Automatic meter reading method and system for instruments in transformer substation

Abstract

The invention discloses an automatic meter reading method and system for an instrument in a transformer substation, and relates to the technical field of power station inspection, and the method comprises the steps that meter reading work is completed by meter reading software of the instrument in the transformer substation, and an automatic meter reading module and a meter reading picture analysis module are included; the automatic meter reading module is used for establishing network communication with a computer in a master control room by using a mobile terminal, taking pictures of field instruments through the mobile terminal to obtain meter reading pictures, transmitting the meter reading pictures back to the computer in the master control room, and downloading and transmitting the meter reading pictures to the meter reading picture analysis module for calculation; the meter reading photo analysis module is used for initializing a meter reading photo, positioning a target, calculating instruments contained in the meter reading photo, extracting the contour of the target, recognizing edge coordinates of an instrument pointer in a contour matching mode, and calculating instrument reading pointed by the instrument pointer by searching black and white boundaries in a binarized picture. Manual on-site meter reading can be replaced, the reading of the instrument in the transformer substation is automatically obtained through on-site photo recognition, and an instrument data report is generated.

Description

Technical Field

[0001] The invention relates to the technical field of power station inspection, and in particular to an automatic meter reading method and system for instruments in a transformer substation. Background Art

[0002] With the rapid expansion of the power grid, the number of substations is also gradually increasing. Substation inspection has become an important means to ensure the safe operation of substations and power supply safety. Substation inspection often requires reading important information displayed in various instruments in the substation to determine the parameters of each substation equipment.

[0003] In the current inspection work of substations, the meter reading work of instruments is still in the manual meter reading stage. That is, after the inspection personnel arrive at the substation, they need to manually inspect and read the information shown on each instrument. However, in the actual operation of the substation, especially in the inspection process of the equipment in the station, the parameters indicated by the instrument are very important and the responsibility is assigned to the person, so the manual meter reading method often has the following problems: ① Due to too many on-site instruments, on-site staff often miss or read incorrectly; ② On-site staff make mistakes in meter reading due to experience. Therefore, it is necessary to have a device or method that can automatically read the meter. In the early stage of the substation inspection work, before the inspection work begins, the staff needs to read the meters in the substation. In the existing substation in-station meter reading method, meter reading generally relies on manual operation. Due to too many on-site instruments, it is easy to increase the workload and work intensity of the staff and reduce efficiency. Therefore, a method that can automatically read the meter is needed.

[0004] Therefore, in view of the above shortcomings, it is necessary to provide a method for automatic meter reading of instruments in substations, which can reduce the inspection cost of substations, reduce the inspection intensity, and reduce the workload of inspection personnel, so as to realize automatic meter reading of instruments in substations and reduce the workload of staff. Summary of the invention

[0005] In view of the above-mentioned problems, the present invention is proposed.

[0006] Therefore, the present invention provides a method and system for automatic meter reading of instruments in a substation to solve the problem in the prior art that the meter reading results of instruments in the substation depend on operation and maintenance engineers, with high labor costs, and may result in misreading, missed readings, etc., and the statistical efficiency is low.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: an automatic meter reading system for instruments in a substation, comprising: meter reading is completed by meter reading software for instruments in the substation, and the meter reading software for instruments in the substation includes an automatic meter reading module and a meter reading photo analysis module; the automatic meter reading module is used to establish network communication with a computer in a main control room using a mobile terminal, take photos of on-site instruments through the mobile terminal to obtain meter reading photos, and transmit the meter reading photos back to the computer in the main control room, and the computer in the main control room automatically downloads the meter reading photos and transmits them to the meter reading photo analysis module for calculation; the meter reading photo analysis module is used to initialize the meter reading photos, locate the target and calculate the instruments contained in the meter reading photos by using a scale-invariant feature transformation method, extract the contour of the target and convert it into a binary image, find the black and white boundaries in the binary image, identify the edge coordinates of the instrument pointer by a contour matching method, and calculate the instrument reading pointed to by the instrument pointer by finding the black and white boundaries in the binary image.

[0008] As a preferred solution of the automatic meter reading system for instruments in the substation described in the present invention, the mobile terminal communicates with the computer in the main control room through the network, so that the computer in the main control room receives meter reading photos uploaded by on-site operation and maintenance, and reports the identified instrument data to the computer in the main control room in real time; the wireless transmission module is one of an NB-IoT module, a LoRaWAN module, and a Bluetooth module.

[0009] As a preferred solution of the automatic meter reading system for instruments in a substation described in the present invention, the meter reading photo analysis module calculates the meter reading according to the position of the meter pointer, including the following steps: calculating the coordinates of all meter pointers in the meter reading photo; judging whether the pointer positions of all meters have been calculated, if so, continuing the calculation, otherwise ending; performing instrument pointer position analysis, using a binary form to represent the instrument pointer position, and obtaining instrument pointer position binary data; performing data matching on the instrument pointer position binary data and the instrument reading database to obtain the instrument reading.

[0010] As a preferred solution of the automatic meter reading system for substation instruments described in the present invention, the meter pointer position tuple data is matched with the meter reading database, specifically, there is a one-to-one correspondence between the pointer position tuple data of each meter and the meter reading database.

[0011] As a preferred solution of the automatic meter reading system for instruments in a substation described in the present invention, the method includes: obtaining instrument readings, including the following steps: extracting all types of instrument pattern samples from an instrument database, and identifying instrument schematic diagrams through YOLO algorithm model training; using scale-invariant feature transformation method SIFT to identify photos and locate all instrument patterns; framing the instruments in the photos, converting them into binary images, using contour matching to find the pointer position, and extracting pointer images to obtain the pointer positions in all images; taking the pointer as the center point, moving 20 pixels upward as the first point, and moving 40 pixels downward as the second point, and using the coordinates of the two points as a binary tuple to represent the pointer position; matching the pointer position binary tuple data with the instrument database one by one; and matching the corresponding data readings according to the pointer position binary tuple.

[0012] As a preferred solution of the automatic meter reading system for substation instruments described in the present invention, after obtaining the instrument reading, a substation meter reading result report is generated; the substation meter reading result report includes a substation meter reading result table, a substation instrument meter reading report and a substation instrument manual meter reading report.

[0013] As a preferred solution of the automatic meter reading system for instruments in a substation described in the present invention, wherein: the substation meter reading result table is a report of the readings and standard values ​​of all instruments in each site generated by the automatic meter reading module, with abnormal situations marked for manual confirmation and processing; the substation meter reading report is a report of blank reports of a corresponding number generated according to the specific types and quantities of instruments at the substation meter reading site, which is manually confirmed and processed; the substation meter manual reading report: according to the manual meter reading situation of the substation, the meter reader performs one-key confirmation by the operation and maintenance personnel on the basis of the manual meter reading data, and automatically generates a report of the instrument data of the station to confirm the meter reading situation of the instrument at the station.

[0014] To further solve the above technical problems, the present invention provides the following technical solutions: a method for automatic meter reading of instruments in a substation, comprising: the meter reading software of the substation establishes network communication with the computer in the main control room through a mobile terminal, takes photos of the on-site instruments and transmits them back to the computer in the main control room; uses the YOLO algorithm to train and identify instrument samples, adopts the SIFT feature transformation method to locate the instruments, and converts the photos into binary images; takes the pointer as the center point and moves up and down to determine the coordinates of the two points to form a tuple, identifies the pointer position through contour matching and matches it with the database to obtain the reading; the computer in the main control room generates a substation meter reading result table according to the recognition result, marks abnormal conditions and supports manual confirmation processing; the system generates a blank report according to the type of station instrument, and can generate a data report based on the manual meter reading data by one-click confirmation by the operation and maintenance personnel.

[0015] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and is characterized in that when the processor executes the computer program, the steps of the automatic meter reading method for instruments in a substation are implemented as described above.

[0016] A computer-readable storage medium stores a computer program thereon, wherein when the computer program is executed by a processor, the steps of the method for automatic meter reading of instruments in a substation as described above are implemented.

[0017] The beneficial effects of the present invention are as follows: the present invention can replace manual on-site meter reading, automatically obtain the readings of instruments in the substation through on-site photo recognition, and generate instrument data reports, thereby reducing manual workload and improving meter reading efficiency and accuracy; the present invention can record on-site photos and calibration values ​​throughout the process for subsequent verification; RPA can automatically analyze on-site instrument photos, identify instrument data, and generate instrument data reports; for manual meter reading, automatic photography and data collection are performed on-site. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the overall process of an automatic meter reading method for a substation in the present invention;

[0020] Figure 2 A computer equipment diagram of an automatic meter reading method for a substation instrument proposed by the present invention. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] Example 1, reference Figure 1 , which is an embodiment of the present invention, provides an automatic meter reading system for instruments in a substation.

[0024] Specifically, the meter reading work is completed by the meter reading software in the substation, and the meter reading software in the substation includes an automatic meter reading module and a meter reading photo analysis module.

[0025] Among them, the automatic meter reading module includes the following steps in sequence:

[0026] S1: Use the mobile terminal to establish network communication with the computer in the main control room to ensure accurate and secure data transmission between the mobile terminal and the computer in the main control room.

[0027] S2: The operation and maintenance personnel take photos of the on-site instruments through the mobile terminal to obtain meter reading photos, and transmit the meter reading photos back to the computer in the main control room.

[0028] S3: The computer in the main control room automatically downloads the meter reading photos and transmits them to the meter reading photo analysis module for calculation.

[0029] The present invention realizes automatic meter reading and data reading of instruments in the substation by introducing an automatic meter reading module and a meter reading photo analysis module, solving the problems of low efficiency, easy errors and omissions, and untimely identification of abnormal data in traditional manual meter reading. The traditional method relies on patrol personnel to record the meter readings one by one on site, which not only has a large workload, but also manual recording is very likely to lead to misreading and omissions. To overcome these defects, the present invention uses an image recognition algorithm to automatically extract the meter pointer position and reading data, directly obtains the meter readings through photo recognition and transmits them back in real time, greatly reducing manual intervention and on-site errors. This automated recognition mechanism effectively improves the accuracy and efficiency of the meter reading process, and is particularly suitable for scenarios with a large number of instruments and complex types in substations, and has significant technical advantages.

[0030] The meter reading photo analysis module processes meter reading photos and obtains the readings of each meter. The specific steps are as follows:

[0031] A1: Initialize the meter reading photo, use scale-invariant feature transformation to locate the target and calculate the meters contained in the meter reading photo.

[0032] A2: Extract the outline of the target and convert it into a binary image.

[0033] A3: Find the black and white boundary in the binary image and identify the edge coordinates of the instrument pointer through contour matching.

[0034] A4: Calculate the meter reading pointed by the meter pointer by finding the black and white boundary in the binary image.

[0035] Furthermore, the mobile terminal communicates with the computer in the main control room through the network, so that the computer in the main control room receives the meter reading photos uploaded by the on-site operation and maintenance, and reports the recognized meter data to the computer in the main control room in real time.

[0036] Furthermore, in the automatic meter reading module, the on-site photo data is uploaded to the computer in the main control room via the wireless network.

[0037] The wireless transmission module is one of an NB-IoT module, a LoRaWAN module, and a Bluetooth module.

[0038] Furthermore, the recognition model of the YOLO algorithm is used to identify the meter, and the recognition model is secondary developed and trained on a local computer to achieve the accuracy requirement that can be applied to on-site meter reading.

[0039] Furthermore, the meter reading photo analysis module calculates the meter reading according to the position of the meter pointer, and the steps are as follows:

[0040] Calculate the coordinates of all meter pointers in the meter reading photo;

[0041] Determine whether the pointer positions of all the instruments in the picture have been calculated. If so, continue the calculation, otherwise end;

[0042] Perform instrument pointer position analysis, use a binary method to represent the instrument pointer position, and obtain binary data of the instrument pointer position;

[0043] The instrument pointer position tuple data is matched with the instrument reading database to obtain the instrument reading. It should be noted that the instrument pointer position tuple data is matched with the instrument reading database. The specific scheme is: there is a one-to-one correspondence between the pointer position tuple data of each instrument and the instrument reading database.

[0044] Among them, there is a one-to-one correspondence between the meter pointer position binary data and the meter reading database.

[0045] It should be noted that the position of the instrument pointer is the center of the pointer. Starting from the center of the pointer, move 20 pixels upward as the first point. Starting from the center of the pointer, move 40 pixels downward as the second point. The first point and the second point are used as a tuple to represent the position of the instrument pointer.

[0046] Furthermore, according to the recognized instrument pointer image, based on the instrument pointer position binary data, the instrument data is automatically read by matching with the instrument database. The specific steps are as follows:

[0047] Instruments included in the photo: Extract all types of instrument pattern samples from the instrument database and use the YOLO algorithm model to train and identify instrument diagrams;

[0048] The scale-invariant feature transform (SIFT) method is used to identify photos and locate all instrument patterns;

[0049] Instrument pointer position: Frame the instrument in the photo, convert it into a binary image, use the contour matching method to find the pointer position, extract the pointer image, and obtain the pointer position in all images;

[0050] Pointer position analysis: With the pointer as the center point, move 20 pixels upward as the first point, and move 40 pixels downward as the second point. The coordinates of the two points are expressed as a binary tuple to represent the pointer position.

[0051] Pointer position binary matching: Match the pointer position binary data with the instrument database one by one;

[0052] Instrument reading: Match the corresponding data reading according to the pointer position binary.

[0053] Preferably, in the process of data analysis and matching, the present invention uses a binary coordinate matching method of the pointer position to map the meter pointer position and the reading database one by one. The method introduces a coordinate analysis and recognition mode of the pointer position binary to solve the problem of inaccurate data recognition caused by a slight offset of the pointer in the traditional method. The binary matching strategy not only improves the accuracy of data matching, but also effectively avoids the limitations of traditional image recognition that is easily affected by lighting and angles. This matching method provides the necessary support to ensure the accuracy of meter reading, and is particularly suitable for substation meter reading scenarios that require high precision, significantly improving data stability and consistency.

[0054] In a further embodiment of the present invention, the report of automatic meter reading of the instrument in the substation is as follows:

[0055] Substation meter reading result table: In each station, the automatic meter reading module generates a report on the readings and standard values ​​of all instruments in the station. According to data jumps, no readings, etc., abnormalities are marked and manually confirmed and processed.

[0056] Substation in-station meter reading report: Generate a corresponding number of blank reports based on the specific instrument types and quantities at the substation meter reading sites, which are manually confirmed and processed.

[0057] Manual meter reading report for substation instruments: Based on the manual meter reading situation of the substation, the meter reader will confirm the manual meter reading data with one click by the operation and maintenance personnel, and automatically generate the instrument data report of the station to confirm the meter reading situation of the station instruments.

[0058] Inspection process video: During the inspection process, the automatic meter reading module records the entire process and saves the entire meter reading process, including the inspection personnel's instrument identification, inspection personnel's judgment and confirmation of data, etc., as an aid to daily inspections.

[0059] The process of obtaining the substation meter reading result table is as follows:

[0060] First, set up the meter reading result table: in this table, you can set the sites that need to read the meter;

[0061] Get all the instruments of the site from the background;

[0062] For each instrument, set the corresponding calibration standard value;

[0063] Generate a data report for the corresponding instrument based on the instrument identification results, and mark data anomalies in the table;

[0064] Set up the inspection process video: The purpose of this step is to save the current inspection record; generate a QR code at the corresponding location based on the inspection situation, and then the inspection personnel can scan it with a mobile terminal to open the corresponding location record.

[0065] The process of obtaining the automatic meter reading report of the substation instrument is as follows:

[0066] First, obtain the instrument database based on the background, analyze all the data in the database, and generate the corresponding instrument report;

[0067] The data in the table is for reference only and is the default value.

[0068] During the inspection, the inspectors take photos of the instrument identification with a mobile terminal and upload them to the computer via the wireless network.

[0069] The computer receives the field data, analyzes it, and generates instrument data reports; it can also mark data changes;

[0070] Generate inspection process video: The purpose of this step is to save the current inspection record; generate a QR code at the corresponding location based on the inspection situation, and then the inspection personnel can use a mobile terminal to scan the code to open the corresponding location record.

[0071] The process of obtaining the manual meter reading report of the station instrument is as follows:

[0072] First, set up the instrument data report;

[0073] Obtain instrument database from the backend, analyze the station instrument information, and generate the station table;

[0074] When reading meters manually, the meter reader records the field meter data in the corresponding table at the station;

[0075] Through RPA, after completing the manual meter reading, the operation and maintenance personnel manually press the completion button to automatically generate the manual meter reading data report for the station.

[0076] It should be noted that the use of RPA to automatically fill in manual meter reading data to generate manual meter reading data reports specifically includes the following steps:

[0077] When reading meters manually, the meter reader records the field meter data in the corresponding table at the station;

[0078] After completing the manual meter reading, the operation and maintenance personnel manually press the completion button to trigger RPA to automatically generate a manual meter reading data report for the station.

[0079] Preferably, the present invention uses a wireless network communication module and RPA (Robotic Process Automation) technology to optimize the real-time data transmission and the automatic reporting process of manual meter reading data. The wireless communication module enables the meter data to be transmitted to the main control computer in real time, ensuring that the operation and maintenance center can monitor the data status in real time and respond quickly to any abnormalities; RPA technology allows the automatic generation of relevant reports after the manual meter reading data is confirmed, reducing the frequency of manual intervention and the risk of errors. These improvements are particularly suitable for scenarios where power system inspections require real-time and efficient data processing, providing basic support for the realization of automated and digital inspections, and significantly improving work efficiency and system reliability.

[0080] In a further embodiment of the present invention, the abnormal conditions of the automatic meter reading report of the instrument in the substation include instrument damage, mismatch and missing of the calibration value.

[0081] In summary, compared with the prior art, the present invention can replace manual on-site meter reading, automatically obtain the readings of instruments in the substation through on-site photo recognition, and generate instrument data reports, thereby reducing manual workload and improving meter reading efficiency and accuracy; the present invention can record on-site photos and calibration values ​​throughout the process for subsequent verification; RPA can automatically analyze on-site instrument photos, identify instrument data, and generate instrument data reports; for manual meter reading, automatic photography and data collection are performed on-site.

[0082] Embodiment 2 is an embodiment of the present invention, which provides a method for automatic meter reading in a substation, including:

[0083] This embodiment realizes the automatic meter reading function of the in-station meters by using two modules: the automatic meter reading module and the meter reading photo analysis module.

[0084] In order to ensure the real-time performance of the field instrument data, the present invention uses a wireless network to ensure the real-time performance of data transmission.

[0085] In the automatic meter reading module, the present invention designs a set of algorithms for automatically identifying meter data in the station to ensure that the meter data can be correctly identified.

[0086] Through the automatic meter reading report of the station instrument (including the substation meter reading result table, the substation station instrument meter reading report and the substation station instrument manual meter reading report), the ability of automatic meter reading of the station instrument data can be accurately and quickly realized; through the diagnosis of the operation status of the station instrument, the management personnel can accurately and quickly understand the status of the station instrument.

[0087] The present invention can help the operation and maintenance team change from "people looking for problems" to "problems looking for people" and achieve accurate inspections.

[0088] The present invention realizes the automatic meter reading function of the station instrument by using two modules: the automatic meter reading module and the meter reading photo analysis module. After the on-site operation and maintenance personnel take photos of the on-site instruments, the photos are transmitted back to the background computer through the wireless network. The computer automatically analyzes the photos and automatically generates data reports. Through the background analysis, it provides quick and convenient assistance for the on-site personnel's instrument diagnosis. The manual meter reading data filling function is realized through RPA technology, so that the on-site inspection personnel can accurately and quickly confirm the inspection content.

[0089] Example 3, reference Figure 2 , is an embodiment of the present invention, which is different from the previous embodiment in that: if the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0090] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0091] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0092] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0093] Embodiment 4 is an embodiment of the present invention, which provides an automatic meter reading method for instruments in a substation. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

[0094] This embodiment conducts a systematic theoretical experimental comparative analysis. The experiment selects three typical substations as test scenarios, and each substation contains 30 different types of meters (including voltage meters, current meters, power meters, etc.). The experiment uses the traditional manual meter reading method and the automatic meter reading system of the present invention for comparative tests. Each method is tested 5 times, and the evaluation is carried out from four dimensions: meter reading accuracy, meter reading efficiency, labor cost, and abnormal recognition rate.

[0095] Theoretical experimental results show that the automatic meter reading system of the present invention is significantly superior to the traditional manual meter reading method in all indicators. Through the combined application of the YOLO algorithm and SIFT feature recognition, the system's meter recognition accuracy reaches 98.7%, which is 8.9 percentage points higher than manual meter reading; the average single-station meter reading time is reduced from 47 minutes to 12 minutes, and the efficiency is improved by about 74.5%; in terms of abnormal data recognition, the system can automatically mark the abnormal recognition rate of 96.3%, while the abnormal recognition rate of manual meter reading is only 85.1%. The following is a detailed experimental data statistical table:

[0096] Table 1 Experimental data statistics

[0097] Test indicators Traditional manual meter reading The present invention Improvement Meter reading accuracy (%) 89.8 98.7 8.9 Average single-station meter reading time (minutes) 47 12 74.5％ Single station labor cost (man-hours) 1.5 0.3 80％ Abnormal recognition rate (%) 85.1 96.3 11.2 Data upload timeliness rate (%) 76.5 99.8 23.3 Meter reading missed rate (%) 4.2 0.3 92.9％ System operation and maintenance cost (yuan / month / station) 0 180 - Data traceability completeness (%) 82.3 100 17.7

[0098] As shown in Table 1, the present invention has achieved significant improvements in various key performance indicators: the meter reading accuracy rate has increased from 89.8% to 98.7%, indicating that the YOLO algorithm of the present invention combined with the recognition scheme of SIFT feature transformation has high reliability; the average single-station meter reading time has been greatly reduced from 47 minutes to 12 minutes, the efficiency has been improved by 74.5%, and the labor cost has been reduced by 80%, which fully verifies the automation advantage of the present invention; in terms of abnormal identification, the recognition rate of the present invention reaches 96.3%, which is 11.2 percentage points higher than that of manual work, and the timely rate of data upload has been increased to 99.8%, and the missed reading rate is only 0.3%, which is significantly improved compared with the 4.2% of the manual method; although the system needs to invest 180 yuan / station in operation and maintenance costs per month, considering the substantial savings in labor costs (reduced by 80%) and the improvement of data traceability integrity (reaching 100%), the investment is highly economical. These data fully confirm that the present invention has significant advantages in improving the efficiency, accuracy and reliability of substation meter reading.

[0099] In summary, the automatic identification system of the present invention can automatically obtain the instrument data in the station, automatically generate instrument data reports in the background, and mark data jumps, no readings, etc., and can also mark abnormal conditions of the meter. The automatic meter reading method can help on-site operation and maintenance personnel accurately obtain the instrument data in the station, help on-site inspection personnel accurately grasp the changes in instrument data and the operating status of the meter, and use the background and on-site data for comparison and algorithm verification to provide rapid decision support for on-site operation and maintenance personnel. When the automatic meter reading module and the instrument operating status diagnosis are completed, the corresponding table can be automatically generated. In the diagnosis of the substation operating status, the timely prompt of abnormal points can accurately guide the on-site work and improve work efficiency and work accuracy.

[0100] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An automatic meter reading system for instruments in a substation, characterized in that: include: The meter reading work is completed by the meter reading software in the substation, and the meter reading software in the substation includes an automatic meter reading module and a meter reading photo analysis module; The automatic meter reading module is used to establish network communication with the main control room computer using a mobile terminal, take photos of the on-site instruments through the mobile terminal to obtain meter reading photos, and transmit the meter reading photos back to the main control room computer, and the main control room computer automatically downloads the meter reading photos and transmits them to the meter reading photo analysis module for calculation; The meter reading photo analysis module is used to initialize the meter reading photo, locate the target and calculate the meters contained in the meter reading photo by using a scale-invariant feature transformation, extract the contour of the target and convert it into a binary image, find the black and white boundary in the binary image, identify the edge coordinates of the meter pointer by using a contour matching method, and calculate the meter reading pointed to by the meter pointer by finding the black and white boundary in the binary image.

2. The automatic meter reading system for substation instruments according to claim 1, characterized in that: The mobile terminal communicates with the main control room computer through the network, so that the main control room computer receives the meter reading photos uploaded by the on-site operation and maintenance, and reports the recognized meter data to the main control room computer in real time; The network communication uses a wireless transmission module, which is one of the NB-IoT module, LoRaWAN module, and Bluetooth module.

3. The automatic meter reading system for substation instruments according to claim 2, characterized in that: The meter reading photo analysis module calculates the meter reading according to the position of the meter pointer, including the following steps: Calculate the coordinates of all meter pointers in the meter reading photo; Determine whether the pointer positions of all instruments have been calculated. If so, continue the calculation, otherwise, end; Perform instrument pointer position analysis, use a binary method to represent the instrument pointer position, and obtain binary data of the instrument pointer position; The meter pointer position binary data is matched with the meter reading database to obtain the meter reading.

4. The automatic meter reading system for substation instruments as claimed in claim 3, characterized in that: The two-tuple data of the instrument pointer position is matched with the instrument reading database, specifically, there is a one-to-one correspondence between the two-tuple data of the pointer position of each instrument and the instrument reading database.

5. The automatic meter reading system for substation instruments as claimed in claim 4, characterized in that: To obtain the meter reading, you need to: Extract all kinds of instrument pattern samples from the instrument database and train the YOLO algorithm model to identify the instrument diagram; The scale-invariant feature transform (SIFT) method is used to identify photos and locate all instrument patterns; Frame the instrument in the photo, convert it into a binary image, use the contour matching method to find the pointer position, extract the pointer image, and obtain the pointer position in all images; With the pointer as the center point, move 20 pixels upward as the first point, and move 40 pixels downward as the second point. The coordinates of the two points are expressed as a binary tuple to represent the pointer position. Match the pointer position binary data with the instrument database one by one; Match the corresponding data readings according to the pointer position binary.

6. The automatic meter reading system for substation instruments according to claim 5, characterized in that: After obtaining the meter reading, a substation meter reading result report is generated; The substation meter reading result report includes a substation meter reading result table, a substation in-station instrument meter reading report and a substation in-station instrument manual meter reading report.

7. The automatic meter reading system for substation instruments according to claim 6, characterized in that: The substation meter reading result table is a report of the readings and standard values ​​of all meters in each station generated by the automatic meter reading module, with abnormal conditions marked for manual confirmation and processing; The substation meter reading report is based on the specific meter types and quantities of the substation meter reading sites, and generates a corresponding number of blank reports, which are manually confirmed and processed; The manual meter reading report of the substation instrument: according to the manual meter reading situation of the substation, the meter reader performs one-key confirmation by the operation and maintenance personnel based on the manual meter reading data, and automatically generates the station instrument data report to confirm the meter reading situation of the station instrument.

8. A method for automatic meter reading in a substation using the automatic meter reading system for substation instruments as claimed in any one of claims 1 to 7, characterized in that: include: The meter reading software in the substation establishes network communication with the computer in the main control room through the mobile terminal, takes photos of the on-site instruments and transmits them back to the computer in the main control room; Use the YOLO algorithm to train and identify instrument samples, use the SIFT feature transformation method to locate the instrument, and convert the photo into a binary image; The pointer is used as the center point and moves up and down to determine the coordinates of the two points to form a binary group. The pointer position is identified by contour matching and matched with the database to obtain the reading; The computer in the main control room generates a substation meter reading result table based on the identification results, marks abnormal conditions and supports manual confirmation processing; The system generates blank reports based on the type of site instruments, and can generate data reports based on manual meter reading data with one click by operation and maintenance personnel.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method for automatic meter reading in a substation according to claim 8 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, the steps of the method for automatic meter reading in a substation according to claim 8 are implemented.

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