Method, System, Electronic Device and Storage Medium for Obtaining Overvoltage Signals of Multiple Unit Trains

Abstract

The present invention discloses a method, a system, an electronic device and a storage medium for obtaining overvoltage signals of a multiple unit train, belonging to the technical field of multiple unit trains. Based on the broadband transmission characteristics of the voltage transformer of the multiple unit train, by measuring the voltage on the secondary side of the voltage transformer when overvoltage occurs, and using the voltage on the secondary side and the broadband transmission characteristics of the voltage transformer, the voltage on the primary side of the voltage transformer, that is, the overvoltage signal, is reconstructed. Through the above design, the present invention can obtain more accurate overvoltage data, providing effective data support for accurately tracing the origin of accidents caused by overvoltage and subsequent accident prevention.

Description

Technical Field

[0001] The present invention belongs to the technical field of multiple unit trains, and particularly relates to a method, a system, an electronic device and a storage medium for obtaining overvoltage signals of multiple unit trains. Background Art

[0002] The voltage transformer is an important component in the high-voltage power transmission control of multiple unit trains, and is used for metering protection, power measurement and catenary voltage measurement, playing an important role in the entire high-voltage system. However, in recent years, voltage transformer failures have occurred from time to time. The main reasons for these accidents are various overvoltage phenomena generated during the running of multiple unit trains, such as overvoltage during phase separation, overvoltage during closing and opening of VCB, overvoltage during pantograph raising and lowering, etc.

[0003] In order to prevent transformer accidents and trace the origin of accidents, it is usually necessary to monitor the high-voltage side voltage (i.e., overvoltage) of the voltage transformer. However, since the high-voltage side voltage of the voltage transformer is the catenary voltage, the voltage amplitude is very large, usually up to dozens of kilovolts or even hundreds of kilovolts. It is very difficult to directly measure the high-voltage side voltage on the vehicle and it is not easy to achieve. The current main method is to measure the low-voltage side voltage of the voltage transformer and then determine the high-voltage side voltage according to the rated transformation ratio of the transformer. However, when overvoltage occurs in multiple unit trains, there will be high-frequency components (relative to the power frequency of 50 Hz) in the high-voltage side voltage signal, and the voltage transformer may exhibit non-linear characteristics, making it difficult to obtain accurate overvoltage signals. In order to accurately trace the origin of accidents, obtaining accurate overvoltage signals is an urgent problem to be solved at present. Summary of the Invention

[0004] Aiming at the above deficiencies in the prior art, the present invention provides a method, a system, an electronic device and a storage medium for obtaining overvoltage signals of multiple unit trains, so as to be able to obtain more accurate overvoltage data, provide effective data support for accurately tracing the origin of accidents caused by overvoltage and subsequent accident prevention.

[0005] In order to achieve the above invention purpose, on the one hand, the present invention provides a method for obtaining overvoltage signals of multiple unit trains, including the following steps:

[0006] S1. Measure the broadband transfer characteristics of the voltage transformer of the multiple unit train;

[0007] S2. Collect the voltage on the secondary side of the voltage transformer when overvoltage occurs in the multiple unit train;

[0008] S3. Reconstruct the overvoltage signal of the multiple unit train according to the voltage on the secondary side of the voltage transformer and the broadband transfer characteristics.

[0009] On the second aspect, the present invention provides a system for obtaining overvoltage signals of multiple unit trains, including:

[0010] A measurement module, configured to measure the broadband transfer characteristics of the voltage transformer of the multiple unit train;

[0011] An acquisition module, configured to acquire the secondary side voltage of the voltage transformer when overvoltage occurs in the multiple unit train;

[0012] A reconstruction module, configured to reconstruct the overvoltage signal of the multiple unit train according to the secondary side voltage of the voltage transformer and the broadband transfer characteristics.

[0013] 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. When the processor executes the computer program, the steps of the method for obtaining the overvoltage signal of the multiple unit train are implemented.

[0014] In a fourth aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method for obtaining the overvoltage signal of the multiple unit train are implemented.

[0015] The beneficial effects of the present invention are as follows: Based on the broadband transfer characteristics of the voltage transformer of the multiple unit train, by measuring the secondary side voltage of the voltage transformer when overvoltage occurs, and using the secondary side voltage and the broadband transfer characteristics of the voltage transformer, the primary side voltage of the voltage transformer, that is, the overvoltage signal, is reconstructed. Through the above design, the present invention can obtain more accurate overvoltage data, providing effective data support for accurately tracing the cause of accidents caused by overvoltage and subsequent accident prevention. Description of the Drawings

[0016] Figure 1 It is a flowchart of the method of the present invention.

[0017] Figure 2 It is a flowchart of the sub-steps of step S1 in the present invention.

[0018] Figure 3 It is a flowchart of the sub-steps of step S102 in the present invention.

[0019] Figure 4 It is a flowchart of the sub-steps of step S3 in the present invention.

[0020] Figure 5 It is a comparison diagram of the reconstruction results in this embodiment.

[0021] Figure 6 It is a schematic structural diagram of the system of the present invention. Detailed Embodiments

[0022] The specific embodiments of the present invention will be described below to facilitate those skilled in the art to understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions created using the concept of the present invention are within the scope of protection.

[0023] Those skilled in the art know that the embodiments of the present invention can implement a method, a system, an electronic device or a computer program product. Therefore, the present invention can be specifically implemented in the following forms, namely: completely hardware, completely software (including firmware, microcode, resident software, etc.), or a combination of hardware and software.

[0024] Embodiment 1

[0025] Based on the current method for obtaining overvoltage of EMUs, that is, multiplying the rated transformation ratio of the voltage transformer by the secondary side voltage. Due to the high-frequency components contained in the voltage signal during overvoltage, problems such as inaccurate obtained overvoltage data occur. An embodiment of the present invention provides a method for obtaining overvoltage signals of EMUs, as Figure 1 shown, including steps S1 to S3:

[0026] S1. Measure the broadband transfer characteristics of the voltage transformer of the EMU;

[0027] S2. Collect the secondary side voltage of the voltage transformer when overvoltage occurs in the EMU;

[0028] S3. Reconstruct the overvoltage signal of the EMU according to the secondary side voltage of the voltage transformer and the broadband transfer characteristics.

[0029] In the embodiment of the present invention, based on the broadband transfer characteristics of the voltage transformer of the EMU, the secondary side voltage of the voltage transformer when overvoltage occurs is measured by the frequency sweep method. Using the secondary side voltage of the voltage transformer and the broadband transfer characteristics of the voltage transformer, the primary side voltage of the transformer, that is, the overvoltage signal, is reconstructed. Starting from the broadband transfer characteristics of the voltage transformer, the present invention comprehensively considers the non-linear characteristics of the voltage transformer at high frequencies (relative to the 50 Hz power frequency), improves the current method for obtaining overvoltage data of EMUs, can obtain more accurate overvoltage of EMUs, and provides effective data support for accurately tracing the accidents caused by overvoltage and subsequent accident prevention.

[0030] Embodiment 2

[0031] Regarding step S1 of Embodiment 1, as Figure 2 shown, it includes the following sub-steps S101 to S104:

[0032] S101. Generate a single-frequency sine signal and inject the single-frequency sine signal into the primary side of the voltage transformer;

[0033] S102. Measure the signals on the primary side and secondary side of the voltage transformer simultaneously, and determine the phase-frequency characteristic and amplitude-frequency characteristic of the voltage transformer at this single frequency according to the signals on the primary side and secondary side of the voltage transformer;

[0034] S103. Change the signal frequency at a fixed frequency interval, and determine whether the frequency signal reaches a preset frequency threshold. If so, determine the phase-frequency characteristic and amplitude-frequency characteristic of the voltage transformer after changing the signal frequency, and enter step S104. Otherwise, return to step S101;

[0035] S104. Combine the amplitude-frequency characteristics and phase-frequency characteristics of multiple single frequencies obtained in step S102 and step S103 in ascending order according to the frequency, obtain the wide-band transfer characteristic of the voltage transformer, and enter step S2.

[0036] In the embodiment of the present invention, in order to obtain the wide-band transfer characteristic of the voltage transformer of the EMU, a frequency sweep measurement is performed.

[0037] In the embodiment of the present invention, a signal generator and an oscilloscope can be used for frequency sweep measurement. Taking the example of obtaining the wide-band transfer characteristic of the voltage transformer between 1 MHz and 5 MHz of the voltage transformer. A single-frequency sine signal is generated by the signal generator and injected into the primary side of the voltage transformer. The oscilloscope is used to measure the signals on the primary side and secondary side of the voltage transformer simultaneously to determine the phase-frequency characteristic and amplitude-frequency characteristic of the voltage transformer at this single frequency. The signal frequency is changed at a certain frequency interval, such as at an interval of 10 kHz, and increased to 5 MHz to end. If the preset frequency threshold is reached, the phase-frequency characteristic and amplitude-frequency characteristic of the voltage transformer after changing the frequency are determined, and the amplitude-frequency characteristics and phase-frequency characteristics of multiple single frequencies between 1 MHz and 5 MHz are combined in ascending order according to the frequency to obtain the wide-band transfer characteristic H(ω) of the voltage transformer between 1 MHz and 5 MHz of the voltage transformer, including the amplitude-frequency characteristic A(ω) of the wide-band transfer characteristic of the voltage transformer and the phase-frequency characteristic φ(ω) of the wide-band transfer characteristic of the voltage transformer.

[0038] H(ω) = A(ω) * e i*φ(ω)

[0039] Among them, H(ω) represents the wide-band transfer characteristic of the voltage transformer, A(ω) represents the amplitude-frequency characteristic of the wide-band transfer characteristic of the voltage transformer, e represents the natural constant, i represents the imaginary unit, and φ(ω) represents the phase-frequency characteristic of the wide-band transfer characteristic of the voltage transformer.

[0040] In the embodiment of the present invention, the present invention first determines the phase-frequency characteristic and amplitude-frequency characteristic of a single frequency point, then changes the signal frequency at a certain frequency interval to obtain the phase-frequency characteristic and amplitude-frequency characteristic after changing the signal frequency, and sorts and combines the amplitude-frequency characteristics and phase-frequency characteristics of multiple single frequency points in ascending order of frequency to obtain a more accurate broadband transfer characteristic of the voltage transformer, providing a basis for obtaining more accurate overvoltage data subsequently.

[0041] Embodiment 3

[0042] Regarding step S102 in Embodiment 2, as Figure 3 shown, it includes the following sub-steps S1021 to S1023:

[0043] S1021. Measure the signals on the primary side and secondary side of the voltage transformer simultaneously;

[0044] S1022. Record the amplitudes and phase differences of the signals on the primary side and secondary side of the voltage transformer respectively, where the phase difference is the phase-frequency characteristic of this single frequency point;

[0045] S1023. Determine the amplitude-frequency characteristic of the voltage transformer at this single frequency point according to the amplitudes on the primary side and secondary side of the voltage transformer.

[0046] In the embodiment of the present invention, the present invention can use an oscilloscope to measure the signals on the primary side and secondary side of the voltage transformer simultaneously, and record the amplitudes M 1 and M 2 , and the phase difference φ. The division of the two amplitudes (primary side / secondary side) is the amplitude-frequency characteristic A of the voltage transformer at this single frequency point, and the phase difference φ (primary side phase minus secondary side phase) is the phase-frequency characteristic of this single frequency point. That is:

[0047]

[0048] In the embodiment of the present invention, the present invention determines the amplitude-frequency characteristic and phase-frequency characteristic of the voltage transformer at a single frequency point by measuring the signals on the primary side and secondary side of the voltage transformer simultaneously, providing a basis for subsequent measurement of the broadband transfer characteristic of the EMU voltage transformer.

[0049] Embodiment 4

[0050] Regarding step S3 in Embodiment 1, as Figure 4 shown, it includes the following sub-steps S301 to S304:

[0051] S301. Perform a fast Fourier transform on the voltage on the secondary side of the voltage transformer to obtain the secondary side frequency domain signal, and convert the secondary side frequency domain signal into a secondary side frequency domain symmetric signal symmetric about the zero frequency point;

[0052] S302. Supplement the negative frequencies of the broadband transfer characteristics, and perform linear interpolation on the supplemented broadband transfer characteristics to obtain new broadband transfer characteristics;

[0053] S303. Calculate the primary-side frequency-domain signal based on the new broadband transfer characteristics and the secondary-side frequency-domain symmetric signal;

[0054] S304. Perform inverse fast Fourier transform on the primary-side frequency-domain signal to reconstruct the overvoltage signal, and perform smoothing processing on the reconstructed overvoltage signal to complete the acquisition of the overvoltage signal of the EMU.

[0055] In the embodiment of the present invention, the secondary-side voltage of the voltage transformer when the EMU has an overvoltage is measured. According to the broadband transfer characteristics of the transformer already measured above, the primary-side signal of the voltage transformer is reconstructed by using the reconstruction algorithm, which is the overvoltage signal. The reconstruction process is as follows:

[0056] (1) Measure the secondary-side voltage V 2 (t) at a certain sampling frequency and save it. Perform fast Fourier transform (fft) on the secondary-side voltage to obtain the secondary-side frequency-domain signal V 2 (ω). Convert the frequency-domain signal at this time into data symmetric about the zero-frequency point, including the amplitude-frequency characteristic Mag(ω) of the secondary-side frequency-domain symmetric signal and the phase-frequency characteristic Pha(ω) of the secondary-side frequency-domain symmetric signal, where the sampling frequency is not greater than the maximum signal frequency for obtaining the broadband transfer characteristics in step S1.

[0057] (2) Supplement the negative-frequency part of the measured broadband transfer characteristics to ensure that the frequency distribution is symmetric about the zero-frequency point, the amplitude-frequency characteristics of the negative frequencies and the positive frequencies are equal, and the phase-frequency characteristics are opposite. Perform linear interpolation on the broadband transfer characteristics after supplementing the negative frequencies to ensure that the frequency intervals are the same, and finally obtain the new broadband transfer characteristics H 1 (ω), including the amplitude-frequency characteristic A 1 (ω) and the phase-frequency characteristic φ 1 (ω) of the new broadband transfer characteristics.

[0058] (3) Multiply the secondary-side frequency-domain symmetric signal by the broadband transfer characteristics, that is, multiply the amplitude-frequency characteristics and add the phase-frequency characteristics, to obtain the primary-side frequency-domain signal V 1 (ω). Perform inverse fast Fourier transform (ifft) on the obtained primary-side frequency-domain signal to obtain the primary-side time-domain signal V 1 (t), which is the reconstructed overvoltage signal.

[0059] (4) The reconstructed overvoltage signal is further smoothed using a smoothing algorithm to eliminate data oscillations, and finally the overvoltage signal of the EMU is obtained.

[0060] In the embodiments of the present invention, the smoothing algorithm includes, but is not limited to, the moving smoothing algorithm, the local regression smoothing algorithm, the locally weighted regression smoothing algorithm, the SG smoothing algorithm, the robust local regression smoothing algorithm, or the robust locally weighted regression smoothing algorithm.

[0061] In the embodiments of the present invention, the reconstruction process includes the fast Fourier transform and the inverse fast Fourier transform. The secondary side voltage signal collected when the overvoltage occurs is subjected to the fast Fourier transform to obtain the secondary side frequency domain signal. The secondary side frequency domain signal is multiplied by the broadband transfer characteristic, that is, the amplitude is multiplied and the phase is added to obtain the overvoltage frequency domain signal. Finally, the overvoltage frequency domain signal is subjected to the inverse fast Fourier transform and smoothing processing to obtain the overvoltage (time domain) data.

[0062] In the embodiments of the present invention, Figure 5 For the reconstruction result in the embodiment, the reconstruction result is basically consistent with the actual result, effectively improving the defects of the current method for obtaining the overvoltage of the EMU.

[0063] In the embodiments of the present invention, according to the secondary side voltage of the voltage transformer and the broadband transfer characteristic of the transformer when the overvoltage occurs, the primary side voltage, that is, the overvoltage, is obtained using the reconstruction algorithm, making up for the defect that the current method for obtaining the overvoltage cannot consider the transfer characteristic of the transformer within the broadband, and effectively improving the accuracy of the obtained overvoltage data.

[0064] Embodiment 5

[0065] For step S304 in Embodiment 4, the expression of the reconstructed overvoltage signal is as follows:

[0066] V 1 (t) = ifft(V 1 (ω))

[0067]

[0068]

[0069] V 2 (ω) = fft(V 2 (t)) = Mag(ω) * e i*Pha(ω)

[0070] Wherein, V 1 (t) represents the reconstructed overvoltage signal, ifft(·) represents the inverse fast Fourier transform, V 1 (ω) represents the primary side frequency domain signal, V 2$(\omega)$ represents the secondary-side frequency-domain symmetric signal, $H$ 1 $(\omega)$ represents the new wideband transfer characteristic, $Mag(\omega)$ represents the amplitude-frequency characteristic of the secondary-side frequency-domain symmetric signal, $A$ 1 $(\omega)$ represents the amplitude-frequency characteristic of the new wideband transfer characteristic, $e$ represents the natural constant, $i$ represents the imaginary unit, $Pha(\omega)$ represents the phase-frequency characteristic of the secondary-side frequency-domain symmetric signal, $\varphi$ 1 $(\omega)$ represents the phase-frequency characteristic of the new wideband transfer characteristic, $fft(·)$ represents the fast Fourier transform, $V$ 2 $(t)$ represents the secondary-side voltage measured at a fixed frequency.

[0071] In summary, in the method for obtaining the overvoltage signal of the EMU in the embodiments of the present invention, based on the secondary-side voltage of the voltage transformer and the wideband transfer characteristic of the voltage transformer when overvoltage occurs, the primary-side voltage, that is, the overvoltage, is obtained by using the reconstruction algorithm. The present invention makes up for the defect that the current method for obtaining overvoltage cannot consider the transfer characteristic of the voltage transformer in the wideband, effectively improves the accuracy of the obtained overvoltage data. At the same time, the present invention considers the transfer characteristic of the voltage transformer in the wideband, obtains more accurate overvoltage data, and provides effective data support for accurately tracing the source of accidents caused by overvoltage and subsequent accident prevention.

[0072] Embodiment 6

[0073] Based on the same inventive concept, the embodiments of the present invention also provide a system for obtaining the overvoltage signal of the EMU. Since the principle solved by this system is similar to that of the method for obtaining the overvoltage signal of the EMU, the implementation of this system can refer to the implementation of the method, and the repeated parts will not be elaborated.

[0074] Figure 6 is the structural block diagram of the system for obtaining the overvoltage signal of the EMU in the embodiments of the present invention, as Figure 6 shown, the system for obtaining the overvoltage signal of the EMU includes:

[0075] A measurement module, configured to measure the wideband transfer characteristic of the voltage transformer of the EMU;

[0076] An acquisition module, configured to acquire the secondary-side voltage of the voltage transformer when overvoltage occurs in the EMU;

[0077] A reconstruction module, configured to reconstruct the overvoltage signal of the EMU according to the secondary-side voltage of the voltage transformer and the wideband transfer characteristic.

[0078] In one of the embodiments, the measurement module includes:

[0079] A signal generation unit, configured to generate a single-frequency point sine signal and inject the single-frequency point sine signal into the primary side of the voltage transformer;

[0080] A measuring unit for simultaneously measuring the signals on the primary side and the secondary side of a voltage transformer, and determining the phase-frequency characteristic and amplitude-frequency characteristic of the voltage transformer at this single frequency point according to the signals on the primary side and the secondary side of the voltage transformer;

[0081] A judging unit for changing the signal frequency at a fixed frequency interval and 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; otherwise, continuing the iteration;

[0082] A wide-band transfer characteristic determining unit for sorting and combining the obtained amplitude-frequency characteristics and phase-frequency characteristics at multiple single frequency points in ascending order of frequency to obtain the wide-band transfer characteristic of the voltage transformer.

[0083] In one embodiment, the measuring unit includes:

[0084] A first calculation sub-unit for simultaneously measuring the signals on the primary side and the secondary side of the voltage transformer;

[0085] A second calculation sub-unit for respectively recording the amplitudes and phase differences of the signals on the primary side and the secondary side of the voltage transformer, wherein the phase difference is the phase-frequency characteristic at this single frequency point;

[0086] A third calculation sub-unit for determining the amplitude-frequency characteristic of the voltage transformer at this single frequency point according to the amplitudes on the primary side and the secondary side of the voltage transformer.

[0087] In one embodiment, the reconstruction module includes:

[0088] A first calculation unit for performing a 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 symmetric signal symmetric about the zero-frequency point;

[0089] A second calculation unit for supplementing the negative frequencies of the wide-band transfer characteristic and performing linear interpolation processing on the supplemented wide-band transfer characteristic to obtain a new wide-band transfer characteristic;

[0090] A third calculation unit for calculating a primary-side frequency-domain signal according to the new wide-band transfer characteristic and the secondary-side frequency-domain symmetric signal;

[0091] A fourth calculation unit for performing an inverse fast Fourier transform on the primary-side frequency-domain signal to reconstruct an overvoltage signal, and performing smoothing processing on the reconstructed overvoltage signal to complete the acquisition of the overvoltage signal of the EMU.

[0092] In one embodiment, the expression of the reconstructed overvoltage signal is as follows:

[0093] V 1 V(t) = ifft(V 1 (ω))

[0094]

[0095]

[0096] V 2 V(ω) = fft(V 2 (t)) = Mag(ω) * e i*Pha(ω)

[0097] wherein, V 1 V(t) represents the reconstructed overvoltage signal, ifft(·) represents the inverse fast Fourier transform, V 1 (ω) represents the primary-side frequency-domain signal, V 2 (ω) represents the secondary-side frequency-domain symmetric signal, H 1 (ω) represents the new wideband transfer characteristic, Mag(ω) represents the amplitude-frequency characteristic of the secondary-side frequency-domain symmetric signal, A 1 (ω) represents the amplitude-frequency characteristic of the new wideband transfer characteristic, e represents the natural constant, i represents the imaginary unit, Pha(ω) represents the phase-frequency characteristic of the secondary-side frequency-domain symmetric signal, φ 1 (ω) represents the phase-frequency characteristic of the new wideband transfer characteristic, fft(·) represents the fast Fourier transform, V 2 (t) represents the secondary-side voltage measured at a fixed frequency.

[0098] In the embodiments of the present invention, the present application can divide the functional units according to the method for obtaining the overvoltage signal of the EMU. For example, each function can be divided into each functional unit, or two or more functions can be integrated into one processing unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit. It should be noted that the division of units in the present invention is schematic, only a logical division, and there may be other division methods in actual implementation.

[0099] In the embodiments of the present invention, in order to implement the principle and beneficial effects of the method for obtaining the overvoltage signal of the multiple unit train, the overvoltage signal acquisition system of the multiple unit train includes the corresponding hardware structures and / or software modules for performing various functions. Those skilled in the art should easily realize that, in combination with the various schematic units and algorithm steps described in the embodiments disclosed in the present invention, the present invention can be implemented in the form of hardware and / or a combination of hardware and computer software. Whether a certain function is executed in the way driven by hardware or computer software depends on the specific application and design constraints of the technical solution. Different methods can be used for each specific application to implement the described function, but such implementation should not be considered to exceed the scope of this application.

[0100] In summary, in the overvoltage signal acquisition system of the multiple unit train in the embodiments of the present invention, according to the secondary side voltage of the voltage transformer when overvoltage occurs and the wide-band transmission characteristics of the transformer, the primary side voltage, that is, the overvoltage, is obtained by using the reconstruction algorithm. The present invention makes up for the defect that the current method for obtaining overvoltage cannot consider the transmission characteristics of the transformer within the wide frequency band, effectively improves the accuracy of the obtained overvoltage data. At the same time, the present invention considers the transmission characteristics of the voltage transformer within the wide frequency band, obtains more accurate overvoltage data, and provides effective data support for accurately tracing the source of accidents caused by overvoltage and subsequent accident prevention.

[0101] Embodiment 7

[0102] The embodiments of the present invention provide an electronic device, including a memory, a processor, and a computer program stored on the memory and running on the processor. When the processor executes the computer program, the steps of the method for obtaining the overvoltage signal of the multiple unit train according to any one of Embodiments 1 to 5 are implemented. For example, when the processor executes the computer program, the following content can be implemented:

[0103] S1. Measure the wide-band transmission characteristics of the voltage transformer of the multiple unit train;

[0104] S2. Collect the secondary side voltage of the voltage transformer when overvoltage occurs in the multiple unit train;

[0105] S3. According to the secondary side voltage of the voltage transformer and the wide-band transmission characteristics, reconstruct the overvoltage signal of the multiple unit train.

[0106] In this embodiment, the electronic device may include: a processor, a memory, a bus, and a communication interface. The processor, the communication interface, and the memory are connected through the bus. The memory stores a computer program that can run on the processor. When the processor runs the computer program, it executes some or all of the steps of the method for obtaining the overvoltage signal of the multiple unit train provided in any one of the foregoing Embodiments 1 to 5 of the present application.

[0107] In summary, the computer device in the embodiment of the present invention obtains the primary side voltage, i.e., the overvoltage, according to the secondary side voltage of the voltage transformer during overvoltage and the broadband transfer characteristics of the transformer, using a reconstruction algorithm. The present invention makes up for the defect that the current method for obtaining overvoltage cannot consider the transfer characteristics of the voltage transformer within a broadband, effectively improving the accuracy of the obtained overvoltage data. At the same time, the present invention considers the transfer characteristics of the voltage transformer within a broadband, obtains more accurate overvoltage data, and provides effective data support for accurately tracing the source of accidents caused by overvoltage and subsequent accident prevention.

[0108] Embodiment 8

[0109] The embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method for obtaining the overvoltage signal of the multiple unit train according to any one of Embodiments 1 to 5 are implemented. For example, when the processor executes the program, the following content can be implemented:

[0110] S1. Measure the broadband transfer characteristics of the voltage transformer of the multiple unit train;

[0111] S2. Collect the secondary side voltage of the voltage transformer when the multiple unit train has an overvoltage;

[0112] S3. According to the secondary side voltage of the voltage transformer and the broadband transfer characteristics, reconstruct the overvoltage signal of the multiple unit train.

[0113] In summary, the computer-readable storage medium in the embodiment of the present invention obtains the primary side voltage, i.e., the overvoltage, according to the secondary side voltage of the voltage transformer during overvoltage and the broadband transfer characteristics of the transformer, using a reconstruction algorithm. The present invention makes up for the defect that the current method for obtaining overvoltage cannot consider the transfer characteristics of the voltage transformer within a broadband, effectively improving the accuracy of the obtained overvoltage data. At the same time, the present invention considers the transfer characteristics of the voltage transformer within a broadband, obtains more accurate overvoltage data, and provides effective data support for accurately tracing the source of accidents caused by overvoltage and subsequent accident prevention.

[0114] The above computer-readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium accessible by a general-purpose or special-purpose computer. The readable storage medium is coupled to the processor so that the processor can read information from the readable storage medium and write information to the readable storage medium. The readable storage medium can also be a component of the processor. The processor and the readable storage medium can be located in an application-specific integrated circuit (ASIC), or the processor and the readable storage medium can exist as discrete components in the overvoltage signal acquisition system of the multiple unit train.

[0115] Embodiments of the present invention can be provided as a method, apparatus, or computer program product. Therefore, the present invention can take the form of an all-hardware embodiment, an all-software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media including, but not limited to, magnetic disk storage, CD-ROM, optical storage, etc., which include computer-usable program code. Described with reference to the flowcharts and / or block diagrams of methods, devices (apparatus), and computer program products according to embodiments of the present invention, it should be understood that each flow and / or block in the flowcharts and / or block diagrams, and combinations of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a general-purpose computer, special-purpose computer, embedded computer, or other programmable data processing device to work in a specific manner in a computer-readable memory, so that the instructions stored in the computer-readable memory produce a manufactured article including an instruction device that implements the functions specified in one flow Figure 1 in one or more flows and / or Figure 1 in one or more blocks or multiple blocks specified in the block diagrams. These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are performed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one flow or more flows and / or Figure 1 in one or more blocks or multiple blocks specified in the block diagrams.

[0116] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A method for obtaining overvoltage signals of multiple unit trains, characterized in that, it includes the following steps: S1. Measure the broadband transfer characteristics of the voltage transformer of the multiple unit train; S2. Collect the voltage on the secondary side of the voltage transformer when overvoltage occurs in the multiple unit train; S3. According to the voltage on the secondary side of the voltage transformer and the broadband transfer characteristics, reconstruct the overvoltage signal of the multiple unit train, specifically: S301. Perform a fast Fourier transform on the voltage on the secondary side of the voltage transformer to obtain the secondary side frequency domain signal, and convert the secondary side frequency domain signal into a secondary side frequency domain symmetric signal symmetric about the zero frequency point; S302. Supplement the negative frequencies of the broadband transfer characteristics, and perform linear interpolation processing on the supplemented broadband transfer characteristics to obtain a new broadband transfer characteristics; S303. Calculate the primary side frequency domain signal according to the new broadband transfer characteristics and the secondary side frequency domain symmetric signal; S304. Perform an inverse fast Fourier transform on the primary side frequency domain signal to reconstruct the overvoltage signal, and perform smoothing processing on the reconstructed overvoltage signal to obtain the overvoltage signal of the multiple unit train.

2. The method for obtaining overvoltage signals of multiple unit trains according to claim 1, characterized in that, the step S1 includes the following steps: S101. Generate a single-frequency point sine signal, and inject the single-frequency point sine signal into the primary side of the voltage transformer; S102. Measure the signals on the primary side and secondary side of the voltage transformer at the same time, and determine the phase-frequency characteristic and amplitude-frequency characteristic of the voltage transformer at this single-frequency point according to the signals on the primary side and secondary side of the voltage transformer; S103. Change the signal frequency at a fixed frequency interval, and judge whether the signal frequency reaches a preset frequency threshold. If so, determine the phase-frequency characteristic and amplitude-frequency characteristic of the voltage transformer after changing the signal frequency, and enter step S104. Otherwise, return to step S101; S104. Combine the amplitude-frequency characteristics and phase-frequency characteristics of multiple single-frequency points obtained in step S102 and step S103 in ascending order of frequency to obtain the broadband transfer characteristics of the voltage transformer, and enter step S2.

3. The method for obtaining overvoltage signals of multiple unit trains according to claim 2, characterized in that, the step S102 includes the following steps: S1021. Measure the signals on the primary side and secondary side of the voltage transformer at the same time; S1022. Record the amplitude and phase difference of the signals on the primary side and secondary side of the voltage transformer respectively, where the phase difference is the phase-frequency characteristic of this single-frequency point; S1023. Determine the amplitude-frequency characteristic of the voltage transformer at this single-frequency point according to the amplitudes of the primary side and secondary side of the voltage transformer.

4. The method for obtaining overvoltage signals of multiple unit trains according to claim 1, characterized in that, the expression of the reconstructed overvoltage signal in step S304 is as follows: V 1 (t) = ifft(V 1 (ω)) V 2 (ω) = fft(V 2 (t)) = Mag(ω) * e i*Pha(ω) Among them, V 1 (t) represents the reconstructed overvoltage signal, ifft(.) represents the inverse fast Fourier transform, V 1 (ω) represents the primary side frequency domain signal, V 2 (ω) represents the secondary side frequency domain symmetric signal, H 1 (ω) represents the new broadband transfer characteristic, Mag(ω) represents the amplitude-frequency characteristic of the secondary side frequency domain symmetric signal, A 1 (ω) represents the amplitude-frequency characteristic of the new broadband transfer characteristic, e represents the natural constant, i represents the imaginary unit, Pha(ω) represents the phase-frequency characteristic of the secondary side frequency domain symmetric signal, φ 1 (ω) represents the phase-frequency characteristic of the new broadband transfer characteristic, fft(.) represents the fast Fourier transform, V 2 (t) represents the secondary side voltage measured at a fixed frequency.

5. An overvoltage signal acquisition system for multiple unit trains, characterized in that, it includes: a measurement module for measuring the broadband transfer characteristics of the voltage transformer of the multiple unit train; a collection module for collecting the voltage on the secondary side of the voltage transformer when overvoltage occurs in the multiple unit train; A reconstruction module, configured to reconstruct an overvoltage signal of a multiple unit train according to the secondary side voltage of the potential transformer and the wideband transfer characteristic, including: A first calculation unit, configured to perform a fast Fourier transform on the secondary side voltage of the potential transformer to obtain a secondary side frequency domain signal, and convert the secondary side frequency domain signal into a secondary side frequency domain symmetric signal symmetric about the zero frequency point; A second calculation unit, configured to supplement the negative frequency of the wideband transfer characteristic, and perform linear interpolation processing on the supplemented wideband transfer characteristic to obtain a new wideband transfer characteristic; A third calculation unit, configured to calculate a primary side frequency domain signal according to the new wideband transfer characteristic and the secondary side frequency domain symmetric signal; A fourth calculation unit, configured to perform an inverse fast Fourier transform on the primary side frequency domain signal to reconstruct an overvoltage signal, and perform smoothing processing on the reconstructed overvoltage signal to obtain an overvoltage signal of the multiple unit train.

6. The multiple unit train overvoltage signal acquisition system according to claim 5, wherein, the measurement module includes: A signal generation unit, configured to generate a single frequency point sine signal, and inject the single frequency point sine signal into the primary side of the potential transformer; A measurement unit, configured to simultaneously measure the primary side and secondary side signals of the potential transformer, and determine the phase frequency characteristic and amplitude frequency characteristic of the potential transformer at the single frequency point according to the primary side and secondary side signals of the potential transformer; A judgment unit, configured to change the signal frequency at a fixed frequency interval, and judge whether the signal frequency reaches a preset frequency threshold. If so, determine the phase frequency characteristic and amplitude frequency characteristic of the potential transformer after changing the signal frequency; otherwise, continue to iterate; A wideband transfer characteristic determination unit, configured to sort and combine the obtained amplitude frequency characteristics and phase frequency characteristics of multiple single frequency points in ascending order of frequency to obtain the wideband transfer characteristic of the potential transformer.

7. The multiple unit train overvoltage signal acquisition system according to claim 6, wherein, the measurement unit includes: A first calculation subunit, configured to simultaneously measure the primary side and secondary side signals of the potential transformer; A second calculation subunit, configured to respectively record the amplitudes and phase differences of the primary side and secondary side signals of the potential transformer, where the phase difference is the phase frequency characteristic at the single frequency point; A third calculation subunit, configured to determine the amplitude frequency characteristic of the potential transformer at the single frequency point according to the amplitudes of the primary side and secondary side of the potential transformer.

8. The multiple unit train overvoltage signal acquisition system according to claim 5, wherein, the expression of the reconstructed overvoltage signal is as follows: V 1 (t) = ifft(V 1 (ω)) V 2 (ω) = fft(V 2 (t)) = Mag(ω) * e i*Pha(ω) Among them, V 1 (t) represents the reconstructed overvoltage signal, ifft( . ) represents the inverse fast Fourier transform, V 1 (ω) represents the primary-side frequency-domain signal, V 2 (ω) represents the secondary-side frequency-domain symmetric signal, H 1 (ω) represents the new broadband transfer characteristic, Mag(ω) represents the amplitude-frequency characteristic of the secondary-side frequency-domain symmetric signal, A 1 (ω) represents the amplitude-frequency characteristic of the new broadband transfer characteristic, e represents the natural constant, i represents the imaginary unit, Pha(ω) represents the phase-frequency characteristic of the secondary-side frequency-domain symmetric signal, φ 1 (ω) represents the phase-frequency characteristic of the new broadband transfer characteristic, fft(.) represents the fast Fourier transform, V 2 (t) represents the secondary-side voltage measured at a fixed frequency.

9. An electronic device, including a memory, a processor, and a computer program stored on the memory and running on the processor, wherein, when the processor executes the computer program, the steps of the multiple unit train overvoltage signal acquisition method according to any one of claims 1 to 4 are implemented.

10. A computer-readable storage medium, on which a computer program is stored, wherein, when the computer program is executed by a processor, the steps of the multiple unit train overvoltage signal acquisition method according to any one of claims 1 to 4 are implemented.

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