CN116305999A - Maintenance method and device for direct-current transmission common grounding electrode system and computer equipment - Google Patents

Abstract

The invention discloses a maintenance method, a device and computer equipment for a direct-current transmission common grounding electrode system. Wherein the method comprises the following steps: establishing a simulation model comprising a direct-current transmission common grounding electrode system and a target direct-current transmission line, wherein the direct-current transmission common grounding electrode system comprises: the system comprises a plurality of grounding electrode lines and a common grounding electrode, wherein the plurality of grounding electrode lines are used for connecting a plurality of corresponding direct current transmission lines to the common grounding electrode, and the plurality of direct current transmission lines comprise target direct current transmission lines; determining electric power data of a target grounding electrode line corresponding to the target direct-current transmission line under a preset working condition according to the simulation model; dividing the target grounding electrode circuit into a plurality of sections of circuits according to the electric power data; and overhauling the multi-section lines respectively. The invention solves the technical problem that the electric shock risk exists near the pole tower on the overhaul line caused by the whole section overhaul of the common grounding electrode line in the related art.

Description

Maintenance method and device for direct-current transmission common grounding electrode system and computer equipment

Technical Field

The invention relates to the technical field of power system overhaul, in particular to a method and a device for overhauling a direct-current transmission common grounding electrode system and computer equipment.

Background

High Voltage Direct Current (HVDC) transmission lines operate in bipolar operation in normal operation, with direct current (dc) transmission lines forming a loop through the transmission lines of both poles. But in case of system commissioning or failure, a monopolar earth-loop mode of operation will be used. The DC grounding electrode is an important facility in DC transmission engineering, and is used for respectively carrying out heavy duty of leading-in ground current and unbalanced current in a monopolar earth return operation mode and a bipolar operation mode, and also has the function of restricting the neutral point potential of the converter valve during normal bipolar operation, so that the safety of the converter valve is protected. In recent years, the ground current of the established direct current transmission project in China is larger and larger, and the occupied area of the grounding electrode is larger and larger. In addition, as the number of grounding poles of the direct current transmission project is increased, the number of the grounding poles suitable for building the grounding poles is reduced, and a plurality of direct current transmission systems run by adopting one grounding pole, so that the occupied area can be greatly reduced, and the project investment is reduced.

The common grounding electrode address can enable the running mode of the direct current transmission system of the common grounding electrode address to be more flexible, improve the running reliability of the direct current system, reduce the number of grounding electrode addresses and improve the utilization efficiency of the grounding electrode. In addition, when the multi-direct-current system operates in a mode of using the common grounding electrode as the heteropolar monopole earth reflux, the current flowing into the grounding electrode is the difference between the currents of the two direct-current systems, so that the influence on an alternating-current power system and other influences on the environment are eliminated or slowed down, the loss of electric energy on a circuit can be reduced, and obvious economic benefit and social benefit are achieved.

The common ground electrode also brings new problems in the field of ground electrode line maintenance. When one circuit fails, the other circuit runs in the monopolar earth, the incoming current can generate higher ground potential near the polar address, and the personal safety of line maintenance personnel is threatened.

In view of the above problems, no effective solution has been proposed at present.

Disclosure of Invention

The embodiment of the invention provides a method, a device and computer equipment for overhauling a direct-current transmission common grounding electrode system, which at least solve the technical problem that the electric shock risk exists near a pole and a tower on an overhauling line caused by overhauling the whole section of the common grounding electrode line in the related technology.

According to an aspect of the embodiment of the invention, there is provided a maintenance method for a direct current transmission common grounding electrode system, including: establishing a simulation model comprising a direct-current transmission common grounding electrode system and a target direct-current transmission line, wherein the direct-current transmission common grounding electrode system comprises: the system comprises a plurality of grounding electrode lines and a common grounding electrode, wherein the plurality of grounding electrode lines are used for connecting a plurality of corresponding direct current transmission lines to the common grounding electrode, and the plurality of direct current transmission lines comprise target direct current transmission lines; determining electric power data of a target grounding electrode line corresponding to the target direct-current transmission line under a preset working condition according to the simulation model; dividing the target grounding electrode circuit into a plurality of sections of circuits according to the electric power data; and overhauling the multi-section lines respectively.

Optionally, determining, according to the simulation model, power data of a target grounding electrode line corresponding to the target direct current power transmission line under a predetermined working condition, including: according to the simulation model, determining first wire potentials of each of a plurality of towers included in a target grounding electrode line under a preset working condition and first ground potentials of each of the towers; the difference between the first wire potential and the first ground potential of each of the plurality of towers is determined to be a first potential difference of each of the plurality of towers, wherein the power data includes the first potential difference.

Optionally, the target earth electrode line is divided into a plurality of lines according to the power data, including: marking a tower corresponding to the first potential difference exceeding a first threshold as a dangerous tower; determining a tower closest to the dangerous tower and the tower type of which is a tension tower as a target tower; and dividing the target grounding electrode line into a plurality of sections of lines according to the target tower.

Optionally, the target grounding electrode line is divided into a plurality of sections according to the target tower, including: and generating an instruction for opening the common-electrode-address disconnecting link in the target tower, and dividing the target grounding electrode line into a plurality of sections of lines.

Optionally, overhauling the multi-section line respectively includes: according to the simulation model, determining second conductor potentials corresponding to the towers respectively and the second ground potentials corresponding to the towers respectively, wherein the towers are included in the multi-section line under the preset working condition; determining that differences between the second wire potentials and the second ground potentials corresponding to the towers are second potential differences corresponding to the towers respectively; and determining that the overhaul mode of the tower corresponding to the second potential difference exceeding the second threshold value is electrified overhaul.

Optionally, establishing a simulation model including the direct-current transmission common grounding electrode system and the target direct-current transmission line includes: acquiring engineering parameters and power parameters of a direct-current transmission common grounding electrode system, engineering parameters and power parameters of a target direct-current transmission line, and a connection relationship between the direct-current transmission common grounding electrode system and the target direct-current transmission line; establishing a simulation model of the direct-current transmission common grounding electrode system according to engineering parameters and power parameters of the direct-current transmission common grounding electrode system; establishing a simulation model of the target direct current transmission line according to engineering parameters and power parameters of the target direct current transmission line; and establishing a simulation model comprising the direct-current transmission common grounding electrode system and the target direct-current transmission line according to the connection relation between the direct-current transmission common grounding electrode system and the target direct-current transmission line.

Optionally, the predetermined working condition is that the target grounding electrode line is an overhaul working condition, and the lines except the target direct current transmission line in the plurality of direct current transmission lines are direct current monopole earth operation working conditions.

According to another aspect of the embodiment of the present invention, there is also provided a maintenance device for a dc power transmission common ground electrode system, including: the simulation module is used for establishing a simulation model comprising a direct-current transmission common grounding electrode system and a target direct-current transmission line, wherein the direct-current transmission common grounding electrode system comprises: the system comprises a plurality of grounding electrode lines and a common grounding electrode, wherein the plurality of grounding electrode lines are used for connecting a plurality of corresponding direct current transmission lines to the common grounding electrode, and the plurality of direct current transmission lines comprise target direct current transmission lines; the determining module is used for determining the power data of the target grounding electrode line corresponding to the target direct-current power transmission line under the preset working condition according to the simulation model; the segmentation module is used for dividing the target grounding electrode circuit into a plurality of sections of circuits according to the electric power data; and the overhaul module is used for overhauling the multi-section lines respectively.

According to still another aspect of the embodiment of the present invention, there is further provided a nonvolatile storage medium, where the nonvolatile storage medium includes a stored program, and when the program runs, the apparatus where the nonvolatile storage medium is controlled to execute any one of the foregoing methods for repairing the dc power transmission common ground electrode system.

According to still another aspect of the embodiment of the present invention, there is further provided a computer device, where the computer device includes a processor, and the processor is configured to run a program, and when the program runs, execute any one of the foregoing methods for overhauling a dc power transmission common ground electrode system.

In the embodiment of the invention, a mode of dividing a target grounding electrode line into a plurality of sections of lines for overhauling is adopted, and a simulation model comprising a direct-current transmission common grounding electrode system and the target direct-current transmission line is established, wherein the direct-current transmission common grounding electrode system comprises: the system comprises a plurality of grounding electrode lines and a common grounding electrode, wherein the plurality of grounding electrode lines are used for connecting a plurality of corresponding direct current transmission lines to the common grounding electrode, and the plurality of direct current transmission lines comprise target direct current transmission lines; determining electric power data of a target grounding electrode line corresponding to the target direct-current transmission line under a preset working condition according to the simulation model; dividing the target grounding electrode circuit into a plurality of sections of circuits according to the electric power data; the multi-section line is overhauled respectively, the purpose of reducing the potential difference between the ground potential and the line potential near the pole tower on the overhauling line is achieved, the technical effect of reducing the electric shock risk near the pole tower on the overhauling line is achieved, and the technical problem that the electric shock risk exists near the pole tower on the overhauling line due to the fact that the whole section of the grounding electrode line is overhauled in the related technology is solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:

FIG. 1 shows a block diagram of the hardware architecture of a computer terminal for implementing a method for servicing a DC power transmission common ground system;

fig. 2 is a schematic flow chart of a maintenance method of a direct current transmission common grounding electrode system according to an embodiment of the invention;

fig. 3 is a block diagram of a maintenance device for a dc power transmission common grounding electrode system according to an embodiment of the present invention.

Detailed Description

In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In accordance with an embodiment of the present invention, a method embodiment for servicing a direct current transmission common ground system is provided, it being noted that the steps illustrated in the flowchart of the figures may be performed in a computer system, such as a set of computer executable instructions, and, although a logical sequence is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in a different order than that illustrated herein.

The method embodiment provided in the first embodiment of the present application may be executed in a mobile terminal, a computer terminal or a similar computing device. Fig. 1 shows a hardware block diagram of a computer terminal for implementing a method for overhauling a dc transmission common ground system. As shown in fig. 1, the computer terminal 10 may include one or more (shown as 102a, 102b, … …,102 n) processors (which may include, but are not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data. In addition, the method may further include: a display, an input/output interface (I/O interface), a Universal Serial BUS (USB) port (which may be included as one of the ports of the BUS), a network interface, a power supply, and/or a camera. It will be appreciated by those of ordinary skill in the art that the configuration shown in fig. 1 is merely illustrative and is not intended to limit the configuration of the electronic device described above. For example, the computer terminal 10 may also include more or fewer components than shown in FIG. 1, or have a different configuration than shown in FIG. 1.

It should be noted that the one or more processors and/or other data processing circuits described above may be referred to herein generally as "data processing circuits. The data processing circuit may be embodied in whole or in part in software, hardware, firmware, or any other combination. Furthermore, the data processing circuitry may be a single stand-alone processing module or incorporated, in whole or in part, into any of the other elements in the computer terminal 10. As referred to in the embodiments of the present application, the data processing circuit acts as a processor control (e.g., selection of the path of the variable resistor termination to interface).

The memory 104 may be used to store software programs and modules of application software, such as a program instruction/data storage device corresponding to the method for overhauling a dc transmission common ground system in the embodiment of the present invention, and the processor executes various functional applications and data processing by running the software programs and modules stored in the memory 104, that is, implements the method for overhauling a dc transmission common ground system of the application program. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory located remotely from the processor, which may be connected to the computer terminal 10 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The display may be, for example, a touch screen type Liquid Crystal Display (LCD) that may enable a user to interact with a user interface of the computer terminal 10.

The use of a common ground electrode presents new problems in the field of ground electrode line repairs. When one circuit is in power failure and the other circuit runs on the earth, the incoming current can generate higher ground potential near the polar address, so that the personal safety of line maintenance personnel is threatened, and the method mainly comprises the following steps: (1) there is a risk of personal electric shock at the stride potential and the contact potential near the service tower. When the line overhauls and climbs the tower, a temporary grounding wire is hung or detached or personal security is ensured, and the electric shock safety risks of the stride potential and the contact potential exist; (2) personal security line current is at risk of exceeding standard. When an maintainer hangs and removes the grounding wire or the personal security wire, the direct current flowing through the temporary grounding wire and the personal security wire may be larger, and the risk of arc burn exists when the grounding wire or the personal security wire is hung and removed.

When the common grounding electrode line is overhauled in the related art, the influence of one of the DC single-pole earth operation on the other DC grounding electrode line is not considered, and the invention provides the sectional overhauling of the grounding electrode line, thereby effectively reducing the electric shock risk of overhaulers. Fig. 2 is a schematic flow chart of a method for overhauling a direct-current transmission common grounding electrode system, as shown in fig. 2, according to an embodiment of the invention, the method comprises the following steps:

step S202, a simulation model comprising a direct-current transmission common grounding electrode system and a target direct-current transmission line is established, wherein the direct-current transmission common grounding electrode system comprises: the system comprises a plurality of grounding electrode lines and a common grounding electrode, wherein the plurality of grounding electrode lines are used for connecting a plurality of corresponding direct current transmission lines to the common grounding electrode, and the plurality of direct current transmission lines comprise target direct current transmission lines.

The common grounding electrode refers to a grounding electrode which is shared when a plurality of direct current transmission lines are grounded, and the plurality of direct current transmission lines are respectively connected with the common grounding electrode through a plurality of grounding electrode lines, that is, each direct current transmission line is connected to the common grounding electrode through a grounding electrode line corresponding to the direct current transmission line. The two ends of the grounding electrode line are respectively a common grounding electrode and a convertor station of the direct current transmission line.

In this step, when the target earth electrode line in the direct current transmission common earth electrode system is overhauled, a simulation model can be built first, the target earth electrode line in an overhauling state is simulated, and how to overhaul the target earth electrode line can be determined according to a simulation result. It should be noted that, since the power condition on the target dc power line connected to the target grounding electrode line in the actual power system may also affect the target grounding electrode line, the simulation model includes the dc power transmission common grounding electrode system and the target dc power transmission line.

And step S204, determining the power data of the target grounding electrode line corresponding to the target direct current transmission line under the preset working condition according to the simulation model.

In this step, the power data of the target grounding electrode line under the predetermined working condition can be obtained through simulation according to the simulation model, the predetermined working condition can be the predetermined working condition of the direct current transmission common grounding electrode system and the target direct current transmission line when the target grounding electrode line is overhauled, and the overhauling work of the target grounding electrode line can be guided according to the analysis of the power data of the target grounding electrode line under the predetermined working condition.

In step S206, the target grounding electrode line is divided into multiple lines according to the power data.

And step S208, overhauling the multi-section lines respectively.

In this step, the target grounding electrode line may 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 may be overhauled. In the related art, the maintenance of the target grounding electrode line is generally that the whole line is maintained, and a large potential difference can be generated between the potential on the line and the ground potential during the maintenance, so that the safety of maintenance personnel is threatened. The invention can divide the target grounding electrode circuit into a plurality of sections of circuits, disconnect the circuit connection among the sections of circuits, and greatly reduce the potential on each section of circuit after the sections are segmented on the basis of the potential on the whole section of circuit, so that the potential difference between the potential on each section of circuit and the ground potential is smaller than the potential difference between the potential on the whole section of circuit and the ground potential when the sections of circuit are overhauled respectively, and the technical effect of reducing the electric shock risk of overhaulers can be realized.

Through the steps, the purpose of reducing the potential difference between the ground potential and the line potential near the pole tower on the overhaul line can be achieved, so that the technical effect of reducing the electric shock risk near the pole tower on the overhaul line is achieved, and the technical problem that the electric shock risk exists near the pole tower on the overhaul line due to the fact that the whole section of the common grounding electrode line is overhauled in the related art is solved.

As an alternative embodiment, the predetermined condition is that the target earth electrode line is an overhaul condition, and the lines other than the target direct current transmission line in the plurality of direct current transmission lines are direct current monopole earth operation conditions.

Optionally, the predetermined maintenance working condition may be that among a plurality of grounding electrode lines connected to the common grounding electrode, the target grounding electrode line is in a power failure maintenance state, and another grounding electrode return line in the plurality of direct current transmission lines except the target direct current transmission line is in a single-machine ground operation state.

As an alternative embodiment, determining the power data of the target grounding electrode line under the predetermined working condition according to the simulation model may be implemented by the following steps: according to the simulation model, determining first wire potentials of each of a plurality of towers included in a target grounding electrode line under a preset working condition and first ground potentials of each of the towers; the difference between the first wire potential and the first ground potential of each of the plurality of towers is determined to be a first potential difference of each of the plurality of towers, wherein the power data includes the first potential difference.

Optionally, the power data may include potential data of the target earth line, a point where the potential at infinity is zero may be used to calculate a potential value of the potential on the target earth line with respect to the potential at infinity, a potential value of the ground potential at a location where the target earth line is located with respect to infinity may also be calculated, a difference between the potential on the target earth line and the corresponding ground potential is calculated as a first potential difference, whether an overhauler overhauling the target earth line is at risk of electric shock is determined according to the first potential difference, and how to segment the target earth line is determined according to the first potential difference.

In the actual power system, since the lines need to be supported by towers, when calculating the electric potential on the target grounding electrode line, a plurality of towers on the target grounding electrode line may be used as calculation points, the first wire electric potentials of the towers included in the target grounding electrode line, that is, the electric potentials of the target grounding electrode line at the towers, may be calculated, then the first ground potentials of the positions of the towers may be calculated, and finally the difference between the first wire electric potentials and the first ground potentials may be determined as the first electric potentials corresponding to the towers. Because the maintainer may need to climb the tower when overhauling, the body is likely to contact the wire on the tower and the ground at the position of the tower at the same time, if there is a great potential difference between the wire on the tower and the ground at the position of the tower, then a great voltage can be generated on the body of the maintainer, resulting in electric shock to the maintainer.

As an alternative embodiment, the division of the target earth line into multiple segments of lines according to the power data may be achieved by: marking a tower corresponding to the first potential difference exceeding a first threshold as a dangerous tower; determining a tower closest to the dangerous tower and the tower type of which is a tension tower as a target tower; and dividing the target grounding electrode line into a plurality of sections of lines according to the target tower.

Alternatively, the human body can bear voltage within a certain limit, and when the voltage on the human body exceeds the bearing range of the human body, the human body is injured. The first threshold may be a safety voltage bearable by a human body, and when the first potential difference corresponding to some towers exceeds the safety voltage bearable by the human body, the lines corresponding to the towers need to be processed, otherwise, a large electric shock risk is brought to an maintainer during maintenance. The towers corresponding to the first potential difference exceeding the first threshold value can be marked as dangerous towers according to the first potential difference, and the target grounding electrode line can be segmented according to the positions of the dangerous towers.

It should be noted that, because the types of towers supporting the circuit in the actual power system are different, some towers are tension towers, which play an important role in supporting, and the internal circuit structure can enable the target grounding electrode circuit to be disconnected at the position; still other towers simply support the line such that the line is remote from the ground, nor does the internal circuit configuration enable the target ground line to be disconnected there. Therefore, the strain tower closest to the dangerous tower can be taken as the target tower near the dangerous tower, and the target grounding electrode line is divided into a plurality of sections of lines from the target tower.

Optionally, a plurality of strain towers which can be segmented in the target grounding electrode line can be determined, then a plurality of segmentation schemes for the target grounding electrode line are determined, then the target grounding electrode line is divided into different multi-section lines by different segmentation schemes through simulation at the positions of the strain towers in sequence, power data corresponding to the different schemes are obtained, and an optimal segmentation scheme can be determined according to the power data corresponding to the different schemes. Specifically, it can be determined that 10 strain towers exist in the target grounding electrode line, the target grounding electrode line can be divided into two sections by taking the 10 strain towers as the sectioning points respectively, then after the target grounding electrode line is divided into two sections by taking the 10 strain towers as the sectioning points respectively, potential differences of line potentials and ground potentials corresponding to a plurality of towers on the target grounding electrode line can be simulated respectively, and a scheme with the highest safety degree in a plurality of schemes can be selected as an implementation scheme according to the potential differences.

As an alternative embodiment, the division of the target ground line into multiple segments according to the target tower may be achieved by: and generating an instruction for opening the common-electrode-address disconnecting link in the target tower, and dividing the target grounding electrode line into a plurality of sections of lines.

Optionally, after analysis according to the power data obtained by simulation, it is determined that the target grounding electrode line can be divided into multiple sections at the position of the target tower, and at this time, an instruction can be sent to the target tower, so that the common electrode knife gate in the target tower is disconnected, the target grounding electrode line is divided into multiple sections, and then the multiple sections of lines can be overhauled respectively.

As an alternative embodiment, the maintenance of the multi-section lines can be achieved by the following steps: according to the simulation model, determining second conductor potentials corresponding to the towers respectively and the second ground potentials corresponding to the towers respectively, wherein the towers are included in the multi-section line under the preset working condition; determining that differences between the second wire potentials and the second ground potentials corresponding to the towers are second potential differences corresponding to the towers respectively; and determining that the overhaul mode of the tower corresponding to the second potential difference exceeding the second threshold value is electrified overhaul.

Optionally, after determining the scheme of the sectional overhaul, the running condition of the multi-section line under the preset working condition may be simulated, the second conductor potential on the line corresponding to each of the towers included in the multi-section line and the second ground potential at the position where each of the towers is located may be determined, then the difference between the second conductor potential corresponding to each of the towers and the second ground potential may be determined as the second potential difference corresponding to each of the towers, and if the second potential difference still has a larger potential difference, and the second potential difference exceeds the second threshold value, the second potential difference may be overhauled by adopting an electrified overhaul manner, so as to improve the safety of an overhauler.

The safety of the live line inspection may be higher than that of the conventional inspection operation, but the efficiency of the operation is low, so that the line inspection of the earth electrode is performed so as to avoid the live line inspection as much as possible when the conditions allow.

As an alternative embodiment, the establishment of a simulation model including the direct-current transmission common grounding electrode system and the target direct-current transmission line can be realized by the following steps: acquiring engineering parameters and power parameters of a direct-current transmission common grounding electrode system, engineering parameters and power parameters of a target direct-current transmission line, and a connection relationship between the direct-current transmission common grounding electrode system and the target direct-current transmission line; establishing a simulation model of the direct-current transmission common grounding electrode system according to engineering parameters and power parameters of the direct-current transmission common grounding electrode system; establishing a simulation model of the target direct current transmission line according to engineering parameters and power parameters of the target direct current transmission line; and establishing a simulation model comprising the direct-current transmission common grounding electrode system and the target direct-current transmission line according to the connection relation between the direct-current transmission common grounding electrode system and the target direct-current transmission line.

Optionally, the direct current common grounding electrode system may include a grounding electrode line and a grounding electrode, where engineering parameters of the grounding electrode may include a design condition of the grounding electrode, a soil condition near the grounding electrode, and the like, and engineering parameters of the grounding electrode line may include a design size of a tower, a length of the grounding electrode line, a design condition of a grounding grid of the converter station, and the like; the electric power parameters of the direct current transmission common grounding electrode system can be the resistance of a wire and the like; the engineering parameters of the target direct current transmission line can comprise the wire length, the tower design size and the like of the target direct current transmission line; the power parameter of the target dc transmission line may be a wire resistance of the target dc transmission system, etc.

As a specific embodiment, the common grounding electrode of the B direct current transmission project with the grounding electrode A of +/-500 kV and the C direct current transmission project with the grounding electrode C of +/-800 kV can obtain the design scheme of the grounding electrode, and a simulation model of the grounding electrode is established; the A direct current common grounding electrode system comprises a B grounding electrode line and a C grounding electrode line, wherein the B grounding electrode line of the + -500 kV B direct current transmission project starts from a D converter station frame, ends at an A grounding electrode incoming line frame, the C grounding electrode line of the + -800 kV C direct current transmission project starts from an E converter station frame, ends at an A grounding electrode incoming line frame, ends at 94.2km, and the B grounding electrode line and the C grounding electrode line are converged at an A common grounding electrode central tower.

Taking the current injected into the grounding electrode A as 3125A, taking the soil model as the soil structure of the grounding electrode A, and establishing a calculation simulation model by means of software. And adding an observation point positioned on the ground surface at the grounding electrode tower, and calculating the contact potential of the observation point (tower). The method is characterized in that an infinite zero potential is taken as a reference point, a conductor of a grounding electrode line is a first section, a grounding electrode line of a C converter station is a last section, 447 sections are shared, corresponding observation points (towers) are a first point and a last point, 448 points are shared, and 448 end points are also shared by the grounding electrode line. When the grounding disconnecting link of the grounding electrode line in the converter station is not disconnected, the grounding network of the converter station is connected with the grounding electrode line, and the potential difference between the potential of the grounding electrode line after the permanent grounding wire is hung, the potential of the observation point and the potential difference between the potential of the grounding electrode line and the potential difference is calculated.

In the process of overhauling the grounding electrode line, if no safety measures are adopted, a person can stand on the pole tower to contact with the grounding electrode line wire, and the potential difference between the pole tower and the grounding electrode line is born. The potential difference increases and decreases gradually, and decreases gradually after increasing gradually, and is about 219.19V (446 # tower) at maximum. At the insulated overhead ground wire section 447# tower, the contact potential of the tower is approximately 5.80V, well below 35V specified in the GB/T3805-2008 ultra-low voltage (elv) limit. The potential difference between the grounding electrode lines of the 445-430# and 428# towers and the towers exceeds 35V, and safety measures are needed. In the tower sections of 429# and 427-002# which are erected on the same tower, the potential difference between the grounding electrode line of the 429-407# tower and the tower is lower than 35V, and the potential difference between the grounding electrode line of the 405-58# tower and the tower exceeds 35V, so that safety measures are needed. The potential difference between the grounding electrode line of the 57-2# tower and the tower is lower than 35V.

And for the B grounding electrode line within 10km of the A grounding electrode, 447#, 442#, 431#, and 430# towers are strain towers, so that sectional maintenance can be performed. If the tower is overhauled from the 447# tower, the transfer potential difference between the grounding electrode lines at the 447# 433# and 398# 97# towers and the tower is more than 50V, and the transfer potential difference between the 432# 399# tower and the 96# 1# grounding electrode lines and the tower is less than 50V. As can be seen from the calculation, the dc current flowing through the ground down conductor of the tower at 447# is approximately 83.68A. The towers with the transfer potential difference between the grounding electrode line and the towers being less than 50V are shown in table 1.

Table 1 towers with transfer potential differences between the sections of different strain towers for overhauling grounding electrode lines and towers less than 50V

Note that: * The condition that the tower DC line at the position of 429 is hung with a ground wire is shown in the section overhaul of the 430# tower.

When the strain tower 430# section is overhauled, the tower with the transfer potential difference between the grounding electrode line and the tower not smaller than 50V can be overhauled in a live working mode. It should be noted that, compared with the conventional maintenance operation, the safety of the live working mode maintenance may be higher, but the operation efficiency is lower, so that the live working mode maintenance is avoided as much as possible when the condition allows the maintenance of the grounding electrode line.

It should be noted that, for simplicity of description, the foregoing method embodiments are all described as a series of acts, but it should be understood by those skilled in the art that the present invention is not limited by the order of acts described, as some steps may be performed in other orders or concurrently in accordance with the present invention. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present invention.

From the above description of the embodiments, it will be clear to those skilled in the art that the method for overhauling a dc power transmission common ground system according to the above embodiments may be implemented by software plus a necessary general hardware platform, or may be implemented by hardware, but in many cases, the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present invention.

According to an embodiment of the present invention, there is further provided a direct current transmission common ground system maintenance device for implementing the direct current transmission common ground system maintenance method, and fig. 3 is a block diagram of a direct current transmission common ground system maintenance device provided according to an embodiment of the present invention, as shown in fig. 3, where the direct current transmission common ground system maintenance device includes: the simulation module 32, the determination module 34, the segmentation module 36 and the maintenance module 38 are described below as a maintenance device for the dc transmission common ground system.

The simulation module 32 is configured to establish a simulation model including a dc power transmission common ground system and a target dc power transmission line, where the dc power transmission common ground system includes: the system comprises a plurality of grounding electrode lines and a common grounding electrode, wherein the plurality of grounding electrode lines are used for connecting a plurality of corresponding direct current transmission lines to the common grounding electrode, and the plurality of direct current transmission lines comprise target direct current transmission lines.

The determining module 34 is connected to the simulation module 32, and is configured to determine, according to the simulation model, power data of a target grounding electrode line corresponding to the target direct current power transmission line under a predetermined working condition.

The segmentation module 36 is connected to the determination module 34, and is configured to divide the target earth line into multiple segments according to the power data.

And the overhauling module 38 is connected with the sectioning module 36 and is used for overhauling the multi-section line respectively.

It should be noted that, the simulation model 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 are the same as the examples and application scenarios implemented by the corresponding steps, but are not limited to the disclosure of the above embodiment. It should be noted that the above-described module may be operated as a part of the apparatus in the computer terminal 10 provided in the embodiment.

Embodiments of the present invention may provide a computer device, optionally in this embodiment, the computer device may be located in at least one network device of a plurality of network devices of a computer network. The computer device includes a memory and a processor.

The memory may be used to store software programs and modules, such as program instructions/modules corresponding to the method and apparatus for overhauling a dc transmission common ground system in the embodiment of the present invention, and the processor executes various functional applications and data processing by running the software programs and modules stored in the memory, thereby implementing the method for overhauling a dc transmission common ground system. The memory may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory may further include memory remotely located relative to the processor, which may be connected to the computer terminal via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The processor may call the information and the application program stored in the memory through the transmission device to perform the following steps: establishing a simulation model comprising a direct-current transmission common grounding electrode system and a target direct-current transmission line, wherein the direct-current transmission common grounding electrode system comprises: the system comprises a plurality of grounding electrode lines and a common grounding electrode, wherein the plurality of grounding electrode lines are used for connecting a plurality of corresponding direct current transmission lines to the common grounding electrode, and the plurality of direct current transmission lines comprise target direct current transmission lines; determining electric power data of a target grounding electrode line corresponding to the target direct-current transmission line under a preset working condition according to the simulation model; dividing the target grounding electrode circuit into a plurality of sections of circuits according to the electric power data; and overhauling the multi-section lines respectively.

Optionally, the above processor may further execute program code for: according to the simulation model, determining the power data of the target grounding electrode line under the preset working condition comprises the following steps: according to the simulation model, determining first wire potentials of each of a plurality of towers included in a target grounding electrode line under a preset working condition and first ground potentials of each of the towers; the difference between the first wire potential and the first ground potential of each of the plurality of towers is determined to be a first potential difference of each of the plurality of towers, wherein the power data includes the first potential difference.

Optionally, the above processor may further execute program code for: dividing the target earth electrode line into a plurality of lines according to the power data, comprising: marking a tower corresponding to the first potential difference exceeding a first threshold as a dangerous tower; determining a tower closest to the dangerous tower and the tower type of which is a tension tower as a target tower; and dividing the target grounding electrode line into a plurality of sections of lines according to the target tower.

Optionally, the above processor may further execute program code for: according to the target tower, divide the target earth electrode circuit into multistage circuit, include: and generating an instruction for opening the common-electrode-address disconnecting link in the target tower, and dividing the target grounding electrode line into a plurality of sections of lines.

Optionally, the above processor may further execute program code for: overhauling a plurality of sections of lines respectively, comprising: according to the simulation model, determining second conductor potentials corresponding to the towers respectively and the second ground potentials corresponding to the towers respectively, wherein the towers are included in the multi-section line under the preset working condition; determining that differences between the second wire potentials and the second ground potentials corresponding to the towers are second potential differences corresponding to the towers respectively; and determining that the overhaul mode of the tower corresponding to the second potential difference exceeding the second threshold value is electrified overhaul.

Optionally, the above processor may further execute program code for: establishing a simulation model comprising a direct-current transmission common grounding electrode system and a target direct-current transmission line, wherein the simulation model comprises the following steps: acquiring engineering parameters and power parameters of a direct-current transmission common grounding electrode system, engineering parameters and power parameters of a target direct-current transmission line, and a connection relationship between the direct-current transmission common grounding electrode system and the target direct-current transmission line; establishing a simulation model of the direct-current transmission common grounding electrode system according to engineering parameters and power parameters of the direct-current transmission common grounding electrode system; establishing a simulation model of the target direct current transmission line according to engineering parameters and power parameters of the target direct current transmission line; and establishing a simulation model comprising the direct-current transmission common grounding electrode system and the target direct-current transmission line according to the connection relation between the direct-current transmission common grounding electrode system and the target direct-current transmission line.

Optionally, the above processor may further execute program code for: the preset working condition is that the target grounding electrode line is an overhaul working condition, and the lines except the target direct current transmission line in the plurality of direct current transmission lines are direct current monopole earth operation working conditions.

By adopting the embodiment of the invention, a scheme for overhauling the direct-current transmission common grounding electrode system is provided. In the embodiment of the invention, a mode of dividing a target grounding electrode line into a plurality of sections of lines for overhauling is adopted, and a simulation model comprising a direct-current transmission common grounding electrode system and the target direct-current transmission line is established, wherein the direct-current transmission common grounding electrode system comprises: the system comprises a plurality of grounding electrode lines and a common grounding electrode, wherein the plurality of grounding electrode lines are used for connecting a plurality of corresponding direct current transmission lines to the common grounding electrode, and the plurality of direct current transmission lines comprise target direct current transmission lines; determining electric power data of a target grounding electrode line corresponding to the target direct-current transmission line under a preset working condition according to the simulation model; dividing the target grounding electrode circuit into a plurality of sections of circuits according to the electric power data; the multi-section line is overhauled respectively, the purpose of reducing the potential difference between the ground potential and the line potential near the pole tower on the overhauling line is achieved, the technical effect of reducing the electric shock risk near the pole tower on the overhauling line is achieved, and the technical problem that the electric shock risk exists near the pole tower on the overhauling line due to the fact that the whole section of the grounding electrode line is overhauled in the related technology is solved.

Those skilled in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be implemented by a program for instructing a terminal device to execute on associated hardware, the program may be stored in a non-volatile storage medium, and the storage medium may include: flash disk, read-Only Memory (ROM), random-access Memory (Random Access Memory, RAM), magnetic or optical disk, and the like.

Embodiments of the present invention also provide a nonvolatile storage medium. Alternatively, in this embodiment, the above-mentioned nonvolatile storage medium may be used to store the program code executed by the direct current transmission common ground system maintenance method provided in the above-mentioned embodiment.

Alternatively, in this embodiment, the above-mentioned nonvolatile storage medium may 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.

Optionally, in the present embodiment, the non-volatile storage medium is arranged to store program code for performing the steps of: establishing a simulation model comprising a direct-current transmission common grounding electrode system and a target direct-current transmission line, wherein the direct-current transmission common grounding electrode system comprises: the system comprises a plurality of grounding electrode lines and a common grounding electrode, wherein the plurality of grounding electrode lines are used for connecting a plurality of corresponding direct current transmission lines to the common grounding electrode, and the plurality of direct current transmission lines comprise target direct current transmission lines; determining electric power data of a target grounding electrode line corresponding to the target direct-current transmission line under a preset working condition according to the simulation model; dividing the target grounding electrode circuit into a plurality of sections of circuits according to the electric power data; and overhauling the multi-section lines respectively.

Optionally, in the present embodiment, the non-volatile storage medium is arranged to store program code for performing the steps of: according to the simulation model, determining the power data of the target grounding electrode line under the preset working condition comprises the following steps: according to the simulation model, determining first wire potentials of each of a plurality of towers included in a target grounding electrode line under a preset working condition and first ground potentials of each of the towers; the difference between the first wire potential and the first ground potential of each of the plurality of towers is determined to be a first potential difference of each of the plurality of towers, wherein the power data includes the first potential difference.

Optionally, in the present embodiment, the non-volatile storage medium is arranged to store program code for performing the steps of: dividing the target earth electrode line into a plurality of lines according to the power data, comprising: marking a tower corresponding to the first potential difference exceeding a first threshold as a dangerous tower; determining a tower closest to the dangerous tower and the tower type of which is a tension tower as a target tower; and dividing the target grounding electrode line into a plurality of sections of lines according to the target tower.

Optionally, in the present embodiment, the non-volatile storage medium is arranged to store program code for performing the steps of: according to the target tower, divide the target earth electrode circuit into multistage circuit, include: and generating an instruction for opening the common-electrode-address disconnecting link in the target tower, and dividing the target grounding electrode line into a plurality of sections of lines.

Optionally, in the present embodiment, the non-volatile storage medium is arranged to store program code for performing the steps of: overhauling a plurality of sections of lines respectively, comprising: according to the simulation model, determining second conductor potentials corresponding to the towers respectively and the second ground potentials corresponding to the towers respectively, wherein the towers are included in the multi-section line under the preset working condition; determining that differences between the second wire potentials and the second ground potentials corresponding to the towers are second potential differences corresponding to the towers respectively; and determining that the overhaul mode of the tower corresponding to the second potential difference exceeding the second threshold value is electrified overhaul.

Optionally, in the present embodiment, the non-volatile storage medium is arranged to store program code for performing the steps of: establishing a simulation model comprising a direct-current transmission common grounding electrode system and a target direct-current transmission line, wherein the simulation model comprises the following steps: acquiring engineering parameters and power parameters of a direct-current transmission common grounding electrode system, engineering parameters and power parameters of a target direct-current transmission line, and a connection relationship between the direct-current transmission common grounding electrode system and the target direct-current transmission line; establishing a simulation model of the direct-current transmission common grounding electrode system according to engineering parameters and power parameters of the direct-current transmission common grounding electrode system; establishing a simulation model of the target direct current transmission line according to engineering parameters and power parameters of the target direct current transmission line; and establishing a simulation model comprising the direct-current transmission common grounding electrode system and the target direct-current transmission line according to the connection relation between the direct-current transmission common grounding electrode system and the target direct-current transmission line.

Optionally, in the present embodiment, the non-volatile storage medium is arranged to store program code for performing the steps of: the preset working condition is that the target grounding electrode line is an overhaul working condition, and the lines except the target direct current transmission line in the plurality of direct current transmission lines are direct current monopole earth operation working conditions.

The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.

In the foregoing embodiments of the present invention, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.

In the several embodiments provided in the present application, it should be understood that the disclosed technology content may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a non-volatile storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims (10)

1. The maintenance method of the direct-current transmission common grounding electrode system is characterized by comprising the following steps of:

establishing a simulation model comprising a direct-current transmission common grounding electrode system and a target direct-current transmission line, wherein the direct-current transmission common grounding electrode system comprises: the system comprises a plurality of grounding electrode lines and a common grounding electrode, wherein the plurality of grounding electrode lines are used for connecting 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;

according to the simulation model, determining the power data of a target grounding electrode line corresponding to the target direct current transmission line under a preset working condition;

dividing the target grounding electrode circuit into a plurality of sections of circuits according to the electric power data;

and overhauling the multi-section lines respectively.

2. The method according to claim 1, wherein determining, according to the simulation model, power data of a target earth electrode line corresponding to the target direct current transmission line under a predetermined condition includes:

According to the simulation model, determining first wire potentials of each of a plurality of towers included in the target grounding electrode line under a preset working condition and first ground potentials of each of the plurality of towers;

determining that differences of first wire potentials and first ground potentials corresponding to the towers are first potential differences corresponding to the towers, respectively, wherein the power data includes the first potential differences.

3. The method of claim 2, wherein dividing the target ground line into multiple segments of lines based on the power data comprises:

marking a tower corresponding to the first potential difference exceeding a first threshold as a dangerous tower;

determining a tower closest to the dangerous tower and of which the tower type is a tension tower as a target tower;

and dividing the target grounding electrode line into a plurality of sections of lines according to the target tower.

4. A method according to claim 3, wherein said dividing said target earth line into a plurality of segments according to said target tower comprises:

and generating an instruction for opening a common-electrode-address disconnecting link in the target tower, and dividing the target grounding electrode line into the multiple sections of lines.

5. The method of claim 1, wherein the separately servicing the multi-segment lines comprises:

determining second conductor potentials corresponding to each of a plurality of towers included in the multi-section line under a preset working condition and second ground potentials corresponding to each of the towers according to the simulation model;

determining that differences of second wire potentials and second ground potentials corresponding to the towers are second potential differences corresponding to the towers respectively;

and determining that the overhaul mode of the tower corresponding to the second potential difference exceeding the second threshold value is electrified overhaul.

6. The method of claim 1, wherein the creating a simulation model comprising the dc power transmission common ground system and the target dc power transmission line comprises:

acquiring engineering parameters and power parameters of the direct-current transmission common grounding electrode system, engineering parameters and power parameters of the target direct-current transmission line and a connection relationship between the direct-current transmission common grounding electrode system and the target direct-current transmission line;

establishing a simulation model of the direct-current transmission common grounding electrode system according to engineering parameters and power parameters of the direct-current transmission common grounding electrode system;

Establishing a simulation model of the target direct current transmission line according to engineering parameters and power parameters of the target direct current transmission line;

and establishing a simulation model comprising the direct-current transmission common grounding electrode system and the target direct-current transmission line according to the connection relation between the direct-current transmission common grounding electrode system and the target direct-current transmission line.

7. The method of any one of claims 1 to 6, wherein the predetermined condition is that the target earth electrode line is a service condition, and a line of the plurality of dc power transmission lines other than the target dc power transmission line is a dc monopolar earth operation condition.

8. The utility model provides a direct current transmission sharing earth electrode system overhauls device which characterized in that includes:

the simulation module is used for establishing a simulation model comprising a direct-current transmission common grounding electrode system and a target direct-current transmission line, wherein the direct-current transmission common grounding electrode system comprises: the system comprises a plurality of grounding electrode lines and a common grounding electrode, wherein the plurality of grounding electrode lines are used for connecting 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;

The determining module is used for determining the power data of the target grounding electrode line corresponding to the target direct-current power transmission line under a preset working condition according to the simulation model;

the segmentation module is used for dividing the target grounding electrode circuit into a plurality of sections of circuits according to the power data;

and the overhaul module is used for overhauling the multi-section lines respectively.

9. A non-volatile storage medium, characterized in that the non-volatile storage medium comprises a stored program, wherein the program, when run, controls a device in which the non-volatile storage medium is located to perform the direct current transmission common ground system maintenance method according to any one of claims 1 to 7.

10. A computer device, comprising: a memory and a processor, wherein the memory is configured to store,

the memory stores a computer program;

the processor is configured to execute a computer program stored in the memory, where the computer program when executed causes the processor to execute the method for overhauling the dc transmission common ground system according to any one of claims 1 to 7.

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