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

Abstract

The invention relates to the technical field of partial discharge detection, in particular 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, and the ultraviolet partial discharge detection method comprises the following steps: acquiring an initial ultraviolet detection signal and an environmental parameter detection signal, preprocessing the initial ultraviolet detection signal and the environmental parameter detection signal 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 acquiring the real ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal according to the compensated actual ultraviolet detection signal. Therefore, the detection precision and stability of the ultraviolet signal can be improved, excessive deviation of a detection result caused by interference of environmental factors is avoided, and the occurrence frequency of false alarms is remarkably reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of partial discharge detection, and particularly 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 detection, the ultraviolet partial discharge detection technology is widely used in the insulation condition monitoring of electrical equipment due to its unique advantages. However, there are many deficiencies in the actual application of related technologies. The accuracy of ultraviolet partial discharge detection is easily affected by environmental factors. For example, the carrier concentration of the sensor material increases exponentially with the increase in temperature, resulting in a large drift of the dark current (background current without partial discharge) and large fluctuations in the signal baseline. In a high-humidity environment, such as coastal areas or rainy seasons, water molecules are easily adsorbed on the sensor surface to form an ion conductive film, which not only reduces the photoelectric conversion efficiency but also introduces random noise, directly leading to the signal-to-noise ratio of the detection signal. In addition, in the early stage of partial discharge development, it is all weak ultraviolet light. In order to ensure the sensitivity of the sensor, weak ultraviolet signals need to be extracted. However, the actual operating environment of electrical equipment is relatively harsh, which has a negative impact on the operating characteristics of the partial discharge sensor, seriously affecting the effective extraction of partial discharge signals, thereby reducing the accuracy of ultraviolet partial discharge detection. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems in the related technologies to some extent. For this reason, the first object of the present invention is to provide an ultraviolet partial discharge detection method, which can improve the detection accuracy and stability of ultraviolet signals, avoid excessive deviation of detection results caused by environmental factor interference, and significantly reduce the occurrence frequency of false alarms.

[0004] The 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] The fourth object of the present invention is to provide an ultraviolet sensor.

[0007] To achieve the above object, an embodiment of the first aspect of the present invention provides an ultraviolet partial discharge detection method, where 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 respectively preprocessing the initial ultraviolet detection signal and the environmental parameter detection signal 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 true 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 true ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal according to the compensated actual ultraviolet detection signal.

[0008] According to the ultraviolet partial discharge detection method of the embodiment of the present invention, by obtaining an initial ultraviolet detection signal and an environmental parameter detection signal, and respectively preprocessing the initial ultraviolet detection signal and the environmental parameter detection signal 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 true 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 true ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal according to the compensated actual ultraviolet detection signal. Thus, the detection accuracy and stability of the ultraviolet signal can be improved, and the deviation of the detection result caused by environmental factor interference can be avoided, and the occurrence frequency of false alarms is significantly reduced.

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

[0010] According to an embodiment of the present invention, the environmental parameter detection signal includes a temperature detection signal and a humidity detection signal. 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 through the following formula:

[0011]

[0012] where represents the temperature offset value, represents the temperature offset coefficient, represents the current temperature, represents the reference temperature, represents the humidity offset value, represents the humidity offset coefficient, represents the current humidity, represents the reference humidity; the sum of the temperature offset value and the humidity offset value is used as the drift compensation value.

[0013] According to an embodiment of the present invention, the method further 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 that the actual ultraviolet detection signal has not recovered according to the dynamic recovery model, it is determined that the gallium nitride ultraviolet sensor is in a true partial discharge state, where the fitting formula of the dynamic recovery model is as follows:

[0014] where 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 the recovery time; is the 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.

[0015] According to an embodiment of the present invention, compensating the actual ultraviolet detection signal according to the drift compensation value includes: obtaining the difference between the actual ultraviolet detection signal and the drift compensation value, and using the difference as the compensated actual ultraviolet detection signal.

[0016] According to an embodiment of the present invention, the true ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal is obtained through the following formula: U = K1×U_true + K2×Uk, where U is the true ultraviolet partial discharge intensity, U_true is the amplitude of the compensated actual ultraviolet detection signal, Uk is the slope of the compensated actual ultraviolet detection signal, and K1, K2 are constant coefficients.

[0017] According to an 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, 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 the low-power mode.

[0018] To achieve the above object, an embodiment of the second aspect of the present invention proposes a computer-readable storage medium, on which an ultraviolet partial discharge detection program is stored, and when the ultraviolet partial discharge detection program is executed by a processor, the ultraviolet partial discharge detection method of the foregoing embodiment of the present invention is implemented.

[0019] According to the computer-readable storage medium of the embodiments of the present invention, by executing an ultraviolet partial discharge detection program through a processor, the detection accuracy and stability of ultraviolet signals can be improved, the deviation of detection results caused by environmental factor interference can be avoided, and the occurrence frequency of false alarms can be significantly reduced.

[0020] To achieve the above object, an embodiment of the third aspect of the present invention provides an ultraviolet partial discharge detection device. The device is applied to a gallium nitride ultraviolet sensor and executes the ultraviolet partial discharge detection method of the foregoing embodiments of the present invention. The device includes: 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 true partial discharge state based on the actual ultraviolet detection signal; and a processing module, configured to obtain the true ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal according to the compensated actual ultraviolet detection signal.

[0021] According to the ultraviolet partial discharge detection device of the embodiments of the present invention, the acquisition module acquires an initial ultraviolet detection signal and an environmental parameter detection signal, and preprocesses 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 true partial discharge state based on the actual ultraviolet detection signal, the compensation module compensates the actual ultraviolet detection signal according to the drift compensation value, and the processing module obtains the true ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal according to the compensated actual ultraviolet detection signal. Thus, the detection accuracy and stability of ultraviolet signals can be improved, the deviation of detection results caused by environmental factor interference can be avoided, and the occurrence frequency of false alarms can be significantly reduced.

[0022] To achieve the above object, an embodiment of the fourth aspect of the present invention provides an ultraviolet sensor, including the ultraviolet partial discharge detection device of the foregoing embodiments of the present invention.

[0023] According to the ultraviolet sensor of the embodiments of the present invention, by adopting the ultraviolet partial discharge detection device of the above embodiments of the present invention, the detection accuracy and stability of ultraviolet signals can be improved, the deviation of detection results caused by environmental factor interference can be avoided, and the occurrence frequency of false alarms can be significantly reduced.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0025] Figure 1It is a schematic flowchart of the ultraviolet partial discharge detection method according to an embodiment of the present invention; Figure 2 It is a schematic flowchart of the ultraviolet partial discharge detection method according to another embodiment of the present invention; Figure 3 It is a schematic structural diagram of the ultraviolet partial discharge detection device according to an embodiment of the present invention; Figure 4 It is a schematic structural diagram of the ultraviolet sensor according to an embodiment of the present invention. Detailed implementation manners

[0026] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] The ultraviolet partial discharge detection method, device, storage medium, and ultraviolet sensor according to the embodiments of the present invention will be described below with reference to the drawings.

[0028] Figure 1 It is a schematic flowchart of the ultraviolet partial discharge detection method according to an embodiment of the present invention.

[0029] Specifically, in some embodiments of the present invention, the ultraviolet partial discharge detection method is applied to a gallium nitride ultraviolet sensor. As Figure 1 shown, the ultraviolet partial discharge detection method includes: S101, obtaining an initial ultraviolet detection signal and an environmental parameter detection signal, and respectively preprocessing the initial ultraviolet detection signal and the environmental parameter detection signal to obtain an actual ultraviolet detection signal and a drift compensation value.

[0030] Specifically, in this embodiment, the gallium nitride ultraviolet sensor can be installed around or at key parts of the device to be detected, so that it can directly receive the ultraviolet light signal generated during the partial discharge of the device, that is, the initial ultraviolet detection signal. The environmental parameters mainly involve temperature and humidity. Furthermore, a temperature sensor and a humidity sensor can be installed around or at key parts of the gallium nitride ultraviolet sensor, so that a temperature detection signal and a humidity detection signal can be obtained. After obtaining the initial ultraviolet detection signal, temperature detection signal, and humidity detection signal, noise removal processing and filtering processing can be performed on the initial ultraviolet detection signal, temperature detection signal, and humidity detection signal to obtain an actual ultraviolet detection signal and a drift compensation value.

[0031] S102, 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.

[0032] 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 the preset slope threshold and it is determined that the actual ultraviolet detection signal has not recovered according to the dynamic recovery model, it is determined that the gallium nitride ultraviolet sensor is in a true partial discharge state. Furthermore, when it is determined that the gallium nitride ultraviolet sensor is in a true partial discharge state, the difference between the actual ultraviolet detection signal and the drift compensation value can be obtained, and the difference is used as the compensated actual ultraviolet detection signal to eliminate signal drift caused by environmental factors and other factors, so as to obtain a compensated ultraviolet detection signal that more accurately and truly reflects the partial discharge situation.

[0033] S103. Obtain the true ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal according to the compensated actual ultraviolet detection signal.

[0034] Specifically, in this embodiment, after obtaining the compensated actual ultraviolet detection signal, a suitable ultraviolet partial discharge intensity calculation model and algorithm can be used to convert the compensated actual ultraviolet detection signal into a corresponding ultraviolet partial discharge intensity value. For example, the true ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal can be obtained through the following formula: U = K1×U_true + K2×Uk, where U is the true ultraviolet partial discharge intensity, U_true is the amplitude of the compensated actual ultraviolet detection signal, Uk is the slope of the compensated actual ultraviolet detection signal, and K1 and K2 are constant coefficients. In addition, the present invention may not specifically limit the calculation method for obtaining the true ultraviolet partial discharge intensity corresponding to the ultraviolet detection signal.

[0035] Furthermore, in some embodiments 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.

[0036] Specifically, in this embodiment, an adjustable 1 Hz high-pass filter can be used to perform high-pass filtering on the initial ultraviolet detection signal. The high-pass filter allows signals with frequencies higher than 1 Hz to pass through while blocking low-frequency signals, effectively filtering out low-frequency interference below 1 Hz, 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 that the group delay is less than 10 microseconds, which means that the transmission delay of the signal in the filter is small and will not have an obvious impact on the time-domain characteristics of the signal, ensuring the integrity of the signal. In addition, in order to further improve the signal quality, a 500-fold oversampling constraint based on the 20 ns pulse rising edge is also adopted. Through the oversampling technique, the fast-changing part of the signal can be processed more precisely, improving the restoration degree of the signal, so that the signal after high-pass filtering can more truly reflect the characteristics of the original ultraviolet signal. Immediately afterwards, the signal after high-pass filtering is subjected to adaptive notch filtering. The adaptive notch filter can dynamically remove interference signals at specific frequencies, and its center frequency can be dynamically tracked and adjusted in the range of 0.5 Hz to 1 Hz to adapt to different frequency interference situations. The adaptive notch filter can track and suppress interference at specific frequencies in real time, such as 50 Hz or 60 Hz power frequency interference, thereby further improving the purity of the signal and providing a more reliable data basis for subsequent analysis and processing. Through the above high-pass filtering and adaptive notch filtering, the low-frequency noise and specific frequency interference in the initial ultraviolet detection signal can be effectively removed, and a more accurate and pure actual ultraviolet detection signal can be obtained.

[0037] It should be noted that by performing high-pass filtering and adaptive notch filtering on the initial ultraviolet detection signal, not only the low-frequency ambient light interference is filtered out, but also the specific frequency electromagnetic noise interference is specifically suppressed. Since ultraviolet partial discharge sensors are generally used for monitoring electrical equipment in the power supply field, such as switch cabinets, ring main units, converters, cables and joints, GIS, high-voltage converter valves, etc. In these application scenarios, the electromagnetic noise interference that is easily present is generally based on the 50 Hz power frequency and specific multiple frequencies of the power frequency such as 3, 5, 7, 13, etc. The selection of the corresponding filter combination parameters is obtained through multiple experimental iterations and optimizations based on the signal characteristics (20 ns pulse rising edge) of the gallium nitride sensor.

[0038] Adopting high-pass filtering technology, such as notch filtering with a fixed frequency, precise parameter configuration must be carried out to ensure that while retaining the 20-ns-level rising edge of the partial discharge signal, interference noise can be effectively excluded. For example, setting the cut-off frequency of the high-pass filter to 1 Hz and controlling the group delay within 10 microseconds requires repeated tests to grasp the signal characteristics of the gallium nitride sensor. For low-frequency interference below 1 Hz (such as the gradual increase in ambient light), its impact on the measurement results is particularly significant. Excessive increase in the group delay will cause the "rapid changes" of the signal to become sluggish. After comprehensive consideration and balance, the parameter selection is finally determined. The adaptive notch filtering technology requires the filter to follow power frequency interferences such as 50 Hz and 60 Hz to achieve the function of "dynamically adjusting" the center frequency. On the contrary, if only high-pass filtering or fixed-frequency notch filtering is used alone, or the parameter configuration is improper, it will cause the sensor to be unable to effectively exclude interference signals and may even filter out key useful signals by mistake.

[0039] Furthermore, in some embodiments of the present invention, the environmental parameter detection signal includes a temperature detection signal and a humidity detection signal. 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; obtaining a drift compensation value according to the temperature offset value and the humidity offset value.

[0040] 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 a sensor. For gallium nitride ultraviolet sensors, temperature and humidity are the most direct and crucial environmental interference sources affecting the stability of their output signals. An increase in temperature will cause the bandgap width of the gallium nitride material to decrease and the carrier concentration to increase, thereby increasing the dark current (background current without ultraviolet light) of the sensor, manifested as a drift of the signal baseline. At the same time, in a high-humidity environment, water molecules are easily adsorbed on the surface of the gallium nitride ultraviolet sensor to form a thin water film. Ions in the water film (such as , ) will change the charge distribution on the sensor surface, resulting in a decrease in the acquisition efficiency of the optoelectronic signal and even introducing additional noise signals. Through experimental verification, this technical solution selects the two parameters that have the greatest impact on partial discharge monitoring among various environmental compensation parameters for calculation and compensation, ensuring that the model can fully reflect the actual situation, effectively reducing the calculation amount at the same time, and meeting the actual calculation ability requirements of the sensor module.

[0041] After the temperature detection signal is collected in real time by a high-precision temperature sensor, it is input into a pre-calibrated linear model. This model is fitted based on historical data and experimental results and can quantify the impact of temperature changes on the device output signal, thereby obtaining the temperature offset value. Similarly, after the humidity detection signal is acquired by a high-precision humidity sensor, it is also processed by a similar linear model to obtain the humidity offset value. In addition, the temperature offset value and the humidity offset value can be calculated according to the following formula:

[0042]

[0043] Wherein, represents the temperature offset value, represents the temperature offset coefficient, represents the current temperature, represents the reference temperature, represents the humidity offset value, represents the humidity offset coefficient, represents the current humidity, represents 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 the sum value is used as the drift compensation value.

[0044] It should be noted that the environmental compensation parameter can also include the pressure detection signal, and the present invention does not specifically limit the specific types included in the environmental compensation parameter. The temperature offset coefficient can preferably be 0.05 mV / °C, and for every 1°C increase in temperature, the signal baseline rises by 0.05 mV. The humidity offset coefficient can preferably be 0.03 mV / %, and for every 1% increase in humidity, the signal baseline rises by 0.03 mV.

[0045] It should be noted that in partial discharge detection, the interference of temperature and humidity on the sensor signal is not independent, but there is a synergistic effect. The drift value when the two act together is not equal to the linear superposition of the two acting alone. Therefore, a multiple linear regression model needs to be used to fit the combined action of the two. In the operating environment of electrical equipment (such as outdoor substations, underground cable trenches), the changes in temperature and humidity often have strong coupling (such as high temperature accompanied by high humidity in summer, and low temperature accompanied by low humidity in winter). By fitting multiple sets of experimental data (including drift values under different temperature-humidity combinations), the multiple linear regression model can extract the statistical laws of the combined action of the two, enabling the model to adapt to complex environmental change scenarios in practical applications, rather than only applying to ideal scenarios with single variable changes. At the same time, the selection of this model and parameters needs to be calibrated in combination with the physical properties of the sensor gallium nitride material, that is, the influence of temperature on the bandgap width and the change of humidity on the sensor surface, and is obtained through a large number of experimental calibrations and optimizations. Thus, the influence of environmental factor changes on the device output can be compensated more precisely, and the accuracy and stability of the measurement results can be improved.

[0046] Furthermore, in some embodiments of the present invention, as Figure 2 shown, the ultraviolet partial discharge detection method further includes: S201, obtaining the slope corresponding to the actual ultraviolet detection signal.

[0047] Specifically, in this embodiment, the system calculates the slope of the ultraviolet detection signal in real time to obtain the real-time slope, where the unit of the slope is V / μs (volts per microsecond).

[0048] S202, when the slope corresponding to the actual ultraviolet detection signal is greater than the preset slope threshold and it is determined that the actual ultraviolet detection signal has not recovered according to the dynamic recovery model, it is determined that the gallium nitride ultraviolet sensor is in a true partial discharge state.

[0049] Specifically, in this embodiment, the preset slope threshold can preferably be 30 V / μs. When the slope of the actual ultraviolet detection signal is greater than the preset slope threshold, the system will initially judge that a partial discharge phenomenon may occur. Then, the system further judges in combination with the dynamic recovery model (τ = 8 ms). The dynamic recovery model can describe and predict the recovery process of the gallium nitride ultraviolet sensor. When the gallium nitride ultraviolet sensor is in the recovery period, the dynamic recovery model will determine a time range according to the recovery time constant (τ = 8 ms). Within this time range, the system will temporarily block the output signal to avoid misjudging the signal in the recovery period as a real partial discharge. Only when the signal slope exceeds the threshold and exceeds the predicted time range of the recovery period, the system will finally determine that the gallium nitride ultraviolet sensor is in the real partial discharge state and trigger the corresponding partial discharge alarm, thereby effectively improving the accuracy of partial discharge detection, reducing the probability of false alarms and missed alarms, and ensuring the reliable operation of the system. It should be noted that the dynamic recovery model can be updated according to temperature changes.

[0050] It should be noted that the fitting formula of the dynamic recovery model is as follows:

[0051] Wherein, 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 (the maximum value of the received excitation voltage change), tends to 0 as time increases; is the constant of the recovery time, which is determined by the carrier recombination characteristics and is measured to be 7.2 - 8.5 ms, and can preferably be 8 ms; 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 conform to the above fitting formula, it is determined that the actual ultraviolet detection signal has not recovered.

[0052] Furthermore, in some embodiments of the present invention, compensating the actual ultraviolet detection signal according to the drift compensation value includes: obtaining the difference between the actual ultraviolet detection signal and the drift compensation value, and using the difference as the compensated actual ultraviolet detection signal.

[0053] 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 4.0 mV and the drift compensation value ΔU_drift is equal to 1.10 mV, then the compensated actual ultraviolet detection signal U_true = U_clean - ΔU_drift = 4.0 mV - 1.10 mV = 2.90 mV.

[0054] Further, in some embodiments of the present invention, the ultraviolet partial discharge detection method further 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 non-partial discharge state, and controlling the gallium nitride ultraviolet sensor to enter a low-power mode.

[0055] Specifically, in this embodiment, the preset slope threshold can preferably be 30V / μs, and the preset slope threshold is determined based on the analysis of a large amount of experimental data and in-depth research on the characteristics of partial discharge signals. 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 occurs 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 detects that the slope corresponding to the actual ultraviolet detection signal exceeds the preset slope threshold again, it can quickly restore the sensor from the low-power mode to the normal working state to ensure that no potential partial discharge event is 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.

[0056] In summary, according to the ultraviolet partial discharge detection method of the embodiments of the present invention, by obtaining the initial ultraviolet detection signal and the environmental parameter detection signal, and respectively preprocessing the initial ultraviolet detection signal and the environmental parameter detection signal to obtain the actual ultraviolet detection signal and the 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, compensating the actual ultraviolet detection signal according to the drift compensation value, and obtaining the true ultraviolet partial discharge intensity corresponding to the ultraviolet detection signal according to the compensated actual ultraviolet detection signal. Thus, the detection accuracy and stability of the ultraviolet signal can be improved, the deviation of the detection result caused by environmental factor interference can be avoided, and the occurrence frequency of false alarms can be significantly reduced.

[0057] Based on the ultraviolet partial discharge detection method proposed in the foregoing embodiments of the present invention, embodiments of the present invention also propose 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 foregoing embodiments of the present invention is implemented.

[0058] According to the computer-readable storage medium of the embodiments of the present invention, by executing the ultraviolet partial discharge detection program by a processor, the detection accuracy and stability of the ultraviolet signal can be improved, the deviation of the detection result caused by environmental factor interference can be avoided, and the occurrence frequency of false alarms can be significantly reduced.

[0059] Figure 3It is a schematic structural diagram of the ultraviolet partial discharge detection device according to an embodiment of the present invention.

[0060] Specifically, the ultraviolet partial discharge detection device is applied to a gallium nitride ultraviolet sensor and executes the ultraviolet partial discharge detection method of the above embodiment of the present invention. As Figure 3 shown, the ultraviolet partial discharge detection device 100 includes an acquisition module 10, a compensation module 20, and a processing module 30.

[0061] Among them, the acquisition module 10 is used 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; 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 true partial discharge state based on the actual ultraviolet detection signal; the processing module 30 is used to obtain the true ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal according to the compensated actual ultraviolet detection signal.

[0062] In some embodiments of the present invention, the acquisition module 10 is specifically used to perform high-pass filtering and adaptive notch filtering on the initial ultraviolet detection signal to obtain the actual ultraviolet detection signal.

[0063] 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 used to obtain a temperature offset value and a humidity offset value according to the temperature detection signal and the humidity detection signal through the following formula:

[0064]

[0065] Among them, represents the temperature offset value, represents the temperature offset coefficient, represents the current temperature, represents the reference temperature, represents the humidity offset value, represents the humidity offset coefficient, represents the current humidity, represents the reference humidity; the sum value of the temperature offset value and the humidity offset value is used as the drift compensation value.

[0066] In some embodiments of the present invention, the acquisition module 10 is further used to obtain the 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 true partial discharge state when the slope corresponding to the actual ultraviolet detection signal is greater than a preset slope threshold and it is determined that the actual ultraviolet detection signal has not recovered according to the dynamic recovery model. The fitting formula of the dynamic recovery model is as follows:

[0067] Among them, 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 the recovery time; is the 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.

[0068] In some embodiments of the present invention, the compensation module 20 is specifically configured to obtain the difference between the actual ultraviolet detection signal and the drift compensation value, and use the difference as the compensated actual ultraviolet detection signal.

[0069] In some embodiments of the present invention, the true ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal is obtained through the following formula: U = K1×U_true + K2×Uk, where U is the true ultraviolet partial discharge intensity, U_true is the amplitude of the compensated actual ultraviolet detection signal, Uk is the slope of the compensated actual ultraviolet detection signal, and K1 and K2 are constant coefficients.

[0070] In some embodiments of the present invention, the processing module 30 is further configured to determine that the gallium nitride ultraviolet sensor is in a non-partial discharge state 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 mode.

[0071] It should be noted that for other specific embodiments of the ultraviolet partial discharge detection device proposed in the embodiments of the present invention, reference may be made to the specific embodiments of the ultraviolet partial discharge detection method in the foregoing embodiments of the present invention. To reduce redundancy, they will not be elaborated here.

[0072] According to the ultraviolet partial discharge detection device of the embodiments of the present invention, the initial ultraviolet detection signal and the environmental parameter detection signal are obtained through the acquisition module, and the initial ultraviolet detection signal and the environmental parameter detection signal are respectively preprocessed to obtain the actual ultraviolet detection signal and the drift compensation value, and when it is determined that the gallium nitride ultraviolet sensor is in a true partial discharge state according to the actual ultraviolet detection signal through the compensation module, the actual ultraviolet detection signal is compensated according to the drift compensation value, and the true ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal is obtained through the processing module according to the compensated actual ultraviolet detection signal. Thus, the detection accuracy and stability of the ultraviolet signal can be improved, the deviation of the detection result caused by environmental factor interference can be avoided, and the occurrence frequency of false alarms can be significantly reduced.

[0073] Figure 4It is a schematic structural diagram of the ultraviolet sensor according to an embodiment of the present invention.

[0074] As Figure 4 shown, the ultraviolet sensor 1000 includes the ultraviolet partial discharge detection device 100 of the above embodiment of the present invention.

[0075] According to the ultraviolet sensor of the embodiment of the present invention, by adopting the ultraviolet partial discharge detection device of the above embodiment of the present invention, the detection accuracy and stability of the ultraviolet signal can be improved, and the deviation of the detection result caused by environmental factor interference can be avoided, and the occurrence frequency of false alarms is significantly reduced.

[0076] It should be noted that the logic and / or steps represented in the flowchart or described in other ways herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus or device), or used in combination with these instruction execution systems, apparatus or devices. For the 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 connection with an instruction execution system, apparatus or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or otherwise processing as appropriate, and then stored in a computer memory.

[0077] It should be understood that each part of the present invention can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiment, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following well-known technologies in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0078] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0079] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the 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 thus should not be construed as a limitation to the present invention.

[0080] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0081] In the present invention, unless otherwise clearly specified and limited, the terms such as "mounted", "connected", "connected to", "fixed" etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0082] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Further, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher level height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower level height than the second feature.

[0083] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An ultraviolet partial discharge detection method, characterized in that, The method is applied to a gallium nitride ultraviolet sensor, and the method includes: Obtain 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; When it is determined that the gallium nitride ultraviolet sensor is in a true partial discharge state according to the actual ultraviolet detection signal, compensate the actual ultraviolet detection signal according to the drift compensation value; Obtain the true ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal according to the compensated actual ultraviolet detection signal.

2. The ultraviolet partial discharge detection method according to claim 1, wherein Preprocessing the initial ultraviolet detection signal includes: Perform high-pass filtering and adaptive notch filtering on the initial ultraviolet detection signal 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. Preprocessing the environmental parameter detection signal includes: According to the temperature detection signal and the humidity detection signal, obtain a temperature offset value and a humidity offset value through the following formula: Among them, represents the temperature offset value, represents the temperature offset coefficient, represents the current temperature, represents the reference temperature, represents the humidity offset value, represents the humidity offset coefficient, represents the current humidity, represents the reference humidity; Use the sum value of the temperature offset value and the humidity offset value as the drift compensation value.

4. The ultraviolet partial discharge detection method according to claim 2, wherein The method further includes: Obtain 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 that the actual ultraviolet detection signal has not recovered according to the dynamic recovery model, determine that the gallium nitride ultraviolet sensor is in a true partial discharge state, where the fitting formula of the dynamic recovery model is as follows: wherein, 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; is the constant of the recovery time; is the steady-state baseline voltage. When the output voltage corresponding to the actual UV detection signal does not conform to the above fitting formula, it is determined that the actual UV detection signal has not recovered.

5. The ultraviolet partial discharge detection method according to claim 4, characterized in that The compensating the actual ultraviolet detection signal according to the drift compensation value includes: Obtain the difference between the actual ultraviolet detection signal and the drift compensation value, and use the difference as the compensated actual ultraviolet detection signal.

6. The ultraviolet partial discharge detection method according to claim 5, wherein Obtain the true ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal through the following formula: U = K1×U_true + K2×Uk, where U is the true ultraviolet partial discharge intensity, U_true is the amplitude of the compensated actual ultraviolet detection signal, Uk is the slope of the compensated actual ultraviolet detection signal, and K1, K2 are constant coefficients.

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

8. A computer-readable storage medium, characterized in that, A ultraviolet partial discharge detection program is stored thereon, and when the ultraviolet partial discharge detection program is executed by a processor, the ultraviolet partial discharge detection method according to any one of claims 1-7 is implemented.

9. An ultraviolet partial discharge detection device, characterized in that, The device is applied to a gallium nitride ultraviolet sensor and executes the ultraviolet partial discharge detection method according to any one of claims 1-7. The device includes: 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 true partial discharge state according to the actual ultraviolet detection signal; A processing module, configured to obtain the true ultraviolet partial discharge intensity corresponding to the initial ultraviolet detection signal according to the compensated actual ultraviolet detection signal.

10. An ultraviolet sensor, characterized in that, Comprising the ultraviolet partial discharge detection device according to claim 9.

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