555 results about "Ice melt" patented technology

The invention relates to the technical field of tunnel disaster identification, in particular to a tunnel portal icing disaster identification and prediction method based on a multi-modal data fusion technology. According to the technical scheme, the method comprises the steps of multi-source data acquisition, heterogeneous data processing, feature level fusion, disaster recognition, space-time prediction and dynamic early warning. According to the invention, a multi-modal sensor is deployed to collect tunnel portal temperature, space structure and environmental parameters, intelligent processing and multi-stage feature fusion are carried out, ice layer distribution identification, icing trend detection and time-space prediction are realized by using a deep network, an ice melting device is dynamically activated in combination with a graded early warning mechanism, and vehicle early warning is linked. A sensing, analysis, prediction, disposal and calibration closed loop is formed, the accuracy of ice coagulation disaster detection, the prospective performance of prediction and the intelligence of disposal are remarkably improved, and the tunnel traffic safety and the long-term robustness of the system are guaranteed.

The invention relates to the field of super-hydrophobic materials, in particular to a basalt fiber composite material as well as a preparation method and application thereof. According to the composite fabric material provided by the invention, a multistage micro-nano rough surface of the MoS2 nanoflowers and the silver nanoparticles is constructed on the fiber substrate, so that not only is super-hydrophobic self-cleaning realized, but also the anti-icing performance is relatively high, and particularly, rapid heating is realized by combining broadband absorption of the MoS2 nanoflowers and a local surface plasma resonance effect of the silver nanoparticles; and meanwhile, the silver nanoparticles accelerate heat conduction, so that excellent ice melting capability is obtained. The high conductivity of the silver nanoparticles constructs a conductive path, and the layered structure of MoS2 triggers interface polarization, so that the electromagnetic shielding effectiveness of the X wave band is improved. The dual antibacterial mechanism of the MoS2 nanoflowers and the silver nanoparticles also realizes broad-spectrum efficient antibiosis, the preparation method is green and environment-friendly, the cost is low, and the requirements of complex scenes such as wearable electronic equipment, medical protection, polar region protection and national defense can be met.

The invention relates to the technical field of electric power icing prediction, and discloses an electric power line icing prediction method and system, and the method comprises the steps: obtaining electric power data and meteorological data, and carrying out the data preprocessing; and extracting a first feature of the line icing to obtain a second feature and a third feature of the line icing, constructing a line icing prediction model through a machine learning algorithm, predicting the icing condition of the power line in real time, and outputting a line icing thickness prediction result. According to the method, physical prediction and a machine learning model are fused, multi-dimensional information such as weather, line states and historical data is combined, the icing thickness prediction precision is remarkably improved, real-time monitoring and dynamic early warning can be achieved, minute-level icing thickness updating and risk grading are supported, ice melting or dispatching instructions are triggered in time, and the ice melting efficiency is improved. The method still has relatively high robustness in complex environments such as mountainous areas, high altitudes and extreme weather; the manual inspection frequency can be reduced, and the operation and maintenance cost is reduced.

The invention provides a mountain wind power plant fan icing intelligent forecasting method and system, and relates to the field of fan icing forecasting. The method comprises the following steps: determining a meteorological element threshold value of a fan in an icing scene and a meteorological element threshold value of the fan in an ice melting scene; establishing a temperature-wind speed-power dynamic response model; constructing a three-layer linkage model for fan icing prediction; the first-layer model judges an icing condition in a preset range around the station based on a meteorological element threshold value in an icing scene; the second-layer model is started before the first-layer model judges the icing condition, and a convection radiation ice melting scheme is coupled when the meteorological condition reaches a meteorological element threshold value in an ice melting scene; and on the premise of the second-layer model, the third-layer model timely triggers graded early warning based on a temperature-wind speed-power dynamic response model, and outputs a forecasting and early warning result. According to the method, the regional adaptability and precision of fan icing forecasting are improved, risk level early warning is optimized, and about 10% of power generation loss of a wind power plant is reduced.

The invention relates to the technical field of electrical digital data processing, and discloses a train ice melting simulation optimization method of an electromagnetic thermal coupling model fused with a deep learning method, which comprises the following steps of: inputting a geometric representation tensor and a physical working condition parameter vector containing an electromagnetic excitation frequency and a reference environment temperature into a feature mapping neural network; outputting a dual-channel space source item tensor containing basic heat source power density and a heat source to temperature change sensitivity distribution matrix through nonlinear convolution operation; constructing a heat conduction discrete numerical value evolution operator configured with an active item linear correction interface; time stepping operation is executed according to the heat conduction time scale, a basic heat source is corrected in real time through the Hadamard product of a sensitivity distribution matrix and temperature deviation, and an operator is substituted for solution. On the premise that electromagnetic-thermal nonlinear coupling characteristics are reserved, decoupling of the time scale is achieved, and the calculation efficiency in high-frequency physical field simulation is effectively improved.

According to the technical scheme, the power transmission line comprises a plurality of lines, and the method comprises the following steps: calculating the ice thickness prediction value of each ice melting section based on the real-time ice thickness prediction value of each ice melting section, the bearing capacity of a tower, the tension and crossing distance of a ground wire, and the load of a hardware fitting and an insulator; calculating the real-time icing safety degree of each ice melting section; sequencing all the ice melting sections according to the real-time icing safety degree of each ice melting section to form an ice melting sequence set, and selecting the ice melting section with the highest ice melting urgency degree according to the ice melting sequence set to execute ice melting operation; in the ice melting process, ice melting current is intelligently regulated and controlled according to real-time monitoring data, a fastest ice melting mode or a common ice melting mode is selected according to an external instruction, and three strategies of aggressive, balanced and conservative are further subdivided in different modes; according to the invention, efficient and safe ice melting operation can be realized under complex working conditions, and the operation reliability and the ice melting efficiency of the power transmission line are remarkably improved.

The invention discloses a concrete model under salt freezing circulation, a construction method and a construction method of a damage evolution model, and a salt freezing circulation process is simplified into processes of continuous accumulation of sulfate crystals in pores, water condensation into ice, and repeated expansion and contraction of ice melting into water. The process of continuous accumulation of pore sulfate crystals in the sample concrete model and the process of mortar reduction and porosity increase in the sample concrete model are simulated, model parameters are adjusted, so that the salt freezing process of the sample conforms to the actual situation, and the service life of concrete is predicted through the sample concrete model. A specific time node reaching a failure standard is accurately predicted; the invention discloses a concrete damage evolution model based on the combination of continuous damage mechanics and a crack propagation theory, and aims to solve the problem that a traditional concrete damage model cannot accurately predict concrete damage evolution in a salt freezing circulation environment, and particularly, the long-term influence of the salt freezing environment on a concrete structure is lack of accurate quantitative analysis.

The invention discloses a method and a system for optimizing an intelligent ice melting device of an ultra-high voltage transmission line, which are applied to the field of transmission line maintenance, and comprise the following steps of: analyzing and processing state data of an iced line to obtain time-domain dynamic data reflecting ice layer thickness and wire temperature change, extracting harmonic components from the time-domain dynamic data, and calculating the ice layer thickness and the wire temperature change according to the harmonic components. Obtaining ice layer state frequency domain distribution data according to the harmonic component, and determining an ice layer state change trend according to the ice layer state frequency domain distribution data; constructing a power transmission line harmonic state space model, and reconstructing the optimized power transmission line harmonic state space model to obtain an ice layer impedance dynamic prediction model; in the actual ice melting process, the operation parameters of the ice melting device are dynamically optimized and adjusted according to the ice layer impedance dynamic prediction model. According to the method, the dynamic characteristics of the ice layer state can be accurately extracted, the ice melting efficiency and accuracy are improved, excessive ice melting or insufficient ice melting is avoided, and the operation safety of the power transmission line is enhanced.

The invention discloses a super-hydrophobic road ice-inhibiting coating based on a photothermal effect and nano modified particles and a preparation method of the super-hydrophobic road ice-inhibiting coating. The preparation method comprises the following steps: introducing silane modified nano silicon dioxide (SiO2) and titanium dioxide (TiO2) particles into a polyaniline solution, and preparing the composite super-hydrophobic powder through a chemical oxidation polymerization method. The preparation method comprises the following steps: firstly, modifying the surfaces of SiO2 and TiO2 nanoparticles by adopting a silane coupling agent, and endowing the SiO2 and TiO2 nanoparticles with low surface energy and hydrophobic property; and then adding the modified nano-particles into an aniline monomer solution, reacting with doped acid and an oxidizing agent, so that polyaniline molecules are subjected to in-situ polymerization on the surfaces of the particles, and the composite super-hydrophobic powder with a micro-nano structure is formed. The obtained composite material has excellent photothermal conversion performance and super-hydrophobic performance at the same time, and the efficient photothermal material heat absorption ice melting effect and the synergistic ice restraining effect of the photothermal material and the super-hydrophobic material can be achieved. Compared with a traditional ice-inhibiting coating, the coating disclosed by the invention shows stronger ice-resisting capability in a low-temperature and high-humidity environment, has good durability, mechanical stability and environmental protection property, and is suitable for the field of ice prevention and ice inhibition in cold regions such as roads, bridges, airport runways and the like.

The invention, which belongs to the technical field of power transmission line deicing, discloses an ice and snow disaster-resistant power transmission line adaptive ice melting device comprising an annular body of which the inner diameter is adaptive to the outer diameter of a power transmission line and which is used for being fixed on the power transmission line in a surrounding manner; the distributed temperature sensor array is uniformly embedded in the inner surface of the annular body and is used for monitoring the surface temperature distribution of the power transmission line in real time; the heating element layer covers the periphery of the annular body, comprises at least two conductive film layers which are insulated from each other, and is used for generating Joule heat in gradient distribution; and the control module is arranged in the waterproof cavity at the side part of the annular body, is electrically connected with the temperature sensor array and the heating element layer, and is used for dynamically adjusting heating parameters according to the temperature data. When temperature values of more than three adjacent sensors are detected to be lower than a freezing point threshold value, a gradient heating program is started, the current density of each conductive film layer is dynamically adjusted according to an icing thickness calculation model, and melting and falling of an ice layer are realized.

The invention relates to a low-voltage distribution network non-power-off online ice melting method based on mobile power supply equipment, and the method comprises the following steps: obtaining meteorological information, and line parameter information and line icing information of a low-voltage distribution network; according to the meteorological information, the line parameter information and the line icing information, calculating the minimum ice melting current required by the icing line and the ice melting line power under the minimum ice melting current; and selecting to deploy a first mobile power supply device for transmitting power, or deploying a second mobile power supply device and the first mobile power supply device for transmitting power and absorbing power respectively, so as to carry out ice melting operation based on the ice melting line power. Ice melting can be carried out without power outage, and the supporting capacity of a distribution network line for coping with extremely cold climate is improved.

The invention discloses a distribution network low-voltage extension type direct-current ice melting method and an ice melting management system, and relates to the field of disaster prevention and reduction of an electric power system, and the method comprises the steps: obtaining an electrical characteristic signal, an icing thickness value and weather forecast data of each target line; calculating power loss distribution of each target line, and dividing the target line into a plurality of electron supply zones; inputting the icing thickness value and the weather forecast data into an icing prediction model to obtain an icing development trend; carrying out correlation operation on the icing development trend and the corresponding power loss distribution to obtain an ice melting priority and an ice melting current value; generating a power supply execution sequence and a direct-current power supply output parameter; and generating an ice melting execution scheme based on the power supply execution sequence and the DC power supply output parameters, and implementing ice melting power supply according to the ice melting execution scheme and the power supply execution sequence. According to the invention, ice melting planning can be carried out, and electric energy waste is avoided.

The invention relates to the technical field of power electronics, in particular to a DC deicing current oscillation suppression method and system, and the method comprises the steps: obtaining an equivalent inductance value and an equivalent capacitance value according to the operation environment data of a DC deicing system; according to the equivalent inductance value and the equivalent capacitance value, when the current state of the direct current deicing system does not meet the current oscillation suppression condition, generating a valve group control optimization strategy based on the equivalent inductance value and the operation environment data; extracting current oscillation characteristic data according to the current waveform data and determining the ice melting efficiency according to the current oscillation characteristic data in the process of controlling the direct current ice melting system to execute ice melting operation through the valve group control optimization strategy; and when the ice melting efficiency does not reach the standard, optimizing the valve group control optimization strategy by using the current oscillation characteristic data and a multi-objective optimization algorithm, and outputting an optimal ice melting control strategy. By dynamically optimizing the valve group control strategy, the ice melting efficiency is considered while the current oscillation is suppressed, and the stable operation of the direct current ice melting system is ensured.

The invention relates to the technical field of road ice melting, and discloses a road ice melting implementation system and method. The system comprises a meteorological monitoring platform, a snow-melting agent spraying platform and a management and control platform, the method comprises the following steps: firstly, collecting meteorological data and monitoring a road surface state to obtain an initial road ice melting data set, and then carrying out anomaly detection and filling missing data; establishing a road ice melting prediction model based on the neural network, predicting whether the road is iced or not, and outputting a road icing result; then ice melting work is carried out, an enhanced hawk optimization algorithm is introduced to optimize spraying parameters in the ice melting work, and a road ice melting implementation strategy is generated; and finally, adjusting a road ice melting implementation strategy, and establishing a snow melting environment coupling model and an alarm mechanism. By analyzing and processing the road ice melting data, the purpose of implementing road ice melting is achieved, and the method is objective and accurate.

The control device comprises a control module, an ice melting power supply module, a boundary switch, a short circuit switch and an ice melting switch, the boundary switch, the short circuit switch, the ice melting switch and a protection switch are arranged on a high-voltage cable, and the control module sequentially drives the boundary switch, the short circuit switch, the ice melting switch and the protection switch to execute state switching through action instructions. The conduction control of the ice melting loop is realized; the control module integrates a finite element algorithm function, collects current, voltage and temperature distribution parameters in an ice melting loop in real time, and dynamically corrects ice melting current parameters through three-dimensional electromagnetic-thermal coupling field simulation; setting a parametric modeling unit, and calculating an optimal voltage regulation gear based on a heat balance equation and a Joule heat effect to realize adaptive voltage regulation; the demarcation switch, the short circuit switch and the ice melting switch are arranged, the effect of cable short circuit heating ice melting is achieved by sequentially controlling the on-off states of all the switches, finite element real-time simulation and parameterization voltage regulation decision are combined, and the cable ice melting efficiency, reliability and safety are remarkably improved.

The invention relates to the technical field of electric power ice melting, in particular to an electric power ice melting intelligent control method and system.The method comprises the steps that when it is detected that the current external environment meets the grounding knife switch opening condition according to meteorological parameters of a target line of an electric power ice melting system, a grounding opening instruction is generated; based on the grounding opening instruction and the line equipment state parameters, determining an optimal opening time point of the phase selection disconnecting link; an opening time sequence rule is generated according to the optimal opening time point, and a phase selection disconnecting link is controlled to execute opening operation according to the opening time sequence rule; determining a priority coefficient of the short circuit closing instruction; in the process of controlling the short-circuit disconnecting link to execute the closing operation according to the priority coefficient, if the ground wire and the wire are successfully connected in series, verifying the actual ice melting operation sequence to obtain an ice melting operation verification result; and based on the verification result of the ice melting operation, generating an ice melting operation optimization sequence by using a decision tree pruning algorithm. According to the invention, intelligent and accurate control of the electric power ice melting process is realized, and the influence of current oscillation on the system is effectively reduced.

The invention discloses a preparation method of a composite micro-groove super-hydrophobic low-ice-adhesion photo-thermal film. The preparation method comprises the following steps: (1) constructing a low-elasticity-modulus photo-thermal composite sponge substrate through a solvothermal method; (2) uniformly coating the surface of a substrate with a polydimethylsiloxane (PDMS) precursor solution by adopting an aerosol-assisted deposition technology, and carrying out thermocuring to form a functional composite interface layer; and (3) constructing a multi-stage scallop surface-imitating micro-nano groove composite structure on the surface of the interface layer by using a femtosecond laser micro-nano processing technology. The prepared film has super-hydrophobicity, the surface of the film is in a Cassie-Baxter wetting state with a 164-degree contact angle and a 1-degree rolling angle, and the film has a surface self-cleaning function. Under the icing condition, the adhesion strength of an ice layer of the system is obviously reduced to 2.57 kPa, the static delay icing time is effectively prolonged to 1587 s, and the system has the photo-thermal response characteristic and can realize rapid icing ablation under the standard solar irradiance; the preparation method has the characteristics of high process controllability, environment friendliness and the like, and is suitable for large-scale continuous production.

The invention relates to the field of super-cooled water ice making, in particular to a super-cooled water ice making system capable of rapidly melting ice and an operation method of the super-cooled water ice making system. The ice making system comprises a supercooled water heat exchanger, a compressor, a condenser and a throttling device. The supercooled water heat exchanger internally comprises a coaxial spiral three-medium heat exchanger which comprises a first fluid channel and a second fluid channel. The first fluid channel is a tubular channel; the second fluid channel is a spiral channel wound on the first fluid channel and is thermally coupled with the first fluid channel; the supercooled water heat exchanger, the compressor, the condenser and the throttling device are communicated through a first refrigerant loop. When supercooled water is prepared, the first fluid channel exchanges heat with a refrigerant in a shell pass of the supercooled water heat exchanger to prepare low-temperature supercooled water; in the ice melting state, exhaust of the compressor of the unit enters the second fluid channel and exchanges heat with the first fluid channel to achieve ice melting. The supercooled water ice-making system provided by the invention can realize quick ice melting, and ensures stable, efficient and continuous preparation of supercooled water.

The invention belongs to the technical field of intelligent operation and maintenance of wind power generation equipment, and particularly relates to a wind turbine blade predictive anti-icing system and method based on digital twinning, and the system comprises a digital twinning prediction module which comprises a three-dimensional model construction unit and an AI prediction algorithm unit. The three-dimensional model construction unit is used for constructing a three-dimensional digital twinborn model of the wind turbine blade; the AI prediction algorithm unit is used for performing icing risk prediction based on the three-dimensional digital twinborn model and meteorological data; the photo-thermal collaborative anti-icing execution module comprises a blade posture adjusting unit and a transparent electric heating glass layer unit, and the transparent electric heating glass layer unit is laid on the surface of the wind turbine blade; according to the invention, a high-risk area is accurately identified through a digital twinborn model, blade yaw and a transparent electric heating glass layer are linked to realize photo-thermal synergistic anti-icing, formation of an ice layer is inhibited from the source, and the passive ice melting demand is reduced.

The invention discloses a subway flywheel energy storage system with a direct-current ice melting function, which comprises a medium-voltage looped network, a contact network, a running rail, a positive bus, a negative bus, a subway rectifier module and a flywheel energy storage module, the subway rectification module is connected with the positive and negative buses. The positive bus is connected with a contact network, and the negative bus is connected with a walking rail; the flywheel energy storage module is connected with the positive bus, the negative bus and the walking rail. The flywheel energy storage module is further connected with the contact net through a circuit breaker QF, and the contact net is connected with the walking rail through a far-end short-circuit switch K3. The invention further discloses an ice melting and energy storage method applying the subway flywheel energy storage system with the direct-current ice melting function. The device has two functions of direct-current ice melting and flywheel energy storage charging and discharging, time division multiplexing is controlled by the two functions through a switch, efficient utilization of equipment is achieved, and the cost performance is improved.

The invention discloses a low-temperature cold trap water removal device which comprises more than two water removal channels which are connected in parallel; each water removal channel comprises a refrigeration water removal gas path and an ice melting purging gas path which are connected in series; each refrigeration and water removal gas path is also connected with an inlet of a dry gas collection gas path, and an outlet of the dry gas collection gas path is used for being connected with an analyzer; and each water removal channel is connected with a controller, and the controller is used for controlling the refrigeration water removal gas paths and the ice melting purging gas paths of the different water removal channels to operate in a staggered mode. According to the application, moisture in the gas to be dewatered can be effectively removed, frost can be timely removed, and related phenomena such as relatively large dead volume of the cold trap can be avoided.

The invention provides a multi-line collaborative direct-current ice melting method, system and device, and relates to the technical field of power transmission and distribution of power systems, and the method comprises the steps: obtaining real-time environment data and line icing thickness data corresponding to an ice melting line based on a line sensor network; constructing an ice melting index calculation model, calculating a line ice melting index and judging a real-time icing state; obtaining the moving distance and cost of ice melting equipment corresponding to the ice melting line, and calculating a comprehensive evaluation index and determining a line ice melting sequence in combination with the line ice melting index; constructing an energy consumption distribution optimization function, obtaining real-time electrical parameters of the ice-melting lines, and determining line ice-melting energy consumption of each ice-melting line in combination with the line icing thickness data; based on the line ice-melting sequence and the line ice-melting energy consumption of each ice-melting line, a multi-line collaborative ice-melting strategy is determined, so that the overall ice-melting efficiency can be improved, the total ice-melting time and energy consumption are reduced, and the energy utilization efficiency is improved.

The invention relates to the technical field of induction type magnetic thermoacoustic, and discloses an ice melting and deicing method and system based on induction type magnetic thermoacoustic. The method comprises the following steps: acquiring ice surface state signal data in real time, and constructing a multi-dimensional signal processing system to output a standardized ice melting signal; establishing a parameter database based on a magneto-thermo-acoustic conversion technology, and positioning target parameters by using a feature matching algorithm to generate a control label; a historical ice melting case information base is constructed, a multi-factor weight distribution model is combined, weighting is carried out through a decision tree algorithm, ice melting matching degree scores are calculated, and a priority sequence is generated; solving an optimal ice melting scheme by adopting an improved genetic algorithm; and outputting a result through the interactive verification platform, and tracking and feeding back. According to the method, the ice melting process can be accurately regulated and controlled, multiple factors are comprehensively considered, the ice melting efficiency is effectively improved, the energy consumption is reduced, intelligent and accurate ice melting is achieved, and the method is suitable for ice melting and deicing work in multiple scenes.

The invention relates to the technical field of information, and discloses a modularization-based combined mobile ice melting control method and system, and the method comprises the steps: building an accurate ice melting demand model through analyzing the ice melting demand parameters of various power transmission lines in a power grid; quantizing the voltage and current output data of the power transmission line by adopting a multi-objective optimization algorithm to generate a preliminary equipment combination scheme; updating the equipment combination by evaluating the performance attenuation trend of the initial equipment combination in various scenes to obtain a final equipment combination scheme; a modular design method is utilized to construct a combined mobile ice melting system suitable for various scenes according to final equipment combination, a fuzzy control algorithm is adopted to generate a preliminary control strategy, a self-adaptive learning mechanism is introduced to update control parameters, and a multi-level system performance simulation platform is constructed to further optimize the system. According to the scheme, the combined mobile ice melting system can adapt to various application scenes, and the ice melting efficiency of the power transmission line is effectively improved.

The invention discloses a 330KV power transmission line deicing device, and relates to the technical field of power transmission line maintenance, the 330KV power transmission line deicing device comprises a device base and a deicing planning system, an adjusting mechanism is fixedly arranged on the surface of the bottom end of the device base, and a deicing mechanism is fixedly arranged on the surface of the bottom end of the adjusting mechanism; the deicing planning system comprises an image acquisition unit, an image processing unit, a deicing mode planning unit, a master control system and an icing prediction unit. The deicing modes can be controlled to be switched according to the deicing planning mode, and the deicing modes comprise the first-stage deicing state, the second-stage deicing state and the third-stage deicing state. Wherein the first-stage deicing state refers to heating deicing, the second-stage deicing state refers to heating deicing and crushing deicing, and the third-stage deicing state refers to heating deicing, crushing deicing and swinging deicing which are performed synchronously, so that the deicing requirement can be met, energy can be saved, the service time of equipment is prolonged, and the working efficiency is improved. And meanwhile, vibration generated on the power transmission line in the deicing process can be reduced.

The invention discloses a mobile contact network direct-current ice melting method, which comprises the following steps that: a monitoring vehicle and an ice melting vehicle are marshaled and run to a designated place, the two vehicles are de-marshaled, the ice melting vehicle is parked to the designated place, and the monitoring vehicle continues to run towards an ice melting section. The ice melting vehicle starts to electrically connect the wire clamp for construction after the contact network is subjected to electricity testing and grounding, and at the moment, the monitoring vehicle collects environment working conditions and icing state information in the ice melting section. And after construction of the electric connecting wire clamp and acquisition of monitoring information are completed, the monitoring vehicle sends an optimal ice melting current value to the ice melting vehicle, and the ice melting vehicle outputs an actual ice melting current after judging that the ice melting vehicle works normally. In the ice melting process, the monitoring vehicle reciprocates in the ice melting section, the icing degree of the contact network is monitored, and when it is monitored that icing disappears, an ice melting stopping instruction is sent to the ice melting vehicle. After ice melting is finished, the contact network is subjected to electricity testing and grounding at the ice melting vehicle, then the electric connecting wire clamp is removed, and the monitoring vehicle runs towards the ice melting vehicle. The technical problems that an existing overhead line system electric heating ice melting device is poor in mobility and low in utilization rate can be solved.

The invention belongs to the technical field of tunnel terrestrial heat utilization in alpine regions, and particularly discloses a terrestrial heat three-dimensional heat preservation and ice melting system suitable for a cable fire ditch and a drainage ditch of an alpine deeply-buried highway tunnel. The terrestrial heat three-dimensional heat preservation and ice melting system comprises a terrestrial heat taking subsystem, a terrestrial heat pipe heat preservation result, a heat exchange unit and a heat supply subsystem. The terrestrial heat taking subsystem is connected with the heat exchange unit through a transmission pipeline, the heat supply subsystem is connected with the heat exchange unit through the terrestrial heat pipe heat preservation subsystem, and the terrestrial heat taking subsystem is located in a terrestrial heat source area which is about two kilometers away from a tunnel entrance. The system transmits heat to the cable trench and the drainage ditch through circulating high-temperature fluid, so that the temperature of the regions is always kept above a freezing point, and water in the cable, the fire-fighting pipeline and the drainage ditch is prevented from being frozen. The system has the advantages of being efficient, energy-saving, clean, environment-friendly, convenient to construct and the like, and meets the anti-freezing requirements of tunnel cables, fire-fighting pipelines and drainage ditches in the high and cold environment.

The invention relates to the technical field of direct-current deicing device tests, and provides a dynamic load test method and system for a direct-current deicing device. Comprising the following steps: generating a load sudden change sequence comprising ice layer falling positions, ice layer falling thicknesses and load impedance fluctuation time sequence data corresponding to a plurality of load sudden change time periods according to operation state data of a direct current ice melting device in an ice layer non-uniform melting scene; according to a preset dynamic load response mechanism comprising an adaptive adjustment power protection trigger threshold value and a control system time delay threshold value, bus voltage response simulation is carried out on each load abrupt change time period in the load abrupt change sequence in sequence to obtain a direct current bus response time sequence data set; and carrying out anti-disturbance capability analysis on the direct-current ice melting device by combining a preset anti-disturbance capability evaluation threshold value to obtain an anti-disturbance capability evaluation result. Based on dynamic simulation of load mutation caused by uneven melting of an ice layer and influence of the load mutation on bus voltage response, comprehensiveness and reliability of disturbance rejection evaluation of the direct-current ice melting device are improved.

The invention discloses an optimization method for preventing freezing in cold start of a fuel cell, and relates to the technical field of fuel cells, the optimization method comprises the following steps: S1, collecting environment temperature and stack internal freezing condition data, and analyzing water production rate and temperature rise ice melting capability; s2, constructing a prediction model capable of reflecting the relationship among the environment temperature, the internal icing condition of the electric pile and the ideal current density; s3, inputting the environment temperature and the internal icing condition of the electric pile into the prediction model, and adjusting the parameters of the fuel cell; the air temperature is indirectly controlled through a current density curve predicted by a model, stack water production-ice melting balance is converted into a flow distribution optimization problem, and voltage fluctuation feed-forward compensation is combined, so that cooperative control of the temperature and the electrochemical state is realized, the performance of the fuel cell in the cold start process is optimized, and the performance of the fuel cell in the cold start process is improved. And the stability and the output efficiency of the system are enhanced, and powerful technical support is provided for application of the fuel cell in a low-temperature environment.

The invention relates to the technical field of ice prevention and disaster reduction of high-voltage power transmission lines, and discloses a cascaded direct-current ice melting system of a high-voltage power transmission line, a control method and a device. The method comprises the following steps: inputting a test signal to the cascaded direct-current deicing system, and detecting the voltage and current of each node; calculating line impedance distribution based on the voltage and current of each node, and constructing a line equivalent model; calculating the minimum ice melting current based on the ice thickness monitoring data and the weather data, and calculating the output current of each ice melting device based on the minimum ice melting current and the line equivalent model; monitoring circulating current between systems, and calculating virtual compensation voltage based on the circulating current; and adjusting the output voltage of each ice melting device based on the virtual compensation voltage. The ice melting success rate, the safety of the system and the service life of the system can be improved.