142 results about "Power cycle" patented technology

The present application provides a method and system for predicting the remaining service life of an IGBT device, comprising: simulating an IGBT device power cycle aging experiment, collecting conduction voltage drop historical data on the basis of the experiment, and respectively obtaining a model parameter empirical value and a model parameter estimated value on the basis of the conduction voltage drop historical data; constructing a first state weight on the basis of the current operation state, and performing smooth adjustment on the model parameter estimated value on the basis of the model parameter empirical value and the first state weight to obtain a parameter correction result; and establishing a state transition equation on the basis of the parameter correction result, and predicting the remaining service life of an IGBT device on the basis of the state transition equation. Use of the present application can improve the accuracy of prediction of the remaining service life of the IGBT device.

The invention provides a supercritical carbon dioxide power generation working medium pressure adjusting system, belongs to the technical field of power generation system working medium pressure adjusting, and can at least partially solve the problems that in the existing unit start-stop and load adjusting process, the system pressure is greatly changed, normal operation of a unit is affected, and the working efficiency is low. The system comprises a power generation module, and the power generation module comprises a compressor and a heat regenerator connected with the compressor through a pipeline; the carbon dioxide working medium circulating system is provided with the gas storage tank, part of the carbon dioxide working medium is stored in the gas storage tank through the differential pressure of the high-pressure part and the low-pressure part of the circulating system, the working quality of the circulating system is adjusted, and the carbon dioxide working medium circulating system has the advantages of being simple and convenient to operate.

A test method and apparatus for bipolar degradation of a diode, and a device. The method comprises: respectively performing static characteristic tests on a first diode and a second diode, so as to obtain a first static characteristic test result and a second static characteristic test result; setting a pulse test current, a pulse test time and a pulse cycle time, so that, on the basis of the pulse test current, the pulse test time and the pulse cycle time, a power semiconductor pulse current test device performs repeated short pulse current power cycle tests on the first diode under normal temperature conditions, and performs repeated short pulse current power cycle tests on the second diode under high temperature conditions; then, performing static tests, so as to obtain a plurality of static characteristic test results; and on the basis of the static characteristic test results, obtaining a bipolar degradation test result of a diode. By means of the method, bipolar degradation of the diode is tested, and the accuracy and reliability of the test result are improved.

Systems and techniques may be used for incorporating direct air carbon dioxide capture capabilities into a working fluid condensing process of a geothermal power plant. An example technique may include causing, using fans, air to flow across condenser coils of a condensing unit, through which power cycle working fluid is circulated, and through a direct air capture (DAC) filtration component, which separates carbon from the air, capturing heat from a geothermal working fluid, and using the heat as thermal energy input to the DAC filtration component or using electrical energy generated from the geothermal power plant as electrical energy input to power the condensing unit and the DAC filtration component. The example technique may include gathering the carbon separated from the air to be injected into a geothermal reservoir or repurposed for another industrial process.

A method for verifying unsafe_shutdowns based on ssd power-off restart hybrid test, the control machine carries out power-off, restart test scene to nvme ssd, the python script of control machine issues admin command to obtain the initial value of unsafe_shutdowns in smart log, then carries out power-off, restart test, reacquires the parameter value of unsafe_shutdowns after each power-on, and views whether unsafe_shutdowns is consistent with the number of different breaks through calculation.This application verifies the parameter value of unsafe_shutdowns based on power-off, restart hybrid test, and achieves two goals at one time, which verifies the reliability of ssd disk and the correctness of smart parameter value.

The application discloses a kind of based on DC pulse's enhanced toughening Ti-6Al-4V alloy and preparation method thereof.Method includes that hot working state Ti-6Al-4V alloy plate is cut into tensile specimen, after mechanical grinding, ultrasonic cleaning, constant temperature drying, by power connection DC pulse processing, by relay accurately control electric pulse action duration, by changing a series of electric pulse action duration and current density, obtain the enhanced toughening Ti-6Al-4V alloy under different DC pulse conditions, and obtain the comprehensive mechanical properties of Ti-6Al-4V tensile specimen.By the efficient DC pulse processing method provided by the application, the extremely short power cycle of microsecond level, and simple and convenient operation, significantly improve the yield strength, tensile strength and elongation of Ti-6Al-4V alloy.

An apparatus includes a relay configured to control a flow of electricity from a power supply to an electronic device, a relay controller configured to control an operation of the relay, and a sensor communicatively connected to the relay controller and configured to measure a power consumption of the electronic device. The relay controller is configured to detect a cessation of the power consumption of the electronic device based on signals from the sensor and cause the relay to power cycle the electronic device in response to detecting the cessation of the power consumption.

The application discloses a low power distribution capacity, wide adaptation type three-winding energy closed-loop power cycle test platform, and belongs to the technical field of power electronic equipment testing, which comprises a three-winding transformer having a primary winding and two independent secondary windings; a rectifying device is connected between the first secondary winding and a first DC bus, an inverting device is connected between the second secondary winding and a second DC bus, a DC-DC conversion device is connected between the two DC buses; the platform further comprises three sets of layered control systems which independently control the rectifying device, the inverting device and the DC-DC conversion device, so that the rectifying device transmits active power from the first secondary winding to the first DC bus, the inverting device feeds back active power from the second DC bus to the second secondary winding, and the magnetic motive forces of the two sets of secondary windings are mutually offset in the iron core. The application greatly reduces the power distribution capacity, realizes decoupling and independent voltage regulation of the rectifying side and the inverting side, and is compatible with test of arbitrary ratio DC-DC devices.

Systems and techniques may be used for incorporating direct air carbon dioxide capture capabilities into a working fluid condensing process of a geothermal power plant. An example technique may include causing, using fans, air to flow across condenser coils of a condensing unit, through which power cycle working fluid is circulated, and through a direct air capture (DAC) filtration component, which separates carbon from the air, capturing heat from a geothermal working fluid, and using the heat as thermal energy input to the DAC filtration component or using electrical energy generated from the geothermal power plant as electrical energy input to power the condensing unit and the DAC filtration component. The example technique may include gathering the carbon separated from the air to be injected into a geothermal reservoir or repurposed for another industrial process.

This invention is titled "A Test Platform and Test Method for Dynamic Testing of IGBTs," belonging to the field of IGBT testing technology. It primarily provides a fully dynamic IGBT test platform. Its main features are: a test platform composed of a control unit, a main circuit unit, a frequency adjustment unit, and a power cycle control unit; the tested unit is two IGBTs equipped with thermistors; the two IGBTs are respectively mounted in a fixture platform with cooling function; a set operating current and operating frequency, alternately output from a DC power supply, are applied to the two IGBTs respectively; when the IGBT junction temperature reaches the set upper limit, the operating current of the IGBT is cut off, and the IGBT is cooled until its junction temperature reaches the set lower limit, and this cycle is repeated to complete the high-frequency power cycle test. This invention features simple operation and the ability to independently set the IGBT's operating current, operating frequency, and heat dissipation conditions. It is mainly used to evaluate the operating status of IGBT products under different current, frequency, and heat dissipation conditions in simulated IGBT application conditions.

This invention provides a method and system for predicting the remaining lifetime of power devices based on solder layer crack length propagation. The remaining lifetime prediction method includes: establishing a finite element two-dimensional model / finite element three-dimensional model; dividing the chip solder layer model in the finite element two-dimensional model / finite element three-dimensional model into K cells; sequentially executing the first aging stage, the second aging stage, ..., the (S+1)th aging stage to obtain the junction-to-case thermal resistance of the power device at the completion time of the kth aging stage; the solder layer crack length increases with the number of failed cells; real-time monitoring of the power cycle count of the power device in actual tests and the junction-to-case thermal resistance of the power device corresponding to the power cycle count, determining which interval the current junction-to-case thermal resistance of the power device belongs to, and then using the corresponding formula to calculate the number of power cycles required from the current monitoring of the junction-to-case thermal resistance to the failure of the chip solder layer.

The application discloses an energy management system of a power cycle system, wherein the power cycle system is a combined power cycle system of a gas turbine and a fuel cell, and the energy management system comprises a fuel pump, a fuel distributor, a cold end heat exchanger, a cooling cycle loop and a hot end heat exchanger; and a control system is used for controlling the fuel pump, the fuel distributor and a circulating pump in the cooling cycle loop, wherein a fuel flow is obtained based on a required power of the power cycle system, a rotating speed of the fuel pump and an opening degree of the fuel distributor, a hot end heat exchanger heat is calculated through heat balance based on the fuel flow, and a cooling effect of the cooling cycle loop is realized based on the hot end heat exchanger heat and the rotating speed of the circulating pump. The application can simultaneously meet the energy saving and emission reduction and weight control requirements of an aircraft, and also solves the problem that the system power density is limited by the heat dissipation capacity.

A refrigeration cycle is connected to a supercritical carbon dioxide (sCO2) power cycle by incorporating a CO2 condenser which is also the refrigeration cycle evaporator. The heat rejected by the carbon dioxide is absorbed by the refrigerant in the CO2 condenser. Work is done on the refrigerant to raise its temperature above the local ambient temperature. The heat absorbed from the power cycle and the work required to raise the refrigerant temperature is rejected to the ambient environment, which may be either air, earth, or water. This results in improved efficiencies in carbon dioxide power cycles without regard to the ambient temperature by forcing a transcritical phase change even when ambient temperatures are above the carbon dioxide critical point. A two-phase heat transfer on both sides of the CO2 condenser further improves efficiency of the sCO2 power cycle.

The application provides a SOFC-Allam coupled zero-carbon emission power cycle system, and belongs to the technical field of power cycle systems. The application at least partially solves the problems that the existing SOFC tail gas often contains incompletely utilized fuel, and the tail gas still contains a large amount of residual heat due to the high working temperature of the SOFC, which leads to low overall energy utilization rate of the SOFC and great influence of tail gas emission on the environment. The application comprises a working medium pretreatment unit, a fuel reforming unit, a solid oxide fuel cell and a tail gas energy recovery unit. The fuel reforming unit is connected with the working medium pretreatment unit. The tail gas energy recovery unit comprises a combustion device, a turbine and a turbine exhaust unit. The application uses turbine exhaust to heat the working medium through a preheater, improves the working medium temperature, and further improves the system efficiency. The heat energy of the turbine exhaust is recycled in multiple stages. The incompletely consumed fuel in the anode of the fuel cell is completely combusted in the burner, thereby avoiding fuel waste.

The present application relates to a kind of life prediction method and system considering IGBT module bonding wire failure.The method includes determining the health state of IGBT module according to the online monitoring data of IGBT module;Online monitoring data includes: the number of broken bonding wire;When IGBT module is healthy module, directly obtain transient impedance curve, and determine RC thermal network model according to transient impedance curve, and then carry out power cycle experiment, realize life prediction;When IGBT module is aging module, according to the transient thermal impedance measurement test measured IGBT module current transient thermal impedance curve, and determine the current RC thermal network model using current transient thermal impedance curve, and then carry out power cycle experiment, realize life prediction.The present application can improve the accuracy of life prediction result of IGBT module.

The invention discloses a cogeneration system based on a CO2 working medium and an implementation method of the cogeneration system, and belongs to the field of geothermal energy development. The system comprises a deep well heat exchange module, a heat exchange heat supply unit, a transcritical CO2 low-temperature power generation module, a gas-liquid separator, a ground cooling part, a variable coupling power module, a micro-power circulation module and a control system. Heat of a deep geothermal well is absorbed by liquid-phase CO2 through the well bottom and then is fed to the well, heat exchange is conducted through the heat exchange heat supply unit, the heat enters the transcritical CO2 low-temperature power generation module and is converted into electric energy for power generation, the micro-power circulation module is pushed through the variable coupling power module, and the liquid-phase CO2 is pressurized and pumped into the well; according to the invention, the whole heat and power cogeneration system can stably operate for a long time under the unattended or few-person attended condition; the method is not only suitable for a single well mode, but also can be expanded to a twin-well or multi-well network structure. The invention is applied to medium and low temperature terrestrial heat or waste heat occasions, waste oil and gas well transformation power generation, intelligent microgrids, comprehensive energy bases and the like.

The present application relates to the technical field of energy storage, and discloses an energy storage system coupling a high-temperature heat pump and compressed air, which comprises a steam turbine power cycle subsystem, a high-temperature heat pump subsystem, a non-combustion compressed air energy storage subsystem and a molten salt heat storage system; steam turbine exhaust is used as a low-temperature heat source of the high-temperature heat pump, a steam turbine condenser is omitted, the temperature of the low-temperature heat source of the heat pump is raised to reduce the temperature difference and improve the COP of the heat pump; the molten salt heat storage is used as a unified high-temperature heat source, which drives the steam turbine to generate power, heats the air before the expansion of compressed air, and absorbs the excess high-temperature heat of the heat pump. The present application effectively improves the energy efficiency of the heat pump and the power generation efficiency of compressed air, realizes efficient energy utilization, and is suitable for new energy consumption and long-time peak regulation of the power grid.

The invention discloses a digital control method for a split-phase voltage-regulating voltage stabilizer based on silicon controlled gear switching, and relates to the technical field of voltage-regulating voltage stabilizer control. The method comprises the following steps: executing closed-loop control in each power supply cycle in a gear switching transition period: pre-judging a circulation increment according to initial trigger angles of a new gear and an old gear, and comparing the circulation increment with a safety threshold; if the threshold is exceeded, calculating a critical overlapping starting angle, segmenting an overlapping conduction interval by taking the critical overlapping starting angle as an anchor point, calculating a residual ratio, and selecting a segmentation correction strategy to correct the initial trigger angle; calculating an effective energy transmission proportion reflecting an actual transition progress based on the corrected trigger angle, and adaptively generating a target weight of a next power cycle based on the effective energy transmission proportion; monotonicity and saturation constraints are applied to the target weight to obtain an execution weight, the execution weight is mapped into an initial trigger angle of a next power supply cycle, and a cycle-by-cycle closed loop is formed; and when the execution weight reaches a final value, executing steady state locking to complete switching. The circulating current is safe and controllable, and the transition process is smooth and free of impact.

A network device may include processing circuitry configured to record diagnostic data onto memory circuitry after a network device power-on event associated with a power cycle. The diagnostic data may include system console log output, hardware state information, and / or other types of diagnostic data obtained after the network device power-on event.

The invention provides a data center integrated thermoelectric circulation heat dissipation system and a control method thereof. The system comprises a cooling tower, a circulating pump, a pressure transmitter, a flow meter, a control module, a cooling liquid circulating pipeline, a throttling valve, a thermocouple and a thermoelectric circulation module. The cooling tower, the circulating pump and the thermoelectric circulation module are sequentially connected through a cooling liquid circulating pipeline, and the energy storage and heat dissipation integrated vapor chamber is electrically connected with a double-control switch, a single-control switch, an axial flow fan and a storage battery of the thermoelectric circulation module to form a thermoelectric circulation module electric control loop. The energy storage and heat dissipation integrated vapor chamber and the micro-channel heat exchanger are connected through a plurality of heat pipes to form a thermoelectric circulation module heat dissipation loop, and thermoelectric circulation modules are connected in parallel through cooling liquid circulation pipelines. According to the invention, through the thermoelectric circulation module, the high heat dissipation uniform temperature performance of the heat dissipation system is ensured, the recycling of electric energy is realized, and the energy consumption of the data center is effectively reduced in combination with a step-by-step air cooling-liquid cooling heat dissipation mode.

An energy storage system converts variable renewable electricity (VRE) to continuous heat at over 1000° C. Intermittent electrical energy heats a solid medium. Heat from the solid medium is delivered continuously on demand. Heat delivery via flowing gas establishes a thermocline which maintains high outlet temperature throughout discharge. The delivered heat which may be used for processes including power generation and cogeneration. In one application, the energy storage system provides higher-temperature heat to a conventional lower-temperature heat source to boost the temperature of a thermal power cycle working fluid to a turbine, thereby increasing efficiency of the power cycle.

The application belongs to the technical field of refrigeration, heat pump and low-boiling power cycle, and discloses a mixed refrigerant for replacing R290. The mixed refrigerant comprises a first component, a second component and a third component, wherein the first component is hexafluoropropylene (R1216) with a mass ratio of 45% to 70%, the second component is propane (R290) with a mass ratio of 27% to 47%, and the third component is monofluoroethane (R161) with a mass ratio of 3% to 8%. The mixed refrigerant provided by the application is used for replacing R290, has a GWP value of not more than 5, and has obvious advantages in safety in that the flammability is obviously weaker than that of R290. The thermodynamic performance of the mixed refrigerant of the application is equivalent to or even better than that of R290, and the mixed refrigerant can completely replace R290 to be used in refrigeration, heat pump and low-boiling power cycle system, and has wide application prospect.

The present application belongs to the technical field of comprehensive energy utilization, and relates to a multi-energy co-production carbon dioxide power cycle system and method thereof, comprising a gas storage bin, a first compressor, a first cooler, a liquid storage tank, a first turbine and a post-preheater, a hot water supply unit, a waste heat recovery unit and a cold energy recovery unit. The present application supplies hot water through the hot water supply unit to absorb the heat generated by multi-stage compression of carbon dioxide to obtain steam to supply steam to users, and absorbs and stores waste heat of the system through cooperation of the waste heat recovery unit and the hot water supply unit to heat carbon dioxide after expansion and work, and recovers cold energy in the carbon dioxide after expansion and work through the cold energy recovery unit to supply cold water or make ice to users, so that waste heat and cold energy of the power cycle process can be recovered, and steam and cold energy including electric energy are output, which not only reduces system energy consumption, but also improves energy utilization efficiency of the system.

The application belongs to the technical field of aviation electromechanical systems, and discloses a laser energy system based on supercritical CO2 power generation technology and a working method thereof. The system comprises a high-speed starting / generating motor, a SCO2 power device, an AC / DC rectifier, a lithium battery and a super capacitor. The high-speed starting / generating motor is driven by the SCO2 power device. The electric energy generated by the high-speed starting / generating motor is stored in the lithium battery after being rectified by the AC / DC rectifier, and the high-speed starting / generating motor and the lithium battery supply power to the super capacitor. The SCO2 power device is as follows: the working gas in the closed cycle gas path is heated by relying on the external heat carrier, the heated gas is used to drive the SCO2 turbine in the closed power cycle gas path, and the SCO2 turbine drives the high-speed starting / generating motor to operate. The application can meet the demand of large peak power pulse power supply required by airborne laser equipment, the system state is not affected by the flight height and the environmental air pressure, and the output power has the advantage of small attenuation with the change of the flight height of the aircraft.

This invention proposes a power cycle suppression method and system for HMCVT, belonging to the field of transmission design technology. It includes: maintaining normal operating mode and monitoring cycle energy changes in real time when no power cycle occurs; when the cycle energy exceeds a trigger threshold, power cycle suppression is achieved through a three-level control system comprising a soft processing mode, a bypass diversion mode, and a pure mechanical mode; the three levels of modes are executed sequentially and independently, with the next level mode activated only when the current mode fails. This invention can identify power cycles in real time and actively regulate and utilize cycle energy through a combination of structure and control, significantly improving the power cycle suppression effect for HMCVT.

According to the power station oil cooling system and method adopting the lubricating oil and organic working medium mixture, the lubricating oil cooling system and the organic working medium low-temperature power circulating system are creatively integrated, and direct mixing and efficient separation of the two working media are achieved through the oil mixer and the oil separator; a traditional dividing wall type heat exchanger is replaced, the investment cost of heat exchange equipment is greatly reduced, low-temperature waste heat carried by lubricating oil is fully utilized, low-temperature power cycle power generation is driven, the lubricating oil cooling task is effectively completed, meanwhile, the low-temperature waste heat which is originally difficult to use is converted into electric energy, and energy is saved. The comprehensive improvement of the heat efficiency of the system and the cascade efficient utilization of energy are realized.

The invention provides a power cycle-based life prediction method for a SiCMOSFET, and relates to the technical field of power electronic devices, and the method comprises the steps: obtaining the use data of the power cycle of the SiCMOSFET according to the experiments at different temperatures, forming a feature set, carrying out the training in a random forest regression model, obtaining a life prediction model, training the model through the features as few as possible, and carrying out the prediction of the life of the SiCMOSFET. The influence of the black box effect is reduced, the workload is reduced, two simulated environment temperatures are selected according to the actual environment temperature, the actual cycle index and the conduction voltage drop are combined to be input into the life prediction model to obtain the main residual life and the auxiliary residual life, actually generated data are converted into data under the experiment condition, and a prediction result is obtained; prediction is carried out in a standard data form during training so as to increase the prediction precision of the life prediction model, the final life is obtained according to the offset between the actual environment temperature and the simulated environment temperature, and accurate prediction of the residual life under the condition of considering the temperature is achieved.

The application discloses a kind of helium cooling inner channel air multi-modal combined power cycle system and method, system can carry out the conversion of 4 kinds of working modes by adjustable geometry, especially in turbine ram switching mode, helium is as closed quasi-brayton cycle working substance, by cooling and heating to the air of inner channel air compressor front air, significantly reduce the power consumption of turbine mode compressor, improve the thrust of mode conversion process;At the same time, helium is as intermediate medium and transmits the heat of inner channel air to outer channel air, improves the thrust of outer channel air.The turbine ram combined engine of the present application compared with the conventional jet precooling improves the thrust of mode conversion process, will not affect the oxygen content of compressor inlet flow, the total pressure loss of flow is small, can improve the pressure ratio of compressor under turbine ram switching mode, improve the working environment of engine, solve the "thrust gap" problem when working mode switches, realize the working requirement of wide speed range.

This invention discloses a power flow calculation method for series hybrid drive tracked vehicles, belonging to the field of hybrid vehicle control technology. This invention is the first to specifically model the configuration of a series tracked vehicle consisting of an engine, generator, high-voltage bus, and dual independent motors, capable of characterizing its unique electrical coupling and power distribution relationships. Starting from physical formulas, it constructs straight-line driving and steering condition models, integrating key factors unique to tracked vehicles such as slip loss, internal friction, and steering power cycle, making power demand prediction more realistic. The model architecture is modular and the parameters are open, allowing for vehicle-level power flow analysis and energy management strategy development, as well as for matching design and performance evaluation of transmission system components. This provides a foundational tool for subsequent design and verification of energy management algorithms with multiple objectives, including improving fuel economy, driving range, and system thermal safety.