A method for intelligent auxiliary fault judgment of the main station FA in distribution automation

Abstract

The present invention relates to a method for intelligent auxiliary fault judgment of the main station FA in distribution automation. Based on the distribution automation system, the front-end system and intelligent terminals, steps such as the line sending out a fault signal, the front-end system, the distribution automation system, whether there is real-time current and handling the fault are carried out. The dispatcher obtains the real-time current value of the intelligent terminal through telemetry or telecommand, and combines it with the FA fault judgment module to judge whether the fault of the distribution network line is correct. With the implementation of the present invention, the main station can call and measure the current at the time of fault occurrence with one key for the dispatcher to analyze. Whether it is an instantaneous fault or a permanent fault, it can be judged whether the fault really occurs by whether there is fault current in the intelligent terminal of the distribution network switch displayed by the main station. The present invention provides a basis for fault judgment for distribution network dispatchers, improves the accuracy of distribution network fault judgment, improves the power supply reliability of the distribution network, and has high social benefits and popularization value.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution network automation, and particularly relates to a method for intelligent auxiliary fault judgment of a distribution automation master station FA. Background Art

[0002] The distribution network is an important part of the power system, and its safety and reliability will directly affect the national economic development and people's living standards. Improving the analysis of distribution network faults is one of the hot topics in the power industry. With the development of technology, the technical level of distribution network fault analysis has also improved. From the original large-scale manual inspections to the later combination of advanced equipment and communication technology to judge distribution network faults, the efficiency of fault analysis has been improved, and the reliability of the distribution network has been enhanced.

[0003] Currently, within dozens of seconds after a distribution network line fault occurs, the "protection signal + opening signal" or "open-close-open" signal is uploaded through the on-site switch intelligent terminal to start the fault judgment function, so as to quickly detect, locate, isolate, and restore the fault point. The traditional current acquisition method is a periodic acquisition method, that is, the current value can be acquired once at 5, 10, or 15 minutes. However, in this method, if a fault occurs during the acquisition process, the fault current of the on-site switch intelligent terminal cannot be acquired in real time, and only the fault judgment function in the FA of the distribution automation master station can be started to isolate the fault. Therefore, it is inevitable that the distribution automation master station starts the FA under non-fault conditions due to the mis-upload of signals, which not only affects the FA fault index but also causes the dispatcher to make a wrong judgment, thus affecting the operation efficiency of the distribution network. Summary of the Invention

[0004] Aiming at the defects in the background art, the present invention provides a method for intelligent auxiliary fault judgment of a distribution automation master station FA, aiming to solve the problems that the distribution automation master station starts the FA under non-fault conditions due to the mis-upload of signals from the on-site switch intelligent terminal, which not only affects the increase of the FA fault index but also may cause the dispatcher to make a wrong judgment, ultimately resulting in the operation efficiency of the distribution network.

[0005] The technical solution of the present invention is as follows:

[0006] A method for intelligent auxiliary fault judgment of a distribution automation master station FA, based on a distribution automation system, a front-end system, and intelligent terminals, and performing the following steps:

[0007] S1. The line sends out a fault signal: The intelligent terminal transmits the fault signal generated by the collected distribution network line to the front-end system through the communication line;

[0008] S2. Front-end system: The front-end system polls the distribution automation system, analyzes it, and then uploads the current value when a fault occurs in the distribution network line to the distribution automation system;

[0009] S3. Distribution automation system: The distribution automation system activates the FA fault judgment module and sends a telemetry or telecommand to the intelligent terminal to obtain the real-time current value of the intelligent terminal;

[0010] S4. Existence of real-time current: During the processing of FA fault judgment, when there is a real-time current value, it is determined that a fault has occurred in the distribution network and S5 is entered; when there is no real-time current value, it is determined that no fault has occurred in the distribution network and S6 is entered;

[0011] S5. Fault handling: Schedule and handle according to the fault handling process;

[0012] S6. End.

[0013] Further, the intelligent terminal is a switch with network communication performance in the distribution network line.

[0014] Further, the front-end system is a client in the distribution network automation system.

[0015] Further, the distribution automation system is a server in the distribution network automation system.

[0016] Beneficial effects of implementing the present invention: The present invention relates to a method for intelligent auxiliary FA fault judgment of a distribution automation master station. Based on the distribution automation system, the front-end system and the intelligent terminal, and through steps such as the line sending a fault signal, the front-end system, the distribution automation system, the existence of real-time current and fault handling, the dispatcher obtains the real-time current value of the intelligent terminal through a telemetry or telecommand and combines it with the FA fault judgment module to determine whether the fault of the distribution network line is correct. When the present invention is implemented, the master station can poll the current at the time of fault occurrence with one key for the dispatcher to analyze. Whether it is an instantaneous fault or a permanent fault, it can be judged whether the fault actually occurs by whether there is fault current in the intelligent terminal of the distribution network switch displayed by the master station. The present invention provides a basis for fault judgment for the distribution network dispatcher, improves the accuracy of distribution network fault judgment, improves the power supply reliability of the distribution network, and has high social benefits and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 : Flow chart of the present invention;

[0019] Figure 2 : Flow of the embodiment Figure 1 ;

[0020] Figure 3 : Flow of the embodiment Figure 2 ;

[0021] Figure 4 : Human - machine interface 1 of the embodiment;

[0022] Figure 5 : Human - machine interface 2 of the embodiment;

[0023] Figure 6 : Human - machine interface 3 of the embodiment;

[0024] Figure 7 : Human - machine interface 4 of the embodiment;

[0025] Figure 8 : Human - machine interface 5 of the embodiment;

[0026] Figure 9 : Human - machine interface 6 of the embodiment;

[0027] In the figure: intelligent terminal (1); pre - system (2); distribution automation system (3). Among them, Figures 4 to 9 are screenshots of the human - machine interface before and after the implementation of the present invention, only used to reflect the effect of the present invention during operation, and the clarity thereof does not affect the technical solution of the present invention. Specific implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0029] The traditional method for judging faults of on - site switch intelligent terminals is to use the protection information and tripping information uploaded by the terminal as the basis for judging whether the distribution network line has tripped. During this process, false starting of FA may occur due to false information uploaded by the terminal, which further causes the problem of inconsistency between the system and the actual site, increases the number of FA fault indicators, and requires dispatchers to perform corresponding operations, which may lead to misjudgments by dispatchers and increase the corresponding workload, ultimately affecting the operation efficiency of the distribution network.

[0030] Please refer to the appendix Figures 4 to 7, in the traditional mode, within dozens of seconds after a distribution network line fault occurs, the dispatcher starts the fault judgment function by uploading "protection signal + circuit breaker signal" or "open-close-open" signal through the intelligent terminal to achieve rapid detection, location, isolation, and restoration of the fault point. During the judgment process in FA fault judgment, the fault current is not involved, and it can only be seen whether a power outage occurs at the scene through the telemetry curve graph. Since the telemetry curve graph is displayed as a square wave graph, the specific time of the fault still needs to be analyzed manually. Therefore, there are disadvantages such as a single judgment method, low accuracy, and low work efficiency. And the traditional current acquisition method is a periodic acquisition method. The current value can be acquired once at the 5th, 10th, and 15th minutes. If a fault occurs during the periodic acquisition process, the fault current cannot be acquired in real time. Only the fault can be isolated through the fault judgment function window, so it is inevitable that the distribution automation master station starts FA under non-fault conditions due to mis-uploaded signals, which not only affects the FA fault index but also causes the dispatcher to make a wrong judgment, that is, the telemetry data of the terminal is called through the one-key call function on the distribution automation system to judge whether the FA judgment logic is accurate, thereby reducing the efficiency of fault judgment.

[0031] In Attachment Figure 4 and 5 , when judging a permanent fault in the traditional way, the dispatcher can only rely on fault signals and telemetry curves to analyze the fault; for faults with a long power outage, the power outage situation can be reflected from the fault curve, but it is only effective for long-term permanent faults.

[0032] In Attachment Figure 4 and 5 , for faults with a short power outage time, the telemetry curve cannot meet the dispatcher's needs for dispatching and monitoring of on-site equipment, and the occurrence of the fault cannot be judged through this method.

[0033] Please refer to Attachment Figure 1 as shown, the technical solution adopted by the present invention is:

[0034] A method for intelligent auxiliary FA fault judgment of a distribution automation master station, based on the distribution automation system 1, the front-end system 2, and the intelligent terminal 3 as the basic environment, and the following steps are carried out:

[0035] S1. The line issues a fault signal: The intelligent terminal 1 transmits the fault signal generated by the collected distribution network line to the front-end system 2 through the communication line;

[0036] S2. Front-end system: The front-end system 2 calls and analyzes the distribution automation system 3, and then uploads the current value when the distribution network line fails to the distribution automation system 3;

[0037] S3, Distribution Automation System: The distribution automation system 3 activates the FA fault judgment module and sends a telemetry or telecommand to the intelligent terminal 1 to obtain the real-time current value of the intelligent terminal 1;

[0038] S4, Existence of Real-Time Current: During the processing of FA fault judgment, when there is a real-time current value, it is determined that a fault has occurred in the distribution network and proceed to S5; when there is no real-time current value, it is determined that no fault has occurred in the distribution network and proceed to S6;

[0039] S5, Fault Handling: Perform dispatching and handling according to the fault handling process;

[0040] S6, End.

[0041] On the one hand, the present invention improves the data upload function of the distribution automation system, that is, it adds a real-time call program for fault current, and obtains the real-time current value of the intelligent terminal 1 through telemetry or telecommand, thereby increasing the effective basis for fault judgment, and further identifying whether the main station FA's judgment of the distribution network line fault is correct, and ultimately improving the accuracy rate of distribution network fault judgment; on the other hand, the present invention uses a fault judgment method based on the distribution automation system 1, the front-end system 2 and the intelligent terminal 3 as the basic environment, that is, uses the combination of FA fault judgment and fault current to improve the efficiency of distribution automation fault judgment.

[0042] Embodiment:

[0043] Please refer to the appendix Figure 2 , The FA judgment process is a fault intelligent judgment method established based on three parts: the distribution automation system, the front-end system, and the intelligent terminal. When a fault occurs in the line, the intelligent terminal will upload the information collected on-site to the front-end system through the communication module, and the front-end system activates the FA fault judgment function through parsing and displays the FA fault handling process on the human-machine interface.

[0044] Please refer to the appendix Figure 3, adopt the mode of combining FA fault judgment and calling for measured fault current. When a line fault occurs, the current value will be uploaded to the distribution automation system interface through the front-end system and displayed during the FA fault judgment process, enabling the fault current to participate in the fault judgment and improving the fault judgment efficiency of the distribution automation system. In the mode of combining FA fault judgment and calling for measured fault current, when a fault occurs, the distribution automation system will automatically call for the telemetry value of the terminal during the fault and display the real-time data of the terminal telemetry value on the man-machine interface. During the fault handling process, the fault current will be included as an auxiliary condition in the fault judgment. If the measured current value reaches the fault current, the system will determine that the distribution network line has indeed failed, and the dispatcher can perform dispatching operations according to the fault handling process. If the measured current value is in a normal state or does not reach the fault current value, the distribution automation system will determine that there is no fault on-site and it is a mis-upload of terminal information. The dispatcher can make a correct judgment by combining the current value with the FA fault judgment function.

[0045] On the man-machine interaction interface, the FA fault handling process is as follows: the distribution automation system receives the uploaded information from the distribution terminal in real time. When a real fault occurs or the terminal mis-sends information, the FA judgment function of the distribution automation master station is activated. The dispatcher can view the real-time current value at the time of the fault by calling for measurement or retrieving telemetry data with one key. If the measured fault current value of the switch is determined to be a real fault, the dispatcher can notify personnel to go to the site to handle the fault; if there is no fault current when calling for measurement or retrieving telemetry data with one key, it is determined that the terminal has mis-sent a signal, which is a false fault caused by a terminal defect, and personnel can be arranged to eliminate the terminal defect, achieving the original intention of the invention of accurate judgment of distribution network faults.

[0046] Please refer to Appendix Figure 8 and 9 , the present invention can call for the current at the time of the fault with one key by the master station for the analysis of dispatchers. Whether it is an instantaneous fault or a permanent fault, it can be determined whether the fault has actually occurred by whether there is a fault current in the intelligent terminal of the distribution network switch displayed by the master station.

[0047] According to the method of the present invention, during the fault judgment process from January to July 2022, the participation of the fault current excluded 334 cases of FA activation caused by mis-upload of fault information, helping the distribution dispatching personnel analyze 63 tripping accidents, and the accident judgment accuracy rate increased from 85.42% to 98.12%.

[0048] Through the implementation of a method for intelligent auxiliary fault judgment of the main station of distribution automation FA, the main station can call the current at the time of fault occurrence with one key for dispatchers to analyze. Whether it is an instantaneous fault or a permanent fault, it can be judged whether the fault actually occurs by whether there is fault current in the intelligent terminal of the distribution network switch displayed by the main station. The present invention provides a basis for fault judgment for distribution network dispatchers, improves the accuracy of fault judgment of the distribution network, improves the power supply reliability of the distribution network, and has high social benefits and popularization value.

[0049] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for intelligent auxiliary fault judgment of the main station FA in distribution automation, characterized in that, Based on the distribution automation system, the front-end system and the intelligent terminal as the basic environment, and perform the following steps: S1. The line sends a fault signal: The intelligent terminal transmits the fault signal generated by the collected distribution network line to the front-end system through the communication line; S2. Front-end system: The front-end system polls the distribution automation system, analyzes it, and then uploads the current value when the distribution network line fails to the distribution automation system; During the fault handling process, the fault current is included as an auxiliary condition in the FA fault judgment; S3. Distribution automation system: The distribution automation system starts the FA fault judgment module and sends a polling command to the intelligent terminal to obtain the real-time current value of the intelligent terminal; The polling is telemetry or tele-signaling; S4. Whether there is real-time current: During the processing of the FA fault judgment, when the polled real-time current value reaches the fault current, it is determined that the distribution network has a fault, and enter S5; when the polled real-time current value is in a normal state or does not reach the fault current value, it is determined that the distribution network has no fault, and enter S6; S5. Handle the fault: Perform scheduling and processing according to the fault handling process; S6. End.

2. The method for intelligent auxiliary distribution automation master station FA fault judgment according to claim 1, characterized in that, The intelligent terminal is a switch with network communication performance in the distribution network line.

3. The method for intelligent auxiliary distribution automation master station FA fault judgment according to claim 1, wherein, The front-end system is the client in the distribution network automation system.

4. A method for intelligent auxiliary fault judgment of the main station FA of distribution automation according to claim 1, characterized in that, The distribution automation system is the server in the distribution network automation system.

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