Ultraviolet partial discharge detection method and device, storage medium, and ultraviolet sensor

Abstract

The present invention relates to the field of partial discharge detection technology, and more particularly to an ultraviolet partial discharge detection method and device, a storage medium, and an ultraviolet sensor. The ultraviolet partial discharge detection method is applied to a gallium nitride ultraviolet sensor. The ultraviolet partial discharge detection method comprises: obtaining an initial ultraviolet detection signal and an environmental parameter detection signal, and preprocessing the initial ultraviolet detection signal and the environmental parameter detection signal respectively to obtain an actual ultraviolet detection signal and a drift compensation value; when it is determined based on the actual ultraviolet detection signal that the gallium nitride ultraviolet sensor is in a true partial discharge state, compensating the actual ultraviolet detection signal based on the drift compensation value; and obtaining the true ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal based on the compensated actual ultraviolet detection signal. Thus, the detection accuracy and stability of the ultraviolet signal can be improved, and excessive deviation in the detection result caused by interference from environmental factors can be avoided, significantly reducing the frequency of false alarms.

Description

Technical Field

[0001] The present invention relates to the technical field of partial discharge detection, and in particular to an ultraviolet partial discharge detection method and device, a storage medium, and an ultraviolet sensor. Background Art

[0002] In the field of partial discharge (PD) detection, ultraviolet (UV) PD detection technology, due to its unique advantages, has been widely used for insulation condition monitoring of electrical equipment. However, practical applications of this technology have numerous drawbacks. The accuracy of UV PD detection is easily affected by environmental factors. For example, the carrier concentration of the sensor material increases exponentially with increasing temperature, causing significant drift in the dark current (the background current in the absence of PD) and large fluctuations in the signal baseline. In high-humidity environments, such as coastal areas or during the rainy season, water molecules are easily adsorbed on the sensor surface, forming an ion-conductive film. This not only reduces photoelectric conversion efficiency but also introduces random noise, directly affecting the signal-to-noise ratio (SNR) of the detection signal. Furthermore, in the early stages of PD development, weak UV light was detected. To ensure sensor sensitivity, the weak UV signal needed to be extracted. The harsh operating conditions of actual electrical equipment negatively impact the operating characteristics of PD sensors, severely affecting the effective extraction of PD signals and thus reducing the accuracy of UV PD detection. Summary of the Invention

[0003] The present invention aims to at least partially address one of the technical problems in the related art. To this end, a first object of the present invention is to provide a method for detecting ultraviolet partial discharge (UVPD) that improves the detection accuracy and stability of UV signals, avoids excessive deviations in detection results due to interference from environmental factors, and significantly reduces the frequency of false alarms.

[0004] A second object of the present invention is to provide a computer-readable storage medium.

[0005] The third object of the present invention is to provide an ultraviolet partial discharge detection device.

[0006] A fourth objective of the present invention is to provide an ultraviolet sensor.

[0007] In order to achieve the above-mentioned objectives, an embodiment of the first aspect of the present invention proposes a method for detecting ultraviolet partial discharge, wherein the method is applied to a gallium nitride ultraviolet sensor, and the method includes: obtaining an initial ultraviolet detection signal and an environmental parameter detection signal, and preprocessing the initial ultraviolet detection signal and the environmental parameter detection signal respectively to obtain an actual ultraviolet detection signal and a drift compensation value; when it is determined that the gallium nitride ultraviolet sensor is in a real partial discharge state according to the actual ultraviolet detection signal, compensating the actual ultraviolet detection signal according to the drift compensation value; and obtaining the real ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal according to the compensated actual ultraviolet detection signal.

[0008] According to an embodiment of the present invention, the UV partial discharge detection method obtains an initial UV detection signal and an environmental parameter detection signal, and preprocesses the initial UV detection signal and the environmental parameter detection signal to obtain an actual UV detection signal and a drift compensation value. When the actual UV detection signal determines that the gallium nitride UV sensor is in a true partial discharge state, the actual UV detection signal is compensated according to the drift compensation value, and the actual UV partial discharge intensity corresponding to the initial UV detection signal is obtained based on the compensated actual UV detection signal. This improves the detection accuracy and stability of the UV signal, avoids excessive deviation in the detection results due to interference from environmental factors, and significantly reduces the frequency of false alarms.

[0009] In addition, the ultraviolet partial discharge detection method according to the above embodiment of the present invention may further include the following embodiments:

[0010] According to one embodiment of the present invention, preprocessing the initial ultraviolet detection signal includes: performing high-pass filtering and adaptive notch filtering on the initial ultraviolet detection signal to obtain the actual ultraviolet detection signal.

[0011] According to one embodiment of the present invention, the environmental parameter detection signal includes a temperature detection signal and a humidity detection signal, and preprocessing the environmental parameter detection signal includes: obtaining a temperature offset value and a humidity offset value according to the temperature detection signal and the humidity detection signal using the following formula:

[0012]

[0013]

[0014] in, Indicates the temperature offset value, represents the temperature offset coefficient, Indicates the current temperature. Indicates the reference temperature, Indicates the humidity offset value, represents the humidity offset coefficient, Indicates the current humidity. represents the reference humidity; and the sum of the temperature offset value and the humidity offset value is used as the drift compensation value.

[0015] According to one embodiment of the present invention, the method further includes: obtaining a slope corresponding to the actual ultraviolet detection signal; when the slope corresponding to the actual ultraviolet detection signal is greater than a preset slope threshold and it is determined according to a dynamic recovery model that the actual ultraviolet detection signal has not recovered, determining that the gallium nitride ultraviolet sensor is in a true partial discharge state, wherein the fitting formula of the dynamic recovery model is as follows:

[0016]

[0017] in, is the output voltage at time t corresponding to the actual ultraviolet detection signal; is the initial voltage after ultraviolet excitation corresponding to the actual ultraviolet detection signal; is the constant of recovery time; is a steady-state baseline voltage. When the output voltage corresponding to the actual ultraviolet detection signal does not conform to the above fitting formula, it is determined that the actual ultraviolet detection signal has not recovered.

[0018] According to one embodiment of the present invention, compensating the actual ultraviolet detection signal according to the drift compensation value includes: obtaining a difference between the actual ultraviolet detection signal and the drift compensation value, and using the difference as the compensated actual ultraviolet detection signal.

[0019] According to one embodiment of the present invention, the actual ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal is obtained by the following formula:

[0020] U=K1×U_true+ K2×Uk,

[0021] Among them, U is the true UV partial discharge intensity, U_true is the amplitude of the actual UV detection signal after compensation, Uk is the slope of the actual UV detection signal after compensation, and K1 and K2 are constant coefficients.

[0022] According to one embodiment of the present invention, the method further includes: when the slope corresponding to the actual ultraviolet detection signal is less than or equal to the preset slope threshold, determining that the gallium nitride ultraviolet sensor is in a state without partial discharge, and controlling the gallium nitride ultraviolet sensor to enter a low power consumption mode.

[0023] In order to achieve the above-mentioned purpose, a second embodiment of the present invention proposes a computer-readable storage medium on which an ultraviolet partial discharge detection program is stored. When the ultraviolet partial discharge detection program is executed by a processor, the ultraviolet partial discharge detection method of the aforementioned embodiment of the present invention is implemented.

[0024] According to the computer-readable storage medium of an embodiment of the present invention, the ultraviolet partial discharge detection program is executed by a processor, which can improve the detection accuracy and stability of the ultraviolet signal, avoid excessive deviation of the detection results caused by interference from environmental factors, and significantly reduce the frequency of false alarms.

[0025] In order to achieve the above-mentioned purpose, the third aspect of the present invention proposes an ultraviolet partial discharge detection device, wherein the device is applied to a gallium nitride ultraviolet sensor and executes the ultraviolet partial discharge detection method of the aforementioned embodiment of the present invention, and the device includes: an acquisition module, used to obtain an initial ultraviolet detection signal and an environmental parameter detection signal, and pre-process the initial ultraviolet detection signal and the environmental parameter detection signal respectively to obtain an actual ultraviolet detection signal and a drift compensation value; a compensation module, used to compensate the actual ultraviolet detection signal according to the drift compensation value when it is determined that the gallium nitride ultraviolet sensor is in a real partial discharge state according to the actual ultraviolet detection signal; and a processing module, used to obtain the real ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal according to the compensated actual ultraviolet detection signal.

[0026] According to an embodiment of the present invention, the ultraviolet partial discharge detection device acquires an initial ultraviolet detection signal and an environmental parameter detection signal through an acquisition module, and preprocesses the initial ultraviolet detection signal and the environmental parameter detection signal to obtain an actual ultraviolet detection signal and a drift compensation value. Furthermore, when the compensation module determines that the gallium nitride ultraviolet sensor is in a true partial discharge state based on the actual ultraviolet detection signal, it compensates the actual ultraviolet detection signal according to the drift compensation value. Furthermore, the processing module obtains the true ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal based on the compensated actual ultraviolet detection signal. This improves the detection accuracy and stability of the ultraviolet signal, avoids excessive deviation in the detection results due to interference from environmental factors, and significantly reduces the frequency of false alarms.

[0027] In order to achieve the above-mentioned purpose, a fourth embodiment of the present invention provides an ultraviolet sensor, including the ultraviolet partial discharge detection device of the aforementioned embodiment of the present invention.

[0028] According to the ultraviolet sensor of the embodiment of the present invention, by adopting the ultraviolet partial discharge detection device of the above-mentioned embodiment of the present invention, the detection accuracy and stability of the ultraviolet signal can be improved, and the excessive deviation of the detection result caused by interference from environmental factors can be avoided, and the frequency of false alarms can be significantly reduced.

[0029] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 1 is a flow chart of a method for detecting ultraviolet partial discharge according to one embodiment of the present invention;

[0031] Figure 2 is a schematic flow chart of an ultraviolet partial discharge detection method according to another embodiment of the present invention;

[0032] Figure 3 2 is a schematic structural diagram of an ultraviolet partial discharge detection device according to an embodiment of the present invention;

[0033] Figure 4 Schematic diagram of the structure of the ultraviolet sensor according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0035] The following describes the ultraviolet partial discharge detection method and device, storage medium, and ultraviolet sensor according to embodiments of the present invention with reference to the accompanying drawings.

[0036] Figure 1 1 is a flow chart of a method for detecting ultraviolet partial discharge according to an embodiment of the present invention.

[0037] Specifically, in some embodiments of the present invention, the UV partial discharge detection method is applied to a GaN UV sensor, such as Figure 1 As shown, the UV partial discharge detection method includes:

[0038] S101 , obtaining an initial ultraviolet detection signal and an environmental parameter detection signal, and preprocessing the initial ultraviolet detection signal and the environmental parameter detection signal respectively to obtain an actual ultraviolet detection signal and a drift compensation value.

[0039] Specifically, in this embodiment, the gallium nitride ultraviolet sensor can be installed around or at key locations of the device to be detected, so that it can directly receive the ultraviolet light signal generated by the device during partial discharge, that is, the initial ultraviolet detection signal. The environmental parameters mainly involve temperature and humidity, and then the temperature sensor and the humidity sensor can be installed around or at key locations of the gallium nitride ultraviolet sensor, so that the temperature detection signal and the humidity detection signal can be obtained. After obtaining the initial ultraviolet detection signal, the temperature detection signal and the humidity detection signal, the initial ultraviolet detection signal, the temperature detection signal and the humidity detection signal can be denoised and filtered to obtain the actual ultraviolet detection signal and the drift compensation value.

[0040] S102 : When it is determined according to the actual ultraviolet detection signal that the gallium nitride ultraviolet sensor is in a real partial discharge state, the actual ultraviolet detection signal is compensated according to the drift compensation value.

[0041] Specifically, in this embodiment, the slope corresponding to the actual ultraviolet detection signal can be obtained. When the slope corresponding to the actual ultraviolet detection signal is greater than a preset slope threshold, and it is determined according to the dynamic recovery model that the actual ultraviolet detection signal has not recovered, it is determined that the gallium nitride ultraviolet sensor is in a real partial discharge state. When it is determined that the gallium nitride ultraviolet sensor is in a real partial discharge state, the difference between the actual ultraviolet detection signal and the drift compensation value can be obtained, and the difference can be used as the compensated actual ultraviolet detection signal to eliminate the signal drift caused by environmental factors, thereby obtaining a compensated ultraviolet detection signal that more accurately and truly reflects the partial discharge situation.

[0042] S103 , obtaining a true ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal according to the compensated actual ultraviolet detection signal.

[0043] Specifically, in this embodiment, after obtaining the actual compensated UV detection signal, a suitable UV PD intensity calculation model and algorithm can be used to convert the actual compensated UV detection signal into a corresponding UV PD intensity value. For example, the actual UV PD intensity corresponding to the initial UV detection signal can be obtained using the following formula:

[0044] U=K1×U_true+ K2×Uk,

[0045] Wherein, U is the true UV PD intensity, U_true is the amplitude of the actual UV detection signal after compensation, Uk is the slope of the actual UV detection signal after compensation, and K1 and K2 are constant coefficients. In addition, the present invention does not impose specific limitations on the calculation method for obtaining the true UV PD intensity corresponding to the UV detection signal.

[0046] Furthermore, in some embodiments of the present invention, the initial ultraviolet detection signal is preprocessed, including: performing high-pass filtering and adaptive notch filtering on the initial ultraviolet detection signal to obtain an actual ultraviolet detection signal.

[0047] Specifically, in this embodiment, an adjustable 1Hz high-pass filter can be used to perform high-pass filtering on the initial ultraviolet detection signal, wherein the high-pass filter allows signals with frequencies higher than 1Hz to pass through, while blocking low-frequency signals, and can effectively filter out low-frequency interference below 1Hz, such as the slow change of ambient light, thereby removing low-frequency noise and improving the purity of the signal. At the same time, the high-pass filter also has the characteristic of a group delay of less than 10 microseconds, which means that the transmission delay of the signal in the filter is small and will not have a significant impact on the time domain characteristics of the signal, thereby ensuring the integrity of the signal. In addition, in order to further improve the signal quality, a 500-fold oversampling constraint based on the 20ns pulse rising edge is also adopted. Through oversampling technology, the rapidly changing part of the signal can be processed more accurately, and the restoration of the signal can be improved, so that the signal after high-pass filtering can more truly reflect the characteristics of the original ultraviolet signal. Next, the high-pass filtered signal is subjected to adaptive notch filtering. The adaptive notch filter can dynamically remove interference signals of specific frequencies. Its center frequency can be dynamically tracked and adjusted within the range of 0.5Hz to 1Hz to adapt to interference conditions of different frequencies. The adaptive notch filter can track and suppress interference of specific frequencies in real time, such as 50Hz or 60Hz power frequency interference, thereby further improving the purity of the signal and providing a more reliable data foundation for subsequent analysis and processing. Through the above-mentioned high-pass filtering and adaptive notch filtering processing, the low-frequency noise and specific frequency interference in the initial UV detection signal can be effectively removed, and a more accurate and purer actual UV detection signal can be obtained.

[0048] It should be noted that high-pass filtering and adaptive notch filtering of the initial UV detection signal not only removes low-frequency ambient light interference but also specifically suppresses electromagnetic noise interference at specific frequencies. UV partial discharge sensors are generally used to monitor electrical equipment in the power supply sector, such as switchgear, ring main units, converters, cables and connectors, GIS, and high-voltage converter valves. In these applications, electromagnetic noise interference is typically based on the 50 Hz power frequency and specific multiples of that frequency, such as 3, 5, 7, and 13. The corresponding filter combination parameters were selected based on multiple experimental iterations and optimization of the GaN sensor's signal characteristics (20 ns pulse rising edge).

[0049] High-pass filtering, such as fixed-frequency notch filtering, requires precise parameter configuration to ensure effective rejection of interference noise while preserving the 20ns rising edge of the partial discharge signal. For example, setting the high-pass filter cutoff frequency to 1Hz and controlling the group delay to less than 10 microseconds requires repeated testing to understand the signal characteristics of the GaN sensor. Low-frequency interference below 1Hz (such as gradually increasing ambient light) has a particularly significant impact on measurement results. Excessive increases in group delay can slow down "rapid" signal changes. The final parameter selection was determined after comprehensive consideration and balance. Adaptive notch filtering requires the filter to dynamically adjust its center frequency to accommodate power frequency interference, such as 50Hz and 60Hz. Conversely, using high-pass filtering or fixed-frequency notch filtering alone, or improperly configuring the parameters, will result in the sensor failing to effectively reject interference signals and may even filter out critical signals.

[0050] Furthermore, in some embodiments of the present invention, the environmental parameter detection signal includes a temperature detection signal and a humidity detection signal, and the environmental parameter detection signal is preprocessed, including: obtaining a temperature offset value and a humidity offset value based on the temperature detection signal and the humidity detection signal; and obtaining a drift compensation value based on the temperature offset value and the humidity offset value.

[0051] Specifically, in this embodiment, the essence of partial discharge detection is to capture the ultraviolet signal generated when the insulation of electrical equipment deteriorates through the sensor. For gallium nitride ultraviolet sensors, temperature and humidity are the most direct and critical environmental interference sources that affect the stability of their output signals. Temperature increases will cause the band gap of gallium nitride materials to decrease and the carrier concentration to increase, thereby increasing the dark current of the sensor (the background current in the absence of ultraviolet light), which manifests as signal baseline drift. At the same time, in a high humidity environment, the surface of the gallium nitride ultraviolet sensor is prone to adsorbing water molecules to form a thin water film. Ions in the water film (such as 、 ) will alter the charge distribution on the sensor surface, reducing the efficiency of photoelectric signal acquisition and even introducing additional noise. Experimental verification has shown that this technical solution selects the two parameters with the greatest impact on partial discharge monitoring from a variety of environmental compensation parameters for calculation and compensation. This ensures that the model fully reflects actual conditions while effectively reducing the amount of calculation required to meet the actual computing power requirements of the sensor module.

[0052] The temperature detection signal, acquired in real time by a high-precision temperature sensor, is then fed into a pre-calibrated linear model. This model, built based on historical data and experimental results, quantifies the impact of temperature changes on the device's output signal, thereby generating a temperature offset value. Similarly, the humidity detection signal, acquired by a high-precision humidity sensor, is processed through a similar linear model to obtain a humidity offset value. Furthermore, the temperature and humidity offset values ​​can be calculated using the following formulas:

[0053]

[0054]

[0055] in, Indicates the temperature offset value, represents the temperature offset coefficient, Indicates the current temperature. Indicates the reference temperature, Indicates the humidity offset value, represents the humidity offset coefficient, Indicates the current humidity. Indicates the reference humidity. After obtaining the temperature offset value and the humidity offset value, the temperature offset value and the humidity offset value can be summed and used as the drift compensation value.

[0056] It should be noted that the environmental compensation parameters may also include a pressure detection signal, and the present invention does not specifically limit the specific types of environmental compensation parameters. The temperature offset coefficient may preferably be 0.05 mV / °C, with the signal baseline rising by 0.05 mV for every 1°C increase in temperature. The humidity offset coefficient may preferably be 0.03 mV / %, with the signal baseline rising by 0.03 mV for every 1% increase in humidity.

[0057] It's important to note that in partial discharge detection, temperature and humidity don't interfere with sensor signals independently, but rather have a synergistic effect. The drift value resulting from their combined effects is not the linear sum of their individual effects. Therefore, a multivariate linear regression model is needed to account for their combined effects. In electrical equipment operating environments (such as outdoor substations and underground cable trenches), temperature and humidity variations are often strongly coupled (e.g., high temperatures in summer are associated with high humidity, and low temperatures in winter are associated with low humidity). By fitting multiple sets of experimental data (including drift values ​​under different temperature-humidity combinations), a multivariate linear regression model can extract the statistical patterns of their combined effects, enabling the model to adapt to complex environmental variations in real applications, rather than simply applying to ideal scenarios where a single variable changes. Furthermore, the model and parameter selection must be calibrated based on the physical properties of the sensor's gallium nitride material, specifically the effect of temperature on the bandgap and humidity on the sensor surface. This is achieved through extensive experimental calibration and optimization. This allows for more precise compensation of the impact of varying environmental factors on device output, improving the accuracy and stability of measurement results.

[0058] Furthermore, in some embodiments of the present invention, Figure 2 As shown, the UV partial discharge detection method also includes:

[0059] S201, obtaining the slope corresponding to the actual ultraviolet detection signal.

[0060] Specifically, in this embodiment, the slope of the ultraviolet detection signal is calculated in real time by the system to obtain a real-time slope, wherein the unit of the slope is V / μs (volts per microsecond).

[0061] S202 : When the slope corresponding to the actual ultraviolet detection signal is greater than a preset slope threshold and it is determined according to the dynamic recovery model that the actual ultraviolet detection signal has not recovered, it is determined that the gallium nitride ultraviolet sensor is in a real partial discharge state.

[0062] Specifically, in this embodiment, the preset slope threshold can be preferably 30V / μs. When the slope corresponding to the actual UV detection signal exceeds the preset slope threshold, the system will initially determine that a partial discharge may have occurred. The system then uses a dynamic recovery model (τ = 8ms) to further determine the presence of a partial discharge. The dynamic recovery model can describe and predict the recovery process of the GaN UV sensor. When the GaN UV sensor is in the recovery phase, the dynamic recovery model determines a time range based on the recovery time constant (τ = 8ms). Within this time range, the system temporarily blocks the output signal to avoid misinterpreting the recovery phase signal as a true partial discharge. Only when the signal slope exceeds the threshold and exceeds the predicted recovery phase time range does the system finally determine that the GaN UV sensor is in a true partial discharge state and trigger the corresponding partial discharge alarm. This effectively improves the accuracy of partial discharge detection, reduces the probability of false alarms and missed alarms, and ensures reliable system operation. It should be noted that the dynamic recovery model can be updated based on temperature changes.

[0063] It should be noted that the fitting formula of the dynamic recovery model is as follows:

[0064]

[0065] in, is the output voltage at time t corresponding to the actual UV detection signal; is the initial voltage after UV excitation corresponding to the actual UV detection signal (the maximum value of the received excitation voltage change), As time goes by, it tends to 0; is the constant of the recovery time, which is determined by the carrier recombination characteristics and is measured to be 7.2-8.5ms, and can be preferably 8ms; is the steady-state baseline voltage, which is the reference value after environmental drift compensation; when the output voltage corresponding to the actual ultraviolet detection signal does not meet the above fitting formula, it is determined that the actual ultraviolet detection signal has not recovered.

[0066] Furthermore, in some embodiments of the present invention, compensating the actual ultraviolet detection signal according to the drift compensation value includes: obtaining a difference between the actual ultraviolet detection signal and the drift compensation value, and using the difference as the compensated actual ultraviolet detection signal.

[0067] Specifically, in this embodiment, the difference between the actual ultraviolet detection signal and the drift compensation value is obtained, and the difference is used as the compensated actual ultraviolet detection signal. For example, when the actual ultraviolet detection signal U_clean is equal to 4.0mV and the drift compensation value ΔU_drift is equal to 1.10mV, the compensated actual ultraviolet detection signal U_true = U_clean - ΔU_drift = 4.0mV - 1.10mV = 2.90mV.

[0068] Furthermore, in some embodiments of the present invention, the ultraviolet partial discharge detection method also includes: when the slope corresponding to the actual ultraviolet detection signal is less than or equal to a preset slope threshold, determining that the gallium nitride ultraviolet sensor is in a no partial discharge state, and controlling the gallium nitride ultraviolet sensor to enter a low power consumption mode.

[0069] Specifically, in this embodiment, the preset slope threshold can be preferably 30V / μs, and the preset slope threshold is determined based on the analysis of a large amount of experimental data and an in-depth study of the characteristics of the partial discharge signal. When the slope corresponding to the detected actual ultraviolet detection signal is less than or equal to the preset slope threshold, it indicates that no partial discharge phenomenon has occurred in the current environment, and the sensor can safely enter the low power mode. The low power mode is achieved by reducing the sampling rate of the sensor and reducing the energy consumption of the signal processing circuit, thereby significantly reducing energy consumption without affecting the normal detection function. In addition, the system also has a fast wake-up mechanism. Once it is detected that the slope corresponding to the actual ultraviolet detection signal exceeds the preset slope threshold again, the sensor can be quickly restored from the low power mode to the normal working state to ensure that no potential partial discharge events are missed. This feature makes the ultraviolet partial discharge detection method of the present invention not only efficient and reliable, but also energy-saving and environmentally friendly, and is particularly suitable for application scenarios that require long-term continuous monitoring.

[0070] In summary, according to the ultraviolet partial discharge detection method of an embodiment of the present invention, by obtaining an initial ultraviolet detection signal and an environmental parameter detection signal, and preprocessing the initial ultraviolet detection signal and the environmental parameter detection signal respectively, to obtain an actual ultraviolet detection signal and a drift compensation value, and when it is determined that the gallium nitride ultraviolet sensor is in a real partial discharge state according to the actual ultraviolet detection signal, the actual ultraviolet detection signal is compensated according to the drift compensation value, and the actual ultraviolet partial discharge intensity corresponding to the ultraviolet detection signal is obtained based on the compensated actual ultraviolet detection signal. In this way, the detection accuracy and stability of the ultraviolet signal can be improved, and the deviation of the detection result caused by the interference of environmental factors can be avoided, and the frequency of false alarms can be significantly reduced.

[0071] Based on the ultraviolet partial discharge detection method proposed in the aforementioned embodiment of the present invention, the embodiment of the present invention further proposes a computer-readable storage medium, on which an ultraviolet partial discharge detection program is stored. When the ultraviolet partial discharge detection program is executed by a processor, the ultraviolet partial discharge detection method of the aforementioned embodiment of the present invention is implemented.

[0072] According to the computer-readable storage medium of an embodiment of the present invention, the ultraviolet partial discharge detection program is executed by a processor, which can improve the detection accuracy and stability of the ultraviolet signal, avoid excessive deviation of the detection results caused by interference from environmental factors, and significantly reduce the frequency of false alarms.

[0073] Figure 3Schematic diagram of the structure of an ultraviolet partial discharge detection device according to an embodiment of the present invention.

[0074] Specifically, the ultraviolet partial discharge detection device is applied to the gallium nitride ultraviolet sensor and performs the ultraviolet partial discharge detection method of the above embodiment of the present invention, such as Figure 3 As shown, the ultraviolet partial discharge detection device 100 includes an acquisition module 10 , a compensation module 20 and a processing module 30 .

[0075] Among them, the acquisition module 10 is used to obtain the initial ultraviolet detection signal and the environmental parameter detection signal, and pre-process the initial ultraviolet detection signal and the environmental parameter detection signal respectively to obtain the actual ultraviolet detection signal and the drift compensation value; the compensation module 20 is used to compensate the actual ultraviolet detection signal according to the drift compensation value when it is determined that the gallium nitride ultraviolet sensor is in a real partial discharge state according to the actual ultraviolet detection signal; the processing module 30 is used to obtain the real ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal based on the compensated actual ultraviolet detection signal.

[0076] In some embodiments of the present invention, the acquisition module 10 is specifically configured to perform high-pass filtering and adaptive notch filtering on the initial ultraviolet detection signal to obtain the actual ultraviolet detection signal.

[0077] In some embodiments of the present invention, the environmental parameter detection signal includes a temperature detection signal and a humidity detection signal. The acquisition module 10 is specifically configured to obtain the temperature offset value and the humidity offset value according to the temperature detection signal and the humidity detection signal using the following formula:

[0078]

[0079]

[0080] in, Indicates the temperature offset value, represents the temperature offset coefficient, Indicates the current temperature. Indicates the reference temperature, Indicates the humidity offset value, represents the humidity offset coefficient, Indicates the current humidity. Indicates the reference humidity; the sum of the temperature offset value and the humidity offset value is used as the drift compensation value.

[0081] In some embodiments of the present invention, the acquisition module 10 is further used to obtain a slope corresponding to the actual ultraviolet detection signal; the processing module 30 is further used to determine that the gallium nitride ultraviolet sensor is in a real partial discharge state when the slope corresponding to the actual ultraviolet detection signal is greater than a preset slope threshold and the actual ultraviolet detection signal is determined to have not recovered according to the dynamic recovery model, wherein the fitting formula of the dynamic recovery model is as follows:

[0082]

[0083] in, is the output voltage at time t corresponding to the actual ultraviolet detection signal; is the initial voltage after ultraviolet excitation corresponding to the actual ultraviolet detection signal; is the constant of recovery time; is a steady-state baseline voltage. When the output voltage corresponding to the actual ultraviolet detection signal does not conform to the above fitting formula, it is determined that the actual ultraviolet detection signal has not recovered.

[0084] In some embodiments of the present invention, the compensation module 20 is specifically configured to obtain a difference between the actual ultraviolet detection signal and the drift compensation value, and use the difference as the compensated actual ultraviolet detection signal.

[0085] In some embodiments of the present invention, the actual UV partial discharge intensity corresponding to the initial UV detection signal is obtained by the following formula:

[0086] U=K1×U_true+ K2×Uk,

[0087] Among them, U is the true UV partial discharge intensity, U_true is the amplitude of the actual UV detection signal after compensation, Uk is the slope of the actual UV detection signal after compensation, and K1 and K2 are constant coefficients.

[0088] In some embodiments of the present invention, the processing module 30 is further used to determine that the gallium nitride ultraviolet sensor is in a state of no partial discharge when the slope corresponding to the actual ultraviolet detection signal is less than or equal to a preset slope threshold, and control the gallium nitride ultraviolet sensor to enter a low power consumption mode.

[0089] It should be noted that, for other specific implementations of the ultraviolet partial discharge detection device proposed in the embodiment of the present invention, reference can be made to the specific implementations of the ultraviolet partial discharge detection method in the aforementioned embodiment of the present invention, and will not be repeated here to reduce redundancy.

[0090] According to an embodiment of the present invention, the ultraviolet partial discharge detection device acquires an initial ultraviolet detection signal and an environmental parameter detection signal through an acquisition module, and preprocesses the initial ultraviolet detection signal and the environmental parameter detection signal to obtain an actual ultraviolet detection signal and a drift compensation value. Furthermore, when the compensation module determines that the gallium nitride ultraviolet sensor is in a true partial discharge state based on the actual ultraviolet detection signal, it compensates the actual ultraviolet detection signal according to the drift compensation value. Furthermore, the processing module obtains the true ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal based on the compensated actual ultraviolet detection signal. This improves the detection accuracy and stability of the ultraviolet signal, avoids excessive deviation in the detection results due to interference from environmental factors, and significantly reduces the frequency of false alarms.

[0091] Figure 4 Schematic diagram of the structure of the ultraviolet sensor according to an embodiment of the present invention.

[0092] like Figure 4 As shown, the ultraviolet sensor 1000 includes the ultraviolet partial discharge detection device 100 according to the above-mentioned embodiment of the present invention.

[0093] According to the ultraviolet sensor of the embodiment of the present invention, by adopting the ultraviolet partial discharge detection device of the above-mentioned embodiment of the present invention, the detection accuracy and stability of the ultraviolet signal can be improved, and the excessive deviation of the detection result caused by interference from environmental factors can be avoided, and the frequency of false alarms can be significantly reduced.

[0094] It should be noted that the logic and / or steps represented in flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic device), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and a portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner if necessary, and then storing it in a computer memory.

[0095] It should be understood that various components of the present invention may be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods may be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof may be used: a discrete logic circuit having logic gate circuits for implementing logic functions on data signals, an application-specific integrated circuit having suitable combinational logic gate circuits, a programmable gate array (PGA), a field-programmable gate array (FPGA), etc.

[0096] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0097] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0098] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0099] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0100] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0101] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for detecting ultraviolet partial discharge, characterized in that: The method is applied to a gallium nitride ultraviolet sensor, and the method comprises: Acquiring an initial ultraviolet detection signal and an environmental parameter detection signal, and preprocessing the initial ultraviolet detection signal and the environmental parameter detection signal respectively to obtain an actual ultraviolet detection signal and a drift compensation value; When it is determined according to the actual ultraviolet detection signal that the gallium nitride ultraviolet sensor is in a real partial discharge state, compensating the actual ultraviolet detection signal according to the drift compensation value; Obtaining a true ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal according to the compensated actual ultraviolet detection signal; Determining, according to the actual ultraviolet detection signal, that the gallium nitride ultraviolet sensor is in a real partial discharge state includes: Obtaining the slope corresponding to the actual ultraviolet detection signal; When the slope corresponding to the actual ultraviolet detection signal is greater than a preset slope threshold and it is determined according to the dynamic recovery model that the actual ultraviolet detection signal has not recovered, it is determined that the gallium nitride ultraviolet sensor is in a real partial discharge state, wherein the fitting formula of the dynamic recovery model is as follows: in, is the output voltage at time t corresponding to the actual ultraviolet detection signal; is the initial voltage after ultraviolet excitation corresponding to the actual ultraviolet detection signal; is the constant of recovery time; is a steady-state baseline voltage, and when the output voltage corresponding to the actual ultraviolet detection signal does not conform to the above fitting formula, it is determined that the actual ultraviolet detection signal has not recovered; The compensating the actual ultraviolet detection signal according to the drift compensation value includes: Obtaining a difference between the actual ultraviolet detection signal and the drift compensation value, and using the difference as the compensated actual ultraviolet detection signal; The actual UV partial discharge intensity corresponding to the initial UV detection signal is obtained by the following formula: U=K1×U_true+ K2×Uk, Among them, U is the true UV partial discharge intensity, U_true is the amplitude of the actual UV detection signal after compensation, Uk is the slope of the actual UV detection signal after compensation, and K1 and K2 are constant coefficients.

2. The ultraviolet partial discharge detection method according to claim 1, wherein Preprocessing the initial ultraviolet detection signal includes: The initial ultraviolet detection signal is subjected to high-pass filtering and adaptive notch filtering to obtain the actual ultraviolet detection signal.

3. The ultraviolet partial discharge detection method according to claim 1, wherein The environmental parameter detection signal includes a temperature detection signal and a humidity detection signal, and preprocessing the environmental parameter detection signal includes: According to the temperature detection signal and the humidity detection signal, the temperature offset value and the humidity offset value are obtained by the following formula: in, Indicates the temperature offset value, represents the temperature offset coefficient, Indicates the current temperature. Indicates the reference temperature, Indicates the humidity offset value, represents the humidity offset coefficient, Indicates the current humidity. Indicates the base humidity; The sum of the temperature offset value and the humidity offset value is used as a drift compensation value.

4. The ultraviolet partial discharge detection method according to claim 1, wherein The method further comprises: When the slope corresponding to the actual ultraviolet detection signal is less than or equal to the preset slope threshold, it is determined that the gallium nitride ultraviolet sensor is in a non-partial discharge state, and the gallium nitride ultraviolet sensor is controlled to enter a low power consumption mode.

5. A computer-readable storage medium, characterized in that An ultraviolet partial discharge detection program is stored thereon, and when the ultraviolet partial discharge detection program is executed by the processor, the ultraviolet partial discharge detection method according to any one of claims 1 to 4 is implemented.

6. An ultraviolet partial discharge detection device, characterized in that: The device is applied to a gallium nitride ultraviolet sensor and performs the ultraviolet partial discharge detection method according to any one of claims 1 to 4, and the device comprises: an acquisition module, configured to acquire an initial ultraviolet detection signal and an environmental parameter detection signal, and preprocess the initial ultraviolet detection signal and the environmental parameter detection signal respectively to obtain an actual ultraviolet detection signal and a drift compensation value; a compensation module, configured to compensate the actual ultraviolet detection signal according to the drift compensation value when it is determined that the gallium nitride ultraviolet sensor is in a real partial discharge state according to the actual ultraviolet detection signal; The compensation module is further configured to determine, based on the actual ultraviolet detection signal, whether the gallium nitride ultraviolet sensor is in a real partial discharge state, including: Obtaining the slope corresponding to the actual ultraviolet detection signal; When the slope corresponding to the actual ultraviolet detection signal is greater than a preset slope threshold and it is determined according to the dynamic recovery model that the actual ultraviolet detection signal has not recovered, it is determined that the gallium nitride ultraviolet sensor is in a real partial discharge state, wherein the fitting formula of the dynamic recovery model is as follows: in, is the output voltage at time t corresponding to the actual ultraviolet detection signal; is the initial voltage after ultraviolet excitation corresponding to the actual ultraviolet detection signal; is the constant of recovery time; is a steady-state baseline voltage, and when the output voltage corresponding to the actual ultraviolet detection signal does not conform to the above fitting formula, it is determined that the actual ultraviolet detection signal has not recovered; The compensating the actual ultraviolet detection signal according to the drift compensation value includes: Obtaining a difference between the actual ultraviolet detection signal and the drift compensation value, and using the difference as the compensated actual ultraviolet detection signal; The actual UV partial discharge intensity corresponding to the initial UV detection signal is obtained by the following formula: U=K1×U_true+ K2×Uk, Wherein, U is the true UV PD intensity, U_true is the amplitude of the actual UV detection signal after compensation, Uk is the slope of the actual UV detection signal after compensation, K1 and K2 are constant coefficients; The processing module is used to obtain the real ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal according to the compensated actual ultraviolet detection signal.

7. A UV sensor, characterized in that: Including the ultraviolet partial discharge detection device as described in claim 6.

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