27 results about "Critical power" patented technology

The invention discloses a fuel rod burnout share analysis method and device and a consequence evaluation method and system under a shaft jamming accident, and the method comprises the steps: simulating a transient process of the shaft jamming accident of a nuclear power plant, and determining a transient working condition parameter corresponding to a time point of a minimum transient DNBR under the shaft jamming accident; under the condition that the minimum transient DNBR is smaller than a safety limit value, determining an initial thermal hydraulic state of a reactor core of the nuclear power plant according to the transient working condition parameters; according to the initial thermal hydraulic state and a pre-established reactor core channel model, adjusting a radial power factor of a hottest sub-channel of the sub-channel model, and determining a critical power peak factor; and according to the critical power peak factor, determining the burnout share of the fuel rod with DNB in the nuclear power plant shaft jamming accident from a fuel statistical curve. Therefore, the accuracy of analyzing the burnout share of the fuel rod under the shaft clamping accident can be improved.

The invention discloses a parameter self-adaption-based droop control method and system. The method comprises the steps of obtaining a first critical voltage value and a second critical voltage value of a grid-connected system in a critical stable state; the system power angle corresponding to the first critical voltage value is a critical power angle; the system power angle corresponding to the second critical voltage value is a rated power angle, and the reactive power droop coefficient of the droop converter is the minimum reactive power droop coefficient under normal operation; when the power grid voltage is smaller than the first critical voltage value and not smaller than the second critical voltage value, the reactive droop coefficient is adjusted in a self-adaptive mode with the purpose that the system power angle reaches the rated power angle; and when the voltage of the power grid is smaller than a second critical voltage value, adaptively adjusting the reactive power reference value by taking the system power angle reaching the rated power angle as a target, and constraining the active power reference value according to the capacity of the droop converter. By adopting the embodiment of the invention, the system can be ensured to stably operate at a balance point for a long time, and the grid-connected capacity in the transient process of the system is ensured at the same time.

The invention discloses a new energy tracking / networking converter capacity configuration method based on a power angle stability boundary, and the method comprises the steps: firstly, building a new energy sending end system simulation model containing a networking converter, and calculating a steady-state operation point of a system; then, carrying out dynamic equivalence on the network construction type converter and a synchronous generator to obtain equivalent machine parameters, and simplifying an original simulation system into an equivalent machine and a network following type new energy sending end system; deriving mechanical power and electromagnetic power of the equivalent machine before, during and after the fault to obtain a power angle characteristic curve of the equivalent machine; calculating the acceleration area and the maximum deceleration area of an equivalent machine under different proportions of the network construction type converter, and obtaining the proportion of the network construction type new energy under the stable critical power angle of the system by adopting a dichotomy method; simulation is carried out based on a PSASP platform, and the rationality of the proposed configuration principle is verified. According to the scheme provided by the invention, the network construction investment of the system can be reduced while the safety and stability of the system are ensured, and the admitting ability of the power grid to new energy is improved.

The invention provides a control method of a dual-active bridge converter, and relates to the technical field of power electronics, the method comprises the following steps: firstly collecting output electrical parameters to calculate real-time power, and determining critical power according to a voltage transmission ratio; comparing the real-time power with the critical power, and carrying out segmented optimization control: when the real-time power is not greater than the critical power, solving a phase shift by adopting minimum backflow power optimization control; when the real-time power is greater than the critical power, adopting backflow power and current stress collaborative optimization control, constructing an objective function through weighted summation, and introducing a momentum method to carry out iterative optimization so as to solve an optimal phase shift ratio; and finally, according to the solved phase shift ratio, generating a PWM driving signal to control a switch tube. According to the invention, through a segmented optimization strategy, the backflow power and the current stress are effectively reduced in a wide working condition range, so that the transmission efficiency and the reliability of the converter are improved.

The invention discloses a cross-third-order bending critical power turbine rotor test device and method, and belongs to the technical field of aero-engines, the cross-third-order bending critical power turbine rotor test device comprises a supporting mechanism used for supporting a simulation rotor, a power mechanism, a control system used for controlling the power mechanism, a lubricating oil mechanism and a test system, the power turbine first-stage wheel disc and the power turbine second-stage wheel disc are used for being connected with a rotor shaft, are in wheel disc shapes and are connected with each other, the bearing mechanism comprises a test platform, a front support, a rear support and a vacuum box, the vacuum box is arranged on the test platform, and the vacuum mechanism is connected with the vacuum box. The vacuum mechanism is used for vacuumizing the vacuum box, the front support and the rear support are arranged on the test platform in a spaced mode and located in the vacuum box, the front support and the rear support are used for clamping and supporting a rotor shaft, and the rotor shaft is connected with the power mechanism. The simulation rotor replaces a real rotor to carry out the test, the processing period is greatly shortened, the test cost is reduced, and the test risk is reduced.

The application discloses a new energy follow / network converter capacity configuration method based on a power angle stability boundary, first, a new energy sending end system simulation model containing a network type converter is established, and a steady state operating point of the system is calculated; then, the network type converter is dynamically equivalent to a synchronous generator, equivalent machine parameters are obtained, and the original simulation system is simplified into an equivalent machine and a new energy sending end system of a follow network type; mechanical power and electromagnetic power of the equivalent machine before, during and after a fault are derived, and an equivalent machine power angle characteristic curve is obtained; acceleration area and maximum deceleration area of the equivalent machine under different network type converter proportions are calculated, and a proportion of the network type new energy under a critical power angle stability of the system is obtained by using a dichotomy; simulation is carried out based on a PSASP platform, and rationality of the proposed configuration principle is verified. The scheme can reduce network investment of the system while guaranteeing safety and stability of the system, and improve the power grid's accommodation capacity for new energy.

The present invention provides a method and system for correcting the critical power and inlet temperature of a CHF test of a fuel assembly, comprising: obtaining test data in an original data table; confirming the qualitative temperature of a nickel rod based on the test data; obtaining the resistivity ρ based on the qualitative temperature; obtaining the resistance value R based on the resistivity ρ; obtaining the test critical power P based on the test data and the resistance value R jg , make corrections; based on the test data and test power, the enthalpy rise Δh of the nickel rod is obtained; based on the test data, the enthalpy value h of the nickel rod is calculated in ; According to the enthalpy rise Δh and enthalpy value h in , calculate the inlet enthalpy value h of the heating section of the nickel rod jg ; Based on the inlet enthalpy value h of the heating section of the nickel rod jg The inlet temperature T of the heating section of the nickel rod is calculated based on the experimental data. jg The present invention obtains more accurate CHF test results and data analysis through inlet temperature correction and power correction to improve the reliability and comparability of the test.

The invention relates to the technical field of digital twinning, and discloses a 3D chip design simulation modeling method and system based on the twinning technology, and the method comprises the steps: obtaining physical field simulation data, carrying out the feature fusion of thermal stress and thermoelectric coupling through solving a thermal expansion vector field, and obtaining a preliminary mapping relation; according to the preliminary mapping relation, nonlinear cumulative effect calculation of the dynamic power consumption density is carried out, and a final cumulative effect value is obtained; according to the final cumulative effect value, adjusting an interconnection material, and correcting an index set; according to the correction index set, deviation quantitative calculation is carried out through heat flow evolution path analysis, and a thermal resistance degradation deviation matrix is obtained; according to the thermal resistance degradation deviation matrix, Pareto front inflection point extraction is carried out, and balance configuration is obtained; according to the balance configuration, non-dominated declusters meeting a preset critical power consumption threshold value are screened out, and candidate declusters are obtained; and according to the candidate declusters, screening out the optimal configuration, and outputting a final optimization scheme. The method can reduce the abrupt change risk of the chip degradation rate.

The present invention discloses a temperature-based power supply method for a battery energy storage system, the method comprising the following steps: S1. For each battery pack in the energy storage system, multiple discrete power points are determined, and the critical power that causes the battery pack temperature to rise rapidly is tested; S2. For each battery pack in the energy storage system, it is made to work at the critical power, and the maximum working time of the battery pack at the critical power is measured as the maximum working time of the battery pack; S3. Based on the external power supply demand of the energy storage system, the critical power of each battery pack in the energy storage system, and the maximum working time of each battery pack in the energy storage system, the power supply strategy of the energy storage system is designed. The present invention can ensure that when the battery energy storage system is supplying power to the outside, the temperature of the battery pack in the energy storage system will not be higher than the maximum allowable temperature, thereby avoiding damage to the battery pack and effectively ensuring the safety of the battery energy storage system.

The invention discloses a power supply combination power supply method for avionics equipment, which comprises the following steps of: S1, setting that a power supply of the avionics equipment comprises a plurality of power supply units, and testing the working critical power of each power supply unit; s2, giving a working environment temperature range of a power supply of the avionics equipment, and dividing the environment temperature range into different discrete temperatures; s3, configuring the output power of each power supply unit at any discrete temperature, testing the difference value between the actual output power of each power supply unit and the configured output power, and then sorting; s4, obtaining a difference value sequence of the actual output power and the configured output power of each power supply unit at each discrete temperature; and S5, formulating a power supply combination power supply scheme of the avionics equipment. According to the invention, the priorities of the power supply units at different temperatures can be determined according to the difference between the configured output power and the actual output power, so that the power supply units with higher priorities are selected for combined power supply during power supply, and the power supply stability is improved.

This invention relates to the field of laser processing technology, specifically to a time-series ultrafast laser lift-off method and system for silicon carbide wafers. The method includes selecting a silicon carbide single-crystal wafer and fixing it at the processing position; emitting an ultrafast laser pulse with a preset total energy and pulse width; dividing the ultrafast laser pulse into at least eight sub-pulses in the time domain to form a sub-pulse sequence; adjusting the energy of the sub-pulse sequence until the peak power of each sub-pulse is lower than the self-focusing critical power threshold of the silicon carbide single-crystal wafer under single-pulse action; focusing the energy-adjusted sub-pulse sequence onto the interior of the wafer to form a single-layer modified region; controlling the movement of the focused spot to expand into a continuous modified lift-off layer; and applying stress along the lift-off layer to separate the wafer into the peeled wafer and the remaining wafer. This invention can suppress vertical deep damage caused by self-focusing, achieve extremely low material loss, and realize rapid, easy, and high-quality wafer separation.

A system includes a turbine configured to exhaust an air stream. The system also includes a first coil configured to transfer thermal energy to the air stream when the air stream passes by or through the first coil, wherein the first coil is downstream of the turbine. The system also includes a second coil configured to transfer thermal energy to the air stream when the air stream passes by or through the second coil, wherein the second coil is downstream of the first coil. The system also includes a third coil configured to transfer thermal energy to the air stream when the air stream passes by or through the third coil, wherein the third coil is downstream of the second coil. The air stream is configured to cool one or more electronic components of a data center that is downstream of the third coil.

The invention discloses a fuel rod PCI critical power determination method and device and computer equipment. The method comprises the following steps: acquiring expected power of a fuel rod in a nuclear reactor core in each operation stage in a life cycle; determining target power and target burnup of the fuel rod in a stable state according to the expected power; and performing transient change on the target power according to a limiting condition corresponding to the cladding type of the fuel rod, and determining the PCI critical power of the fuel rod under the target power and the target burnup operation. The PCI critical powers of different fuel rods under different operation powers and burnups are determined, the reliability and comprehensiveness of PCI performance analysis of the fuel rods are improved, actual operation of the fuel rods can be adjusted and controlled, and PCI performance failure of the fuel rods is avoided.

The invention provides a power grid operation mode division and power balance method considering multiple types of states and a related device, and aims to solve the problems of complex structure, heavy load of a transformer, unbalanced load and the like in the operation of an AC / DC micro-grid group system. The method comprises the following steps: acquiring state parameters such as transformer heavy load, system critical power PC, storage battery SOC and the like; dividing five main modes and sub-modes based on fault types and state parameters; the VSC power is regulated and controlled through a load balancing strategy, so that the load rates of the transformers are equal to reduce the loss; mode switching is completed within 100 ms, and it is ensured that the load rate fluctuation is smaller than or equal to 5%. The device correspondingly comprises a state parameter acquisition module, a mode division module, a power regulation and control module and a switching module. According to the method, multi-dimensional dynamic regulation and control are realized, the system stability, economy and fault response speed are improved, and the method is suitable for an intelligent power distribution scene with high-proportion renewable energy access.

This invention belongs to the field of distributed power supply control technology, specifically involving a method for rapid coordinated control of small power supply switching, an edge computing terminal, and a storage medium. When a power grid fault occurs, the loss-of-power area is located, and the real-time load power gap caused by the power grid fault within that area is calculated. Based on the switching capacity of all controllable small power supplies to be switched and the real-time load power gap being met, the optimal set of controllable small power supplies to be switched is obtained with the objective of minimizing the weighted sum of the deviation term and the cost term. The deviation term is the absolute value of the difference between the switching capacity and the real-time load power gap, and the cost term is the total switching cost of all controllable small power supplies to be switched, determined according to the switching priority. This invention can prioritize the switching of less important (lower cost) small power supplies while satisfying power balance, maximizing the continued grid connection of critical power supplies, effectively avoiding over-switching while reducing power outage losses.

This application provides a method and system for integrating SARIMAX prediction and shipyard critical power facility scheduling optimization, relating to the field of power facility load prediction technology. The method includes: preprocessing initial data; performing stationarity and white noise tests on the preprocessed data to obtain final data; selecting the optimal variables that meet the optimal model criteria based on the final data to determine the optimal SARIMAX hyperparameters; training the SARIMAX prediction model parameters using seasonal and non-seasonal orders and exogenous variables, and performing fitting processing; predicting gas load usage based on the SARIMAX prediction model corresponding to historical multi-condition data types; verifying the limited spatial range of gas load usage against the predicted gas usage; and optimizing the scheduling of shipyard critical power facilities based on the verified SARIMAX prediction model. This application can improve the effective operating rate of air compressor units in shipyard critical power facilities, reduce overall energy consumption, and achieve data-driven refined energy management in shipyards.

The invention relates to a method for separating a first substrate layer (1) along at least one separation line, said method comprising:-providing a first substrate layer (1); and separating the first substrate layer (1) along a separation line generated by irradiating the first substrate layer (1) by means of the laser light (2), characterized in that, in order to form the separation line, the power of the laser light (2) is set such that the power of the laser light (2) has a value higher than a critical power value for forming a self-focusing of the laser light (2) in the first substrate layer (1).

The application discloses a kind of power management method and system based on micro downhole sensor, the method includes: using columnar piezoelectric structure to collect downhole mechanical energy and convert into electric energy storage;Real-time monitoring energy storage state and calculating current available energy;According to available energy, it is switched between normal work, light sleep and deep sleep mode;In sleep mode, low-frequency intermittent sampling is monitored in environment, only when wake-up event is detected and current available energy meets task demand, wake-up is triggered.The application significantly improves the energy efficiency and structural reliability of columnar piezoelectric structure under high pressure in deep well;Adopt hierarchical sleep and hysteresis determination mechanism, effectively avoid system oscillation under critical power;Combined with multi-modal fusion and pre-wake-up energy prediction mechanism, system deadlock caused by invalid wake-up is eliminated, and long-term autonomous stable operation of micro sensor under complex working conditions in well is realized.

The invention discloses a wide-spot tin bronze laser cladding method, and belongs to the technical field of laser remanufacturing. The method comprises the following steps: physically dehumidifying tin bronze powder; the minimum critical preheating temperature of the base material is determined based on the dynamic relation between the molten pool solidification life and the bubble escape time; configuring a rectangular flat-top wide light spot, and calculating a critical power density upper limit based on a tin element saturated vapor pressure model; and performing laser cladding under the condition that the actual power density is controlled to be maintained in a preset safety range. According to the method, the multi-physics field coupling model and the wide light spot technology are combined, the temperature gradient is reduced through the flat-topped light beams, the machining efficiency is remarkably improved, meanwhile, tin element burning loss is effectively restrained, the number and size of air holes in the coating are reduced, and preparation of the tin bronze coating with the low dilution rate and the high quality is achieved.

A method includes receiving temperature measurements from multiple temperature sensors in a power supply system that includes multiple coils arranged in a series downstream of a turbine, each coil configured to receive thermal energy from an air stream exhausted from the turbine as the air stream moves toward a data center, each coil associated with at least one fluid loop. The method also includes using a first subset of the temperature measurements to determine a blended fluid mix from a primary fluid path and a heated fluid reservoir in order to obtain a predetermined leaving fluid temperature at a first coil of the multiple coils. The method further includes controlling a position of one or more valves associated with the primary fluid path and the heated fluid reservoir to achieve the determined blended fluid mix.

The application relates to the technical field of digital twinning, and discloses a 3D chip design simulation modeling method and system based on twinning technology, which comprises the following steps: acquiring physical field simulation data, performing feature fusion of thermal stress and thermal-electric coupling by solving a thermal expansion vector field to obtain a preliminary mapping relationship; performing nonlinear cumulative effect calculation of dynamic power density according to the preliminary mapping relationship to obtain a final cumulative effect value; adjusting interconnection materials according to the final cumulative effect value to correct an index set; performing deviation quantitative calculation through thermal flow evolution path analysis according to the index set to obtain a thermal resistance degradation deviation matrix; performing Pareto frontier inflection point extraction according to the thermal resistance degradation deviation matrix to obtain a balanced configuration; screening a non-dominated solution cluster that meets a preset critical power threshold according to the balanced configuration to obtain a candidate solution cluster; screening an optimal configuration according to the candidate solution cluster to output a final optimization scheme. The method can reduce the risk of chip degradation rate mutation.

The present invention discloses an optimal single-sided asymmetric three-degree-of-freedom phase-shift modulation method for a dual-active bridge, which relates to the field of dual-active bridge modulation and includes the following steps: when the current normalized power is greater than 0 and less than the current voltage conversion ratio, it is determined whether the current normalized power is greater than the normalized critical power point. If so, enter the heavy-load mode and obtain the optimal phase-shift solution in the heavy-load mode; otherwise, enter the light-load mode to obtain the optimal phase-shift solution in the light-load mode; drive the switching tubes of the dual-active bridge according to the obtained optimal phase-shift solution to complete the optimal single-sided asymmetric three-degree-of-freedom phase-shift modulation of the dual-active bridge. This method minimizes the peak-to-peak value of the inductor current within the full power range, while increasing the number and range of soft switches. The modulation method of the present invention takes into account the optimization of the switching loss and conduction loss of the dual-active bridge converter, so that the efficiency of the dual-active bridge converter is improved within the full power range.

The application discloses a fuel rod PCI critical power determination method, device and computer equipment. The method comprises the following steps: obtaining expected power of fuel rods in each operation stage in a life cycle in a nuclear reactor core; determining target power and target burnup of the fuel rods in a steady state according to the expected power; and determining PCI critical power of the fuel rods in the target power and target burnup operation state by performing transient change on the target power according to a restriction condition corresponding to a cladding type of the fuel rods. The application determines the PCI critical power of different fuel rods under different operation power and burnup, improves the reliability and comprehensiveness of the PCI performance analysis of the fuel rods, is beneficial to adjusting and controlling the actual operation of the fuel rods, and avoids PCI performance failure of the fuel rods.

A droop control method and system based on parameter adaptation disclosed by the present invention obtain a first critical voltage value and a second critical voltage value when the grid-connected system is in a critically stable state; the system power angle corresponding to the first critical voltage value is the critical power angle; the system power angle corresponding to the second critical voltage value is the rated power angle, and the reactive droop coefficient of the droop converter is the minimum reactive droop coefficient under normal operation; when the grid voltage is less than the first critical voltage value and not less than the second critical voltage value, the reactive droop coefficient is adaptively adjusted with the goal of the system power angle reaching the rated power angle; when the grid voltage is less than the second critical voltage value, the reactive power reference value is adaptively adjusted with the goal of the system power angle reaching the rated power angle, and at the same time, the active power reference value is constrained according to the capacity of the droop converter. By adopting the embodiment of the present invention, it is possible to ensure that the system operates stably at the equilibrium point for a long time, and at the same time, the grid connection capacity during the transient process of the system is ensured.

The invention relates to the technical field of energy management, and discloses an online interactive uninterruptible power supply state switching method and equipment thereof, and the method comprises the following steps: step S01, constructing uninterruptible power supply dual-mode switching constraint conditions, step S02, analyzing the electric energy storage state of dual-mode switching, quantifying the complexity of dual-mode switching, and determining the state of the uninterruptible power supply. S03, generating a disturbance parameter combination through Gaussian distribution disturbance, S04, carrying out multi-scene state switching simulation evaluation and collecting key indexes, and S05, constructing a three-dimensional effect display model, determining a final switching parameter array, and solidifying the final switching parameter array to a UPS control strategy. According to the online interactive uninterruptible power supply state switching method and device, the state switching performance of the online interactive uninterruptible power supply is remarkably improved, meanwhile, the intelligent level and the adaptive capacity are enhanced, intelligent upgrading of UPS switching control is achieved, and a brand new technical solution is provided for key electric power guarantee.

The invention relates to a power distribution network for an electrically powered aircraft, comprising: at least one power source; at least one critical power user; at least one non-critical power user; a busbar arrangement comprising a plurality of busbars, wherein each busbar is connected to at least one of the at least one power source, at least one of the at least one critical power user and at least one of the at least one non-critical power user; a controller arrangement arranged to: control power delivery from the at least one power source via the busbar arrangement, detect an operational fault condition; detect critical power usage; and detect non-critical power usage; wherein the busbar arrangement is arranged to provide each busbar with a different connection route to the at least one critical power user and the at least one non-critical power user.

The application provides a method and device for determining the fastest pumping displacement, a pumping device and an engineering vehicle. The method comprises the following steps: obtaining multiple pumping data based on current working condition data of the pumping device and multiple preset pumping displacements; inputting the multiple pumping data into a pre-trained critical power prediction model to obtain a prediction result output by the critical power prediction model, wherein the prediction result comprises whether the critical power value is reached or not reached when the pumping device operates according to the pumping data; and determining the fastest pumping displacement under the current working condition data based on the multiple pumping data and the corresponding prediction result. According to the technical scheme, the fastest pumping displacement can be determined according to the prediction result of the critical power prediction model, and when the pumping device operates according to the fastest pumping displacement, the running power of the pumping device can be prevented from exceeding the critical power value while the pumping displacement is improved, the pumping efficiency is effectively improved, and the fuel consumption is reduced.