CN115086361B

CN115086361B - Analysis system and method for monitoring data of motor train unit, electronic equipment and storage medium

Info

Publication number: CN115086361B
Application number: CN202210533787.2A
Authority: CN
Inventors: 王喜庆; 高秀云; 王莉; 王培顺; 王蓓
Original assignee: Chengdu Huiyan Zhitong Technology Partnership LP
Current assignee: Chengdu Huiyan Zhitong Technology Partnership LP
Priority date: 2022-05-16
Filing date: 2022-05-16
Publication date: 2023-06-16
Anticipated expiration: 2042-05-16
Also published as: CN115086361A

Abstract

The invention discloses a method, a system, electronic equipment and a storage medium for analyzing monitoring data of a motor train unit, belonging to the technical field of motor train units, wherein the method comprises the following steps: analyzing and evaluating the sampled data, and extracting characteristic information of each dimension; analyzing and evaluating the overvoltage and overcurrent data, wherein the waveform reconstruction analysis inverts the overvoltage and overcurrent waveform of the primary side of the voltage transformer through the transfer function reconstruction of the voltage transformer, and can truly show the characteristics of the overvoltage and overcurrent waveform of the contact network side; and inquiring the power quality analysis result and the overvoltage and overcurrent in the database to generate a power quality report and an overvoltage and overcurrent report. The invention combines the electric energy quality report, the overvoltage and overcurrent report and the analysis results of the sampling data and the overvoltage and overcurrent data, and solves the data format conversion problem of the sampling data and the overvoltage and overcurrent data and the problem that the existing analysis system has single function and can not comprehensively analyze and evaluate the electric energy quality and the overvoltage and overcurrent phenomenon.

Description

Analysis system and method for monitoring data of motor train unit, electronic equipment and storage medium

Technical Field

The invention belongs to the technical field of motor train units, and particularly relates to a system and a method for analyzing motor train unit monitoring data, electronic equipment and a storage medium.

Background

Along with the rapid development of the motor train unit, the safe and reliable operation of the motor train unit is more and more emphasized, and further, the requirement on the electric energy quality is higher and higher. In the practical application of the motor train unit, various factors can cause that the traction network system cannot provide good electric energy quality, such as power grid harmonic wave, voltage flicker, voltage distortion, frequency deviation and the like, and meanwhile, frequent operation of various components of the motor train unit in operation, such as main circuit breaker operation, lifting bow operation and the like, can also generate overvoltage and overcurrent phenomena, so that the electric energy quality is affected. Therefore, it is necessary to analyze the sampling data and the overvoltage and overcurrent data of the monitoring of the motor train unit so as to analyze, evaluate and manage the electric energy quality and the overvoltage and overcurrent phenomenon of the motor train unit, and it is particularly important to design an analysis system and an analysis method based on the monitoring data of the motor train unit.

At present, the existing analysis system mainly has the following problems that in mass data acquired by an overvoltage and overcurrent current monitoring system of a motor train unit, most of the mass data are acquired from an actual motor train unit voltage transformer and an actual current transformer, and the original data are influenced by factors such as data format inconsistency, large data volume and the like, so that the problem of monitoring data processing inevitably exists; secondly, in the system and the method for analyzing the monitoring data of the motor train unit, the most important is a data analysis module, and the analysis system based on the monitoring data of the motor train unit mainly analyzes the power quality data and harmonic analysis, has single functions, cannot describe the power quality condition and the change trend, cannot comprehensively describe the logic relationship between the overvoltage and overcurrent data and the power quality, further cannot evaluate the power quality, and cannot fully mine the value of mass data.

Disclosure of Invention

Aiming at the defects in the prior art, the analysis system, the method, the electronic equipment and the storage medium for the monitoring data of the motor train unit solve the data format conversion problem of sampling data and overvoltage data, and solve the problems that the existing analysis system has single function and cannot comprehensively analyze and evaluate the electric energy quality and the overvoltage phenomenon.

In order to achieve the above object, in one aspect, the present invention provides a method for analyzing monitoring data of a motor train unit, including the following steps:

s1, respectively storing the sampling data, the overvoltage and overcurrent data and the set parameter information of the motor train unit into a magnetic disk of an upper computer, and converting the data formats of the sampling data and the overvoltage and overcurrent data;

s2, analyzing the format-converted motor train unit sampling data and the format-converted overvoltage and overcurrent data according to the motor train unit parameter information, and generating an electric energy quality report and an overvoltage and overcurrent report by utilizing a database to complete analysis of motor train unit monitoring data.

In a second aspect, a system for analyzing monitoring data of a motor train unit includes:

the storage subsystem is used for respectively storing the motor train unit sampling data, the overvoltage and overcurrent data and the set motor train unit parameter information into a magnetic disk positioned on the upper computer and converting the data formats of the sampling data and the overvoltage and overcurrent data;

And the analysis subsystem is used for respectively analyzing the format-converted motor train unit sampling data and the format-converted overvoltage and overcurrent data according to the motor train unit parameter information, and generating an electric energy quality report and an overvoltage and overcurrent report by utilizing a database to complete analysis of motor train unit monitoring data.

In a third aspect, the present invention provides an electronic device, including a memory, a processor, and a computer program stored on the memory and running on the processor, where the processor implements the steps of the method for analyzing monitoring data of a motor train unit when executing the computer program.

In a fourth aspect, the present invention provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the method of analyzing motor train unit monitoring data.

The beneficial effects of the invention are as follows:

according to the invention, the sampled data is analyzed and evaluated, the characteristic information of each dimension is extracted, and the characteristic information comprises time domain information, frequency domain information, harmonic wave information and electric energy quality information, so that a set of more perfect electric energy quality analysis and evaluation system is formed; the method analyzes and evaluates the overvoltage and overcurrent data, and comprises time domain analysis, frequency domain analysis and waveform reconstruction analysis, wherein the waveform reconstruction analysis inverts the overvoltage and overcurrent waveform of the primary side of the voltage transformer through the transfer function reconstruction of the voltage transformer, and can truly show the characteristics of the overvoltage and overcurrent waveform of one side of the contact net; the invention generates the electric energy quality report and the overvoltage and overcurrent report by inquiring the electric energy quality and the overvoltage and overcurrent in the database. The invention combines the electric energy quality report, the overvoltage and overcurrent report and the analysis results of the sampling data and the overvoltage and overcurrent data, can efficiently complete the processing analysis of the monitoring data of the motor train unit, and is beneficial to effectively improving the capability of processing the massive monitoring data of the motor train unit.

Drawings

FIG. 1 is a flow chart of the method of the present invention.

Fig. 2 is a flowchart showing the steps of step S2 in the present invention.

FIG. 3 is a flow chart showing the sub-steps of waveform reconstruction in the present invention.

FIG. 4 is a flow chart showing the steps of step A1 in the present invention.

FIG. 5 is a flow chart showing the steps of step A3 according to the present invention.

FIG. 6 is a graph showing the comparison of the reconstruction results in the example of the present invention.

Fig. 7 is a schematic diagram of a system structure according to the present invention.

FIG. 8 is a schematic diagram of an analysis subsystem according to the present invention.

Detailed Description

The following description of the embodiments of the present invention is provided to facilitate understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and all the inventions which make use of the inventive concept are protected by the spirit and scope of the present invention as defined and defined in the appended claims to those skilled in the art.

Those skilled in the art will appreciate that embodiments of the invention may be implemented as a method, system, electronic device, or computer program product, and that the invention may be embodied in the form of: complete hardware, complete software (including firmware, microcode, resident software, etc.), or a combination of hardware and software.

Example 1

Aiming at the defects of the prior art, the invention aims to solve the problems that various factors exist in the prior art in the field of motor train units, a traction network cannot provide good electric energy quality for the motor train units, and the electric energy quality and the overvoltage and overcurrent phenomena cannot be analyzed and evaluated. The invention provides an analysis method based on motor train unit monitoring data, which can analyze sampling data and overvoltage and overcurrent data, as shown in fig. 1, and comprises the following steps of S1-S2:

In the embodiment of the invention, a data disk and an analysis system are built in an upper computer, binary data in the disk are converted into decimal, and then sampling data and overvoltage and overcurrent data stored in the disk are analyzed, wherein the disk is used for storing sampling data files, overvoltage and overcurrent data files, database files and motor train unit configuration files; the analysis system comprises the steps of analyzing the sampling data and the overvoltage and overcurrent data and inquiring the database. According to the invention, firstly, setting parameter information is loaded according to a configuration file, and then sampling analysis, overvoltage data analysis and database query are carried out based on the set parameter information.

In the embodiment of the invention, the data of the disk is converted into: firstly, setting parameter information in a configuration file is acquired, binary data is read through a file path, and then the binary data is converted into decimal data.

In an embodiment of the present invention, analyzing the sampled data includes: time domain analysis, frequency spectrum analysis, harmonic analysis and power quality calculation, wherein the analysis of the overvoltage and overcurrent data comprises the following steps: time domain analysis, frequency domain analysis, waveform reconstruction, and the like.

In the embodiment of the invention, the time domain analysis and the frequency spectrum analysis comprise the amplitude and the frequency of sampling data; the waveform reconstruction analysis carries out reconstruction analysis on the overvoltage and overcurrent data and restores the overvoltage and overcurrent data to the overvoltage and overcurrent data of the primary side of the voltage transformer; the network voltage harmonic analysis comprises fundamental wave, total harmonic content and each subharmonic content of the sampled data, and the network current harmonic analysis comprises the fundamental wave, the total harmonic content and each subharmonic content of the sampled data.

In the embodiment of the invention, data is sampled (400 ms data is adopted for analysis, and the sampling frequency is 20 k), wherein the time domain analysis comprises the following steps: the effective value and the peak value, and displaying the waveform in real time in a graph mode; the frequency domain analysis includes: fourier analysis and graphically displaying the spectral waveforms in real time; the harmonic analysis includes: the total harmonic distortion rate and the contents of each subharmonic are displayed in a histogram mode; the power quality calculation includes: the effective value of the sampling data, the frequency deviation, the voltage flicker, the active power, the reactive power, the power factor and the apparent power are displayed in real time for 1 minute in a graph mode.

In the embodiment of the invention, overvoltage and overcurrent data (200 ms data are adopted for analysis, and the sampling frequency is 10M), wherein the time domain analysis comprises the following steps: the method comprises the steps of displaying an effective value, a peak value, overvoltage and overcurrent duration, the cumulative occurrence times of overvoltage and overcurrent after the system is started and the occurrence time of the overvoltage and overcurrent, and displaying waveforms in real time in a graph mode; the frequency domain analysis includes: fourier analysis and graphically displaying the spectral waveforms in real time; the waveform reconstruction includes: the reconstructed effective value and the reconstructed peak value, and the waveform is displayed in real time in a graph mode.

In the embodiment of the invention, the database inquiry comprises an electric energy quality report and an overvoltage and overcurrent report, wherein the electric energy quality report displays an electric energy quality calculation result, and comprises a sampling data effective value, a sampling data frequency, a frequency deviation, a voltage deviation, voltage flicker, active power, reactive power, a power factor, apparent power, a total harmonic distortion rate and various subharmonic contents; the overvoltage and overcurrent report comprises: serial number, device number, channel number, fault level, status code, peak value of overvoltage and overcurrent, moment of occurrence of overvoltage and overcurrent, and brief description of overvoltage and overcurrent fault.

In the embodiment of the invention, the set motor train unit parameter information comprises: train type, voltage transformer model, sampling frequency, trigger channel, pre-trigger time, trigger total time, and trigger threshold.

In the embodiment of the invention, firstly, setting parameter information including a train type, a transformer model, a sampling frequency, a trigger channel, a pre-trigger time length, a total trigger time length and a trigger threshold value is automatically loaded from a configuration file, then, sampling data, overvoltage data and database data are analyzed according to the parameter information, wherein the sampling data are obtained according to the set motor train unit parameter information, and the train type, the sampling frequency, the voltage transformer transformation ratio, the current transformer transformation ratio and the voltage divider transformation ratio are restored into primary side data of the motor train unit; and acquiring the type of a train, sampling frequency, voltage transformer transformation ratio, current transformer transformation ratio, voltage divider transformation ratio, trigger channel, pre-trigger duration, total trigger duration and trigger threshold value of the overvoltage and overcurrent data according to the set parameter information of the motor train unit, and restoring the overvoltage data to overvoltage data on one side of the motor train unit. And according to the set motor train unit parameter information, the query conditions of the database can be set, and the query of the electric energy quality analysis result and the overvoltage and overcurrent information is carried out.

In the embodiment of the invention, the method and the device can analyze the sampling data and the overvoltage and overcurrent data. Carrying out time domain analysis, frequency domain analysis, harmonic analysis (100 th harmonic can be calculated) and electric energy quality analysis on the sampled data, calculating various parameters such as power, voltage deviation, voltage flicker and the like, and simultaneously displaying various electric energy quality change trends in a form of a graph and a table; and the overvoltage and overcurrent data are reconstructed, the real overvoltage and overcurrent waveform of the primary side of the voltage transformer is inverted, meanwhile, the electric energy quality information and the overvoltage and overcurrent information can be queried through a database, the system is simple to operate, and the data processing performance is good. And (3) according to the calculation result of each parameter of the electric energy quality, giving out the variation trend of each parameter, comparing with the national standard value respectively, grading, and finding out unqualified electric energy quality data. And simultaneously, carrying out time and space association analysis by combining index types, running lines of motor train units, train operation information and fault information, database power quality information, sampling data and overvoltage and overcurrent data in multiple dimensions, predicting the change trend of the power quality, and displaying in a form of a graph and a table.

In the embodiment of the invention, the sampled data is analyzed and evaluated, the characteristic information of each dimension is extracted, and the characteristic information comprises time domain information, frequency domain information, harmonic wave information and electric energy quality information, so that a set of more perfect electric energy quality analysis and evaluation system is formed; the method analyzes and evaluates the overvoltage and overcurrent data, and comprises time domain analysis, frequency domain analysis and waveform reconstruction analysis, wherein the waveform reconstruction analysis inverts the overvoltage and overcurrent waveform of the primary side of the voltage transformer through the transfer function reconstruction of the voltage transformer, and can truly show the characteristics of the overvoltage and overcurrent waveform of one side of the contact net; the invention generates the electric energy quality report and the overvoltage and overcurrent report by inquiring the electric energy quality and the overvoltage and overcurrent in the database. The invention combines the electric energy quality report, the overvoltage and overcurrent report and the analysis results of the sampling data and the overvoltage and overcurrent data, can efficiently complete the processing analysis of the monitoring data of the motor train unit, and is beneficial to effectively improving the capability of processing the massive monitoring data of the motor train unit.

Example 2

As shown in fig. 2, step S2 of embodiment 1 includes the following steps S201 to S204:

s201, loading motor train unit parameter information according to a motor train unit configuration file;

S202, respectively carrying out time domain analysis, frequency spectrum analysis, harmonic analysis and electric energy quality analysis on the sample data subjected to format conversion according to the motor train unit parameter information;

s203, respectively performing time domain analysis, frequency spectrum analysis and waveform reconstruction analysis on the overvoltage and overcurrent data subjected to format conversion according to the motor train unit parameter information;

s204, inquiring overvoltage and overcurrent data in the database according to the parameter information of the motor train unit, generating an overvoltage and overcurrent report, and generating an electric energy quality report according to an electric energy quality analysis result to complete analysis of monitoring data of the motor train unit.

In the embodiment of the invention, the time domain analysis and the frequency spectrum analysis comprise amplitude and frequency analysis of the sampled data, the network voltage harmonic analysis comprises fundamental wave, total harmonic content and each subharmonic content of the sampled data, and the network current harmonic analysis comprises the fundamental wave, the total harmonic content and each subharmonic content of the sampled data.

In the embodiment of the invention, the electric energy quality analysis comprises a network voltage effective value, a network flow effective value, a network voltage frequency, a network flow frequency, a frequency deviation, a voltage deviation, voltage flicker, instantaneous power, active power, reactive power and a power factor of the sampled data.

In the embodiment of the invention, the electric energy quality report is an electric energy quality calculation result, and comprises the following steps: net voltage net current effective value, net voltage net current frequency, frequency deviation, voltage flicker, active power, reactive power, power factor, apparent power, total harmonic distortion rate and content of each subharmonic; the overvoltage and overcurrent report comprises: serial number, device number, channel number, fault level, status code, overvoltage peak value, overvoltage occurrence time, overvoltage fault profile. The report generating process generates a report through a specific database report export statement in the database, wherein the specific database report export statement is a code of the report generated by the database.

In the embodiment of the invention, waveform reconstruction analysis is carried out: acquiring set motor train unit parameter information from the configuration file, and reconstructing the acquired secondary overvoltage data of the voltage transformer according to the set motor train unit parameter information, and restoring the secondary overvoltage data of the voltage transformer into primary overvoltage data.

In the embodiment of the invention, based on the sampling data, the overvoltage and overcurrent data and the database data of the motor train unit, the sampling data and the overvoltage and overcurrent data are respectively analyzed, and the database is inquired. And analyzing the sampled data to obtain the time domain and frequency domain characteristics of the sampled data, and calculating the power quality calculation result. And analyzing the overvoltage and overcurrent data, and reconstructing the primary side voltage of the transformer, namely an overvoltage signal, by utilizing the secondary side voltage of the voltage transformer and the broadband transmission characteristic of the voltage transformer. And inquiring the database to obtain the power quality calculation result information and the overvoltage and overcurrent information. The invention starts from the two aspects of electric energy quality and overvoltage and overcurrent, analyzes the electric energy quality and the overvoltage and overcurrent from multiple dimensions, perfects the data analysis method and the system function of the electric energy quality and the overvoltage and overcurrent of the motor train unit, and provides effective data support and theoretical basis for comprehensive evaluation of the electric energy quality and classification and identification of the overvoltage.

Example 3

The waveform reconstruction analysis in step S203 for embodiment 2 includes the following steps, which include the following sub-steps A1 to A3, as shown in fig. 3:

a1, measuring broadband transmission characteristics of a voltage transformer of the motor train unit;

a2, acquiring the secondary side voltage of the voltage transformer when the motor train unit generates overvoltage and overcurrent according to the parameter information of the motor train unit;

a3, reconstructing to obtain an overvoltage and overcurrent signal of the motor train unit according to the secondary side voltage and the broadband transmission characteristic of the voltage transformer.

According to the embodiment of the invention, based on broadband transmission characteristics of the voltage transformer of the motor train unit, the secondary side voltage of the voltage transformer when overvoltage and overcurrent occur is measured through a sweep frequency method, and the primary side voltage of the transformer, namely an overvoltage and overcurrent signal, is reconstructed by utilizing the secondary side voltage of the voltage transformer and the broadband transmission characteristics of the voltage transformer. The invention starts from the broadband transmission characteristic of the voltage transformer, comprehensively considers the nonlinear characteristic of the voltage transformer at high frequency (relatively 50Hz power frequency), perfects the current method for acquiring the overvoltage and overcurrent data of the motor train unit, can acquire more accurate overvoltage and overcurrent of the motor train unit, and provides effective data support for accurately tracing accidents caused by overvoltage and overcurrent and subsequent accident prevention.

Example 4

For step A1 in example 3, as shown in fig. 4, it includes the following substeps a101 to a106:

a101, generating a single-frequency point sinusoidal signal, and injecting the single-frequency point sinusoidal signal to the primary side of a voltage transformer;

a102, measuring signals of a primary side and a secondary side of the voltage transformer at the same time;

a103, respectively recording the amplitude values and the phase differences of the signals of the primary side and the secondary side of the voltage transformer, wherein the phase differences are the phase frequency characteristics of the single frequency point;

a103, determining the amplitude-frequency characteristic of the voltage transformer at the single frequency point according to the amplitude values of the primary side and the secondary side of the voltage transformer;

a105, changing the frequency of the signal at fixed frequency intervals, judging whether the frequency signal reaches a preset frequency threshold, if so, determining the phase frequency characteristic and amplitude frequency characteristic of the voltage transformer after changing the frequency of the signal, and entering a step A106, otherwise, returning to the step A101;

and A106, combining the amplitude-frequency characteristics and the phase-frequency characteristics of the obtained single frequency points according to the frequency increment sequencing, obtaining the broadband transmission characteristics of the voltage transformer, and entering a step A2.

In the embodiment of the invention, in order to acquire broadband transmission characteristics of the voltage transformer of the motor train unit, sweep frequency measurement is performed.

In the embodiment of the invention, the sweep frequency measurement can be performed by adopting a signal generator and an oscilloscope. Taking the broadband transmission characteristic of the voltage transformer between 1MHz and 5MHz as an example. The single-frequency point sinusoidal signal is generated through the signal generator and is injected into the primary side of the voltage transformer, the signals of the primary side and the secondary side of the voltage transformer are measured simultaneously through the oscilloscope, and the phase frequency characteristic and the amplitude frequency characteristic of the voltage transformer at the single frequency point are determined. Changing the signal frequency at certain frequency intervals, for example, taking 10kHz as intervals, increasing to 5MHz, if the preset frequency threshold is reached, determining the phase frequency characteristic and amplitude frequency characteristic of the voltage transformer after changing the frequency, and combining the amplitude frequency characteristic and the phase frequency characteristic of a plurality of single frequency points between 1MHz and 5MHz according to the frequency increasing sequence to obtain the broadband transmission characteristic H (omega) of the voltage transformer between 1MHz and 5MHz, including the amplitude frequency characteristic A (omega) of the broadband transmission characteristic of the voltage transformer and the phase frequency characteristic phi (omega) of the broadband transmission characteristic of the voltage transformer.

H(ω)＝A(ω)*e ^i*φ(ω)

Wherein H (ω) represents the broadband transmission characteristic of the voltage transformer, A (ω) represents the amplitude-frequency characteristic of the broadband transmission characteristic of the voltage transformer, e represents a natural constant, i represents an imaginary unit, and phi (ω) represents the phase-frequency characteristic of the broadband transmission characteristic of the voltage transformer.

In the embodiment of the invention, the invention can be used forMeasuring signals of the primary side and the secondary side of the voltage transformer simultaneously by using an oscilloscope, and recording amplitude M of the signals of the primary side and the secondary side ₁ and M₂ The amplitude value of the phase difference phi and the phase difference phi are divided (primary side/secondary side) to obtain the amplitude frequency characteristic A of the voltage transformer at the single frequency point, and the phase difference phi (primary side phase minus secondary side phase) is obtained to obtain the phase frequency characteristic of the single frequency point. Namely:

in the embodiment of the invention, the phase frequency characteristic and the amplitude frequency characteristic of a single frequency point are firstly determined, then the signal frequency is changed at certain frequency intervals to obtain the phase frequency characteristic and the amplitude frequency characteristic after the signal frequency is changed, and the amplitude frequency characteristic and the phase frequency characteristic of a plurality of single frequency points are sequentially combined according to the increment of the frequency to obtain more accurate broadband transmission characteristics of the voltage transformer, so that a foundation is provided for the follow-up obtaining of more accurate overvoltage and overcurrent data.

Example 5

For step A3 in example 3, as shown in fig. 5, it includes the following substeps a301 to a304:

a301, performing fast Fourier transform on the secondary side voltage of the voltage transformer to obtain a secondary side frequency domain signal, and converting the secondary side frequency domain signal into a secondary side frequency domain symmetrical signal with zero frequency point symmetry;

A302, supplementing the negative frequency of the broadband transmission characteristic, and performing linear interpolation processing on the supplemented broadband transmission characteristic to obtain a new broadband transmission characteristic;

a303, calculating to obtain a primary side frequency domain signal according to the new broadband transmission characteristic and the secondary side frequency domain symmetrical signal;

a304, carrying out inverse fast Fourier transform on the primary side frequency domain signal, reconstructing to obtain an overvoltage and overcurrent signal, and carrying out smoothing treatment on the reconstructed overvoltage and overcurrent signal to obtain an overvoltage and overcurrent signal of the motor train unit.

In the embodiment of the invention, the secondary side voltage of the voltage transformer when the motor train unit generates overvoltage and overcurrent is measured, and the primary side signal of the voltage transformer is reconstructed by a reconstruction algorithm according to the measured broadband transmission characteristics of the transformer, namely the overvoltage and overcurrent signal. The reconstruction process is as follows:

(1) The secondary side voltage V measured at a certain sampling frequency ₂ (t) and storing, performing fast Fourier transform (fft) on the secondary side voltage to obtain a secondary side frequency domain signal V ₂ And (omega) converting the frequency domain signal at the moment into data symmetrical about a zero frequency point, wherein the data comprises amplitude-frequency characteristics Mag (omega) of a secondary side frequency domain symmetrical signal and phase-frequency characteristics Pha (omega) of the secondary side frequency domain symmetrical signal, and the sampling frequency is not more than the maximum signal frequency for acquiring broadband transmission characteristics in the step S1.

(2) The broadband transmission characteristics obtained through measurement are supplemented with a negative frequency part, so that the frequency distribution is symmetrical about a zero frequency point, the amplitude frequency characteristics of the negative frequency and the positive frequency are equal, and the phase frequency characteristics are opposite. Linear interpolation is carried out on the broadband transmission characteristic after the negative frequency is supplemented, the frequency interval is ensured to be the same as the frequency interval, and finally a new broadband transmission characteristic H is obtained ₁ (omega) amplitude-frequency characteristic A comprising a new broadband transfer characteristic ₁ (omega) and phase frequency characteristics phi of new broadband transfer characteristics ₁ (ω)。

(3) Multiplying the symmetric signal of the secondary side frequency domain with the broadband transmission characteristic, namely multiplying the amplitude-frequency characteristic and adding the phase-frequency characteristic to obtain a primary side frequency domain signal V ₁ (omega). Performing inverse fast Fourier transform (ifft) on the obtained primary side frequency domain signal to obtain a primary side time domain signal V ₁ And (t) reconstructing the obtained overvoltage and overcurrent signals.

(4) And carrying out smoothing treatment on the reconstructed overvoltage and overcurrent signals by using a smoothing algorithm, eliminating data oscillation, and finally obtaining the overvoltage and overcurrent signals of the motor train unit.

In an embodiment of the present invention, the smoothing algorithm includes, but is not limited to, a moving smoothing algorithm, a partial regression smoothing algorithm, a partial weighted regression smoothing algorithm, an SG smoothing algorithm, a robust partial regression smoothing algorithm, or a robust partial weighted regression smoothing algorithm.

In the embodiment of the invention, the reconstruction process comprises fast Fourier transform and inverse fast Fourier transform, the acquired secondary side voltage signal when overvoltage and overcurrent occur is subjected to fast Fourier transform to obtain a secondary side frequency domain signal, the secondary side frequency domain signal is multiplied by broadband transfer characteristics, namely amplitude multiplication and phase addition are carried out to obtain an overvoltage and overcurrent frequency domain signal, and finally the overvoltage and overcurrent (time domain) data are obtained by carrying out inverse fast Fourier transform and smoothing treatment on the overvoltage and overcurrent frequency domain signal.

In the embodiment of the invention, fig. 6 shows the reconstruction result in the embodiment, and the reconstruction result is basically consistent with the actual result, so that the defect of the existing method for acquiring the overvoltage and overcurrent of the motor train unit is effectively overcome.

According to the embodiment of the invention, the primary side voltage, namely the overvoltage and overcurrent, is obtained by utilizing a reconstruction algorithm according to the secondary side voltage of the voltage transformer and the broadband transmission characteristic of the transformer when the overvoltage and overcurrent occur, so that the defect that the current method for obtaining the overvoltage and overcurrent cannot consider the transmission characteristic of the transformer in the broadband is overcome, and the accuracy of the obtained overvoltage and overcurrent data is effectively improved.

Example 6

For example 5, the expression for the reconstructed overvoltage and overcurrent signal is as follows:

V ₁ (t)＝ifft(V ₁ (ω))

V ₂ (ω)＝fft(V ₂ (t))＝Mag(ω)*e ^i*Pha(ω)

wherein ,V₁ (t) denotes the reconstructed over-voltage and over-current signal, ifft (·) denotes the inverse fast Fourier transform, V ₁ (ω) represents the primary side frequency domain signal, V ₂ (omega) represents a symmetric signal in the secondary side frequency domain, H ₁ (omega) represents a newBroadband transmission characteristics, mag (ω) represents the amplitude-frequency characteristic of the secondary-side frequency domain symmetric signal, A ₁ (omega) represents the amplitude-frequency characteristic of the new broadband transmission characteristic, e represents a natural constant, i represents an imaginary unit, pha (omega) represents the phase-frequency characteristic of the secondary side-frequency domain symmetric signal, and phi ₁ (ω) phase-frequency characteristics of the new broadband transfer characteristic, fft (·) fast Fourier transform, V ₂ (t) represents the secondary side voltage measured at a fixed frequency.

In the embodiment of the invention, the primary side voltage, namely the overvoltage and overcurrent is obtained by utilizing a reconstruction algorithm according to the secondary side voltage of the voltage transformer and the broadband transmission characteristic of the voltage transformer when the overvoltage and overcurrent occur. The method overcomes the defect that the current method for acquiring the overvoltage and overcurrent cannot consider the transmission characteristic of the voltage transformer in a broadband, effectively improves the accuracy of the acquired overvoltage and overcurrent data, and simultaneously considers the transmission characteristic of the voltage transformer in the broadband to acquire more accurate overvoltage and overcurrent data, and provides effective data support for accurately tracing accidents caused by overvoltage and overcurrent and subsequent accident prevention.

In summary, according to the analysis system for monitoring data of the motor train unit in the embodiment of the invention, firstly, sampled data are analyzed and evaluated, characteristic information of each dimension is extracted, and the characteristic information comprises time domain information, frequency domain information, harmonic wave information and electric energy quality information, so that a set of relatively perfect electric energy quality analysis and evaluation system is formed; secondly, the method analyzes and evaluates the overvoltage and overcurrent data, including time domain analysis, frequency domain analysis and waveform reconstruction analysis, wherein the waveform reconstruction analysis inverts the overvoltage and overcurrent waveform of the primary side of the voltage transformer through the transfer function reconstruction of the voltage transformer, and can truly show the overvoltage and overcurrent waveform characteristics of one side of the contact net, namely, the waveform reconstruction analysis obtains the primary side voltage, namely, overvoltage and overcurrent, according to the voltage of the secondary side of the voltage transformer and the broadband transfer characteristics of the transformer when overvoltage and overcurrent occur, and the waveform reconstruction method utilizes a reconstruction algorithm to obtain the primary side voltage, namely, the overvoltage and overcurrent, so that the defect that the transfer characteristics of the transformer in the broadband cannot be considered in the current overvoltage and overcurrent obtaining method is overcome, the accuracy of the obtained overvoltage and overcurrent data is effectively improved, and meanwhile, the transfer characteristics in the broadband of the voltage transformer are considered, so that more accurate overvoltage and overcurrent data are obtained, and effective data support is provided for accurate source and subsequent accident tracing prevention caused by the overvoltage and overcurrent; furthermore, the invention generates the electric energy quality report and the overvoltage and overcurrent report by inquiring the electric energy quality and the overvoltage and overcurrent in the database. The invention combines the electric energy quality report, the overvoltage and overcurrent report and the analysis results of the sampling data and the overvoltage and overcurrent data, can efficiently complete the processing analysis of the monitoring data of the motor train unit, and is beneficial to effectively improving the capability of processing the massive monitoring data of the motor train unit.

Example 7

Based on the same inventive concept, the embodiment of the invention also provides a system for analyzing the monitoring data of the motor train unit, and because the principle solved by the system is similar to that of the analysis method of the monitoring data of the motor train unit, the implementation of the system can be referred to the implementation of the method, and the repetition is omitted.

Fig. 7 is a block diagram of a system for analyzing monitoring data of a motor train unit according to an embodiment of the present invention, and as shown in fig. 7, the system for analyzing monitoring data of a motor train unit includes:

In one embodiment, as shown in fig. 8, the analysis subsystem includes:

the parameter loading module is used for loading the motor train unit parameter information according to the motor train unit configuration file;

The first analysis module is used for respectively carrying out time domain analysis, frequency spectrum analysis, harmonic analysis and electric energy quality analysis on the sample data subjected to format conversion according to the motor train unit parameter information;

the second analysis module is used for respectively carrying out time domain analysis, frequency spectrum analysis and waveform reconstruction analysis on the overvoltage and overcurrent data subjected to format conversion according to the motor train unit parameter information;

and the database query module is used for querying the overvoltage and overcurrent data in the database according to the parameter information of the motor train unit, generating an overvoltage and overcurrent report, and generating an electric energy quality report according to an electric energy quality analysis result to complete analysis of the monitoring data of the motor train unit.

In one embodiment, the second analysis module includes:

the time domain analysis sub-module is used for carrying out amplitude analysis on the overvoltage and overcurrent data subjected to format conversion according to the parameter information of the motor train unit;

the frequency spectrum analysis sub-module is used for carrying out frequency analysis on the overvoltage and overcurrent data subjected to format conversion according to the parameter information of the motor train unit;

and the reconstruction sub-module is used for carrying out reconstruction analysis on the overvoltage and overcurrent data of the motor train unit according to the parameter information of the motor train unit to obtain an overvoltage and overcurrent signal of the motor train unit.

In one embodiment, the reconstruction submodule includes:

the measuring unit is used for measuring broadband transmission characteristics of the voltage transformer of the motor train unit;

the acquisition unit is used for acquiring the secondary side voltage of the voltage transformer when the motor train unit generates overvoltage and overcurrent according to the parameter information of the motor train unit;

and the reconstruction unit is used for reconstructing and obtaining an overvoltage and overcurrent signal of the motor train unit according to the secondary side voltage and the broadband transmission characteristic of the voltage transformer.

In one embodiment, the measurement unit comprises:

the signal generation subunit is used for generating a single-frequency point sinusoidal signal and injecting the single-frequency point sinusoidal signal to the primary side of the voltage transformer;

the first calculating subunit is used for measuring signals of the primary side and the secondary side of the voltage transformer at the same time;

the second calculating subunit is used for respectively recording the amplitude values and the phase differences of the signals of the primary side and the secondary side of the voltage transformer, wherein the phase differences are the phase frequency characteristics of the single frequency point;

the third calculation subunit is used for determining the amplitude-frequency characteristic of the voltage transformer at the single frequency point according to the amplitude values of the primary side and the secondary side of the voltage transformer;

the judging subunit is used for changing the signal frequency at fixed frequency intervals, judging whether the signal frequency reaches a preset frequency threshold, if so, determining the phase frequency characteristic and amplitude frequency characteristic of the voltage transformer after changing the signal frequency, and if not, continuing iteration;

And the broadband transmission characteristic determining subunit is used for combining the obtained amplitude-frequency characteristics and the obtained phase-frequency characteristics of the single frequency points according to the frequency increment sequencing to obtain the broadband transmission characteristic of the voltage transformer.

In one embodiment, the reconstruction unit includes:

the fourth calculation subunit is used for carrying out fast Fourier transform on the secondary side voltage of the voltage transformer to obtain a secondary side frequency domain signal, and converting the secondary side frequency domain signal into a secondary side frequency domain symmetrical signal with zero frequency point symmetry;

a fifth calculation subunit, configured to supplement the negative frequency of the broadband transmission feature, and perform linear interpolation processing on the broadband transmission feature after supplement, so as to obtain a new broadband transmission feature;

a sixth calculating subunit, configured to calculate, according to the new wideband transmission characteristic and the secondary side frequency domain symmetric signal, a primary side frequency domain signal;

and the seventh calculation subunit is used for carrying out inverse fast Fourier transform on the primary side frequency domain signal, reconstructing to obtain an overvoltage and overcurrent signal, and carrying out smoothing treatment on the reconstructed overvoltage and overcurrent signal to obtain an overvoltage and overcurrent signal of the motor train unit.

In one embodiment, the expression of the reconstructed overvoltage and overcurrent signal is as follows:

V ₁ (t)＝ifft(V ₁ (ω))

V ₂ (ω)＝fft(V ₂ (t))＝Mag(ω)*e ^i*Pha(ω)

wherein ,V₁ (t) denotes the reconstructed over-voltage and over-current signal, ifft (·) denotes the inverse fast Fourier transform, V ₁ (ω) represents the primary side frequency domain signal, V ₂ (omega) represents a symmetric signal in the secondary side frequency domain, H ₁ (ω) represents a new broadband transmission characteristic, mag (ω) represents an amplitude-frequency characteristic of the secondary side-frequency domain symmetric signal, A ₁ (omega) represents the amplitude-frequency characteristic of the new broadband transmission characteristic, e represents a natural constant, i represents an imaginary unit, pha (omega) represents the phase-frequency characteristic of the secondary side-frequency domain symmetric signal, and phi ₁ (ω) phase-frequency characteristics of the new broadband transfer characteristic, fft (·) fast Fourier transform, V ₂ (t) represents the secondary side voltage measured at a fixed frequency.

In the embodiment of the invention, the functional units can be divided according to the analysis system method of the monitoring data of the motor train unit, for example, each function can be divided into each functional unit, and two or more functions can be integrated in one processing unit. The integrated units may be implemented in hardware or in software functional units. It should be noted that the division of the units in the present invention is schematic, only one logic division, and other division manners may be implemented in practice.

In the embodiment of the invention, in order to realize the principle and beneficial effects of the analysis method of the motor train unit monitoring data, the analysis system of the motor train unit monitoring data comprises a hardware structure and/or a software module for executing corresponding functions. Those of skill in the art will readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein are capable of being implemented as a combination of hardware and/or hardware and computer software, where a function is performed in either a hardware or a computer software driven manner, where different methods may be employed to implement the described functions for each particular application depending upon the specific application and design constraints, but such implementation is not to be considered beyond the scope of the present application.

Example 8

The embodiment of the invention provides electronic equipment, which comprises a memory, a processor and a computer program stored on the memory and running on the processor, wherein the steps of the analysis method of the motor train unit monitoring data in any one of embodiments 1 to 6 are realized when the processor executes the computer program. For example: the processor, when executing the computer program, may implement the following:

In an embodiment of the present invention, an electronic device may include: the system comprises a processor, a memory, a bus and a communication interface, wherein the processor, the communication interface and the memory are connected through the bus, a computer program capable of running on the processor is stored in the memory, and when the processor runs the computer program, part or all of the steps of the analysis method for the monitoring data of the motor train unit provided in any one of the embodiments 1 to 6 are executed.

Example 9

An embodiment of the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method for analyzing motor train unit monitoring data of any one of embodiments 1 to 6. For example: the processor, when executing the computer program, may implement the following:

The above-described computer-readable storage media can be implemented in any type or combination of volatile or nonvolatile memory devices such as Static Random Access Memory (SRAM), erasable programmable and read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk, and can be any available media that can be accessed by a general purpose or special purpose computer. The readable storage medium is coupled to the processor such that the processor can read information from, and write information to, the readable storage medium, which may also be part of the processor, the processor and the readable storage medium may be located in an Application Specific Integrated Circuit (ASIC), and the processor and the readable storage medium may also be present as discrete components in an analysis system for the motor train unit monitoring data.

Embodiments of the invention may be provided as a method, apparatus, or computer program product, and therefore, the invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The methods, apparatus (means), and computer program products according to embodiments of the present invention are described with reference to flow diagrams and/or block diagrams, it being understood that each flow diagram and/or block diagram, and combinations of flow diagrams and/or block diagrams, can be implemented by computer program instructions that can be provided in a computer-readable memory of a general purpose computer, special purpose computer, embedded computer, or other programmable data processing apparatus, operating in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flow diagram flow or flows and/or block diagram block or blocks. These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart and/or block diagram block or blocks.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The analysis method of the monitoring data of the motor train unit is characterized by comprising the following steps of:

s2, analyzing the format-converted motor train unit sampling data and the format-converted overvoltage and overcurrent data according to the motor train unit parameter information, and generating an electric energy quality report and an overvoltage and overcurrent report by utilizing a database to complete analysis of motor train unit monitoring data;

the step S2 includes the steps of:

s204, inquiring overvoltage and overcurrent data in a database according to the parameter information of the motor train unit, generating an overvoltage and overcurrent report, and generating an electric energy quality report according to an electric energy quality analysis result to complete analysis of monitoring data of the motor train unit;

the waveform reconstruction analysis in step S203 includes the steps of:

the step A1 comprises the following steps:

a105, changing the signal frequency at fixed frequency intervals, judging whether the signal frequency reaches a preset frequency threshold, if so, determining the phase frequency characteristic and amplitude frequency characteristic of the voltage transformer after changing the signal frequency, and entering a step A106, otherwise, returning to the step A101;

A106, combining the amplitude-frequency characteristics and the phase-frequency characteristics of the obtained single frequency points according to the frequency increment sequencing to obtain broadband transmission characteristics of the voltage transformer, and entering a step A2;

a3, reconstructing to obtain an overvoltage and overcurrent signal of the motor train unit according to the secondary side voltage of the voltage transformer and the new broadband transmission characteristic;

the step A3 comprises the following steps:

2. The method for analyzing monitoring data of a motor train unit according to claim 1, wherein the expression of the reconstructed overvoltage and overcurrent signals is as follows:

wherein ,

representing a reconstructed overvoltage/overcurrent signal, +.>

Representing the inverse fast fourier transform, ">

Representing the primary side frequency domain signal,/->

Representing the symmetric signal of the secondary side frequency domain, +.>

Representing a new broadband transfer characteristic, +.>

Representing the amplitude-frequency characteristic of the symmetric signal of the secondary side frequency domain, < >>

Amplitude-frequency characteristic representing new broadband transmission characteristics, < ->

Representing natural constant->

Representing imaginary units, ++>

Representing the phase-frequency characteristics of the secondary side-frequency domain symmetric signal,/->

Phase frequency characteristic representing new broadband transmission characteristics, +.>

Representing the fast fourier transform, ">

The secondary side voltage measured at a fixed frequency is shown.

3. An analysis system for monitoring data of a motor train unit, which is characterized in that the analysis system is located in an upper computer and comprises:

the analysis subsystem is used for respectively analyzing the format-converted motor train unit sampling data and the format-converted overvoltage and overcurrent data according to the motor train unit parameter information, and generating an electric energy quality report and an overvoltage and overcurrent report by utilizing a database to complete analysis of motor train unit monitoring data;

The analysis subsystem includes:

the second analysis module includes:

the reconstruction sub-module is used for carrying out reconstruction analysis on the overvoltage and overcurrent data of the motor train unit according to the parameter information of the motor train unit to obtain an overvoltage and overcurrent signal of the motor train unit;

the reconstruction submodule includes:

the measuring unit includes:

the broadband transmission characteristic determining subunit is used for combining the obtained amplitude-frequency characteristics and the obtained phase-frequency characteristics of the single frequency points according to the frequency increment sequencing to obtain broadband transmission characteristics of the voltage transformer;

the reconstruction unit is used for reconstructing and obtaining an overvoltage and overcurrent signal of the motor train unit according to the secondary side voltage of the voltage transformer and the new broadband transmission characteristic;

The reconstruction unit includes:

the seventh calculation subunit is used for carrying out inverse fast Fourier transform on the primary side frequency domain signal, reconstructing to obtain an overvoltage and overcurrent signal, and carrying out smoothing treatment on the reconstructed overvoltage and overcurrent signal to obtain an overvoltage and overcurrent signal of the motor train unit; and the database query module is used for querying the overvoltage and overcurrent data in the database according to the parameter information of the motor train unit, generating an overvoltage and overcurrent report, and generating an electric energy quality report according to an electric energy quality analysis result to complete analysis of the monitoring data of the motor train unit.

4. A system for analyzing monitoring data of a motor train unit according to claim 3, wherein the expression of the reconstructed overvoltage/overcurrent signal is as follows:

wherein ,

representing a reconstructed overvoltage/overcurrent signal, +.>

Representing the inverse fast fourier transform, ">

Representing the primary side frequency domain signal,/->

Representing the symmetric signal of the secondary side frequency domain, +.>

Representing a new broadband transfer characteristic, +.>

Representation ofNatural constant (I/O)>

Representing imaginary units, ++>

Representing the fast fourier transform, ">

The secondary side voltage measured at a fixed frequency is shown.

5. An electronic device comprising a memory, a processor and a computer program stored on the memory and running on the processor, characterized in that the processor implements the steps of the method for analyzing motor train unit monitoring data according to any one of claims 1 to 2 when executing the computer program.

6. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the steps of the method of analyzing motor train unit monitoring data as claimed in any one of claims 1 to 2.