A5101873124- Microgrid Control and Optimization
- HVDC Systems and Fault Protection
- Power Systems and Renewable Energy
- Islanding Detection in Power Systems
- Wind Turbine Control Systems
- High-Voltage Power Transmission Systems
- Particle Accelerators and Free-Electron Lasers
- Nuclear Physics and Applications
- Photovoltaic System Optimization Techniques
- Hybrid Renewable Energy Systems
- Force Microscopy Techniques and Applications
- Fault Detection and Control Systems
- Advanced Surface Polishing Techniques
- Smart Grid Energy Management
- Image Retrieval and Classification Techniques
- Machine Fault Diagnosis Techniques
- Integrated Circuits and Semiconductor Failure Analysis
- Adaptive Control of Nonlinear Systems
- Integrated Energy Systems Optimization
- Particle accelerators and beam dynamics
- Chaos-based Image/Signal Encryption
- Carbon Dioxide Capture Technologies
- Manufacturing Process and Optimization
- Indoor and Outdoor Localization Technologies
- Phase Equilibria and Thermodynamics
North China University of Water Resources and Electric Power
2019-2025
Qinghai Normal University
2022-2024
Qinghai University
2023-2024
Zhejiang University
2024
Nanjing University of Science and Technology
2023
Dahua Technology (China)
2023
Qinghai New Energy (China)
2023
First Affiliated Hospital of Nanchang University
2021
Nanchang University
2021
Academy of State Administration of Grain
2021
The Virtual Synchronous Generator (VSG) control strategy has garnered widespread application during the low-voltage ride-through (LVRT) of distributed energy resources integrated into power grids, primarily due to its inertia and damping properties. However, grid voltage dips frequently coincide with unbalanced conditions harmonic disturbances, against which traditional VSG LVRT strategies offer limited resilience, resulting in unstable grid-connected currents. Consequently, this impacts...
Due to the nonlinearity, strong coupling and hysteresis of parameters used in measuring grain drying process, it is always a challenge perform accurate control system. The purpose this paper describe design suitable neural network model dryer more effectively. First, operating mechanism continuous principle heat mass transfer that can be process was analyzed before an intelligent system designed accordingly. Second, based on Back Propagation Neural Network (BPNN) developed. BPNN optimal...
As the grid-connected capacity of a large number wind farms continues to increase, their short-circuit current will have great impact on protection. Therefore, accurate calculation is beneficial for correct protection action evaluation. Considering issues related diversity turbine types in and inability accurately simulate failure transient process previous studies, this research focuses investigating control strategies during faults turbines. In paper, single-machine equivalent model...
The wide application of switched reluctance motor has been limited due to its high acoustic noise, which is mainly caused by radial vibration. In this study, a new vibration model proposed consisting acceleration impulse and natural oscillation model. developed based on the measured sample data using least‐square support vector machine method. Natural also superposition each frequency, obtained finite element built up in MATLAB/Simulink various experiments have conducted verify accuracy
Distributed generators using power electronic converter interface have no inherent inertial response similar to that from the rotating mass of conventional synchronous generators. Virtual generator (VSG) emulates behavior including system inertia improve dynamic performance. Unlike a real generator, VSG with proper design, equivalent distributed can be controlled in wider range. In this paper, flexible virtual (FVSG) control strategy is proposed, adaptive contributing fast and smooth...
This paper presents the design of an HTS magnet for ultra compact MRI system, potentially rapid and early diagnosis brain trauma. Early therapy stratification can reduce risk critically ill patients with use near patient imaging, aid precision medicine. High temperature superconductors (HTS) have ability to carry large currents in cryogen free contrition, which make system even smaller lighter. The Genetic Algorithm (GA) optimization were based on FEM package COMSOL Multiphysics LiveLink...
The performance of CO 2 absorption into diethylenetriamine (DETA) solvent and desorption from rich DETA were experimentally investigated in a lab‐scale capture test bed. And the results compared with monoethanolamine (MEA) solvent, which is standard for industry. Also, effects concentration, lean loading, temperature, flow rate flue gas on MEA loading regeneration studied. showed that had faster higher cyclic capacity than solvent. to strip same amount , needed less energy In addition, also...
Sleep stage classification is crucial for detecting patients' health conditions. Existing models, which mainly use Convolutional Neural Networks (CNN) modelling Euclidean data and Graph Convolution (GNN) non-Euclidean data, are unable to consider the heterogeneity interactivity of multimodal as well spatial-temporal correlation simultaneously, hinders a further improvement performance. In this paper, we propose dynamic learning framework STHL, introduces hypergraph encode sleep...
In this paper, a method of reconstructing three-dimensional magnetic stray fields on the surface recording head using reflection electron beam tomography is presented. An algorithm for flux density in three dimensions from deflection vectors beams has been developed and tested. application to one-turn coil model, which used as simplest model head,
More and more Doubly-fed Induction Generators (DFIG) have a low voltage ride through (LVRT) capability, which needs to provide reactive power for the grid during ride-through period. Traditional short-circuit current calculation of DFIG ignore influence support on current; it is assumed that rotor zero when Crowbar input after fault. This inaccurate will indirectly affect protection's operating characteristics produce certain errors. Specially, in China's new grid-connected wind standards,...
With the enlarging scale of doubly-fed induction generators (DFIGs) connected to power systems, it is important analyze influence a short-circuit current system relay protection. Due correct evaluation protection operation characteristics, DFIG needs be calculated accurately. But research on based following assumption: rotor excitation zero after crowbar put, and its dynamic process ignored. This will bring errors calculation results. paper takes into account dynamics by studying mechanism...
The transient characteristics of wind farms in groups are quite different; addition, there is a strong coupling between the and grid, these factors make fault analysis grid with farm complicated. In order to solve this problem, mathematical model converter established based on input-output external converter, doubly fed turbine (DFIG) presented considering influence low-voltage ride-through control (LVRT) effect mechanism LVRT strategy short-circuit current analyzed. Finally, calculation...
The riveting joint is the main connection method in aircraft assembly. There are some kind of rivets, such as slug rivet and protruding rivet, that quality will be impacted while rivets axis not coincident with plate holes axis. By using finite element ABAQUS software, this paper built 3D structure element, analyzed deviation effect on deformation, stress strain riveting. Through statistical data, relationship among value, built.
Squirrel-cage asynchronous motors are modeled and analyzed by combining the basic modules S-function from Matlab/Simulink. And algorithm of solving stator current flux improved to increase accuracy model. The simulation results current, rotor speed torque under condition increasing load given. simulations demonstrate that model built in two-phase αβ stationary frame is more accurately reflecting actual situation running motors.
The alpine regions are characterized by low temperatures and abundant sunlight, such as Northwest China, most forms of energy storage (ES) not suitable, like electrochemical ES. This paper proposes a method for optimal siting sizing hydrogen (HES) considering the spatio-temporal arbitrage promoting solar consumption. Firstly, build framework hydrogen-electricity coupling system (HECS), to meet demand PV-friendly grid connection develop sales industry chain increase revenue. Then model HES is...
The riveting joint is the main connection to fasten two thin-walled sheet-metal parts in aircraft assembly. As one of important parameters process, force mostly determined by experience and experiments actual production, lack theoretical basis supported. This paper researched maximum allowed value elastic deformation stage process. Based on theory compression instability, mathematics model relationship among rivets diameter, rivet holes diameter was built. Then, using software for finite...
<title>Abstract</title> In order to bolster the security of image encryption, this investigation presents a color encryption algorithm founded on an improved dual-chaotic system integrated with DNA encoding. The initial step involves formulating Logistic chaotic system, permitting arbitrary real numbers for mapping range, values, and parameter values. This enhanced in conjunction values from hyper-chaotic Chen is derived by integrating plaintext image, thereby generating keys associated...
Under the background of high permeability, voltage feedforward control may further weaken stability grid-connected inverter (GCI) systems and cause sub-synchronous oscillation in extreme cases. To solve this problem, paper firstly considers influence frequency coupling effect control, adopts harmonic linearization method to construct L-type GCI sequence admittance model with PI (proportional integral) PR resonant) respectively. By comparing characteristics under two strategies, combined...
In this paper, when the stator fault, input voltage of motor are deduced, based on mathematical model induction in αβ reference frame. Establish and simulate fault three-phase to get currents. Using filters remove 50 Hz fundamental component currents, then do spectral analysis these The simulation results can detect a clear (1/n <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">p</inf> ) f xmlns:xlink="http://www.w3.org/1999/xlink">1</inf>...