231 results about "Power cycle" patented technology

The invention relates to the technical field of semiconductor device testing, in particular to a SiC MOSFET power cycle testing method which comprises the following steps: S1, building a composite environment testing platform, configuring dynamic testing parameters, automatically calculating a physical boundary and collecting sensor data in real time; s2, establishing a finite element simulation model based on the physical boundary and sensor data, and outputting optimized dynamic test parameters and a simulated stress distribution diagram; s3, synchronously applying composite stress according to the dynamic test parameters and the stress distribution diagram, and collecting multi-dimensional test data in real time; when the system is used, through dynamic boundary calculation and real-time data acquisition, the intelligent degree and reliability of the test are improved, the test period is shortened, the failure prediction accuracy is improved, the system is suitable for reliability evaluation of SiC MOSFET devices in the fields of new energy, aerospace and the like, a large number of physical tests are avoided through virtual simulation, and the reliability of the SiC MOSFET devices is improved. And reduction of device loss and resource waste is facilitated.

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.

Provided are a detection method, a control device, a power distribution box, and a storage medium. The detection method applied in a power distribution box includes: obtaining a real-time input alternating-current voltage and a zero-point alternating-current phase of the power distribution box within a utility power cycle; obtaining a simulated input alternating-current voltage of the power distribution box within the utility power cycle based on the zero-point alternating-current phase; determining that the real-time input alternating-current voltage is normal in response to an alternating-current voltage difference between the simulated input alternating-current voltage and the real-time input alternating-current voltage being smaller than or equal to a predetermined threshold, or determining that the real-time input alternating-current voltage is abnormal in response to the alternating-current voltage difference between the simulated input alternating-current voltage and the real-time input alternating-current voltage being greater than the predetermined threshold.

The invention discloses a GaN device power cycle failure prediction method based on a long short-term memory network, and the method comprises the steps: firstly collecting a power cycle dynamic parameter of a GaN device, then carrying out the preprocessing of the power cycle dynamic parameter of the GaN device, obtaining the preprocessing data, constructing a multi-dimensional time sequence input feature tensor according to the preprocessing data, and carrying out the prediction of the power cycle failure of the GaN device. The method comprises the following steps of: inputting a multi-dimensional time sequence input feature tensor into a GaN device, optimizing a long-short-term memory network to obtain a power cycle failure prediction model, inputting the multi-dimensional time sequence input feature tensor into the power cycle failure prediction model, performing power cycle failure prediction on the GaN device, and adaptively updating the power cycle failure prediction model. According to the method, the power cycle test of the GaN device can be terminated in advance through failure prediction, the data requirement of the target working condition is reduced, and the overall test time is shortened.

The invention belongs to the technical field of comprehensive energy utilization, and relates to a multi-energy cogeneration carbon dioxide power cycle system and a method thereof. The multi-energy cogeneration carbon dioxide power cycle system comprises a gas storage bin, a first compressor, a first cooler, a liquid storage tank, a first turbine, a rear preheater, a hot water supply unit, a waste heat recovery unit and a cold energy recovery unit. The hot water supply unit supplies hot water to absorb heat generated by multi-stage compression of carbon dioxide to obtain steam, so that the steam is supplied to a user, and the waste heat recovery unit and the hot water supply unit are matched to absorb and store the waste heat of the system to heat the carbon dioxide after expansion acting. And then the cold energy recovery unit is used for recovering the cold energy in the carbon dioxide subjected to expansion acting so as to supply cold water to a user or make ice, so that the waste heat and the cold energy in the power circulation process can be recovered, steam and the cold energy including electric energy are output, the energy consumption of the system is reduced, and the energy utilization efficiency of the system is also improved.

A method for heat integration between a chemical synthesis plant that runs an exothermic reaction and (ii) and a partner plant that generates a working fluid such as steam (e.g., runs a power cycle). The present disclosure describes both internal and external heat integration. Internal heat integration may provide heat from the exothermic reaction (e.g., from methanol synthesis) to a reboiler associated with a distillation column of the chemical synthesis plant. External heat integration may use heat from the exothermic reaction to preheat a condensed water stream (which stream is downstream from the turbine and condenser of the power cycle). Such reduces the need for bleed off the turbine to preheat condensed water as part of the power cycle. A bleed off the turbine provides heat to the reboiler associated with the distillation column of the chemical synthesis plant. Heat integration provides overall improved energy use within both plants.

A method for detecting a partial discharge in electric power equipment is disclosed. Two or more narrowband signals corresponding to respective frequency bands of the partial discharge are obtained by two or more receivers, and a temporal coincidence of the two or more narrowband signals is detected, thereby indicating a possible presence of the partial discharge. Then a synchronous recurrence of the partial discharge over a plurality of power cycles is determined, thereby validating the possible presence of the partial discharge. A corresponding system is also provided.

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.

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 invention relates to the technical field of power cycle tests, in particular to a test method for automatically interspersing static characteristic tests in a power cycle test, which comprises the following steps of: 1, performing a power cycle test on a tested sample, and judging the aging degree; counting the cycle number of the power cycle test; 2, judging whether the cycle number of the power cycle test reaches a preset value N or not, if yes, pausing the power cycle test, waiting for state recovery, and executing the step 3; if not, continuing to execute the step 1; 3, stopping the power cycle test, and entering a static parameter test; 4, all interspersed static parameter tests are finished, a power cycle test is recovered, and an interspersed transient thermal test is carried out; 5, judging whether a stop condition is triggered or not, and if yes, executing the step 6; if not, executing the step 1; and step 6, ending the loop test. Static parameter testing can be interspersed in power cycle testing, and the overall reliability of the tested sample is improved.

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.

The invention relates to the technical field of power semiconductor devices, and discloses a power cycle test circuit and method for a SiC power semiconductor device, and the circuit is characterized in that the AC side of a rectification circuit is connected with an AC power supply, and the DC side of the rectification circuit is connected with the first end of a DC boost circuit; the second end of the direct-current booster circuit is connected with the direct-current side of the inverter circuit; the alternating-current side of the inverter circuit is connected with an alternating-current power supply; part of power semiconductor devices in the rectifying circuit, the direct-current booster circuit and the inverter circuit are SiC power semiconductor devices to be tested. The active power cycle test circuit comprises a rectification circuit, a direct current boost circuit and an inversion circuit which are connected in series. The AC power supply provides energy for the test circuit. No load exists in the test loop, a power circulation loop is formed, and a circuit is provided for characteristic test of the SiC power semiconductor device. In the working process of the circuit, the power supply loop only needs to provide loss energy of the test loop.

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.

The invention provides a SiC MOSFET DC power cycle accelerated life test system and method. The system comprises a DC power supply, a main power circuit, a conduction voltage drop measurement circuit and a controller. The main power circuit comprises N device sub-circuits which are connected in parallel, and each device sub-circuit is provided with a SiC MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor); the conduction voltage drop measuring circuit comprises N measuring sub-circuits which are respectively connected with the SiCMOSFETs of the N device sub-circuits; the measurement sub-circuit is used for measuring the conduction voltage drop of the SiC MOSFET when the connected device sub-circuit is switched on and the body diode voltage drop of the SiC MOSFET when the connected device sub-circuit is switched off in a preset cycle period; the controller is used for controlling the N device sub-circuits to be sequentially switched on within the power-on time, and only one device sub-circuit is switched on; and obtaining the body diode voltage drop sequence of the SiC MOSFET in the preset cycle period collected by each measurement sub-circuit, thereby determining the junction temperature sequence of the SiC MOSFET of each device sub-circuit. According to the invention, accelerated life tests of SiC MOSFETs under a plurality of different working conditions can be realized at the same time, and the test efficiency is 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.

The invention discloses a composite working medium condensation and separation device for a semi-closed S-CO2 power cycle system, relates to the technical field of composite working medium condensation and separation, and solves the problem of separation of gaseous water in a CO2 working medium. The device comprises a composite working medium inlet drain pipe box, a circulating water shell and a working medium outlet pipe box which are vertically arranged and sequentially connected, wherein a spiral heat exchange pipe bundle is arranged in the circulating water shell; the composite working medium inlet drain pipe box, the spiral heat exchange pipe bundle and the working medium outlet pipe box are sequentially communicated; the composite working medium inlet drain pipe box is provided with a composite working medium inlet connecting pipe and a drain outlet connecting pipe; a water supply inlet connecting pipe and a water supply outlet connecting pipe are arranged on the circulating water shell; a working medium outlet connecting pipe and a starting exhaust port connecting pipe are arranged on the working medium outlet pipe box, and a wire mesh demister is arranged in the working medium outlet pipe box. According to the invention, through the coiled tube type heat exchanger, circulating water is adopted as a cold source to cool and condense the composite working medium, and based on the condensation temperature difference of CO2 and H2O, efficient separation of two components of CO2 and H2O is completed.

The invention provides an air conditioner which comprises an alternating current input circuit used for outputting a power supply signal; the photoelectric coupling circuit is used for transmitting or isolating a power supply signal; the zero-cross detection circuit is used for receiving the power source signal and the preset power source signal and determining a plurality of corrected zero-cross signals according to the power source signal and the preset power source signal, errors of original zero-cross signals can be made up, the accurate zero-cross detection function of the zero-cross detection circuit is achieved, more accurate zero-cross reference is provided for the air conditioner, and the air conditioner is more accurate in zero-cross detection. It is ensured that follow-up control over loads such as a fan of the air conditioner is highly synchronous with the power cycle, and the control precision and the equipment operation stability are improved.

A nested pebble bed blanket surrounding a fusion reactor's vacuum chamber includes stacks of nested pebbles composed of neutron multiplier shells filled with breeding spheroids. The shells have perforations passing through their inner and outer surfaces, and they include coolant distributor elements coupled or unitary with the inner surfaces that facilitates the coolant flow into the sphere, sweeping and cooling the inner breeding spheroids and the blanket as a whole. When bombarded by neutrons, the nested pebbles produce a fusion fuel to sustain fusion reactions and are replenished with conveyor systems. A separator extracts the fusion fuel from the blanket coolant, and the reactor's heat from the walls and nested pebble bed is extracted by inert gases and conveyed to a thermal storage and / or a power cycle

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 invention discloses a comprehensive energy system using double-fused-salt heat storage and supercritical carbon dioxide energy release, which comprises an S-CO2 Brayton power cycle subsystem and a double-fused-salt heat storage subsystem, the double-fused-salt heat storage subsystem is coupled with the S-CO2 Brayton power cycle subsystem, the system can solve the problem of single energy storage form, and the energy storage efficiency is improved. The system has the characteristics of high operability, high peak regulation capability and high energy storage and release efficiency.

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.

The invention discloses a multi-working-condition low-loss acceleration power cycle testing device and a control method, and belongs to the technical field of power equipment testing. According to the invention, the inductance data of the inductance module, the power device voltage data output by the to-be-tested power device module and the load voltage data output by the load converter module are interacted, and different power device working conditions are combined; on-off control signals of the to-be-tested power device module and on-off control signals of the load converter module can be dynamically generated, so that acceleration power cycle testing under multiple working conditions is realized; through the connection of the load converter module, the to-be-tested power device module and the interactive inductor module, the energy in the acceleration power cycle test process is cyclically exchanged between the load converter module and the to-be-tested power device module, so that the energy loss of the acceleration power cycle test is reduced.

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.

A method, computer system, and a computer program product are provided for operating a primary and a backup RAID storage array. A disk drive configuration is loaded into a disk controller in a primary RAID array and a disk controller in a backup RAID array. The disk drive configuration includes a schedule for a sequence of selectively power cycling the disk drives, which is executed by the disk controller in the primary and in the backup RAID arrays. Upon detecting a disk failure, each disk controller executes a recovery procedure according to instructions included in the disk drive configuration. Recovery procedure includes suspending power cycling all disk drives and powering on all intentionally powered off disk drives. Data is copied from the corresponding backup RAID array disk drive to primary RAID array to rebuild the failed drive. The RAID configuration remains in this state until failed disk drive is repaired.