CN-121524895-B - Ammeter clock intelligent calibration method and system based on multi-mode fusion

CN121524895BCN 121524895 BCN121524895 BCN 121524895BCN-121524895-B

Abstract

The invention relates to the technical field of electronic timer calibration, in particular to an ammeter clock intelligent calibration method and system based on multi-mode fusion, wherein the method comprises the steps of firstly acquiring ammeter clock voltage and environment data, preprocessing to generate an instantaneous disturbance sequence and a steady-state voltage time sequence, and then respectively calculating a voltage chronic influence factor, a voltage acute influence factor and an environment acceleration factor according to the instantaneous disturbance sequence and the steady-state voltage time sequence; and finally, constructing a same-batch same-environment ammeter reference group, clustering and screening similar clusters, comparing corrected time consistency to judge irregular abnormality and outputting a targeted calibration strategy. According to the method, the multi-mode fusion is used for quantifying the multi-dimensional error factors, constructing the differential model and generating the dynamic correction period in an iterative manner, so that the defect of the traditional fixed period calibration is overcome, and the stability of the long-term timing precision of the ammeter is improved.

Inventors

PENG YONG
HUANG WEIMING
YE JIAJIAN
ZHANG YUANWU
YANG WENQIN
CHEN YUHANG

Assignees

深圳友讯达科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260114

Claims (5)

1. An ammeter clock intelligent calibration method based on multi-mode fusion is characterized by comprising the following steps: Acquiring clock voltage data and environment state data of an ammeter, preprocessing the voltage data and the environment state data, extracting features, and generating an instantaneous disturbance sequence and a steady-state voltage time sequence; Based on a steady-state voltage time sequence, calculating a voltage chronic influence factor of accumulated damage of long-term harmonic pollution to an ammeter clock circuit by combining the statistical characteristics of a total harmonic distortion rate, a voltage load modulation effect and a harmonic superscalar duration ratio; based on the instantaneous disturbance sequence, respectively quantifying and accumulating impact stress of various transient events according to three events of voltage shock, instantaneous pulse and high-frequency oscillation to obtain a voltage acute influence factor of instantaneous damage of the ammeter clock circuit by short-time voltage disturbance; Determining corresponding influence coefficients of all influence factors through regression analysis of historical data of the similar ammeter, fusing life damage amounts calculated by all factors and the corresponding coefficients to obtain total life damage, and iteratively updating according to a statistical period by taking a reference correction period as an initial value to generate a dynamic correction period of an individual damage state of the ammeter; Constructing a same-batch same-environment ammeter reference group, screening similar reference clusters through high-dimensional stress feature clustering, comparing corrected time consistency to judge whether the target ammeter has abnormal condition or not, and outputting a targeted calibration strategy; The calculation mode of the voltage chronic influence factor comprises the following steps: extracting a total harmonic distortion rate original value, a synchronous port voltage value and an ammeter rated voltage in a steady-state voltage time sequence in a statistical period; the ratio of the port voltage value to the rated voltage is calculated as a load weight factor, and the original value of the total harmonic distortion rate is weighted; Counting the time point duty ratio of the weighted total harmonic distortion rate exceeding the standard regulation limit value to obtain the harmonic time exceeding rate; based on the exceeding degree of the preset quantile and the standard specified limit value and the harmonic time exceeding rate, calculating to obtain a voltage chronic influence factor, and highlighting the nonlinear accelerated aging effect caused by serious exceeding; The calculation mode of the voltage acute impact factor comprises the following steps: Based on the instantaneous disturbance event list, respectively calculating voltage shock stress, instantaneous pulse stress and high-frequency oscillation stress, and accumulating the three types of stress to obtain a voltage acute influence factor; The method comprises the steps of calculating voltage excess, event duration and fixed reference time obtained by combining a voltage shock stress with a tolerance curve, calculating the ratio of an instantaneous pulse stress to a pulse peak value to a device impact tolerance voltage, the ratio of a reference rise time to a pulse duration and a normalization constant obtained by historical data, and calculating the ratio of a high-frequency oscillation stress to a high-frequency oscillation peak value to a high-frequency oscillation tolerance voltage and the ratio of a high-frequency oscillation duration to the fixed reference time; The calculation mode of the environment acceleration factor comprises the following steps: acquiring average ambient temperature and average ambient humidity in a statistical period, introducing rated working temperature and rated working humidity of an ammeter as references, acquiring acceleration action of temperature on ageing of components and acceleration action of humidity on a failure mechanism, and fusing the temperature acceleration action and the humidity acceleration action to obtain an ambient acceleration factor comprehensively reflecting the ageing acceleration effect of environmental stress on an ammeter clock circuit; the process for obtaining the influence coefficient comprises the following steps: Dividing the influence coefficients into two groups, wherein the first group corresponds to voltage chronic influence factors and environment acceleration factors, and the second group corresponds to voltage shock stress, instantaneous pulse stress and high-frequency oscillation stress; The method comprises the steps of collecting historical data of similar ammeter which operates for a long time and has no severe acute impact, obtaining a first group of coefficients through performance degradation regression analysis by taking correction period reduction time as a dependent variable and historical average voltage chronic influence factors and environment acceleration factors as independent variables, collecting transient event records of similar ammeter which operates in a stable environment and has no significant impulse and high-frequency oscillation events, obtaining a second group of coefficients through linear regression by taking difference values of correction periods before and after the events as the dependent variable and corresponding stress values as independent variables.
2. The method for intelligently calibrating an ammeter clock based on multi-modal fusion according to claim 1, wherein the step of obtaining the instantaneous disturbance sequence comprises the steps of: Calculating an extreme value of a root mean square value of voltage data in a preset time period as a residual voltage, and a duration time from the first out-of-limit to the restoration to be within a threshold value as a duration time; And (3) analyzing three types of events including voltage shock, instantaneous pulse and high-frequency oscillation by adopting wavelet decomposition, recording types, starting time, residual voltage and duration of various events, and special high-frequency oscillation main frequency and high-frequency oscillation peak value of the high-frequency oscillation event to form an instantaneous disturbance event list.
3. The method for intelligently calibrating an ammeter clock based on multi-modal fusion according to claim 1, wherein the step of obtaining the steady-state voltage time sequence comprises the steps of: Intercepting a voltage data sequence according to a preset duration, calculating a root mean square value of the voltage data sequence as a port voltage value, performing fast Fourier transform analysis on the voltage data sequence, and extracting a total harmonic distortion rate and each subharmonic amplitude; And integrating the port voltage value, the total harmonic distortion rate and the amplitude of each subharmonic according to the time stamp to construct a steady-state voltage time sequence.
4. The method for intelligently calibrating an ammeter clock based on multi-modal fusion according to claim 1, wherein the iterative generation process of the dynamic correction period comprises the following steps: Taking the reference correction period as an initial value, subtracting the total life damage in the reference correction period from the current correction period in each statistical period to obtain an updated correction period; And in response to the last ammeter correction completion time as a starting point, iteratively updating the correction period until the time accumulated from the starting point reaches the current correction period, triggering ammeter clock correction, and taking the current correction period as a reference period of the next iteration.
5. An intelligent ammeter clock calibration system based on multi-modal fusion, comprising a processor and a memory, wherein the memory stores computer program instructions that when executed by the processor implement the intelligent ammeter clock calibration method based on multi-modal fusion of any one of claims 1-4.

Description

Ammeter clock intelligent calibration method and system based on multi-mode fusion Technical Field The invention relates to the technical field of electronic timer calibration. And particularly relates to an ammeter clock intelligent calibration method and system based on multi-mode fusion. Background With the rapid development of industrial automation and intelligence, the accuracy of the ammeter clock plays a crucial role in industrial metering and control. The accuracy of the ammeter clock directly affects the operation efficiency of the power system, energy consumption management and safe operation of equipment. In complex industrial environments, errors in the meter clock may lead to inaccurate metering, delay in control signals, and even equipment failure, thereby affecting the stability of the overall industrial system. Errors in the meter clock are affected by a combination of factors including long-term environmental changes (e.g., temperature, humidity), equipment aging, and transient power quality disturbances (e.g., voltage surges, dips, harmonics, etc.). These factors are interleaved with each other, making it difficult for the sources of deviations in the meter clock to be accurately diagnosed by single-dimensional analysis. Therefore, it becomes necessary to introduce a multi-modal fusion technique. By collecting the time signal, the voltage data and the environmental state data at the same time, the complex environment where the ammeter is located can be comprehensively perceived, so that a reliable basis is provided for intelligent calibration. The multidimensional data acquisition and analysis mode can identify the source of deviation more accurately, and improves the accuracy and reliability of calibration. However, most of the current conventional ammeter clock calibration methods adopt a simplified clock drift model, and only the correction is performed by fixing the compensation coefficient. This approach ignores the complexity of multi-dimensional errors, which can be categorized, for example, into long term effects (e.g., environmental aging, equipment fatigue) and transient effects (e.g., power quality disturbances, mechanical vibrations). In addition, electric energy meters in industrial sites exhibit significant individual differentiation due to differences in installation location, age, and microenvironment. The existing static calibration scheme can not track the invisible environment changes which are difficult to quantify, so that the synchronous precision of the system is accelerated to be deteriorated under long-term operation, and the high requirements of industrial metering and control on long-term stability are difficult to meet. Disclosure of Invention In order to solve the problems that the conventional ammeter clock calibration method cannot cope with multidimensional errors and ammeter individual differentiation due to model simplification and compensation fixation, so that long-term operation accuracy is deteriorated and industrial high stability requirements are difficult to meet, the invention provides the following aspects. According to the method, impact stress of various transient events is quantized and accumulated respectively according to the transient disturbance sequence, voltage acute impact factors of the transient events are obtained through accumulation, based on the transient disturbance sequence, the transient impact factors of the transient voltage disturbance on the electric meter clock circuit are obtained, based on the environment state data, the acceleration effect of temperature on component aging and the acceleration effect of humidity on a failure mechanism are combined, the environmental acceleration factor of the aging process acceleration effect of the electric meter clock circuit is analyzed, corresponding impact factors are determined through regression analysis of like historical data, the life span of the electric meter is calculated by combining the factors and corresponding factors, total life span loss is obtained, the reference correction period is used as an initial value, the impact stress of the electric meter is corrected according to the statistical period iteration, the transient pulse and the high-frequency oscillation events are corrected, the voltage acute impact factors of the transient damage of the electric meter clock circuit are obtained, the environmental impact factors of the transient damage of the transient voltage disturbance on the electric meter clock circuit are corrected according to the static period iteration, the like, the environmental impact factors are corrected according to the comparison with the conventional reference period, and the comparison of the comparison is judged, and the comparison is made to be similar. Preferably, the step of obtaining the transient disturbance sequence includes: Calculating an extreme value of a root mean square value of voltage data in a preset time period as a residual