High-voltage Cable Partial Discharge Mode Diagnosis and Control Method and System

Abstract

The present application provides a method and system for diagnosing and controlling partial discharge modes of a high-voltage cable, including obtaining a plurality of first detection signals from the plurality of ultrasonic detection devices; obtaining a plurality of second detection signals from the plurality of electrical signal detection devices; determining the discharge type and discharge location when partial discharge occurs in the high-voltage cable according to the plurality of first detection signals and the plurality of second detection signals; when the power factor corresponding to the discharge location is less than a preset value, calculating a reactive power compensation value according to the power factor, and determining a reactive power compensation device according to the discharge type; determining a setting value of the reactive power compensation device according to the reactive power compensation value, so that the reactive power compensation device performs reactive power compensation based on the setting value. The accuracy of the obtained reactive power compensation value can be improved, and the stability and power supply efficiency of the power supply network can be ensured.

Description

Technical Field

[0001] This application belongs to the field of high-voltage cables, and specifically relates to a method and system for diagnosing and controlling partial discharge modes of high-voltage cables. Background Art

[0002] Partial discharge in a high-voltage cable refers to a discharge phenomenon occurring in a local area due to reasons such as local insulation defects or excessive electric field strength in the high-voltage cable. When partial discharge occurs in a high-voltage cable, it may cause the power factor to decrease. If not adjusted in time, it will affect the power supply stability and efficiency of the power system. Summary of the Invention

[0003] Embodiments of this application provide a method and system for diagnosing and controlling partial discharge modes of high-voltage cables to enhance the power supply stability and efficiency of the power system when partial discharge occurs, and at the same time improve the accuracy of the obtained reactive power compensation value.

[0004] In a first aspect, embodiments of this application provide a method for diagnosing and controlling partial discharge modes of high-voltage cables, which is applied to a partial discharge diagnosis device of a high-voltage cable partial discharge mode diagnosis and control system. The high-voltage cable partial discharge mode diagnosis and control system includes the partial discharge diagnosis device, a plurality of ultrasonic detection devices and a plurality of electrical signal detection devices arranged along the high-voltage cable. At least one electrical signal detection device is arranged between any two ultrasonic detection devices. The partial discharge diagnosis device is communicatively connected to the plurality of ultrasonic detection devices and the plurality of electrical signal detection devices respectively. The method includes:

[0005] Obtain a plurality of first detection signals from the plurality of ultrasonic detection devices;

[0006] Obtain a plurality of second detection signals from the plurality of electrical signal detection devices, where the second detection signals include current signals and voltage signals;

[0007] Determine the discharge type and discharge location when partial discharge occurs in the high-voltage cable according to the plurality of first detection signals and the plurality of second detection signals. The discharge types include internal discharge and external discharge;

[0008] When the first power factor corresponding to the discharge location is less than a preset value, calculate a reactive power compensation value according to the first power factor, and determine a reactive power compensation device according to the discharge type. Different discharge types correspond to different reactive power compensation devices;

[0009] Determine the setting value of the reactive power compensation device according to the reactive power compensation value, so that the reactive power compensation device performs reactive power compensation based on the setting value.

[0010] Second aspect, an embodiment of the present application provides a high-voltage cable partial mode diagnosis control system, including a partial discharge diagnosis device, a plurality of ultrasonic detection devices and a plurality of electrical signal detection devices arranged along the high-voltage cable. The partial discharge diagnosis device is communicatively connected to the plurality of ultrasonic detection devices and the plurality of electrical signal detection devices respectively. Among them,

[0011] the partial discharge diagnosis device is configured to perform the operations performed by the partial discharge diagnosis device in the first aspect as described above;

[0012] the ultrasonic detection device is configured to perform the operations performed by the ultrasonic detection device in the first aspect as described above;

[0013] the electrical signal detection device is configured to perform the operations performed by the electrical signal detection device in the first aspect as described above.

[0014] It can be seen that in this embodiment, the high-voltage cable partial discharge mode diagnosis control system first obtains a plurality of first detection signals from the plurality of ultrasonic detection devices, then obtains a plurality of second detection signals from the plurality of electrical signal detection devices. The second detection signals include current signals and voltage signals. Then, according to the plurality of first detection signals and the plurality of second detection signals, the discharge type and discharge location when the high-voltage cable has a partial discharge phenomenon are determined. The discharge type includes internal discharge and external discharge. Then, when the first power factor corresponding to the discharge location is less than a preset value, the reactive power compensation value is calculated according to the first power factor, and the reactive power compensation device is determined according to the discharge type. Different discharge types correspond to different reactive power compensation devices. Finally, the setting value of the reactive power compensation device is determined according to the reactive power compensation value, so that the reactive power compensation device performs reactive power compensation based on the setting value.

[0015] Since when a high-voltage cable has a partial discharge, the power factor may decrease. This decrease is usually due to the phase difference between the current and voltage caused by the partial discharge, resulting in an increase in reactive power in the system. Therefore, the excess reactive power generated by the partial discharge can be offset by compensating the reactive power to improve the power factor. The partial discharge diagnosis device in this solution realizes the function of timely compensating reactive power for the high-voltage cable based on the discharge type and discharge location when the power factor decreases, and at the same time improves the accuracy of the obtained reactive power compensation value, ensuring the stability and power supply efficiency of the power supply network when a partial discharge occurs. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of the composition of a high-voltage cable partial discharge mode diagnosis and control system provided by an embodiment of the present application;

[0018] Figure 2 It is a schematic diagram of the structure of a partial discharge diagnosis device provided by an embodiment of the present application;

[0019] Figure 3 It is a schematic flowchart of a high-voltage cable partial discharge mode diagnosis and control method provided by an embodiment of the present application;

[0020] Figure 4 It is a schematic diagram of the device location provided by an embodiment of the present application. Detailed implementation manners

[0021] In order to enable those skilled in the art to better understand the solutions of the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present application.

[0022] The terms "first", "second", etc. in the specification and claims of the present application and the above drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0023] Referring to "embodiment" herein means that a specific feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0024] Statement: The data obtained in this solution are all from legal sources and are used for legal purposes.

[0025] Currently, when partial discharge occurs in a high-voltage cable, it may cause the power factor to decrease. If it cannot be adjusted in time, it will affect the power supply stability and efficiency of the power system.

[0026] In view of the above problems, the embodiments of the present application provide a method and system for diagnosing and controlling the partial discharge mode of a high-voltage cable. The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0027] Please refer to Figure 1 , Figure 1 , which is a schematic diagram of the composition of a partial discharge mode diagnosis and control system for a high-voltage cable provided by the embodiments of the present application. The partial discharge mode diagnosis and control system 10 for a high-voltage cable includes a partial discharge diagnosis device 102, a plurality of ultrasonic detection devices 101, and a plurality of electrical signal detection devices 103. The plurality of ultrasonic detection devices 101 and the plurality of electrical signal detection devices 103 are respectively arranged along the high-voltage cable, and at least one electrical signal detection device 103 is arranged between any two ultrasonic detection devices 101. The partial discharge diagnosis device 102 is communicatively connected to the plurality of ultrasonic detection devices 101 and the plurality of electrical signal detection devices 103 respectively. In a specific implementation, the electrical signal detection device 103 can be arranged at the high-voltage cable joint.

[0028] Please refer to Figure 2 , Figure 2 , which is a schematic structural diagram of a partial discharge diagnosis device provided by the embodiments of the present application. The partial discharge diagnosis device 102 includes a processor 120, a memory 130, a communication interface 140, and one or more programs 131. Among them, the one or more programs 131 are stored in the memory 130 and are configured to be executed by the processor 120. The one or more programs 131 include instructions for executing any step in the following method embodiments. In a specific implementation, the processor 120 is used to execute any step executed by the partial discharge diagnosis device in the following method embodiments, and when performing data transmission such as sending, the communication interface 140 can be selectively called to complete the corresponding operation.

[0029] Please refer to Figure 3 , Figure 3 , which is a schematic flowchart of a method for diagnosing and controlling the partial discharge mode of a high-voltage cable provided by the embodiments of the present application. The method for diagnosing and controlling the partial discharge mode of a high-voltage cable includes the following steps.

[0030] S301, obtain a plurality of first detection signals from the plurality of ultrasonic detection devices.

[0031] Among them, each ultrasonic detection device is responsible for detecting partial discharge within a certain distance in the high-voltage cable. When partial discharge occurs, physical effects such as high temperature, high pressure, and electromagnetic fields will be generated. These effects will cause local changes in the medium, such as gas release, local temperature rise, etc. These changes will cause phenomena such as scattering, absorption, and refraction of ultrasonic waves. After the ultrasonic detection device receives the reflected sound wave, it will convert it into an electrical signal, and then based on the characteristics such as the waveform and amplitude corresponding to the electrical signal, it can be determined whether partial discharge occurs.

[0032] S302, obtain a plurality of second detection signals from the plurality of electrical signal detection devices.

[0033] Among them, the second detection signal includes a current signal and a voltage signal. Partial discharge will cause instability or mutation of the current in the cable, so it can be determined whether partial discharge occurs by detecting the current signal and the voltage signal.

[0034] S303, determine the discharge type and discharge position when partial discharge exists in the high-voltage cable according to the plurality of first detection signals and the plurality of second detection signals.

[0035] Among them, the discharge type includes internal discharge and external discharge. Internal discharge and external discharge of the high-voltage cable are two different types of discharge phenomena. Internal discharge refers to the discharge phenomenon that occurs inside the cable insulation material. This kind of discharge is usually caused by defects, aging, damage or external stress of the insulation material. For example, when there are defects such as air bubbles, foreign objects, moisture, cracks, etc. in the cable insulation material, local discharge may occur under high electric fields. External discharge occurs in the external environment of the cable, usually due to damage, rupture of the cable outer sheath or local defects on the outer surface of the insulation material. For example, in an environment with high humidity, high temperature or chemical corrosion, the cable outer sheath may be damaged, exposing the internal conductor and insulation material.

[0036] In a possible embodiment, determining the discharge type and discharge position of partial discharge according to the first detection signal and the second detection signal includes: determining whether there is a target first detection signal in the plurality of first detection signals, and the frequency of the target first detection signal is greater than a preset frequency; if there is the target first detection signal, determine that the discharge type is internal discharge; if there is no target first detection signal, determine whether there is a target second detection signal in the plurality of second detection signals, and the current change value corresponding to the target second detection signal is greater than a preset value; if there is the target second detection signal, determine that the discharge type is external discharge.

[0037] Among them, when the partial discharge is an internal discharge, relatively strong sound waves are usually generated. At this time, the frequency of the first detection signal obtained is relatively high, while external discharge may generate weaker sound waves, and the frequency of the first detection signal at this time is relatively low. Therefore, the discharge type can be directly determined based on the frequency of the first detection signal. If there is no target first detection signal, it may be an external discharge or there is no partial discharge phenomenon. Then, at this time, it can be further determined according to the second detection signal. The second detection signal at this time can refer to the current signal in the second detection signal. External discharge refers to the discharge occurring on the surface of the cable insulation or in the air gap or insulating material near it. External discharge usually causes a large instantaneous current change because it may involve ionization in the air and instability of the current path. Internal discharge refers to the discharge occurring at the defect inside the cable insulation or inside the insulating material. Internal discharge may cause a relatively stable and continuous current change because the discharge path is relatively determined and not affected by the external environment. Therefore, if a target second detection signal is detected, it can be considered that there is an external discharge. In a specific implementation, when the target second detection signal is detected, the spectral characteristics of the target second detection signal can also be obtained. When the spectral characteristics of the target second detection signal match the preset spectral characteristics, it can be considered that there is an external discharge.

[0038] It can be seen that in this embodiment, comprehensively determining whether the partial discharge type is external discharge or internal discharge based on the first detection signal and the second detection signal can improve the convenience and efficiency of determining the partial discharge type.

[0039] In a possible embodiment, determining the discharge type and discharge position of the partial discharge according to the first detection signal and the second detection signal includes: when the discharge type is the internal discharge, determining the acquisition time of obtaining the target first detection signal, and determining the discharge position according to the acquisition time; when the discharge type is the external discharge, determining the target electrical signal detection device corresponding to the target second detection signal; when there are multiple target electrical signal detection devices, determining the midpoint of the multiple target electrical signal detection devices as the discharge position; when there is one target electrical signal detection device, determining the position of the target electrical signal detection device as the discharge position.

[0040] Among them, during internal discharge, the discharge position can be determined according to the traveling wave speed of the ultrasonic wave and the time of the obtained target first detection signal. When there are multiple target electrical signal detection devices, the possible discharge position may be between the multiple target electrical signal detection devices, so that multiple target electrical signal detection devices all obtain the target second detection signal. Therefore, the midpoint of the multiple target electrical signal detection devices can be directly determined as the power generation position. In a specific implementation, the multiple target electrical signal detection devices can be two. For example Figure 4 as shown Figure 4It is a schematic diagram of the device position provided by an embodiment of the present application. Figure 4 It shows that two ultrasonic detection devices are arranged along the high-voltage cable, namely the first ultrasonic detection device 401 and the second ultrasonic detection device 402. At the same time, it also includes two electrical signal detection devices, namely the first electrical signal detection device 403 and the second electrical signal detection device 404. If the partial discharge position occurs between the first electrical signal detection device 403 and the second electrical signal detection device 404, then both the first electrical signal detection device 403 and the second electrical signal detection device 404 may detect the target electrical signal.

[0041] It can be seen that in this embodiment, determining the discharge position according to the discharge type, the target first detection signal, and the target second detection signal can improve the efficiency of determining the discharge position.

[0042] In a possible embodiment, before determining the midpoint of the multiple target electrical signal detection devices as the discharge position, the method further includes: determining whether the multiple target electrical signal detection devices are adjacent target electrical signal detection devices; if they are adjacent target electrical signal detection devices, then determining the midpoint of the multiple target electrical signal detection devices as the discharge position; if they are not adjacent target electrical signal detection devices, then determining each non-adjacent target electrical signal detection device as a discharge position.

[0043] Among them, when there are multiple target electrical signal detection devices, if these multiple target electrical signal detection devices are adjacent, their midpoint can be determined as the discharge position. If they are not completely adjacent, the midpoint of the adjacent multiple target electrical signal detection devices can be determined as a discharge position, and the other non-adjacent target electrical signal detection devices are respectively a discharge position. In specific implementation, the multiple target electrical signal detection devices are greater than or equal to two.

[0044] It can be seen that in this embodiment, determining the discharge position according to the positional relationship of the target electrical signal detection devices can improve the accuracy of determining the discharge position.

[0045] S304, when the first power factor corresponding to the discharge position is less than a preset value, calculating a reactive power compensation value according to the first power factor, and determining a reactive power compensation device according to the discharge type.

[0046] Among them, the reactive power compensation devices corresponding to different discharge types are different. The reactive power compensation device can be a capacitor component or an inductor component, or a dynamic reactive power compensation device or a static synchronous compensator, etc. For external discharges, a capacitor component or an inductor component, or a static synchronous compensator, etc. can be selected. For internal discharges, a dynamic reactive power compensation device can be selected. The reactive power compensation device can be set at the end of the cable, or in the medium-voltage cabinet or distribution box near the partial discharge location.

[0047] In specific implementation, the power factor is the cosine value of the phase difference between the reference current signal and the reference voltage signal at the discharge location. When the discharge type is internal discharge, the electrical signal detection device closest to the discharge location is determined as the reference electrical signal detection device, and the current signal and voltage signal of the reference electrical signal detection device are determined as the reference current signal and the reference voltage signal respectively. When the discharge type is external discharge, if there are multiple target electrical signal detection devices, the electrical signal detection device with the largest change value of the current signal and voltage signal among the multiple target electrical signal detection devices corresponding to the discharge location is determined as the reference electrical signal detection device. If there is only one target electrical signal detection device, the target electrical signal detection device is determined as the reference electrical signal detection device. When the first power factor is less than the preset value, it will affect the stability and power supply efficiency of the power supply system. Therefore, it is necessary to compensate reactive power in a timely manner. Compensating reactive power can improve the voltage stability and power factor of the cable system, reduce the voltage fluctuation and harmonic content of the system, and improve the stability and reliability of the cable system. At the same time, it helps to reduce the occurrence frequency of partial discharges and avoid partial discharges occurring at other locations before the current partial discharge is repaired. In specific implementation, the preset value can be 0.9.

[0048] In a possible embodiment, calculating the reactive power compensation value according to the first power factor includes: obtaining the reference second detection signal corresponding to the discharge location; obtaining the active power corresponding to the discharge location according to the reference second detection signal; obtaining the first power factor angle of the first power factor; obtaining the first tangent value of the first power factor angle; obtaining the second tangent value of the second power factor angle of the second power factor, where the value of the second power factor is the preset value; calculating the reactive power compensation value according to the active power, the first tangent value, the second tangent value, the first power factor, and the second power factor.

[0049] Among them, the second detection signal corresponding to the discharge position includes a reference current signal and a reference voltage signal. The acquisition methods of the reference current signal and the reference voltage signal are the same as the above methods, and will not be elaborated here. The power factor angle is the arccosine value of the power factor. The active power at the discharge position is determined according to the reference voltage signal, the reference current signal, and the phase difference between the reference voltage signal and the reference current signal. The second power factor is the power factor that is desired to be achieved, such that after reactive power compensation is performed on the high-voltage cable, the value that the power factor corresponding to the discharge position is desired to reach. It can be calculated by the following formula:

[0050]

[0051] Among them, Q is the reactive power compensation value, θ1 is the first power factor angle, θ2 is the second power factor angle, P is the active power, μ1 is the first power factor, and μ2 is the second power factor.

[0052] It can be seen that in this embodiment, calculating the reactive power compensation value based on the target power factor, the current power factor, and the active power can improve the accuracy of calculating the reactive power compensation value.

[0053] In a possible embodiment, before calculating the reactive power compensation value according to the active power, the first tangent value, and the second tangent value, the method further includes: obtaining the equivalent reactance of the discharge position; obtaining the preset loss factor corresponding to the high-voltage cable; obtaining the target reactive power of the discharge position according to the reference second detection signal, the equivalent reactance, and the preset loss factor; and calculating the reactive power compensation value according to the active power, the first tangent value, and the second tangent value includes: calculating the reactive power compensation value according to the target reactive power, the active power, the first tangent value, and the second tangent value.

[0054] Among them, when calculating the reactive power compensation value, the reactive power generated by the partial discharge itself can also be considered, such that when calculating the reactive power compensation value, the reactive power generated by the partial discharge itself also needs to be subtracted. The target reactive power can be obtained through the following calculation formula:

[0055]

[0056] Among them, S is the target reactive power, U is the reference voltage value in the reference second detection signal corresponding to the discharge position, α is the preset loss factor, and X is the equivalent reactance of the discharge position. The preset loss factor and the equivalent reactance can determine the cable section of the high-voltage cable to which the discharge position belongs according to the discharge position, and then look up the corresponding preset loss factor and equivalent reactance of the cable section.

[0057] It can be seen that in this embodiment, when calculating the reactive power compensation value, the reactive power generated based on partial discharge is also considered, which can improve the accuracy of the obtained reactive power compensation value.

[0058] In a possible embodiment, obtaining the equivalent reactance of the discharge position includes: determining the position type to which the discharge position in the high-voltage cable belongs, where the position type is used to indicate the cable section number where the discharge position is located; and determining the equivalent reactance according to the position type.

[0059] Among them, the loss factor of partial discharge in the high-voltage cable is used to describe the energy loss between dielectrics, and this loss factor is related to the material properties of the high-voltage cable, the cable structure, the working environment of the cable, and the service time of the cable, etc. Therefore, it is possible to obtain the loss factor of each cable section in advance according to the material properties, cable structure, working environment of the cable, and service time of each cable section in the high-voltage cable, and generate a query table. When it is necessary to obtain the loss factor of the discharge position, the corresponding loss factor can be directly queried based on the cable section number where the discharge position is located.

[0060] It can be seen that in this example, querying the loss factor according to the cable section where the discharge position is located can ensure the accuracy of the obtained loss factor, so as to improve the accuracy of the obtained reactive power compensation value.

[0061] In a possible embodiment, after calculating the reactive power compensation value according to the target reactive power, the active power, the first tangent value, and the second tangent value, the method further includes: determining whether the discharge position is within a target range, where the target range is a range with a distance less than a preset distance from a special device, and the special device includes a transformer, a load, or a switching device; if it is within the target range, determining a reactive power fluctuation value according to the discharge position; calculating a final reactive power compensation value according to the reactive power compensation value and the reactive power fluctuation value; and determining the setting value of the reactive power compensation device according to the reactive power compensation value includes: determining the setting value of the reactive power compensation device according to the final reactive power compensation value.

[0062] Among them, when partial discharge occurs in the high-voltage cable near a load, a transformer, or a switching device, the reactive power that needs to be compensated may be more than the previously calculated reactive power. Therefore, when the discharge position belongs to the target range, it is necessary to increase the compensation of reactive power based on the reactive power fluctuation value.

[0063] It can be seen that in this example, when calculating the reactive power compensation value, it is also considered whether the discharge position is around a transformer, a load, and a switching device, which can improve the accuracy of the obtained reactive power compensation value.

[0064] In a possible embodiment, determining the reactive power fluctuation value according to the discharge position includes: determining the fluctuation coefficient corresponding to the special device included in the target range; determining the distance between the discharge position and the special device; and determining the reactive power fluctuation value according to the fluctuation system and the distance.

[0065] Among them, the reactive power fluctuation values corresponding to the discharge positions near different special devices are different. For example, the reactive power fluctuation value corresponding to a partial discharge occurring near a transformer is larger than that corresponding to a switchgear. Moreover, the closer to the special device, the more value needs to be compensated. Therefore, the fluctuation coefficients corresponding to different special devices are different, and the fluctuation values corresponding to the distances between the discharge positions and the special devices are also different.

[0066] It can be seen that in this embodiment, determining the reactive power fluctuation value according to the type of the special device and the distance between the discharge position and the special device can improve the accuracy of the obtained reactive power compensation value.

[0067] S305. Determine the setting value of the reactive power compensation device according to the reactive power compensation value, so that the reactive power compensation device performs reactive power compensation based on the setting value.

[0068] It can be seen that in this embodiment, the high-voltage cable partial discharge mode diagnosis and control system first obtains a plurality of first detection signals from the plurality of ultrasonic detection devices, then obtains a plurality of second detection signals from the plurality of electrical signal detection devices, the second detection signals include current signals and voltage signals, and then determines the discharge type and discharge position when the high-voltage cable has a partial discharge phenomenon according to the plurality of first detection signals and the plurality of second detection signals, the discharge type includes internal discharge and external discharge, and then when the power factor corresponding to the discharge position is less than a preset value, calculates the reactive power compensation value according to the power factor, and determines the reactive power compensation device according to the discharge type, different discharge types correspond to different reactive power compensation devices, and finally determines the setting value of the reactive power compensation device according to the reactive power compensation value, so that the reactive power compensation device performs reactive power compensation based on the setting value. In this way, the partial discharge diagnosis device realizes the function of timely compensating reactive power for the high-voltage cable based on the discharge type and discharge position when the reactive power drops, ensuring the stability and power supply efficiency of the power supply network when partial discharge occurs.

[0069] Among them, all relevant contents of each scenario involved in the above method embodiment can be cited in the function description of the corresponding functional module, and will not be repeated here. The above financial data processing device 30 can execute the above Figure 3 shown financial data processing method.

[0070] The above embodiments can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired or wireless manner. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more collections of available media. The available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media. The semiconductor media can be a solid-state drive.

[0071] The embodiments of the present application further provide a computer storage medium, wherein the computer storage medium stores a computer program for electronic data exchange, and the computer program causes the computer to execute part or all of the steps of any of the methods described in the above method embodiments. The above computer includes an electronic device.

[0072] The embodiments of the present application further provide a computer program product. The above computer program product includes a non-transitory computer-readable storage medium storing a computer program, and the above computer program is operable to cause the computer to execute part or all of the steps of any of the methods described in the above method embodiments. The computer program product can be a software installation package, and the above computer includes an electronic device.

[0073] It should be noted that, for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present application is not limited by the described action sequence, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present application.

[0074] In the above embodiments, the descriptions of the various embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0075] In several embodiments provided by the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the above units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection of the device or unit can be in an electrical or other form.

[0076] The units described above as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place, or they can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0077] In addition, in each embodiment of the present application, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0078] If the above integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a memory and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the above methods in each embodiment of the present application. And the aforementioned memory includes: USB flash drive, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0079] Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing relevant hardware through a program. The program can be stored in a computer-readable memory. The memory can include: flash drive, read-only memory (abbreviation: ROM), random access memory (abbreviation: RAM), magnetic disk or optical disk, etc.

[0080] The embodiments of the present application have been described in detail above. Specific examples are used herein to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A diagnostic control method for partial discharge patterns of high-voltage cables, characterized in that, A partial discharge diagnosis device applied to a partial discharge mode diagnosis and control system for high-voltage cables. The high-voltage cable partial discharge mode diagnosis and control system includes the partial discharge diagnosis device, a plurality of ultrasonic detection devices arranged along the high-voltage cable, and a plurality of electrical signal detection devices. At least one electrical signal detection device is arranged between any two ultrasonic detection devices. The partial discharge diagnosis device is communicatively connected to the plurality of ultrasonic detection devices and the plurality of electrical signal detection devices respectively. The method includes: Obtain a plurality of first detection signals from the plurality of ultrasonic detection devices; Obtain a plurality of second detection signals from the plurality of electrical signal detection devices. The second detection signals include current signals and voltage signals; Determine the discharge type and discharge location when there is a partial discharge phenomenon in the high-voltage cable according to the plurality of first detection signals and the plurality of second detection signals. The discharge types include internal discharge and external discharge; When the first power factor corresponding to the discharge location is less than a preset value, calculate the reactive power compensation value according to the first power factor, and determine the reactive power compensation device according to the discharge type. Different discharge types correspond to different reactive power compensation devices; Determine the setting value of the reactive power compensation device according to the reactive power compensation value, so that the reactive power compensation device performs reactive power compensation based on the setting value.

2. The method according to claim 1, wherein The determining the discharge type and discharge location of the partial discharge according to the first detection signal and the second detection signal includes: Determine whether there is a target first detection signal in the plurality of first detection signals. The frequency of the target first detection signal is greater than a preset frequency; If there is the target first detection signal, determine that the discharge type is internal discharge; If there is no target first detection signal, determine whether there is a target second detection signal in the plurality of second detection signals. The current change value corresponding to the target second detection signal is greater than a preset value; If there is the target second detection signal, determine that the discharge type is external discharge.

3. The method according to claim 2, wherein The determining the discharge type and discharge location of the partial discharge according to the first detection signal and the second detection signal includes: When the discharge type is the internal discharge, determine the acquisition time of obtaining the target first detection signal, and determine the discharge location according to the acquisition time; When the discharge type is the external discharge, determine the target electrical signal detection device corresponding to the target second detection signal. When there are multiple target electrical signal detection devices, determine the midpoint of the multiple target electrical signal detection devices as the discharge location. When there is one target electrical signal detection device, determine the location of the target electrical signal detection device as the discharge location.

4. The method according to claim 3, wherein Before determining the midpoint of the multiple target electrical signal detection devices as the discharge location, the method further includes: Determine whether the multiple target electrical signal detection devices are adjacent target electrical signal detection devices; If they are adjacent target electrical signal detection devices, determine the midpoint of the multiple target electrical signal detection devices as the discharge location; If it is not an adjacent target electrical signal detection device, determine each non-adjacent target electrical signal detection device as a discharge position.

5. The method according to claim 1, characterized in that The calculating the reactive power compensation value according to the first power factor includes: Obtain a reference second detection signal corresponding to the discharge position; Obtain the active power corresponding to the discharge position according to the reference second detection signal; Obtain a first power factor angle of the first power factor; Obtain a first tangent value of the first power factor angle; Obtain a second tangent value of a second power factor angle of a second power factor, where the value of the second power factor is the preset value; Calculate the reactive power compensation value according to the active power, the first tangent value, the second tangent value, the first power factor, and the second power factor.

6. The method according to claim 5, characterized in that, Before calculating the reactive power compensation value according to the active power, the first tangent value, and the second tangent value, the method further includes: Obtain an equivalent reactance of the discharge position; Obtain a preset loss factor corresponding to the high-voltage cable; Obtain a target reactive power of the discharge position according to the reference second detection signal, the equivalent reactance, and the preset loss factor; The calculating the reactive power compensation value according to the active power, the first tangent value, and the second tangent value includes: Calculate the reactive power compensation value according to the target reactive power, the active power, the first tangent value, and the second tangent value.

7. The method according to claim 6, characterized in that, The obtaining the equivalent reactance of the discharge position includes: Determine a position type to which the discharge position belongs in the high-voltage cable, where the position type is used to indicate the cable section number where the discharge position is located; Determine the equivalent reactance according to the position type.

8. The method according to claim 7, characterized in that, After calculating the reactive power compensation value according to the target reactive power, the active power, the first tangent value, and the second tangent value, the method further includes: Determine whether the discharge position is within a target range, where the target range is a range where the distance from a special device is less than a preset distance, and the special device includes a transformer, a load, or a switching device; If it is within the target range, determine a reactive power fluctuation value according to the discharge position; Calculate a final reactive power compensation value according to the reactive power compensation value and the reactive power fluctuation value; The determining the setting value of the reactive power compensation device according to the reactive power compensation value includes: Determine the setting value of the reactive power compensation device according to the final reactive power compensation value.

9. The method according to claim 8, wherein The determining the reactive power fluctuation value according to the discharge position includes: Determine a fluctuation coefficient corresponding to the special device included in the target range; Determine the distance between the discharge position and the special device; Determine the reactive power fluctuation value according to the fluctuation coefficient and the distance.

10. A high-voltage cable partial discharge pattern diagnosis and control system, characterized in that, It includes a partial discharge diagnosis device and a plurality of ultrasonic detection devices and a plurality of electrical signal detection devices arranged along a high-voltage cable, and the partial discharge diagnosis device is respectively communicatively connected to the plurality of ultrasonic detection devices and the plurality of electrical signal detection devices, where The partial discharge diagnosis device is configured to perform the operations performed by the partial discharge diagnosis device in any one of the methods of claims 1-9. The ultrasonic detection device is used to perform the operations performed by the ultrasonic detection device in any one of Claims 1-9; The electrical signal detection device is used to perform the operations performed by the electrical signal detection device in any one of Claims 1-9.

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