Method and system for positioning traveling wave fault section of current collection line of offshore wind plant

Abstract

The invention belongs to the field of offshore wind plants, and provides an offshore wind plant current collection line traveling wave fault section positioning method and system. The method comprises the following steps: acquiring seawater corrosion state data of a current collection line of an offshore wind plant, and obtaining a traveling wave fault section positioning corrosion influence factor; constructing a monitoring terminal operation state analysis factor by combining a traveling wave fault section positioning corrosion influence factor; judging whether the running state of the monitoring terminal is reliable or not according to a comparison result of the monitoring terminal running state analysis factor and a set threshold value; when the operation state of the monitoring terminal is reliable, obtaining a traveling wave fault section positioning electromagnetic influence factor based on the electromagnetic interference state data of the current collection line of the offshore wind plant, and judging whether a traveling wave fault section positioning signal is reliable or not; when the traveling wave fault section positioning signal is reliable, the fault section of the current collection line of the offshore wind plant is determined based on the initial traveling wave current polarity of each adjacent monitoring terminal, and the fault position of the current collection line of the offshore wind plant can be positioned more accurately.

Description

Technical Field

[0001] The present invention belongs to the field of offshore wind farms, and particularly relates to a method and system for locating traveling wave fault sections of a collector line in an offshore wind farm. Background Art

[0002] The statements in this part only provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] With the continuous expansion of the construction scale of offshore wind farms, the corresponding infrastructure such as collector lines is also increasing, and the requirements for its operation reliability are also increasing day by day. Compared with traditional fault location methods, traveling wave fault location technology is not affected by line parameters, system operation modes, and fault types, has higher reliability and accuracy, and can respond to faults quickly. There are still some deficiencies in the research on the location of traveling wave fault sections of collector lines in offshore wind farms. Specifically, traditional fault location methods based on power frequency quantities (such as power frequency components of current and voltage) mainly calculate the fault location using the steady-state power frequency electrical quantities after the fault. However, traveling waves are transient phenomena, containing rich high-frequency components, and their propagation characteristics are very different from power frequency signals. Since parameters such as distributed capacitance and inductance of the collector lines in offshore wind farms will affect the power frequency quantities, and in a complex offshore environment, the line parameters will change due to the offshore environment, all of which will lead to a large deviation between the fault location calculated based on power frequency quantities and the actual location. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a method and system for locating traveling wave fault sections of a collector line in an offshore wind farm, which can more accurately locate the fault location of the collector line in the offshore wind farm.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The first aspect of the present invention provides a method for locating traveling wave fault sections of a collector line in an offshore wind farm.

[0007] In one or more embodiments, a method for locating traveling wave fault sections of a collector line in an offshore wind farm is provided, including:

[0008] Obtain the seawater corrosion state data of the collector line in the offshore wind farm, and then obtain the corrosion influence factor for traveling wave fault section location;

[0009] Based on the wind and wave impact state data of the collector line in the offshore wind farm and the corrosion influence factor for traveling wave fault section location, construct an analysis factor for the operation state of the monitoring terminal;

[0010] According to the comparison result between the analysis factors of the monitoring terminal operation status and the set threshold of the analysis factors of the monitoring terminal operation status, determine whether the monitoring terminal operation status is reliable; when the monitoring terminal operation status is reliable, based on the electromagnetic interference status data of the collector line of the offshore wind farm, obtain the electromagnetic influence factor for the traveling wave fault section location, and then compare it with the preset electromagnetic influence factor threshold to determine whether the traveling wave fault section location signal is reliable;

[0011] When the traveling wave fault section location signal is reliable, obtain the initial traveling wave current polarities of each adjacent monitoring terminal, and based on the initial traveling wave current polarities of each adjacent monitoring terminal, determine the fault section of the collector line of the offshore wind farm.

[0012] As an implementation manner, the seawater corrosion status data of the collector line of the offshore wind farm includes the air salt fog concentration nd of the offshore wind farm, the corrosion area ratio fsm of the monitoring terminal housing, and the corrosion number ratio ljg of the monitoring terminal connection components; the corrosion influence factor for the traveling wave fault section location is:

[0013]

[0014] In the formula, α is the corrosion influence factor for the traveling wave fault section location, σ1 is the compensation factor for the set nd, σ2 is the compensation factor for the set fsm, and σ3 is the compensation factor for the set ljg.

[0015] As an implementation manner, the wind and wave impact status data of the collector line of the offshore wind farm includes the wind speed fs of the offshore wind farm, the average wave height lgo of the offshore wind farm, and the wind and wave impact force cjl received by the monitoring terminal; the analysis factor of the monitoring terminal operation status is:

[0016]

[0017] In the formula, β is the analysis factor of the monitoring terminal operation status, α is the corrosion influence factor for the traveling wave fault section location, τ1 is the compensation factor for the set fs, τ2 is the compensation factor for the set lgo, τ3 is the compensation factor for the set cjl, and e is the natural constant.

[0018] As an implementation manner, the electromagnetic influence factor for the traveling wave fault section location is:

[0019]

[0020] In the formula, ω is the electromagnetic influence factor for the traveling wave fault section location, dcq is the electric field intensity of the offshore wind farm, ccq is the magnetic field intensity of the offshore wind farm, xbb is the harmonic ratio of the offshore wind farm, ε1 is the compensation factor for the set dcq, ε2 is the compensation factor for the set ccq, and ε3 is the compensation factor for the set xbb.

[0021] As an implementation manner, the method for locating the traveling wave fault section of the collector line of the offshore wind farm further includes:

[0022] Analyze the communication link of the fault section of the collector line of the offshore wind farm to determine whether the control center successfully receives the information of the fault section of the collector line of the offshore wind farm.

[0023] As an implementation manner, obtain the communication link data of the collector line of the offshore wind farm to obtain the communication link transmission signal;

[0024] Judge whether the control center successfully receives the information of the fault section of the collector line of the offshore wind farm according to the communication link transmission signal;

[0025] If the communication link transmission signal is not lower than the communication link transmission threshold, the control center successfully receives the information of the fault section of the collector line of the offshore wind farm; if the communication link transmission signal is lower than the communication link transmission threshold, the control center does not successfully receive the information of the fault section of the collector line of the offshore wind farm, and the information of the fault section of the collector line of the offshore wind farm needs to be retransmitted.

[0026] As an implementation manner, the communication link data of the collector line of the offshore wind farm includes the communication link transmission delay, the communication link network bandwidth, and the communication link transmission packet loss rate; the communication link transmission signal is:

[0027]

[0028] In the formula, δ is the communication link transmission signal, sy is the communication link transmission delay, dk is the communication link network bandwidth, dbl is the communication link transmission packet loss rate, μ1 is the compensation factor of the set sy, μ2 is the compensation factor of the set dk, and μ3 is the compensation factor of the set dbl.

[0029] The second aspect of the present invention provides a system for locating the traveling wave fault section of the collector line of the offshore wind farm.

[0030] In one or more embodiments, a system for locating the traveling wave fault section of the collector line of the offshore wind farm includes:

[0031] A positioning corrosion influence factor calculation module, which is used to obtain the seawater corrosion state data of the collector line of the offshore wind farm, and then obtain the positioning corrosion influence factor of the traveling wave fault section;

[0032] A monitoring terminal operating state analysis factor calculation module, which is used to construct a monitoring terminal operating state analysis factor based on the wind and wave impact state data of the collector line of the offshore wind farm and the positioning corrosion influence factor of the traveling wave fault section;

[0033] The operating status and positioning signal reliability judgment module is used to judge whether the operating status of the monitoring terminal is reliable according to the comparison result between the analysis factors of the monitoring terminal operating status and the set threshold of the analysis factors of the monitoring terminal operating status; when the operating status of the monitoring terminal is reliable, based on the electromagnetic interference status data of the collector line of the offshore wind farm, the electromagnetic influence factor for locating the traveling wave fault section is obtained, and then compared with the preset electromagnetic influence factor threshold to judge whether the traveling wave fault section positioning signal is reliable;

[0034] The collector line fault section positioning module is used to obtain the initial traveling wave current polarities of adjacent monitoring terminals when the traveling wave fault section positioning signal is reliable, and determine the fault section of the collector line of the offshore wind farm based on the initial traveling wave current polarities of adjacent monitoring terminals.

[0035] As an implementation manner, the traveling wave fault section positioning system for the collector line of the offshore wind farm further includes:

[0036] The fault section information reception success judgment module is used to analyze the communication link of the fault section of the collector line of the offshore wind farm and judge whether the control center successfully receives the fault section information of the collector line of the offshore wind farm.

[0037] The third aspect of the present invention provides a computer-readable storage medium.

[0038] A computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the steps in the traveling wave fault section positioning method for the collector line of the offshore wind farm as described above are implemented.

[0039] The fourth aspect of the present invention provides an electronic device.

[0040] An electronic device includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the steps in the traveling wave fault section positioning method for the collector line of the offshore wind farm as described above are implemented.

[0041] Compared with the prior art, the beneficial effects of the present invention are:

[0042] (1) By providing the traveling wave fault section positioning method and system for the collector line of the offshore wind farm, the present invention can comprehensively consider various factors affecting the traveling wave fault section positioning by analyzing the seawater corrosion state, the wind and wave impact state, and the electromagnetic interference state, can more accurately locate the fault location, and reduce the error caused by the analysis of a single factor.

[0043] (2) The present invention determines the fault section based on the initial traveling wave current polarities of adjacent monitoring terminals, which can effectively avoid misjudgment of traditional positioning methods in complex offshore environments. After considering various influencing factors, it can capture the changes of traveling waves on both sides of the fault point more accurately, thereby precisely identifying the fault location, providing accurate information for subsequent maintenance work, and improving the operation efficiency of offshore wind farms.

[0044] (3) The present invention analyzes the impact state of wind and waves on the collector lines of offshore wind farms, combines the corrosion influencing factors for traveling wave fault section positioning, judges the operating state of the monitoring terminals, and issues unreliable early warning prompts in a timely manner, which helps to discover problems existing in the monitoring terminals in advance. Through timely early warning, maintenance measures can be taken before the monitoring terminals completely fail, ensuring that the monitoring terminals can continuously and accurately collect and transmit traveling wave signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings forming a part of this specification are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0046] Figure 1 is a schematic flow chart of a method for positioning a traveling wave fault section of a collector line in an offshore wind farm according to an embodiment of the present invention;

[0047] Figure 2 is a schematic flow chart of another method for positioning a traveling wave fault section of a collector line in an offshore wind farm according to an embodiment of the present invention;

[0048] Figure 3 is a schematic structural diagram of a system for positioning a traveling wave fault section of a collector line in an offshore wind farm according to an embodiment of the present invention;

[0049] Figure 4 is a schematic structural diagram of another system for positioning a traveling wave fault section of a collector line in an offshore wind farm according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0050] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0051] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0052] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0053] Accurately and quickly locating the fault section of the collector line is crucial for timely repairing the fault, reducing the power outage time, and improving the power supply reliability and safety of the offshore wind farm. By studying the traveling wave fault section location method, it is possible to provide strong technical support for the operation and maintenance management of the offshore wind farm, reduce the losses caused by faults, and promote the sustainable development of the offshore wind power industry.

[0054] Figure 1 It is a schematic flow chart of a method for locating the traveling wave fault section of the collector line in an offshore wind farm in an embodiment of the present invention. As Figure 1 shown, the method for locating the traveling wave fault section of the collector line in the offshore wind farm in this embodiment may include:

[0055] S101, obtaining the seawater corrosion state data of the collector line in the offshore wind farm, and then obtaining the corrosion influence factor for traveling wave fault section location.

[0056] In the embodiment of the present invention, the seawater corrosion state data of the collector line in the offshore wind farm includes the air salt fog concentration nd in the offshore wind farm, the corrosion area ratio fsm of the monitoring terminal housing, and the corrosion number ratio ljg of the monitoring terminal connection components.

[0057] The air salt fog concentration in the offshore wind farm refers to the amount of salt fog contained in the unit volume of air in the atmospheric environment of the offshore wind farm area. The salt fog is composed of tiny droplets suspended in the air formed by the sea water (mainly sodium chloride, etc.) under the action of wave breaking, sea water evaporation, and sea breeze. The corrosion area ratio of the monitoring terminal housing refers to the percentage of the area of the corroded part of the monitoring terminal device housing in the total surface area of the housing. The corrosion number ratio of the monitoring terminal connection components refers to the percentage of the number of corroded components in all connection components (such as screws, nuts, terminal blocks, plugs, sockets, etc.) in the monitoring terminal device in the total number of connection components.

[0058] The air salt fog concentration in an offshore wind farm is formed by the salts in seawater and is an important environmental factor causing corrosion. A high salt fog concentration means a more corrosive environment. The corrosion area ratio of the monitoring terminal housing and the corrosion number ratio of the connection components directly reflect the degree of seawater corrosion of the equipment. By obtaining data such as the air salt fog concentration in the offshore wind farm, the corrosion area ratio of the monitoring terminal housing, and the corrosion number ratio of the monitoring terminal connection components, the impact of seawater corrosion on the monitoring terminal can be accurately evaluated, so as to obtain a more accurate corrosion impact factor for traveling wave fault section location, and the impact of seawater corrosion on the monitoring terminal can be comprehensively considered. Quantifying the impact of corrosion can more precisely measure the impact of corrosion on the operation of the monitoring terminal, can targetedly evaluate the operation status of the monitoring terminal in a seawater corrosion environment, and thus take timely measures.

[0059] In this implementation plan, before each calculation formula is calculated, the corresponding parameters will be normalized.

[0060] The corrosion impact factor for traveling wave fault section location is:

[0061]

[0062] In the formula, α is the corrosion impact factor for traveling wave fault section location, σ1 is the compensation factor for the set nd, σ2 is the compensation factor for the set fsm, and σ3 is the compensation factor for the set ljg.

[0063] By comprehensively calculating the corrosion impact factor for traveling wave fault section location with the air salt fog concentration in the offshore wind farm, the corrosion area ratio of the monitoring terminal housing, and the corrosion number ratio of the monitoring terminal connection components, the impact of corrosion on traveling wave fault section location can be comprehensively considered. It should be explained that the above-mentioned compensation factors for nd, fsm, and ljg are obtained from the database. A mapping set of the air salt fog concentration in the historical measurement offshore wind farm, the corrosion area ratio of the monitoring terminal housing, the corrosion number ratio of the monitoring terminal connection components, and the compensation factors for nd, fsm, and ljg is established based on historical data to obtain the compensation factors for nd, fsm, and ljg corresponding to the current nd, fsm, and ljg.

[0064] It should be noted that τ1, τ2, τ3, ε1, ε2, ε3, μ1, μ2, μ3 in the following text are also obtained through the mapping set of historical data and compensation factors established in the database, that is, the corresponding compensation factors are obtained according to the current data.

[0065] S102. Based on the data of the wind and wave impact state of the collector line in the offshore wind farm and the corrosion impact factor for traveling wave fault section location, construct an analysis factor for the operation status of the monitoring terminal.

[0066] In this embodiment, the data on the state of the wind and wave impact on the collector line of the offshore wind farm includes the wind speed fs of the offshore wind farm, the average wave height lgo of the offshore wind farm, and the wind and wave impact force cjl received by the monitoring terminal.

[0067] The wind speed of the offshore wind farm refers to the air flow speed in the sea area where the offshore wind farm is located. High wind speeds can have various effects on the collector line of the offshore wind farm. For the overhead line part (if any), strong winds will cause the line to swing and vibrate, resulting in mechanical fatigue and wear of the line. Wind speed is also one of the main driving factors for generating sea waves. Strong winds can also trigger larger sea waves, indirectly affecting equipment such as submarine cables and monitoring terminals. In addition, high wind speeds may carry substances such as salt fog, accelerating the corrosion of equipment.

[0068] The average wave height of the offshore wind farm refers to the average vertical distance between the wave crest and the wave trough of the sea waves within a certain time and a certain sea area range. The wind and wave impact force received by the monitoring terminal refers to the magnitude of the force acting on the monitoring terminal equipment due to the combined action of the wind force and the wave impact force in the offshore wind farm environment.

[0069] Wind and wave impact and corrosion are two main factors causing damage to equipment in the marine environment. By comprehensively analyzing the operating state of the monitoring terminal by combining the data on the state of wind and wave impact (wind speed, average wave height, wind and wave impact force) and the corrosion influence factor for the traveling wave fault section location, the impacts of various adverse factors in the offshore wind farm on the monitoring terminal can be fully considered, and the actual situation of the monitoring terminal in the complex marine environment can be more realistically reflected. By comparing the analysis factor of the monitoring terminal operating state with the threshold value stored in the database (this threshold value can be matched and set according to the actual situation), an effective early warning system can be established. When the analysis factor is lower than the threshold value, an unreliable early warning prompt is issued in a timely manner, and the potential failure risks of the monitoring terminal can be detected in advance.

[0070] If the analysis factor of the monitoring terminal operating state is lower than the analysis threshold value of the monitoring terminal operating state, the operating state of the monitoring terminal corresponding to this analysis factor of the monitoring terminal operating state is unreliable, and an unreliable early warning prompt is issued for the operating state of the monitoring terminal; if the analysis factor of the monitoring terminal operating state is not lower than the analysis threshold value of the monitoring terminal operating state, the operating state of the monitoring terminal corresponding to this analysis factor of the monitoring terminal operating state is reliable.

[0071] The analysis factor of the monitoring terminal operating state is:

[0072]

[0073] In the formula, β is the analysis factor of the monitoring terminal operating state, α is the corrosion influence factor for the traveling wave fault section location, τ1 is the compensation factor for the set fs, τ2 is the compensation factor for the set lgo, τ3 is the compensation factor for the set cjl, and e is the natural constant.

[0074] The wind speed, average wave height of an offshore wind farm, and the impact force of wind and waves on the monitoring terminal reflect the mechanical effects of wind and wave factors in the offshore environment on the monitoring terminal. By combining these factors with the corrosion influence factor for traveling wave fault section location, the two main damage factors, mechanical and chemical, in the offshore environment can be comprehensively considered, and the obtained analysis factor for the operating state of the monitoring terminal can more truly reflect the overall operating state of the monitoring terminal in the complex offshore environment.

[0075] S103. According to the comparison result between the analysis factor for the operating state of the monitoring terminal and the set threshold of the analysis factor for the operating state of the monitoring terminal, determine whether the operating state of the monitoring terminal is reliable; when the operating state of the monitoring terminal is reliable, based on the electromagnetic interference state data of the collector line in the offshore wind farm, obtain the electromagnetic influence factor for traveling wave fault section location, and then compare it with the preset electromagnetic influence factor threshold to determine whether the traveling wave fault section location signal is reliable.

[0076] The electromagnetic interference state data of the collector line in the offshore wind farm specifically includes the electric field intensity, magnetic field intensity, and harmonic ratio of the offshore wind farm; based on the obtained electromagnetic interference state data of the collector line in the offshore wind farm, comprehensively analyze to obtain the electromagnetic influence factor for traveling wave fault section location, and the electromagnetic influence factor for traveling wave fault section location is used as the analysis basis for judging whether the traveling wave fault section location signal is reliable.

[0077] The electric field intensity of an offshore wind farm is a physical quantity that describes the strength and direction of the electric field in the space around the offshore wind farm. The electric field is mainly generated by the charge distribution in the collector line, and a higher electric field intensity will cause electromagnetic interference to nearby electronic devices and communication systems. The magnetic field intensity of an offshore wind farm is a physical quantity that describes the strength and direction of the magnetic field in the space around the offshore wind farm. An overly strong magnetic field intensity will cause electromagnetic interference to nearby magnetic-sensitive devices. The harmonic ratio of an offshore wind farm refers to the ratio of the effective value of harmonic current (or voltage) to the effective value of fundamental wave current (or voltage) in the electrical system of the wind farm, usually expressed as a percentage. For a communication system, harmonics will generate electromagnetic radiation and interfere with nearby radio communications, radar signals, etc. In the traveling wave fault section location, harmonics will overlap with the frequency components of the location signal, resulting in misjudgment of the signal or interference with the extraction of the signal, thus affecting the reliability of the location signal.

[0078] The electric field and magnetic field will interfere with signal transmission through coupling and other means, and harmonics, as non-ideal signal components, will also interfere with the location signal. By obtaining the electromagnetic interference state data such as the electric field intensity, magnetic field intensity, and harmonic ratio of the offshore wind farm, the influence of the electromagnetic environment on the traveling wave fault section location signal can be comprehensively considered, and the influence of electromagnetic interference on the traveling wave fault section location signal can be accurately evaluated, so as to obtain a more accurate electromagnetic influence factor for traveling wave fault section location.

[0079] Taking the electromagnetic influence factor of traveling wave fault section location as the analysis basis for judging whether the traveling wave fault section location signal is reliable can specifically evaluate the quality of the traveling wave fault section location signal in an electromagnetic interference environment and can more comprehensively reflect the influence of electromagnetic interference on the location signal. If the electromagnetic influence factor exceeds a certain set threshold, it can be judged that the traveling wave fault section location signal is severely affected, and thus measures can be taken in a timely manner to ensure that the traveling wave fault section location signal can be normally collected and processed, improving the accuracy of the entire fault location system.

[0080] The electromagnetic influence factor of traveling wave fault section location in this embodiment is:

[0081]

[0082] In the formula, ω is the electromagnetic influence factor of traveling wave fault section location, dcq is the electric field intensity of the offshore wind farm, ccq is the magnetic field intensity of the offshore wind farm, xbb is the harmonic ratio of the offshore wind farm, ε1 is the compensation factor of the set dcq, ε2 is the compensation factor of the set ccq, and ε3 is the compensation factor of the set xbb.

[0083] If the operating state of the monitoring terminal is unreliable, an unreliable warning prompt is issued for the operating state of the monitoring terminal;

[0084] If the traveling wave fault section location signal is unreliable, an unreliable warning prompt is issued for the traveling wave fault section location signal.

[0085] The electric field and magnetic field can interfere with signal transmission through electromagnetic induction and other means, and harmonics will cause signal distortion and increased noise. The electric field intensity, magnetic field intensity, and harmonic ratio of the offshore wind farm are the key factors affecting the electromagnetic environment. Calculating the electromagnetic influence factor of traveling wave fault section location can comprehensively and systematically consider the influence of electromagnetic interference on traveling wave fault section location and can truly reflect the comprehensive interference degree of the electromagnetic environment on the traveling wave fault section location signal.

[0086] Compare the electromagnetic influence factor of traveling wave fault section location with the electromagnetic influence threshold of traveling wave fault section location stored in the database;

[0087] If the electromagnetic influence factor of traveling wave fault section location is not lower than the electromagnetic influence threshold of traveling wave fault section location, the traveling wave fault section location signal corresponding to the electromagnetic influence factor of traveling wave fault section location is reliable; if the electromagnetic influence factor of traveling wave fault section location is lower than the electromagnetic influence threshold of traveling wave fault section location, the traveling wave fault section location signal corresponding to the electromagnetic influence factor of traveling wave fault section location is unreliable, and an unreliable warning prompt is issued for the traveling wave fault section location signal.

[0088] The electromagnetic influence factor is obtained by comprehensively considering multiple electromagnetic interference factors such as electric field strength, magnetic field strength, and harmonic ratio. The threshold is a determined reasonable boundary, making the judgment of signal reliability more objective and accurate. By comparing the electromagnetic influence factor of the traveling wave fault section location with the pre-set electromagnetic influence threshold, a quantitative evaluation criterion is provided, avoiding the uncertainty of simply relying on subjective judgment to evaluate signal reliability. This helps to ensure the reliability of the traveling wave fault section location system. A reliable positioning signal is the key to accurately determining the fault section. By issuing early warnings in a timely manner and taking measures (such as strengthening electromagnetic shielding, adjusting signal processing algorithms, etc.), signal errors or losses caused by electromagnetic interference can be reduced, thereby improving the accuracy and timeliness of fault location.

[0089] S104. When the traveling wave fault section location signal is reliable, obtain the initial traveling wave current polarities of each adjacent monitoring terminal, and based on the initial traveling wave current polarities of each adjacent monitoring terminal, determine the fault section of the offshore wind farm collector line.

[0090] Obtain the initial traveling wave current polarities of each adjacent monitoring terminal and compare the initial traveling wave current polarities of each adjacent monitoring terminal; if the initial traveling wave current polarities of the adjacent monitoring terminals are the same, the section between the adjacent monitoring terminals is not the fault section of the offshore wind farm collector line; if the initial traveling wave current polarities of the adjacent monitoring terminals are opposite, the section between the adjacent monitoring terminals is the fault section of the offshore wind farm collector line.

[0091] Based on the physical principle that the polarities on both sides of the fault point are opposite for traveling waves. When a fault occurs in the collector line, a traveling wave will be generated at the fault point and propagate towards both ends of the line. On both sides of the fault point, the direction (i.e., polarity) of the traveling wave current must be opposite. By comparing the initial traveling wave current polarities of adjacent monitoring terminals, this physical characteristic can be directly utilized to locate the fault section, avoiding complex calculations and excessive dependence on line parameters, thereby improving the accuracy of fault location. The fault section where the fault occurs can be accurately determined.

[0092] In a complex system such as the offshore wind farm collector line, traditional fault location methods are affected by various factors such as line branches, different cable types, and electromagnetic interference, resulting in errors. The method based on comparing the traveling wave current polarities can effectively eliminate these interference factors, accurately find the fault section, and improve the maintenance efficiency. Comparing the initial traveling wave current polarities of adjacent monitoring terminals is a relatively simple and intuitive method. Only the polarity information of the traveling wave current needs to be obtained, without the need for complex equipment and a large amount of computing resources. When a fault occurs, the data collected by the monitoring terminals can be quickly analyzed and judged to determine the fault section in a timely manner, reducing losses and the impact on grid stability.

[0093] In another embodiment, as Figure 2As shown, the method for locating the traveling wave fault section of the collector line of the offshore wind farm further includes:

[0094] S105: Analyze the communication link of the fault section of the collector line of the offshore wind farm to determine whether the control center has successfully received the information of the fault section of the collector line of the offshore wind farm.

[0095] Among them, obtain the communication link data of the collector line of the offshore wind farm to get the communication link transmission signal;

[0096] Judge whether the control center has successfully received the information of the fault section of the collector line of the offshore wind farm according to the communication link transmission signal;

[0097] If the communication link transmission signal is not lower than the communication link transmission threshold, the control center has successfully received the information of the fault section of the collector line of the offshore wind farm; if the communication link transmission signal is lower than the communication link transmission threshold, the control center has not successfully received the information of the fault section of the collector line of the offshore wind farm, and the information of the fault section of the collector line of the offshore wind farm needs to be retransmitted.

[0098] Among them, the communication link data of the collector line of the offshore wind farm includes communication link transmission delay, communication link network bandwidth, and communication link transmission packet loss rate;

[0099] The communication link transmission delay refers to the time delay experienced when data is transmitted from the sending end (such as the monitoring terminal of the offshore wind farm) to the receiving end (such as the control center) through the communication link. The communication link network bandwidth refers to the amount of data that the communication link can transmit per unit time, which reflects the transmission capacity of the communication link. It is usually measured in bits per second (bit / s) or its multiples (such as kilobits per second kbit / s, megabits per second Mbit / s, etc.). The communication link transmission packet loss rate refers to the ratio of the number of lost data packets to the total number of data packets sent during the data transmission process.

[0100] The transmission delay reflects the speed of information transmission in the link, the network bandwidth determines the amount of data that can be transmitted per unit time, and the transmission packet loss rate reflects the loss situation of data during transmission. By obtaining these data such as communication link transmission delay, network bandwidth, and transmission packet loss rate to comprehensively analyze the communication link transmission signal, the state of the communication link can be comprehensively evaluated. Considering these factors comprehensively, the actual performance of the communication link can be accurately grasped, so as to obtain a communication link transmission signal that can better reflect the link quality.

[0101] Taking the signal transmitted through the communication link as the basis for judging whether the control center has successfully received the fault section information can effectively determine the effectiveness of information transmission. By comparing the signal transmitted through the communication link with the threshold value in the database, an effective early warning mechanism can be established. When the signal transmitted through the communication link is lower than the threshold value, it can be timely discovered that the fault section information has not been successfully received by the control center, thereby realizing early warning, and ensuring that when the control center fails to receive the fault section information, retransmission can be carried out in a timely manner.

[0102] The signal transmitted through the communication link is:

[0103]

[0104] In the formula, δ is the signal transmitted through the communication link, sy is the transmission delay of the communication link, dk is the network bandwidth of the communication link, dbl is the packet loss rate of the communication link transmission, μ1 is the compensation factor for the set sy, μ2 is the compensation factor for the set dk, and μ3 is the compensation factor for the set dbl.

[0105] The transmission delay reflects the timeliness of information transmission, the network bandwidth determines the transmission capacity and speed, and the packet loss rate of transmission reflects the reliability of transmission. The transmission delay, network bandwidth, and packet loss rate of the communication link are three key factors for measuring the performance of the communication link. By calculating the signal transmitted through the communication link with these three factors, the comprehensive impact of them on information transmission can be considered comprehensively. The calculated signal transmitted through the communication link quantifies the performance of the communication link, making the judgment of the effectiveness of information transmission more accurate, and providing a scientific basis for evaluating whether the control center can successfully receive the fault section information.

[0106] In a specific embodiment, fault monitoring terminals are reasonably deployed at the branch points of the collector line, the busbar of the step-up substation, and the end of the branch line. The distribution line is divided into several sections, and the monitoring terminals are marked as monitoring terminal 1, monitoring terminal 2, monitoring terminal 3,....., monitoring terminal n. The air salt mist concentration in the offshore wind farm is 5 milligrams per cubic meter, the corrosion area ratio of the monitoring terminal shell is 0.2 (20%), the corrosion number ratio of the monitoring terminal connection parts is 0.3 (30%), the compensation factor for the air salt mist concentration in the offshore wind farm is 0.5, the compensation factor for the corrosion area ratio of the monitoring terminal shell is 0.4, and the compensation factor for the corrosion number ratio of the monitoring terminal connection parts is 0.3. Calculate the corrosion influence factor for traveling wave fault section location as 0.8365.

[0107] The wind speed of the offshore wind farm is 15 meters per second, the average wave height of the offshore wind farm is 3 meters, the impact force of wind and waves on the monitoring terminal is 500 Newtons, the compensation factor for the wind speed of the offshore wind farm is 0.3, the compensation factor for the average wave height of the offshore wind farm is 0.2, the compensation factor for the impact force of wind and waves on the monitoring terminal is 0.1. Calculate that the operation status analysis factor of the monitoring terminal is -0.7835, which is less than the operation status analysis threshold 0 of the monitoring terminal. The operation status of the monitoring terminal is unreliable, and an unreliable warning prompt should be issued and it should be replaced.

[0108] The electric field strength of the offshore wind farm is 300 volts per meter, the magnetic field strength of the offshore wind farm is 0.5 amperes per meter, the harmonic ratio of the offshore wind farm is 0.05 (5%), the compensation factor for the electric field strength of the offshore wind farm is 0.2, the compensation factor for the magnetic field strength of the offshore wind farm is 0.1, the compensation factor for the harmonic ratio of the offshore wind farm is 0.05. Calculate that the electromagnetic influence factor for traveling wave fault section location is 0.797, which is greater than the electromagnetic influence threshold for traveling wave fault section location of 0.5, so the traveling wave fault section location signal is reliable.

[0109] Obtain the initial traveling wave current polarities of each adjacent monitoring terminal. Based on the initial traveling wave current polarities of each adjacent monitoring terminal, compare the initial traveling wave current polarities felt by two adjacent monitoring terminals to determine the fault section. It is obtained that the initial traveling wave current polarities of monitoring terminal 3 and monitoring terminal 4 are opposite, so the section between monitoring terminal 3 and monitoring terminal 4 is the fault section of the offshore wind farm collector line.

[0110] The transmission delay of the communication link is 0.5 seconds, the network bandwidth of the communication link is 10 megabits per second, the packet loss rate of the communication link transmission is 0.02 (2%), the compensation factor for the transmission delay of the communication link is 0.4, the compensation factor for the network bandwidth of the communication link is 0.3, the compensation factor for the packet loss rate of the communication link transmission is 0.1. Calculate that the transmission signal of the communication link is 0.7078, which is greater than the transmission threshold of the communication link of 0.5, so the control center successfully receives the information of the fault section of the offshore wind farm collector line.

[0111] Refer to Figure 2As shown in the figure, the present invention provides a traveling wave fault section location system for a collector line of an offshore wind farm, which includes a location corrosion influence factor acquisition module, a fault section determination module, and a fault section information reception and judgment module. Among them: The location corrosion influence factor acquisition module is used to analyze the seawater corrosion state of the collector line of the offshore wind farm to obtain the traveling wave fault section location corrosion influence factor. The fault section determination module is used to analyze the wave impact state of the collector line of the offshore wind farm, and combine the traveling wave fault section location corrosion influence factor to judge whether the operation state of the monitoring terminal is reliable: if the operation state of the monitoring terminal is not reliable, an unreliable warning prompt is issued for the operation state of the monitoring terminal; if the operation state of the monitoring terminal is reliable, the electromagnetic interference state of the collector line of the offshore wind farm is analyzed to obtain the traveling wave fault section location electromagnetic influence factor, and judge whether the traveling wave fault section location signal is reliable: if the traveling wave fault section location signal is not reliable, an unreliable warning prompt is issued for the traveling wave fault section location signal; if the traveling wave fault section location signal is reliable, the initial traveling wave current polarities of each adjacent monitoring terminal are obtained, and based on the initial traveling wave current polarities of each adjacent monitoring terminal, the fault section of the collector line of the offshore wind farm is determined. The fault section information reception and judgment module is used to analyze the communication link of the fault section of the collector line of the offshore wind farm to judge whether the control center has successfully received the fault section information of the collector line of the offshore wind farm.

[0112] Figure 3 It is a schematic structural diagram of a traveling wave fault section location system for a collector line of an offshore wind farm in an embodiment of the present invention. This embodiment corresponds to Figure 1 the traveling wave fault section location method for the collector line of the offshore wind farm, as Figure 3 shown, the traveling wave fault section location system for the collector line of the offshore wind farm in this embodiment may include:

[0113] A location corrosion influence factor calculation module 301, which is used to obtain the seawater corrosion state data of the collector line of the offshore wind farm, and further obtain the traveling wave fault section location corrosion influence factor;

[0114] A monitoring terminal operation state analysis factor calculation module 302, which is used to construct a monitoring terminal operation state analysis factor based on the wave impact state data of the collector line of the offshore wind farm and the traveling wave fault section location corrosion influence factor;

[0115] An operation state and location signal reliability judgment module 303, which is used to judge whether the operation state of the monitoring terminal is reliable according to the comparison result between the monitoring terminal operation state analysis factor and the set monitoring terminal operation state analysis factor threshold; when the operation state of the monitoring terminal is reliable, based on the electromagnetic interference state data of the collector line of the offshore wind farm, obtain the traveling wave fault section location electromagnetic influence factor, and then compare it with the preset electromagnetic influence factor threshold to judge whether the traveling wave fault section location signal is reliable;

[0116] The collector line fault section location module 304 is configured to obtain the initial traveling wave current polarities of adjacent monitoring terminals when the traveling wave fault section location signal is reliable, and determine the collector line fault section of the offshore wind farm based on the initial traveling wave current polarities of adjacent monitoring terminals.

[0117] It should be noted here that Figure 3 each module in the traveling wave fault section location system of the collector line of the offshore wind farm in Figure 1 corresponds one by one to each step in the traveling wave fault section location method of the collector line of the offshore wind farm in

[0118] Figure 4 is a schematic structural diagram of another traveling wave fault section location system for the collector line of an offshore wind farm in an embodiment of the present invention. Figure 3 On the basis of the structure of the traveling wave fault section location system for the collector line of the offshore wind farm, it further includes:

[0119] The fault section information reception success judgment module 305 is configured to analyze the communication link of the collector line fault section of the offshore wind farm and judge whether the control center successfully receives the collector line fault section information of the offshore wind farm.

[0120] It should be noted here that Figure 4 each module in the traveling wave fault section location system of the collector line of the offshore wind farm in Figure 2 corresponds one by one to each step in the traveling wave fault section location method of the collector line of the offshore wind farm in

[0121] When the central processing unit in the electronic device of this embodiment executes the program, it implements the steps in the traveling wave fault section location method for the collector line of the offshore wind farm as shown in Figure 1 shown.

[0122] Specifically, according to the embodiments of the present application, the process described above with reference to the flow chart can be implemented as a computer software program. For example, the embodiments of the present application include a computer program product, which includes a computer program carried on a computer-readable medium. The computer program includes program codes for executing Figure 1 or Figure 2 the method shown. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part and / or installed from a removable medium. When the computer program is executed by the central processing unit, it executes various functions defined in the device of the present application.

[0123] Among them, Figure 1 or Figure 2The computer program instructions corresponding to the methods shown can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory produce a manufactured article including an instruction device that implements the functions specified in one process or a plurality of processes and / or one block or a plurality of blocks in the flow. Figure 1 One process or a plurality of processes and / or Figure 1 One block or a plurality of blocks.

[0124] Those of ordinary skill in the art can understand that all or part of the processes of implementing the methods in the above embodiments can be completed by instructing relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM), etc.

[0125] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for locating the traveling wave fault section of the collector line of an offshore wind farm, characterized in that, Including: Obtain the seawater corrosion state data of the collector line of the offshore wind farm, and then obtain the corrosion influence factor for locating the traveling wave fault section; Based on the wind and wave impact state data of the collector line of the offshore wind farm and the corrosion influence factor for locating the traveling wave fault section, construct the analysis factor for the operating state of the monitoring terminal; According to the comparison result between the analysis factor for the operating state of the monitoring terminal and the set threshold of the analysis factor for the operating state of the monitoring terminal, determine whether the operating state of the monitoring terminal is reliable; when the operating state of the monitoring terminal is reliable, based on the electromagnetic interference state data of the collector line of the offshore wind farm, obtain the electromagnetic influence factor for locating the traveling wave fault section, and then compare it with the preset electromagnetic influence factor threshold to judge whether the signal for locating the traveling wave fault section is reliable; When the signal for locating the traveling wave fault section is reliable, obtain the initial traveling wave current polarities of each adjacent monitoring terminal, and based on the initial traveling wave current polarities of each adjacent monitoring terminal, determine the fault section of the collector line of the offshore wind farm.

2. The traveling wave fault section location method for the collector line of an offshore wind farm according to claim 1, characterized in that, The seawater corrosion state data of the collector line of the offshore wind farm includes the air salt mist concentration nd of the offshore wind farm, the corrosion area ratio fsm of the monitoring terminal housing, and the corrosion number ratio ljg of the monitoring terminal connection components; the corrosion influence factor for locating the traveling wave fault section is: Where α is the corrosion influence factor for locating the traveling wave fault section, σ1 is the compensation factor for the set nd, σ2 is the compensation factor for the set fsm, and σ3 is the compensation factor for the set ljg.

3. The traveling wave fault section location method for the collector line of an offshore wind farm according to claim 1, characterized in that The wind and wave impact state data of the collector line of the offshore wind farm includes the wind speed fs of the offshore wind farm, the average wave height lgo of the offshore wind farm, and the wind and wave impact force cjl received by the monitoring terminal; the analysis factor for the operating state of the monitoring terminal is: Where β is the analysis factor for the operating state of the monitoring terminal, α is the corrosion influence factor for locating the traveling wave fault section, τ1 is the compensation factor for the set fs, τ2 is the compensation factor for the set lgo, τ3 is the compensation factor for the set cjl, and e is the natural constant.

4. The traveling wave fault section location method for the collector line of an offshore wind farm according to claim 1, characterized in that The electromagnetic influence factor for locating the traveling wave fault section is: Where ω is the electromagnetic influence factor for locating the traveling wave fault section, dcq is the electric field intensity of the offshore wind farm, ccq is the magnetic field intensity of the offshore wind farm, xbb is the harmonic ratio of the offshore wind farm, ε is the compensation factor for the set dcq, ε2 is the compensation factor for the set ccq, and ε3 is the compensation factor for the set xbb.

5. The traveling wave fault section location method for the collector line of an offshore wind farm according to claim 1, characterized in that The method for locating the traveling wave fault section of the collector line of the offshore wind farm further includes: Analyze the communication link of the fault section of the collector line of the offshore wind farm to determine whether the control center successfully receives the information of the fault section of the collector line of the offshore wind farm.

6. The traveling wave fault section location method for the collector line of an offshore wind farm according to claim 5, characterized in that, Obtain the communication link data of the collector line of the offshore wind farm to obtain the communication link transmission signal; Judge whether the control center successfully receives the information of the fault section of the collector line of the offshore wind farm according to the communication link transmission signal; If the communication link transmission signal is not lower than the communication link transmission threshold, the control center successfully receives the information of the fault section of the collector line of the offshore wind farm; If the communication link transmission signal is lower than the communication link transmission threshold, the control center fails to successfully receive the information of the fault section of the collector line of the offshore wind farm, and the information of the fault section of the collector line of the offshore wind farm needs to be retransmitted.

7. The traveling wave fault section location method for the collector line of an offshore wind farm according to claim 6, wherein The communication link data of the collector line of the offshore wind farm includes the transmission delay of the communication link, the network bandwidth of the communication link, and the packet loss rate of the communication link transmission; the communication link transmission signal is: In the formula, δ is the communication link transmission signal, sy is the transmission delay of the communication link, dk is the network bandwidth of the communication link, dbl is the packet loss rate of the communication link transmission, μ1 is the compensation factor of the set sy, μ2 is the compensation factor of the set dk, and μ3 is the compensation factor of the set dbl.

8. A traveling wave fault section location system for a collector line of an offshore wind farm, characterized in that, It includes: A positioning corrosion influence factor calculation module, which is used to obtain the seawater corrosion state data of the collector line of the offshore wind farm, and then obtain the positioning corrosion influence factor of the traveling wave fault section; A monitoring terminal operating state analysis factor calculation module, which is used to construct a monitoring terminal operating state analysis factor based on the wind and wave impact state data of the collector line of the offshore wind farm and the positioning corrosion influence factor of the traveling wave fault section; An operating state and positioning signal reliability judgment module, which is used to judge whether the operating state of the monitoring terminal is reliable according to the comparison result between the monitoring terminal operating state analysis factor and the set monitoring terminal operating state analysis factor threshold; when the operating state of the monitoring terminal is reliable, based on the electromagnetic interference state data of the collector line of the offshore wind farm, obtain the positioning electromagnetic influence factor of the traveling wave fault section, and then compare it with the preset electromagnetic influence factor threshold to judge whether the positioning signal of the traveling wave fault section is reliable; A collector line fault section positioning module, which is used to obtain the initial traveling wave current polarities of each adjacent monitoring terminal when the traveling wave fault section positioning signal is reliable, and determine the fault section of the collector line of the offshore wind farm based on the initial traveling wave current polarities of each adjacent monitoring terminal.

9. The traveling wave fault section location system for the collector line of an offshore wind farm according to claim 7, characterized in that, The traveling wave fault section positioning system of the collector line of the offshore wind farm further includes: A fault section information reception success judgment module, which is used to analyze the communication link of the fault section of the collector line of the offshore wind farm to judge whether the control center has successfully received the fault section information of the collector line of the offshore wind farm.

10. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps in the traveling wave fault section positioning method of the collector line of the offshore wind farm described in any one of claims 1-7.

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