Low-voltage area electric energy meter time correction method and system based on voltage transition event

Abstract

The present application relates to the technical field of electric energy meter time correction, and particularly relates to a low-voltage area electric energy meter time correction method and system based on voltage transition events, which is based on time stamp and voltage transition events for two-dimensional time correction, does not require the time correction package to arrive in real time, and the synchronization error mainly depends on the detection accuracy of the voltage transition event, is decoupled from the transmission delay and asymmetric jitter, greatly improves the time correction accuracy and stability of the low-voltage area inventory electric energy meter, and only relies on voltage effective value measurement and existing communication to be implemented, without additional equipment, and greatly reduces the time correction cost compared with Beidou / GPS time service.

Description

Technical Field

[0001] This invention relates to the field of electricity meter calibration technology, and in particular to a method and system for calibrating low-voltage distribution area electricity meters based on voltage transition events, electronic equipment, and computer-readable storage medium. Background Technology

[0002] With the continuous advancement of power grid digitalization and intelligentization, the value of power data is constantly increasing. Accurate timestamps are a direct manifestation and prerequisite for data value. Without unified and reliable timestamps, power data cannot be reliably compared, correlated, and reused. Therefore, data with accurate timestamps can serve as part of the power grid's digital infrastructure, supporting event analysis, operational analysis, and business collaboration. This can significantly accelerate the power grid's intelligentization process and enhance its manageability, controllability, and verifiability. Currently, time synchronization of electricity meters in low-voltage distribution areas mainly relies on two methods: internal concentrator distribution and external BeiDou / GPS time synchronization. Among these, BeiDou / GPS time synchronization has high hardware and deployment costs, making it difficult to scale up for low-cost low-voltage distribution area electricity meters. Concentrator distribution completes time synchronization by distributing timestamps through the concentrator, requiring the time synchronization packet to arrive "as quickly and predictably." This time synchronization method is one-dimensional (time dimension only), and the time synchronization error is highly sensitive to transmission delay and asymmetric jitter. It often requires delay modeling, round-trip time (RTT), or delay symmetry assumptions. Compensation is required, and in complex distribution area environments, especially with the continuous development of new energy technologies, there is a coexistence of high proportion of new energy access and high proportion of power electronic equipment in low-voltage distribution areas. The increase in the proportion of new energy will bring source-side randomness with the output fluctuating with weather and dispatch conditions, while the uncertainty of user electricity consumption behavior will enhance load-side randomness. This dual high and dual random load characteristic exacerbates the time-varying nature of distribution area impedance and noise spectrum, and makes communication link delay and jitter difficult to predict. The traditional one-dimensional time synchronization that relies on "instant message arrival" is more prone to instability, resulting in poor time synchronization accuracy and stability. Summary of the Invention

[0003] This invention provides a method and system for calibrating low-voltage distribution area energy meters based on voltage transition events, as well as an electronic device and a computer-readable storage medium. It can improve the calibration accuracy and stability of existing low-voltage distribution area energy meters and reduce calibration costs.

[0004] According to one aspect of the present invention, a method for calibrating low-voltage distribution area electricity meters based on voltage transition events is provided, wherein the low-voltage distribution area includes a main meter and several household meters, and includes the following:

[0005] Detect voltage transition events on the main meter side and record transition characteristics, encapsulate the transition characteristics into a broadcast message and broadcast it to the meters in the transformer area; wherein, the transition characteristics include transition amplitude, transition direction and timestamp;

[0006] Detect voltage transition events on the household meter side and record the transition characteristics;

[0007] Event matching is performed based on the transition characteristics of the household meter and the main meter. The time offset between the main meter and the household meter is determined based on the successfully matched voltage transition events, and the household meter is then calibrated locally based on this time offset.

[0008] Furthermore, the process of performing event matching based on the transition characteristics of the household meter side and the transition characteristics of the main meter side, and determining the time offset between the main meter and the household meter based on the successfully matched voltage transition events, includes the following:

[0009] A local event map is generated based on the transition characteristics of multiple voltage transition events on the household meter side, and a master event map is generated based on multiple received broadcast messages.

[0010] Within the preset time offset range, select several candidate time offsets, perform time shifting operations on the local event graph based on the selected candidate time offsets, and perform event matching between the time-shifted local event graph and the overall event graph to calculate the total matching score for each candidate time offset.

[0011] The candidate time offset with the highest total matching score is recorded as the optimal time offset between the total table and the user table.

[0012] Furthermore, the total matching score for each candidate time offset is calculated based on the following formula:

[0013] ;

[0014] ;

[0015] in, Indicates the candidate time offset The total matching score below, Indicates the time offset of the candidate Next, the local first i The voltage transition event that matches its first j Matching score of each total meter voltage transition event. Indicates the first i The timestamp of the local voltage transition event after time shifting is the same as the timestamp of the first local voltage transition event. j The time difference between the timestamps of the voltage transition events of each total meter. This indicates the preset time tolerance. This represents the influence coefficient of the transition amplitude. Indicates the first i The local voltage transition event and the first j The difference in transition amplitude of each total meter voltage transition event. This indicates the preset tolerance for the difference in transition amplitude.

[0016] Furthermore, it also includes the following:

[0017] Obtain multiple pairs of matching events corresponding to the optimal time offset, calculate the time difference between each pair of matching events, and take the median, mean, or mode of the time difference calculation results of all matching event pairs as the final time offset for time synchronization.

[0018] Furthermore, the subsequent event matching steps are only executed when the number of events in both the local event graph and the overall event graph reaches a preset number, or when a preset statistical time window is reached.

[0019] Furthermore, the process of performing event matching based on the transition characteristics of the household meter side and the transition characteristics of the main meter side, and determining the time offset between the main meter and the household meter based on the successfully matched voltage transition events, includes the following:

[0020] A local event map is generated based on the transition characteristics of multiple voltage transition events on the household meter side. The local event map is then matched with the transition characteristics of the master meter side in a broadcast message to find the local voltage transition events that match the master meter voltage transition events. The time difference between the two successfully matched voltage transition events is taken as the time offset between the master meter and the household meter.

[0021] Furthermore, the conditions for successful event matching are: the difference between the timestamps of the two events is within the preset time tolerance, the transition directions are consistent, and the difference between the transition amplitudes of the two events is within the preset transition amplitude difference tolerance.

[0022] In addition, the present invention also provides a time synchronization system for low-voltage distribution area energy meters based on voltage transition events, comprising:

[0023] The first event detection module is used to detect voltage transition events on the main meter side and record transition characteristics, encapsulate the transition characteristics into a broadcast message and broadcast it to the meters in the transformer area; wherein, the transition characteristics include transition amplitude, transition direction and timestamp;

[0024] The second event detection module is used to detect voltage transition events on the customer meter side and record the transition characteristics.

[0025] The event matching and time synchronization module is used to match events based on the transition characteristics of the household meter and the main meter. It determines the time offset between the main meter and the household meter based on the successfully matched voltage transition events, and performs local time synchronization on the household meter based on the time offset.

[0026] In addition, the present invention also provides an electronic device, including a processor and a memory, wherein the memory stores a computer program, and the processor executes the steps of the method described above by calling the computer program stored in the memory.

[0027] In addition, the present invention provides a computer-readable storage medium for storing a computer program for calibrating low-voltage distribution area energy meters based on voltage transition events, wherein the computer program executes the steps of the method described above when running on a computer.

[0028] The present invention has the following beneficial effects:

[0029] The present invention provides a low-voltage distribution area energy meter time synchronization method based on voltage transition events. First, voltage transition events are detected and voltage transition characteristics are recorded at the main meter side. These transition characteristics are then encapsulated into a broadcast message and broadcast within the distribution area. Next, voltage transition events are detected and voltage transition characteristics are recorded at each household meter side. Finally, at each household meter side, event matching is performed based on the household meter side's voltage transition characteristics and the main meter side's voltage transition characteristics. If the event matching is successful, it is determined that the two voltage transition events at the household meter side and the main meter side belong to the same voltage transition event within the distribution area. Based on the successfully matched voltage transition events, the time offset between the main meter and the household meters is determined, and the household meters are then synchronized locally based on this time offset. The present invention provides a time synchronization method for low-voltage distribution area energy meters based on voltage transition events. This method performs two-dimensional time synchronization based on timestamps and voltage transition events, without requiring the time synchronization packet to arrive instantly. The synchronization error mainly depends on the detection accuracy of the voltage transition events. It is decoupled from transmission delay and asymmetric jitter, which greatly improves the time synchronization accuracy and stability of existing energy meters in low-voltage distribution areas. Furthermore, it can be achieved solely by measuring the effective voltage value and existing communication, without the need for additional equipment. Compared with BeiDou / GPS time synchronization, this method significantly reduces the time synchronization cost.

[0030] In addition, the low-voltage distribution area energy meter time calibration system based on voltage transition events of the present invention also has the above-mentioned advantages.

[0031] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0032] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0033] Figure 1 This is a simplified diagram of the topology of the low-voltage distribution area;

[0034] Figure 2This is a flowchart illustrating a preferred embodiment of the time calibration method for low-voltage distribution area energy meters based on voltage transition events in this application.

[0035] Figure 3 yes Figure 2 A schematic diagram of the sub-process of step S3;

[0036] Figure 4 This is a schematic diagram of the local event graph generated in a preferred embodiment of this application;

[0037] Figure 5 This is a schematic diagram of the event graph of the summary table generated in a preferred embodiment of this application;

[0038] Figure 6 yes Figure 2 Another sub-process diagram of step S3;

[0039] Figure 7 This is a schematic diagram of the module structure of a low-voltage distribution area energy meter time calibration system based on voltage transition events, according to another embodiment of this application. Detailed Implementation

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0041] It is understood that the technical objective of this invention is to provide accurate time calibration for existing low-cost electricity meters in low-voltage distribution areas, such as... Figure 1 As shown, a low-voltage distribution area includes a main meter and several individual meters. Multiple adjacent meters are located in a single meter box, and each meter is connected to the same distribution area transformer and feeder. Voltage is a shared state variable within the distribution area. When disturbances occur upstream or within the distribution area (such as sudden increases / decreases of high-power loads, short-term faults, reactive / capacitor switching, etc.), the transient effect determined by the equivalent internal resistance of the busbar causes simultaneous voltage jumps at each node. The jump amplitude decreases with electrical distance. Because the equivalent impedance from different branches to the transformer is different, the drop amplitude and recovery slope of each node differ, typically showing a deeper drop near the node and a shallower drop far from the node. However, the start and end times of the jump are highly consistent, which can be used for time synchronization. Therefore, voltage jumps possess the physical characteristics of being simultaneously observable across the entire distribution area, having highly consistent start and end times, and having distinguishable amplitudes due to impedance differences. Therefore, this invention combines voltage jump events with timestamps for two-dimensional time synchronization. (Refer to...) Figure 2 A preferred embodiment of this application provides a time calibration method for low-voltage distribution area energy meters based on voltage transition events, including the following:

[0042] Step S1: Detect voltage transition events on the main meter side and record transition characteristics, encapsulate the transition characteristics into a broadcast message and broadcast it to the meters in the transformer area; wherein, the transition characteristics include transition amplitude, transition direction and timestamp;

[0043] Step S2: Detect voltage transition events on the customer meter side and record the transition characteristics;

[0044] Step S3: Perform event matching based on the transition characteristics of the household meter side and the transition characteristics of the main meter side. Determine the time offset between the main meter and the household meter based on the successfully matched voltage transition events, and perform local time synchronization on the household meter based on the time offset.

[0045] It is understood that the low-voltage distribution area energy meter time synchronization method based on voltage transition events in this embodiment first detects voltage transition events and records the voltage transition characteristics at the main meter side, encapsulates the transition characteristics into a broadcast message and broadcasts it within the distribution area. Then, voltage transition events are detected and voltage transition characteristics are recorded at each household meter side. Finally, at each household meter side, event matching is performed based on the voltage transition characteristics of the household meter side and the voltage transition characteristics of the main meter side. If the event matching is successful, it is determined that the two voltage transition events at the household meter side and the main meter side belong to the same voltage transition event within the distribution area. Based on the successfully matched voltage transition events, the time offset between the main meter and the household meter is determined, and the household meter is locally synchronized based on the time offset. The present invention provides a time synchronization method for low-voltage distribution area energy meters based on voltage transition events. This method performs two-dimensional time synchronization based on timestamps and voltage transition events, without requiring the time synchronization packet to arrive instantly. The synchronization error mainly depends on the detection accuracy of the voltage transition events. It is decoupled from transmission delay and asymmetric jitter, which greatly improves the time synchronization accuracy and stability of existing energy meters in low-voltage distribution areas. Furthermore, it can be achieved solely by measuring the effective voltage value and existing communication, without the need for additional equipment. Compared with BeiDou / GPS time synchronization, this method significantly reduces the time synchronization cost.

[0046] In step S1, the master meter / concentrator (referred to as the master meter in this invention) provides a time reference for the transformer area. The master meter measures the voltage of the transformer area at a fixed measurement period (e.g., 1 second, 1 / 4 second, 1 / 2 second, etc.) to obtain the effective voltage value (RMS) of the current period, denoted as... U t Then, it is determined whether a voltage transition event has occurred. The determination process is as follows: calculate the absolute value of the voltage difference between the current moment and the previous moment. , This indicates the current state of the summary table. t The voltage change value, and These represent the effective voltage values ​​measured by the meter at the current time and the previous time, respectively. , This represents the voltage transition threshold, which can be set as a percentage of the rated voltage. A voltage transition event is then determined to have occurred. Greater than If, then it is an upward jump, if Less than This is a lower transition. For voltage transition events, the transition characteristics of the voltage are recorded, including the transition amplitude. Leap direction (Up jump or down jump) and timestamp , Indicates the first j The timing of each voltage transition event is determined. Furthermore, the transition characteristics of at least one voltage transition event are encapsulated into a broadcast message and broadcast to all meters within the transformer area. Each meter can then use the received broadcast message for time synchronization.

[0047] Additionally, in step S2, the household meter measures the local voltage according to the same cycle as the main meter, obtaining the effective value of the time-series voltage, which is denoted as... u t Similarly, the effective voltage values ​​at two adjacent moments are calculated using differential methods: , and This represents the effective voltage value measured by the meter at the current moment compared to the previous moment. Indicates the current time of the user table t The voltage change value, if If a voltage transition event occurs locally, it is determined that a voltage transition event has occurred. If, then it is recorded as a local jump, if This is recorded as a local voltage transition. Simultaneously, the timestamp of the local voltage transition event is recorded. transition amplitude and leap direction .

[0048] In addition, in step S3, after the voltage transition event detection and transition feature recording are completed on the main meter side and the user meter side, the transition feature includes both a timestamp and voltage transition features (amplitude and direction), which has two-dimensional characteristics of time + transformer area physical event. Event matching can be performed based on the transition features on the user meter side and the transition features on the main meter side, and the time offset between the main meter and the user meter can be determined based on the successfully matched voltage transition event. Then, the user meter is calibrated locally based on the time offset.

[0049] In one embodiment, the process of performing event matching based on the transition characteristics of the customer meter side and the transition characteristics of the main meter side, and determining the time offset between the main meter and the customer meter based on the successfully matched voltage transition events, includes the following:

[0050] A local event map is generated based on the transition characteristics of multiple voltage transition events on the household meter side. The local event map is then matched with the transition characteristics of the master meter side in a broadcast message to find the local voltage transition events that match the master meter voltage transition events. The time difference between the two successfully matched voltage transition events is taken as the time offset between the master meter and the household meter.

[0051] It is understandable that the main meter only needs to detect one voltage transition event before broadcasting a message within the transformer area, while the individual meter needs to detect multiple voltage transition events and generate a local event map. Then, the local event map is matched with the transition features of the main meter in a broadcast message. That is, the local voltage transition event that belongs to the same event as the voltage transition event of the main meter is found in the local event map. After finding the matching local voltage transition time, the time difference (i.e., the timestamp difference) between the successfully matched voltage transition event of the main meter and the local voltage transition event can be used as the time offset between the main meter and the individual meter. Then, the individual meter is synchronized locally based on this time offset. The above operation is performed on all individual meters to complete the time synchronization of all individual meters in the transformer area.

[0052] Optionally, in this invention, the conditions for successful event matching are: the difference between the timestamps of the two events is within a preset time tolerance (i.e., time proximity), the transition directions are consistent, and the difference between the transition amplitudes of the two events is within a preset transition amplitude difference tolerance (i.e., similar amplitudes). Of course, in other embodiments of this invention, only one or two of the conditions of consistent direction, time proximity, and similar amplitudes can be considered as conditions for successful event matching. However, this would result in a larger number of successfully matched event pairs, increasing the computational load and affecting computational accuracy.

[0053] It is understood that in the above embodiments, event matching based on a single voltage transition event on the main meter side can only yield one successfully matched event pair. Furthermore, external interference may prevent the acquisition of matching event pairs, leading to local time synchronization failure. Even if a match is successful, performing local time synchronization on the user meter side based solely on the time difference of a single matched event pair requires improvement in accuracy and stability. Therefore, as a preferred embodiment, such as... Figure 3 As shown, the process of matching events based on the transition characteristics of the household meter side and the transition characteristics of the main meter side, and determining the time offset between the main meter and the household meter based on the successfully matched voltage transition events, includes the following:

[0054] Step S31: Generate a local event map based on the transition characteristics of multiple voltage transition events on the household meter side, and generate a master table event map based on multiple received broadcast messages;

[0055] Step S32: Select several candidate time offsets within the preset time offset allowable range, perform time shift operation on the local event map based on the selected candidate time offsets, and perform event matching between the time-shifted local event map and the overall event map to calculate the total matching score for each candidate time offset.

[0056] Step S33: Record the candidate time offset with the highest total matching score as the optimal time offset between the total table and the user table.

[0057] Specifically, local transition features are first added to the local voltage transition event sequence to form a local event map. , N This indicates the number of local (i.e., meter-side) voltage transition events, specifically as follows: Figure 4 As shown. Simultaneously, based on multiple (i.e., at least two) broadcast messages received at the household meter side, each broadcast message contains the transition characteristics of a voltage transition event at the main meter side, including the main meter event timestamp. Total jump amplitude General table transition direction (Above or below), the user table caches multiple broadcast messages in chronological order, generating a master table event graph. , M This indicates the total number of voltage transition events on the meter side, specifically as follows: Figure 5 As shown. Optionally, subsequent event matching steps will only be executed when the number of events in both the local event graph and the master event graph reaches a preset number to ensure sufficient data for subsequent event matching, or when a preset statistical time window is reached to achieve correction according to a preset period.

[0058] Then, in order to estimate the time deviation between the user's local clock and the master clock, the user's meter is within a preset allowable range of time offset. Select several candidate time offsets ,in, and These represent the lower and upper limits of the time offset, respectively, based on each selected candidate time offset. A time-shift operation on the local event graph can be represented as: , Indicates the first i Local voltage transition events are based on candidate time offsets. After performing a time shift, the timestamps are then added to the overall event graph. Search and Recent events If the conditions for successful event matching are met, i.e. (i.e., time proximity) (i.e., consistent direction) and (i.e., similar amplitudes) then the time-shifted first... i The local voltage transition event and the first j Each total meter voltage transition event was successfully matched, and the total matching score for each candidate time offset was calculated based on the following formula:

[0059] ;

[0060] ;

[0061] in, Indicates the candidate time offset The total matching score below, Indicates the time offset of the candidate Next, the local first i The voltage transition event that matches its first j Matching score of each total meter voltage transition event. Indicates the first i The timestamp of the local voltage transition event after time shifting is the same as the timestamp of the first local voltage transition event. j The time difference between the timestamps of the voltage transition events of each total meter. This indicates the preset time tolerance. This represents the influence coefficient of the transition amplitude. Indicates the first i The local voltage transition event and the first j The difference in transition amplitude of each total meter voltage transition event. This represents the preset tolerance for the transition amplitude difference. As can be seen from the above formula, the matching score in a single event... In this study, considering that the transition amplitude will vary within the same distribution area due to different voltage drops on different lines, time is used as the primary criterion for scoring, while the transition amplitude is used as a secondary criterion. Therefore, a transition amplitude influence coefficient is introduced. Its value is generally between 0.2 and 0.3, which can improve the accuracy of the matching score evaluation when the amplitude is not completely consistent but the timing is very accurate, and is more in line with the actual working conditions of the transformer area.

[0062] Finally, the user table compares the total matching scores of all candidate time offsets and selects the candidate time offset with the highest total matching score as the optimal time offset for this time synchronization, which can be expressed as: , This represents the optimal time offset, which can be used as a basis for... Perform local time synchronization on the household meter.

[0063] It is understood that, in order to improve the accuracy and stability of time synchronization, this invention first generates a local event map based on multiple voltage transition events at the user meter side, and then generates a master meter event map based on multiple voltage transition events at the master meter side. Event matching is then performed based on these two event maps, significantly increasing the probability of successful matching and preventing time synchronization failures due to mismatches. Furthermore, several candidate time offsets are selected to perform time shifting operations on the local event map, and the time-shifted local event map is then matched with the master meter event map. The score of each candidate time offset is comprehensively evaluated based on multiple successfully matched event pairs, thereby searching for the optimal candidate time offset, further improving the accuracy and stability of user meter time synchronization. In addition, when evaluating the matching score of a single event, considering that the transition amplitude itself varies within the transformer substation area, time is used as the primary basis for scoring, while the transition amplitude is used as a secondary basis. This approach better reflects the actual operating conditions of the transformer substation area and improves the accuracy of the scoring.

[0064] As a preferred option, such as Figure 6 As shown, in order to further improve the time synchronization accuracy, step S3 also includes the following:

[0065] Step S34: Obtain multiple pairs of matching events corresponding to the optimal time offset, calculate the time difference between each pair of matching events, and take the median, mean, or mode of the time difference calculation results of all matching event pairs as the final time offset for time synchronization.

[0066] Specifically, it can be done with the optimal time offset. Perform another translation operation on the local event graph to obtain multiple pairs of matching events corresponding to the optimal time offset, or extract the optimal time offset from the records of the previous translation operation. For multiple pairs of matching events, the time difference between each pair of matching events can be calculated, which can be expressed as: , Indicates the first k For the time difference of the matching events, and They represent the first k For the timestamps of the total meter-side voltage transition time and the household meter-side voltage transition time in the matched events, take the median, mean, or mode of the time difference calculation results for all matched event pairs. For example, taking the median can be expressed as: As the time offset for the final time synchronization The household form can be used according to Correct the local RTC.

[0067] In addition, such as Figure 7As shown, another embodiment of the present invention also provides a low-voltage distribution area energy meter time synchronization system based on voltage transition events, preferably employing the low-voltage distribution area energy meter time synchronization method based on voltage transition events as described above, including:

[0068] The first event detection module is used to detect voltage transition events on the main meter side and record transition characteristics, encapsulate the transition characteristics into a broadcast message and broadcast it to the meters in the transformer area; wherein, the transition characteristics include transition amplitude, transition direction and timestamp;

[0069] The second event detection module is used to detect voltage transition events on the customer meter side and record the transition characteristics.

[0070] The event matching and time synchronization module is used to match events based on the transition characteristics of the household meter and the main meter. It determines the time offset between the main meter and the household meter based on the successfully matched voltage transition events, and performs local time synchronization on the household meter based on the time offset.

[0071] It is understood that the low-voltage distribution area energy meter time synchronization system based on voltage transition events in this embodiment first detects voltage transition events and records the voltage transition characteristics at the main meter side, encapsulates the transition characteristics into a broadcast message and broadcasts it within the distribution area. Then, it detects voltage transition events and records the voltage transition characteristics at each household meter side. Finally, at each household meter side, it performs event matching based on the voltage transition characteristics of the household meter side and the voltage transition characteristics of the main meter side. If the event matching is successful, it is determined that the two voltage transition events at the household meter side and the main meter side belong to the same voltage transition event within the distribution area. Based on the successfully matched voltage transition events, it determines the time offset between the main meter and the household meter, and performs local time synchronization on the household meter based on the time offset. The present invention provides a time synchronization method for low-voltage distribution area energy meters based on voltage transition events. This method performs two-dimensional time synchronization based on timestamps and voltage transition events, without requiring the time synchronization packet to arrive instantly. The synchronization error mainly depends on the detection accuracy of the voltage transition events. It is decoupled from transmission delay and asymmetric jitter, which greatly improves the time synchronization accuracy and stability of existing energy meters in low-voltage distribution areas. Furthermore, it can be achieved solely by measuring the effective voltage value and existing communication, without the need for additional equipment. Compared with BeiDou / GPS time synchronization, this method significantly reduces the time synchronization cost.

[0072] In addition, another embodiment of the present invention provides an electronic device including a processor and a memory, wherein the memory stores a computer program, and the processor executes the steps of the method described above by calling the computer program stored in the memory.

[0073] In addition, another embodiment of the present invention provides a computer-readable storage medium for storing a computer program for calibrating low-voltage distribution area energy meters based on voltage transition events, wherein the computer program executes the steps of the method described above when running on a computer.

[0074] Common computer-readable storage media include: floppy disks, flexible disks, hard disks, magnetic tapes, any other magnetic media, CD-ROMs, any other optical media, punch cards, paper tape, any other physical media with perforated patterns, random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), flash erasable programmable read-only memory (FLASH-EPROM), any other memory chips or cartridges, or any other media readable by a computer. Instructions may further be transmitted or received by a transmission medium. The term transmission medium can include any tangible or intangible medium used to store, encode, or carry instructions for execution by a machine, and includes digital or analog carrier communication signals or intangible media that facilitate communication of such instructions. Transmission media include coaxial cables, copper wires, and optical fibers, which contain conductors for transmitting a bus of computer data signals.

[0075] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of this application can be implemented in various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0076] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0077] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0078] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0079] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0080] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

[0081] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A time calibration method for low-voltage distribution area energy meters based on voltage transition events, wherein, The low-voltage distribution area includes a master meter and several household meters, characterized by including the following: Detect voltage transition events on the main meter side and record transition characteristics, encapsulate the transition characteristics into a broadcast message and broadcast it to the meters in the transformer area; wherein, the transition characteristics include transition amplitude, transition direction and timestamp; Detect voltage transition events on the household meter side and record the transition characteristics; Event matching is performed based on the transition characteristics of the household meter side and the transition characteristics of the main meter side. The time offset between the main meter and the household meter is determined based on the successfully matched voltage transition events, and the household meter is calibrated locally based on the time offset. The process of matching events based on the transition characteristics of the customer meter side and the transition characteristics of the main meter side, and determining the time offset between the main meter and the customer meter based on the successfully matched voltage transition events, includes the following: A local event map is generated based on the transition characteristics of multiple voltage transition events on the household meter side, and a master table event map is generated based on multiple received broadcast messages. Within a preset time offset range, several candidate time offsets are selected. Based on these selected candidate time offsets, a time shift operation is performed on the local event graph. The shifted local event graph is then matched with the overall event graph, and the total matching score for each candidate time offset is calculated. The total matching score for each candidate time offset is calculated using the following formula: ； ； in, Indicates the candidate time offset The total matching score below, Indicates the time offset of the candidate Next, the local first i The voltage transition event that matches its first j Matching score of each total meter voltage transition event. Indicates the first i The timestamp of the local voltage transition event after time shifting is the same as the timestamp of the first local voltage transition event. j The time difference between the timestamps of the voltage transition events of each total meter. This indicates the preset time tolerance. This represents the influence coefficient of the transition amplitude. Indicates the first i The local voltage transition event and the first j The difference in transition amplitude of each total meter voltage transition event. This indicates the preset tolerance for the difference in transition amplitude; The candidate time offset with the highest total matching score is recorded as the optimal time offset between the total table and the user table.

2. The method for calibrating low-voltage distribution area energy meters based on voltage transition events as described in claim 1, characterized in that, Also includes the following: Obtain multiple pairs of matching events corresponding to the optimal time offset, calculate the time difference between each pair of matching events, and take the median, mean, or mode of the time difference calculation results of all matching event pairs as the final time offset for time synchronization.

3. The method for calibrating low-voltage distribution area energy meters based on voltage transition events as described in claim 1, characterized in that, The subsequent event matching steps will only be executed when the number of events in both the local event graph and the master event graph reaches the preset number, or when the preset statistical time window is reached.

4. The method for calibrating low-voltage distribution area energy meters based on voltage transition events as described in any one of claims 1 to 3, characterized in that, The conditions for successful event matching are: the difference between the timestamps of the two events is within the preset time tolerance, the transition directions are consistent, and the difference between the transition amplitudes of the two events is within the preset transition amplitude difference tolerance.

5. A low-voltage distribution area energy meter time calibration system based on voltage transition events, employing the low-voltage distribution area energy meter time calibration method based on voltage transition events as described in any one of claims 1 to 4, characterized in that, include: The first event detection module is used to detect voltage transition events on the main meter side and record transition characteristics, encapsulate the transition characteristics into a broadcast message and broadcast it to the meters in the transformer area; wherein, the transition characteristics include transition amplitude, transition direction and timestamp; The second event detection module is used to detect voltage transition events on the customer meter side and record the transition characteristics. The event matching and time synchronization module is used to match events based on the transition characteristics of the household meter and the main meter. It determines the time offset between the main meter and the household meter based on the successfully matched voltage transition events, and performs local time synchronization on the household meter based on the time offset.

6. An electronic device, characterized in that, It includes a processor and a memory, wherein the memory stores a computer program, and the processor executes the steps of the method as described in any one of claims 1 to 4 by calling the computer program stored in the memory.

7. A computer-readable storage medium for storing a computer program for calibrating low-voltage distribution area energy meters based on voltage transition events, characterized in that, The computer program, when run on a computer, performs the steps of the method as described in any one of claims 1 to 4.

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