1048 results about "Submarine cable" patented technology

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 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 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 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.

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 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 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 hybrid submarine cable system maintenance, in particular to a reactive compensation method, system and device for a hybrid submarine cable system and a medium, and the method comprises the steps: obtaining the standard electrical parameters of an oil-filled submarine cable and an XLPE submarine cable; constructing an electromagnetic transient simulation model of the hybrid submarine cable system; calculating an ideal reactance compensation range; a plurality of groups of series reactance compensation schemes are set and applied in the electromagnetic transient simulation model, and three-phase transmission power distribution, total transmission power and voltage unbalance degree under each series reactance compensation scheme are simulated and calculated; comparing simulation results of each series reactance compensation scheme, and selecting the series reactance compensation scheme with the maximum total transmission power on the premise that the three-phase power unbalance degree is lower than a preset equilibrium constraint condition as an optimal compensation scheme; an optimal compensation scheme is applied in a hybrid submarine cable system. According to the invention, three-phase power balance and total transmission power maximization of the hybrid submarine cable system can be realized at the same time.

The invention discloses a dynamic submarine cable response extremum prediction method and device fusing a physical mechanism and a dynamic time sequence characteristic, and the method comprises the steps: deeply fusing a dynamic submarine cable control equation and data driving training through a physical information neural network, and converting the mechanical mechanism of a dynamic submarine cable into a residual constraint term; the defect of poor generalization of a pure data driving method is overcome; amplitude characteristics of six-degree-of-freedom motion of the floating body are extracted through an LSTM time sequence prediction model, and a long time sequence dynamic coupling effect is compressed into physical interpretable characteristics; a structure type judgment module is designed, so that two types of mainstream submarine cable structures can be covered without reconstructing the model, and the engineering applicability is greatly enhanced; dynamically balancing data fitting loss, physical residual loss and motion prediction loss by adopting a time-varying weight strategy, accelerating convergence and ensuring that a prediction result accords with a physical rule; dynamic submarine cable strength failure early warning is provided for offshore wind power by outputting key node response extreme values and motion amplitude characteristics in real time, and the operation and maintenance cost of the offshore wind power is greatly reduced.

The invention discloses an offshore wind power cable monitoring and early warning system and method based on digital twinning, and relates to the technical field of digital twinning and industrial Internet of Things monitoring, and the system comprises a data collection module which is used for obtaining the real-time multi-dimensional sensing data of a submarine cable, and determining the real-time heat production power of the cable; the physical rule model module is used for outputting a theoretical prediction state; the data driving model module is used for outputting a data fitting state; the bidirectional dynamic coupling module is used for generating a mismatch judgment result for indicating cognitive mismatch or cognitive consistency; the model correction module is used for outputting a corrected theoretical prediction state; the state evaluation and early warning module is used for generating the comprehensive evaluation result; and comparing the comprehensive evaluation result and the change trend thereof with a preset multi-level risk threshold, and issuing early warning information. According to the method, the limitation of traditional physical model solidification can be broken through, self-correction is carried out when encountering extremely unknown working conditions, and effective insight and prevention of deep risks are achieved.

The invention provides an offshore wind plant area monitoring and early warning method and system based on multi-source information, and relates to the technical field of offshore wind plant safety monitoring. The method comprises the steps that pile foundation structure vibration response data, seabed terrain data, submarine cable tension data and marine environment parameters are collected through a multi-type sensor network; acquiring a biological optical response signal through the biological sensing monitoring unit; carrying out fusion processing on the multi-source information by adopting a multi-stage process including space-time registration, feature extraction, correlation mapping and conflict analysis to generate a comprehensive sensing result with credibility; trend deduction is carried out based on the neural network prediction analysis model, and prediction data of the pile foundation scouring depth and the submarine cable displacement are generated; and generating an early warning signal through an early warning level mapping mechanism and starting a response. Physical and biological response information is fused, and the accuracy, reliability and timeliness of monitoring and early warning are remarkably improved.

The invention discloses a submarine cable armored connecting device and an installation method thereof, and relates to the technical field of ocean engineering, the submarine cable armored connecting device comprises an anchoring unit and a stress transmission connecting rod unit, and the anchoring unit and the stress transmission connecting rod unit are rotatably connected; the anchoring unit comprises a shell and a conical anchoring sleeve, the shell is provided with a conical groove, the conical anchoring sleeve is arranged in the conical groove, and a clamping part is arranged on the inner wall of the conical anchoring sleeve. A shell with a conical groove and a conical anchoring sleeve with a clamping part are adopted in the anchoring unit, self-locking is achieved through the mechanical wedge-caulking principle, larger radial clamping force can be generated when the submarine cable tensile force is borne, the clamping part on the inner wall of the sleeve is embedded into an armor layer of a submarine cable more deeply, and the tensile force is effectively transmitted. The anchoring unit and the stress transmission connecting rod unit are rotationally connected, submarine cables on the two sides are allowed to be relatively bent and twisted within a certain range, bending stress concentration at a connecting point is remarkably reduced, and adaptability and reliability of the armored connecting device under complex sea conditions are improved.

The application discloses a submarine cable path detection device and method and a cable fault positioning method, and the detection device comprises a detection ship, a general control module, a rudder control module, a positioning and information transmission system, a cable path detection assembly, a fault detection assembly and a land centralized control center. The application applies low-frequency voltage to the fault of the submarine cable, so that an alternating magnetic field is generated in the sea area around the cable, and the trend of the submarine cable is detected and judged, the technical defects that the submarine cable is inconvenient to maintain when the actual line deviates from the original laid line are overcome, time is saved, and efficiency is improved. The cable fault positioning method of the application quickly positions the fault point, overcomes the problems that the previous determination of the submarine cable fault point is time-consuming and labor-consuming, and the positioning accuracy of the fault point is not high, and improves the positioning accuracy and efficiency of the fault point.

The invention discloses an offshore wind power direct current networking system sharing an energy consumption device and a fault ride-through method, an offshore MMC current converter is connected through a direct current connection submarine cable at the direct current side of the offshore MMC current converter of the offshore wind power direct current networking system, and a direct current circuit breaker optimal configuration scheme is provided. According to the method, the direct current energy consumption device only needs to be configured on the direct current side of one offshore MMC converter, fault ride-through operation of the whole direct current networking system under different faults can be achieved through a coordination control strategy among the land MMC converter, the offshore MMC converter and the direct current energy consumption device, the construction cost of an offshore wind power direct current networking project is remarkably reduced, and the fault ride-through operation of the whole direct current networking system under different faults can be achieved. Good application prospects are realized.

The invention provides a submarine cable accurate positioning method and system based on a double-difference positioning reverse principle. The method comprises the following steps: arranging and sequentially exciting active seismic sources in a target sea area, acquiring backward Rayleigh scattering signals along a submarine cable by using a distributed optical fiber sound wave sensing system, and demodulating and preprocessing to obtain strain rate data; constructing a topological acoustic propagation model containing a nonlinear correction term, forming a topological acoustic mode when the excitation frequency falls into a topological band gap, and extracting a robust signal as input; calculating travel time difference based on double-difference reverse modeling and constructing a residual equation set, and obtaining a preliminary positioning result of the submarine cable by using a weighted resolving method; and path correction and iterative optimization are carried out in combination with topological acoustic model characteristics, so that a positioning result with higher precision can be obtained. According to the method, double-difference reverse modeling is introduced to be combined with topological acoustic model optimization, so that the submarine cable positioning precision and the anti-interference capability are remarkably improved, and the method is suitable for construction monitoring, operation and maintenance management and risk assessment of submarine cables.

The invention discloses a fault current calculation method and system for a high-voltage alternating-current submarine cable grounding system and a storage medium, and the method comprises the following steps: enabling a power supply device and an electric device to be equivalent to an impedance and series voltage source combination and a load impedance based on the Thevenin equivalence theorem; in combination with the double-end grounding characteristic, a submarine cable loop is equivalent according to a pi type, and a three-phase equivalent circuit is constructed; determining a fault phase, and dividing the submarine cable as a left side and a right side by a fault point; a voltage loop equation is listed based on the Kirchhoff theorem, and a matrix recursion rule is deduced in combination with a double-side elimination principle. And establishing an analytic relationship between the main sections of the submarine cables at the power side and the short-circuit side and the fault circulating current according to a recursion rule. And with a fault point current equation as a boundary condition, left sheath fault circulation distribution is solved simultaneously. And repeating the steps on the right side to obtain right side distribution so as to obtain fault phase whole-line distribution. According to the method, the circulation distribution can be accurately calculated, the fault analysis accuracy and efficiency are improved, and support is provided for submarine cable operation and maintenance and the like.

The embodiment of the invention relates to the field of power systems, and provides a collaborative design scheme generation method and device for submarine cable lightning overvoltage suppression and insulation cooperation based on a particle swarm optimization algorithm, computer equipment and a storage medium, and the method comprises the steps: carrying out the initial configuration of optimization basic data of a to-be-simulated experiment, constructing to obtain a simulation environment after initialization configuration; based on the simulation environment after initialization configuration, parallel electromagnetic transient program simulation is carried out so as to construct a bidirectional coupling framework simulation model of submarine cable lightning overvoltage suppression and insulation cooperation; and based on an improved hybrid particle swarm optimization algorithm, solving the bidirectional coupling framework simulation model to generate a collaborative design scheme corresponding to the submarine cable lightning overvoltage suppression and insulation cooperation process. By adopting the method, the overvoltage level of the submarine cable system and the technical implementation effect of insulation cooperation can be improved, and the safety of the system is improved.

The invention relates to an incremental learning CNN-Attention-based broadband impedance on-line identification method for a network construction type wind power plant, and belongs to the technical field of new energy grid connection, and the method comprises the following steps: S1, building a parallel collection type offshore wind power plant multi-machine dynamic equivalent model; s2, collecting and preprocessing parameters based on a multi-machine equivalent model of the network-building type wind power plant; s3, a CNN-Attention model is constructed and trained; s4, constructing an equivalent impedance model of the current collection submarine cable line between the wind turbine generators; s5, on the basis of the actual topology of the network construction type wind power plant station, connecting the broadband impedance models of the wind turbine generator and the current collection circuit into a frequency domain impedance network, and calculating the impedance characteristics of the current collection port of the multi-machine equivalent wind power plant; s6, a CNN-Attention model containing an incremental learning updating mechanism is constructed; and S7, performing broadband impedance on-line identification on the network construction type wind power plant.

The invention provides an underwater robot submarine cable inspection motion control method based on an image algorithm, and belongs to the technical field of image processing, and the method specifically comprises the steps: determining an inspection processing mode of a robot according to the historical uninspected data of a submarine cable behind a current inspection position, and carrying out the operation control processing of the robot in the inspection processing mode, the method comprises the following steps: determining a secondary inspection review area by utilizing an inspection processing mode, and when the composition condition of the secondary inspection review area meets requirements, determining the secondary inspection review area needing inspection review on the basis of inspection data of the secondary inspection review area of various inspection processing modes before the current position, and the inspection power consumption in an area with a complex environment is reduced.

The embodiment of the invention provides a submarine cable forming device, and relates to the field of submarine cables. The forming device comprises a supporting seat, the supporting seat comprises a base, a supporting rod, a first wire coil, a second wire coil and a third wire coil, the supporting rod is arranged on the base and extends in the vertical direction, the first wire coil and the second wire coil are located on the circumferential side of the supporting rod, and the second wire coil and the third wire coil are located on the same side of the supporting rod and arranged in the radial direction of the base; the cable positioning platforms are arranged on the supporting rod and are arranged on the upper side of the base at intervals; the cable twisting platforms are arranged on the supporting rod and are arranged on the upper side of the cable positioning platform at intervals; the shaping molds are arranged on the supporting rods and are arranged on the upper side of the cable twisting platform at intervals; and the cable wrapping assembly is used for wrapping the submarine cable assembly penetrating through the shaping mold with a cabling wrapping layer. The forming device of the submarine cable can improve the control of the tension of the optical cable and improve the stability in the twisting and paying-off process.

The invention discloses a component separation calculation method, system and device for grounding current of a high-voltage alternating-current submarine cable and a medium. The component separation calculation method comprises the steps that current transformers are additionally arranged on submarine cable bodies at the head end and the tail end of an on-site high-voltage alternating-current submarine cable, a metal sheath grounding wire and an armored grounding wire; acquiring the current monitoring quantity flowing through the current transformer; performing vector calculation on the current monitoring quantity to obtain submarine cable core current vectors, metal sheath grounding current vectors and armor layer grounding current vectors at the head end and the tail end; vector calculation is carried out on the current vectors to obtain capacitance current components and electromagnetic induction current components of metal sheath grounding current and armoring grounding current, and the capacitance current leakage proportionality coefficient of the metal sheath and the armoring and the electromagnetic induction current proportionality coefficient of a grounding loop are calculated by further combining the submarine cable core current vectors; therefore, the grounding loop state of the metal sheath and the whole armored wire of the submarine cable and the main insulation and sheath external insulation state of the submarine cable are monitored.

The invention discloses a deep and far sea wind power time-varying impedance model grid connection analysis method based on a time domain residual error method, relates to the technical field of power system modeling simulation, and can efficiently and accurately analyze deep and far sea wind power grid connection. The method comprises the following steps: establishing a differential algebraic equation set containing high-capacity submarine cable impedance and a plurality of nonlinear links, and constructing a recursive coefficient matrix; dividing a preset global time domain into a plurality of time domain subintervals, and solving the recursion coefficient matrix in each time domain subinterval by referring to a universal analytic solution represented by a power series explicit operator to generate a global time domain explicit solution corresponding to the preset global time domain; performing discrete Fourier transform on the global time domain explicit solution to obtain a time-frequency domain spectrum result; and constructing a time-varying impedance model according to the differential algebraic equation, setting the time-varying impedance model by adopting a time-frequency domain spectrum result, and analyzing the deep and far sea wind power grid-connected control system by utilizing the set time-varying impedance model.

The invention discloses an offshore wind plant monitoring system based on a digital twin and grid-connected architecture and a design method thereof. The system comprises a field layer, an intermediate network communication layer and a station control and centralized control layer, the field layer comprises a fan monitoring subsystem, a booster station monitoring subsystem, a video monitoring subsystem, an environment monitoring subsystem, a power prediction subsystem and a submarine cable fault monitoring subsystem; the intermediate network communication layer comprises an SDH communication node and a longitudinal encryption device; the station control and centralized control layer comprises an integrated intelligent monitoring management platform and a digital twinborn model, the digital twinborn model is constructed based on collected data of the field layer and covers multi-dimensional information and functional sub-models of the wind power plant, and the integrated intelligent monitoring management platform stores a functional component library and can call the functional component library to realize monitoring and control functions; and the system can be tested and optimized. The system has the advantages of being high in integration level, intelligent and efficient in operation and maintenance, adaptive to different grid-connected frameworks, capable of fusing static design and dynamic operation and the like.

The invention discloses a high-voltage submarine cable multi-parameter multi-physics field simulation calculation method, system, device, medium and program, and belongs to the technical field of cable detection. The method comprises the following steps: according to a submarine cable structure, establishing initial finite element models of soil direct burial, a seabed, a cable trench and a transition section; according to the initial finite element model, mesh generation is carried out on the submarine cable cross section, and a finite element simulation model after mesh generation is established; performing multi-physical field coupling calculation through the finite element simulation model after mesh generation to obtain the temperature of the submarine cable, and performing simulation calculation of the submarine cable core according to the temperature of the submarine cable; and comparing the cable core temperature of the submarine cable in the simulation calculation result with the temperature measured in an optical fiber temperature measuring device arranged in the submarine cable to obtain a simulation error and an actual error. According to the method, the distribution conditions of the temperature field, the magnetic field and the fluid velocity field around the cable and the temperature change condition of the laying transition section can be observed simultaneously, and the temperature of the submarine cable during change is obtained.

The invention provides a submarine cable dynamic laying path control method based on towing cable tension and attitude feedback, and the method comprises the steps: carrying out the tension data collection of a towing cable of a submarine cable laying ship through a first tension measurement mode, and generating a first tension measurement result; dynamically optimizing the towing cable tension data in the first tension measurement result based on a second tension measurement mode to obtain a second tension measurement result; and adjusting the path points in the second tension measurement result in combination with attitude feedback and a third tension measurement mode to generate a final submarine cable laying path control result. According to the method, dynamic control over the submarine cable laying path is achieved through multi-stage tension measurement and attitude feedback, and laying precision and stability are improved.

The invention relates to the technical field of submarine optical cable burying, in particular to a submarine optical cable curve burying ship position line planning method and system based on parameterization calculation. The method comprises the following steps: setting a routing point and a steering point, determining the radius of an internally tangent turning circle, and enabling the internally tangent turning circle to be respectively tangent to the point; calculating the horizontal towing distance of the burying plough; respectively extending from the tangent points along the extension direction of the route to obtain the stern position at the beginning of steering and the stern position at the end of steering, and calculating the radius of the ship position circle; and calculating a ship head direction change angle arc length, a ship true course, a ship relative azimuth angle and a ship moving distance when the ship moves in the true azimuth angle each time when the ship moves each time, and finally completing the calculation of the embedded ship position when the ship steers. The technical problems that in the prior art, submarine optical cable steering and burying depend on visual observation and past experience of an operator, so that precision is poor, and the burden of the operator is heavy are effectively solved.

A state estimation apparatus according to the present disclosure includes: at least one memory configured to store a group of commands; and at least one processor configured to execute the group of commands to calculate, for each point on a submarine cable, response characteristics to vibration applied to that point on the basis of a measurement signal obtained by a measurement apparatus by executing optical fiber sensing using an optical fiber included in the submarine cable, compare, for each point on the submarine cable, the response characteristics of that point with the response characteristics of a reference point, and obtain a result of the comparison as a first comparison result, and estimate a state of the submarine cable on the basis of the first comparison result of each point on the submarine cable.