CN113889983A - Data transmission and protection system and method applicable to 5G differential protection and storage device - Google Patents
Data transmission and protection system and method applicable to 5G differential protection and storage device Download PDFInfo
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- 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 data transmission and protection method and a storage device suitable for 5G differential protection.A differential protection hardware unit comprises a differential protection control module, and is used for completing voltage and current electrical information acquisition, logic operation and circuit breaker tripping and closing control of a node; the external accurate time service module is used for completing time service of differentially protecting each end node based on Beidou time service, GPS time service, 5G time service or multi-mode mixed application of the external accurate time service systems; and the 5G communication module is used for finishing data communication between the modules of the differential protection device at each end of the line based on a 5G communication network. The invention can realize the 5G differential protection performance of the medium-voltage distribution network meeting the application requirement under the condition of lower sampling data transmission flow, does not send sampling point data under the normal operation state, only sends phasor data once per cycle or every few cycles and twice per time, increases the sending sampling point data under the fault state, and greatly reduces the wireless flow generated by differential protection.
Description
Technical Field
The invention relates to the technical field of power system relays, in particular to a data transmission and protection system and method applicable to 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 protection of the high-voltage ultrahigh-voltage transmission line becomes standard configuration. With the increasingly deepened landing of the global development strategy of carbon peak-to-peak carbon neutralization, the distribution network forms a high-permeability active distribution network situation that a Distributed Generation (DG) mainly comprising photovoltaic power and wind power is accessed at multiple points, the DG permeability is rapidly and greatly improved, and multiple power supplies are operated in a loop closing mode. In order to deal 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 increasingly prominent. With the mature application of the 5G wireless communication technology with high reliability and ultra-low time delay in a large scale, the adoption of the differential protection of the medium-voltage distribution network circuit based on the 5G wireless communication is becoming a technical trend in the area uncovered by the optical fiber communication.
The current intelligent substation circuit optic fibre longitudinal differential protection device generally adopts 80 sampling of every cycle, if every differential protection all sends sampling point data and phasor data to other nodes of differential protection according to every sampling point, every frame transmission is calculated according to 100 bytes, the data transmission flow of single node every month does: 100 bytes × 80 dots × 50Hz × 60 seconds × 60 minutes × 24 hours × 30 days > 1 TB. 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 optical fiber communication, the differential protection based on 5G communication has the important obstacles of limiting the popularization and the application of the differential protection, namely overhigh wireless communication flow consumption and flow cost, 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, method and storage device suitable for 5G differential protection provided by the invention can realize the 5G differential protection performance of a medium-voltage distribution network meeting the application requirement under the condition of lower sampling data transmission flow.
In order to achieve the purpose, the invention adopts the following technical scheme:
a 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 precise time service module, and the 5G communication module and the external precise time service module are respectively connected with corresponding interfaces of the differential protection control module;
each end node is subjected to differential protection and is provided with one 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 content of the first and second substances,
the differential protection control module is used for completing voltage and current electrical information acquisition, logic operation and tripping and closing control of a circuit breaker at the node;
the external accurate time service module is used for completing time service of differentially protecting each end node based on Beidou time service, GPS time service, 5G time service or multi-mode mixed application of the external accurate time service systems;
and the 5G communication module is used for finishing data communication between the modules of the differential protection device at each end of the line based on a 5G communication network.
Further, each node 5G communicates to send analog phasor data or sampling point data messages to other nodes of the differential protection according to the running state 1 time per cycle or 1 time per several cycles or 1 time per sampling interval, and the effective data information of the messages includes: the system comprises a main node mark, a local node number, an external time service mark, a local node system frequency, a sampling synchronization mark, a first sampling point of phasor data or a sampling sequence number and a sampling point time tag of the sampling point of the sampling data, three-phase voltage data, three-phase current data, a 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, and the differential protection control module based on the system comprises the following steps,
after all node devices operate, the synchronous control of sampling is realized and continuously maintained according to the sampling point number X for the weekly wave differential protection, wherein X is 16, 20 or 24;
when the device normally operates, each node device sends the synchronous phasor data of the node to other nodes of differential protection according to 1 time per cycle or 1 time per several cycles, and the sampling point data is not sent; and controlling the interval frequency of sending the synchronous phasor data according to the amplitude or the angle stability of the phasor data of the node. All differential protection devices uniformly set amplitude stability threshold values V1, V2 and V3 according to percentage numbers of rated values of analog quantities, uniformly set angle stability threshold values D1, D2 and D3 according to angle differences, transmit phasor data for the previous time as a reference, and transmit for 1 time every cycle if amplitude change exceeds V3 or angle change exceeds D3; otherwise, if the amplitude change exceeds V2 or the angle change exceeds D2, the signal is transmitted for 1 time every two cycles; otherwise, if the amplitude change exceeds V1 or the angle change exceeds D1, the signal is sent for 1 time every five cycles; otherwise if the amplitude variation is within the range of V1 and the angle variation is within the range of D1, then transmit 1 time every ten cycles. The amplitude stability thresholds V1, V2 and V3 can be selected by referring to 1%, 2% and 5%, and the angle stability thresholds D1, D2 and D3 can be selected by referring to 1 °, 2 ° and 5 °;
when the node normally operates, all nodes keep each cycle to carry out 1 time of phasor differential protection data operation and logic judgment, but when a certain node sends 1 time of synchronous phasor data according to the interval number cycle, after waiting for reasonable communication delay time, the other node phasor data which is not received by the node in the cycle is synchronously filled with the latest received node phasor data according to the time sequence of the whole cycle, but at the moment, the differential protection does not act instantaneously but is set as action time according to the node (the latest phasor data sending interval cycle +2 cycles), and the action time continuously meets the differential protection action condition and then acts to be released to jump away from the node switch.
When a high-voltage line has a fault, each node respectively senses the voltage and current of the node installation position to change in a sudden change amount, and once the node detects that the voltage or current changes in a sudden change amount and continuous multiple points meet the following formula, a sudden change amount starting mark of the node is set;
After the sudden change of the node is started, the sampling data of the node is actively sent to other nodes of differential protection according to the sampling point number X for the differential protection of each cycle from a first sudden change point, the sampling data comprises a sudden change starting mark of the node, and simultaneously, the phasor data of the node is sent to other nodes of the differential protection according to 1 time of each cycle; after 1 cycle is completed from the first catastrophe point, the node catastrophe cycle phasor data of the initial point calculated by taking the first catastrophe point as phasor is transmitted to other nodes of differential protection for 1 time; the second and the later cycles after the start of the mutation quantity do not additionally send the mutation cycle phasor data;
after any node of the differential protection receives the initial setting of the sudden change starting flag of other nodes and the sampling point data for the differential protection, if the node does not set the sudden change starting flag, the sudden change starting flag of the node is set, the first sudden change of the early-occurring sudden change node device starts to actively send the sampling data of the node to other nodes of the differential protection according to the sampling point number X for the differential protection of each cycle, and simultaneously, the phasor data of the node is sent to other nodes of the differential protection according to 1 time of each cycle.
When the sampling point data of other nodes subjected to differential protection is full of 1/4 cycles, starting a rapid sampling point differential protection algorithm, performing 1-time sampling point differential protection data operation and logic judgment on each sampling point, and simultaneously keeping 1-time phasor differential protection data operation and logic judgment on each cycle; the sampling point differential protection and the phasor differential protection run in parallel, and after any differential protection action condition is met, instantaneous action trips the node switch.
After the sudden change starting flag of the node is set, if the continuous judgment of the differential protection in the Y cycle does not meet the action condition all the time, the sudden change starting flag setting state of the node is cancelled, the sampling data of the node is not sent according to the sampling point number X for the differential protection of each cycle, the phasor data of the node is only sent to other nodes of the differential protection 1 time per cycle or 1 time per cycle, each differential protection node carries out 1 time of phase 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 has the same format as the abrupt change cycle phasor data frame, 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 synchronization mark, a sampling sequence number of a first sampling point of the phasor data, a sampling time label of the sampling sequence number, three-phase voltage phasor data, three-phase current phasor data, a switching value and logic control information, wherein the logic control information comprises a local node mutation value 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, a local node system frequency, a sampling synchronization mark, a sampling sequence number and a sampling time label of the local sampling point, three-phase voltage sampling point data, three-phase current sampling point data, a switching value and logic control information, wherein the logic control information comprises a local node mutation value starting mark, a phasor differential protection action mark and a sampling point differential protection action mark;
furthermore, the method also comprises the following steps of,
all phasor data frames and sampling point data frames are repeatedly sent for 2 times so as to ensure that correct data frames can still be received in time when the wireless communication is subjected to accidental error codes;
after the node performs differential protection spontaneous action, the differential protection action node actively sends phasor differential protection action data frames or sampling point differential protection action data frames to other nodes;
the data information carried by the phasor differential protection action data frame message comprises: the phasor differential protection action data frame mark, the main node mark, the node number, the external time service mark, the sampling sequence number and the sampling time label of the first sampling point of the phasor data for calculating the phasor differential protection action, the three-phase voltage phasor data, the three-phase current phasor data, the switching value and the logic control information;
the data information carried by the sampling point differential protection action data frame message comprises: the system comprises a sampling point differential protection action data frame mark, a main node mark, a local node number, an external time service mark, a local node system frequency, a sampling synchronization mark, a sampling sequence number of a last sampling point for calculating the sampling point differential protection action and a sampling time label thereof, three-phase voltage sampling point data, three-phase current sampling point data, a switching value and logic control information.
If the differential protection of other differential protection nodes does not act, comparing the received differential protection action data frame message with the cache information of the node to judge the information consistency, if the information is completely consistent, setting the differential protection action mark of the node and controlling the trip outlet of the node, but the differential protection action data frame is not sent due to the spontaneous action of the differential protection of the node.
In yet another aspect, the present 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 still another aspect, the present invention also discloses an embedded computer device, which includes a memory and a processor, wherein the memory stores an embedded computer program, and the embedded computer program, when executed by the processor, causes the processor to execute the steps of the method.
According to the technical scheme, the data transmission and protection system and method applicable to 5G differential protection have the following beneficial effects:
1. under the normal operation state, the sampling point data is not sent, only the phasor data is sent once every cycle or every several cycles, and the wireless flow generated by the differential protection is greatly reduced.
Transmitting 1 time phasor data every ten cycles, transmitting 50 bytes per frame, calculating and transmitting twice, wherein the transmitting flow of a single node per month is as follows: the flow rate of the intelligent substation optical fiber longitudinal differential protection system is only less than 2% of the flow rate sent once according to 80 points/cycle sampling points and phasor data of the intelligent substation optical fiber longitudinal differential protection, wherein the flow rate is 50 bytes multiplied by 2 times multiplied by 50Hz multiplied by (1/10 interval cycles) multiplied by 60 seconds multiplied by 60 minutes multiplied by 24 hours multiplied by 30 days which is 1.296 GB.
2. By repeatedly sending a small amount of data, the adverse effect caused by accidental error codes of wireless communication is greatly reduced under the condition that the whole flow is controllable, the correct transmission and reception of differential protection data at the moment of failure can be ensured, and the quick action of differential protection can be ensured without complex algorithms such as interpolation and the like.
3. When a serious fault occurs, each node can be started suddenly and sends differential protection full sampling point data, the fault can be identified quickly according to a sampling point quick differential protection algorithm, a differential protection action tripping outlet can be realized by receiving 5-8 sampling point data at the fastest speed, and the time is prolonged by tens of milliseconds compared with the phasor differential protection action time.
4. For light faults, if voltage and current sudden changes occur in the sampling points in the middle of normal phasor calculation, and point loss still occurs in the sampling point data under extreme conditions, so that differential motion of the sampling points cannot be accurately performed, compensation can be performed again through an additional sudden change cycle phasor data frame, rapid tripping can be realized only through cycle data after the differential protection failure is obtained, and the action time is averagely prolonged by 10ms compared with the action time of waiting for normal phasor differential data frame to trip again. That is to say, when a light fault occurs and a sampling point loses a point, the rapid action characteristic of differential protection can be realized without complex interpolation operation.
5. When slight fault occurs, if sudden change quantity can not be started, phasor differential protection can still be performed once per cycle of 20ms, so that the sensitivity and selectivity advantages of differential protection and rapid action tripping are exerted.
6. The differential protection method has the advantages that for the condition that differential protection of all nodes cannot synchronously act to trip due to slight power supply failure of a single-ended power supply and other special conditions, differential protection acting data frames are sent by the differential protection spontaneous acting nodes, the remote safe trip effect of differential protection non-acting nodes is achieved, particularly, information consistency comparison is carried out on historical cache data contained in the differential protection acting data frames, and the risk of data intrusion and false trip caused by a single remote trip signal is greatly reduced.
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FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a flow chart of the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, 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 this 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 time service module;
each end node of the differential protection control module is provided with one set of the hardware device, or each end node is provided with two sets of the hardware devices to form a dual differential protection system;
and the differential protection control module is used for completing voltage and current electrical information acquisition, logic operation and tripping and closing control of a breaker at the node, and has necessary 5G communication, external accurate time service and operation maintenance interfaces.
And the external accurate time service module completes time service for differentially protecting each end node based on external accurate time service systems such as Beidou time service, GPS time service, 5G time service or multi-mode hybrid application and the like.
And the 5G communication module is used for finishing data communication between the modules of the differential protection device at each end of the line based on a 5G communication network. Each node 5G communicates to send 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 several cycles or 1 time per sampling interval, and the effective data information of the messages comprises: the system comprises a main node mark, a local node number, an external time service mark, a local node system frequency, a sampling synchronization mark, a first sampling point of phasor data or a sampling sequence number and a sampling point time tag of the sampling point of the sampling data, three-phase voltage data, three-phase current data, a switching value and logic control information.
As shown in fig. 2, the specific protection method of the differential protection control module is as follows:
1. after all node devices operate, synchronous control of sampling is achieved and maintained continuously according to the number X of sampling points for each cycle differential protection. (X is typically 16 or 20 or 24)
2. When the node device normally operates, the 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 controlling the interval frequency of sending the synchronous phasor data according to the amplitude or the angle stability of the phasor data of the node. All differential protection devices uniformly set amplitude stability threshold values V1, V2 and V3 according to percentage numbers of rated values of analog quantities, uniformly set angle stability threshold values D1, D2 and D3 according to angle differences, transmit phasor data for the previous time as a reference, and transmit for 1 time every cycle if amplitude change exceeds V3 or angle change exceeds D3; otherwise, if the amplitude change exceeds V2 or the angle change exceeds D2, the signal is transmitted for 1 time every two cycles; otherwise, if the amplitude change exceeds V1 or the angle change exceeds D1, the signal is sent for 1 time every five cycles; otherwise if the amplitude variation is within the range of V1 and the angle variation is within the range of D1, then transmit 1 time every ten cycles. The amplitude stability thresholds V1, V2 and V3 can be selected by referring to 1%, 2% and 5%, and the angle stability thresholds D1, D2 and D3 can be selected by referring to 1 °, 2 ° and 5 °.
When the node normally operates, all nodes keep each cycle to carry out 1 time of phasor differential protection data operation and logic judgment, but when a certain node sends 1 time of synchronous phasor data according to the interval number cycle, after waiting for reasonable communication delay time, the other node phasor data which is not received by the node in the cycle is synchronously filled with the latest received node phasor data according to the time sequence of the whole cycle, but at the moment, the differential protection does not act instantaneously but is set as action time according to the node (the latest phasor data sending interval cycle +2 cycles), and the action time continuously meets the differential protection action condition and then acts to be released to jump away from the node switch.
3. When a high-voltage line has a serious fault, each node respectively senses the voltage and current change of the node installation position, and once the node detects that the voltage or current change and continuous multiple points meet the following formula, the node break variable starting mark is set.
After the sudden change of the node is started, the sampling data of the node is actively sent to other nodes of differential protection according to the sampling point number X for the differential protection of each cycle from the first sudden change point, the sampling data comprises a sudden change starting mark of the node, and simultaneously, the phasor data of the node is sent to other nodes of the differential protection according to 1 time of each cycle. And after 1 cycle is completed from the first catastrophe point, the node catastrophe cycle phasor data of the initial point calculated by taking the first catastrophe point as phasor is transmitted to other nodes of the differential protection for 1 time. And the second and the later cycles after the start of the mutation quantity do not additionally transmit the mutation cycle phasor data.
4. After any node of the differential protection receives initial setting of a sudden change starting sign of other nodes and sampling point data for the differential protection, if the node does not set the sudden change starting sign, the sudden change starting sign of the node is set, the first sudden change point of the early-occurring sudden change node device starts to actively send the sampling data of the node to other nodes of the differential protection according to the sampling point number X for the differential protection of each cycle, and simultaneously, 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 sampling point data of other nodes under differential protection for 1/4 cycles, the rapid sampling point differential protection algorithm is started, each sampling point performs 1-time sampling point differential protection data operation and logic judgment, and simultaneously, each cycle is kept to perform 1-time phasor differential protection data operation and logic judgment. The sampling point differential protection and the phasor differential protection run in parallel, and after any differential protection action condition is met, instantaneous action trips the node switch.
6. After the sudden change starting flag of the node is set, if the condition that the differential protection does not meet the action condition all the time is continuously judged in the Y cycle, the sudden change starting flag setting state of the node is cancelled, the sampling data of the node is not sent according to the sampling point number X for the differential protection of each cycle, the phasor data of the node is sent to other nodes of the differential protection only according to 1 time of each cycle or 1 time of each cycle, and each differential protection node carries out 1 time of phasor differential protection data operation and logic judgment every 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 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 synchronization mark, a sampling sequence number of a first sampling point of the phasor data and a sampling time label thereof, three-phase voltage phasor data, three-phase current phasor data, a switching value and logic control information, wherein the logic control information comprises a local node discontinuity starting mark, a phasor differential protection action mark, a 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, a local node system frequency, a sampling synchronization mark, a sampling sequence number and a sampling time label of the local sampling point, three-phase voltage sampling point data, three-phase current sampling point data, a switching value and logic control information, wherein the logic control information comprises a local node mutation value starting mark, a phasor differential protection action mark, a sampling point differential protection action mark and the like.
9. Considering that individual data receiving fails due to error code problems possibly existing in 5G wireless communication, all phasor data frames and sampling point data frames are repeatedly sent for 2 times in the scheme, so that correct data frames can still be received in time when the error codes happen to the wireless communication.
10. Theoretically, because all differential protection nodes have the same data for differential protection, the differential protection of each node should have the same action behavior, but in order to prevent unexpected situations such as slight fault calculation error of action boundary or communication influence from causing that the differential protection of each node cannot act simultaneously, the differential protection action node actively sends phasor differential protection action data frames or sampling point differential protection action data frames to other nodes after the differential protection of the node acts spontaneously.
The data information carried by the phasor differential protection action data frame message comprises: the phasor differential protection action data frame mark, the main node mark, the node number, the external time service mark, the sampling sequence number and the sampling time label of the first sampling point of the phasor data for phasor differential protection action calculation, the three-phase voltage phasor data, the three-phase current phasor data, the switching value and the logic control information.
The data information carried by the sampling point differential protection action data frame message comprises: the system comprises a sampling point differential protection action data frame mark, a main node mark, a local node number, an external time service mark, a local node system frequency, a sampling synchronization mark, a sampling sequence number of a last sampling point for calculating the sampling point differential protection action and a sampling time label thereof, three-phase voltage sampling point data, three-phase current sampling point data, a switching value and logic control information.
If the differential protection of other differential protection nodes does not act, comparing the received differential protection action data frame message with the cache information of the node to judge the information consistency, if the information is completely consistent, setting the differential protection action mark of the node and controlling the trip outlet of the node, but the differential protection action data frame is not sent due to the spontaneous action of the differential protection of the node.
The invention has the beneficial effects that:
1. under the normal operation state, the sampling point data is not sent, only the phasor data is sent once every cycle or every several cycles, and the wireless flow generated by the differential protection is greatly reduced.
Transmitting 1 time phasor data every ten cycles, transmitting 50 bytes per frame, calculating and transmitting twice, wherein the transmitting flow of a single node per month is as follows: the flow rate of the intelligent substation optical fiber is only less than 2% of the flow rate sent once according to the intelligent substation optical fiber longitudinal differential protection 80 points/cycle sampling points and phasor data.
2. By repeatedly sending a small amount of data, the adverse effect caused by accidental error codes of wireless communication is greatly reduced under the condition that the whole flow is controllable, the correct transmission and reception of differential protection data at the moment of failure can be ensured, and the quick action of differential protection can be ensured without complex algorithms such as interpolation and the like.
3. When a serious fault occurs, each node can be started suddenly and sends differential protection full sampling point data, the fault can be identified quickly according to a sampling point quick differential protection algorithm, a differential protection action tripping outlet can be realized by receiving 5-8 sampling point data at the fastest speed, and the time is prolonged by tens of milliseconds compared with the phasor differential protection action time.
4. For light faults, if voltage and current sudden changes occur in the sampling points in the middle of normal phasor calculation, and point loss still occurs in the sampling point data under extreme conditions, so that differential motion of the sampling points cannot be accurately performed, compensation can be performed again through an additional sudden change cycle phasor data frame, rapid tripping can be realized only through cycle data after the differential protection failure is obtained, and the action time is averagely prolonged by 10ms compared with the action time of waiting for normal phasor differential data frame to trip again. That is to say, when a light fault occurs and a sampling point loses a point, the rapid action characteristic of differential protection can be realized without complex interpolation operation.
5. When slight fault occurs, if sudden change quantity can not be started, phasor differential protection can still be performed once per cycle of 20ms, so that the sensitivity and selectivity advantages of differential protection and rapid action tripping are exerted.
6. The differential protection method has the advantages that for the condition that differential protection of all nodes cannot synchronously act to trip due to slight power supply failure of a single-ended power supply and other special conditions, differential protection acting data frames are sent by the differential protection spontaneous acting nodes, the remote safe trip effect of differential protection non-acting nodes is achieved, particularly, information consistency comparison is carried out on historical cache data contained in the differential protection acting data frames, and the risk of data intrusion and false trip caused by a single remote trip signal is greatly reduced.
In yet another aspect, the present 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 still another aspect, the present invention also discloses an embedded computer device, which includes a memory and a processor, wherein the memory stores an embedded computer program, and the embedded computer program, when executed by the processor, causes the processor to execute the steps of the method.
It is 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 the explanation, the example and the beneficial effects of the related contents can refer to the corresponding parts in the method.
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.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A little flow 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 precise time service module, and the 5G communication module and the external precise time service module are respectively connected with corresponding interfaces of the differential protection control module;
the method is characterized in that:
each end node is subjected to differential protection and is provided with one 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 content of the first and second substances,
the differential protection control module is used for completing voltage and current electrical information acquisition, logic operation and tripping and closing control of a circuit breaker at the node;
the external accurate time service module is used for completing time service of differentially protecting each end node based on Beidou time service, GPS time service, 5G time service or multi-mode mixed application of the external accurate time service systems;
and the 5G communication module is used for finishing data communication between the modules of the differential protection device at each end of the line based on a 5G communication network.
2. The low traffic data transmission and protection system adapted for 5G differential protection according to claim 1, wherein: each node 5G communicates to send 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 several cycles or 1 time per sampling interval, and the effective data information of the messages comprises: the system comprises a main node mark, a local node number, an external time service mark, a local node system frequency, a sampling synchronization mark, a first sampling point of phasor data or a sampling sequence number and a sampling point time tag of the sampling point of the sampling data, three-phase voltage data, three-phase current data, a switching value and logic control information.
3. A data transmission and protection method suitable for 5G differential protection, based on the differential protection control module of the system of claim 1 or 2, characterized in that: comprises the following steps of (a) carrying out,
after all node devices operate, the synchronous control of sampling is realized and continuously maintained according to the sampling point number X for the weekly wave differential protection, wherein X is 16, 20 or 24;
when the device normally operates, each node device sends the synchronous phasor data of the node to other nodes of differential protection according to 1 time per cycle or 1 time per several cycles, and the sampling point data is not sent;
controlling the interval frequency of sending the synchronous phasor data according to the amplitude or the angle stability of the phasor data of the node;
all differential protection devices uniformly set amplitude stability threshold values V1, V2 and V3 according to percentage numbers of rated values of analog quantities, uniformly set angle stability threshold values D1, D2 and D3 according to angle differences, transmit phasor data for the previous time as a reference, and transmit for 1 time every cycle if amplitude change exceeds V3 or angle change exceeds D3; otherwise, if the amplitude change exceeds V2 or the angle change exceeds D2, the signal is transmitted for 1 time every two cycles; otherwise, if the amplitude change exceeds V1 or the angle change exceeds D1, the signal is sent for 1 time every five cycles; otherwise, if the amplitude change is within the range of V1 and the angle change is within the range of D1, the signals are transmitted for 1 time every ten cycles; the amplitude stability thresholds V1, V2 and V3 are selected at 1%, 2% and 5%, and the angle stability thresholds D1, D2 and D3 are selected at 1 °, 2 ° and 5 °;
when the node normally operates, all nodes keep each cycle to carry out 1 time of phasor differential protection data operation and logic judgment, but when a certain node sends 1 time of synchronous phasor data according to the interval number cycle, after waiting for reasonable communication delay time, the other node phasor data which is not received by the node in the cycle is synchronously filled with the latest received node phasor data according to the time sequence of the whole cycle, but at the moment, the differential protection does not act instantaneously, but acts for jumping from the node switch according to the node, namely the latest phasor data sending interval cycle +2 cycle, and the action time continuously meets the differential protection action condition.
4. The data transmission and protection method suitable for 5G differential protection according to claim 3, wherein: when a high-voltage line has a fault, each node respectively senses the voltage and current of the node installation position to change in a sudden change, and once the node detects that the voltage or the current changes in a sudden change and continuous multiple points meet the following formula, a sudden change starting mark of the node is set;
after the sudden change of the node is started, the sampling data of the node is actively sent to other nodes of differential protection according to the sampling point number X for the differential protection of each cycle from a first sudden change point, the sampling data comprises a sudden change starting mark of the node, and simultaneously, the phasor data of the node is sent to other nodes of the differential protection according to 1 time of each cycle; after 1 cycle is completed from the first catastrophe point, the node catastrophe cycle phasor data of the initial point calculated by taking the first catastrophe point as phasor is transmitted to other nodes of differential protection for 1 time; the second and the later cycles after the start of the mutation quantity do not additionally send the mutation cycle phasor data;
after any node of the differential protection receives the initial setting of the sudden change starting flag of other nodes and the sampling point data for the differential protection, if the node does not set the sudden change starting flag, the sudden change starting flag of the node is set, the first sudden change of the early-occurring sudden change node device starts to actively send the sampling data of the node to other nodes of the differential protection according to the sampling point number X for the differential protection of each cycle, and simultaneously, the phasor data of the node is sent to other nodes of the differential protection according to 1 time of each cycle.
5. The data transmission and protection method suitable for 5G differential protection according to claim 4, wherein: when the node receives sampling point data of other nodes under differential protection for 1/4 cycles, starting a rapid sampling point differential protection algorithm, performing 1-time sampling point differential protection data operation and logic judgment on each sampling point, and simultaneously keeping 1-time phasor differential protection data operation and logic judgment on each cycle; the sampling point differential protection and the phasor differential protection run in parallel, and after any differential protection action condition is met, instantaneous action trips the node switch.
6. The data transmission and protection method suitable for 5G differential protection according to claim 5, wherein: after the sudden change starting flag of the node is set, if the condition that the differential protection does not meet the action condition all the time is continuously judged in the Y cycle, the sudden change starting flag setting state of the node is cancelled, the sampling data of the node is not sent according to the sampling point number X for the differential protection of each cycle, the phasor data of the node is sent to other nodes of the differential protection only according to 1 time of each cycle or 1 time of each cycle, each differential protection node carries out 1 time of operation and logic judgment on the phasor differential protection data, and Y is an integer between 2 and 8.
7. The data transmission and protection method suitable for 5G differential protection according to claim 6, wherein: the normal operation phasor data frame has the same format as the mutation cycle phasor data frame, 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 synchronization mark, a sampling sequence number of a first sampling point of the phasor data, a sampling time label of the sampling sequence number, three-phase voltage phasor data, three-phase current phasor data, a switching value and logic control information, wherein the logic control information comprises a local node mutation value 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, a local node system frequency, a sampling synchronization mark, a sampling sequence number of a local sampling point and a sampling time label thereof, three-phase voltage sampling point data, three-phase current sampling point data, a switching value and logic control information, wherein the logic control information comprises a local node mutation value starting mark, a phasor differential protection action mark and a sampling point differential protection action mark.
8. The data transmission and protection method suitable for 5G differential protection according to claim 7, wherein: also comprises the following steps of (1) preparing,
all phasor data frames and sampling point data frames are repeatedly sent for 2 times so as to ensure that correct data frames can still be received in time when the wireless communication is subjected to accidental error codes;
after the node performs differential protection spontaneous action, the differential protection action node actively sends phasor differential protection action data frames or sampling point differential protection action data frames to other nodes;
the data information carried by the phasor differential protection action data frame message comprises: the phasor differential protection action data frame mark, the main node mark, the node number, the external time service mark, the sampling sequence number and the sampling time label of the first sampling point of the phasor data for calculating the phasor differential protection action, the three-phase voltage phasor data, the three-phase current phasor data, the switching value and the logic control information;
the data information carried by the sampling point differential protection action data frame message comprises: the system comprises a sampling point differential protection action data frame mark, a main node mark, a local node number, an external time service mark, a local node system frequency, a sampling synchronization mark, a sampling sequence number of a last sampling point for calculating the sampling point differential protection action and a sampling time label thereof, three-phase voltage sampling point data, three-phase current sampling point data, a switching value and logic control information.
If the differential protection of other differential protection nodes does not act, comparing the received differential protection action data frame message with the cache information of the node to judge the information consistency, if the information is completely consistent, setting the differential protection action mark of the node and controlling the trip outlet of the node, but the differential protection action data frame is not sent due to the spontaneous action of the differential protection of the node.
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 3 to 8.
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 according to any one of claims 3 to 8.
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