Intermediate resonant circuit detection method, system and device and storage medium

Abstract

The invention belongs to the field of rail transit, and particularly relates to an intermediate resonance circuit detection method, system and device and a storage medium, and the method comprises the steps: enabling an upper computer to be connected with a TCU case, sending a starting instruction to the TCU case to detect whether a secondary resonance point of an intermediate resonance circuit deviates or not, the detection process is as follows: according to the working state and the working power of the intermediate resonant circuit, obtaining intermediate voltage waveforms in a preset acquisition period under different working powers; according to the intermediate voltage waveform and a wave trap algorithm, a ripple voltage effective value under the preset working frequency is obtained; calculating a voltage deviation between the ripple voltage effective value and a standard voltage effective value, and judging whether the voltage deviation is within a preset deviation range or not; and if the voltage deviation is not within the preset deviation, determining that the secondary resonance point of the intermediate resonance circuit deviates. According to the invention, the converter does not need to be dismounted, and whether the secondary resonance frequency point shifts or not can be detected by using the hardware of the vehicle control cabinet.

Description

Technical Field

[0001] This invention belongs to the field of rail transit, and specifically relates to a method, system, device and storage medium for detecting intermediate resonant circuits. Background Technology

[0002] The secondary resonant circuit of a rail transit vehicle is a resonant circuit at a specific frequency, typically composed of a resonant capacitor and a resonant reactor, used to handle energy flow at a specific frequency. Its main functions include ripple control and frequency matching. However, as the vehicle ages, the frequency of the secondary resonant circuit may drift, making it unable to effectively eliminate harmonics in the intermediate circuit. This causes harmonics to be transmitted to the motor side, resulting in motor pulsation, fatigue damage to components, and vibration and noise problems. Furthermore, the intermediate circuit capacitor may be damaged, or even catch fire or explode, due to resonant circuit drift and increased harmonic current. There have been cases of resonant capacitor explosions and fires in rail transit vehicles. Therefore, checking the condition of the intermediate resonant circuit is particularly important during routine maintenance of rail transit vehicles.

[0003] In related technologies, the secondary resonant circuit of rail transit vehicles cannot be monitored in real time on the vehicle. Since the resonant capacitor is located behind the cabinet, the converter needs to be removed from the vehicle for testing during maintenance.

[0004] Regarding the aforementioned technologies, routine maintenance is limited by factors such as site availability, maintenance time, and personnel uniforms, making it impossible to disassemble the converter cabinet for inspection of the secondary resonant circuit. Therefore, routine maintenance rarely checks whether the resonant point of the intermediate circuit has shifted, posing a potential hazard to the safe operation of rail transit vehicles. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method, system, device and storage medium for detecting intermediate resonant circuits, which can detect whether the secondary resonant frequency has shifted without disassembling the converter, using the hardware of the vehicle control box.

[0006] A method for detecting intermediate resonant circuits, comprising:

[0007] Connect the host computer to the TCU chassis and send a start command to the TCU chassis to detect whether the secondary resonant point of the intermediate resonant circuit has shifted. The detection process is as follows:

[0008] Confirm the operating state of the intermediate resonant circuit, which may be static or dynamic.

[0009] Based on the operating state and the operating power of the intermediate resonant circuit, the intermediate voltage waveform within the preset acquisition period under different operating powers is obtained;

[0010] Based on the intermediate voltage waveform and the notch filter algorithm, the effective value of the ripple voltage at the preset operating frequency is obtained;

[0011] Calculate the voltage deviation between the RMS value of the ripple voltage and the RMS value of the standard voltage, wherein the frequency and period of the RMS value of the standard voltage are the same as the frequency and period of the RMS value of the ripple voltage.

[0012] Determine whether the voltage deviation is within the preset deviation;

[0013] If the voltage deviation is not within the preset deviation, it is confirmed that the secondary resonant point of the intermediate resonant circuit has shifted.

[0014] Optionally, obtaining the intermediate voltage waveform within a preset acquisition period under different operating power based on the operating state and the operating power of the intermediate resonant circuit includes:

[0015] When the working state is dynamic, the actual operating power is obtained as the working power of the intermediate resonant circuit, and the intermediate voltage waveform within the preset acquisition period under the actual operating power is obtained by dual redundant synchronous acquisition.

[0016] When the working state is static, a certain preset power is input to the intermediate resonant circuit through the four-quadrant circuit as the working power of the intermediate resonant circuit. The intermediate voltage waveform within the preset acquisition period under different working power is obtained by dual redundancy synchronous acquisition.

[0017] Optionally, the intermediate voltage waveform obtained by dual-redundant synchronous acquisition within a preset acquisition period under different operating power includes:

[0018] Confirm whether the first and second voltage waveforms obtained by dual-redundant synchronous acquisition are within the preset deviation;

[0019] If the first and second voltage waveforms obtained by dual-redundant synchronous acquisition are not within the preset deviation, then the intermediate voltage waveforms under different operating power are reacquired.

[0020] If the first voltage waveform and the second voltage waveform obtained by dual-redundant synchronous acquisition are within the preset deviation, then the first voltage waveform or the second voltage waveform is selected as the intermediate voltage waveform.

[0021] Optionally, obtaining the effective value of the ripple voltage at the preset operating frequency based on the intermediate voltage waveform and the notch filter algorithm includes:

[0022] The intermediate voltage waveform is processed by a notch filter algorithm to extract the ripple voltage waveform at a preset operating frequency.

[0023] The effective value of the ripple voltage within a preset acquisition period at a preset operating frequency is calculated based on the ripple voltage waveform.

[0024] Optionally, the preset operating frequency is 100Hz.

[0025] Optionally, the preset deviation is 3%.

[0026] Optionally, before obtaining the intermediate voltage waveform within a preset acquisition period under different operating power, the following steps are included:

[0027] Determine whether the acquired voltage waveform is stable;

[0028] If the voltage waveform is stable, then the stable voltage waveform is taken as the intermediate voltage waveform.

[0029] An intermediate resonant circuit detection system, comprising:

[0030] Connect the host computer to the TCU chassis and send a start command to the TCU chassis to detect whether the secondary resonant point of the intermediate resonant circuit has shifted. The detection process is as follows:

[0031] The first judgment module is used to confirm the working state of the intermediate resonant circuit, which includes static or dynamic states.

[0032] The extraction module is used to obtain the intermediate voltage waveform within a preset acquisition period under different operating powers, based on the operating state and the operating power of the intermediate resonant circuit.

[0033] The first calculation module is used to obtain the effective value of the ripple voltage at a preset operating frequency based on the intermediate voltage waveform and the notch filter algorithm.

[0034] The second calculation module is used to calculate the voltage deviation between the effective value of the ripple voltage and the effective value of the standard voltage, wherein the frequency and period of the effective value of the standard voltage are the same as the frequency and period of the effective value of the ripple voltage.

[0035] The second judgment module is used to determine whether the voltage deviation is within a preset deviation.

[0036] The confirmation module is used to confirm that the secondary resonant point of the intermediate resonant circuit has shifted if the voltage deviation is not within the preset deviation.

[0037] A terminal device includes a memory and a processor. The memory stores a computer program that can run on the processor. When the processor loads and executes the computer program, it employs an intermediate resonant circuit detection method.

[0038] A computer-readable storage medium storing a computer program, wherein when the computer program is loaded and executed by a processor, an intermediate resonant circuit detection method is employed.

[0039] The beneficial effects of this invention are:

[0040] After connecting the host computer to the TCU chassis, the current operating state of the intermediate resonant circuit is first determined. Based on the operating state and the operating power of the intermediate resonant circuit, the intermediate voltage waveform within a preset acquisition period under different operating powers is obtained. The intermediate voltage waveform is then processed using a notch filter algorithm to obtain the effective value of the ripple voltage at a preset operating frequency. The effective value of the ripple voltage is compared with the effective value of the standard voltage to obtain the voltage deviation. If the voltage deviation is within the preset deviation, it indicates that the secondary resonant point of the intermediate resonant circuit has not shifted; otherwise, it indicates that the secondary resonant point of the intermediate resonant circuit has shifted. This application eliminates the need to disassemble the converter during maintenance; the vehicle control chassis hardware can be used to detect whether the secondary resonant frequency has shifted, thus resolving maintenance blind spots and improving vehicle safety. Attached Figure Description

[0041] Figure 1 This is a schematic flowchart of an intermediate resonant circuit detection method according to the present invention. Detailed Implementation

[0042] A method for detecting intermediate resonant circuits, such as Figure 1 As shown, the present invention includes:

[0043] Connect the host computer to the TCU chassis and send a start command to the TCU chassis to detect whether the secondary resonant point of the intermediate resonant circuit has shifted. The detection process is as follows:

[0044] Specifically, a TCU chassis typically refers to the enclosure or housing used to house and protect the transmission control unit. A TCU is an electronic control module primarily used for controlling automatic transmissions, ensuring the vehicle can shift gears and operate correctly under various conditions. The TCU chassis contains four-quadrant control boards.

[0045] By using a four-quadrant control board, the total power of the intermediate circuit can be calculated by real-time acquisition of data from the four-quadrant input current sensor and the synchronous grid voltage transformer. The power input to the intermediate circuit can then be obtained. Therefore, by controlling the input voltage and current, the input power to the intermediate circuit can be controlled.

[0046] S1. Confirm the working state of the intermediate resonant circuit, which may be static or dynamic.

[0047] Specifically, static testing is mainly for the operation inside the storage facility, where the power of the intermediate circuit is too low to test the ripple voltage of the secondary resonant circuit. Therefore, an input power needs to be given to the intermediate circuit. Dynamic testing is mainly for the line operation conditions, where the intermediate circuit already has power and there is no need to add additional power to the intermediate circuit.

[0048] S2. Based on the working status and the working power of the intermediate resonant circuit, obtain the intermediate voltage waveform within the preset acquisition period under different working power.

[0049] Based on the operating status and the operating power of the intermediate resonant circuit, the intermediate voltage waveforms within the preset acquisition period under different operating power conditions are obtained as follows:

[0050] When the working state is dynamic, the actual operating power is obtained as the working power of the intermediate resonant circuit, and the intermediate voltage waveform within the preset acquisition period under the actual operating power is obtained by dual redundant synchronous acquisition.

[0051] When the working state is static, a certain preset power is input to the intermediate resonant circuit through the four-quadrant circuit as the working power of the intermediate resonant circuit. The intermediate voltage waveform within the preset acquisition period under different working power is obtained by dual redundancy synchronous acquisition.

[0052] Specifically, the preset power can be 1000kVA, 1500kVA and 2000kVA. The power level is controlled by real-time data from the four-quadrant input current sensor and the synchronous grid voltage transformer.

[0053] Specifically, during the data acquisition process, dual-redundant synchronous acquisition is used to ensure the accuracy of the acquired data. The preset acquisition period can be set according to needs, but multiple acquisition periods are usually required.

[0054] The intermediate voltage waveforms obtained by dual-redundant synchronous acquisition within a preset acquisition period under different operating power include:

[0055] Confirm whether the first and second voltage waveforms obtained by dual-redundant synchronous acquisition are within the preset deviation;

[0056] If the first and second voltage waveforms obtained by dual-redundant synchronous acquisition are not within the preset deviation, then the intermediate voltage waveforms under different operating power are reacquired.

[0057] If the first voltage waveform and the second voltage waveform obtained by dual-redundant synchronous acquisition are within the preset deviation, then the first voltage waveform or the second voltage waveform is selected as the intermediate voltage waveform.

[0058] Specifically, dual-redundant synchronous acquisition uses two channels to acquire data simultaneously. By comparing the two sets of data, the accuracy of the acquired data is ensured. To confirm whether the first voltage waveform and the second voltage waveform obtained by dual-redundant synchronous acquisition are within the preset deviation, the peaks or troughs of the first voltage waveform and the second voltage fluctuation are compared. If the difference between the peaks or troughs within the same period is within the preset deviation, the acquired data is considered normal; otherwise, the data is discarded and reacquired.

[0059] The preset deviation calculation method for the first voltage waveform and the second voltage waveform is: (peak / trough of the first voltage fluctuation) - (peak / trough of the second voltage fluctuation) divided by (peak / trough of the first voltage fluctuation).

[0060] Before obtaining the intermediate voltage waveform within the preset acquisition period under different operating power, the following steps are included:

[0061] Determine whether the acquired voltage waveform is stable.

[0062] If the voltage waveform is stable, then the stable voltage waveform is taken as the intermediate voltage waveform.

[0063] Specifically, the stability of the acquired voltage waveform is determined by comparing the amplitude of the peaks or troughs of the voltage fluctuations in each cycle to see if they are within a certain error range. For example, if the amplitude error between adjacent peaks is within 3%, the voltage waveform is considered stable.

[0064] S3. Based on the intermediate voltage waveform and the notch filter algorithm, obtain the effective value of the ripple voltage at the preset operating frequency.

[0065] Based on the intermediate voltage waveform and the notch filter algorithm, the effective value of the ripple voltage at the preset operating frequency is obtained as follows:

[0066] The intermediate voltage waveform is processed by a notch filter algorithm to extract the ripple voltage waveform at a preset operating frequency.

[0067] The effective value of the ripple voltage within the preset acquisition period at the preset operating frequency is calculated based on the ripple voltage waveform.

[0068] Specifically, a notch filter algorithm is a signal processing technique used to remove specific frequency components from a signal, limiting the amplitude of a specific frequency (i.e., the notch frequency) so that the amplitude of that frequency component is close to zero in the output signal. The preset operating frequency in this embodiment is 100Hz. z Extracting a frequency of 100Hz from the intermediate voltage waveform z The voltage waveform is used as the ripple voltage waveform.

[0069] The effective value of ripple voltage is calculated by taking the equivalent DC effect produced by AC voltage or current over a certain period of time. It can usually be obtained by integrating the waveform area to get the effective value.

[0070] S4. Calculate the voltage deviation between the RMS value of the ripple voltage and the RMS value of the standard voltage. The frequency and period of the standard voltage RMS value are the same as those of the RMS value of the ripple voltage.

[0071] Specifically, the standard voltage is the ripple voltage value of the intermediate circuit under a certain power and a certain cycle when it is designed.

[0072] Voltage deviation = (RMS ripple voltage - RMS standard voltage) / RMS standard voltage. The preset deviation is set to 3% in this embodiment.

[0073] S5. Determine whether the voltage deviation is within the preset deviation.

[0074] Specifically, if the voltage deviation is within the preset deviation, it means that the ripple voltage is within the normal range, thus confirming that the secondary resonant point of the intermediate resonant circuit has not shifted. If the voltage deviation is not within the preset deviation, it means that the ripple voltage is within the abnormal range, and the secondary resonant point of the intermediate resonant circuit has shifted.

[0075] S6. If the voltage deviation is not within the preset deviation, then it is confirmed that the secondary resonant point of the intermediate resonant circuit has shifted.

[0076] Specifically, after the resonant point shifts, it can promptly feed back to the host computer and generate alarm information.

[0077] An intermediate resonant circuit detection system, comprising:

[0078] Connect the host computer to the TCU chassis and send a start command to the TCU chassis to detect whether the secondary resonant point of the intermediate resonant circuit has shifted. The detection process is as follows:

[0079] The first judgment module is used to confirm the working state of the intermediate resonant circuit, which includes static or dynamic states.

[0080] The extraction module is used to obtain the intermediate voltage waveform within a preset acquisition period under different operating power conditions, based on the operating status and the operating power of the intermediate resonant circuit.

[0081] The first calculation module is used to obtain the effective value of the ripple voltage at the preset operating frequency based on the intermediate voltage waveform and the notch filter algorithm.

[0082] The second calculation module is used to calculate the voltage deviation between the RMS value of the ripple voltage and the RMS value of the standard voltage. The frequency and period of the RMS value of the standard voltage are the same as the frequency and period of the RMS value of the ripple voltage.

[0083] The second judgment module is used to determine whether the voltage deviation is within the preset deviation.

[0084] The confirmation module is used to confirm that the secondary resonant point of the intermediate resonant circuit has shifted if the voltage deviation is not within the preset deviation.

[0085] This application also discloses a terminal device, including a memory and a processor. The memory stores a computer program that can run on the processor. When the processor loads and executes the computer program, an intermediate resonant circuit detection method is used.

[0086] The terminal device can be a computer device such as a desktop computer, a laptop computer, or a cloud server. The terminal device includes, but is not limited to, a processor and a memory. For example, the terminal device may also include input / output devices, network access devices, and buses.

[0087] The processor can be a central processing unit (CPU). Of course, depending on the actual use, it can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), off-the-shelf programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor, etc., and this application does not limit it in this regard.

[0088] The memory can be an internal storage unit of the terminal device, such as a hard disk or RAM of the terminal device, or an external storage device of the terminal device, such as a plug-in hard disk, smart memory card (SMC), secure digital card (SD), or flash memory card (FC) equipped on the terminal device. Furthermore, the memory can be a combination of internal storage units and external storage devices of the terminal device. The memory is used to store computer programs and other programs and data required by the terminal device. The memory can also be used to temporarily store data that has been output or will be output. This application does not limit this.

[0089] In this terminal device, an intermediate resonant circuit detection method from the above embodiments is stored in the terminal device's memory and loaded and executed on the terminal device's processor for convenient use.

[0090] This application also discloses a computer-readable storage medium, which stores a computer program, wherein when the computer program is executed by a processor, it employs an intermediate resonant circuit detection method as described in the above embodiments.

[0091] The computer program can be stored in a computer-readable medium. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or certain middleware. The computer-readable medium includes any entity or device capable of carrying computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the computer-readable medium includes, but is not limited to, the above-mentioned components.

[0092] The intermediate resonant circuit detection method of the above embodiments is stored in the computer-readable storage medium and loaded and executed on the processor to facilitate the storage and application of the above method.

[0093] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0094] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. A method for detecting intermediate resonant circuits, characterized in that, include: Connect the host computer to the TCU chassis and send a start command to the TCU chassis to detect whether the secondary resonant point of the intermediate resonant circuit has shifted. The detection process is as follows: Confirm the operating state of the intermediate resonant circuit, which may be static or dynamic. Based on the operating state and the operating power of the intermediate resonant circuit, the intermediate voltage waveform within the preset acquisition period under different operating powers is obtained; Based on the intermediate voltage waveform and the notch filter algorithm, the effective value of the ripple voltage at the preset operating frequency is obtained; Calculate the voltage deviation between the RMS value of the ripple voltage and the RMS value of the standard voltage, wherein the frequency and period of the standard voltage RMS value are the same as the frequency and period of the RMS value of the ripple voltage. Determine whether the voltage deviation is within the preset deviation; If the voltage deviation is not within the preset deviation, it is confirmed that the secondary resonant point of the intermediate resonant circuit has shifted.

2. The intermediate resonant circuit detection method as described in claim 1, characterized in that, The step of obtaining the intermediate voltage waveform within a preset acquisition period under different operating powers based on the operating state and the operating power of the intermediate resonant circuit includes: When the working state is dynamic, the actual operating power is obtained as the working power of the intermediate resonant circuit, and the intermediate voltage waveform within the preset acquisition period under the actual operating power is obtained by dual redundant synchronous acquisition. When the working state is static, a certain preset power is input to the intermediate resonant circuit through the four-quadrant circuit as the working power of the intermediate resonant circuit. The intermediate voltage waveform within the preset acquisition period under different working power is obtained by dual redundancy synchronous acquisition.

3. The intermediate resonant circuit detection method as described in claim 2, characterized in that, The intermediate voltage waveforms obtained by dual-redundant synchronous acquisition within a preset acquisition period under different operating power include: Confirm whether the first and second voltage waveforms obtained by dual-redundant synchronous acquisition are within the preset deviation; If the first and second voltage waveforms obtained by dual-redundant synchronous acquisition are not within the preset deviation, then the intermediate voltage waveforms under different operating power are reacquired. If the first voltage waveform and the second voltage waveform obtained by dual-redundant synchronous acquisition are within the preset deviation, then the first voltage waveform or the second voltage waveform is selected as the intermediate voltage waveform.

4. The intermediate resonant circuit detection method as described in claim 1, characterized in that, The step of obtaining the effective value of the ripple voltage at the preset operating frequency based on the intermediate voltage waveform and the notch filter algorithm includes: The intermediate voltage waveform is processed by a notch filter algorithm to extract the ripple voltage waveform at a preset operating frequency. The effective value of the ripple voltage within a preset acquisition period at a preset operating frequency is calculated based on the ripple voltage waveform.

5. The intermediate resonant circuit detection method as described in claim 4, characterized in that, The preset operating frequency is 100Hz.

6. The intermediate resonant circuit detection method as described in claim 1, characterized in that, The preset deviation is 3%.

7. The intermediate resonant circuit detection method as described in claim 1, characterized in that, Before obtaining the intermediate voltage waveform within a preset acquisition period under different operating power, the following steps are included: Determine whether the acquired voltage waveform is stable; If the voltage waveform is stable, then the stable voltage waveform is taken as the intermediate voltage waveform.

8. A detection system for an intermediate resonant circuit, characterized in that, include: Connect the host computer to the TCU chassis and send a start command to the TCU chassis to detect whether the secondary resonant point of the intermediate resonant circuit has shifted. The detection process is as follows: The first judgment module is used to confirm the working state of the intermediate resonant circuit, which includes static or dynamic states. The extraction module is used to obtain the intermediate voltage waveform within a preset acquisition period under different operating powers, based on the operating state and the operating power of the intermediate resonant circuit. The first calculation module is used to obtain the effective value of the ripple voltage at a preset operating frequency based on the intermediate voltage waveform and the notch filter algorithm. The second calculation module is used to calculate the voltage deviation between the effective value of the ripple voltage and the effective value of the standard voltage, wherein the frequency and period of the effective value of the standard voltage are the same as the frequency and period of the effective value of the ripple voltage. The second judgment module is used to determine whether the voltage deviation is within a preset deviation. The confirmation module is used to confirm that the secondary resonant point of the intermediate resonant circuit has shifted if the voltage deviation is not within the preset deviation.

9. A terminal device, comprising a memory and a processor, characterized in that, The memory stores a computer program that can run on a processor, and when the processor loads and executes the computer program, it employs the method described in any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is loaded and executed by the processor, it employs the method described in any one of claims 1 to 7.

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