10 results about "Critical power" patented technology

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 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.

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.

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 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.

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 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.