Method and device for maintaining a common grounding electrode system of a direct current transmission and computer equipment

Abstract

The application discloses a kind of DC power transmission common grounding electrode system maintenance method, device and computer equipment.Therein, the method comprises: establishing simulation model including DC power transmission common grounding electrode system and target DC power transmission line, wherein the DC power transmission common grounding electrode system includes: multiple grounding electrode lines and common grounding electrode, wherein multiple grounding electrode lines are used to connect corresponding multiple DC power transmission lines to common grounding electrode, and multiple DC power transmission lines include target DC power transmission line;According to simulation model, the electric power data of target grounding electrode line corresponding to target DC power transmission line under predetermined working condition is determined;According to electric power data, target grounding electrode line is divided into multiple sections of line;Multiple sections of line are maintained respectively.The application solves the technical problem that there is the risk of electric shock near the tower on the maintenance line caused by the whole section maintenance of common grounding electrode line in the related art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power system maintenance, in particular to a DC power transmission common grounding electrode system maintenance method, device and computer equipment. BACKGROUND

[0002] High voltage direct current (HVDC) transmission lines work in a bipolar operation mode in a normal operation state, and the direct current is returned through the transmission lines of two poles to form a loop. However, in the case of system debugging or fault, a monopole operation mode with the earth as a loop is used. The direct current grounding electrode is an important facility in the direct current transmission project, which undertakes the task of guiding the earth current and unbalanced current in the monopole earth return operation mode and the bipolar operation mode, and plays a role in restraining the neutral point potential of the converter valve in the normal bipolar operation mode, thereby protecting the safety of the converter valve. In recent years, the earth current of the direct current transmission projects built in China is getting larger and larger, and the area occupied by the grounding electrode is also getting larger and larger. In addition, with more and more grounding electrodes of the direct current transmission projects being built, the land suitable for building the grounding electrodes is getting less and less, and the operation of multiple direct current transmission systems using one grounding electrode can greatly reduce the area occupied and thereby reduce the project investment.

[0003] The common grounding electrode site can make the operation mode of the direct current transmission system of the common grounding electrode site more flexible, improve the reliability of the operation of the direct current system, reduce the number of grounding electrode sites, and improve the utilization efficiency of the grounding electrode. In addition, when the multiple direct current systems use the common grounding electrode to operate in the monopole earth return mode of different polarity, the current flowing into the grounding electrode is the difference between the currents of the two direct current systems, which eliminates or reduces the influence on the alternating current power system and other influences on the environment, and can reduce the loss of electric energy on the line, thereby having obvious economic and social benefits.

[0004] The common grounding electrode also brings new problems in the maintenance of the grounding electrode line. When one loop is powered off and the other loop operates in a monopole earth mode, the earth potential near the site will be high, which threatens the personal safety of the maintenance line personnel.

[0005] At present, there is no effective solution to the above problems. SUMMARY

[0006] The embodiments of the present application provide a DC power transmission common grounding electrode system maintenance method, device and computer equipment, which at least solve the technical problem of the risk of electric shock near the tower on the maintenance line caused by the whole section maintenance of the common grounding electrode line in the related art.

[0007] According to an aspect of some embodiments of the present application, there is provided a method for maintenance of a DC power transmission common grounding electrode system, comprising: establishing a simulation model comprising the DC power transmission common grounding electrode system and a target DC power transmission line, wherein the DC power transmission common grounding electrode system comprises a plurality of grounding electrode lines and a common grounding electrode, the plurality of grounding electrode lines are used to connect a plurality of corresponding DC power transmission lines to the common grounding electrode, and the plurality of DC power transmission lines comprises the target DC power transmission line; determining, according to the simulation model, power data of a target grounding electrode line corresponding to the target DC power transmission line under a predetermined working condition; and dividing the target grounding electrode line into a plurality of segments according to the power data, and performing maintenance on the plurality of segments respectively.

[0008] Optionally, the determining, according to the simulation model, of the power data of the target grounding electrode line corresponding to the target DC power transmission line under the predetermined working condition comprises: determining, according to the simulation model, a plurality of first conductor potentials of a plurality of towers included in the target grounding electrode line under the predetermined working condition, and a plurality of first ground potentials of the plurality of towers respectively; and determining a plurality of first potential differences corresponding to the plurality of towers respectively, wherein the first potential differences are differences between the first conductor potentials and the first ground potentials corresponding to the plurality of towers respectively, and the power data comprises the first potential differences.

[0009] Optionally, the dividing of the target grounding electrode line into the plurality of segments according to the power data comprises: marking a tower corresponding to a first potential difference exceeding a first threshold as a dangerous tower; determining a target tower closest to the dangerous tower and having a type of strain tower; and dividing the target grounding electrode line into the plurality of segments according to the target tower.

[0010] Optionally, the dividing of the target grounding electrode line into the plurality of segments according to the target tower comprises: generating an instruction for opening a common electrode switch in the target tower, and dividing the target grounding electrode line into the plurality of segments.

[0011] Optionally, the performing of the maintenance on the plurality of segments respectively comprises: determining, according to the simulation model, a plurality of second conductor potentials of a plurality of towers included in the plurality of segments under the predetermined working condition, and a plurality of second ground potentials of the plurality of towers respectively; determining a plurality of second potential differences corresponding to the plurality of towers respectively, wherein the second potential differences are differences between the second conductor potentials and the second ground potentials corresponding to the plurality of towers respectively; and determining a maintenance mode of a tower corresponding to a second potential difference exceeding a second threshold as live-line maintenance.

[0012] Optionally, the simulation model comprising the HVDC common grounding electrode system and the target HVDC transmission line is established, comprising: obtaining engineering parameters and power parameters of the HVDC common grounding electrode system, engineering parameters and power parameters of the target HVDC transmission line, and a connection relationship between the HVDC common grounding electrode system and the target HVDC transmission line; establishing a simulation model of the HVDC common grounding electrode system according to the engineering parameters and the power parameters of the HVDC common grounding electrode system; establishing a simulation model of the target HVDC transmission line according to the engineering parameters and the power parameters of the target HVDC transmission line; and establishing the simulation model comprising the HVDC common grounding electrode system and the target HVDC transmission line according to the connection relationship between the HVDC common grounding electrode system and the target HVDC transmission line.

[0013] Optionally, the predetermined working condition is that the target grounding electrode line is in a maintenance working condition, and lines other than the target HVDC transmission line in the plurality of HVDC transmission lines are in a monopole ground operation working condition.

[0014] According to another aspect of the embodiment of the present application, a HVDC common grounding electrode system maintenance device is further provided, comprising: a simulation module, configured to establish a simulation model comprising a HVDC common grounding electrode system and a target HVDC transmission line, wherein the HVDC common grounding electrode system comprises a plurality of grounding electrode lines and a common grounding electrode, the plurality of grounding electrode lines are configured to connect a plurality of corresponding HVDC transmission lines to the common grounding electrode, and the plurality of HVDC transmission lines comprise the target HVDC transmission line; a determination module, configured to determine power data of a target grounding electrode line corresponding to the target HVDC transmission line in a predetermined working condition according to the simulation model; a segmentation module, configured to segment the target grounding electrode line into a plurality of line segments according to the power data; and a maintenance module, configured to perform maintenance on the plurality of line segments respectively.

[0015] According to still another aspect of the embodiment of the present application, a nonvolatile storage medium is further provided, comprising a stored program, wherein the nonvolatile storage medium controls a device in which the nonvolatile storage medium is located to perform any one of the HVDC common grounding electrode system maintenance methods described above when the program is running.

[0016] According to still another aspect of the embodiment of the present application, a computer device is further provided, comprising a processor configured to run a program, wherein the computer device performs any one of the HVDC common grounding electrode system maintenance methods described above when the program is running.

[0017] In the embodiment of the present application, the target grounding electrode line is divided into multiple sections for maintenance, a simulation model including a DC power transmission common grounding electrode system and a target DC power transmission line is established, wherein the DC power transmission common grounding electrode system includes multiple grounding electrode lines and a common grounding electrode, the multiple grounding electrode lines are used to connect corresponding multiple DC power transmission lines to the common grounding electrode, and the multiple DC power transmission lines include the target DC power transmission line; the power data of the target grounding electrode line corresponding to the target DC power transmission line under a predetermined working condition is determined according to the simulation model; the target grounding electrode line is divided into multiple sections according to the power data; and the multiple sections are maintained respectively, so as to reduce the potential difference between the ground potential near the tower on the maintenance line and the line potential, thereby realizing the technical effect of reducing the risk of electric shock near the tower on the maintenance line, and further solving the technical problem of the risk of electric shock near the tower on the maintenance line caused by the whole-section maintenance of the common grounding electrode line in the related art. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which are included to provide a further understanding of the present application and constitute a part of this application, illustrate embodiments of the present application and together with the description serve to explain the present application. In the drawings:

[0019] Figure 1 A hardware structure block diagram of a computer terminal for implementing the DC power transmission common grounding electrode system maintenance method is shown;

[0020] Figure 2 A flowchart of the DC power transmission common grounding electrode system maintenance method according to the embodiment of the present application is shown;

[0021] Figure 3 A structure block diagram of the DC power transmission common grounding electrode system maintenance device according to the embodiment of the present application is shown. DETAILED DESCRIPTION

[0022] In order to enable persons skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative labor should fall within the protection scope of the present application.

[0023] It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application and the above-described accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" 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 does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] According to an embodiment of the present application, a method for maintaining a DC power transmission common grounding electrode system is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in an order different from that shown herein.

[0025] The method embodiment provided by the first embodiment of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Figure 1 A hardware structure block diagram of a computer terminal for implementing the method for maintaining a DC power transmission common grounding electrode system is shown. As shown in Figure 1 , the computer terminal 10 can include one or more processors (the processor can include but is not limited to a microprocessor MCU or a programmable logic device FPGA processing device) (shown in 102a, 102b,..., 102n), a memory 104 for storing data. In addition, it can also include a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which can be included as one of the ports of the BUS bus), a network interface, a power supply and / or a camera. Those skilled in the art can understand that Figure 1 The structure shown is only schematic, which does not limit the structure of the above-mentioned electronic device. For example, the computer terminal 10 can also include more or fewer components than those shown in Figure 1 , or have a different configuration than that shown in Figure 1 .

[0026] It should be noted that the one or more processors and / or other data processing circuitry described above can be referred to herein generally as "data processing circuitry". The data processing circuitry can be embodied in whole or in part as software, hardware, firmware, or any combination thereof. Furthermore, the data processing circuitry can be a single standalone processing module, or incorporated in whole or in part within any one of the other elements of the computer terminal 10. As referred to in the embodiments of the present application, the data processing circuitry acts as a processor to control, for example, the selection of the variable resistance terminal path connected to the interface.

[0027] The memory 104 can be used to store software programs of application software and modules, such as the program instructions / data storage device corresponding to the DC power transmission common grounding electrode system maintenance method in the embodiments of the present application. The processor executes the software programs and modules stored in the memory 104 to perform various functional applications and data processing, that is, to implement the DC power transmission common grounding electrode system maintenance method of the application program described above. The memory 104 can include a high-speed random access memory, and can also include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some examples, the memory 104 can further include a memory remotely arranged with respect to the processor, and these remote memories can be connected to the computer terminal 10 through a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0028] The display can be, for example, a touch screen type liquid crystal display (LCD) that can enable a user to interact with the user interface of the computer terminal 10.

[0029] The use of the common grounding electrode brings new problems in the grounding electrode line maintenance. When one return is powered off and the other return line operates in single-pole ground mode, the incoming current can generate a high ground potential near the pole site, threatening the personal safety of the line maintenance personnel, mainly including: ① There is a risk of step potential and contact potential electric shock in the vicinity of the maintenance tower. When the line maintenance personnel climb the tower, there is a risk of step potential and contact potential electric shock when hanging and removing the temporary grounding line or personal safety line; ② There is a risk of excessive current in the personal safety line. When the maintenance personnel hang and remove the grounding line or personal safety line, the DC current flowing through the temporary grounding line and the personal safety line may be large, and there is a risk of electric arc burn when hanging and removing the grounding line or personal safety line.

[0030] In the related art, the influence of single-pole ground operation of one return on the maintenance of the DC grounding electrode line of the other return is not considered, and the present application proposes to maintain the grounding electrode line in sections, effectively reducing the risk of electric shock to the maintenance personnel. Figure 2 is a flowchart of the DC power transmission common grounding electrode system maintenance method according to the embodiments of the present application, as shown in Figure 2As shown, the method comprises the following steps:

[0031] In step S202, a simulation model comprising the DC power common grounding electrode system and the target DC power line is established, wherein the DC power common grounding electrode system comprises a plurality of grounding electrode lines and a common grounding electrode, and the plurality of grounding electrode lines are used to connect the corresponding plurality of DC power lines to the common grounding electrode, and the plurality of DC power lines comprise the target DC power line.

[0032] The common grounding electrode refers to the grounding electrode commonly used by the plurality of DC power lines, and the plurality of DC power lines are connected to the common grounding electrode through the plurality of grounding electrode lines respectively, that is, each DC power line is connected to the common grounding electrode through a grounding electrode line corresponding to it. The two ends of the grounding electrode line are the common grounding electrode and the converter station of the DC power line respectively.

[0033] In this step, when the target grounding electrode line in the DC power common grounding electrode system is maintained, the simulation model can be established first, and the target grounding electrode line in the maintenance state is simulated, and the simulation result can be used to determine how to maintain the target grounding electrode line. It should be noted that the power on the target DC power line connected to the target grounding electrode line in the actual power system also affects the target grounding electrode line, so the simulation model comprises the DC power common grounding electrode system and the target DC power line.

[0034] In step S204, the power data of the target grounding electrode line corresponding to the target DC power line under the predetermined working condition is determined according to the simulation model.

[0035] In this step, the power data of the target grounding electrode line under the predetermined working condition can be obtained by simulation according to the simulation model. The predetermined working condition can be the predetermined working condition of the DC power common grounding electrode system and the target DC power line when the target grounding electrode line is maintained. The power data of the target grounding electrode line under the predetermined working condition can be analyzed to guide the maintenance work of the target grounding electrode line.

[0036] In step S206, the target grounding electrode line is divided into a plurality of line sections according to the power data.

[0037] In step S208, the plurality of line sections are maintained respectively.

[0038] In this step, the target grounding electrode line can be divided into multiple sections according to the power data of the target grounding electrode line under the predetermined working condition, and the multiple sections can be maintained respectively. In the related art, the maintenance of the target grounding electrode line is generally the maintenance of the whole section, and the potential on the line and the ground potential may generate a large potential difference during the maintenance, which threatens the safety of the maintenance personnel. The present application proposes that the target grounding electrode line can be divided into multiple sections, the circuit connection between the multiple sections is disconnected, and the potential on each section after the division is greatly reduced on the basis of the potential on the whole section, so that the potential difference between the potential on each section and the ground potential during the maintenance of the multiple sections is smaller than the potential difference between the potential on the whole section and the ground potential, and the technical effect of reducing the risk of electric shock of the maintenance personnel can be achieved.

[0039] Through the above steps, the purpose of reducing the potential difference between the ground potential near the tower on the maintenance line and the line potential can be achieved, thereby achieving the technical effect of reducing the risk of electric shock near the tower on the maintenance line, and further solving the technical problem of the risk of electric shock near the tower on the maintenance line caused by the whole section maintenance of the common grounding electrode line in the related art.

[0040] As an optional embodiment, the predetermined working condition is that the target grounding electrode line is in a maintenance working condition, and the lines other than the target direct current transmission line in the multiple direct current transmission lines are in a direct current monopole ground operation working condition.

[0041] Alternatively, the predetermined maintenance working condition can be that the target grounding electrode line is in a power-off maintenance state among the multiple grounding electrode lines connected with the common grounding electrode, and another grounding electrode line other than the target direct current transmission line in the multiple direct current transmission lines is in a single-machine ground operation state.

[0042] As an optional embodiment, according to the simulation model, the power data of the target grounding electrode line under the predetermined working condition can be determined through the following steps: according to the simulation model, the first conductor potential of each of the multiple towers included in the target grounding electrode line under the predetermined working condition is determined, and the first ground potential of each of the multiple towers is determined; the difference between the first conductor potential and the first ground potential corresponding to each of the multiple towers is determined as the first potential difference corresponding to each of the multiple towers, wherein the power data includes the first potential difference.

[0043] Alternatively, the power data can include potential data of the target grounding electrode line, the potential on the target grounding electrode line relative to the potential value of the point at infinity can be calculated, the potential value of the ground potential at the position of the target grounding electrode line relative to the potential value of the point at infinity can also be calculated, the difference between the potential on the target grounding electrode line and the corresponding ground potential is calculated as the first potential difference, whether the maintenance personnel has the risk of electric shock during the maintenance of the target grounding electrode line is determined according to the first potential difference, and how to segment the target grounding electrode line is determined according to the first potential difference.

[0044] It should be noted that, since in the actual power system, the line needs to be supported by the tower, when calculating the potential on the target grounding electrode line, a plurality of towers on the target grounding electrode line can be taken as calculation points to calculate the first conductor potential of each of the plurality of towers included in the target grounding electrode line, that is, the potential of the target grounding electrode line at the tower, and then the first ground potential at the position of each of the plurality of towers can be calculated, and finally the difference between the first conductor potential and the first ground potential is determined as the first potential difference corresponding to each of the plurality of towers. Since the maintenance personnel may need to climb the tower during maintenance, it is possible that the body simultaneously contacts the conductor on the tower and the ground at the position of the tower, and if there is a large potential difference between the conductor on the tower and the ground at the position of the tower, a large voltage will be generated on the body of the maintenance personnel, resulting in electric shock of the maintenance personnel.

[0045] As an optional embodiment, according to the power data, the target grounding electrode line is divided into a plurality of line sections, which can be achieved by the following steps: marking the tower corresponding to the first potential difference exceeding the first threshold value as a dangerous tower; determining the tower closest to the dangerous tower and having a strain tower type as a target tower; and dividing the target grounding electrode line into a plurality of line sections according to the target tower.

[0046] Optionally, the human body can withstand a certain limit of voltage, and when the voltage on the human body exceeds the human body's bearing range, it will cause harm to the human body. The first threshold value can be the safe voltage that the human body can withstand, and when the first potential difference corresponding to some towers exceeds the safe voltage that the human body can withstand, the line corresponding to these towers needs to be processed, otherwise it will bring a greater risk of electric shock to the maintenance personnel during maintenance. The tower corresponding to the first potential difference exceeding the first threshold value can be marked as a dangerous tower according to the first potential difference, and the target grounding electrode line can be segmented according to the position of the dangerous tower.

[0047] It should be noted that, since the types of towers supporting the line in the actual power system are different, some towers are strain towers that play a more important supporting role, and the internal circuit structure can make the target grounding electrode line disconnected at this point; some towers only support the line to make the line away from the ground, and the internal circuit structure cannot make the target grounding electrode line disconnected at this point. Therefore, the strain tower closest to the dangerous tower can be taken as a target tower near the dangerous tower, and the target grounding electrode line is divided into a plurality of line sections from the target tower.

[0048] Optionally, a plurality of strain towers in which the target grounding electrode line can be segmented can also be determined, and then a plurality of segmentation schemes for the target grounding electrode line are determined, and then the target grounding electrode line is simulated in turn at the plurality of strain towers, and the target grounding electrode line is segmented into different multi-section lines in different segmentation schemes, and the power data corresponding to different schemes can be determined according to the power data corresponding to different schemes to determine the best segmentation scheme. Specifically, it can be determined that there are 10 strain towers in the target grounding electrode line, and the target grounding electrode line can be segmented into two sections by taking the 10 strain towers as segmentation points, respectively. Then, the potential difference between the line potential and the ground potential corresponding to the plurality of towers on the target grounding electrode line after the target grounding electrode line is segmented into two sections by taking the 10 strain towers as segmentation points can be simulated respectively, and the scheme with the highest safety level in the plurality of schemes can be selected as the implementation scheme according to the potential difference.

[0049] As an optional embodiment, according to the target tower, the target grounding electrode line can be segmented into a plurality of sections by the following steps: generating an instruction to disconnect the common pole address knife switch in the target tower, and the target grounding electrode line is segmented into a plurality of sections.

[0050] Optionally, after analyzing the power data obtained by simulation, it is determined that the target grounding electrode line can be segmented into a plurality of sections at the position of the target tower, at which time an instruction can be sent to the target tower to make the common pole address knife switch in the target tower disconnect, and the target grounding electrode line is segmented into a plurality of sections, and then the plurality of sections can be repaired respectively.

[0051] As an optional embodiment, the plurality of sections can be repaired respectively by the following steps: according to the simulation model, the second conductor potential corresponding to each of the plurality of towers included in the plurality of sections under the predetermined working condition and the second ground potential corresponding to each of the plurality of towers are determined; the difference between the second conductor potential corresponding to each of the plurality of towers and the second ground potential corresponding to each of the plurality of towers is determined as the second potential difference corresponding to each of the plurality of towers; and the repair mode of the tower corresponding to the second potential difference exceeding the second threshold value is live repair.

[0052] Optionally, after determining the segmentation repair scheme, the running condition of the plurality of sections under the predetermined working condition can also be simulated, the second conductor potential on the line corresponding to each of the plurality of towers included in the plurality of sections and the second ground potential at the position of each of the plurality of towers can be determined, and then the difference between the second conductor potential corresponding to each of the plurality of towers and the second ground potential corresponding to each of the plurality of towers is determined as the second potential difference corresponding to each of the plurality of towers. If the second potential difference still has a large potential difference exceeding the second threshold value, the second potential difference can be repaired by live repair to improve the safety of the repair personnel.

[0053] It should be noted that, compared with the conventional maintenance operation, the live maintenance safety may be higher, but the operation efficiency is lower, so in the case where the conditions allow, the grounding pole line maintenance is preferably avoided to use the live maintenance mode for operation.

[0054] As an optional embodiment, the simulation model including the DC power transmission common grounding pole system and the target DC power transmission line can be realized by the following steps: obtaining the engineering parameters and the power parameters of the DC power transmission common grounding pole system, the engineering parameters and the power parameters of the target DC power transmission line, and the connection relationship of the DC power transmission common grounding pole system and the target DC power transmission line; establishing the simulation model of the DC power transmission common grounding pole system according to the engineering parameters and the power parameters of the DC power transmission common grounding pole system; establishing the simulation model of the target DC power transmission line according to the engineering parameters and the power parameters of the target DC power transmission line; and establishing the simulation model including the DC power transmission common grounding pole system and the target DC power transmission line according to the connection relationship of the DC power transmission common grounding pole system and the target DC power transmission line.

[0055] Optionally, the DC common grounding pole system can include the grounding pole line and the grounding pole, wherein the engineering parameters of the grounding pole can include the design condition of the grounding pole, the soil condition near the grounding pole, etc., the engineering parameters of the grounding pole line can include the design size of the tower, the length of the grounding pole line, the design condition of the grounding net of the converter station, etc., and the power parameters of the DC power transmission common grounding pole system can be the resistance of the conductor, etc.; the engineering parameters of the target DC power transmission line can include the conductor length and the tower design size of the target DC power transmission line, etc.; and the power parameters of the target DC power transmission line can be the conductor resistance of the target DC power transmission system, etc.

[0056] As a specific embodiment, the A grounding pole is the common grounding pole of the ±500kV B DC power transmission project and the ±800kV C DC power transmission project, the design scheme of the grounding pole can be obtained to establish the simulation model of the grounding pole; the A DC common grounding pole system includes the B grounding pole line and the C grounding pole line, the B grounding pole line of the ±500kV B DC power transmission project starts from the D converter station framework and ends at the A grounding pole line framework, the full line length is 189.2km, the C grounding pole line of the ±800kV C DC power transmission project starts from the E converter station framework and ends at the A grounding pole line framework, the full line length is 94.2km, and the B grounding pole line and the C grounding pole line converge at the A common grounding pole center tower.

[0057] The current of the A grounding electrode is 3125 A, and the soil model is the soil structure of the A grounding electrode. A simulation model is established by using software. Observation points are added at the grounding electrode tower to calculate the contact potential of the observation points (towers). The zero potential at infinity is taken as the reference point. The conductor of the grounding electrode line is the first segment, and the grounding electrode line of the C converter station is the last segment, with a total of 447 segments. The corresponding observation points (towers) are the first point and the last point, with a total of 448 points. The grounding electrode line also has 448 end points. When the grounding knife switch of the grounding electrode line in the converter station is not disconnected, the grounding electrode line of the converter station is connected to the grounding electrode line. The potential of the grounding electrode line after the permanent grounding line is hung, the ground potential of the observation point, and the potential difference between the two are calculated.

[0058] During the maintenance of the grounding electrode line, if safety measures are not taken, a person may stand on the tower and come into contact with the grounding electrode line conductor, bearing the potential difference between the tower and the grounding electrode line. The potential difference first increases, then gradually decreases, then gradually increases, and then gradually decreases, with a maximum of about 219.19 V (446# tower). At the 447# tower segment of the insulated overhead ground line, the contact potential of the tower is about 5.80 V, which is much lower than the 35 V limit specified in the GB / T 3805-2008 extra-low voltage (ELV) limit. The potential difference between the grounding electrode line and the tower of the 445-430# and 428# towers exceeds 35 V, and safety measures need to be taken. In the 429# and 427-002# tower segments erected on the same tower, the potential difference between the grounding electrode line and the tower of the 429-407# tower is lower than 35 V, and the potential difference between the grounding electrode line and the tower of the 405-58# tower exceeds 35 V, and safety measures need to be taken. The potential difference between the grounding electrode line and the tower of the 57-2# tower is lower than 35 V.

[0059] For the B grounding electrode line within 10 km of the A grounding electrode, the 447#, 442#, 431#, and 430# towers are strain towers, and can be maintained in sections. If the maintenance is carried out from the 447# tower, the transfer potential difference between the grounding electrode line and the tower at the 447#-433# and 398#-97# towers is greater than 50 V, and the transfer potential difference between the grounding electrode line and the tower at the 432#-399# and 96#-1# towers is less than 50 V. According to the calculation, the direct current flowing through the grounding down conductor of the 447# tower is about 83.68 A. The transfer potential difference between the grounding electrode line and the tower at different strain towers is less than 50 V, as shown in Table 1.

[0060] Table 1 Transfer potential difference between grounding electrode line and tower at different strain towers during sectional maintenance

[0061]

[0062]

[0063] Note: * indicates the segmented maintenance at 430# pole tower, and the pole tower DC line is connected with the ground wire at 429.

[0064] When the segmented maintenance is performed at the strain tower 430#, the pole tower with a transfer potential difference between the ground electrode line and the pole tower of no less than 50V can be maintained by the live working mode. It should be noted that, compared with the conventional maintenance operation, the live working mode maintenance has higher safety, but the operation efficiency is lower, so the ground electrode line maintenance avoids the live working mode maintenance as much as possible under the condition.

[0065] It should be noted that, for the foregoing method embodiments, in order to simply describe, they are all expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the action sequence described, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification all belong to preferred embodiments, and the actions and modules involved are not necessarily necessary for the present application.

[0066] Through the description of the above embodiments, those skilled in the art can clearly understand that the DC power transmission common ground electrode system maintenance method according to the above embodiments can be realized by means of software and the necessary general hardware platform, of course, it can also be realized by hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a plurality of instructions for making a terminal device (which can be a mobile phone, computer, server, or network device, etc.) execute the method described in each embodiment of the present application.

[0067] According to the embodiment of the present application, a DC power transmission common ground electrode system maintenance device for implementing the above DC power transmission common ground electrode system maintenance method is also provided, Figure 3 The structure block diagram of the DC power transmission common ground electrode system maintenance device provided by the embodiment of the present application is shown in Figure 3 The DC power transmission common ground electrode system maintenance device includes a simulation module 32, a determination module 34, a segmentation module 36 and a maintenance module 38, which will be described below.

[0068] The simulation module 32 is configured to establish a simulation model including a DC power transmission common grounding electrode system and a target DC power transmission line, wherein the DC power transmission common grounding electrode system includes a plurality of grounding electrode lines and a common grounding electrode, and the plurality of grounding electrode lines are configured to connect a plurality of DC power transmission lines to the common grounding electrode, and the plurality of DC power transmission lines include the target DC power transmission line.

[0069] The determination module 34 is connected to the simulation module 32 and configured to determine power data of a target grounding electrode line corresponding to the target DC power transmission line under a predetermined working condition according to the simulation model.

[0070] The segmentation module 36 is connected to the determination module 34 and configured to segment the target grounding electrode line into a plurality of segments according to the power data.

[0071] The maintenance module 38 is connected to the segmentation module 36 and configured to perform maintenance on the plurality of segments respectively.

[0072] It should be noted that the simulation module 32, the determination module 34, the segmentation module 36 and the maintenance module 38 correspond to steps S202 to S208 in the embodiment, and the plurality of modules have the same instances and application scenarios as the corresponding steps, but are not limited to the content disclosed in the above embodiment. It should be noted that the above modules can be run in the computer terminal 10 provided in the embodiment as a part of the device.

[0073] The embodiment of the present application can provide a computer device. Optionally, in the embodiment, the computer device can be located in at least one network device of a plurality of network devices in a computer network. The computer device includes a memory and a processor.

[0074] The memory can be used to store software programs and modules, such as program instructions / modules corresponding to the DC power transmission common grounding electrode system maintenance method and device in the embodiment of the present application. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory, that is, the DC power transmission common grounding electrode system maintenance method is implemented. The memory can include a high-speed random access memory, and can further include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some examples, the memory can further include a memory remotely arranged with respect to the processor, and the remote memory can be connected to the computer terminal through a network. Examples of the network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0075] The processor can call information and application programs stored in the memory through the transmission device to perform the following steps: establishing a simulation model comprising a common grounding electrode system of direct current transmission and a target direct current transmission line, wherein the common grounding electrode system of direct current transmission comprises a plurality of grounding electrode lines and a common grounding electrode, the plurality of grounding electrode lines are used to connect a plurality of corresponding direct current transmission lines to the common grounding electrode, and the plurality of direct current transmission lines comprise the target direct current transmission line; determining power data of a target grounding electrode line corresponding to the target direct current transmission line under a predetermined working condition according to the simulation model; and dividing the target grounding electrode line into a plurality of line sections according to the power data, and respectively maintaining the plurality of line sections.

[0076] Optionally, the processor can further execute program codes of the following steps: determining the power data of the target grounding electrode line under the predetermined working condition according to the simulation model, comprising: determining a plurality of respective first conductor potentials of a plurality of towers included in the target grounding electrode line and a plurality of respective first ground potentials of the plurality of towers under the predetermined working condition according to the simulation model; and respectively determining a plurality of respective first potential differences of the plurality of towers corresponding to the plurality of respective first conductor potentials and the plurality of respective first ground potentials, wherein the power data comprises the plurality of respective first potential differences.

[0077] Optionally, the processor can further execute program codes of the following steps: dividing the target grounding electrode line into a plurality of line sections according to the power data, comprising: marking a tower corresponding to a first potential difference exceeding a first threshold value as a dangerous tower; determining a tower closest to the dangerous tower and having a type of strain tower as a target tower; and dividing the target grounding electrode line into a plurality of line sections according to the target tower.

[0078] Optionally, the processor can further execute program codes of the following steps: dividing the target grounding electrode line into a plurality of line sections according to the target tower, comprising: generating an instruction to disconnect a common pole switch in the target tower, and dividing the target grounding electrode line into a plurality of line sections.

[0079] Optionally, the processor can further execute program codes of the following steps: respectively maintaining the plurality of line sections, comprising: determining a plurality of respective second conductor potentials of a plurality of towers included in the plurality of line sections and a plurality of respective second ground potentials of the plurality of towers under the predetermined working condition according to the simulation model; respectively determining a plurality of respective second potential differences of the plurality of towers corresponding to the plurality of respective second conductor potentials and the plurality of respective second ground potentials; and determining a maintenance mode of a tower corresponding to a second potential difference exceeding a second threshold value as live maintenance.

[0080] Optionally, the processor can further execute program codes of the following steps: establishing the simulation model comprising the HVDC common grounding electrode system and the target HVDC line, including: obtaining the engineering parameters and the power parameters of the HVDC common grounding electrode system, the engineering parameters and the power parameters of the target HVDC line, and the connection relationship between the HVDC common grounding electrode system and the target HVDC line; establishing the simulation model of the HVDC common grounding electrode system according to the engineering parameters and the power parameters of the HVDC common grounding electrode system; establishing the simulation model of the target HVDC line according to the engineering parameters and the power parameters of the target HVDC line; and establishing the simulation model comprising the HVDC common grounding electrode system and the target HVDC line according to the connection relationship between the HVDC common grounding electrode system and the target HVDC line.

[0081] Optionally, the processor can further execute program codes of the following steps: the predetermined working condition is that the target grounding electrode line is in a maintenance working condition, and the lines other than the target HVDC line in the plurality of HVDC lines are in a monopole ground operation working condition.

[0082] By adopting the embodiment of the present application, a scheme for HVDC common grounding electrode system maintenance is provided. In the embodiment of the present application, the target grounding electrode line is divided into a plurality of line sections for maintenance, a simulation model comprising the HVDC common grounding electrode system and the target HVDC line is established, the HVDC common grounding electrode system comprises a plurality of grounding electrode lines and a common grounding electrode, the plurality of grounding electrode lines are used to connect a plurality of corresponding HVDC lines to the common grounding electrode, and the plurality of HVDC lines comprise a target HVDC line; power data of the target grounding electrode line corresponding to the target HVDC line in a predetermined working condition is determined according to the simulation model; the target grounding electrode line is divided into a plurality of line sections according to the power data; and the plurality of line sections are maintained respectively, so as to reduce the potential difference between the ground potential near the tower on the maintenance line and the line potential, thereby realizing the technical effect of reducing the risk of electric shock near the tower on the maintenance line, and further solving the technical problem of the risk of electric shock near the tower on the maintenance line caused by the maintenance of the common grounding electrode line in the related art.

[0083] Those skilled in the art can understand that all or part of the steps in the above-mentioned various methods of the embodiments can be completed by instructing the hardware related to the terminal device through programs, and the programs can be stored in a non-volatile storage medium, which can include a flash disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0084] The embodiment of the present application also provides a non-volatile storage medium. Optionally, in the embodiment, the non-volatile storage medium can be used to save the program code executed by the HVDC common grounding electrode system maintenance method provided by the above embodiment.

[0085] Optionally, in the embodiment, the non-volatile storage medium can be located in any one of the computer terminals in the computer terminal group in the computer network, or in any one of the mobile terminals in the mobile terminal group.

[0086] Optionally, in the embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: establishing a simulation model comprising a HVDC common grounding electrode system and a target HVDC line, wherein the HVDC common grounding electrode system comprises a plurality of grounding electrode lines and a common grounding electrode, the plurality of grounding electrode lines are used to connect a plurality of corresponding HVDC lines to the common grounding electrode, and the plurality of HVDC lines comprises the target HVDC line; determining, according to the simulation model, power data of a target grounding electrode line corresponding to the target HVDC line under a predetermined working condition; dividing, according to the power data, the target grounding electrode line into a plurality of line sections; and performing maintenance on the plurality of line sections respectively.

[0087] Optionally, in the embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: determining, according to the simulation model, the power data of the target grounding electrode line under the predetermined working condition, comprising: determining, according to the simulation model, a plurality of first conductor potentials of a plurality of towers included in the target grounding electrode line under the predetermined working condition, and a plurality of first ground potentials of the plurality of towers respectively; and determining a plurality of first potential differences corresponding to the plurality of first conductor potentials and the plurality of first ground potentials respectively, wherein the power data comprises the plurality of first potential differences.

[0088] Optionally, in the embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: dividing, according to the power data, the target grounding electrode line into a plurality of line sections, comprising: marking a tower corresponding to a first potential difference exceeding a first threshold as a dangerous tower; determining a tower closest to the dangerous tower and having a type of strain tower as a target tower; and dividing, according to the target tower, the target grounding electrode line into a plurality of line sections.

[0089] Optionally, in the embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: dividing, according to the target tower, the target grounding electrode line into a plurality of line sections, comprising: generating an instruction for disconnecting a common pole switch in the target tower, and dividing the target grounding electrode line into a plurality of line sections.

[0090] Optionally, in the embodiment, the nonvolatile storage medium is configured to store program code for performing the following steps: performing maintenance on the plurality of line sections respectively, comprising: determining, according to the simulation model, the second conductor potential corresponding to each of the plurality of towers included in the plurality of line sections under the predetermined working condition, and the second ground potential corresponding to each of the plurality of towers; determining the second potential difference corresponding to each of the plurality of towers respectively as the difference between the second conductor potential and the second ground potential corresponding to each of the plurality of towers; and determining the maintenance mode of the tower corresponding to the second potential difference exceeding the second threshold value as live maintenance.

[0091] Optionally, in the embodiment, the nonvolatile storage medium is configured to store program code for performing the following steps: establishing a simulation model including the DC power transmission common grounding electrode system and the target DC power transmission line, comprising: obtaining the engineering parameters and the power parameters of the DC power transmission common grounding electrode system, the engineering parameters and the power parameters of the target DC power transmission line, and the connection relationship between the DC power transmission common grounding electrode system and the target DC power transmission line; establishing a simulation model of the DC power transmission common grounding electrode system according to the engineering parameters and the power parameters of the DC power transmission common grounding electrode system; establishing a simulation model of the target DC power transmission line according to the engineering parameters and the power parameters of the target DC power transmission line; and establishing a simulation model including the DC power transmission common grounding electrode system and the target DC power transmission line according to the connection relationship between the DC power transmission common grounding electrode system and the target DC power transmission line.

[0092] Optionally, in the embodiment, the nonvolatile storage medium is configured to store program code for performing the following steps: the predetermined working condition is that the target grounding electrode line is in a maintenance working condition, and the lines other than the target DC power transmission line in the plurality of DC power transmission lines are in a DC monopole ground operation working condition.

[0093] The above-mentioned serial numbers of the embodiments of the application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0094] In the above-mentioned embodiments of the application, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0095] In several embodiments provided in the present application, it should be understood that the disclosed technical contents can be implemented by other ways. Among them, the above-mentioned device embodiments are only schematic, for example, the division of the units can be a logical function division, and in actual implementation, there can be another division way, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units or modules shown or discussed can be indirect coupling or communication connection through some interfaces, and can be electrical or other forms.

[0096] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0097] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0098] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a non-volatile storage medium. Based on this understanding, the technical solutions of the present application, essentially or the part that contributes to the prior art, or all or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions to make a computer device (which can be a personal computer, a server or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application. The foregoing storage medium includes: a U disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a mobile hard disk, a magnetic disk or an optical disk, and various program code storage media.

[0099] The above is only the preferred embodiment of the present application, it should be noted that for those skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A method of maintenance of a DC power transmission common grounding electrode system, characterized in that The method comprises the steps of: establishing a simulation model comprising a common grounding electrode system of direct current transmission and a target direct current transmission line, wherein the common grounding electrode system of direct current transmission comprises a plurality of grounding electrode lines and a common grounding electrode, and the plurality of grounding electrode lines are used to connect a plurality of corresponding direct current transmission lines to the common grounding electrode, and the plurality of direct current transmission lines comprise the target direct current transmission line; determining, according to the simulation model, power data of a target grounding electrode line corresponding to the target direct current transmission line under a predetermined working condition; dividing the target grounding electrode line into a plurality of line sections according to the power data; respectively maintaining the plurality of line sections; wherein the step of determining, according to the simulation model, the power data of the target grounding electrode line corresponding to the target direct current transmission line under the predetermined working condition comprises the steps of: determining, according to the simulation model, a plurality of first conductor potentials of a plurality of towers included in the target grounding electrode line under the predetermined working condition, and a plurality of first ground potentials of the plurality of towers; and determining, respectively, a plurality of first potential differences corresponding to the plurality of towers as the plurality of first potential differences corresponding to the plurality of towers, respectively, wherein the power data comprises the plurality of first potential differences; wherein the step of dividing the target grounding electrode line into a plurality of line sections according to the power data comprises the steps of: marking a tower corresponding to a first potential difference exceeding a first threshold value as a dangerous tower; determining a tower closest to the dangerous tower and having a type of strain tower as a target tower; determining a plurality of segmentation schemes of the target grounding electrode line according to the target tower, and a plurality of power data corresponding to the plurality of segmentation schemes, respectively; and determining a target segmentation scheme for dividing the target grounding electrode line into a plurality of line sections.

2. The method of claim 1, wherein, The step of dividing the target grounding electrode line into a plurality of line sections according to the target tower comprises: generating an instruction for disconnecting a common pole switch in the target tower to divide the target grounding electrode line into the plurality of line sections.

3. The method of claim 1, wherein, The step of respectively maintaining the plurality of line sections comprises: determining, according to the simulation model, a plurality of second conductor potentials of a plurality of towers included in the plurality of line sections under the predetermined working condition, and a plurality of second ground potentials of the plurality of towers; determining, respectively, a plurality of second potential differences corresponding to the plurality of towers as the plurality of second potential differences corresponding to the plurality of towers, respectively; determining a maintenance mode of a tower corresponding to a second potential difference exceeding a second threshold value as live-line maintenance.

4. The method of claim 1, wherein, The step of establishing a simulation model comprising a common grounding electrode system of direct current transmission and a target direct current transmission line comprises: obtaining engineering parameters and power parameters of the common grounding electrode system of direct current transmission, engineering parameters and power parameters of the target direct current transmission line, and a connection relationship between the common grounding electrode system of direct current transmission and the target direct current transmission line; establishing a simulation model of the common grounding electrode system of direct current transmission according to the engineering parameters and the power parameters of the common grounding electrode system of direct current transmission; establishing a simulation model of the target direct current transmission line according to the engineering parameters and the power parameters of the target direct current transmission line; According to a connection relationship between the DC power transmission common grounding electrode system and the target DC power transmission line, a simulation model including the DC power transmission common grounding electrode system and the target DC power transmission line is established.

5. The method according to any one of claims 1 to 4, characterized in that, The predetermined working condition is that the target grounding electrode line is in a maintenance working condition, and lines other than the target DC power transmission line in the plurality of DC power transmission lines are in a DC monopole ground operation working condition.

6. A DC power transmission common grounding electrode system maintenance device characterized by comprising: Comprise: A simulation module is configured to establish a simulation model including a DC power transmission common grounding electrode system and a target DC power transmission line, wherein the DC power transmission common grounding electrode system comprises a plurality of grounding electrode lines and a common grounding electrode, and the plurality of grounding electrode lines are configured to connect a corresponding plurality of DC power transmission lines to the common grounding electrode, and the plurality of DC power transmission lines include the target DC power transmission line. A determination module is configured to determine, according to the simulation model, power data of a target grounding electrode line corresponding to the target DC power transmission line in a predetermined working condition. A segmentation module is configured to segment the target grounding electrode line into a plurality of line segments according to the power data. A maintenance module is configured to maintain the plurality of line segments respectively. The determination module is further configured to determine, according to the simulation model, a plurality of first conductor potentials of a plurality of towers included in the target grounding electrode line in the predetermined working condition, and a plurality of first ground potentials of the plurality of towers respectively, and determine a plurality of first potential differences corresponding to the plurality of towers respectively, wherein the power data includes the plurality of first potential differences. The segmentation module is further configured to mark a tower corresponding to a first potential difference exceeding a first threshold as a dangerous tower, determine a target tower closest to the dangerous tower and having a strain tower type, determine a plurality of segmentation schemes of the target grounding electrode line according to the target tower, and determine a target segmentation scheme to segment the target grounding electrode line into a plurality of line segments according to the power data corresponding to the plurality of segmentation schemes respectively.

7. A non-volatile storage medium, characterized by The non-volatile storage medium includes a stored program, wherein the program controls the device in which the non-volatile storage medium is located to perform the DC power transmission common grounding electrode system maintenance method of any one of claims 1 to 5 when the program is running.

8. A computer device, comprising: Comprise: A memory and a processor, The memory stores a computer program; The processor is configured to execute the computer program stored in the memory, and the computer program makes the processor execute the DC power transmission common grounding electrode system maintenance method of any one of claims 1 to 5 when running.

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