31results about How to "Reliable principle" patented technology

The invention discloses a generator stator winding broadband off-line partial discharge test method and device, and relates to the technical field of generator partial discharge off-line tests.The generator stator winding broadband off-line partial discharge test method comprises the steps that a sampling interval is set according to a variable step size strategy and a variable period delay strategy, and an acquisition system is initialized; synchronously monitoring phase information of externally applied voltage-withstanding power frequency alternating current, starting timing, and timing according to a single-period sampling interval mechanism and a full-period sampling interval mechanism; acquiring partial discharge signals and performing synchronous extrusion wavelet transform by using a mother wavelet function to obtain signals of different frequency components; and restoring the extracted frequency band signal to a time domain, and drawing and outputting a partial discharge time domain and phase domain result graph. The generator stator winding broadband off-line partial discharge test method provided by the invention reflects the discharge condition of the high frequency band after the stator insulation system is aged. For the facts that a high-frequency signal channel is narrow and attenuation is fast, the device is suitable for on-site measurement of partial discharge of a large-scale synchronous generator set stator insulation system of 27kV and below.

The invention discloses a protection device hardware-in-the-loop test method and system, and relates to the technical field of in-the-loop tests, and the method comprises the steps: constructing a simulation scene in a hardware-in-the-loop simulation test system; according to the installation position of the to-be-verified protection device in the simulation scene, minimum sampling signals needed by normal work of the to-be-verified protection device are determined, and a current transformer model capable of restoring a transient saturation scene is established; electrifying the to-be-verified protection device, and enabling the hardware-in-the-loop simulation test system to output an electrical signal; when a correct sampling reading is obtained on the protection device, a fault scene is simulated in a simulation scene, and whether an action result meets a constant value and action logic or not is determined through logic judgment of a current signal which is calculated by a model and contains transient saturation characteristics and the protection device. According to the protection device hardware-in-the-loop test method provided by the invention, the truth value current in a non-ideal fault state is restored, and the working characteristics of the relay protection device of the power station are deeply tested.

The invention discloses a method for preparing formate through carbonate electroreduction and application of the formate. The method comprises the following steps: 1) assembling a three-electrode system by using an electrode loaded with a tin-based oxygen-containing compound as a working electrode, an Ag / AgCl electrode or Hg / HgO electrode as a reference electrode, a platinum electrode as a counter electrode and a carbonate solution as an electrolyte, and filling the electrolyte into a gas diffusion electrochemical reaction tank; and 2) introducing oxygen-containing gas into the gas diffusion electrochemical reaction tank, electrifying to sequentially carry out local reduction of the tin-based oxygen-containing compound, electroreduction of carbonate and regeneration of the tin-based oxygen-containing compound, and circulating in sequence. The method for preparing formate through carbonate electroreduction has the advantages of being easy to operate, simple in equipment, reliable in principle, low in cost, high in stability and the like, and is suitable for large-scale industrial application.

The invention discloses a preparation method and application of gel bio-ink for 3D printing of a small-diameter artificial blood vessel. The preparation method comprises the following steps: providing methylacryloylated recombinant collagen; providing methacrylated hyaluronic acid; the gel bio-ink for preparing the 3D printing small-diameter artificial blood vessel is obtained by taking methylacryloylated recombinant collagen and methylacryloylated hyaluronic acid as raw materials. The gel bio-ink has a strong photocuring characteristic and has a shear thinning characteristic required by bio-printing, an artificial blood vessel stent with the diameter of 6 mm and the height of 1 cm can be successfully prepared through a photocuring 3D printing technology, and the artificial blood vessel stent meets the size requirement of small-diameter blood vessels. An intravascular stent printed by using the gel bio-ink has the advantages of good blood compatibility, effective promotion of rapid endothelialization of the stent, prevention of vascular restenosis and the like, is a potential candidate of a small-caliber blood vessel substitute in the future, and has a wide application prospect in the artificial blood vessel market.

This invention relates to oil and gas field development technology and discloses a quantitative comprehensive evaluation method for the oil stabilization and water control effect of horizontal wells. The method includes: determining whether the target water control well is a producing old well or a new well; collecting relevant operating parameters of adjacent wells at the same oil column height and formation level before and after the application of the water control technology, based on whether it is a producing old well or a new well; collecting relevant parameters required for evaluating the economic benefits of water control in a single well; evaluating the impact of the water control technology on oil and water production by comparing the water production index and water cut, using indicators such as the effective period of water control, increased oil production, and changes in water production, and evaluating the water control effect; conducting a single-well water control economic evaluation based on the water control effect; and comprehensively evaluating the water control effect and economy of the horizontal well. Using the method provided by this invention, a quantitative comprehensive evaluation of the water control effect is conducted from the perspectives of increasing oil production, stabilizing oil production, controlling water, and economics, effectively evaluating the oil stabilization and water control effect and economy of horizontal wells, and effectively guiding the design of water control schemes and process selection.

The invention belongs to the technical field of artificial intelligence and network predictive maintenance, relates to a fault prediction method based on a multi-source migration echo state network, and aims to solve the problem of low prediction precision caused by insufficient early samples of a fault, and the method comprises the following steps: firstly, extracting migration knowledge from a plurality of historical fault source domains by using the echo state network; secondly, measuring the similarity between the source domains and the target domain and the difference between the source domains by adopting a dynamic time warping distance, and selecting a plurality of similar source domains with complementary information; then, a plurality of prediction sub-models are established in the target domain in combination with migration knowledge of the selected source domain, and a final prediction model is obtained through integrated learning; and finally, performing future value prediction on the key variables acquired in real time by using the model. According to the method, multi-source historical information can be fully utilized under the small sample condition, the fault prediction precision and generalization ability are remarkably improved, and the method is suitable for fault prediction scenes with multi-source time series data in industrial processes, mechanical equipment, power systems and the like.

The invention relates to a large-expansion-rate all-metal ultra-small-diameter bridge plug which mainly comprises an integral expansion cone, a hoop ring A, a sectioning expansion cone A, slip teeth, a metal spiral slip, a sectioning expansion cone B, a hoop ring B, a pin, a lower joint and a center rod, and is characterized in that the integral expansion cone, the sectioning expansion cone A and the sectioning expansion cone B are pushed by a setting tool to annularly move towards the inner part of the metal spiral slip; due to the limiting effect of the shroud ring, the integral expansion cone and the split expansion cone A cannot generate relative motion, along with continuous increase of thrust, the shroud ring A and the shroud ring B are fractured, the split expansion cone A and the split expansion cone B generate radial displacement, the metal spiral slip continuously expands until slip teeth penetrate into the inner wall of a casing pipe, and setting operation is completed. By adopting an all-metal structure and different expansion cone combinations, the problems of low expansion rate, large outer diameter and the like of a traditional bridge plug can be solved, and the bridge plug has the advantages of large expansion rate, ultra-small outer diameter, high temperature resistance and the like, can be normally used in a deep casing deformation well, and is beneficial to benefit development of unconventional oil gas.

The invention provides an oil-immersed transformer fault decision-making method and system based on a three-dimensional voiceprint map, and the method comprises the steps: collecting a voiceprint signal of a transformer body through a high-sampling-rate microphone array which is arranged in a standardized manner; an optimized decoding process based on improved inverse discrete cosine transform is innovatively adopted to construct a three-dimensional voiceprint map matrix containing time, frequency and sound intensity information, and the limitation of traditional single feature analysis is broken through; space-time alignment and fusion are carried out on the voiceprint map, the real-time load rate, the oil temperature and other multi-physical field data, a unified high-dimensional feature vector is constructed, and efficient processing and feature mining are carried out on the high-dimensional data through a light-weight sliding window feature extraction mechanism of depth separable convolution reconstruction. More sensitive and robust online diagnosis of early abnormal states and composite faults is realized, and model complexity and calculation burden are remarkably reduced through deep adaptation of a core algorithm and a hardware architecture.

The application discloses a track state monitoring system and method based on concave mirror laser reflection displacement amplification, and the system comprises a track state monitoring device and an optical concave mirror, which are composed of a laser transmitter, a laser target, an industrial camera, an NB-IoT module, a microprocessor and a power module. The laser transmitter and the laser target are arranged opposite to the optical concave mirror, and the central axis of the laser transmitter and the central axis of the mirror surface of the optical concave mirror are horizontally arranged on the same vertical plane. The industrial camera is used for capturing laser spot information reflected on the laser target through the optical concave mirror. The microprocessor realizes track state monitoring by machine vision processing and analyzing the laser spot information acquired by the industrial camera. The NB-IoT module uploads the monitored track state to a central server. The effect is that the settlement, inclination and horizontal offset of the track can be effectively and accurately monitored in real time.

This invention provides a method for optimizing mechanical water control technology in oil wells, relating to the field of oil and gas field development and exploitation technology. The method includes the following steps: S1: Screening wells for stable oil production and water control based on comprehensive geological reservoir data, well trajectories, and water control well selection requirements; S2: Collecting reservoir data and drilling / completion data for the target water control wells; S3: Evaluating the effectiveness of existing water control in production wells within the target block to determine the adaptability of the stable oil production and water control technology; S4: Optimizing the stable oil production and water control technology based on the adaptability of the block's stable oil production and water control technology and the water-bearing pattern along the horizontal section; S5: Selecting a compartmentalization method and arranging water control valves according to the selected stable oil production and water control technology; S6: Establishing a coupled numerical model of the wellbore and reservoir using numerical simulation software to simulate and predict changes in oil production and water cut due to water control; S7: Selecting an intelligent control method based on reservoir temperature; S8: Selecting a water production monitoring method based on the water production monitoring requirements along the flow path; S9: Evaluating the economic benefits of water control using an input-output ratio model.

This invention discloses a device and method for evaluating the self-healing performance of CCUS well cementing. In this device, a liquid injection unit and a gas injection unit are respectively connected to the cavity of a reaction vessel. A data acquisition unit is connected to the reaction vessel and collects relevant parameters within the reaction vessel's cavity. The data acquisition unit is connected to a data processing unit. A control unit is connected to both the data processing unit and the data acquisition unit. Self-healing cement samples and ordinary cement samples undergo pre-damage treatment. Then, breakthrough pressure tests are performed on the self-healing pre-damaged samples and the ordinary pre-damaged samples, respectively, to obtain the breakthrough pressure of the self-healing sample and the breakthrough pressure of the ordinary sample. If the breakthrough pressure of the self-healing sample is greater than that of the ordinary sample, the self-healing cement sample is judged to have the ability to self-heal microcracks. This invention is reliable in principle, convenient to operate, has a reasonable structure, and the testing process is simple and quick.

The utility model belongs to the field of mining equipment, and relates to a mining explosion-proof change-over switch, which mainly comprises a branching explosion-proof cavity, a switch explosion-proof cavity and a main line explosion-proof cavity which are connected from top to bottom, and also comprises a wiring device and a fixing device, the explosion-proof cavity is electrically connected with the other two explosion-proof cavities through the first switching device and the second switching device. According to the utility model, a three-cavity separated explosion-proof structure is utilized, the combined switch which easily generates electric sparks during operation is independently isolated in the switch explosion-proof cavity, the safety is improved, circuit wiring and control are carried out on electrical equipment in explosive environments such as a mine through the three-stage combined switch, and when the electrical equipment fails, power supply does not need to be cut off in a power distribution room, so that the cost is reduced. Under the condition that the main line is not influenced, the switch knob can be used for controlling the circuit to cut off the branch line so as to facilitate maintenance; the explosion-proof junction box has the function of connecting the main line and the branch line in parallel, and can replace a common explosion-proof junction box.

The present invention discloses a liquid level detection fixture for proton exchange, comprising a substrate slot block, a clamping rod, a light guide rod and a transceiver module, wherein the lower part of the clamping rod is provided with a substrate slot block, the light guide rod is arranged inside the clamping rod, and the top of the light guide rod is provided with a transceiver module; the bottom end of the clamping rod is provided with a base, a bottom support plate is provided below the base, and a through hole B for permeating proton exchange liquid is provided on the bottom support plate. The present invention is simple and reliable, novel in structure, and low in cost, and is worthy of further promotion and use.

This utility model relates to an electroslag furnace feeding module, including an electroslag furnace. The feed inlet of the electroslag furnace is located at the top center. A hopper is fixedly installed at the feed inlet of the electroslag furnace. The hopper is equipped with water-cooling pipes inside. The top diameter of the hopper is larger than the bottom diameter of the hopper. The bottom of the hopper is coaxial with the feed inlet. A cover plate is detachably installed on the inner top of the hopper. A through-hole is provided at the top center of the cover plate. The through-hole is fitted with the feed bar with a clearance. The periphery of the cover plate is attached to the inner wall of the hopper. An insulating heat strip is bonded and fixed to the periphery of the cover plate. The insulating heat strip is composed of stacked porous silicon heat insulation films. A mounting hole with internal and external communication is provided at the bottom of the hopper. A nozzle is fixedly installed in the mounting hole. One end of the nozzle located on the outside of the hopper is connected to a flexible hose. The hose is covered with a high-temperature resistant insulating layer. The hose and nozzle work together to input argon gas into the inner bottom of the hopper and prevent air from entering.

The utility model provides a stamping air cushion type load platform, which belongs to the technical field of air cushion load, and comprises two load buoys and a load cabin positioned above the load buoys, a diffusion air cabin is formed between the load buoys and the load cabin, and the diffusion air cabin comprises a front cabin plate and a rear cabin plate which are positioned between the two load buoys and are tightly connected with the load buoys; an opening is formed between the top of the front cabin plate and the bottom plate of the load cabin and is a stamping air inlet; when the air cushion platform sails in the speed V direction, after air with the relative speed enters the diffusion air cabin from the stamping air inlet, the speed is reduced to zero, the kinetic energy of the air is completely converted into pressure energy, the pressure of the diffusion air is increased, and the air cushion platform can be supported out of the water surface when the pressure of the diffusion air cabin is increased to a certain level along with the increase of the sailing speed. The structure is simple, the principle is reliable, and the construction economy is good.

This invention discloses a nuclear magnetic resonance (NMR) method for measuring the solid phase deposition of crude oil in porous media, belonging to the field of oil and gas reservoir development technology. By using a single saturation of crude oil in a core sample and leveraging the characteristics of online NMR technology, the method employs a comparison of experimental and NMR measurements, along with a 1:1 standard line reference, to determine the standard echo interval T in the transverse relaxation time T2 measurement acquisition parameters. E This method directly measures the amount of solid phase deposition in pore fluids in situ, solving the technical problems of existing technologies that cannot maintain the original characteristics of the sample, effectively avoid the interference of solid skeleton response and solid phase deposition particles, and are difficult to measure the solid phase deposition content of active oil in situ. It achieves the technical effect of rapid, efficient and accurate measurement of the amount of crude oil solid phase precipitation in cores under specific temperature and pressure conditions. The method is reliable in principle, simple to operate and highly applicable, and the test results are accurate and reliable, making it more suitable for the fine characterization needs of complex oil and gas reservoirs.

This invention relates to the field of oil and gas field fracturing technology, and particularly to an integrated device and method for horizontal well cluster-level fluid extraction, production measurement, and fracturing. The technical solution is as follows: a multi-nozzle pressure-controlled switch jet pump and a first packer are connected to the casing downhole via tubing. Within the horizontal section, a production measurement and fracturing control valve and a water hammer wave monitor are connected via tubing. The production measurement and fracturing control valve and the water hammer wave monitor are located between the second and third packers. The advantages are: by coordinating the multi-nozzle pressure-controlled switch jet pump with the production measurement pump core of the storage-type downhole jet pump, fluid extraction and formation production data can be measured in cluster-level sections of the horizontal well. Furthermore, by moving the positions of the production measurement and fracturing control valve and the water hammer wave monitor, fracturing operations can be performed on the corresponding cluster sections requiring modification. Simultaneously, water hammer wave data can be measured at close range. A single drilling run completes the functions of fluid extraction, production measurement, and fracturing, resulting in low construction costs and high measurement accuracy.

The invention discloses a solid mud acid system and a preparation method thereof. The solid mud acid system comprises solid hydrogen release acid, solid fluorine release acid and a solid acidification additive; the total mass of the solid hydrogen release acid and the solid fluorine release acid accounts for more than 60% of the total mass of the solid mud acid system, and the balance is the solid acidification additive. The solid mud acid system is solid powder particles which are stable under normal temperature and normal pressure conditions, when the solid mud acid system is used on site, 20-30% by mass of solid mud acid powder is directly diluted with fresh water and stirred for 10 min, and a solid mud acid solution can be obtained and used for plugging removal of an oil-water well in an oil field. The acidizing agent is used for acidizing construction of the offshore operation time and space limited platform, can replace an existing land solid acid system, has the advantages of being high in effective ingredient content, small in dosage, convenient to store and transport, easy to construct and the like, and can effectively solve the problem that conventional acidizing of the offshore operation time and space limited platform cannot be normally carried out.

The present invention relates to a float type two-way stop valve control system, comprising a drainage pipe, a vacuum valve installed on the drainage pipe and a two-way stop float for controlling the opening and closing of the vacuum valve; a two-way stop valve is arranged inside the two-way stop float, the two-way stop valve has an atmospheric air inlet connected to the atmosphere, a negative pressure air inlet connected to the drainage pipe and a vacuum valve connecting port connected to the vacuum valve, and a gravity steel ball is arranged inside for separately sealing the atmospheric air inlet and the negative pressure air inlet; the opening and closing of the vacuum valve in the present invention is controlled by the two-way stop valve, a pure mechanical structure is adopted, defects such as power supply voltage drop will not be generated, the overall structure is simple, the principle is reliable, and there is no operating cost; at the same time, the two-way stop valve is the core component of the present invention, which is installed inside the sealed two-way stop float and is not affected by the climate and the use environment, thereby ensuring the service life of the core component.

The present invention discloses a through-type wheelset detection device and a wheelset detection method, belonging to the field of vehicle engineering technology. A through-type wheelset detection device comprises: a first outer mounting box, a first inner mounting box, a second inner mounting box and a second outer mounting box which are sequentially arranged in a spaced relationship along the track transversely; a first high-speed 2D digital laser sensor and a second high-speed 2D digital laser sensor are arranged in the first outer mounting box, a third high-speed 2D digital laser sensor is arranged in the first inner mounting box, a fourth high-speed 2D digital laser sensor is arranged in the second inner mounting box, and a fifth high-speed 2D digital laser sensor and a sixth high-speed 2D digital laser sensor are arranged in the second outer mounting box. The present invention can accurately obtain the center coordinates and radius of the wheel, the wheel shape parameters and the inner distance of the wheelset through simple measurement and calculation, and has a simple overall structure, reliable principle and high calculation accuracy.

The invention belongs to the technical field of process fault diagnosis, and relates to a process fault diagnosis method based on a two-stage cycle network, which is used for identifying fault types in real time with high accuracy and mainly comprises the following steps: establishing a first-stage fault classifier, grouping faults, establishing a second-stage fault classifier and identifying the fault types. Extracting long-term trend features by using an independent recurrent neural network, and extracting short-term dynamic features through an attention full convolutional network based on compressed excitation and global time attention; establishing a diagnosis difficulty evaluation index, and dividing the fault into a difficult-to-diagnose fault and an easy-to-diagnose fault; the second-stage classifier carries out fine processing on a fault difficult to diagnose, uses principal component analysis statistics to augment a measurement vector, uses robust standardization to improve the model generalization ability, can effectively enhance the classification feature extraction ability, and improves the process fault diagnosis precision. The whole technological process is simple, the principle is reliable, the fault diagnosis effect is good, the application range is wide, logicality is high, and environment friendliness is achieved.

The invention discloses a coaxial double-motor slip-ring-free winding rotor direct connection slip excitation asynchronous power generation system, and belongs to the technical field of wind power generation. The system adopts a coaxial direct connection structure, the main generator (DF) and the auxiliary excitation motor (DJ) operate coaxially, and the capacity of the excitation motor is 25% of that of the main generator. Two rotors are axially and directly connected, and excitation energy is provided by the slip of the excitation motor. The number of turns of the excitation motor rotor winding is set to be larger than that of the generator rotor winding, so that the flow direction of excitation current is reasonable. The double generators run coaxially, the exciter is driven, the generator generates power, frequency, voltage and phase are stabilized automatically by means of electromagnetic negative feedback, and power frequency sine wave electric energy meeting the network access condition is directly output. A traditional IGBT and a high-power converter device are omitted, the system failure rate is reduced, the equipment number complexity and the manufacturing cost are remarkably reduced, the cost per kilowatt-hour is greatly reduced, and the device has the advantages of being free of slip rings, high in abrasion efficiency, long in service life, capable of being connected to and disconnected from a grid and capable of being used in a micro-grid.

The present invention relates to a manual switch electrical life experimental analysis system and experimental method. The experimental system includes a base, a fixed plate, two actuating mechanisms, two static plate assembly clamping mechanisms, a drive assembly clamping mechanism, and an industrial camera dynamic plate assembly clamping mechanism. The dynamic plate assembly, static plate assembly, and drive assembly in the manual switch product can be directly used to perform a manual switch electrical performance simulation experiment and monitor the changes in key parameters during the switch action process in real time, and can achieve fine adjustment of the assembly relationship of the static plate assembly, dynamic plate assembly, and drive assembly in the manual switch product and the drive parameters of the drive assembly. The present invention is mainly used for experimental research on the influence of the assembly relationship of the static plate assembly, dynamic plate assembly, and drive assembly in the manual switch and the user's pressing state on the product's anti-welding ability and electrical life, so as to determine the key factors affecting the anti-welding ability of the manual switch product, and ultimately improve the anti-welding ability and electrical life of the manual switch product.

The invention discloses a method for making high-quality balls by mixing stainless steel ash with carbon for improving element yield. The method comprises the following steps: (1) proportioning materials in balls: the digested stainless steel 300 series dust ash, stainless steel iron oxide scale, dry quenching dust ash, organic binder, inorganic binder and water are proportioned in a mass ratio of 70:5:15:2:3:5; (2) preparing materials; (3) adding water and mixing; (4) stuffing materials; (5) initial pressing; (6) final pressing: the balls produced by initial pressing enter the ball conveying belt through the inclined chute at the bottom of the roller ball press to feed the final pressing ball press; the balls after final pressing enter the ball discharging belt through the inclined screen plate at the bottom of the ball press; the crushed and powdered materials are transported to the initial pressing feeding belt through the return material belt under the screen to continue initial pressing, and the cycle is repeated; (7) transportation.

The present invention proposes a method and system for preparing and characterizing a position-momentum entangled source, which relates to the field of quantum information science. The system includes a pump light generating device, a first beam adjustment component, a multimode optical fiber, a first single-photon detector, a coincidence counter, a second beam adjustment component, a slit, a second single-photon detector, and a short focal length lens. The method uses nonlinear crystals to generate entangled photon pairs with mutually perpendicular polarization directions. The principle of the method is reliable, and efficient EPR entanglement preparation and characterization can be achieved at room temperature. Only one pump light is required, and the system is simple and easy to implement. It can effectively reduce the interference of factors such as random jitter of optical components and improve the entanglement quality.

The present application provides a pneumatic separation system for a launch vehicle and a launch vehicle, the pneumatic separation system comprising: at least one gas cylinder, a gas source output switch and at least one gas cylinder; the gas cylinder is connected to the gas cylinder through a gas charging pipeline, the gas source output switch is arranged on the gas charging pipeline to control the on-off of the gas charging pipeline; the gas cylinder is used to be filled with compressed gas with a preset pressure, and when the gas source output switch is turned on, the compressed gas pushes the to-be-separated structures of the launch vehicle to separate from each other through the pneumatic push rod in the gas cylinder after passing through the gas charging pipeline. When the present application is used in interstage separation, it can avoid the use of solid small rocket ignition to flush the plume of the separated substage body, which is conducive to the recovery and reuse of the separated substage body; it can directly perform performance testing, thereby avoiding the cost of increased production and ground ignition testing for the performance of pyrotechnics in flight tests; the principle is reliable, and it can provide energy for interstage separation, fairing separation and payload separation.

The application relates to the technical field of laser melting forming, in particular to a method for detecting micron-level special-shaped surface structures, which comprises the following steps: step 1, producing standard samples in the same batch in a part processing process, the special-shaped structure size and distribution of the surface of the standard samples are completely consistent with those of other parts; step 2, manufacturing a standard block; step 3, comparing the roughness of the standard sample to be detected and the standard block; step 4, using a three-dimensional profilometer to count the number of special-shaped structures in the standard block specification range at different positions of the standard sample, and comparing the number with that of the standard block; and step 5, according to the comparison results of the roughness and the number of convex structures, determining whether the micron-level special-shaped surface structures meet the design standards. The application has the advantages of reliable principle, strong operability and economy, can effectively detect the effectiveness of the textured structure of an ion thruster discharge chamber part, ensure that the ion thruster discharge chamber can effectively inhibit the peeling of the redundant material film layer, and ensure the reliability of the long-life ion thruster at the end of the service life.

The application discloses a kind of UHV flexible valve group connecting line voltage measurement abnormality detection and switching method, comprising, obtaining control device valve group connecting line voltage measurement value UDM, redundancy device valve group connecting line voltage measurement value UDM_OSYS and abnormality detection auxiliary judgment value UV, obtain the intermediate size value UMID in three;When the difference between UDM and UMID is greater than the first reference value UREF1, and lasts the first delay time T1ref, it is considered that control device valve group connecting line voltage measurement value UDM is abnormal;Redundancy device valve group connecting line voltage measurement value UDM_OSYS or the connecting line voltage value UDMCAL calculated based on the measured electrical quantity of control device is used as the connecting line voltage measurement value UDM0 of control device.The application detects redundancy device valve group connecting line voltage measurement value and abnormality detection auxiliary judgment value to realize the detection of control device valve group connecting line measurement value abnormality, and switches to correct value, maintains system stable operation, principle is reliable, and realization is simple.

The invention discloses a multi-terminal direct current system and a configuration method, a control method and a control device thereof, and the configuration method comprises the steps: configuring alternating current energy consumption in a new energy sending end converter station; the direct-current energy consumption is configured in each receiving-end converter station; the direct-current circuit breakers are arranged on the sides, close to the trunk line, of the branch lines, and the trunk line is not provided with the circuit breakers. The control method comprises the following steps: when a DC line fault occurs in a branch line, action is performed according to a device connected with the branch line; after arc extinction of the direct-current line, restarting and boosting the active step-down converter station, and reclosing the tripped circuit breaker; and after a specified number of times is repeated, when the converter station fails to restart, the converter station of the branch line where the DC line fault is located is locked, the circuit breaker of the branch line where the DC line fault is located is disconnected, and the power is adjusted. According to the invention, AC and DC overvoltage suppression after fault ride-through or locking of the modular multi-level converter is realized, and the operation requirement of a system for sending out new energy through a flexible DC island is met.

The invention discloses a hydrogen energy aircraft fuel cell system emergency inerting system and method based on vortex tube quick-acting nitrogen generation, and belongs to the technical field of hydrogen energy aviation safety, the system comprises an emergency liquid hydrogen supply unit, a vortex tube quick-acting nitrogen generation unit and a gas release unit; the emergency liquid hydrogen supply unit is used for providing high-speed hydrogen jet flow; the vortex tube quick-acting nitrogen generation unit comprises a vortex tube which is provided with a driving gas inlet, a separated gas inlet, a cold end outlet and a hot end outlet; the gas release unit is arranged in the fuel cell equipment compartment and is used for releasing gas; the emergency liquid hydrogen supply unit is connected with a driving gas inlet of the vortex tube, a separated gas inlet of the vortex tube is communicated with the internal space of the fuel cell equipment compartment or a preset gas inlet duct, and a cold end outlet of the vortex tube is connected with the gas release unit. The device has the advantages of high response speed, self-supply of energy and raw materials, simple structure, reliable principle and the like.