1405 results about "Power density" patented technology

The invention provides a permanent magnet motor and a variable-frequency scroll compressor, and relates to the technical field of scroll compressor design and manufacturing, and the permanent magnet motor comprises a stator iron core and a rotor iron core; the stator iron core comprises stator slots which are uniformly distributed along the circumference, copper windings are embedded in the slots, stator yokes which are uniformly distributed are arranged outside the bottom of each slot, each stator yoke is provided with an arc-shaped long slot, stator teeth are arranged between every two adjacent stator slots, and the tops of the stator teeth are sunken to form through-flow slots; the rotor core is internally provided with magnetic steel grooves which are uniformly distributed, two same first magnetic isolation grooves are arranged between two adjacent magnetic steel grooves, magnetic steel is arranged in the magnetic steel grooves, and the top of each magnetic steel is provided with two second magnetic isolation grooves which are symmetrically distributed. The outer side radius Rs1 of the stator core, the inner side radius Rs2 of the stator core and the axial length Lis of the stator core meet the following conditions: 1.282 < = Lis / (Rs1-Rs2) < = 2.778, and 34 < = Rs1-Rs2 < = 39 mm. The power density of the motor can be increased, the cost is reduced, the efficiency is improved, and the harmonic content is reduced so as to suppress torque ripple.

The invention provides a permanent magnet motor and a scroll inverter compressor, and relates to the technical field of scroll compressor design and manufacturing, and the permanent magnet motor comprises a stator iron core and a rotor iron core; the stator core comprises stator teeth and a stator yoke which are uniformly distributed along the circumference, fluid through grooves are formed in the outer side of the stator yoke at the tops of the stator teeth, stator grooves are formed in two adjacent stator teeth and the stator yoke between the two stator teeth, and a plurality of strands of conductive circular enameled wires are embedded in each stator groove; the outer side of the rotor core is composed of linear segments and arcs, air grooves which are evenly distributed are formed in the rotor core, non-uniform magnetic isolation bridges are formed between the air grooves and the linear segments on the outer side of the rotor core, a certain distance is formed between every two adjacent air grooves, parallel magnetic conductive ribs are formed, and permanent magnets with the magnetic field directions changing alternately are embedded in the air grooves. A rivet hole, a lightening hole and a shaft hole are arranged close to the inner side of the rotor core. Therefore, the defined proportionality coefficient Ks is kept in a reasonable range, the power density of the motor can be increased, the cost is reduced, and the efficiency is improved.

The invention discloses a hydrogen cooling superconductive flywheel composite energy storage system, which relates to the technical field of new energy storage and comprises a superconductive flywheel energy storage module, a lithium battery energy storage module, a power conversion module, an intelligent control module, a cooling sub-module and a hydrogen energy recovery module, by combining the quick response characteristic of the superconducting flywheel and the high energy density of the lithium battery, the superconducting flywheel can realize quick energy storage and release by utilizing the friction-free characteristic of the superconducting flywheel, a cooling sub-module and a hydrogen energy recovery module are used, the cooling requirement of the superconducting flywheel is ensured, and meanwhile, energy recovery can be carried out; by utilizing the characteristic of high energy density of the hydrogen battery, the energy storage capacity of the composite energy storage system is further improved, and the limitation of a single energy storage technology on power density and energy density can be effectively solved through the hybrid energy storage system; and more reliable and efficient energy storage support is provided for the fields of power grid peak regulation, renewable energy source grid connection, electric automobiles and the like.

The invention relates to the technical field of flexible direct-current power transmission, in particular to a centralized local energy storage modular multilevel converter MMC-CLES topology which comprises three phase units, each phase unit comprises an upper bridge arm and a lower bridge arm, and each upper bridge arm and each lower bridge arm comprise a bridge arm reactor arranged at one end, close to a power grid, of the bridge arm; a plurality of identical sub-modules SM which are connected to a power grid through a bridge arm reactor; the upper bridge arm and the lower bridge arm form a symmetrical structure; an energy storage sub-module is arranged at the position where the three-phase unit is directly connected with the direct-current bus. According to the invention, the control system is simplified, and the hardware cost and the control complexity are reduced. Voltage stress and current stress are smaller, higher power can be borne, and the high-power capacitor is suitable for being applied to high-power occasions. And moreover, due to the symmetrical layout, the control method is relatively simple, soft switching can be realized, and the power divider can be used as a multi-port component unit.

The invention provides a rotor iron core, a permanent magnet motor and an inverter compressor, and relates to the technical field of motor and compressor design and manufacture, the rotor iron core comprises uniformly distributed permanent magnet grooves, a groove is arranged between two adjacent permanent magnet grooves, each groove extends inwards along the radial direction of the rotor iron core, parallel magnetic bridges are arranged between the grooves and the permanent magnet grooves, and the permanent magnet grooves are connected with the parallel magnetic bridges. A first magnetic barrier groove, a second magnetic barrier groove and a third magnetic barrier groove which are symmetrically distributed are formed in the two sides of the top of each permanent magnet groove respectively, a first arc and a second arc are arranged on the outer side of the rotor core above the magnetic barrier grooves, the second arc intersects with the side edge of the groove, and permanent magnets with alternating magnetism are embedded in the permanent magnet grooves. The radius Rr of the outer side of the rotor iron core, the distance ho from the middle point of the bottom of the permanent magnet groove to the center point of the rotor iron core and the thickness hm of the permanent magnet meet the condition that (Rr-ho) / hm is larger than 2 and smaller than or equal to 3.4. By reasonably arranging the position and the size of the magnetic barrier groove, magnetic circuit distribution can be changed, magnetic flux leakage can be reduced, the power density of the motor can be increased, and electromagnetic vibration noise of the motor and the compressor can be reduced.

The invention discloses an axial flux motor, an electric drive system and a vehicle. The axial magnetic flux motor adopts a single-stator and double-rotor structure in which a stator is arranged in the middle and rotors are arranged on two sides, and comprises a stator assembly, and a first rotor assembly and a second rotor assembly which are distributed on two sides of the stator assembly, and the first rotor assembly and the second rotor assembly are respectively connected with the stator assembly through a first rotor bearing and a second rotor bearing. The single-stator double-rotor axial flux motor only comprises one stator assembly, so that the energy loss is low, the heat productivity is low, the power density is higher, and the energy conversion efficiency is higher. One end of the rotor shaft is fixedly connected with the output part of the first rotor assembly, and the other end of the rotor shaft is in transmission connection with the output part of the second rotor assembly. The tolerance of the relative positions of the two rotor assemblies is smaller, the magnetic poles of the magnetic steel of the two rotor assemblies can be in one-to-one correspondence, and the difficulty of motor calibration after the motor assembly is assembled is reduced.

The invention discloses a liquid cooling heat dissipation control method and device for a high-power charging pile, and the method comprises the steps: obtaining the temperature data of a heating element in the charging pile and external environment parameters, building a dynamic heat load distribution model through a pre-built heat conduction algorithm according to the incidence relation between the temperature data and the charging power, and achieving the heat dissipation of the charging pile. Obtaining heat distribution characteristics; according to the heat distribution characteristics, in combination with a preset heat dissipation efficiency threshold value and a power density requirement in the liquid cooling heat dissipation control system, the cooling liquid flow and the cooling liquid circulation rate under the current working condition are calculated, and a cooling liquid distribution scheme containing a flow distribution proportion and a circulation path is determined; and if it is detected that the external environment temperature in the external environment parameters exceeds a preset threshold range, corresponding environment challenge data are matched from a working condition database, the cooling liquid circulation rate is adjusted, an auxiliary heat dissipation mechanism is activated, and an environment adaptation type heat dissipation mode is generated. The heat dissipation efficiency of the charging pile is improved, precise temperature control is achieved, and therefore safe and stable operation of the charging pile is guaranteed.

The invention discloses a double-closed-loop cooperative control method of a direct-drive electric chassis and a power system, relates to the technical field of power control of electric special vehicles, and provides a rotating speed and torque double-closed-loop cooperative control architecture, and realizes double-core real-time cooperative operation and dynamic optimization of motor output characteristics through a 32-bit processor. A direct-drive transmission structure is combined, a traditional speed reduction device is omitted, a flat wire motor directly drives a rear axle through a transmission shaft, and a four-in-one controller is matched, so that the system loss is reduced by 33%, and the power density is improved by 15%; on the basis of real-time temperature / electric quantity data of a lithium iron phosphate battery management system, control parameters are adaptively adjusted, and the bottleneck of performance attenuation in a low-temperature environment of-35 DEG C is broken through; and a high-voltage interlocking and insulation monitoring module is integrated, and an emergency hydraulic system is automatically switched when an electrical fault occurs, so that multi-stage safety guarantee is formed. According to the technology, the energy recovery efficiency is remarkably improved by 20%, and the wind resistance stability and the extreme environment reliability are effectively enhanced.

Provided in the present invention are a hybrid excited axial brushless motor and a power generation method thereof. The hybrid excited axial brushless motor comprises a housing and a rotating shaft rotatably fixed in the housing. Seven parts, i.e. a first exciter stator, a first magnetic shunt ring rotor, a first permanent magnet rotor, an armature stator, a second permanent magnet rotor, a second magnetic shunt ring rotor and a second exciter stator are successively mounted in the housing in the axial direction, air gaps being provided between every two adjacent parts. The first permanent magnet rotor and the second permanent magnet rotor are symmetrically arranged and are both rotatably fixed to the rotating shaft; the first magnetic shunt ring rotor and the second magnetic shunt ring rotor are symmetrically arranged and are both fixedly connected to the rotating shaft; the first exciter stator and the second exciter stator are symmetrically arranged and are both fixedly connected to the housing. By means of an armature stator support, the armature stator is fixedly connected to the housing. The present invention achieves brushless hybrid excitation, and increases the power density and the power generation capacity of motors.

The invention discloses a magnetic adjusting assembly, a motor, an electric drive system and a vehicle, and the magnetic adjusting assembly comprises a magnetic conductive part which is suitable for being movably disposed on one side of a rotor in the radial direction, so as to adjust the magnetic flux passing through the rotor. According to the magnetic adjusting assembly, the magnetic flux passing through the rotor is adjusted to change the magnetic flux of the magnetic flux short-circuit loop formed by the magnetic conductive piece and the rotor, so that the adjustment of the magnetic flux of the main magnetic field is realized, the adjustment is convenient, and the motor applying the magnetic adjusting assembly has the advantages of a constant torque area and a constant power area; and a constant-power operation region and a high-efficiency region are effectively widened while high torque density and power density are ensured.

The invention belongs to the technical field of robot and intelligent equipment driving, and discloses an integrated servo push rod and a control method.A push rod module is integrally designed, and a high-density motor, a ball push rod and a band-type brake are arranged in the push rod module. The invention has the characteristics of high power density, small volume, high precision, high response speed, low noise, long service life, high reliability and the like. The inside of the push rod is contacted with the deep groove ball bearing at the tail end of the screw rod through the ball retainer, and the outside is contacted with the oil-free bushing, so that the lateral strength of the push rod is improved, friction is reduced, and operation efficiency is improved. A linear encoder is arranged at the end of the screw rod, accurate control of the tail end can be achieved, a magnetic encoder is arranged at the tail end of the motor, input and output end double-closed-loop can be achieved, precision can be improved, and errors of band-type brake in power-off response time can be compensated; the lead screw is connected with the motor through the diaphragm coupling in the motor, so that the axial space is saved, and the service life of the motor is prolonged.

The invention provides a new energy ship energy storage battery system and a control method, and the method comprises the steps: carrying out the electric quantity detection of a target capacitor bank, obtaining the first electric quantity rise time, and predicting the second electric quantity rise time of the target capacitor bank; extracting a power density characteristic in the charging power density sequence, and comparing the power density characteristic with a capacity rising characteristic of the target capacitor bank to obtain the battery convection energy efficiency of the energy storage battery system of the new energy ship; determining target required power of the energy storage battery system based on the current ship navigation state and the static load power; adjusting the discharge state of the energy storage battery pack according to the target demand power and the convection energy efficiency, and correcting a power control parameter when the target capacitor bank is charged according to the first electric quantity rise time and the second electric quantity rise time, so that the response speed of a power controller can be improved when the electric quantity rise speed of the target capacitor bank is relatively slow; and the dynamic performance of the ship is improved under the working condition of frequent load fluctuation.

The invention relates to a high-power-density marine split-type permanent magnet shaft generator, which comprises a split-type stator, a split-type rotor and a cooling chamber, and is characterized in that a circulating water channel is arranged on the outer wall of a base of the split-type stator and is connected through a cooling water pipe; an air inlet and an air outlet are formed in two ends of the base; the cooling chamber is integrated at the top of the generator; the split-half rotor comprises a permanent magnet, a rotor core, a rotor support and an expansion sleeve. The rotor core is provided with a plurality of ventilation holes in the axial direction. The generator adopts a stator surface water cooling and forced air cooling mixed cooling system, and a water cooling channel and an air cooling channel operate independently and dissipate heat cooperatively. Through the structural design of the generator, the stator and the rotor of the generator are fully cooled, the heat dissipation efficiency of the generator is improved, and the power density of the generator is improved. A generator rotor permanent magnet is of a tangential structure, and the power density of the generator is further improved. And the ventilation holes are axially added to the rotor iron core, so that the weight of the rotor is reduced, and the influence on the original shafting of the ship is reduced.

The invention discloses a transformer magnetic integration structure integrating double direct current inductors and leakage inductors and an integration method of the transformer magnetic integration structure. In order to solve the related problems that in an existing magnetic integration method, a magnetic core structure is complex in design and large in leakage magnetic flux, and an integration method lacks universality and the like, a single standard EE magnetic core is used for a common type converter with three magnetic element structures including a direct-current inductor, a leakage inductor and a transformer, the winding connection mode and the air gap parameters are reasonably designed, and the magnetic core structure is optimized. Compared with a discrete magnetic part, the number of magnetic elements of the converter can be reduced, the volume proportion of the magnetic part in the converter can be reduced, the volume of a converter system is further reduced, the power density is improved, the magnetic core design is simplified, and the manufacturing complexity of a magnetic integrated structure is reduced; unbalanced current of column windings on the two sides is suppressed, efficient and high-power-density operation of the system is achieved, and stability and reliability of operation of the system are improved.

The utility model discloses a motor, a compressor and refrigeration equipment, the motor comprises a stator, the stator comprises a stator iron core and a winding, the stator iron core is provided with a plurality of stator teeth, the winding is wound on the stator teeth, and a stator slot is defined between two adjacent stator teeth; the rotor is arranged in an inner cavity of the stator, the rotor comprises a rotor iron core and magnets, the rotor iron core is provided with a plurality of installation grooves, the installation grooves are arranged at intervals in the circumferential direction of the rotor iron core, the magnets are suitable for being installed in the installation grooves, the number of stator grooves is Q, the number of poles of the rotor is 2p, the phase number of the winding is m, the outer diameter of the stator is D1, the inner diameter of the stator is D2, and GCD (Q, G, D) is smaller than Q; 2p) is the largest common divisor of the number of the stator slots and the number of the poles of the rotor and satisfies Q / (2pm) lt; 1, 11.2 < = (D2 / D1) (GCD (Q, 2p)) 2 < = 16.5. According to the motor provided by the embodiment of the utility model, the power density of the motor can be improved and the vibration noise of the motor can be reduced by limiting the largest common divisor of the stator slots and the rotor poles and the inner and outer diameters of the stator.

The invention relates to the technical field of hybrid aircrafts, and discloses a high-power take-off energy supply system for a hybrid aircraft based on superconducting magnetic energy storage, which is characterized in that a superconducting coil is directly soaked in a hydrogen storage tank of the aircraft, and a large amount of liquid hydrogen carried by the aircraft is used as a cold source of the superconducting coil; the weight of a refrigerating machine and a heat preservation tank which are necessary for original superconducting magnetic energy storage is saved; when the aircraft is in a scene with low power requirements such as level flight or landing, the power generated by the superconducting generator driven by the gas turbine is greater than the power required by the aircraft, and at the moment, the superconducting coil can be charged to realize energy recovery and storage; under the scene of high power demand such as takeoff, the advantages of high power density, high response speed and the like of the superconducting coil are utilized to provide electric power for the propulsion unit so as to meet the high-power demand of the aircraft in the stages such as takeoff and the like, and the high-power maneuvering, electric energy management and transmission capabilities of the hybrid aircraft are greatly improved.

The invention belongs to the field of brushless doubly-fed motor control, and particularly discloses a low-bus-capacitor brushless doubly-fed direct-current power generation system direct-current voltage ripple suppression device which comprises a brushless doubly-fed direct-current power generation system, a machine-side converter control system and a direct-current voltage ripple suppression control system. The machine-side converter control system is connected with the machine-side converter and is used for controlling the direct-current bus voltage and suppressing harmonic voltage of a first target number of times of the direct-current bus voltage by adopting a control winding harmonic current compensation method; the direct current voltage ripple suppression control system is connected with the direct current bus and is used for separating harmonic voltage of a first target number of times of the direct current bus voltage and obtaining a harmonic current reference value of a second target number of times of the control winding; the active suppression of the direct-current bus voltage ripple is realized by integrating the harmonic voltage and the harmonic current reference value of the direct-current bus voltage. According to the invention, the system power density is ensured, and the electric energy quality is improved.

The invention relates to the technical field of energy storage and power supply, in particular to a frequency optimization control method of a composite energy storage system based on a virtual synchronous machine. High-frequency disturbance quick response is achieved through the high-power density characteristic of the super-capacitor, through dynamic power distribution, the super-capacitor preferentially bears more than 80% of power fluctuation in a high-frequency small-disturbance scene, frequent charging and discharging of the lithium-iron battery are avoided, the lithium-iron battery participates in long-term adjustment in a low-frequency large-deviation scene, and in combination with assistance of the super-capacitor, high-frequency disturbance quick response is achieved. The system frequency recovery time is shortened, decoupling control of energy type and power type energy storage is achieved through the DC / DC converters in the sub-modules, the direct current bus voltage is kept stable, meanwhile, the discharge depth of the lithium iron battery and the super capacitor is improved, and the overall capacity requirement and cost of the energy storage system are reduced.

The invention relates to the technical field of power electronics, and discloses a single-stage bidirectional DC / AC converter and a control method thereof. The single-stage bidirectional DC / AC converter comprises a pre-stage circuit and a post-stage circuit which are multiplexed by a switching tube. Wherein the pre-stage circuit is an L-LLC resonant converter or a CLLC resonant converter, and the post-stage circuit is an interleaved Buck converter. And an output inverter bridge at the secondary side of the transformer is replaced by a bridgeless structure. According to the single-stage bidirectional DC / AC converter, the number of switching tubes is reduced through a multiplexing technology, the topological structure can be simplified, the stability is improved by reducing the damage probability, and the cost is reduced; furthermore, by utilizing a soft switching technology of a pre-stage circuit, ZVS of four primary-side switching tubes and half secondary-side switching tubes can be realized, the switching loss is greatly reduced, and the working efficiency is improved; an output inverter bridge is omitted, the number of switching tubes can be further reduced, and the power density and the working efficiency are improved.

The invention relates to the technical field of data processing, and discloses a new energy intelligent box-type substation operation monitoring method and system. The method comprises the following steps: carrying out functional division on a substation space according to a new energy access capacity to obtain a power density distribution parameter; denoising the electrical parameters through wavelet transform to obtain purified operation data; establishing a fuzzy feature analysis model to obtain an equipment operation state fuzzy feature vector; calculating new energy output-load coupling characteristics to obtain a power fluctuation abnormal factor and a local abnormal factor; and training and processing the local abnormal factors through a BP neural network to obtain an equipment fatigue accumulation monitoring result. According to the invention, by establishing the equipment fatigue monitoring system based on the new energy power fluctuation abnormal factors and the BP neural network, the accuracy of new energy substation equipment state evaluation and the timeliness of fault early warning are improved.

According to the control circuit and the control method of the vehicle charger disclosed by the invention, the rectifier bridge of the bridge PFC is removed, so that the number of switching devices is reduced, the topological cost is reduced, and the loss is reduced; power factor correction is realized through average current control, and stable 400V direct current is output for post-stage power supply after power grid side 220V alternating current is rectified; the rear-stage resonant converter is highly symmetrical in structure and has the advantages of high power density, strong energy interactivity, input and output isolation and easy realization of soft switching; a hybrid modulation strategy is adopted for the resonant converter, frequency modulation and extended phase shift segmented modulation are adopted under the normal load condition, the problem that the frequency modulation range is narrow during voltage reduction is solved, intermittent Bang-Bang charge control is switched under the light load condition, and the problems that the output voltage drift is high and the efficiency is reduced during light load are solved; therefore, the charging efficiency of the vehicle-mounted charger is improved.

The invention provides a battery structure design method. The method comprises the following steps: acquiring a target theoretical capacity of a to-be-designed battery; generating a plurality of target structure parameter combinations corresponding to the target theoretical capacity through the constructed battery simulation platform, wherein each target structure parameter combination comprises the following structure parameters: electrode thickness, hole depth, hole diameter, pore volume fraction and active substance volume fraction; constructing an initial population by taking each target structure parameter combination as an individual, constructing a fitness function by taking the minimum error between the discharge capacity predicted by the trained agent model and the target theoretical capacity as a target, and performing iterative optimization in the initial population based on the fitness value corresponding to each individual in combination with an improved genetic algorithm, and outputting an optimal target structure parameter combination after iteration is completed. Therefore, the structural design parameters of the battery can be quickly and accurately optimized, the performance and efficiency of the battery are improved, and the balance between the energy density and the power density is realized.

The invention relates to the technical field of power generation and energy storage of a power system, and discloses a wind-solar-energy-storage combined power generation system based on hybrid energy storage and an optimal scheduling method. The system comprises a wind power plant, a photovoltaic power station, a storage battery energy storage power station, a waste mine pumped storage power station, an inverter and a related contact device, the wind power plant and the photovoltaic power station convert wind energy and solar energy into electric energy, after the electric energy is converted into alternating current through an inverter, the alternating current and electric energy of the storage battery energy storage power station and the abandoned mine pumped storage power station are connected into a power grid through a bus, a transformer and other devices, and an external power grid serves as a standby power source. And an intelligent monitoring and management unit is also configured and is used for monitoring the operation states of the power generation units and the energy storage units in real time and carrying out data analysis and prediction so as to provide a decision basis for optimal scheduling. The storage battery energy storage power station in the system is used as power type energy storage and has the advantages of being high in response speed and high in power density.

The invention discloses a control method and system for a single-stage three-port V2G charging device, and relates to the technical field of charging pile converters, and the method comprises the steps: constructing a structure of a three-port converter, and obtaining a working mode of the converter; a phase shift control mode is adopted between the ports and between the two bridge arms of the full-bridge circuit; bidirectional power flow of energy between a power grid and a new energy automobile battery is completed, and multifunctional charging and discharging management is achieved. The converter is of a single-stage structure and has high power density, and flexible and bidirectional power exchange between alternating current and direct current ports can be achieved without a two-stage structure. In order to improve the efficiency of the converter, a phase shift angle is calculated by taking power as a constraint condition and taking current stress and soft switching as optimization targets, a three-port converter optimization modulation strategy which is suitable for the topology and takes a wide soft switching range and low current stress into account is designed, and efficient and reliable operation of the converter in three working modes of V2G, G2V and H2L can be realized.

The invention discloses a wire connecting structure of a flat wire stator, and belongs to the technical field of energy-saving motors, the wire connecting structure comprises a stator core and a stator slot, a winding is arranged in the stator slot, the stator core and the winding form a stator, the stator is a concentrated winding type stator, the longitudinal section of the winding is of an octagonal structure, and the winding is arranged in the stator slot. And the left and right sides of the windings can be broken to reduce the number of used molds and reduce the winding difficulty of the windings, and one end of each of two outgoing lines of each group of windings is on the outer diameter side of the stator while the other end is on the inner diameter side of the stator. According to the wire connecting structure of the flat wire stator, the cross section of the winding is of an octagonal structure, folding can be carried out on the two sides, the number of molds can be reduced, the winding difficulty of the winding can be reduced, compared with a traditional winding with a rectangular cross section, the slot fullness rate can be increased by 4%-8%, the end space is small, the number of opened molds is reduced, the winding difficulty of the winding is reduced, the cost is reduced, and the slot fullness rate, the power density and the efficiency are high.

According to the motor, the power system based on the motor and the adjusting method, convex ribs are arranged on an end plate of a rotor, the rotor is used for driving the convex ribs to rotate and driving cooling lubricating oil to form forced circulation in an air gap, the heat transfer efficiency of the rotor and a stator is remarkably enhanced, and the temperature rise of the rotor and the demagnetization risk of a permanent magnet are effectively controlled; meanwhile, the lubrication condition of moving parts is improved, and energy consumption and complexity caused by an extra oil pump are avoided; through the integrated design of the motor shell and a half box body of the gear box and the communicating oil duct of the sealing plate and the gear box, a shared lubricating system is constructed, cooling lubricating oil circulation sharing and heat dissipation cooperation are achieved, the overall structure is simplified, and the system reliability is improved; on the premise that the size and the weight are not increased basically, the comprehensive benefits of improving the heat dissipation performance, simplifying the system structure and reducing the manufacturing cost are synchronously achieved, and the power module is particularly suitable for application scenes with limited space and high power density requirements.

The invention discloses a method for activating a proton exchange membrane fuel cell. The specific process is as follows: S1) preparing a small molecular organic acid solution with a certain concentration; s2) introducing the solution prepared in the step S1 into a fuel cell according to a certain flow rate, and activating for a certain time; s3) after activation of the small molecular organic acid is completed, flushing the fuel cell with deionized water for 2-3 times; s4) connecting the fuel cell to a fuel cell test system, purging the fuel cell with N2, and setting the temperatures of the humidifier, the gas path pipeline and the cell at the same time; s5) after reaching the specified temperature, replacing the reaction gas air and H2, testing an I-V curve, and determining the maximum current; s6) activating for a certain time under the maximum current density; s7) after activation is completed, an I-V curve is obtained through testing, and the limiting current density and the peak power density can be obtained.According to the method, the proton exchange membrane fuel cell is subjected to small-molecule organic acid activation through the efficient method, and compared with a traditional activation method, the limiting current density and the peak power density of fuel cell operation are obviously improved.

The invention discloses a modular alternating support current converter without a bridge arm inductor and a modulation method thereof, and relates to the technical field of power electronics. According to the modular alternate support converter, a new modular alternate support converter topology is provided by reconstructing an operation mode of a traditional MMC, and the modular alternate support converter comprises three phase units; each phase unit comprises an upper bridge arm and a lower bridge arm which are connected in series; each bridge arm comprises N submodules which are connected in series; two ends of each phase unit serve as positive and negative poles of a direct-current end; the midpoint of the phase unit is connected with an AC filter inductor as a connecting end of three-phase power; the anode of the DC end is provided with a DC filter inductor. According to the modularized alternating supporting converter, a filter inductor does not need to be additionally arranged on a bridge arm, the modularized alternating supporting converter has the large capacity reduction amplitude and power density, the size is small, the power density is high in the corresponding alternating operation mode, the engineering implementation difficulty is low due to the full-modularized design, and good economical efficiency is achieved.

The invention relates to the technical field of capacitors, and discloses a high-energy-density capacitor which is characterized in that a positive electrode is composed of a composite active material, a conductive agent and a binder, the composite active material comprises a mixture of nitrogen-sulfur co-doped carbon foam magnetic microspheres and iron sesquioxide nanodot at nitrogen-doped graphene, and the conductive agent is a mixture of nitrogen-sulfur co-doped carbon foam magnetic microspheres and iron sesquioxide nanodot at nitrogen-doped graphene. The preparation method of the nitrogen-sulfur co-doped carbon foam magnetic microspheres comprises the following steps: by taking polyacrylonitrile as a carbon source, thiourea as a sulfur source and ferric nitrate as an iron source, carrying out hydrothermal reaction and then carrying out carbonization treatment at 800-1000 DEG C for 2-4 hours; the energy density of the high-energy-density capacitor can reach 700-800 Wh / kg, the power density is larger than or equal to 10 kW / kg, compared with a traditional super capacitor, the high-energy-density capacitor has the advantages that the energy density is remarkably improved, and the application requirements of the fields with high requirements for energy and power such as electric automobiles and intelligent power grids can be met.

The invention discloses a cable full life cycle health state prediction analysis method and system, and relates to the technical field of cable state monitoring, and the system comprises a power supply management module, a health comprehensive analysis module, and an adaptive sampling communication module. The power supply management module collects an electric parameter flow, generates an instantaneous power density sequence, and detects parameters such as a charge-discharge state, an output power failure type, energy supply reliability and the like in combination with historical and real-time data; the health comprehensive analysis module dynamically calculates a sampling power consumption budget, predicts an output energy curve and a risk level through graph time sequence fusion, and determines a recommended sampling level after correction; the adaptive sampling communication module maps a layering strategy and dynamically executes sampling and communication scheduling; the system solves the problem of adaptive sampling strategy matching in multi-node high-voltage distribution network monitoring, realizes accurate monitoring and strategy adaptation under differentiated aging, and improves the cable health management efficiency and reliability.