Energy storage converter resonance photoacoustic gas detection method, device and equipment and storage medium

Abstract

The invention provides an energy storage converter resonance photoacoustic gas detection method, device and equipment and a storage medium. The method comprises the following steps: knocking a fixed bottom plate at a constant speed to generate a signal, transmitting the signal into an H-type photoacoustic cell, detecting at a middle position, performing Fourier transform, and performing Lorentz fitting to obtain a resonance frequency. Then, a laser is controlled to emit laser of which the modulation frequency is half of the resonant frequency, and the laser is incident to the H-type photoacoustic cell through an optical fiber to excite a gas photoacoustic signal; the signal is detected at the middle position, a second harmonic component is extracted through lock-in amplification processing, and the concentration of the gas to be detected is inverted. According to the method, the frequency characteristic of the photoacoustic cell is tracked by using the knocking signal, and the advanced signal processing technology is combined, so that the precision, the stability and the reliability of the resonance photoacoustic gas detection system in the high-altitude area are effectively improved.

Description

Technical Field

[0001] The present application belongs to the field of gas concentration detection, and in particular, relates to a resonant photoacoustic gas detection method, device, equipment and storage medium for energy storage inverters. Background Art

[0002] As the interface between the energy storage system and the power grid, the performance of the energy storage converter has an important impact on the stability of the power system. As new energy gradually becomes the main body of power system electricity, more energy storage and other equipment with active support capabilities are needed to take the responsibility of voltage and frequency adjustment. Active support energy storage systems not only have the ability to support the stability of the power grid, but also have multiple functions such as conventional energy storage and reactive power compensation. They are the key to ensuring the stable operation of high-proportion new energy systems.

[0003] In the scenario of new energy grid connection, it is often necessary to operate multiple energy storage VSCs in parallel to provide greater capacity and more flexible control strategies. There are complex interactions between the power sources in the energy storage VSC multi-machine parallel system, including the characteristics of the energy storage VSC itself, between energy storage VSCs, and between energy storage VSCs and grid power sources. These complex interactions can lead to system stability problems, especially when the number of parallel connections increases. Summary of the invention

[0004] The purpose of the present application is to overcome the above-mentioned prior art and provide a resonant photoacoustic gas detection method, device, equipment and storage medium.

[0005] The present application provides a resonant photoacoustic gas detection method for an energy storage converter, which is applied to a resonant photoacoustic gas detection device, the device comprising: a fixed bottom plate, an H-type photoacoustic cell arranged on the fixed bottom plate, a distributed feedback laser, and a transmission optical fiber. The method comprises:

[0006] The fixed bottom plate is struck at a uniform speed to generate an external striking signal;

[0007] The external knocking signal is transmitted along the fixed bottom plate to the H-shaped photoacoustic cell arranged on the fixed bottom plate;

[0008] Detecting the external knocking signal at the middle position of the H-type photoacoustic cell;

[0009] Performing Fourier transform on the detected external knocking signal to obtain an amplitude-frequency response, and performing Lorentz fitting on the amplitude-frequency response to obtain the resonance frequency of the H-type photoacoustic cell;

[0010] Controlling the distributed feedback laser to emit laser light with a modulation frequency that is half of the resonance frequency;

[0011] The laser is incident into the H-type photoacoustic cell via the transmission optical fiber to excite the gas photoacoustic signal;

[0012] detecting the gas photoacoustic signal at the middle position of the H-type photoacoustic cell, and performing phase-locked amplification processing on the gas photoacoustic signal to extract the second harmonic component of the gas photoacoustic signal;

[0013] The concentration of the gas to be measured is inverted according to the second harmonic component.

[0014] Optionally, the fixed base plate is struck at a uniform speed to generate an external striking signal, including:

[0015] The stepper motor drives the uniform-speed hammer to strike the fixed bottom plate at a uniform speed;

[0016] The stepper motor has a rotational angular velocity range of π / 6rad / s to π / 4rad / s, including clockwise and counterclockwise rotation direction switching, and a unidirectional rotation angle of 90°.

[0017] Optionally, the first-order longitudinal resonance frequency of the H-type photoacoustic cell ranges from 500 Hz to 10 kHz, and its resonance tube is 100 mm long and 8 mm in diameter, and the buffer chamber is 50 mm long and 44 mm in diameter.

[0018] Optionally, the central wavelength of the distributed feedback laser is 1532.83 nm, the power is 15 mW, and the laser is incident into the H-type photoacoustic cell through a transmission optical fiber.

[0019] Optionally, it also includes:

[0020] Before detecting the external knocking signal, the initial resonance frequency of the H-type photoacoustic cell was determined through a calibration step.

[0021] Optionally, the fixed base plate is made of stainless steel with a thickness not exceeding 8 mm and not less than 2 mm.

[0022] Optionally, it also includes:

[0023] A supporting cushion made of elastic rubber material is arranged under the H-type photoacoustic cell, with a thickness of not less than 10 mm.

[0024] The present application also provides an energy storage converter resonant photoacoustic gas detection device, comprising: a control circuit, a distributed feedback laser, an H-type photoacoustic cell, a micro-electromechanical system microphone, a fixed base plate, a stepper motor, a micro plastic hammer and a supporting cushion;

[0025] The control circuit is used for driving the stepper motor, extracting and processing the signal detected by the micro-electromechanical system microphone, and controlling the output of the distributed feedback laser;

[0026] The distributed feedback laser outputs laser light of a specific wavelength, which is incident into the H-type photoacoustic cell through the transmission optical fiber to excite the gas photoacoustic signal;

[0027] The MEMS microphone is arranged in the middle of the H-shaped photoacoustic cell;

[0028] The fixed bottom plate is used to fix the control circuit, the H-type photoacoustic cell and the stepping motor;

[0029] The stepper motor rotates at a constant speed and drives the micro plastic hammer to knock the fixed bottom plate;

[0030] The striking position of the micro plastic hammer is at the same distance from the incident surface and the exit surface of the H-type photoacoustic cell;

[0031] The supporting cushion is placed below the fixed bottom plate.

[0032] The present application also provides a resonant photoacoustic gas detection device for an energy storage converter, comprising:

[0033] Memory;

[0034] A processor is used to retrieve from the memory a computer executable program of the above-mentioned energy storage inverter resonant photoacoustic gas detection method, and execute: uniformly knocking a fixed bottom plate to generate an external knocking signal; the external knocking signal is transmitted along the fixed bottom plate to an H-type photoacoustic cell arranged on the fixed bottom plate; the external knocking signal is detected at the middle position of the H-type photoacoustic cell; Fourier transform is performed on the detected external knocking signal to obtain an amplitude-frequency response, and Lorentz fitting is performed on the amplitude-frequency response to obtain the resonant frequency of the H-type photoacoustic cell; a distributed feedback laser is controlled to emit a laser with a modulation frequency of half the resonant frequency; the laser is incident into the H-type photoacoustic cell through a transmission optical fiber to excite a gas photoacoustic signal; the gas photoacoustic signal is detected at the middle position of the H-type photoacoustic cell, and the gas photoacoustic signal is phase-locked amplified to extract the second harmonic component of the gas photoacoustic signal; and the concentration of the gas to be measured is inverted according to the second harmonic component.

[0035] The present application also provides a storage medium, comprising: storing a computer executable program, wherein the computer executable program is used to be called by a processor to execute the steps of the above-mentioned resonant photoacoustic gas detection method.

[0036] The beneficial effects of this application are:

[0037] The present application provides a resonant photoacoustic gas detection method for an energy storage converter, which is applied to a resonant photoacoustic gas detection device. The device comprises: a fixed bottom plate, an H-type photoacoustic cell arranged on the fixed bottom plate, a distributed feedback laser, and a transmission optical fiber. The method comprises: uniformly knocking the fixed bottom plate to generate an external knocking signal; the external knocking signal is transmitted along the fixed bottom plate to the H-type photoacoustic cell arranged on the fixed bottom plate; the external knocking signal is detected at the middle position of the H-type photoacoustic cell; Fourier transform is performed on the detected external knocking signal to obtain an amplitude-frequency response, and Lorentz fitting is performed on the amplitude-frequency response to obtain the resonant frequency of the H-type photoacoustic cell; the distributed feedback laser is controlled to emit a laser with a modulation frequency that is half of the resonant frequency; the laser is incident into the H-type photoacoustic cell through the transmission optical fiber to excite a gas photoacoustic signal; the gas photoacoustic signal is detected at the middle position of the H-type photoacoustic cell, and the gas photoacoustic signal is subjected to phase-locked amplification processing to extract the second harmonic component of the gas photoacoustic signal; and the concentration of the gas to be measured is inverted according to the second harmonic component. This application uses knocking signals to track the frequency characteristics of the photoacoustic cell and combines it with advanced signal processing technology to effectively improve the accuracy, stability and reliability of the resonant photoacoustic gas detection system in high-altitude areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the resonant photoacoustic gas detection process in high altitude areas in this application;

[0039] Figure 2 It is a schematic diagram of the resonant photoacoustic gas detection device for high altitude areas in this application. DETAILED DESCRIPTION

[0040] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0041] Please refer to Figure 1As shown, the present application provides a method for resonant photoacoustic gas detection of an energy storage converter, which is implemented based on a resonant photoacoustic gas detection device of an energy storage converter, and the device includes a control circuit 1, a distributed feedback laser 2, a transmission optical fiber 3, an H-type photoacoustic cell 4, a micro-electromechanical system microphone 5, a fixed base plate 6, a stepper motor 7, a miniature plastic hammer 8 and a supporting cushion 9; the control circuit 1, the H-type photoacoustic cell 4 (an H-type H-type photoacoustic cell, with a first-order longitudinal resonance frequency range of 500Hz-10kHz) and the stepper motor 7 are all fixed on the fixed base plate 6, and the fixed base plate 6 is placed on the supporting cushion 9; the control circuit 1 is electrically connected to the distributed feedback laser 2, the micro-electromechanical system microphone 5 and the stepper motor 7.

[0042] The present application provides a resonant photoacoustic gas detection method for an energy storage converter, which is implemented by the following steps:

[0043] S101, knocking a fixed bottom plate at a uniform speed to generate an external knocking signal.

[0044] The control circuit 1 drives the stepper motor 7, and the stepper motor 7 drives the micro plastic hammer 8 to strike the fixed bottom plate 6 at a uniform speed, and the striking signal generated by the micro plastic hammer 8 is transmitted to the H-type photoacoustic cell 4 via the fixed bottom plate 6. As a preferred embodiment, the speed at which the micro plastic hammer 8 strikes the fixed bottom plate 6 is controllable to ensure the stability of the signal generated by each strike and improve the accuracy of subsequent frequency detection.

[0045] S102, the external knocking signal is transmitted along the fixed bottom plate to an H-shaped photoacoustic cell arranged on the fixed bottom plate.

[0046] S103, detecting the external knocking signal at the middle position of the H-type photoacoustic cell.

[0047] A micro-electromechanical system microphone 5 is disposed in the middle of the H-shaped photoacoustic cell 4 . The micro-electromechanical system microphone 5 is used to receive the knocking signal transmitted to the H-shaped photoacoustic cell 4 along the fixed bottom plate 6 .

[0048] S104, performing Fourier transform on the detected external knocking signal to obtain an amplitude-frequency response, and performing Lorentz fitting on the amplitude-frequency response to obtain the resonance frequency of the H-type photoacoustic cell.

[0049] The control circuit 1 extracts the knocking signal detected by the MEMS microphone 5 and performs Fourier transform on the signal to obtain the amplitude-frequency response of the knocking signal. Then, the resonant frequency of the H-type photoacoustic cell 4 is extracted from the amplitude-frequency response by the Lorentz fitting method.

[0050] S105, controlling the distributed feedback laser to emit laser light with a modulation frequency that is half of the resonance frequency.

[0051] According to the extracted resonance frequency, the control circuit 1 controls the distributed feedback laser 2 to emit a laser with a modulation frequency of half the resonance frequency. This step is the key to exciting the gas photoacoustic signal. By matching the resonance frequency, the photoacoustic signal can be maximized and the sensitivity of the system can be improved.

[0052] S106, the laser is incident into the H-type photoacoustic cell via the transmission optical fiber to excite the gas photoacoustic signal.

[0053] The laser is incident into the H-type photoacoustic cell 4 through the transmission optical fiber 3, interacts with the gas in the cell, and excites the gas photoacoustic signal.

[0054] S107 , detecting the gas photoacoustic signal at the middle position of the H-type photoacoustic cell, and performing phase-locked amplification processing on the gas photoacoustic signal to extract the second harmonic component of the gas photoacoustic signal.

[0055] The MEMS microphone 5 in the middle of the H-type photoacoustic cell 4 is also used to detect the excited gas photoacoustic signal and transmit the signal to the control circuit 1. The control circuit 1 performs phase-locked amplification processing on the received gas photoacoustic signal to extract the second harmonic component of the signal. This step is to improve the signal-to-noise ratio of the signal and facilitate the subsequent gas concentration inversion.

[0056] S108. Invert the concentration of the gas to be measured according to the second harmonic component.

[0057] Through a certain algorithm or model, the concentration of the gas to be tested is inverted based on the extracted second harmonic component. This step is based on the basic principle of photoacoustic spectroscopy gas detection, that is, there is a certain relationship between the gas concentration and the intensity of the photoacoustic signal. Therefore, the gas concentration can be inverted through the second harmonic component.

[0058] like Figure 2 The present application also provides a resonant photoacoustic gas detection device, comprising: a control circuit 1, a distributed feedback laser 2, an H-type photoacoustic cell 4, a micro-electromechanical system microphone 5, a fixed base plate 6, a stepper motor 7, a micro plastic hammer 8 and a supporting cushion 9.

[0059] Control circuit 1: As the control center of the system, it is responsible for driving the stepper motor 7, extracting and processing the signal detected by the MEMS microphone 5, and controlling the output of the distributed feedback laser 2.

[0060] Distributed feedback laser 2: according to the instruction of control circuit 1, it outputs laser of specific wavelength and is incident into H-type photoacoustic cell 4 through transmission optical fiber 3 to excite gas photoacoustic signal.

[0061] Transmission fiber 3: As the transmission medium of laser, it transmits the laser output by distributed feedback laser 2 to H-type photoacoustic cell 4. H-type photoacoustic cell 4: The core component of the system, used to receive laser and excite gas photoacoustic signal. Its shape and size design are conducive to acoustic resonance, thereby enhancing the photoacoustic signal.

[0062] MEMS microphone 5: located in the middle of the H-shaped photoacoustic cell 4, used to detect knocking signals and gas photoacoustic signals, and transmit the signals to the control circuit 1 for processing.

[0063] Fixed bottom plate 6: used to fix the control circuit 1, H-type photoacoustic cell 4 and stepper motor 7 to ensure the stability and accuracy of the system. The material is stainless steel with moderate thickness.

[0064] The stepper motor 7: according to the instruction of the control circuit 1, it rotates at a constant speed and drives the miniature plastic hammer 8 to knock the fixed bottom plate 6, generating a knocking signal.

[0065] Miniature plastic hammer 8 is rigidly connected to the rotating shaft of the stepping motor 7 and is used to generate a knocking signal. The knocking position is at the same distance as the incident surface and the exit surface of the H-type photoacoustic cell 4.

[0066] Support cushion 9: placed under the fixed base plate 6, used to provide cushioning and support to ensure the stability and accuracy of the system.

[0067] Shape of each component:

[0068] Control circuit 1: Generally in the shape of a rectangular or circular circuit board, containing various electronic components and interfaces.

[0069] Distributed feedback laser 2: Usually cylindrical or rectangular in shape, including a laser emitter head and a power interface, etc.

[0070] Transmission optical fiber 3: a slender cylindrical fiber used to transmit laser light.

[0071] H-type photoacoustic cell 4: generally an H-shaped structure, including a resonance tube and a buffer chamber, etc., and the shape and size are designed according to the principle of acoustic resonance.

[0072] MEMS microphone 5: A small cylindrical or rectangular shape, containing sensor elements and interfaces, etc.

[0073] Fixed bottom plate 6: generally a rectangular stainless steel plate with moderate thickness and smooth surface.

[0074] Stepper motor 7: cylindrical or rectangular, including motor body and rotating shaft.

[0075] Miniature plastic hammer 8: a small hammer-shaped structure, the handle portion of which is rigidly connected to the rotating shaft of the stepper motor 7.

[0076] Support cushion 9: generally a rectangular or circular elastic rubber cushion with moderate thickness and a flat surface.

[0077] The present application also provides a resonant photoacoustic gas detection device for an energy storage converter, comprising:

[0078] Memory;

[0079] A processor is used to retrieve from the memory a computer executable program of the above-mentioned energy storage inverter resonant photoacoustic gas detection method, and execute: uniformly knocking a fixed bottom plate to generate an external knocking signal; the external knocking signal is transmitted along the fixed bottom plate to an H-type photoacoustic cell arranged on the fixed bottom plate; the external knocking signal is detected at the middle position of the H-type photoacoustic cell; the detected external knocking signal is subjected to Fourier transform to obtain an amplitude-frequency response, and the resonant frequency of the H-type photoacoustic cell is obtained by Lorentz fitting; a distributed feedback laser is controlled to emit a laser with a modulation frequency of half the resonant frequency; the laser is incident into the H-type photoacoustic cell through a transmission optical fiber to excite a gas photoacoustic signal; the gas photoacoustic signal is detected at the middle position of the H-type photoacoustic cell, and the gas photoacoustic signal is subjected to phase-locked amplification processing to extract the second harmonic component of the gas photoacoustic signal; and the concentration of the gas to be measured is inverted according to the second harmonic component.

[0080] The present application also provides a storage medium, comprising: storing a computer executable program, wherein the computer executable program is used to be called by a processor to execute the steps of the above-mentioned resonant photoacoustic gas detection method.

Claims

1. A resonant photoacoustic gas detection method for energy storage converter, characterized in that: Applied to a resonant photoacoustic gas detection device, the device comprises: a fixed bottom plate, an H-type photoacoustic cell arranged on the fixed bottom plate, a distributed feedback laser, and a transmission optical fiber. The method comprises: The fixed bottom plate is struck at a uniform speed to generate an external striking signal; The external knocking signal is transmitted along the fixed bottom plate to the H-shaped photoacoustic cell arranged on the fixed bottom plate; Detecting the external knocking signal at the middle position of the H-type photoacoustic cell; Performing Fourier transform on the detected external knocking signal to obtain an amplitude-frequency response, and performing Lorentz fitting on the amplitude-frequency response to obtain the resonance frequency of the H-type photoacoustic cell; Controlling the distributed feedback laser to emit laser light with a modulation frequency that is half of the resonance frequency; The laser is incident into the H-type photoacoustic cell via the transmission optical fiber to excite the gas photoacoustic signal; detecting the gas photoacoustic signal at the middle position of the H-type photoacoustic cell, and performing phase-locked amplification processing on the gas photoacoustic signal to extract the second harmonic component of the gas photoacoustic signal; The concentration of the gas to be measured is inverted according to the second harmonic component.

2. According to claim 1, a resonant photoacoustic gas detection method for energy storage converter is characterized in that: The fixed base plate is struck at a constant speed to generate an external striking signal, including: The stepper motor drives the uniform-speed hammer to strike the fixed bottom plate at a uniform speed; The stepper motor has a rotational angular velocity range of π / 6rad / s to π / 4rad / s, including clockwise and counterclockwise rotation direction switching, and a unidirectional rotation angle of 90°.

3. The method for resonant photoacoustic gas detection of an energy storage converter according to claim 1, characterized in that: The first-order longitudinal resonance frequency of the H-type photoacoustic cell ranges from 500 Hz to 10 kHz, and the resonance tube thereof is 100 mm long and 8 mm in diameter, and the buffer chamber is 50 mm long and 44 mm in diameter.

4. The resonant photoacoustic gas detection method for energy storage converter according to claim 1, characterized in that: The central wavelength of the distributed feedback laser is 1532.83 nm, and the power is 15 mW.

5. The method for resonant photoacoustic gas detection of an energy storage converter according to claim 1, characterized in that: Also includes: Before detecting the external knocking signal, the initial resonance frequency of the H-type photoacoustic cell was determined through a calibration step.

6. The resonant photoacoustic gas detection method for energy storage converter according to claim 1, characterized in that: The fixed bottom plate is made of stainless steel and has a thickness not exceeding 8 mm and not less than 2 mm.

7. The method for resonant photoacoustic gas detection of an energy storage converter according to claim 1, characterized in that: Also includes: A supporting cushion made of elastic rubber material is arranged under the H-type photoacoustic cell, with a thickness of not less than 10 mm.

8. A resonant photoacoustic gas detection device for an energy storage converter, characterized in that: include: control circuit, distributed feedback laser, H-type photoacoustic cell, MEMS microphone, fixed base plate, stepper motor, micro plastic hammer and supporting cushion; The control circuit is used for driving the stepper motor, extracting and processing the signal detected by the micro-electromechanical system microphone, and controlling the output of the distributed feedback laser; The distributed feedback laser outputs laser light of a specific wavelength, which is incident into the H-type photoacoustic cell through the transmission optical fiber to excite the gas photoacoustic signal; The MEMS microphone is arranged in the middle of the H-shaped photoacoustic cell; The fixed bottom plate is used to fix the control circuit, the H-type photoacoustic cell and the stepping motor; The stepper motor rotates at a constant speed and drives the micro plastic hammer to knock the fixed bottom plate; The striking position of the micro plastic hammer is at the same distance from the incident surface and the exit surface of the H-type photoacoustic cell; The supporting cushion is placed below the fixed bottom plate.

9. A resonant photoacoustic gas detection device for energy storage converter, characterized in that: include: Memory; A processor, for retrieving from the memory a computer executable program of a resonant photoacoustic gas detection method according to any one of claims 1 to 7, and executing: uniformly knocking a fixed bottom plate to generate an external knocking signal; the external knocking signal is transmitted along the fixed bottom plate to an H-type photoacoustic cell arranged on the fixed bottom plate; the external knocking signal is detected at the middle position of the H-type photoacoustic cell; Fourier transform is performed on the detected external knocking signal to obtain an amplitude-frequency response, and Lorentz fitting is performed on the amplitude-frequency response to obtain the resonant frequency of the H-type photoacoustic cell; a distributed feedback laser is controlled to emit a laser with a modulation frequency of half the resonant frequency; the laser is incident into the H-type photoacoustic cell through a transmission optical fiber to excite a gas photoacoustic signal; the gas photoacoustic signal is detected at the middle position of the H-type photoacoustic cell, and the gas photoacoustic signal is phase-locked amplified to extract the second harmonic component of the gas photoacoustic signal; and the concentration of the gas to be measured is inverted according to the second harmonic component.

10. A storage medium, characterized in that: include: A computer executable program is stored, and the computer executable program is used to be called by a processor to execute the steps of a resonant photoacoustic gas detection method as described in any one of claims 1 to 7.

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