25 results about "Transient analysis" patented technology

The application provides an electromigration reliability non-uniform discrete equivalent circuit modeling method and system, adopts an equivalent circuit-based method to analyze electromigration stress evolution of a general complex interconnection structure, fully considers a thermal field effect in a model, realizes stress analysis equivalent circuit modeling under multi-physical field coupling, and solves the problem of waste of computing resources in processing large-span interconnection structures by using a traditional uniform discrete method, avoids unnecessary transient simulation on an immortal interconnection tree, reduces the computing load of full-chip-level analysis, and realizes efficient and high-precision transient analysis of electromigration reliability of a large-scale interconnection network under multi-physical field coupling effects.

This invention discloses a power grid risk early warning method based on digital twins, belonging to the field of power grid risk early warning technology. The method includes: firstly, integrating data from the power grid energy management system, production management system, and information security system to construct a digital twin base for the primary system physical model, the secondary system mechanism model, and associated operating modes; then, considering the virtual automatic voltage control constraint calculation baseline situation; subsequently, injecting hypothetical equipment faults, and linking the execution of electromechanical transient analysis, relay protection action prediction, standby automatic transfer action prediction, and power flow recalculation to form a predictive topology; further, combining power source backtracking and dynamic voltage difference calculation at both ends after virtual disconnection of tie switches, identifying single-source risks, risks from the same upstream power source, and risks of double circuits on the same pole. This method achieves unified extrapolation of power grid operating status, secondary device actions, and structural risks, improving the completeness, foresight, and targeted level of risk identification and response.

This invention discloses an efficient transient analysis method for electromagnetic-thermal-fluid multiphysics fields on integrated chips. Focusing on electromagnetic, thermal, and fluid fields as core research objects, and centering on typical scenarios of full electromagnetic-thermal-fluid coupling, it systematically integrates the governing equations, boundary conditions, and constitutive relations of each physical field to construct a unified set of coupled partial differential equations. Under the premise of verifying and satisfying the stability conditions of all physical field discretization schemes, simultaneous numerical solutions for the multiphysics fields are achieved through FDTD. This invention, through multi-faceted synergistic optimization, achieves comprehensive adaptation to complex structures, providing reliable technical support for solving various complex engineering multiphysics coupling problems.

This invention provides a non-uniform discrete equivalent circuit modeling method and system for electromigration reliability. It employs an equivalent circuit-based approach to analyze the electromigration stress evolution of general complex interconnect structures, fully considering thermal field effects in the model. This achieves equivalent circuit modeling for stress analysis under multi-physics coupling. Furthermore, by using an adaptive mesh method with non-uniform spatial discretization and a steady-state / quasi-steady-state filtering mechanism, it solves the problem of wasted computational resources in traditional uniform discretization methods when dealing with large-span interconnect structures, and avoids unnecessary transient simulations of immortal interconnect trees, reducing the computational load of full-chip-level analysis. This enables efficient and high-precision transient analysis of the electromigration reliability of large-scale interconnect networks under multi-physics coupling effects.

This invention discloses a method and system for transient analysis of helium leakage in a nuclear fusion device, relating to the field of nuclear fusion safety analysis technology. The method includes the following steps: obtaining the structural parameters and operating parameters of the Dewar radiator of the nuclear fusion device; dividing the internal space of the Dewar radiator into multiple interconnected control volumes based on the structural parameters; establishing a set of transient analysis equations containing target physical quantities for each control volume based on the operating parameters; solving the transient analysis equations using a variable step-size integration method to obtain the transient time histories of the target physical quantities in each control volume; and converting the transient time histories of the target physical quantities into load data files recognizable by the target engineering analysis platform. This method, by dividing the internal space of the Dewar radiator into control volumes and solving the helium leakage transient process based on the divided structures, can accurately predict the pressure and temperature evolution under leakage accidents and generate load files that can be directly used for structural safety assessment, thus improving the efficiency of safety analysis and design optimization capabilities.

This invention discloses a modeling and current limiting method for grid-type energy storage that considers the short-circuit impedance phase angle. Addressing the issue of existing transient analyses neglecting the short-circuit impedance phase angle, this method establishes a fault transient model under non-metallic short-circuit grounding scenarios, correcting the analysis error caused by traditional transient analyses that only consider voltage drops. Based on this, this invention constructs an adaptive virtual impedance based on voltage and current deviations and proposes a hybrid current limiting strategy for actual fault scenarios, combined with a ring current limiter. This improves the transient modeling theory of grid-type energy storage and provides a reference for enhancing overcurrent limiting capabilities under large disturbances. Hardware-in-the-loop simulation results show that this hybrid current limiting strategy can achieve effective current suppression throughout the entire fault process, laying a solid foundation for the safe operation of power electronic equipment.

This invention discloses a reinforcement learning simulation step size control method based on closed-loop adaptive noise injection and entropy increase optimization strategy, belonging to integrated circuit computer-aided design technology. Specifically, the method involves: first, inputting the circuit netlist and interacting with the simulator using file read / write; next, establishing two new network output layers to convert the deterministic actions of the policy network's output into a probability distribution; then, obtaining the entropy regularization term based on the probability density function and weight coefficients, and adding it to the policy loss function; next, generating Gaussian-distributed exploration noise and adjusting the standard deviation of the noise at each step using a PID controller; finally, adjusting the policy network parameters using a gradient update method and injecting the exploration noise into the output actions to obtain the final time step. Using this invention helps enhance the simulation stability of pseudo-transient analysis, improves simulation efficiency, and provides a new method for DC analysis.

This invention relates to the field of geological engineering, specifically to a method and system for quantitatively analyzing the diffusion effect of synergistic grouting in water-rich soft rock fracturing and seepage. The method includes: conducting parameter tests and obtaining time-varying characteristic parameters through orthogonal experiments; establishing a coupled dynamic model including the grout volumetric flow rate equation, seepage motion equation, and flow continuity equation to obtain the spatiotemporal distribution of the grout field, the flow distribution coefficient of the dual-domain coupling, and the grouting parameters at different grouting times; constructing an index system with synergistic effects and obtaining quantitative values ​​of the diffusion effect. This invention constructs a dual-domain coupled dynamic model that couples the grout volumetric flow rate equation, seepage motion equation, flow continuity equation, and stress continuity equation, modifies the classical flow law to adapt to the grout yield stress characteristics, and achieves transient analysis through finite element numerical solution. It can output the spatiotemporal distribution of the grout field, the flow distribution coefficient, and the grouting parameters, and determine the micro-zone division boundary threshold based on experimental data.

This invention belongs to the technical field of high-field magnet structure design, specifically involving an adaptive selection method for simulation type in pulse magnet structure design. The method includes: establishing a model of the pulse magnet; using a circuit model to calculate the actual current waveform of the magnet at the required power supply voltage; importing this waveform into an electromagnetic finite element model to calculate the peak electromagnetic load of the magnet; applying this load as a single step load to the structural finite element model; extracting the stress-time curve of each target component; and extracting the fundamental component of this curve using Fourier transform to determine the natural vibration frequency of the component. ω m Perform a Fourier transform on the actual current waveform to determine its fundamental component. ω i If all target components ω m All are greater than N × ω i If a steady-state simulation evaluation is selected, then this invention can solve the problem of the lack of a standardized operating system in the existing pulse magnet structure design that can reasonably use static analysis results to approximate transient analysis results.

The application discloses a pantograph-catenary arc electrical characteristic and transient overvoltage analysis method considering the influence of time-varying parameters, in which, in the transient analysis of pantograph-catenary off-line arc, time-varying impedance and capacitive impedance parameters of a traction network are introduced into the pantograph-catenary arc electrical characteristic formation process for the first time, and an improved arc model considering the influence of train speed and a fine train-track grounding system model are combined to realize the unified analysis of the overvoltage of a train roof and a train body, avoid the overvoltage evaluation deviation caused by the static traction network parameters and the simplified grounding model, and improve the accuracy and engineering applicability of the pantograph-catenary off-line arc transient overvoltage analysis.

The embodiment of the application discloses a dynamic phasor representation DC power system random transient analysis method, relates to the power electronic field of the DC power system, and can reflect system characteristics caused by source-load random excitation conditions and multi-rate simulation, and balance the contradiction between precision and efficiency. The application comprises the following steps: obtaining DC power system parameters and setting initial parameters; obtaining circuit models of two types of lumped elements in the DC power system; establishing a dynamic phasor model of a converter station in the DC power system and obtaining a dynamic companion circuit of the converter station; using the circuit models of the two types of lumped elements and the dynamic companion circuit of the converter station, establishing a model of the DC power system; obtaining node voltage equations of the DC power system; updating a node admittance matrix and an injected current vector according to changes in a switching function of the converter station; and converting dynamic phasors output by the model of the DC power system into instantaneous values.

The application belongs to the technical field of new energy grid-connected system transient analysis, and particularly relates to a kind of direct-drive wind power grid-connected system transient overvoltage analysis method under asymmetric fault, comprising: obtaining three-phase asymmetric voltage and current, constructing positive and negative sequence double-synchronous positive and negative sequence dq control model of direct-drive wind power station;Establish the mapping relationship with symmetric component method and determine the positive sequence dynamic reactive current increment and negative sequence current suppression coefficient according to the converter control strategy;Establish the sequence network boundary condition under a variety of asymmetric faults;Equivalent direct-drive wind power station to frequency-dependent controlled sequence impedance source, obtain the equivalent sequence impedance of wind farm;Establish the sequence network equation considering wind power dynamic support;Calculate the current and sequence voltage of fault point and obtain three-phase voltage through symmetric component inverse transformation;Calculate the overvoltage coefficient and establish the quantitative relationship between overvoltage coefficient and negative sequence current suppression coefficient and apply it.The application provides theoretical support for parameter setting and capacity planning of wind power grid-connected system.

This invention pertains to the field of power and discloses a method and apparatus for constructing an electromagnetic equivalent model of a wind farm. The method includes: selecting a target electromagnetic transient model for each segment of the collector line from a π-type lumped parameter line model and a distributed parameter line model, based on a preset electromagnetic transient simulation step size and the actual length of the collector lines between wind turbines within the wind farm; selecting a clustering strategy for the wind turbines according to the target frequency band of interest in the electromagnetic transient analysis; for scenarios requiring dynamic clustering, using a K-means clustering algorithm based on an improved bird flocking algorithm to cluster the wind turbines and determine the optimal cluster centers; and using a capacity-weighted algorithm to perform parameter equivalence calculations on the turbines within the same cluster based on the target electromagnetic transient model and the clustering results of the wind turbines, thereby completing the construction of the electromagnetic equivalent model of the wind farm.

The application discloses a kind of model prediction transient stability control methods of multi-organization network system under saturation constraint, belong to power system stability control technical field, including the following steps: considering the influence of current saturation limit, construct the transient analysis mathematical model of grid-forming two-machine parallel system before and after power grid fault;Saturation current phase control strategy is constructed based on transient analysis mathematical model;When saturation current phase control strategy cannot maintain the transient stability of grid-forming two-machine parallel system, the control strategy of active power reference value compensation amount is constructed;A kind of model predictive control strategy of combined saturation current phase control strategy and active power reference value compensation amount control strategy is proposed.The application adopts the model prediction transient stability control method of multi-organization network system under saturation constraint described above, it is favorable to meet the demand of the transient stability of grid-forming multi-machine parallel system.

The invention discloses a multi-channel wave recording system and method based on a network construction svg distributed architecture, and relates to the technical field of power systems, and the system comprises a network construction SVG valve layer system which comprises a plurality of valve layer units; the data acquisition system is used for acquiring protection data and control data of the valve layer unit and other primary equipment, sending the protection data to the protection system and sending the control data to the valve control system; the valve control system is used for performing valve control processing on the valve layer units based on the control data; the protection system is used for protecting the valve control equipment based on the protection data; and the wave recording system is used for recording and storing wave recording data from the valve control system and the protection system and generating a wave recording file. According to the technical scheme, the linkage wave recording capability and the accuracy degree of the wave recording data when the power system has the transient fault can be improved, and sufficient node data is provided for transient analysis of the power system.

This invention discloses a novel time-varying low-rank representation model for dynamic operation and maintenance of power systems and its application method. Based on a four-layer collaborative evolutionary computational architecture, it introduces low-rank adaptive Representation (LoRA) from the domain of large language models into dynamic power system modeling, and achieves high-dimensional data dimensionality compression through low-rank matrix BA. Simultaneously, it constructs a physical constraint collaborative matrix, embedding Maxwell's equations and Kirchhoff's laws as soft constraints or hard boundaries into representation learning, ensuring that the low-rank representation always converges to the physically feasible region. This achieves the co-evolution of physics and data within the representation space, resolving the triangular contradiction between dynamic coupling, computational efficiency, and physical consistency in dynamic operation and maintenance of power systems. This invention can significantly improve computational efficiency while ensuring physical consistency, breaking through the representation bottleneck of highly coupled dynamic systems. It is applicable to scenarios such as transient analysis, fault prediction, and dynamic operation and maintenance of power systems, possessing high precision, high efficiency, and high reliability in engineering applications.

This application relates to the field of safety monitoring technology for coal-fired power plants, and specifically to a method and device for monitoring leaks in water network pipelines of coal-fired power plants. The method includes: using a hydraulic transient analysis model as a diagnostic capability benchmark and a PINN-LSTM time-series network as a capability carrier; through the collaborative design of feature alignment and physical constraints, the carrier network achieves leak location accuracy and leak quantity estimation capability comparable to the benchmark model under transient excitation, relying solely on steady-state operating data. This application focuses on the specific scenario of frequent fluctuations in operating conditions under the background of deep peak shaving in coal-fired power plants, achieving high-precision, all-time, and low-cost monitoring through a pure software upgrade path. This fills the technical gap in the transfer of diagnostic capabilities between heterogeneous monitoring modes, fundamentally solving the engineering problem of the inability to simultaneously achieve small sample sizes, multiple operating conditions, and high precision.

This application discloses a fabrication process for additive manufacturing-hot isostatic pressing (HIP) composite gradient materials. First, the target gradient component is digitally discretized and positioned in three dimensions, dividing it into multiple gradient material filling regions and ceramic spacer medium filling regions, and the model is sliced. Then, a powder densification constitutive model is constructed using ANSYS finite element analysis, and multi-step transient analysis is performed on the entire HIP process to accurately predict component shrinkage, densification behavior, and residual stress. Subsequently, based on the sliced ​​data, a coaxial powder feeding additive manufacturing process is used to accurately fill and preform multiple components within a universal, repeatable steel sheath. Finally, the gradient component is obtained through HIP densification and post-processing. This invention uses a universal sheath instead of a customized sheath, and combines digital additive manufacturing to achieve precise and controllable fabrication of complex three-dimensional gradient structures, significantly shortening the production cycle, reducing fabrication costs, and improving the forming accuracy and performance consistency of the gradient component.

This invention discloses an online diagnostic device and method for multispectral fusion faults in power equipment, relating to the field of power equipment fault diagnosis technology. The method includes: acquiring visible light, thermal infrared, and ultraviolet spectral images of the power equipment and performing registration processing to generate a multispectral image data cube; inputting the multispectral image data cube into a dynamic kernel generation network to output a multimodal feature map set; performing a dual-path attention mechanism on the multimodal feature map set to generate a fusion feature map focusing on key regions; performing wavelet packet multi-scale decomposition on the cross-modal fusion feature map and constructing a second-level transient analysis sequence and a minute-level steady-state analysis sequence to form a multi-scale spatiotemporal feature sequence characterizing the fault evolution law. This invention achieves a leap from static analysis to dynamic full-process tracking of fault signals, enabling accurate characterization of the entire life cycle evolution law of faults.

This invention discloses a method and system for safety monitoring and early warning of deep-water subsea gas production trees. The early warning method quantifies three indicators: peak-to-average ratio, energy operator, and steady-state deviation, and uses Bayesian inference to calculate the probability of risks occurring in gas production tree components and the system. The deep-water subsea gas production tree safety monitoring and early warning system includes a gas production tree data acquisition and transmission unit, an underwater data processing unit, a risk assessment and early warning unit, and an early warning display unit. This invention can fuse multi-source features and perform transient analysis, capturing weak transient signals and multi-parameter coupled changes that characterize early failures, achieving early warning of potential risks. By constructing a dynamic risk matrix and introducing trend prediction and evolution analysis, the diagnostic dimensions are more comprehensive.

This application discloses a transient analysis method and magnetizer for the overall magnetization of a permanent magnet motor. The method involves obtaining a two-dimensional model of the permanent magnet in the rotor, dividing the two-dimensional model into multiple magnetic domain units, and determining the energy change model for each magnetic domain unit. The rotor of the permanent magnet motor is rotated multiple times at a preset angle. After each rotation, the following operations are performed: the permanent magnet in the rotor is magnetized using the magnetizer; during this magnetization process, the domain flipping state of each magnetic domain unit is determined based on the energy change model, and the remanence of the permanent magnet after this magnetization is determined based on the domain flipping state of each magnetic domain unit. The remanence of the permanent magnet after this magnetization is used as the initial state for the next magnetization; the final remanence of the permanent magnet is determined based on the remanence of the permanent magnet after the last magnetization. This application can obtain the remanence of the permanent magnet at various transient states during the magnetization process and can also obtain the cumulative magnetization effect of multiple magnetizations on the magnetic domains.

A method for analyzing the equivalent replacement and fatigue durability of high-strength steel in automotive bodies includes: calculating the thickness of the hot-formed steel replacement material using formulas for deformation resistance and energy absorption; updating the CAD model and establishing a high-precision finite element model; optimizing the model through modal testing; collecting acceleration signals from hard points on the actual vehicle and converting them into displacement signals; performing modal transient analysis and fatigue damage calculation; optimizing the structure based on the damage values ​​and evaluating the weight reduction rate and cost changes. This method can accurately determine the replacement material thickness, significantly improve simulation accuracy, greatly shorten the development cycle and verification cost, and effectively solve the fatigue durability problem of automotive bodies.

The application discloses a method and system for measuring and feeding back fuel deposition based on transient analysis, which comprises the following steps: continuously capturing the transient evolution of the plasma density profile at a time resolution meeting the requirements of transient analysis before and after the fuel pulse trigger, and accurately synchronizing the working timing of the fuel trigger, data acquisition and signal analysis; calculating the density profile change amount within the selected transient analysis time window, and obtaining the deposition position and the total deposition particle number; calculating the real fuel efficiency according to the total deposition particle number and the calibrated injected particle number, comparing the real fuel efficiency and the deposition position with the target value, and generating a control instruction to adjust the parameters of the subsequent fuel pulse in real time. The application can quickly capture the initial deposition state of the fuel in a very short time after fueling, that is, before the wall recirculation and particle transport effect significantly interfere with the measurement results, so as to realize accurate evaluation of the real fuel efficiency and synchronous acquisition of the spatial information of the deposition position.

The application provides a steam generator thermal sleeve structure mechanics analysis method and device, and the application comprises the following steps: constructing a three-dimensional finite element model based on a steam generator thermal sleeve structure, setting heat exchange parameters on a multi-material interface in the three-dimensional finite element model to establish a heat transfer correlation, configuring temperature correlation of material mechanics and thermal performance parameters based on material composition of the three-dimensional finite element model, obtaining material temperature correlation parameters and interface heat exchange parameters, applying heat exchange boundaries and pressure loads on a medium side corresponding to the thermal sleeve structure based on the material temperature correlation parameters and the interface heat exchange parameters, and simultaneously constructing time-varying loads in the whole process of start-up and shutdown and steady-state operation, and performing thermal coupling steady-state and transient analysis based on the three-dimensional finite element model, the material temperature correlation parameters, the interface heat exchange parameters and the time-varying loads. The application can accurately obtain non-uniform stress distribution caused by temperature gradient, and provides effective support for structure design and life evaluation.

The present application relates to the technical field of material physical property research, and particularly relates to a bearing lubricating oil quality detection method, a detection device and a system. The method obtains temperature and viscosity data in the bearing lubricating oil pipeline at different sampling moments, divides the viscosity data into transient viscosity and steady-state viscosity, extracts steady-state data to construct a transient analysis window with each transient viscosity as the center, obtains transient viscosity attention according to the difference in average deviation degree of adjacent transient analysis windows, and further constructs a transient viscosity compensation coefficient. The transient viscosity and steady-state viscosity at different temperatures are converted into transient standard viscosity and steady-state standard viscosity at a standard temperature. Then, the transient standard viscosity is temperature-compensated according to the transient viscosity compensation coefficient, and transient compensation viscosity is obtained, so that the bearing lubricating oil quality detection is finally performed, and the integrity of the quality monitoring data of the bearing lubricating oil during the entire detection period is ensured.