Direct current channeling monitoring and early warning method, device and equipment and storage medium

Abstract

The invention provides a direct-current electricity channeling monitoring and early warning method, device and equipment and a storage medium, and the method comprises the steps: obtaining the bus voltage, the positive voltage to ground and the negative voltage to ground of each section of bus in a direct-current system; acquiring a bus voltage difference based on the bus voltage; acquiring a positive voltage-to-ground difference based on the positive voltage-to-ground, and acquiring a negative voltage-to-ground difference based on the negative voltage-to-ground; and determining that the bus voltage difference is greater than a preset bus voltage difference threshold value, and carrying out channeling monitoring and early warning based on the positive electrode voltage-to-ground difference and the negative electrode voltage-to-ground difference. According to the technical scheme of the invention, accurate monitoring of the electric channeling fault of the direct current system can be realized.

Description

Technical Field

[0001] The present application relates to the field of electrical engineering technology, and in particular to a method, device, equipment and storage medium for monitoring and warning of DC current leakage. Background Art

[0002] Related technologies typically rely on regular manual inspections to monitor DC system power leakage faults. This approach can result in delayed detection of hidden dangers and high labor costs. Summary of the Invention

[0003] The present application aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] In the first aspect, the present application proposes a DC current leakage monitoring and early warning method, which includes: obtaining the bus voltage, positive pole-to-ground voltage and negative pole-to-ground voltage of each bus section in the DC system; obtaining the bus voltage difference based on the bus voltage; obtaining the positive pole-to-ground voltage difference based on the positive pole-to-ground voltage, and obtaining the negative pole-to-ground voltage difference based on the negative pole-to-ground voltage; determining that the bus voltage difference is greater than a preset bus voltage difference threshold, and performing current leakage monitoring and early warning based on the positive pole-to-ground voltage difference and the negative pole-to-ground voltage difference.

[0005] In one implementation, the electrical crosstalk monitoring and early warning based on the positive pole-to-ground voltage difference and the negative pole-to-ground voltage difference includes: determining that the positive pole-to-ground voltage difference is within a first threshold range, and obtaining a historical negative pole-to-ground voltage difference; obtaining an average of the negative pole-to-ground voltage difference based on the historical negative pole-to-ground voltage difference and the negative pole-to-ground voltage difference; and performing electrical crosstalk monitoring based on the average of the negative pole-to-ground voltage difference and at least one preset negative pole-to-ground voltage difference threshold range.

[0006] In an optional implementation, the method further includes: obtaining a historical average of the negative pole-to-ground voltage difference; obtaining a negative pole-to-ground voltage difference slowdown value based on the average of the negative pole-to-ground voltage difference and the average of the negative pole-to-ground voltage difference; obtaining a first predicted duration for the negative pole-to-ground voltage difference slowdown value to reach the negative pole-to-ground voltage difference threshold range based on the negative pole-to-ground voltage difference slowdown value and the average of the negative pole-to-ground voltage difference; and providing a power leakage warning based on the first predicted duration.

[0007] In one implementation, the electric leakage monitoring and early warning based on the positive pole-to-ground voltage difference and the negative pole-to-ground voltage difference includes: determining that the negative pole-to-ground voltage difference is within a second threshold range, and obtaining a historical positive pole-to-ground voltage difference; obtaining an average positive pole-to-ground voltage difference based on the historical positive pole-to-ground voltage difference and the positive pole-to-ground voltage difference; and performing electric leakage early warning monitoring based on the average positive pole-to-ground voltage difference and at least one preset positive pole-to-ground voltage difference threshold range.

[0008] In one implementation, the method further includes obtaining a historical average of the positive-pole-to-ground voltage difference; obtaining a positive-pole-to-ground voltage difference slowdown value based on the average of the positive-pole-to-ground voltage difference and the average of the positive-pole-to-ground voltage difference; obtaining a first predicted duration for the predicted positive-pole-to-ground voltage difference slowdown value to reach the positive-pole-to-ground voltage difference threshold range based on the positive-pole-to-ground voltage difference slowdown value and the average of the positive-pole-to-ground voltage difference; and providing a current leakage warning based on the first predicted duration.

[0009] In one implementation, the method further includes: determining that the bus voltage difference is greater than a preset threshold, and switching the equalizing state.

[0010] In the second aspect, the present application proposes a DC current leakage monitoring and early warning device, which includes: an acquisition module for obtaining the bus voltage, positive pole-to-ground voltage and negative pole-to-ground voltage of each bus section in the DC system; a first processing module for obtaining the bus voltage difference based on the bus voltage; a second processing module for obtaining the positive pole-to-ground voltage difference based on the positive pole-to-ground voltage, and obtaining the negative pole-to-ground voltage difference based on the negative pole-to-ground voltage; a third processing module for determining that the bus voltage difference is greater than a preset bus voltage difference threshold, and performing current leakage monitoring and early warning based on the positive pole-to-ground voltage difference and the negative pole-to-ground voltage difference.

[0011] In one implementation, the third processing module is used to: determine that the positive pole-to-ground voltage difference is within a first threshold range, and obtain a historical negative pole-to-ground voltage difference; based on the historical negative pole-to-ground voltage difference and the negative pole-to-ground voltage difference, obtain an average of the negative pole-to-ground voltage difference; and perform current leakage monitoring based on the average of the negative pole-to-ground voltage difference and at least one preset negative pole-to-ground voltage difference threshold range.

[0012] In an optional implementation, the device also includes a fourth processing module, which is used to: obtain the historical average value of the negative pole-to-ground voltage difference; obtain the negative pole-to-ground voltage difference slowdown value based on the average value of the negative pole-to-ground voltage difference and the average value of the negative pole-to-ground voltage difference; obtain the first predicted time length for the negative pole-to-ground voltage difference slowdown value to reach the negative pole-to-ground voltage difference threshold range based on the negative pole-to-ground voltage difference slowdown value and the average value of the negative pole-to-ground voltage difference; and issue a power leakage warning based on the first predicted time length.

[0013] In one implementation, the third processing module is used to: determine that the negative pole-to-ground voltage difference is within a second threshold range, and obtain a historical positive pole-to-ground voltage difference; obtain an average of the positive pole-to-ground voltage difference based on the historical positive pole-to-ground voltage difference and the positive pole-to-ground voltage difference; and perform electric leakage warning monitoring based on the average of the positive pole-to-ground voltage difference and at least one preset positive pole-to-ground voltage difference threshold range.

[0014] In one implementation, the device also includes a fifth processing module, which is used to: obtain the historical average value of the positive pole-to-ground voltage difference; obtain the positive pole-to-ground voltage difference slowdown value based on the average value of the positive pole-to-ground voltage difference and the average value of the positive pole-to-ground voltage difference; obtain the first predicted time length for the predicted positive pole-to-ground voltage difference slowdown value to reach the positive pole-to-ground voltage difference threshold range based on the positive pole-to-ground voltage difference slowdown value and the average value of the positive pole-to-ground voltage difference; and perform a power leakage warning based on the first predicted time length.

[0015] In one implementation, the device further includes a sixth processing module, configured to: determine that the bus voltage difference is greater than a preset threshold, and perform a surge balancing state switch.

[0016] In the third aspect, the present application proposes an electronic device comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the DC current leakage monitoring and early warning method as described in the first aspect.

[0017] In a fourth aspect, the present application proposes a computer-readable storage medium for storing instructions, which, when executed, enables the method described in the first aspect to be implemented.

[0018] In a fifth aspect, the present application proposes a computer program product, comprising a computer program, which, when executed by a processor, implements the steps of the DC current leakage monitoring and early warning method as described in the first aspect.

[0019] The DC current leakage monitoring and early warning method, device, equipment, and storage medium provided herein can obtain bus voltage differences and ground voltage differences based on the bus voltages and ground voltages of different buses in a DC system. When the bus voltage differences meet preset conditions, current leakage monitoring and early warning are performed based on the positive and negative pole-to-ground voltage differences. This enables precise monitoring of DC system current leakage faults.

[0020] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0022] Figure 1 This is a flow chart of a DC current leakage monitoring and early warning method provided in an embodiment of the present application;

[0023] Figure 2This is a flow chart of another DC current leakage monitoring and early warning method provided in an embodiment of the present application;

[0024] Figure 3 This is a flow chart of another DC current leakage monitoring and early warning method provided in an embodiment of the present application;

[0025] Figure 4 Schematic diagram of a DC current leakage monitoring and early warning solution provided in an embodiment of the present application;

[0026] Figure 5 This is a data flow diagram of a DC current leakage monitoring and early warning solution provided by an embodiment of the present application;

[0027] Figure 6 This is a structural diagram of a DC current leakage monitoring and early warning device provided in an embodiment of the present application;

[0028] Figure 7 This is a structural diagram of another DC current leakage monitoring and early warning device provided in an embodiment of the present application;

[0029] Figure 8 This is a structural diagram of another DC current leakage monitoring and early warning device provided in an embodiment of the present application;

[0030] Figure 9 This is a structural diagram of another DC current leakage monitoring and early warning device provided in an embodiment of the present application;

[0031] Figure 10 It is a structural diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] The following describes in detail embodiments of the present application, 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 application, and should not be construed as limiting the present application.

[0033] The following describes the DC current leakage monitoring and early warning method and device according to the embodiments of the present application with reference to the accompanying drawings.

[0034] Figure 1 This is a flow chart of a DC current leakage monitoring and early warning method provided by the embodiment of the present application. Figure 1 As shown, the method may include but is not limited to the following steps:

[0035] Step S101: Obtain the bus voltage, positive pole-to-ground voltage, and negative pole-to-ground voltage of each bus segment in the DC system.

[0036] It should be noted that, in the embodiment of the present application, the DC system includes multiple busbar sections.

[0037] It should be noted that in the embodiments of the present application, the above-mentioned bus voltage, positive electrode to ground voltage, and negative electrode to ground voltage may be the detected values at the current moment.

[0038] Exemplarily, the bus voltage, the positive electrode to ground voltage of the bus, and the negative electrode to ground voltage of the bus in each section of the DC system are respectively obtained through the feeder cabinet detector of the DC power supply system.

[0039] Step S102: Obtain the bus voltage difference based on the bus voltage.

[0040] It should be noted that in the embodiments of the present application, for the convenience of subsequent calculation and processing, the above-mentioned bus voltage difference may be the absolute value of the bus voltage difference value.

[0041] Exemplarily, taking the DC system including two sections of buses as an example, the calculation process of the bus voltage difference can be expressed as:

[0042] 丨△U丨=|U1 - U2|

[0043] Where, △U is the bus voltage difference, and U1 and U2 are the bus voltages of different sections of the bus respectively.

[0044] Step S103: Obtain the positive electrode to ground voltage difference based on the positive electrode to ground voltage, and obtain the negative electrode to ground voltage difference based on the negative electrode to ground voltage.

[0045] It should be noted that in the embodiments of the present application, for the convenience of subsequent calculation and processing, the above-mentioned positive electrode to ground voltage difference may be the absolute value of the positive electrode to ground voltage difference value, and the above-mentioned negative electrode to ground voltage difference may be the absolute value of the negative electrode to ground voltage difference value.

[0046] Exemplarily, taking the DC system including two sections of buses as an example, the calculation process of the voltage difference to ground can be expressed as follows:

[0047] The positive electrode to ground voltage difference can be expressed as:

[0048] 丨△U+丨=|U1+ - U2+|

[0049] Where, △U+ is the positive electrode to ground voltage difference, and U1+ and U2+ are the positive electrode to ground voltages of different sections of the bus.

[0050] The negative electrode to ground voltage difference can be expressed as:

[0051] 丨△U-丨=|U1- - U2-|

[0052] Where, △U- is the positive electrode to ground voltage difference, and U1- and U2- are the positive electrode to ground voltages of different sections of the bus.

[0053] Step S104: Determine that the bus voltage difference is greater than a preset bus voltage difference threshold, and perform a current leakage monitoring and early warning based on the positive electrode-to-ground voltage difference and the negative electrode-to-ground voltage difference.

[0054] It should be noted that during normal operation, the voltage between the positive and negative poles of the two-section DC system is approximately ±110V relative to ground, and the voltage between the positive and negative poles is approximately 220V. Both DC systems are under floating charge, and the bus voltage deviation is small. If there is current leakage between the positive or negative poles of the two-section DC system, the voltage between the positive and negative poles of one section relative to ground may change synchronously with the voltage between the positive and negative poles of the other section.

[0055] As an example, it is determined that the bus voltage difference is greater than a preset bus voltage difference threshold, and the positive pole-to-ground voltage difference is within a preset range, and the sliding average value corresponding to the negative pole-to-ground voltage difference is obtained. If the sliding average value is greater than the preset threshold, it is determined that a negative pole-to-ground current leakage fault has occurred in the DC system.

[0056] As an example, it is determined that the bus voltage difference is greater than a preset bus voltage difference threshold, and the negative pole-to-ground voltage difference is within a preset range, and the sliding average corresponding to the positive pole-to-ground voltage difference is obtained. If the sliding average is greater than the preset threshold, it is determined that a positive pole-to-ground current leakage fault has occurred in the DC system.

[0057] As an example, it is determined that the bus voltage difference is greater than a preset bus voltage difference threshold, the rate of change of the positive pole-to-ground voltage difference is obtained, and the positive pole-to-ground voltage difference at a future moment is predicted based on the rate of change. If it is predicted that the positive pole-to-ground voltage difference at a future moment will reach the alarm threshold within a preset time period, a positive pole-to-ground current leakage warning of the DC system is issued.

[0058] As an example, it is determined that the bus voltage difference is greater than a preset bus voltage difference threshold, the rate of change of the negative pole-to-ground voltage difference is obtained, and the negative pole-to-ground voltage difference at a future moment is predicted based on the rate of change. If it is predicted that the negative pole-to-ground voltage difference at a future moment will reach the alarm threshold within a preset time period, a negative pole-to-ground current leakage warning of the DC system is issued.

[0059] In some embodiments, the first positive pole-to-ground voltage difference and the first negative pole-to-ground voltage difference when a positive pole current leakage fault occurs in the DC system, as well as the second positive pole-to-ground voltage difference and the second negative pole-to-ground voltage difference when a positive pole current leakage fault occurs in the DC system can be obtained respectively. A classifier is obtained through training with the above data, and current leakage monitoring and early warning are performed based on the trained classifier combined with the positive pole-to-ground voltage difference and the negative pole-to-ground voltage difference at the current moment.

[0060] In some embodiments, time series data of voltage changes and other related data (e.g., current, temperature, humidity, etc.) can be collected. The above data is normalized and feature extracted to obtain data features (e.g., numerical features, statistical features, time domain features, and frequency domain features). The extracted feature data is used to train the neural network model, and the hyperparameters are adjusted to optimize the performance to obtain a trained neural network model. The current bus voltage, positive pole-to-ground voltage, and negative pole-to-ground voltage are then input into the trained neural network model for current crosstalk monitoring.

[0061] By implementing the embodiments of the present application, the bus voltage difference and the ground voltage difference can be obtained based on the bus voltages and ground voltages of different buses in a DC system. When the bus voltage difference meets a preset condition, a positive-pole-ground voltage difference and a negative-pole-ground voltage difference can be used to monitor and warn of electrical crosstalk. This enables accurate monitoring of DC system electrical crosstalk faults.

[0062] In one implementation, when the bus voltage difference and the positive-to-ground voltage difference meet the conditions, the negative-to-ground voltage difference can be used to monitor the negative-to-ground current leakage. Figure 2 , Figure 2 This is a flow chart of another DC current leakage monitoring and early warning method provided by the embodiment of the present application. Figure 2 As shown, the method may include but is not limited to the following steps:

[0063] Step S201: Obtain the bus voltage, positive pole-to-ground voltage, and negative pole-to-ground voltage of each bus segment in the DC system.

[0064] In the embodiment of the present application, step S201 can be implemented by any of the methods in the embodiments of the present application. The embodiments of the present application do not limit this and will not be described in detail.

[0065] Step S202: Obtaining a bus voltage difference based on the bus voltage.

[0066] In the embodiment of the present application, step S202 can be implemented by any of the methods in the embodiments of the present application. The embodiments of the present application do not limit this and will not be described in detail.

[0067] Step S203: obtaining the positive electrode-to-ground voltage difference based on the positive electrode-to-ground voltage, and obtaining the negative electrode-to-ground voltage difference based on the negative electrode-to-ground voltage.

[0068] In the embodiment of the present application, step S203 can be implemented by any of the methods in the embodiments of the present application. The embodiments of the present application do not limit this and will not be described in detail.

[0069] Step S204: determining that the bus voltage difference is greater than a preset bus voltage difference threshold, and the positive electrode-to-ground voltage difference is within a first threshold range, and obtaining a historical negative electrode-to-ground voltage difference.

[0070] Exemplarily, it is determined that the bus voltage difference is greater than a preset bus voltage difference threshold, and the positive electrode-to-ground voltage difference is within a first threshold range, and a historical negative electrode-to-ground voltage difference within a preset historical time period is obtained.

[0071] Step S205: Based on the historical negative electrode-to-ground voltage differences and the negative electrode-to-ground voltage differences, an average negative electrode-to-ground voltage difference is obtained.

[0072] Exemplarily, the average of the historical negative electrode-to-ground voltage difference and the negative electrode-to-ground voltage difference is calculated to obtain the average of the negative electrode-to-ground voltage difference in the historical period with the current moment as the end moment.

[0073] Step S206: Performing current leakage monitoring based on the average value of the negative electrode-to-ground voltage difference and at least one preset negative electrode-to-ground voltage difference threshold range.

[0074] Exemplarily, the above-mentioned negative pole-to-ground voltage difference threshold range may include three ranges: (2.5-10), (1.5-2.5) and (0-1.5). If the average value of the negative pole-to-ground voltage difference is within the range of (2.5-10), the risk of a negative pole-to-ground current leakage fault in the DC system is determined to be low risk; if the average value of the negative pole-to-ground voltage difference is within the range of (1.5-2.5), the risk of a negative pole-to-ground current leakage fault in the DC system is determined to be low risk; if the average value of the negative pole-to-ground voltage difference is within the range of (0-1.5), the risk of a negative pole-to-ground current leakage fault in the DC system is determined to be medium risk; if the average value of the negative pole-to-ground voltage difference is within the range of (0-1.5), the risk of a negative pole-to-ground current leakage fault in the DC system is determined to be high risk.

[0075] By implementing the embodiments of the present application, when the bus voltage difference and the positive-pole-to-ground voltage difference meet corresponding conditions, the negative-pole-to-ground voltage average can be obtained based on the negative-pole-to-ground voltage and historical negative-pole-to-ground voltages. This allows for negative-pole crosstalk monitoring of the DC system based on the relationship between the historical negative-pole-to-ground voltage average and the negative-pole-to-ground voltage difference threshold range. This enables accurate monitoring of negative-pole crosstalk faults in the DC system.

[0076] In some embodiments, the above method may further include the following steps:

[0077] Step A1: Obtain the historical average value of the negative electrode-to-ground voltage difference.

[0078] Exemplarily, the average value of the historical negative electrode-to-ground voltage difference within a preset historical time period is obtained.

[0079] Step A2: Based on the historical average of the negative electrode-to-ground voltage difference and the average of the negative electrode-to-ground voltage difference, obtain the negative electrode-to-ground voltage difference slow variable.

[0080] Exemplarily, the lower limit of the negative pole-to-ground voltage difference threshold is obtained, and the difference between each historical negative pole-to-ground voltage difference average and the current negative pole-to-ground voltage difference average is obtained, and the above-mentioned slow variable is obtained according to the numerical change relationship between the above-mentioned multiple differences.

[0081] For example, based on the historical average negative-pole-to-ground voltage difference and the current average negative-pole-to-ground voltage difference, the rate of change corresponding to the current average negative-pole-to-ground voltage difference is obtained, and the average difference between the corresponding average ground voltage differences at two adjacent sampling times is obtained as the slow variable. The sampling time is the sampling time for obtaining the bus voltage, the positive-pole-to-ground voltage, and the negative-pole-to-ground voltage.

[0082] Step A3: Based on the negative electrode-to-ground voltage difference ramp rate and the negative electrode-to-ground voltage difference average, obtain a first predicted time duration for the negative electrode-to-ground voltage difference average to reach a negative electrode-to-ground voltage difference threshold range.

[0083] For example, the difference between the lower limit of the negative-pole-to-ground voltage difference threshold and the current negative-pole-to-ground voltage difference is obtained, the difference is divided by the negative-pole-to-ground voltage difference slow variable to obtain a first coefficient, and the first coefficient is multiplied by a sampling duration to obtain a first prediction duration. The sampling duration is the duration of a sampling interval for obtaining the bus voltage, the positive-pole-to-ground voltage, and the negative-pole-to-ground voltage.

[0084] Step A4: Provide a power leakage warning based on the first predicted duration.

[0085] Exemplarily, if the first predicted duration is greater than or equal to the preset first duration threshold and less than the preset second duration threshold, a power leakage warning message is generated; if the first predicted duration is greater than or equal to the second duration threshold, no warning message is generated.

[0086] By implementing the embodiments of the present application, the slowdown value of the mean value of the negative-pole-to-ground voltage difference can be obtained, so as to perform degradation prediction based on the slowdown value of the negative-pole-to-ground voltage difference, thereby realizing DC system current leakage warning.

[0087] In some embodiments, when the bus voltage difference and the negative electrode to ground voltage difference meet the conditions, the positive electrode to ground current leakage monitoring can be performed based on the positive electrode to ground voltage difference. As an example, see Figure 3 , Figure 3 This is a flow chart of another DC current leakage monitoring and early warning method provided by the embodiment of the present application. Figure 3 As shown, the method may include but is not limited to the following steps:

[0088] Step S301: Obtain the bus voltage, positive pole-to-ground voltage, and negative pole-to-ground voltage of each bus segment in the DC system.

[0089] In the embodiment of the present application, step S301 can be implemented in any of the ways in the embodiments of the present application. The embodiments of the present application do not limit this and will not be described in detail.

[0090] Step S302: Obtain the bus voltage difference based on the bus voltage.

[0091] In the embodiment of the present application, step S302 can be implemented by any of the methods in the embodiments of the present application. The embodiments of the present application do not limit this and will not be described in detail.

[0092] Step S303: obtaining the positive electrode-to-ground voltage difference based on the positive electrode-to-ground voltage, and obtaining the negative electrode-to-ground voltage difference based on the negative electrode-to-ground voltage.

[0093] In the embodiment of the present application, step S303 can be implemented by any of the methods in the embodiments of the present application. The embodiments of the present application do not limit this and will not be described in detail.

[0094] Step S304: determining that the bus voltage difference is greater than a preset bus voltage difference threshold, and the negative electrode-to-ground voltage difference is within a second threshold range, and obtaining a historical positive electrode-to-ground voltage difference.

[0095] Exemplarily, it is determined that the bus voltage difference is greater than a preset bus voltage difference threshold, and the negative electrode-to-ground voltage difference is within a second threshold range, and a historical positive electrode-to-ground voltage difference within a preset historical time period is obtained.

[0096] Step S305: Based on the historical positive electrode-to-ground voltage difference and the positive electrode-to-ground voltage difference, obtain the average positive electrode-to-ground voltage difference.

[0097] Exemplarily, the average of the historical positive electrode-to-ground voltage difference and the positive electrode-to-ground voltage difference is calculated to obtain the average of the positive electrode-to-ground voltage difference in the historical period with the current moment as the end moment.

[0098] Step S306: Performing current leakage monitoring based on the average positive electrode-to-ground voltage difference value and at least one preset positive electrode-to-ground voltage difference threshold range.

[0099] Exemplarily, the above-mentioned positive pole-to-ground voltage difference threshold range may include three ranges: (2.5V~10V), (1.5V~2.5V) and (0V~1.5V). If the average value of the positive pole-to-ground voltage difference is within the range of (2.5V~10V), the risk of a positive pole-to-ground current leakage fault in the DC system is determined to be low risk; if the average value of the positive pole-to-ground voltage difference is within the range of (1.5V~2.5V), the risk of a positive pole-to-ground current leakage fault in the DC system is determined to be low risk; if the average value of the positive pole-to-ground voltage difference is within the range of (0V~1.5V), the risk of a positive pole-to-ground current leakage fault in the DC system is determined to be medium risk; if the average value of the positive pole-to-ground voltage difference is within the range of (0V~1.5V), the risk of a positive pole-to-ground current leakage fault in the DC system is determined to be high risk.

[0100] By implementing the embodiments of the present application, when the bus voltage difference and the negative-pole-to-ground voltage difference meet corresponding conditions, the average positive-pole-to-ground voltage can be obtained based on the positive-pole-to-ground voltage and historical positive-pole-to-ground voltages. This allows for monitoring of DC system positive-pole crosstalk based on the relationship between the historical average positive-pole-to-ground voltage and the positive-pole-to-ground voltage difference threshold range. This enables accurate monitoring of DC system positive-pole crosstalk faults.

[0101] In some embodiments, the above method may further include the following steps:

[0102] Step B1: Obtain the historical average value of the positive electrode-to-ground voltage difference.

[0103] Exemplarily, the average value of the historical negative electrode-to-ground voltage difference within a preset historical time period is obtained.

[0104] Step B2: Based on the average value of the positive electrode-to-ground voltage difference and the average value of the positive electrode-to-ground voltage difference, obtain the positive electrode-to-ground voltage difference slowdown variable.

[0105] Exemplarily, the lower limit of the positive-to-ground voltage difference threshold is obtained, and the difference between each historical positive-to-ground voltage difference average and the current positive-to-ground voltage difference average is obtained, and the above-mentioned slow variable is obtained according to the numerical change relationship between the above-mentioned multiple differences.

[0106] For example, based on the historical average positive-to-ground voltage difference and the current average positive-to-ground voltage difference, the rate of change corresponding to the current average positive-to-ground voltage difference is obtained, and the average difference between the corresponding average positive-to-ground voltage differences at two adjacent sampling times is obtained as the slow variable. The sampling time is the sampling time for obtaining the bus voltage, the positive-to-ground voltage, and the positive-to-ground voltage.

[0107] Step B3: Based on the positive electrode-to-ground voltage difference ramp rate and the positive electrode-to-ground voltage difference average, obtain a second predicted time duration for the predicted positive electrode-to-ground voltage difference average to reach a positive electrode-to-ground voltage difference threshold range.

[0108] Exemplarily, the difference between the lower limit of the positive-to-ground voltage difference threshold range and the current positive-to-ground voltage difference is obtained, the difference is divided by the positive-to-ground voltage difference slow variable to obtain a second coefficient, and the second coefficient is multiplied by the sampling duration to obtain the second prediction duration. The sampling duration is the duration of the sampling interval for obtaining the bus voltage, the positive-to-ground voltage, and the negative-to-ground voltage.

[0109] Step B4: Provide a power leakage warning based on the second predicted duration.

[0110] Exemplarily, if the second predicted duration is greater than or equal to the preset second duration threshold and less than the preset third duration threshold, a power leakage warning message is generated; if the second predicted duration is greater than or equal to the third duration threshold, no warning message is generated.

[0111] By implementing the embodiments of the present application, the slowdown value of the average value of the positive-to-ground voltage difference can be obtained, so as to perform degradation prediction based on the slowdown value of the positive-to-ground voltage difference, thereby realizing DC system current leakage warning.

[0112] In one implementation, the method further includes: determining that the bus voltage difference is greater than a preset threshold, and switching the equalizing state.

[0113] Exemplarily, if it is determined that the bus voltage difference at the current moment is greater than a preset threshold (eg, 7V), the DC system is switched from floating charge to equalized charge.

[0114] See Figure 4 , Figure 4 This is a schematic diagram of a DC current leakage monitoring and early warning solution provided by an embodiment of the present application. Figure 4 As shown, the positive and negative pole-to-ground voltages (i.e., the aforementioned U1+, U1-, U2+, and U2-) and bus voltages (i.e., the aforementioned U1 and U2) of the two-section DC system can be collected, and the bus voltage difference, the positive pole-to-ground voltage difference, and the negative pole-to-ground voltage difference can be calculated using a range model. When the bus voltage difference meets the preset conditions, a three-dimensional coordinate system is established to analyze the characteristic values ​​of the positive pole-to-ground voltage difference and the negative pole-to-ground voltage (e.g., the deviation value and the slowdown variable from the corresponding threshold value), so as to perform graded alarms based on the characteristic values, and predict the degradation trend in combination with historical data to achieve early warning.

[0115] In some embodiments, the DC crosstalk monitoring and early warning method provided in any embodiment of the present application can be implemented based on the Industrial Internet. As an example, see Figure 5 , Figure 5 This is a data flow diagram of a DC current leakage monitoring and early warning solution provided in an embodiment of the present application.

[0116] See Figure 6 , Figure 6 This is a schematic diagram of the structure of a DC current leakage monitoring and early warning device provided in an embodiment of the present application. Figure 6 As shown, the device 600 includes: an acquisition module 601, which is used to obtain the bus voltage, positive pole-to-ground voltage and negative pole-to-ground voltage of each bus section in the DC system; a first processing module 602, which is used to obtain the bus voltage difference based on the bus voltage; a second processing module 603, which is used to obtain the positive pole-to-ground voltage difference based on the positive pole-to-ground voltage, and to obtain the negative pole-to-ground voltage difference based on the negative pole-to-ground voltage; a third processing module 604, which is used to determine that the bus voltage difference is greater than a preset bus voltage difference threshold, and to perform current leakage monitoring and early warning based on the positive pole-to-ground voltage difference and the negative pole-to-ground voltage difference.

[0117] In one implementation, the third processing module 604 is used to: determine whether the positive pole-to-ground voltage difference is within a first threshold range, and obtain a historical negative pole-to-ground voltage difference; based on the historical negative pole-to-ground voltage difference and the negative pole-to-ground voltage difference, obtain an average of the negative pole-to-ground voltage difference; and perform current leakage monitoring based on the average of the negative pole-to-ground voltage difference and at least one preset negative pole-to-ground voltage difference threshold range.

[0118] In an optional implementation, the above device further includes a fourth processing module. As an example, see Figure 7 , Figure 7 This is a structural diagram of another DC cross-current monitoring and early warning device provided in an embodiment of the present application. Figure 7 As shown, the device 700 also includes a fourth processing module 705, which is used to: obtain the historical average value of the negative pole-to-ground voltage difference; obtain the negative pole-to-ground voltage difference slowdown value based on the average value of the negative pole-to-ground voltage difference and the average value of the negative pole-to-ground voltage difference; obtain the first predicted time length for the negative pole-to-ground voltage difference to reach the negative pole-to-ground voltage difference threshold range based on the negative pole-to-ground voltage difference slowdown value and the average value of the negative pole-to-ground voltage difference; and issue a power leakage warning based on the first predicted time length. Figure 7 Modules 701 to 704 in Figure 6 Modules 601 to 604 in the embodiment have the same structure and function.

[0119] In one implementation, the third processing module 604 is used to: determine that the negative pole-to-ground voltage difference is within a second threshold range, and obtain a historical positive pole-to-ground voltage difference; based on the historical positive pole-to-ground voltage difference and the positive pole-to-ground voltage difference, obtain an average of the positive pole-to-ground voltage difference; and perform electric leakage warning monitoring based on the average of the positive pole-to-ground voltage difference and at least one preset positive pole-to-ground voltage difference threshold range.

[0120] In one implementation, the apparatus further includes a fifth processing module. As an example, see Figure 8 , Figure 8 This is a structural diagram of another DC current leakage monitoring and early warning device provided in the embodiment of the present application. Figure 8As shown, the device 800 also includes a fifth processing module 805, which is used to: obtain the historical average value of the positive-to-ground voltage difference; obtain the positive-to-ground voltage difference slowdown value based on the average value of the positive-to-ground voltage difference and the average value of the positive-to-ground voltage difference; obtain the first predicted time length for the positive-to-ground voltage difference to reach the positive-to-ground voltage difference threshold range based on the positive-to-ground voltage difference slowdown value and the average value of the positive-to-ground voltage difference; and issue a power leakage warning based on the first predicted time length. Figure 8 Modules 801 to 804 in Figure 6 Modules 601 to 604 in the embodiment have the same structure and function.

[0121] In one implementation, the apparatus further includes a sixth processing module. As an example, see Figure 9 , Figure 9 This is a structural diagram of another DC current leakage monitoring and early warning device provided in the embodiment of the present application. Figure 9 As shown, the device 900 further includes a sixth processing module 905, which is used to: determine that the bus voltage difference is greater than a preset threshold and switch to the equalizing state. Figure 9 Modules 901 to 904 in Figure 6 Modules 601 to 604 in the embodiment have the same structure and function.

[0122] The apparatus of the present application embodiment can obtain bus voltage differences and ground voltage differences based on the bus voltages and ground voltages of different buses in a DC system. When the bus voltage differences meet preset conditions, current leakage monitoring and early warning can be performed based on the positive and negative pole-to-ground voltage differences. This enables precise monitoring of DC system current leakage faults.

[0123] It should be noted that the aforementioned explanation of the embodiment of the DC current leakage monitoring and early warning method is also applicable to the DC current leakage monitoring and early warning device of this embodiment, and will not be repeated here.

[0124] In order to implement the above embodiment, the present application also proposes an electronic device. Figure 10 , Figure 10 Schematic diagram of the structure of the electronic device provided in the embodiment of the present application. Figure 10 As shown, the electronic device 1000 includes: a processor 1001, and a memory 1002 communicatively connected to the processor 1001; the memory 1002 stores computer-executable instructions; the processor 1001 executes the computer-executable instructions stored in the memory to implement the method provided in the aforementioned embodiment.

[0125] In order to implement the above embodiments, the present application also proposes a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the methods provided by the above embodiments.

[0126] In order to implement the above embodiments, the present application also proposes a computer program product, including a computer program, which implements the methods provided by the above embodiments when executed by a processor.

[0127] In the description of this application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a way to describe the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0128] In the descriptions of the foregoing embodiments, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are mutually inconsistent.

[0129] 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 of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0130] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0131] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the 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 (a non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic devices), 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.

[0132] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can 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 can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0133] Those skilled in the art will understand that all or part of the steps in the method of the above embodiment can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0134] In addition, the functional units in the various embodiments of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into a module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0135] The storage medium mentioned above may be a read-only memory, a magnetic disk, or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application. Persons skilled in the art may make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A DC current leakage monitoring and early warning method, characterized in that: include: Obtain the bus voltage, positive pole to ground voltage, and negative pole to ground voltage of each bus segment in the DC system; obtaining a bus voltage difference based on the bus voltage; Obtaining a positive electrode-to-ground voltage difference based on the positive electrode-to-ground voltage, and obtaining a negative electrode-to-ground voltage difference based on the negative electrode-to-ground voltage; Determine that the bus voltage difference is greater than a preset bus voltage difference threshold, and perform current leakage monitoring and early warning based on the positive pole-to-ground voltage difference and the negative pole-to-ground voltage difference.

2. The method according to claim 1, characterized in that The monitoring and early warning of electrical leakage based on the positive electrode-to-ground voltage difference and the negative electrode-to-ground voltage difference includes: Determine that the positive electrode-to-ground voltage difference is within a first threshold range, and obtain a historical negative electrode-to-ground voltage difference; Obtaining an average of the negative electrode-to-ground voltage difference based on the historical negative electrode-to-ground voltage difference and the negative electrode-to-ground voltage difference; Based on the negative electrode-to-ground voltage difference average value and at least one preset negative electrode-to-ground voltage difference threshold range, electrical crosstalk monitoring is performed.

3. The method according to claim 2, characterized in that The method further comprises: Obtain the historical average value of the negative electrode-to-ground voltage difference; Obtaining a negative electrode-to-ground voltage difference slowdown amount based on the negative electrode-to-ground voltage difference average value and the negative electrode-to-ground voltage difference average value; Obtaining, based on the negative electrode-to-ground voltage difference ramp rate and the negative electrode-to-ground voltage difference average, a first predicted time duration for predicting that the negative electrode-to-ground voltage difference average will reach the negative electrode-to-ground voltage difference threshold range; A power leakage warning is performed based on the first predicted duration.

4. The method according to claim 1, wherein The monitoring and early warning of electrical leakage based on the positive electrode-to-ground voltage difference and the negative electrode-to-ground voltage difference includes: Determining that the negative electrode-to-ground voltage difference is within a second threshold range, and obtaining a historical positive electrode-to-ground voltage difference; Obtaining an average positive-pole-to-ground voltage difference based on the historical positive-pole-to-ground voltage difference and the positive-pole-to-ground voltage difference; Based on the positive electrode-to-ground voltage difference average value and at least one preset positive electrode-to-ground voltage difference threshold range, electric leakage early warning monitoring is performed.

5. The method according to claim 4, characterized in that The method further includes Obtain the historical average value of the positive electrode-to-ground voltage difference; Obtaining a positive electrode-to-ground voltage difference slowdown amount based on the positive electrode-to-ground voltage difference average value and the positive electrode-to-ground voltage difference average value; Based on the positive electrode-to-ground voltage difference ramp rate and the positive electrode-to-ground voltage difference average, obtaining a first predicted time duration for predicting that the positive electrode-to-ground voltage difference average reaches the positive electrode-to-ground voltage difference threshold range; A power leakage warning is performed based on the first predicted duration.

6. The method according to any one of claims 1 to 5, characterized in that Also includes: Determine that the bus voltage difference is greater than a preset threshold and switch to the equalizing state.

7. A DC current leakage monitoring and early warning device, characterized in that: include: An acquisition module is used to obtain the bus voltage, positive pole-to-ground voltage, and negative pole-to-ground voltage of each bus segment in the DC system; A first processing module, configured to obtain a bus voltage difference based on the bus voltage; a second processing module, configured to obtain a positive electrode-to-ground voltage difference based on the positive electrode-to-ground voltage, and to obtain a negative electrode-to-ground voltage difference based on the negative electrode-to-ground voltage; The third processing module is used to determine that the bus voltage difference is greater than a preset bus voltage difference threshold, and perform electrical leakage monitoring and early warning based on the positive pole-to-ground voltage difference and the negative pole-to-ground voltage difference.

8. An electronic device, characterized in that: include: a processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to any one of claims 1 to 6 when executed by a processor.

10. A computer program product, characterized in that The invention comprises a computer program, which implements the method according to any one of claims 1 to 6 when being executed by a processor.

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