1528 results about "Submarine cable" patented technology

The invention discloses a submarine cable risk dynamic assessment method and system based on multi-modal deep learning, and belongs to the field of marine infrastructure operation and maintenance. Aiming at the problems of incomplete data coverage, unreal generated scene, low evaluation reliability and the like in the prior art, the method comprises the following steps of: 1) constructing a multi-source heterogeneous data set containing six types of data including geology, ocean, ships, biology and the like, and realizing data alignment by adopting space-time grid coding; 2) designing a physical constraint generative adversarial network, and generating risk scene data conforming to a fluid mechanics law through a Navier-Stokes equation constraint; 3) creating a hierarchical space-time fusion network (HST-Transform), and combining CNN spatial feature extraction, a time sequence attention mechanism and a dynamic memory module to realize multi-modal fusion; according to the method, the detection rate of rare risk events is increased by 62%, the evaluation accuracy rate reaches 91.7%, the false alarm rate is reduced by 34% compared with a traditional method, and submarine cable breakage accidents can be effectively prevented.

The invention discloses a cable insulation life prediction method and system based on LSTM accelerated aging mapping, and relates to the technical field of submarine cable insulation life prediction. The existing method has the defects of insufficient multi-stress nonlinear modeling, laboratory and field data separation, difficulty in small sample modeling and the like, and the insulation life of the submarine cable is difficult to accurately predict. The method comprises the following steps: data acquisition: acquiring parameters of insulation electrical performance, physical and chemical performance and mechanical performance under an accelerated aging condition; carrying out data preprocessing: carrying out homodromous processing on the inverse indexes, improving box plot denoising, filling missing data with a space-time K nearest neighbor algorithm, and carrying out normalization; constructing an LSTM model: embedding a dielectric constant differential equation as a physical constraint, and introducing an index weight; and model training and evaluation: adopting five-fold cross validation, and quantizing prediction precision through mean square errors and decision coefficients. According to the technical scheme, the prediction precision is improved, the fault risk caused by insulation aging is reduced, the maintenance cost is reduced, and the reliability of the ocean energy transmission system is improved.

The invention discloses a submarine cable fault online diagnosis and positioning method and system based on an optical fiber sensing technology, and relates to the technical field of optical fiber sensing, and the method comprises the steps: obtaining a real-time strain data flow of a submarine cable through a distributed optical fiber strain measurement device; carrying out space-time alignment and abnormal value correction processing on the original data set, and constructing a target data set; coordinate mapping is carried out on the target data set and a geographic information system of a submarine cable laying line, and a fault diagnosis layer with multi-dimensional visualization features is generated; an interactive fault analysis panel is generated on a geographic information system interface, and the deviation ratio between the strain theoretical threshold value and the actual measurement value of each monitoring point in the target data set is calculated; according to the submarine cable fault online diagnosis and positioning method and system based on the optical fiber sensing technology, rapid positioning of fault features is achieved, the fault response efficiency is improved, and long-term stable operation of a submarine communication network is ensured.

The invention provides a submarine cable with a large cross section and high heat dissipation performance. The submarine cable comprises an inner protection layer, a center assembly, a plurality of electric units, a plurality of power assemblies and a first heat dissipation assembly. An accommodating cavity is formed in the inner protective layer; the central component is positioned in the accommodating cavity; the plurality of electric units are located in the accommodating cavity, and the plurality of electric units are arranged around the central assembly; the multiple power assemblies are located in the containing cavity, the multiple power assemblies and the multiple electric units are correspondingly arranged, and the power assemblies are configured to enable the electric units to move towards or away from the inner protection layer; the first heat dissipation assembly is arranged around the periphery of the inner protection layer, and the first heat dissipation assembly is configured to dissipate heat of the electric units making contact with the inner protection layer through the inner protection layer.

The invention discloses a submarine cable shape monitoring method based on an ultra-weak fiber bragg grating, which comprises the following steps of: obtaining curvatures # imgabs0 #, # imgabs1 # and # imgabs2 # in X-axis and Y-axis directions from curvatures in two orthogonal directions of curvatures calculated by three uniformly distributed optical fibers, representing angle offset from an ith sensing unit to an X-axis positive direction, and obtaining a bending curvature, an arc angle and a direction angle; and coordinate information in the space is further obtained by combining rotation and translation matrix iterative calculation of a shape reconstruction algorithm, namely, three-dimensional space coordinates of the measured curve can be determined point by point, and finally, complete shape reconstruction and other steps are realized. According to the invention, high-precision large-scale three-dimensional deformation monitoring can be realized. By optimizing the eccentric distance and the strain transmission efficiency of the optical fiber, the tiny deformation of the submarine cable is accurately captured, and by combining an innovative three-dimensional curve reconstruction algorithm, the bending, inclination and other deformation states of the cable can be accurately reflected in different environments. Therefore, the method has obvious advantages in a monitoring task with a high-precision requirement, especially in a complex marine environment.

The invention relates to the technical field of submarine engineering and information processing, in particular to a submarine cable positioning method and system, and the method comprises the steps: synchronously collecting magnetic field, structured light and underwater acoustic signal data, and fusing inertial navigation information to construct a unified space-time reference system; precise registration of heterogeneous data is realized by adopting sliding time window screening, multi-modal noise reduction and rigid body transformation; constructing a graph structure model for expressing cable space-signal features based on the fused data, and reasoning cable path topology by using a graph convolutional network; reconstructing a cable center line through three-dimensional visualization, embedding the cable center line into submarine topography, and realizing risk area dynamic clustering by combining signal integrity score and burial depth estimation; historical time sequence data are fused, a long short-term memory network is adopted to predict cable drift, detectable attenuation and burial depth change trends, risk levels are divided based on prediction results, and spatial distribution early warning and disposal suggestions are output. According to the invention, the cable positioning precision and the risk assessment intelligent level in a complex seabed environment are improved.

The invention relates to the technical field of submarine cable fault positioning, in particular to a submarine cable fault positioning system based on underwater beacons. The method comprises the steps that an underwater acoustic beacon array unit monitors and collects submarine cable fault sound wave signals in real time based on underwater acoustic beacons; the fault signal processing analysis unit extracts submarine cable fault sound wave signal parameters based on a non-point source space sound source waveform analysis model, and generates multi-parameter fault sound source feature vectors; the sound source positioning analysis algorithm unit performs three-dimensional inversion positioning based on the multi-parameter fault sound source feature vector and the arrival time difference of the submarine cable fault sound wave signal to the underwater acoustic beacon, and obtains the spatial position information of the submarine cable fault point; and the data communication alarm management unit sends the spatial position information of the submarine cable fault point to a shore-based operation and maintenance system. The submarine cable fault positioning method is used for realizing a submarine cable fault positioning technology for quickly and accurately positioning and identifying spatial extension characteristics in a complex submarine environment.

The invention relates to a minimum bending radius multi-point turning action control method and system, and relates to the technical field of submarine cable laying, and the method comprises the steps: obtaining cable parameters of a cable, cable laying ship parameters of a cable laying ship, and marine environment parameters; analyzing the cable parameters, the cable laying ship parameters and the marine environment parameters to generate a predicted bending radius; analyzing the cable parameters to determine the minimum bending radius; judging whether the predicted bending radius meets the requirement of the minimum bending radius or not; if yes, the cable parameters of the cable, the cable laying ship parameters of the cable laying ship and the marine environment parameters are continuously obtained for cyclic judgment; if not, analyzing the predicted bending radius and the minimum bending radius to generate a bending radius error; analyzing the bending radius error to generate a speed adjustment amount; and the cable laying ship is adjusted according to the speed adjustment amount so that the predicted bending radius can meet the requirement of the minimum bending radius. The method has the effect of improving the timeliness of adjusting the bending radius.

The invention discloses a submarine cable insulation performance online monitoring and fault positioning method, a medium and equipment. The method comprises the following steps: S1, synchronously acquiring multi-source sensing data in real time; s2, multi-modal noise cooperative suppression and feature extraction; s3, insulation state degradation evaluation based on multi-feature fusion; s4, double-end traveling wave accurate fault positioning is carried out; and S5, carrying out data visualization and alarm linkage. According to the invention, marine complex environmental noise interference can be effectively suppressed, key parameters representing the insulation state of the submarine cable are monitored in real time in a multi-dimensional manner, and early warning of insulation degradation and preliminary judgment of a fault mode are realized through an intelligent fusion evaluation model. And the improved traveling wave accurate capture and wave velocity dynamic correction technology is utilized to realize accurate positioning of a fault point, so that the accuracy and sensitivity of submarine cable state monitoring and the fault positioning precision can be remarkably improved, and powerful technical support is provided for safe and economical operation of submarine cables.

The invention discloses a submarine cable laying path planning method and system capable of avoiding risks in the whole course, and the method comprises the steps: carrying out the rasterization of submarine elevation information, deleting a risk grid unit, and obtaining the grid unit data of a to-be-laid submarine cable region; determining a submarine cable laying starting point grating unit according to the submarine cable laying starting point coordinate, determining a submarine cable laying terminal point grating unit according to the submarine cable laying starting point coordinate, and representing a submarine cable laying path by a continuous grating unit sequence comprising the submarine cable laying starting point grating unit and the submarine cable laying terminal point grating unit; the submarine cable laying path is iteratively optimized by adopting a multi-objective optimization algorithm, and the optimized submarine cable laying path with low laying cost is obtained while the laying risk is controlled. According to the method, the comprehensive objective function considering the whole-course topographic relief and the local slope risk is combined, the whole-course risk and cost of the submarine cable laying path are subjected to multi-objective optimization, and the problem that the submarine cable laying cost is greatly increased or the whole-course reliability is reduced due to the fact that a local risk area is directly avoided is solved.

The invention belongs to the technical field of submarine cables, and provides a high-voltage three-core submarine cable. Comprising a cable core, a waterproof layer, an inner sheath, an armor layer and an outer sheath, the cable core comprises at least one conductive core, the conductive core comprises a conductor and an insulation system arranged outside the conductor, the insulation system comprises a conductor shielding layer, an insulation layer and an insulation shielding layer, and the conductivity of the conductor shielding layer is gradually reduced from inside to outside in the radial direction of the conductive core; the conductivity of the insulation shielding layer is gradually reduced from outside to inside in the radial direction of the conductive core. The contact interface of the conductor shielding layer and the insulating layer prevents charge from gathering at the interface, and the electric field distribution between the conductor shielding layer and the insulating shielding layer is greatly optimized; similarly, the electric conductivity of the insulation shielding layer is set to be gradually increased in the direction away from the insulation layer, the interface electric field between the insulation layer and the insulation shielding layer is optimized, electric charges on the interface of the insulation layer can be rapidly led to the insulation shielding layer, and the partial discharge phenomenon is prevented.

The invention relates to the technical field of cable monitoring, in particular to a power cable damage monitoring system and method based on a digital twin model, and the system comprises a data collection module, an optical calculation processing module, a terahertz radar detection module, a digital twin modeling module and an underwater communication module. The optical calculation processing module performs high-frequency parallel processing on the acquired environmental data to generate a three-dimensional damage map of the submarine cable; the terahertz radar detection module obtains echo signals of a submarine cable insulation layer and extracts insulation aging state information. The digital twinborn modeling module constructs a cable digital twinborn model based on the three-dimensional damage map and the aging information, and predicts a fault diffusion path; and the underwater communication module transmits the model data to a target receiving end. According to the system, the insulation aging detection precision and the real-time prediction capability of the submarine cable are improved, and the intelligence and the engineering applicability of the system are enhanced.

The invention discloses an offshore wind power collecting and sending-out system and method based on a multi-port multi-frequency alternating current and direct current hybrid integrated platform, and belongs to the field of power transmission and distribution of power systems. The system comprises an intermediate-frequency, power-frequency and low-frequency wind power collection subsystem, an offshore integrated platform, a direct-current sending-out submarine cable, a low-frequency sending-out submarine cable, an onshore converter station and an onshore frequency conversion station. The various wind power collection subsystems respectively collect wind turbine generator group outputs with corresponding frequencies and send the wind turbine generator group outputs to the offshore integrated platform; the offshore integrated platform converts intermediate-frequency, power-frequency and partial low-frequency electric energy into direct current and then transmits the direct current to the onshore converter station through the direct-current sending-out submarine cable, and the converter station converts the direct current into power-frequency alternating current; and after being boosted, the other low-frequency electric energy is sent to a land frequency conversion station through a low-frequency sending-out submarine cable to be converted into power-frequency alternating current, so that efficient collection and grid-connected sending-out of multi-frequency wind power resources are realized. According to the invention, the problem that a plurality of independent platforms need to be built in a complex multi-point grid-connected scene in the prior art can be solved.

The invention discloses a high-voltage direct-current submarine cable test system and method, and relates to the field of high-voltage direct-current submarine cable test, and the method comprises the steps: constructing a simulated seabed test space with a multidirectional water flow impact device, and arranging a curvature adjustment mechanism capable of actively changing the bending form of a submarine cable sample; collecting submarine cable insulation layer temperature and bending form data in real time in a test process under a simulated seabed test space condition, dynamically establishing an association relationship between the two data, and tracking the association relationship to a limit state; through collaborative analysis of temperature gradient distribution and charge peak-to-valley ratio characteristics, the safety boundary and the limit failure state of the submarine cable are judged through continuous growth of the temperature gradient and synchronous deterioration of the charge peak-to-valley ratio in combination with indexes such as outer sheath carbonization and temperature difference sudden change. The comprehensive evaluation of the performance of the submarine cable under the extreme condition is realized, and a powerful technical guarantee is provided for improving the reliability and the safety of a cable system.

A submarine cable core comprising a conductor which is surrounded by at least an inner semiconductive layer, an insulation layer and an outer semiconductive layer in that order; wherein said insulation layer comprises: a low density polyethylene homopolymer or low density polyethylene copolymer with at least one polyunsaturated comonomer and optionally one or more further comonomers; and, a copolymer comprising at least one polar comonomer selected from the group consisting of an alkyl acrylate, an alkyl methacrylate or vinyl acetate, wherein the amount of polar monomer units in the insulation layer is from 1 to 150 micromol per gram based on the total amount of polymer components in the insulation layer.

The invention discloses a submarine cable laying device, comprising a device body, a connecting rod welded to the top of the device body, a connecting chain fixed to the connecting rod, a first guide frame arranged on one side of the connecting rod, and the device can process sediment on a submarine cable trough while laying the submarine cable, so that the submarine cable can be laid more evenly and laid on a straight line in a submarine pre-buried trough, and the laid cable can be covered with sediment to protect it, so as to prevent the flow of seawater on the submarine and cause the laid cable to deviate from the laying trough, and the cable can be easily fixed, so as to solve the problem of traditional laying method, and the method has high efficiency and high speed, and the stability performance of the device on the seabed is increased by braking the crawler and tire at the same time, and a drill and a bucket are arranged at one end of the device, so as to clean the sediment and some gravel in the submarine laying trough, so as to ensure the safe and effective laying of the submarine cable.

The invention relates to the technical field of alternating-current and direct-current sending-out systems. The sea-land multi-source multi-terminal alternating current and direct current integrated system is composed of a land multi-source energy sending-out system, an offshore wind power alternating current collection and direct current sending-out system, an inland receiving end power grid, an inland receiving end collection bus, an inland receiving end commutation platform, an inland receiving end system of an inland receiving end direct current overhead line and an integrated switching station. The land multi-source energy sending-out system comprises a multi-source energy cluster, a land sending end power grid, a land sending end collection bus, a land sending end current conversion platform and a land sending end direct current overhead line. The offshore wind power alternating current collecting and direct current sending-out system comprises an offshore wind power plant, an alternating current collecting network, an offshore current conversion platform and a direct current submarine cable. According to the method, on the basis of coordination control of offshore wind power lightweight output combined with offshore wind power and onshore multi-source energy collection, the offshore wind power transmission cost is remarkably reduced, the utilization rate of a power transmission channel is increased, offshore wind power output fluctuation is stabilized, and the absorption capacity of a power grid to offshore wind power is improved.

The utility model relates to a submarine cable flexible joint forming die, which is used for insulating extrusion and crosslinking at the joint of conductors of two sections of cables, and comprises a forming device which is provided with a die cavity, the joint of the conductors of the two sections of cables is located in the die cavity, and the inner walls of the two ends of the forming device abut against the outer surfaces of the cables in a sealing manner; the feeding device is arranged at one end of the forming device, the feeding device is provided with a feeding channel, a connecting channel and an annular channel, and the connecting channel communicates with the feeding channel and the annular channel; the sealing device is arranged on the forming device and communicated to the mold cavity, and the sealing device can seal or open the mold cavity; the size of the end, communicated with the feeding channel, of the connecting channel is smaller than that of the end connected with the annular channel. Therefore, the crosslinked polyethylene can uniformly coat the outer side of the conductor joint in the extrusion process, the crosslinked polyethylene melt is ensured to be crosslinked and vulcanized in a sealed environment, the forming quality of the submarine cable flexible joint is ensured, and the crosslinking and vulcanization efficiency and quality are improved.

The invention, which relates to the technical field of direct-current power transmission, discloses a co-offshore medium-high-frequency alternating-current offshore wind power full-direct-current collection system comprising: an offshore wind turbine module, which is used for obtaining offshore medium-voltage direct-current electric energy; the multi-port direct-current voltage transformation module is used for converting the offshore medium-voltage direct-current electric energy into offshore high-voltage direct-current electric energy; the direct-current submarine cable module is used for gathering the offshore high-voltage direct-current electric energy, acquiring the gathered offshore high-voltage direct-current electric energy and transmitting the gathered offshore high-voltage direct-current electric energy to the shore converter station module; the shore converter station module is used for acquiring shore high-voltage alternating-current electric energy according to the collected offshore high-voltage direct-current electric energy; the onshore alternating current module is used for receiving the onshore high-voltage alternating current electric energy and achieving full-direct-current collection of offshore wind power. By improving the medium voltage-high voltage direct current transformer topological structure and the control method, efficient and economical electric energy transmission is realized, the construction economy and the engineering application value of an open-sea wind power collection system are improved, and the average price and low price requirements of marketization development are met.

The utility model relates to a submarine cable state on-line monitoring system, which belongs to the technical field of cable protection equipment and comprises a submarine cable temperature monitoring module, a submarine cable breakdown fault response module, a submarine cable surrounding environment monitoring module, a marine monitoring ship body, a submarine cable environment display module and a submarine cable GIS module. Two supports are fixedly installed at the top end of the marine monitoring ship body, and a wireless signal transceiver is fixedly installed at the top of the marine monitoring ship body. The device has the beneficial effects that the two U-shaped frames can be driven to move in the same direction or opposite directions through the rotation of the two-way screw rod, and then the canopy outside the U-shaped frames can be driven to unfold, so that each part on the marine monitoring ship body is prevented from being eroded by rainwater or severe weather, and the service life of the marine monitoring ship body is prolonged. And therefore, protection can be provided for components on the marine monitoring ship body, and the service life of the components on the marine monitoring ship body can be prolonged.

The invention belongs to the technical field of power transmission and distribution of a power system, and particularly discloses a DR-MMC alternating-current and direct-current hybrid grid-connected system single-pole grounding fault ride-through method. The DR-MMC alternating-current and direct-current hybrid grid-connected system is constructed based on an offshore alternating-current wind power plant, an alternating-current collection submarine cable, an offshore direct-current wind power plant, a direct-current collection submarine cable, an offshore converter station, a direct-current sending-out submarine cable and an onshore converter station, and a connecting transformer valve side winding of the onshore converter station adopts high-resistance grounding. Judging whether the direct-current submarine cable has a single-pole grounding fault or not; and reducing the voltage instruction value and the power instruction value under the condition that the single-pole grounding fault occurs in the direct-current submarine cable, so that the transmission power of the grid-connected system is maintained at the preset transmission power, and the voltage and the current of the grid-connected system are maintained in a safe range. For a DR-MMC alternating current and direct current hybrid grid-connected system single-pole grounding fault, efficient and reliable fault ride-through can be realized through the method and the device.

The invention relates to the technical field of submarine cable fault detection, in particular to a submarine cable fault detection system. The method comprises the steps that an adjustable low-frequency pulse injection unit injects a low-frequency pulse excitation signal and collects a response signal generated by a submarine cable fault; the multi-source signal fusion acquisition unit acquires a reflected voltage signal, an acoustic signal and a leakage magnetic field signal, and constructs a multi-modal fusion response characteristic matrix; the intelligent broadband noise suppression unit is used for performing noise suppression processing on each modal sub-matrix to obtain a de-noised multi-modal fusion response characteristic matrix; and the intelligent fault positioning interpretation unit is used for constructing a three-dimensional signal fingerprint spectrogram, performing classification analysis on fault events based on a fuzzy clustering algorithm and a depth feature matching model to obtain a fault type, and performing calculation through a path residual fitting method to obtain a fault position. The invention realizes a detection system which does not depend on a special cable structure, can actively excite and fuse multi-source signals, and can position submarine cable faults at high precision.

The invention discloses a submarine cable fault positioning simulation verification system and a calibration method thereof, and belongs to the technical field of submarine cable detection. According to the system, a multi-source sensor array is deployed for data acquisition, and a multi-stage adaptive noise reduction algorithm, a time-frequency domain feature fusion technology and a land-sea environment electromagnetic field mapping model are adopted, so that magnetic field distribution features of a submarine cable in an actual marine environment can be simulated with high fidelity, and accurate positioning of a fault position is realized. By establishing a standardized calibration process, effective migration of simulation data and marine measured data is ensured, and the technical problems of complex marine noise interference and extrapolation distortion of a laboratory environment verification result are effectively solved. The scheme has the remarkable advantages of high positioning precision, strong anti-interference capability, accurate environment mapping and the like.

The utility model discloses a high-pressure-difference submarine cable cabin-penetrating sealing structure for testing a wet-type electric connector, which belongs to the technical field of submarine cable cabin-penetrating sealing and comprises a pressure vessel cabin wall, a cabin wall flange is arranged in the pressure vessel cabin wall, a screw is arranged on the surface of the cabin wall flange, a submarine cable body is arranged in the cabin wall flange, and the submarine cable body is connected with the cabin wall flange. V-group compression nuts are arranged at the two ends of the bulkhead flange, a V-group pressure pad is arranged in the bulkhead flange corresponding to the submarine cable body, and a V-group support ring is arranged on one side of the V-group pressure pad; according to the utility model, the V-group pressure pads, the V-group support rings, the V-shaped seals and the V-group pressure rings are tightly attached to the submarine cable, so that high-pressure-difference sealing is realized, the combination direction of the V-group seals can be determined according to the water pressure direction, and the high pressure difference is realized by adjusting the number of single V-shaped seals through different pressure differences; the problem of unsafe factors in the test of the cabin-penetrating sealing structure which cannot bear high pressure difference in the prior art is solved, and the test operation risk is reduced.

The invention discloses an intelligent management system for submarine cable recovery of an offshore wind plant, which belongs to the technical field of submarine cable recovery, and comprises a multi-source sensor data acquisition module comprising a shipborne meteorological sensor, a multi-source sensor array deployed on a recovery ship, and a streaming data processing module; the incremental online learning module comprises a lightweight neural network and an elastic weight solidification unit; the dynamic weight decision-making module is used for dynamically distributing weights based on multi-modal feature information entropy, outputting a cable residual value grade and supporting misjudgment case feedback optimization; and the edge cloud collaboration module receives the incremental update package issued by the cloud. According to the intelligent management system for recovery of the submarine cable of the offshore wind plant, real-time assessment and residual value judgment of cable damage are realized through a full-process closed loop of multi-modal data acquisition, dynamic noise suppression, incremental learning updating, intelligent decision and cloud collaborative optimization.

The invention discloses a submarine cable construction ship extremely-short-term motion response prediction method and system, and relates to the technical field of ship motion control in ocean engineering. Comprising the following steps: acquiring six-degree-of-freedom time sequence data based on a ship-borne inertial measurement unit of a submarine cable construction ship, and constructing a data set; the data set is preprocessed; constructing a model CNN-RSBU-BiLSTM (Convolutional Residual Shrinkage-Bidirectional Long Short Term Memory) with fusion of the convolutional residual shrinkage; the model CNN-RSBU-BiLSTM is trained by means of the data set obtained after preprocessing is carried out on the model CNN-RSBU-BiLSTM; and inputting the six-degree-of-freedom time sequence data acquired and preprocessed in real time into the trained model, and outputting an extremely short-term six-degree-of-freedom motion response prediction result of the submarine cable construction ship. According to the method, the multi-scale feature extraction capability of the one-dimensional convolutional neural network, the noise reduction enhancement effect of the residual shrinkage building unit and the digging capability of the bidirectional long-short-term memory network on the time sequence dependency relationship are combined, so that accurate prediction of the extremely-short-term six-degree-of-freedom motion response of the submarine cable construction ship is realized, and the prediction accuracy is effectively improved.

The invention relates to the technical field of submarine cable engineering equipment, and discloses a submarine cable bending limiter failure analysis method and system, and the method comprises the steps: constructing a large-scale wave water tank experiment system; a wave flow test is carried out in a large-scale wave water tank experiment system, and three-dimensional terrain evolution data of a scouring pit formed at the single-pile foundation model and dynamic strain response and displacement of the submarine cable bending limiter model are obtained; constructing a hydrodynamic force-sediment transportation-submarine cable motion coupling numerical model according to the three-dimensional terrain evolution data, the dynamic strain response and the displacement; and according to the hydrodynamic force-sediment transportation-submarine cable motion coupling numerical model and different hydrodynamic force conditions, the quantitative relation between the scour range extension and the failure threshold value of the submarine cable bending limiter is determined. According to the scheme, the tensile stress and bending response change rule of the submarine cable and the bending limiter can be quantitatively analyzed, and reference is provided for optimal design and protection of the offshore wind power pile foundation submarine cable bending limiter.

The invention discloses a combined bending protection device based on dynamic design, and relates to the technical field of submarine cable protection. Oyster reefs are arranged around the protection device, the protection device comprises a J-shaped pipe, a center clamp, a conical pipe and a bending limiter which are sequentially connected, one end of the center clamp is connected with the J-shaped pipe, and the other end of the center clamp is connected with the bending limiter through the conical pipe. The bending limiter comprises a plurality of bending limiting units connected in sequence, each bending limiting unit comprises two bending limiting single bodies, one side of each bending limiting single body is provided with a rotating protruding block, the other side of each bending limiting single body is provided with a rotating groove, and the rotating protruding blocks are rotationally connected with the rotating grooves. Through cooperation of the J-shaped pipe, the conical pipe and the bending limiting device, the stress concentration problem can be effectively relieved, the protection performance of the submarine cable in a complex dynamic environment is enhanced, the construction efficiency is remarkably improved through cooperation of the rotating protruding block and the rotating groove, meanwhile, the submarine cable can be prevented from being scoured through cooperation of the protection device and the oyster reef, and the service life of the submarine cable is prolonged. The method has good protective property and ecological property, and can generate economic benefits.

The invention discloses a deep and far sea wind power direct current delivery system based on a flexible thyristor converter and a control method. The deep and far sea wind power direct current delivery system based on the flexible thyristor converter comprises a plurality of offshore wind power direct current delivery systems, a direct current large bus, an onshore converter station and an onshore alternating current power grid. The offshore wind power direct current sending-out system is composed of a wind power plant, a collection network, an offshore converter station and a direct current submarine cable which are connected in sequence. The land converter station is composed of an alternating current line, a land converter and a direct current line which are connected in sequence. The invention discloses a deep and far sea wind power direct current delivery system topological structure and a control method, which can realize concentrated collection and high-capacity delivery of receiving ends of a plurality of long-distance offshore wind fields, deeply utilize complementarity of power fluctuations of the plurality of offshore wind fields, improve construction economy of a deep and far sea wind power grid-connected delivery system and annual utilization hours of a direct current delivery channel, and reduce the construction cost of the deep and far sea wind power grid-connected delivery system. And the flexibility and expansibility of the grid-connected system are effectively enhanced.

The invention discloses a dynamic submarine cable three-dimensional reconstruction method and device, electronic equipment and a storage medium, which are used for solving the technical problem of failure of three-dimensional reconstruction of a dynamic cable caused by low shape sensing accuracy and stability of the dynamic submarine cable in the prior art. The method comprises the following steps: firstly, calculating a strain value of each fiber core in the multi-core optical fiber based on spectral drift, and performing characteristic curvature vector inverse solution by combining the strain value of each fiber core to obtain a discrete bending direction set and a discrete curvature set; respectively carrying out discrete fitting on the discrete bending direction set and the discrete curvature set until the bending direction and the optical fiber curvature at each position in the multi-core optical fiber are fitted; the optical fiber torsion is solved according to the bending direction, a space curve is solved based on the optical fiber curvature and the optical fiber torsion, and the space curve corresponds to the axis track of the multi-core optical fiber; and finally, performing three-dimensional reconstruction on the submarine cable according to the axis track to obtain the three-dimensional shape of the submarine cable.