycles after the abrupt quantity is started do not additionally transmit abrupt cycle phasor data;
after any node of the differential protection receives the initial setting of the mutation starting marks of other nodes and the sampling point data for the differential protection, if the node does not set the mutation starting marks, the node mutation starting marks are set, the sampling data of the node is actively sent to other nodes of the differential protection according to the sampling point number X for the differential protection of each cycle from the first mutation point of the device of the mutation node, and meanwhile, the phasor data of the node is sent to other nodes of the differential protection according to 1 time of each cycle.
Further, the method comprises the following steps that when the node receives sampling point data of other nodes with differential protection for 1/4 period, a rapid sampling point differential protection algorithm is started, 1 sampling point differential protection data operation and logic judgment are carried out on each sampling point, and 1 phase difference differential protection data operation and logic judgment are carried out on each cycle; the sampling point differential protection and the phasor differential protection run in parallel, and the node switch is tripped by the instantaneous action after any differential protection action condition is met.
Further, after the abrupt change starting flag of the node is set, if the differential protection is continuously judged in the Y cycles and the operation condition is not met all the time, the state of the abrupt change starting flag of the node is canceled, the sampling data of the node is not transmitted according to the sampling point number X for differential protection of each cycle, the phasor data of the node is transmitted to other nodes of the differential protection only 1 time per cycle or 1 time per cycle, each differential protection node carries out 1-time differential protection data operation and logic judgment per cycle, and Y is an integer between 2 and 8.
Further, the normal operation phasor data frame and the abrupt cycle phasor data frame have the same format, and the data information carried by the phasor data frame message includes: the system comprises a phasor data frame mark, a main node mark, a local node number, an external time service mark, local node system frequency, a sampling synchronous mark, a sampling sequence number of a first sampling point of local phasor data, a sampling time label of the first sampling point of the local phasor data, three-phase voltage phasor data, three-phase current phasor data, switching value and logic control information, wherein the logic control information comprises a local node abrupt variable starting mark, a phasor differential protection action mark and a sampling point differential protection action mark;
the data information carried by the sampling point data frame message comprises: the system comprises a sampling point data frame mark, a main node mark, a local node number, an external time service mark, local node system frequency, a sampling synchronous mark, a sampling sequence number of a local sampling point, a sampling time label of the local sampling point, three-phase voltage sampling point data, three-phase current sampling point data, switching value and logic control information, wherein the logic control information comprises a local node abrupt variable starting mark, a phasor differential protection action mark and a sampling point differential protection action mark;
further, the method also comprises the steps of,
all phasor data frames and sampling point data frames are repeatedly sent for 2 times, so that the correct data frames can be still ensured to be received in time when accidental error codes are generated in wireless communication;
the differential protection action node actively transmits phasor differential protection action data frames or sampling point differential protection action data frames to other nodes after the node differential protection spontaneously acts;
the data information carried by the phasor differential protection action data frame message comprises: the method comprises the steps of a phasor differential protection action data frame mark, a main node mark, a node number, an external time service mark, a sampling sequence number of a first sampling point of phasor data for calculating the phasor differential protection action, a sampling time label of the first sampling point, three-phase voltage phasor data, three-phase current phasor data, switching value and logic control information;
the data information carried by the sampling point differential protection action data frame message comprises: the sampling point differential protection action data frame mark, the main node mark, the node number, the external time service mark, the node system frequency, the sampling synchronous mark, the sampling sequence number of the last sampling point for sampling point differential protection action calculation, the sampling time label, the three-phase voltage sampling point data, the three-phase current sampling point data, the switching value and the logic control information.
If the differential protection is not operated, the other differential protection nodes compare the received differential protection operation data frame message with the cache information of the node to judge the consistency of the information, and if the information is completely consistent, the differential protection operation mark of the node is set and the trip outlet of the node is controlled, but the differential protection operation data frame is not transmitted because the differential protection spontaneous operation of the node is not performed.
In yet another aspect, the invention also discloses an embedded computer readable storage medium storing an embedded computer program, which when executed by a processor causes the processor to perform the steps of the method as described above.
In yet another aspect, the invention also discloses an embedded computer device comprising a memory and a processor, the memory storing an embedded computer program which, when executed by the processor, causes the processor to perform the steps of the method as described above.
According to the technical scheme, the data transmission and protection system and method suitable for 5G differential protection have the following beneficial effects:
1. in a normal running state, no sampling point data is sent, but the phasor data is sent once every cycle or twice every number of cycles, and the wireless flow generated by differential protection is greatly reduced.
The method comprises the steps of sending 1-time phasor data every ten cycles, calculating and sending twice every frame of 50 bytes, and sending the flow of each month of a single node: 50 bytes×2 times×50hz× (1/10 interval period number) ×60 seconds×60 minutes×24 hours×30 days=1.296 GB, which is only less than 2% of the flow of one transmission pass according to the optical fiber longitudinal differential protection 80 points/cycle sampling points and phasor data of the intelligent substation.
2. By repeatedly sending a small amount of data, the adverse effect of the formation of the accidental error code of the wireless communication is greatly reduced under the condition of controllable overall flow, the correct transmission and reception of the differential protection data at the fault moment can be ensured, and the rapid action of differential protection can be ensured without complex algorithms such as interpolation and the like.
3. When serious faults occur, as each node can start in a mutation quantity and send differential protection full sampling point data, faults can be quickly identified according to a sampling point quick differential protection algorithm, and a differential protection action tripping outlet can be realized at the highest speed when 5-8 sampling point data are received, so that the time of the differential protection action is increased by tens of milliseconds compared with that of the phasor differential protection action.
4. For lighter faults, if voltage and current mutation occurs in a middle sampling point of normal phasor calculation and an extreme case occurs, sampling point data still loses points, so that sampling point differential motion cannot accurately act, an additional mutation cycle phasor data frame can play a role in compensation again, and the differential protection can rapidly trip only one cycle of data after the faults are acquired, and compared with the normal phasor differential data frame waiting for tripping, the action time is averagely improved by 10 ms. That is, when the fault is light and the sampling point is lost, the differential protection fast action characteristic can be realized without complex interpolation operation.
5. When a slight fault occurs, if the abrupt quantity cannot be started, the sensitivity and selectivity advantages of the differential protection and the quick action tripping can be exerted through the phasor differential protection of 20ms once per week wave.
6. The differential protection operation data frame is sent through the differential protection spontaneous operation node to realize the 'remote safe trip' effect of the differential protection non-operation node, especially the data invasion false trip risk of a single 'remote trip' signal is greatly reduced by carrying out information consistency comparison on the historical cache data contained in the differential protection operation data frame.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a flow chart of the method of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention.
As shown in fig. 1, the data transmission and protection system suitable for 5G differential protection according to the present embodiment is based on a differential protection hardware unit for implementing differential protection, where the hardware unit includes a differential protection control module, a 5G communication module, and an external precise timing module;
each end node of the differential protection control module is provided with one set of hardware device, or each end node is provided with two sets of hardware devices to form a double differential protection system;
the differential protection control module is used for completing voltage and current electrical information acquisition, logic operation and breaker tripping and closing control of the node where the differential protection control module is located and is provided with necessary 5G communication, external accurate time service and operation maintenance interfaces.
And the external precise time service module is used for completing time service of each end node of differential protection based on external precise time service systems such as Beidou time service, GPS time service, 5G time service or multi-mode hybrid application.
And the 5G communication module is used for completing data communication among the differential protection device modules at each end of the line based on the 5G communication network. Each node 5G communication transmits analog phasor data or sampling point data messages to other nodes of the differential protection according to the running state for 1 time per cycle or 1 time per number of cycles or 1 time per sampling interval, and the effective data information of the messages comprises: the method comprises the steps of a main node mark, a node number, an external time service mark, a node system frequency, a sampling synchronization mark, a first sampling point of phasor data or a sampling sequence number and a sampling point time label of the sampling point of the sampling data, three-phase voltage data, three-phase current data, switching value and logic control information.
As shown in fig. 2, a specific protection method of the differential protection control module is as follows:
1. after all the node devices are operated, synchronous control of sampling is realized and continuously maintained according to the sampling point number X for differential protection per cycle. (X is generally 16 or 20 or 24)
2. In normal operation, each node device transmits the synchronous phasor data of the node to other nodes of the differential protection 1 time per cycle or 1 time per several cycles, and the sampling point data is not transmitted. And the interval period number of the synchronous phasor data transmission is controlled according to the amplitude value or the angle stability of the node phasor data. All differential protection devices set amplitude stability threshold values V1, V2 and V3 according to the percentage of the rated value of the analog quantity, set angle stability threshold values D1, D2 and D3 according to the angle difference, and send 1 time per cycle wave if the amplitude change exceeds V3 or the angle change exceeds D3 by taking the phasor data sent last time as a reference; otherwise, if the amplitude change exceeds V2 or the angle change exceeds D2, 1 time is transmitted every two cycles; otherwise, if the amplitude change exceeds V1 or the angle change exceeds D1, 1 time is transmitted every five cycles; otherwise, if the amplitude variation is within the V1 range and the angle variation is within the D1 range, the transmission is carried out 1 time every ten cycles. The amplitude stability threshold V1, V2, V3 may be selected with reference to 1%, 2%, 5%, and the angle stability threshold D1, D2, D3 may be selected with reference to 1 °, 2 °, 5 °.
When the node is in normal operation, all nodes keep carrying out 1-time phase difference protection data operation and logic judgment on each cycle, but when a certain node transmits 1-time synchronous phasor data according to a plurality of cycles at intervals, after waiting for reasonable communication delay time, other node phasor data which is not received by the node in the cycle is synchronously filled with the recently received node phasor data according to the whole cycle time sequence, but at the moment, differential protection is not in instantaneous operation, but is set to be operation time according to the node (the latest phasor data transmission interval number is +2 cycles), and an outlet is opened only when the differential protection operation condition is continuously met in the operation time.
3. When the high-voltage line has serious faults, each node can sense the abrupt change of voltage and current at the installation position of the node, and once the node detects the abrupt change of voltage or current and the continuous multiple points meet the following formula, the abrupt change starting mark of the node is set.
Or (b)
After the mutation quantity of the node is started, the sampling data of the node is actively sent to other nodes of the differential protection according to the sampling point number X for differential protection of each cycle from the first mutation point, the sampling data comprises a mutation quantity starting mark of the node, and meanwhile, the phasor data of the node is sent to the other nodes of the differential protection according to 1 time of each cycle. After 1 week from the first mutation point, the mutation cycle phasor data of the node, which takes the first mutation point as a starting point for calculating the phasor, is additionally sent for 1 time, and then the mutation cycle phasor data is sent to other nodes of the differential protection. The second and subsequent cycles after the abrupt change is started do not additionally transmit abrupt cycle phasor data.
4. After any node of the differential protection receives the initial setting of the mutation starting marks of other nodes and the sampling point data for the differential protection, if the node does not set the mutation starting marks, the node mutation starting marks are set, the sampling data of the node is actively sent to other nodes of the differential protection according to the sampling point number X for the differential protection of each cycle from the first mutation point of the device of the mutation node, and meanwhile, the phasor data of the node is sent to other nodes of the differential protection according to 1 time per cycle.
5. When the node receives the sampling point data of other nodes with differential protection for 1/4 period, a rapid sampling point differential protection algorithm is started, 1 sampling point differential protection data operation and logic judgment are carried out on each sampling point, and 1 phase difference differential protection data operation and logic judgment are carried out on each cycle. The sampling point differential protection and the phasor differential protection run in parallel, and the node switch is tripped by the instantaneous action after any differential protection action condition is met.
6. After the abrupt change starting mark of the node is set, if the differential protection is continuously judged in Y cycles and does not meet the action condition all the time, the set state of the abrupt change starting mark of the node is canceled, the sampling data of the node is not sent according to the number X of sampling points for differential protection of each cycle, the phasor data of the node is sent to other nodes of the differential protection only 1 time per cycle or 1 time per cycle, and each differential protection node carries out 1-time differential phase difference protection data operation and logic judgment per cycle. (Y is generally an integer of 2 to 8)
7. The normal operation phasor data frame and the abrupt cycle phasor data frame have the same format, and the data information carried by the message comprises: the phase data frame mark, the main node mark, the node number, the external time service mark, the node system frequency, the sampling synchronization mark, the sampling serial number of the first sampling point of the phase data and the sampling time label thereof, the three-phase voltage phase data, the three-phase current phase data, the switching value and the logic control information, wherein the logic control information comprises the node abrupt variable starting mark, the phase differential protection action mark, the sampling point differential protection action mark and the like.
8. The data information carried by the sampling point data frame message comprises: the system comprises a sampling point data frame mark, a main node mark, a local node number, an external time service mark, local node system frequency, a sampling synchronous mark, a sampling sequence number of a local sampling point, a sampling time label of the local sampling point, three-phase voltage sampling point data, three-phase current sampling point data, switching value and logic control information, wherein the logic control information comprises a local node abrupt variable starting mark, a phasor differential protection action mark, a sampling point differential protection action mark and the like.
9. Considering that the error code problem possibly existing in the 5G wireless communication causes the receiving failure of individual data, all phasor data frames and sampling point data frames in the scheme can be repeatedly transmitted for 2 times, so that the correct data frames can be still ensured to be received in time when the wireless communication is in accidental error code.
10. In theory, since the data used for differential protection by all the differential protection nodes are the same, each node differential protection should have the same action behavior, but in order to prevent the differential protection of each node from being unable to act simultaneously due to the unexpected situations such as slight fault calculation error of action boundary or communication influence, the differential protection action node actively transmits phasor differential protection action data frames or sampling point differential protection action data frames to other nodes after the differential protection of the node spontaneously acts.
The data information carried by the phasor differential protection action data frame message comprises: the method comprises the steps of a phasor differential protection action data frame mark, a main node mark, a node number, an external time service mark, a sampling sequence number of a first sampling point of phasor data for calculating the phasor differential protection action, a sampling time label, three-phase voltage phasor data, three-phase current phasor data, switching value and logic control information.
The data information carried by the sampling point differential protection action data frame message comprises: the sampling point differential protection action data frame mark, the main node mark, the node number, the external time service mark, the node system frequency, the sampling synchronous mark, the sampling sequence number of the last sampling point for sampling point differential protection action calculation, the sampling time label, the three-phase voltage sampling point data, the three-phase current sampling point data, the switching value and the logic control information.
If the differential protection is not operated, the other differential protection nodes compare the received differential protection operation data frame message with the cache information of the node to judge the consistency of the information, and if the information is completely consistent, the differential protection operation mark of the node is set and the trip outlet of the node is controlled, but the differential protection operation data frame is not transmitted because the differential protection spontaneous operation of the node is not performed.
The beneficial effects of the invention are as follows:
1. in a normal running state, no sampling point data is sent, but the phasor data is sent once every cycle or twice every number of cycles, and the wireless flow generated by differential protection is greatly reduced.
The method comprises the steps of sending 1-time phasor data every ten cycles, calculating and sending twice every frame of 50 bytes, and sending the flow of each month of a single node: 50 bytes×2 times×50hz× (1/10 interval period number) ×60 seconds×60 minutes×24 hours×30 days=1.296 GB, which is only less than 2 thousandths of the flow rate of only transmitting 80 points/cycle sampling points and phasor data according to the optical fiber longitudinal difference protection of the intelligent substation.
2. By repeatedly sending a small amount of data, the adverse effect of the formation of the accidental error code of the wireless communication is greatly reduced under the condition of controllable overall flow, the correct transmission and reception of the differential protection data at the fault moment can be ensured, and the rapid action of differential protection can be ensured without complex algorithms such as interpolation and the like.
3. When serious faults occur, as each node can start in a mutation quantity and send differential protection full sampling point data, faults can be quickly identified according to a sampling point quick differential protection algorithm, and a differential protection action tripping outlet can be realized at the highest speed when 5-8 sampling point data are received, so that the time of the differential protection action is increased by tens of milliseconds compared with that of the phasor differential protection action.
4. For lighter faults, if voltage and current mutation occurs in a middle sampling point of normal phasor calculation and an extreme case occurs, sampling point data still loses points, so that sampling point differential motion cannot accurately act, an additional mutation cycle phasor data frame can play a role in compensation again, and the differential protection can rapidly trip only one cycle of data after the faults are acquired, and compared with the normal phasor differential data frame waiting for tripping, the action time is averagely improved by 10 ms. That is, when the fault is light and the sampling point is lost, the differential protection fast action characteristic can be realized without complex interpolation operation.
5. When a slight fault occurs, if the abrupt quantity cannot be started, the sensitivity and selectivity advantages of the differential protection and the quick action tripping can be exerted through the phasor differential protection of 20ms once per week wave.
6. The differential protection operation data frame is sent through the differential protection spontaneous operation node to realize the 'remote safe trip' effect of the differential protection non-operation node, especially the data invasion false trip risk of a single 'remote trip' signal is greatly reduced by carrying out information consistency comparison on the historical cache data contained in the differential protection operation data frame.
In yet another aspect, the invention also discloses an embedded computer readable storage medium storing an embedded computer program, which when executed by a processor causes the processor to perform the steps of the method as described above.
In yet another aspect, the invention also discloses an embedded computer device comprising a memory and a processor, the memory storing an embedded computer program which, when executed by the processor, causes the processor to perform the steps of the method as described above.
It may be understood that the system provided by the embodiment of the present invention corresponds to the method provided by the embodiment of the present invention, and explanation, examples and beneficial effects of the related content may refer to corresponding parts in the above method.
It will be appreciated by those skilled in the art that 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a data transmission and protection method suitable for 5G differential protection, based on differential protection control module, its characterized in that: comprises the steps of,
after all node devices are operated, synchronous control of sampling is realized and continuously maintained according to sampling points X for weekly wave differential protection, and X is 16, 20 or 24;
during normal operation, each node device transmits the synchronous phasor data of the node to other nodes of the differential protection for 1 time per cycle or 1 time per number of cycles, and the sampling point data is not transmitted every time of transmission for two times;
the interval period number of the synchronous phasor data transmission is controlled according to the amplitude value or the angle stability of the node phasor data;
all differential protection devices set amplitude stability threshold values V1, V2 and V3 according to the percentage of the rated value of the analog quantity, set angle stability threshold values D1, D2 and D3 according to the angle difference, and send 1 time per cycle wave if the amplitude change exceeds V3 or the angle change exceeds D3 by taking the phasor data sent last time as a reference; otherwise, if the amplitude change exceeds V2 or the angle change exceeds D2, 1 time is transmitted every two cycles; otherwise, if the amplitude change exceeds V1 or the angle change exceeds D1, 1 time is transmitted every five cycles; otherwise, if the amplitude change is within the V1 range and the angle change is within the D1 range, transmitting 1 time every ten cycles; amplitude stability thresholds V1, V2 and V3 are selected at 1%, 2% and 5%, and angle stability thresholds D1, D2 and D3 are selected at 1 degree, 2 degrees and 5 degrees;
when the node is in normal operation, all nodes keep carrying out 1-time phase difference protection data operation and logic judgment on each cycle, but when a certain node transmits 1-time synchronous phasor data according to a plurality of cycles at intervals, after waiting for reasonable communication delay time, other node phasor data which is not received by the node in the cycle is synchronously filled with the recently received node phasor data according to the whole cycle time sequence, but at the moment, the differential protection is not in instantaneous action, but is set as action time according to the node, namely the latest phasor data transmission interval cycle number +2, and an outlet is in action until the action time continuously meets the differential protection action condition.
2. A data transmission and protection method for 5G differential protection according to claim 1, wherein: when the high-voltage line fails, each node can sense the voltage and current abrupt change at the installation position of the node, and once the node detects the voltage or current abrupt change and the continuous multiple points meet the following formula, the node abrupt change starting mark is set;
or (b)
After the abrupt variable of the node is started, sampling data of the node is actively transmitted to other nodes of the differential protection according to the sampling point number X for differential protection of each cycle from the first abrupt point, the sampling data comprises an abrupt variable starting mark of the node, and meanwhile, phasor data of the node is transmitted to the other nodes of the differential protection according to 1 time of each cycle; after 1 week from the first mutation point, adding and transmitting 1 time of mutation cycle phasor data of the node taking the first mutation point as a starting point for calculating the phasor, and transmitting the mutation cycle phasor data to other nodes of the differential protection; the second and subsequent cycles after the abrupt quantity is started do not additionally transmit abrupt cycle phasor data;
after any node of the differential protection receives the initial setting of the mutation starting marks of other nodes and the sampling point data for the differential protection, if the node does not set the mutation starting marks, the node mutation starting marks are set, the sampling data of the node is actively sent to other nodes of the differential protection according to the sampling point number X for the differential protection of each cycle from the first mutation point of the device of the mutation node, and meanwhile, the phasor data of the node is sent to other nodes of the differential protection according to 1 time of each cycle.
3. A data transmission and protection method for 5G differential protection according to claim 1, wherein: the method comprises the following steps that when the node receives sampling point data of other nodes with differential protection for 1/4 period, a rapid sampling point differential protection algorithm is started, 1 sampling point differential protection data operation and logic judgment are carried out on each sampling point, and 1 phase difference differential protection data operation and logic judgment are carried out on each cycle; the sampling point differential protection and the phasor differential protection run in parallel, and the node switch is tripped by the instantaneous action after any differential protection action condition is met.
4. A data transmission and protection method for 5G differential protection according to claim 1, wherein: and after the mutation starting mark of the node is set, if the differential protection is continuously judged in Y cycles and the action condition is not met all the time, canceling the set state of the mutation starting mark of the node, and sending the phase data of the node to other nodes of the differential protection only 1 time per cycle or 1 time per number of cycles without sending the sampling data of the node according to the sampling point number X for the differential protection of each cycle, wherein each differential protection node carries out 1-time phase difference protection data operation and logic judgment per cycle, and Y is an integer between 2 and 8.
5. A data transmission and protection method for 5G differential protection according to claim 1, wherein: the normal operation phasor data frame and the abrupt cycle phasor data frame have the same format, and the data information carried by the phasor data frame message comprises: the system comprises a phasor data frame mark, a main node mark, a local node number, an external time service mark, local node system frequency, a sampling synchronous mark, a sampling sequence number of a first sampling point of local phasor data, a sampling time label of the first sampling point of the local phasor data, three-phase voltage phasor data, three-phase current phasor data, switching value and logic control information, wherein the logic control information comprises a local node abrupt variable starting mark, a phasor differential protection action mark and a sampling point differential protection action mark;
the data information carried by the sampling point data frame message comprises: the system comprises a sampling point data frame mark, a main node mark, a local node number, an external time service mark, local node system frequency, a sampling synchronous mark, a sampling sequence number of a local sampling point, a sampling time label of the local sampling point, three-phase voltage sampling point data, three-phase current sampling point data, switching value and logic control information, wherein the logic control information comprises a local node abrupt variable starting mark, a phasor differential protection action mark and a sampling point differential protection action mark.
6. A method of data transmission and protection for 5G differential protection according to any of claims 1-5, wherein: also included is a method of manufacturing a semiconductor device,
all phasor data frames and sampling point data frames are repeatedly sent for 2 times, so that the correct data frames can be still ensured to be received in time when accidental error codes are generated in wireless communication;
the differential protection action node actively transmits phasor differential protection action data frames or sampling point differential protection action data frames to other nodes after the node differential protection spontaneously acts;
the data information carried by the phasor differential protection action data frame message comprises: the method comprises the steps of a phasor differential protection action data frame mark, a main node mark, a node number, an external time service mark, a sampling sequence number of a first sampling point of phasor data for calculating the phasor differential protection action, a sampling time label of the first sampling point, three-phase voltage phasor data, three-phase current phasor data, switching value and logic control information;
the data information carried by the sampling point differential protection action data frame message comprises: the sampling point differential protection action data frame mark, the main node mark, the node number, the external time service mark, the node system frequency, the sampling synchronous mark, the sampling sequence number of the last sampling point for sampling point differential protection action calculation, the sampling time label, the three-phase voltage sampling point data, the three-phase current sampling point data, the switching value and the logic control information;
if the differential protection is not operated, the other differential protection nodes compare the received phasor differential protection operation data frame message or sampling point differential protection operation data frame message with the cache information of the node to judge the consistency of the information, and if the information is completely consistent, the differential protection operation mark of the node is set and the tripping outlet of the node is controlled, but the differential protection operation data frame is not transmitted because the differential protection spontaneous operation of the node is not performed.
7. A low-traffic data transmission and protection system suitable for 5G differential protection, configured to implement the data transmission and protection method suitable for 5G differential protection according to any one of claims 1 to 6, where the differential protection hardware unit includes a differential protection control module, a 5G communication module, and an external precise time service module, where the 5G communication module and the external precise time service module are connected to interfaces corresponding to the differential protection control module, respectively;
the method is characterized in that:
each end node of differential protection is provided with a set of differential protection hardware unit, or each end node is provided with two sets of differential protection hardware units to form a dual differential protection system;
wherein,
the differential protection control module is used for completing voltage and current electrical information acquisition, logic operation and tripping and closing control of the circuit breaker of the node;
the external precise time service module is used for completing time service of each end node of differential protection based on Beidou time service, GPS time service, 5G time service or multi-mode mixed application of the external precise time service systems;
and the 5G communication module is used for completing data communication among the differential protection device modules at each end of the line based on the 5G communication network.
8. The low-traffic data transmission and protection system suitable for 5G differential protection of claim 7, wherein: each node 5G communication transmits analog phasor data or sampling point data messages to other nodes of the differential protection according to the running state for 1 time per cycle or 1 time per number of cycles or 1 time per sampling interval, and the effective data information of the messages comprises: the method comprises the steps of a main node mark, a node number, an external time service mark, a node system frequency, a sampling synchronization mark, a first sampling point of phasor data or a sampling sequence number and a sampling point time label of the sampling point of the sampling data, three-phase voltage data, three-phase current data, switching value and logic control information.
9. An embedded computer readable storage medium storing an embedded computer program, which when executed by a processor causes the processor to perform the steps of the method according to any one of claims 1 to 6.
10. An embedded computer device comprising a memory and a processor, the memory storing an embedded computer program which, when executed by the processor, causes the processor to perform the steps of the method of any one of claims 1 to 6.
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