CN117459915A - 5G direct transmission-based distribution network remote real-time distributed synchronous test method and system - Google Patents
5G direct transmission-based distribution network remote real-time distributed synchronous test method and system Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
- H04L69/164—Adaptation or special uses of UDP protocol
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/10—Flow control between communication endpoints
- H04W28/14—Flow control between communication endpoints using intermediate storage
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/14—Direct-mode setup
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Abstract
The invention relates to a 5G direct transmission-based distribution network remote real-time distributed synchronous test method and a system, wherein the method comprises the following steps: generating an analog small signal and a switching value signal by using RTDS, and converting the analog small signal and the switching value signal into a message in a preset form; and transmitting the message to a remote distributed simulation terminal in a point-to-point direct transmission mode by using a 5G CPE, converting the message into an analog voltage and current signal and a switching value output signal by using the simulation terminal, and transmitting the analog voltage and current signal and the switching value output signal to a power distribution terminal corresponding to the simulation terminal to complete a simulation test, wherein the 5G CPE receives the message based on an anti-lost frame buffer method by setting two buffer areas, and the simulation terminal determines the moment of message conversion based on a preset network delay. Compared with the prior art, the invention has the advantages of ensuring the continuity of each frame of the message, ensuring the output synchronism of the simulation terminal, and the like.
Description
Technical Field
The invention relates to the technical field of power distribution network testing, in particular to a 5G direct transmission-based remote real-time distributed synchronous testing method and system for a power distribution network.
Background
With importance of electricity safety and reliability, the power distribution automation terminal is used as an important device for distribution network automation, and the stability and reliability of functions and performances of the power distribution automation terminal directly influence the electricity safety and property safety of industry and residents. For countries with wide areas, numerous population and large industrial mass, the corresponding distribution network projects are very large, and the corresponding distribution terminals are huge in scale. In order to realize safe and reliable distribution network, related enterprises and units need to input a large amount of manpower and material resources to carry out detection test of the distribution terminal no matter from the factory detection of the distribution terminal manufacturer or the acceptance detection and annual check-up test of the power supplier.
The functions of positioning and isolating faults of the power distribution network and recovering power supply in non-fault areas are important functions of a power distribution automation system, and are important work for testing the power distribution network. At present, the testing of the power distribution automation system is mostly finished by adopting a subsystem and centralized testing mode. Subsystem testing refers to testing each part of the power distribution automation system separately. The centralized test refers to centralized installation of relevant equipment of the distribution automation system in a laboratory, the distribution terminals are interconnected with the distribution substation and the distribution master station through a short-distance wired transmission network, and the functions of the distribution automation system are verified by simulating distribution network faults through a real-time digital simulation system (Real Time Digital System, RTDS) or a special distribution network simulation system.
The subsystem and the centralized test scheme can well perform simulation test on the overall performance and the functions of the power distribution automation system, but are limited by the complexity of the system structure, the volume weight of equipment and the like, and the system can only be applied to laboratories at present, and the system is not effective and real simulation test means or technology aiming at the field time detection of the power distribution automation terminal and the power distribution automation network system.
Chinese patent application publication No. CN107167680a discloses a distributed testing system for a power distribution network based on an RTDS, on the basis of the RTDS, the output function of simulation data is distributed to a plurality of simulation terminals running synchronously, each simulation terminal is arranged on the installation position of the power distribution terminal, on one hand, the simulation data from the RTDS is remotely received and output, on the other hand, the response information of the power distribution terminal to be tested is received and fed back to the RTDS, so as to realize the closed loop test of the power distribution automation system with real-time communication susceptible to the network.
However, the above application still has some drawbacks, such as a large delay, a failure to guarantee the communication timeliness, and poor synchronization, which are caused by implementing wireless communication based on the 4G module.
In summary, there is currently a lack of a test method that overcomes or partially overcomes the above-described deficiencies.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a 5G direct transmission-based distribution network remote real-time distributed synchronous test method and system so as to ensure the timeliness and synchronism of the test.
The aim of the invention can be achieved by the following technical scheme:
the invention provides a 5G direct transmission-based distribution network remote real-time distributed synchronous test method, which comprises the following steps:
generating an analog small signal and a switching value signal by using RTDS, and converting the analog small signal and the switching value signal into a message in a preset form;
and transmitting the message to a remote distributed simulation terminal in a point-to-point direct transmission mode by using a 5G CPE, converting the message into an analog voltage and current signal and a switching value output signal by using the simulation terminal, and transmitting the analog voltage and current signal and the switching value output signal to a power distribution terminal corresponding to the simulation terminal to finish the simulation test.
And in the 5G CPE, receiving the message based on the anti-lost frame buffer method by setting two buffer areas, and determining the moment of message conversion based on the preset network delay in the simulation terminal.
As a preferred technical solution, the method for buffering frames against frame loss includes:
receiving a frame of the message, judging whether the sampling sequence number Y of the received frame is continuous with the sampling sequence number X of the previous frame, if so, storing the received frame in a first buffer area according to a first-in first-out principle, repeating the steps, and if not, storing the received frame in a second buffer area according to the first-out principle;
receiving the next frame of the message, judging whether the sampling sequence number of the received frame is X+1, if so, storing the received frame in a first buffer area according to a first-in first-out principle, and storing the frame in a second buffer area in the first buffer area, if not, storing the received frame in the second buffer area according to a first-in first-out principle, and repeating the step until the sampling sequence number of the received frame is X+1;
if the second buffer area is full and the received frame sampling sequence number is not X+1, interpolating and storing the frames with the sampling sequence numbers of X and X+2 into the first buffer area, and storing the frames in the second buffer area into the first buffer area.
As a preferable technical scheme, the sampling sequence number is set based on the sampling rate of the message.
As a preferable technical scheme, after the frames in the second buffer area are stored in the first buffer area, the frames stored in the second buffer area are emptied.
As a preferable technical scheme, the capacity of the first buffer area is larger than the capacity of the second buffer area.
As a preferred embodiment, the sampling sequence number is cyclically allocated to each frame.
As a preferred technical solution, the determining the moment of message conversion based on the preset network delay includes:
after receiving a message with the sending time of T2, different simulation terminals convert the message into an analog voltage current signal and a switching value output signal at the time of T2+Z, wherein Z is a preset network delay.
As a preferable technical scheme, the network delay is larger than the stable delay of the 5G network.
The invention also provides a 5G direct transmission-based distribution network remote real-time distributed synchronous test system, which is used for realizing the distribution network remote real-time distributed synchronous test method, and comprises the following steps:
the RTDS simulation system is used for generating an analog small signal and a switching value signal;
the simulation interface device is used for converting the output of the RTDS simulation system into a message;
the 5G CPE system comprises two buffer areas and is used for storing the message based on an anti-lost frame buffer method;
the simulation terminals are used for receiving the messages and converting the messages based on preset network time delay;
and the power distribution terminals are in one-to-one correspondence with the simulation terminals and are used for completing simulation tests based on the analog voltage and current signals and the switching value output signals obtained through conversion.
As a preferred technical solution, the 5G CPE system includes a local end and a plurality of remote ends arranged in a distributed manner and connected with the local end, the local end is connected with the emulation interface device, and the remote ends are connected with the emulation terminal.
Compared with the prior art, the invention has the following beneficial effects:
(1) Ensuring the continuity of each frame of the message: in the point-to-point real-time direct transmission process of the digital UDP application message, two buffer areas are arranged in the 5G CPE, the message is received based on the anti-lost frame buffer method, the conditions of frame loss, frame missing and the like can be processed, the application data is reliably and remotely transmitted by using a point-to-point direct transmission mode and a double-data buffer method, and the accuracy and the reliability of message data receiving are ensured.
(2) The output synchronism of the simulation terminal is ensured: in the distributed real-time transmission process, the moment of message conversion is determined on one side of the simulation terminal based on the preset network time delay, the RTDS simulation signals are transmitted to different power distribution terminal sites in a real-time and decentralized manner by utilizing a clock synchronization method in cooperation with a 5G network, and finally, the RTDS analog quantity small signals and the switching value signals are converted and output into secondary analog quantity signals and switching value signals by the 5G network under the cooperation of the simulation interface device and the simulation terminal, so that the field test application of virtually moving the RTDS simulation system from the application of a laboratory to the power distribution automation terminal system is realized, and the field integral effective simulation test of the power distribution automation system is completed.
Drawings
FIG. 1 is a block chain diagram of a power distribution network operation control in an embodiment;
FIG. 2 is a schematic diagram of a fault isolation operation command transmission flow;
figure 3 is a schematic diagram of operational node consensus algorithm selection,
the system comprises a RTDS simulation system 1, a simulation interface device 2, a CPE system 3 and a CPE system 5G, a simulation terminal 4, a power distribution terminal 5.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1
Aiming at the problems existing in the prior art, the embodiment provides a distribution network remote real-time distributed synchronous test system based on 5G direct transmission, RTDS simulation signals are remotely and respectively transmitted to different distribution automation terminal sites in a 5G network signal direct transmission mode, the RTDS simulation signals are effectively simulated by using an on-site simulation terminal, comprehensive simulation test of the distribution automation terminal and a network system is realized, potential safety hazards of the distribution automation system are timely eliminated, and guarantee is provided for safe and reliable operation of the distribution automation system.
Referring to fig. 1, the system includes an RTDS simulation system 1, a simulation interface device 2, a 5G customer premise equipment (Customer Premise Equipment, CPE) (i.e., 5G CPE system 3), a plurality of simulation terminals 4, and a plurality of distribution terminals 5, connected in sequence.
The 5G CPE system comprises a local end and a plurality of remote ends which are distributed and are connected with the local end, wherein the local end is connected with the simulation interface device, and the remote ends are connected with the simulation terminal.
The principle implementation process of the distribution network remote real-time distributed synchronous test system based on 5G direct transmission is as follows: the emulation interface device 2 receives the analog small signal and the switching value signal outputted by the RTDS emulation system 1 in an emulation way, and converts the analog small signal and the switching value signal into UDP messages, and the UDP messages are remotely transmitted through the 5G CPE system 3. The simulation terminal 4 receives UDP service application data messages converted and output by the simulation interface device through the 5GCPE system 3, the simulation interface device 2 and the simulation terminal 4 in the local distributed layout adopt a point-to-point communication mode, meanwhile, the simulation terminal analyzes and converts the received UDP messages, finally converts and outputs the received UDP messages into secondary analog voltage and current signals and switching value output signals, and provides the secondary analog voltage and current signals and switching value output signals for the distribution terminal 5 in different local positions, so that the local simulation test of the distribution automation system is completed, and finally the RTDS simulation test is moved to a maintenance site of the distribution terminal system from the laboratory system by utilizing 5G communication.
In the 5G CPE system 3, two buffers are provided to ensure accuracy and reliability of the message received from the emulation interface device 2, and an anti-frame-loss buffer method is used to receive the message.
Referring to fig. 2, which is a schematic diagram of a fault isolation operation instruction transmission flow in a digital UDP application message point-to-point real-time direct transmission process, the simulation interface device 2 and the simulation terminal 4 directly transmit UDP messages through a 5G network, and considering the network performance of the 5G network and the stability of the transmitted data, the sampling rate of the UDP messages is 4k, that is, each frame of message is spaced by 0.25ms, and the sampling sequence numbers of the messages are circularly changed from 0 to 3999. The simulation terminal opens up two UDP message buffer areas, namely a buffer area 1 and a buffer area 2, wherein the buffer area 1 can store 20ms UDP messages of 80 frames, and the buffer area 2 can store 10ms UDP messages of 40 frames.
The simulation terminal 4 firstly judges whether the sampling sequence number Y is continuous with the sampling sequence number X of the previous frame or not, and directly stores the continuous sampling sequence number Y in the buffer zone 1, when the continuous sampling sequence number X is discontinuous, the buffer zone 2 is triggered to store the frame message, then the received message judges whether the sampling sequence number is X+1 or not, if yes, the buffer zone 1 is triggered to store normally, and the message of the sampling sequence number Y is timely regulated to the buffer zone 1 by the buffer zone 2, otherwise, the subsequent message is stored in the buffer zone 2 until the UDP message of the sampling sequence number X+1 appears, and the subsequent message is stored in the buffer zone 1, and is completely transplanted and regulated to the buffer zone 1 according to the sequence of the sampling sequence number X+1, meanwhile, if the message of the sampling sequence number X+1 is not fully stored in the buffer zone 2, the message of the sampling sequence number X+1 is considered to be lost, interpolation compensation is carried out according to the previous and subsequent frames of the message, and the data of the buffer zone 2 is transplanted to the buffer zone 1.
The buffer area 1 always has continuous messages with sampling sequence numbers, and the principle of first-in first-out is kept, corresponding UDP messages are sequentially converted into analog quantity output, and finally, the data transmission and conversion of the simulation interface device and the simulation terminal by the UDP messages through a 5G network are realized.
In order to ensure the consistency of the time when each simulation terminal 3 converts the message so as to achieve the effect of synchronous test, in the simulation terminal 4, the time when the message is converted is determined based on the preset network delay.
Referring to fig. 3, a schematic diagram of selection of an operation node consensus algorithm in a distributed synchronous real-time transmission process is shown, a time when a simulation interface device receives a small signal such as an RTDS analog small signal is denoted as T1, a time when the RTDS analog small signal is converted into a UDP message, the UDP message is output and recorded as T2, and meanwhile, when the output time T2 is written into the UDP message, the T2-T1 is a conversion output delay of the simulation interface device. The time when the simulation terminal receives the UDP message transmitted through the 5G network is recorded as T3, the time when the simulation terminal converts the UDP message into a secondary analog signal, and the output time when the simulation terminal outputs the secondary analog signal is recorded as T4, and the T4-T3 is the conversion output delay of the simulation terminal. The 5G network delay is T3-T2 and the system conversion and transmission delay is T4-T1. Through test verification, the conversion output delay T2-T1 and T4-T3 of the simulation interface device and the simulation terminal are about 1ms, the 5G network stability delay is about T3-T2 not more than 10ms, and the overall conversion and transmission delay T4-T1 of the system is about 12ms.
In order to ensure that different simulation terminals can synchronously output to different power distribution terminals, the 5G network delay is fixedly set to 20ms, namely, after the different simulation terminals receive the UPD message with the sending time of T2, the delay T2+20ms carries out data conversion output, so that the different simulation terminals can synchronously output according to an RTDS simulation system. Meanwhile, the conversion and transmission delay of the whole system is T4-T1 +10ms=22ms, and finally the real-time synchronous completion of RTDS remote simulation test of the whole system is realized.
Example 2
On the basis of embodiment 1, the embodiment provides a distribution network remote real-time distributed synchronous test method based on 5G direct transmission, which comprises the following steps:
s1, generating an analog small signal and a switching value signal by using RTDS, and converting the analog small signal and the switching value signal into a message in a preset form;
s2, transmitting the message to a remote distributed simulation terminal in a point-to-point direct transmission mode by using the 5G CPE, converting the message into an analog voltage and current signal and a switching value output signal by using the simulation terminal, and transmitting the analog voltage and current signal and the switching value output signal to a power distribution terminal corresponding to the simulation terminal to finish the simulation test.
In the 5G CPE, the message is received based on the anti-lost frame buffer method by setting two buffer areas, and in the simulation terminal, the moment of message conversion is determined based on the preset network delay.
The invention discloses a remote real-time distributed synchronous test method and a remote real-time distributed synchronous test system for a distribution network based on 5G direct transmission, which solve the problems that the whole distribution automation equipment cannot be matched and tested in a performance simulation mode at the scene of a distribution automation terminal at present and have the defects of large delay and poor communication timeliness and synchronism.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. A distribution network remote real-time distributed synchronous test method based on 5G direct transmission is characterized by comprising the following steps:
generating an analog small signal and a switching value signal by using RTDS, and converting the analog small signal and the switching value signal into a message in a preset form;
transmitting the message to a remote distributed simulation terminal in a point-to-point direct transmission mode by using a 5G CPE, converting the message into an analog voltage and current signal and a switching value output signal by using the simulation terminal, and transmitting the analog voltage and current signal and the switching value output signal to a power distribution terminal corresponding to the simulation terminal to finish simulation test;
and in the 5G CPE, receiving the message based on the anti-lost frame buffer method by setting two buffer areas, and determining the moment of message conversion based on the preset network delay in the simulation terminal.
2. The method for remote real-time distributed synchronization test of a distribution network based on 5G direct transmission according to claim 1, wherein the method for caching the frame loss prevention comprises the following steps:
receiving a frame of the message, judging whether the sampling sequence number Y of the received frame is continuous with the sampling sequence number X of the previous frame, if so, storing the received frame in a first buffer area according to a first-in first-out principle, repeating the steps, and if not, storing the received frame in a second buffer area according to the first-out principle;
receiving the next frame of the message, judging whether the sampling sequence number of the received frame is X+1, if so, storing the received frame in a first buffer area according to a first-in first-out principle, and storing the frame in a second buffer area in the first buffer area, if not, storing the received frame in the second buffer area according to a first-in first-out principle, and repeating the step until the sampling sequence number of the received frame is X+1;
if the second buffer area is full and the received frame sampling sequence number is not X+1, interpolating and storing the frames with the sampling sequence numbers of X and X+2 into the first buffer area, and storing the frames in the second buffer area into the first buffer area.
3. The method for remote real-time distributed synchronous testing of a distribution network based on 5G direct transmission according to claim 2, wherein the sampling sequence number is set based on the sampling rate of the message.
4. The method for remote real-time distributed synchronization testing of a distribution network based on 5G direct transmission according to claim 2, wherein after the frames in the second buffer are stored in the first buffer, the frames stored in the second buffer are emptied.
5. The method for remote real-time distributed synchronization testing of a distribution network based on 5G direct transmission according to claim 2, wherein the capacity of the first buffer area is larger than the capacity of the second buffer area.
6. The method for remote real-time distributed synchronization testing of a distribution network based on 5G direct transmission according to claim 5, wherein the sampling sequence numbers are circularly distributed to each frame.
7. The method for remote real-time distributed synchronization testing of a distribution network based on 5G direct transmission according to claim 1, wherein determining the moment of message conversion based on the preset network delay comprises:
after receiving a message with the sending time of T2, different simulation terminals convert the message into an analog voltage current signal and a switching value output signal at the time of T2+Z, wherein Z is a preset network delay.
8. The method for remote real-time distributed synchronous testing of the distribution network based on the 5G direct transmission according to claim 1, wherein the network delay is larger than the stability delay of the 5G network.
9. A 5G direct transmission-based distribution network remote real-time distributed synchronization test system for implementing the 5G direct transmission-based distribution network remote real-time distributed synchronization test method as set forth in any one of claims 1 to 8, comprising:
the RTDS simulation system (1) is used for generating an analog quantity small signal and a switching value signal;
the simulation interface device (2) is used for converting the output of the RTDS simulation system (1) into a message;
the 5G CPE system (3) comprises two buffer areas and is used for storing the message based on an anti-lost frame buffer method;
the simulation terminals (4) are used for receiving the messages and converting the messages based on preset network time delay;
and the power distribution terminals (5) are in one-to-one correspondence with the simulation terminals and are used for completing simulation tests based on the analog voltage and current signals and the switching value output signals obtained through conversion.
10. The system according to claim 9, wherein the 5G CPE system comprises a local end and a plurality of remote ends arranged in a distributed manner and connected to the local end, the local end is connected to the emulation interface device, and the remote ends are connected to the emulation terminal.
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| CN202311383550.1A CN117459915B (en) | 2023-10-24 | 5G direct transmission-based distribution network remote real-time distributed synchronous test method and system |
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| CN202311383550.1A CN117459915B (en) | 2023-10-24 | 5G direct transmission-based distribution network remote real-time distributed synchronous test method and system |
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| CN113448308A (en) * | 2021-04-14 | 2021-09-28 | 南方电网科学研究院有限责任公司 | Remote closed-loop test system and method for stability control system |
| CN115865765A (en) * | 2022-11-24 | 2023-03-28 | 辽宁东科电力有限公司 | Remote simulation synchronous test system and method based on multiple data sources |
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