Electric power communication fault comprehensive diagnosis method

Abstract

The invention provides an electric power communication fault comprehensive diagnosis method, which comprises the following steps of: starting analysis through a failure table address; the module copying and reading module detects whether the module or the collector is damaged or not, multiple times of copying and reading are designed through a program, misjudgment is prevented, and the detection accuracy is guaranteed; signal diagnosis is carried out, whether noise interference exists in the field is judged, and through a series of processing such as FFT operation, power spectrum data processing and peak value detection, whether noise interference exists or not is finally judged, and a result is output; carrying out carrier sensing, carrying out the positioning of a transformer area island or string transformer area problem, and finally outputting a CCO address list, a neighborhood electric meter list, abnormal information and the like; and integrating and analyzing the information obtained in the steps 2-4, and finally outputting result information about whether the module or the electric meter is damaged, whether noise interference exists, whether the module or the electric meter is a transformer area island, whether the transformer area is connected and the like. According to the invention, the troubleshooting result of the module or collector damage problem, the environmental noise problem, the transformer area island problem and the cross transformer area problem can be visually displayed.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of power communication, and in particular to a comprehensive diagnosis method for power communication faults. Background Art

[0002] Smart grid is the intelligentization of power grid. It is built on the basis of high-speed two-way communication network. Through the application of sensing and measurement technology, advanced control methods, advanced equipment technology and advanced decision-making system, it realizes the goal of reliable, safe, economical, efficient and environmentally friendly power grid. The core connotation of smart grid is to realize the informatization, digitization, automation and interactivity of power grid.

[0003] As for fault location and analysis, current on-site analysis tools are unable to perform full-link fault analysis and diagnosis functions for low-voltage acquisition systems. In addition, due to the complexity of technical issues in the acquisition system, it is difficult to judge and characterize them using simple manual observations. The model that relies entirely on analysis by technical personnel is not only inefficient and unreliable, but also has many troubleshooting restrictions. Summary of the invention

[0004] The present invention mainly provides a comprehensive diagnosis method for power communication faults to solve the technical problems raised in the above background technology.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A comprehensive diagnosis method for power communication faults comprises the following steps:

[0007] Step 1: Start analysis by using the failure table address;

[0008] Step 2: Module reading to detect whether the module or collector is damaged. The program is designed to read multiple times to prevent misjudgment and ensure detection accuracy.

[0009] Step 3: Signal diagnosis, to determine whether there is noise interference on site, and finally output the result of whether there is noise interference through a series of processing such as FFT operation, power spectrum data processing, peak detection, etc.;

[0010] Step 4: Carrier sensing is used to locate the problem of isolated islands or cross-stations in the substation area, and finally output the CCO address list, neighboring meter list, abnormal information, etc.

[0011] Step 5: Integrate and analyze the information obtained from steps 2 to 4, and finally output the result information such as whether the module or meter is damaged, whether there is noise interference, whether it is an isolated island in the substation, whether it is a cross-substation, etc.

[0012] Furthermore, in step 2, detecting whether the module or collector is damaged specifically includes the following steps:

[0013] Step 1: Start reading by table number;

[0014] Step 2: The reader sends a beacon frame to start networking;

[0015] Step 3: The controller determines whether the target node is connected to the network. If it is connected to the network, it proceeds to step 4; otherwise, it proceeds to step 5.

[0016] Step 4: Read the electric meter in the network access mode, assemble the meter reading frame and send it, and then go to step 6;

[0017] Step 5: listen to the area network ID, organize and send the meter reading frame in the non-network mode, and enter step 6;

[0018] Step 6: Wait for the meter reading response and display the reading result after the reading is completed.

[0019] Furthermore, after the module reading function is started, the reading parameters are selected, and the corresponding commands are generated by the processor. The HPLC chip executes carrier transmission and reception, and returns the results to the processor. The processor stores the interactive message to the SD card, and finally displays the results on the screen.

[0020] Furthermore, in step 3, determining whether there is noise interference at the scene specifically includes the following steps:

[0021] Step 1: Click the Start button to start the analysis;

[0022] Step 2, ADC sampling of the power line signal;

[0023] Step 3: FFT operation and processing to obtain the frequency domain information of the interference signal. This system performs FFT operation and processing through software operation. To ensure the operation performance, parameters such as the butterfly factor are obtained through table lookup method.

[0024] Step 4: The frequency domain data processing unit processes and identifies the frequency domain data obtained by the FFT operation, and processes the frequency domain data through methods such as cyclic sampling, maximum hold, power spectrum accumulation, and peak detection, so that the power line environmental noise information processing results are more accurate.

[0025] Furthermore, when ADC sampling is performed on the power line signal, four communication frequency bands are defined in the HPLC communication technical specification. The frequency band of the measured signal ranges from 0.7MHz to 12MHz. According to the sampling theorem, the sampling frequency should be greater than 24MHz. This system uses a 25MHz sampling frequency to sample the noise signal. The HPLC communication technical specification stipulates that the subcarrier interval used in communication is 24.414KHz. In order to ensure accurate evaluation of the impact of noise on HPLC communication, the minimum number of sampling points is 1024 points. The number of single sampling points involved in this system is 2048, and the corresponding spectrum resolution is 12.207KHz.

[0026] Furthermore, the step three of locating the problem of isolated island or inter-station area specifically includes the following steps:

[0027] Step 1: Select the frequency band and start listening;

[0028] Step 2: The message interception module completes the preliminary interception and analysis of the carrier message and stores the original message in the SD card;

[0029] Step 3: Message processing is performed through beacon processing and management message frame processing;

[0030] Step 4: The result output unit displays the processing results, such as the CCO address list, the neighborhood meter list, abnormal information, etc., through which the island problem or the cross-station problem can be located;

[0031] Furthermore, during the message processing, beacon processing and management message frame processing are used. Beacon processing processes the received central beacon frames, proxy beacon frames and discovery beacon frames, and obtains a list of nearby CCO addresses and a list of nearby electric meters through beacon frame processing, which can be used to troubleshoot problems such as islanding or stringing of substations. Management message frame processing mainly processes network access request frames and network access request response frames, and gives prompts when abnormalities are detected.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The present invention integrates the three functions of module reading, signal diagnosis, impedance analysis, and carrier sensing, and reasonably designs the execution process. On-site users only need to connect the equipment and specify the target meter to start comprehensive analysis and generate a problem list, which intuitively displays the results of troubleshooting problems such as module or collector damage, environmental noise, island problems, and cross-station problems. This function is specially designed for on-site problem troubleshooting, and only one application is needed to locate meter-end problems.

[0034] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a comprehensive diagnosis flow chart of the present invention;

[0036] Figure 2 The module reading flow chart of the present invention;

[0037] Figure 3 It is a carrier sensing flow chart of the present invention;

[0038] Figure 4 is a flow chart of channel analysis of the present invention;

[0039] Figure 5 It is a signal diagnosis flow chart of the present invention. DETAILED DESCRIPTION

[0040] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0041] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0043] Example 1

[0044] Please refer to the attached Figure 1-4 , a comprehensive diagnosis method for power communication faults, comprising the following steps:

[0045] Step 1: Start analysis by using the failure table address;

[0046] Step 2: Module reading to detect whether the module or collector is damaged. The program is designed to read multiple times to prevent misjudgment and ensure detection accuracy.

[0047] Step 3: Signal diagnosis, to determine whether there is noise interference on site, and finally output the result of whether there is noise interference through a series of processing such as FFT operation, power spectrum data processing, peak detection, etc.;

[0048] Step 4: Carrier sensing is used to locate the problem of isolated islands or cross-stations in the substation area, and finally output the CCO address list, neighboring meter list, abnormal information, etc.

[0049] Step 5: Integrate and analyze the information obtained from steps 2 to 4, and finally output the result information such as whether the module or meter is damaged, whether there is noise interference, whether it is an isolated island in the substation, whether it is a cross-substation, etc.

[0050] Furthermore, in step 2, detecting whether the module or collector is damaged specifically includes the following steps:

[0051] Step 1: Start reading by table number;

[0052] Step 2: The reader sends a beacon frame to start networking;

[0053] Step 3: The controller determines whether the target node is connected to the network. If it is connected to the network, it proceeds to step 4; otherwise, it proceeds to step 5.

[0054] Step 4: Read the electric meter in the network access mode, assemble the meter reading frame and send it, and then go to step 6;

[0055] Step 5: listen to the area network ID, organize and send the meter reading frame in the non-network mode, and enter step 6;

[0056] Step 6: Wait for the meter reading response and display the reading result after the reading is completed.

[0057] Furthermore, after the module reading function is started, the reading parameters are selected, and the corresponding commands are generated by the processor. The HPLC chip executes carrier transmission and reception, and returns the results to the processor. The processor stores the interactive message to the SD card, and finally displays the results on the screen.

[0058] Furthermore, in step 3, determining whether there is noise interference at the scene specifically includes the following steps:

[0059] Step 1: Click the Start button to start the analysis;

[0060] Step 2, ADC sampling of the power line signal;

[0061] Step 3: FFT operation and processing to obtain the frequency domain information of the interference signal. This system performs FFT operation and processing through software operation. To ensure the operation performance, parameters such as the butterfly factor are obtained through table lookup method.

[0062] Step 4: The frequency domain data processing unit processes and identifies the frequency domain data obtained by the FFT operation, and processes the frequency domain data through methods such as cyclic sampling, maximum hold, power spectrum accumulation, and peak detection, so that the power line environmental noise information processing results are more accurate.

[0063] Furthermore, when ADC sampling is performed on the power line signal, four communication frequency bands are defined in the HPLC communication technical specification. The frequency band of the measured signal ranges from 0.7MHz to 12MHz. According to the sampling theorem, the sampling frequency should be greater than 24MHz. This system uses a 25MHz sampling frequency to sample the noise signal. The HPLC communication technical specification stipulates that the subcarrier interval used in communication is 24.414KHz. In order to ensure accurate evaluation of the impact of noise on HPLC communication, the minimum number of sampling points is 1024 points. The number of single sampling points involved in this system is 2048, and the corresponding spectrum resolution is 12.207KHz.

[0064] Furthermore, the step three of locating the problem of isolated island or inter-station area specifically includes the following steps:

[0065] Step 1: Select the frequency band and start listening;

[0066] Step 2: The message interception module completes the preliminary interception and analysis of the carrier message and stores the original message in the SD card;

[0067] Step 3: Message processing is performed through beacon processing and management message frame processing;

[0068] Step 4: The result output unit displays the processing results, such as the CCO address list, the neighborhood meter list, abnormal information, etc., through which the island problem or the cross-station problem can be located;

[0069] Furthermore, during the message processing, beacon processing and management message frame processing are used. Beacon processing processes the received central beacon frames, proxy beacon frames and discovery beacon frames, and obtains a list of nearby CCO addresses and a list of nearby electric meters through beacon frame processing, which can be used to troubleshoot problems such as islanding or stringing of substations. Management message frame processing mainly processes network access request frames and network access request response frames, and gives prompts when abnormalities are detected.

[0070] Example 2

[0071] A comprehensive diagnosis method for power communication faults comprises the following steps:

[0072] Sp1, start the application, enter the failure table address, and start analysis.

[0073] Sp2, module reading is used to detect whether the module or collector is damaged. The program is designed with multiple readings to prevent misjudgment and ensure detection accuracy.

[0074] Sp3, signal diagnosis is used to determine whether there is noise interference on site. Through a series of processing such as FFT operation, power spectrum data processing, peak detection, etc., the output result of whether there is noise interference is finally obtained.

[0075] Sp4, carrier sensing is used to locate isolated islands or cross-station problems in the substation area. This function ultimately outputs a CCO address list, a neighboring meter list, abnormal information, etc.

[0076] Sp5, comprehensive diagnosis integrates and analyzes the above information, and finally outputs the result information such as whether the module or meter is damaged, whether there is noise interference, whether it is an isolated island in the substation, whether it is a cross-station, etc.

[0077] Furthermore, the comprehensive diagnosis function integrates the three functions of module reading, signal diagnosis, impedance analysis, and carrier sensing, and reasonably designs the execution process. On-site users only need to connect the equipment and specify the target meter to start the comprehensive analysis and generate a problem list, which intuitively displays the results of the troubleshooting of module or collector damage, environmental noise, island problems, and cross-station problems. This function is specially designed for on-site problem troubleshooting, and only one application is needed to locate meter-side problems.

[0078] Further, the module copying process is as follows:

[0079] Sp1, start the application, enter the meter number to start reading.

[0080] Sp2, the reader sends a beacon frame to start networking.

[0081] Sp3, the controller determines whether the target node is connected to the network. If so, it enters Sp4, otherwise it enters Sp5.

[0082] Sp4, read the electric meter in network access mode, assemble the meter reading frame and send it, and enter Sp6.

[0083] Sp5, listens to the network ID of the substation area, organizes and sends the meter reading frame in the non-network mode, and enters Sp6.

[0084] Sp6, waiting for the meter reading response, and displaying the reading result after the reading is completed;

[0085] The module reading function is designed to locate module or collector damage. This function can be used to determine whether a module or collector is damaged. The product should be able to adaptively and be compatible with all HPLC scheme modules or collectors. By reading the meter on site, it can be verified whether the module or collector is damaged. The function is simple to operate and the results are clear.

[0086] After the function is started, the reading parameters are selected, the processor generates the corresponding commands, the HPLC chip executes carrier transmission and reception, and returns the results to the processor, the processor stores the interactive message to the SD card, and displays the results on the screen. The module reading implementation process is shown in the figure below. The tool has a networking function. For the offline modules in the field area, the networking reading function can be realized. For the modules in the field area that have been connected to the network, the network ID can be listened to and the module reading can be performed using the network ID.

[0087] Furthermore, the carrier sensing process is shown in the following figure:

[0088] Sp1, start the application, select the frequency band, and start listening.

[0089] Sp2, the message interception module completes the preliminary interception and analysis of the carrier message and stores the original message in the SD card.

[0090] Sp3, the message processing flow is divided into two parts: beacon processing and management message frame processing. Beacon processing processes the received central beacon frames, proxy beacon frames, and discovery beacon frames. Through beacon frame processing, the list of nearby CCO addresses and nearby electric meters is obtained, which can be used to troubleshoot problems in isolated areas or cross-area areas. Management message frame processing mainly processes network access request frames and network access request response frames, and prompts when abnormalities are detected.

[0091] Sp4, the result output unit displays the processing results, such as the CCO address list, the neighborhood meter list, abnormal information, etc., through which the island problem or the cross-station problem can be located;

[0092] The carrier listening function is designed to address problems such as meter defects, islanding, and cross-station problems. By listening to the carrier communication message at the meter end, the problem at the end of the station collection link can be located. This function analyzes the message and presents the problem location results in a list.

[0093] Furthermore, the signal diagnosis process flow is as follows:

[0094] Sp1, start the application and click the Start button to start the analysis.

[0095] Sp2, ADC samples the power line signal. The HPLC communication technical specification defines four communication frequency bands, as shown in Table 1-1. The measured signal frequency band ranges from 0.7MHz to 12MHz. According to the sampling theorem, the sampling frequency should be greater than 24MHz. This system uses a 25MHz sampling frequency to sample the noise signal. The HPLC communication technical specification stipulates that the subcarrier interval used in communication is 24.414KHz. In order to ensure accurate evaluation of the impact of noise on HPLC communication, the minimum number of sampling points is 1024 points. The number of single sampling points involved in this system is 2048, and the corresponding spectrum resolution is 12.207KHz.

[0096] Sp3, FFT operation processing, obtains the frequency domain information of the interference signal. This system performs FFT operation processing through software operation. To ensure the operation performance, parameters such as the butterfly factor are obtained through table lookup method.

[0097] Sp4, the frequency domain data processing unit processes and identifies the frequency domain data obtained by FFT operation, and processes the frequency domain data through methods such as cyclic sampling, maximum hold, power spectrum accumulation, and peak detection, so that the power line environmental noise information processing result is more accurate;

[0098] The signal diagnosis function is designed to address environmental noise issues. This function can measure environmental noise and locate the noise source. The device displays the measurement results in a graphical form and indicates whether the environmental noise is too loud. At the same time, it records noise and interference data to provide a data basis for laboratory simulation and tracing back to the on-site interference environment.

[0099] The signal diagnosis application collects power line environmental noise and wireless electromagnetic interference noise, analyzes the time-varying characteristics, amplitude-frequency characteristics, noise change laws, etc., and generates on-site substation noise intensity results.

[0100] Table 1-1 Communication frequency bands

[0101]

[0102] Furthermore, the signal transmission process is as follows:

[0103] Sp1, start the application and click the start launch button.

[0104] Sp2, encodes the test data information.

[0105] Sp3, perform IFFT operation based on the encoding result to generate a time domain discrete signal.

[0106] Sp4, sends test signals through DA conversion chip and PA chip.

[0107] Sp5, repeat steps Sp2 to Sp4 according to a fixed cycle;

[0108] The signal analysis function is designed for in-depth research on power line communication theory, realizing the analysis of low-voltage power line impedance characteristics and providing basic data for low-voltage power line channel research.

[0109] Furthermore, the signal receiving process is as follows:

[0110] Sp1, start the application and click the Start button to start the analysis.

[0111] Sp2, high speed ADC sampling.

[0112] Sp3, perform FFT operation on the sampled data to obtain frequency domain information.

[0113] Sp4, processes frequency domain data and extracts environmental noise information and transmitted signal information.

[0114] Sp5, information decoding, analyzes the power line channel impedance information.

[0115] The above is an exemplary description of the present invention in combination with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A comprehensive diagnosis method for power communication faults, characterized in that: The following steps are involved: Step 1: Start analysis by using the failure table address; Step 2: Module reading to detect whether the module or collector is damaged. The program is designed to read multiple times to prevent misjudgment and ensure detection accuracy. Step 3: Signal diagnosis, to determine whether there is noise interference on site, and finally output the result of whether there is noise interference through a series of processing such as FFT operation, power spectrum data processing, peak detection, etc.; Step 4: Carrier sensing is used to locate the problem of isolated islands or cross-stations in the substation area, and finally output the CCO address list, neighboring meter list, abnormal information, etc. Step 5: Integrate and analyze the information obtained from steps 2 to 4, and finally output the result information such as whether the module or meter is damaged, whether there is noise interference, whether it is an isolated island in the substation, whether it is a cross-substation, etc.

2. A comprehensive diagnosis method for power communication faults according to claim 1, characterized in that: In step 2, detecting whether the module or collector is damaged specifically includes the following steps: Step 1: Start reading by table number; Step 2: The reader sends a beacon frame to start networking; Step 3: The controller determines whether the target node is connected to the network. If it is connected to the network, it proceeds to step 4; otherwise, it proceeds to step 5. Step 4: Read the electric meter in the network access mode, assemble the meter reading frame and send it, and then go to step 6; Step 5: listen to the area network ID, organize and send the meter reading frame in the non-network mode, and enter step 6; Step 6: Wait for the meter reading response and display the reading result after the reading is completed.

3. A comprehensive diagnosis method for power communication faults according to claim 1, characterized in that: After the module reading function is started, the reading parameters are selected, and the corresponding commands are generated by the processor. The HPLC chip executes carrier transmission and reception and returns the results to the processor. The processor stores the interactive message to the SD card and finally displays the results on the screen.

4. A comprehensive diagnosis method for power communication faults according to claim 1, characterized in that: In step 3, determining whether there is noise interference at the scene specifically includes the following steps: Step 1: Click the Start button to start the analysis; Step 2, ADC sampling of the power line signal; Step 3: FFT operation and processing to obtain the frequency domain information of the interference signal. This system performs FFT operation and processing through software operation. To ensure the operation performance, parameters such as the butterfly factor are obtained through table lookup method. Step 4: The frequency domain data processing unit processes and identifies the frequency domain data obtained by the FFT operation, and processes the frequency domain data through methods such as cyclic sampling, maximum hold, power spectrum accumulation, and peak detection, so that the power line environmental noise information processing results are more accurate.

5. A comprehensive diagnosis method for power communication faults according to claim 1, characterized in that: When ADC sampling is performed on the power line signal, the frequency band of the measured signal is in the range of 0.7MHz to 12MHz, and the noise signal is sampled at a sampling frequency of 25MHz; the number of single sampling points involved is 2048, and the corresponding spectrum resolution is 12.207KHz.

6. A comprehensive diagnosis method for power communication faults according to claim 1, characterized in that: The step three of locating the problem of isolated island or inter-station area specifically includes the following steps: Step 1: Select the frequency band and start listening; Step 2: The message interception module completes the preliminary interception and analysis of the carrier message and stores the original message in the SD card; Step 3: Message processing is performed through beacon processing and management message frame processing; Step 4: The result output unit displays the processing results, such as the CCO address list, the neighborhood meter list, abnormal information, etc. This information can be used to locate the island problem or the cross-station problem in the substation area.

7. A comprehensive diagnosis method for power communication faults according to claim 1, characterized in that: The beacon processing and management message frame processing are used to process the message. The beacon processing processes the received central beacon frame, proxy beacon frame, and discovery beacon frame. The beacon frame processing obtains the nearby CCO address list and nearby meter list, which can be used to troubleshoot the island problem or the cross-station problem in the substation area. Management message frame processing mainly processes network access request frames and network access request response frames, and prompts are given when abnormalities are monitored.

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