CN-122026949-A - Anti-interference method and system for inverter communication data acquisition

CN122026949ACN 122026949 ACN122026949 ACN 122026949ACN-122026949-A

Abstract

The application provides an anti-interference method and system for inverter communication data acquisition, and belongs to the technical field of power electronic communication. The method comprises the steps of collecting an original communication frame sequence in a communication bus in the operation process of an inverter, synchronously collecting interference sensing data representing the electromagnetic environment state of the inverter, constructing a communication-interference coupling feature set, carrying out joint mapping to generate a multi-dimensional interference feature tensor, carrying out structural analysis on the multi-dimensional interference feature tensor to generate an interference feature description parameter, constructing a communication frame disturbance prediction model, calculating frame structure offset and data field disturbance quantity of each communication frame in the current interference environment, and carrying out reverse compensation reconstruction of the corresponding communication frame when the communication frame meets the door control detection abnormality, and outputting an anti-interference data set. According to the application, the interference characteristics are accurately represented, the reverse compensation reconstruction is carried out on the disturbed communication frame, and the communication data acquisition reliability and the anti-interference capability are improved.

Inventors

WANG XIAO
WU WANZHANG
YU XINHUA

Assignees

深圳珈伟低碳科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260315

Claims (10)

1. An anti-interference method for inverter communication data acquisition, which is characterized by comprising the following steps: Acquiring an original communication frame sequence in a communication bus in the running process of the inverter, and synchronously acquiring interference sensing data representing the electromagnetic environment state of the inverter; constructing a communication-interference coupling feature set based on the original communication frame sequence and interference sensing data, and carrying out joint mapping on the communication-interference coupling feature set in a time dimension, a frequency dimension and a communication frame structure dimension to generate a multidimensional interference feature tensor representing the coupling relation between a communication signal and an interference signal; Performing structural analysis on the multidimensional interference feature tensor, extracting periodic electromagnetic interference features, transient impact interference features and random noise features, and generating interference feature description parameters according to spectrum distribution characteristics and time evolution characteristics of each interference feature; Constructing a communication frame disturbance prediction model based on disturbance characteristic description parameters and frame structure evolution characteristics in a continuous communication frame sequence, and calculating frame structure offset and data field disturbance quantity of each communication frame in a current disturbance environment by using the communication frame disturbance prediction model; And when the communication frame meets the door control detection abnormality, performing reverse compensation reconstruction of the corresponding communication frame through the frame structure offset and the data field disturbance quantity, and outputting an anti-interference data set.
2. The method for collecting anti-interference data according to claim 1, wherein the interference sensing data includes on state of a switching device, electromagnetic noise intensity and bus current variation characteristics.
3. The method for anti-interference data acquisition of inverter communication according to claim 1, wherein constructing a communication frame disturbance prediction model based on the disturbance characteristic description parameter and the frame structure evolution characteristic in the continuous communication frame sequence comprises: constructing an interference state vector according to the interference characteristic description parameters, and generating an interference phase sequence according to the change rule of the interference state vector on a time axis, wherein the interference phase sequence is used for representing an action interval of interference on a communication frame time dimension; Carrying out frame structure analysis on the continuous communication frame sequence, extracting the sequence relation, the check dependency relation and the history change relation of each data field in the communication frame, and outputting the sequence relation, the check dependency relation and the history change relation as frame structure evolution characteristics; Constructing a communication frame structure association diagram by utilizing the frame structure evolution characteristics, mapping the interference phase sequence into the communication frame structure association diagram, and executing disturbance propagation calculation on frame structure nodes under the interference action to acquire propagation paths and propagation intensities of interference among all communication fields; and establishing a field disturbance solving function according to the propagation path, the propagation intensity and the field change sequence of the historical communication frame to form a communication disturbance prediction model.
4. The method of claim 3, wherein establishing a field disturbance solving function based on the propagation path, the propagation strength and the sequence of field changes of the historical communication frame comprises: extracting a propagation node sequence of interference in a communication frame structure association diagram according to the propagation path, and calculating an interference weight coefficient corresponding to each propagation node according to the propagation intensity; Calculating stability parameters of each communication field by using a historical communication frame field change sequence, wherein the stability parameters are used for representing the change sensitivity degree of the corresponding communication field in continuous communication frames; Coupling calculation is carried out on the interference weight coefficient and the stability parameter, and a field disturbance contribution value corresponding to each communication field is generated; Based on the structure connection relation of each communication field in the communication frame structure association graph, carrying out structure mapping on the field disturbance contribution values to generate a field association weight matrix for representing disturbance propagation relation among the fields; And establishing a field disturbance solving function based on the field association weight matrix.
5. The method for anti-interference data collection for inverter communication according to claim 1, wherein determining that the communication frame satisfies the gating detection anomaly comprises: Setting a plurality of abnormal judgment indexes according to the continuous frame sequence and the historical communication frame statistical information, wherein the abnormal judgment indexes comprise frame time sequence offset, data field error rate, check field abnormality and frame integrity abnormality; And calculating each abnormal judgment index value of the communication frame to be detected, executing multi-index comprehensive judgment according to the multiple abnormal judgment indexes and calculation results, and judging the communication frame to be detected as an abnormal frame when at least one index exceeds a corresponding gating threshold or meets a gating combination condition.
6. The method of claim 5, wherein performing the inverse compensation reconstruction of the corresponding communication frame by the frame structure offset and the data field disturbance amount comprises: According to the frame structure offset, reversely aligning and adjusting the initial position of the abnormal communication frame in the continuous communication frame sequence, and carrying out sliding correction on the boundary of the abnormal communication frame on a time axis so as to recover the original frame structure boundary of the abnormal communication frame; after the frame structure alignment is completed, performing structure backtracking positioning on each data field in the abnormal communication frame according to the communication frame structure association diagram and the field position relation, and determining the target field position of each data field in an undisturbed state; And executing reverse compensation calculation of the target field position according to the data field disturbance quantity corresponding to each data field so as to complete reverse compensation reconstruction.
7. The method of claim 1, wherein performing structural analysis on the multidimensional interference feature tensor to extract periodic electromagnetic interference features, transient impact interference features, random noise features, comprises: Tensor expansion is carried out on the multidimensional interference characteristic tensor according to a time dimension, a frequency dimension and a signal amplitude gradient dimension, and an interference evolution spectrum matrix is constructed; Performing frequency domain periodic detection on the interference evolution spectrum matrix, extracting an interference component with stable frequency peak value and phase continuity, and mapping the interference component into a periodic electromagnetic interference characteristic; Performing abrupt gradient detection on the interference evolution spectrum matrix in a time dimension, identifying interference fragments meeting transition amplitude and duration thresholds, and extracting transient impact interference features based on the interference fragments; And carrying out statistical distribution analysis on the residual signals which are not selected, extracting a mean shift parameter, a variance fluctuation parameter and a spectrum density discrete parameter, and mapping the extraction result into random noise characteristics.
8. The method for anti-interference data acquisition for inverter communication according to claim 1, wherein the reverse compensation reconstruction of the corresponding communication frame is performed by using the frame structure offset and the data field interference, further comprising: performing consistency check of a reverse compensation reconstruction result, wherein the consistency check comprises field logic relation check, historical sequence continuity check and field validity check; and when the consistency check is passed, outputting the reverse compensation reconstruction result as an anti-interference data set.
9. The method for anti-interference data collection of inverter communication according to claim 8, wherein when the consistency check fails, a secondary reverse compensation reconstruction is performed and an abnormal check early warning signal is synchronously reported.
10. An inverter communication data acquisition anti-interference system for implementing the inverter communication data acquisition anti-interference method according to any one of claims 1 to 9, the system comprising: the original data acquisition module is used for acquiring an original communication frame sequence in the communication bus in the operation process of the inverter and synchronously acquiring interference sensing data representing the electromagnetic environment state of the inverter; The characteristic tensor generation module is used for constructing a communication-interference coupling characteristic set based on the original communication frame sequence and the interference sensing data, and carrying out joint mapping on the communication-interference coupling characteristic set in the time dimension, the frequency dimension and the communication frame structure dimension to generate a multidimensional interference characteristic tensor for representing the coupling relation between the communication signal and the interference signal; The characteristic parameter generation module is used for executing structural analysis on the multidimensional interference characteristic tensor, extracting periodic electromagnetic interference characteristics, transient impact interference characteristics and random noise characteristics, and generating interference characteristic description parameters according to the spectrum distribution characteristics and the time evolution characteristics of each interference characteristic; The frame disturbance prediction module is used for constructing a communication frame disturbance prediction model based on disturbance characteristic description parameters and frame structure evolution characteristics in a continuous communication frame sequence, and calculating frame structure offset and data field disturbance quantity of each communication frame in the current disturbance environment by using the communication frame disturbance prediction model; And the reverse compensation reconstruction module is used for executing reverse compensation reconstruction of the corresponding communication frame through the frame structure offset and the data field disturbance quantity when the communication frame meets the door control detection abnormality, and outputting an anti-interference data set.

Description

Anti-interference method and system for inverter communication data acquisition Technical Field The invention relates to the technical field of power electronic communication, in particular to an anti-interference method and system for inverter communication data acquisition. Background The inverter is used as core equipment in a power electronic system and is widely applied to the scenes of photovoltaic power generation, wind power generation, energy storage systems and the like. The inverter needs to continuously collect operation data through a communication bus in the operation process so as to realize real-time monitoring and control of the equipment state. However, the high-frequency switching action of the inverter can generate strong electromagnetic interference, and meanwhile, the factors such as fluctuation of an external power grid, electromagnetic radiation of peripheral equipment and the like can also introduce complex interference signals on a communication bus, so that the communication data acquisition quality is reduced. In the prior art, a hardware filtering or simple data checking mechanism is generally adopted for an anti-interference processing mode of inverter communication data. The hardware filtering scheme relies on priori knowledge of interference frequency, so that the problem of dynamic migration of interference frequency spectrum caused by the change of inverter operation conditions is difficult to deal with, a simple data checking mechanism can only judge whether a communication frame has errors or not, effective quantitative analysis and recovery of disturbed data cannot be carried out, retransmission can be discarded only once an abnormal frame is detected, and the communication efficiency is greatly reduced under the environment of frequent interference. In addition, the prior art lacks systematic modeling capability for the coupling relation between the electromagnetic environment of the inverter and the communication signals, and cannot distinguish the influence mechanisms of different types of interference such as periodic electromagnetic interference, transient impact interference, random noise and the like on the communication frame, so that a differential compensation strategy cannot be adopted for different interference types. The method and the device make the communication data acquisition reliability of the existing scheme in a complex electromagnetic environment insufficient, and are difficult to meet the actual requirements of an inverter system on data integrity and instantaneity. Therefore, the technical problems that communication frame data is distorted and interference influence cannot be effectively identified and compensated due to electromagnetic interference in the process of communication data acquisition of the inverter exist in the prior art. Disclosure of Invention The invention provides an anti-interference method and system for inverter communication data acquisition, which aims at solving the technical problems that communication frame data is distorted and interference influence cannot be effectively identified and compensated due to electromagnetic interference in the process of inverter communication data acquisition in the prior art. The technical scheme for solving the technical problems is as follows: The invention provides an inverter communication data acquisition anti-interference method which comprises the steps of acquiring an original communication frame sequence in a communication bus in the operation process of an inverter, synchronously acquiring interference sensing data representing the electromagnetic environment state of the inverter, constructing a communication-interference coupling characteristic set based on the original communication frame sequence and the interference sensing data, carrying out joint mapping on the communication-interference coupling characteristic set in a time dimension, a frequency dimension and a communication frame structure dimension to generate a multi-dimensional interference characteristic tensor representing the coupling relation between a communication signal and an interference signal, carrying out structural analysis on the multi-dimensional interference characteristic tensor, extracting periodic electromagnetic interference characteristics, transient impact interference characteristics and random noise characteristics, generating interference characteristic description parameters according to the spectral distribution characteristics and the time evolution characteristics of each interference characteristic, constructing a communication frame disturbance prediction model based on the interference characteristic description parameters and the frame structure evolution characteristics in the continuous communication frame sequence, calculating the frame structure offset and the data field disturbance quantity of each communication frame in the current interference environment by using the commu