A5080151767- Magnetic Properties and Applications
- HVDC Systems and Fault Protection
- High-Voltage Power Transmission Systems
- Power Systems Fault Detection
- Microgrid Control and Optimization
- Lightning and Electromagnetic Phenomena
- Electric Motor Design and Analysis
- Magnetic properties of thin films
- Advanced Algorithms and Applications
- Microstructure and Mechanical Properties of Steels
- Advanced Electrical Measurement Techniques
- Integrated Circuits and Semiconductor Failure Analysis
- Quantum-Dot Cellular Automata
- Advanced Memory and Neural Computing
- Semiconductor materials and devices
- Water Systems and Optimization
- Superconducting Materials and Applications
- Ferroelectric and Negative Capacitance Devices
- Power Transformer Diagnostics and Insulation
- Industrial Technology and Control Systems
- Caching and Content Delivery
- Chaos control and synchronization
- Power System Optimization and Stability
- Cellular Automata and Applications
- Advanced DC-DC Converters
China Three Gorges Corporation (China)
2021-2024
Chongqing University
2016-2020
Accurate high-frequency modeling of transformers is crucial for the analysis and simulations fast electromagnetic transients power systems smart grids. However, most models do not include effects core nonlinearity may lead to inaccurate results. This article proposes an improved wideband model considering single-phase two-winding its implementation in Electromagnetic Transients Program (EMTP). The hybrid developed by merging admittance module duality-derived π using filters with...
<title>Abstract</title> This paper explores the dynamics of large-scale offshore wind farms comprised full-power variable frequency turbines, interconnected with flexible HVDC (High Voltage Direct Current) converter stations. These systems are susceptible to broad oscillations due rapid response characteristics power electronic devices, potentially compromising their operational safety and stability under various conditions. To mitigate impact these on turbines connected systems, study first...
Amorphous alloy is increasingly widely used in the iron core of power transformer due to its excellent low loss performance. However, potential harm system not fully studied during electromagnetic transients transformer. This study develops a simulation model analyze effect materials on ferroresonance. The based π equivalent circuit. flux linkage–current (ψ–i) Jiles–Atherton reactor developed an Electromagnetic Transients Program-Alternative Program and represent magnetizing branches model....
This paper proposes an improved centered cycle method for identifying the Preisach distribution function based on non-uniform discretization. The principle and limits of are first introduced. Then, discretization is proposed curvature anhysteretic magnetization curve. numbers loops decided by proportion integral curvature. to determine cell values non-uniformly discrete triangle also validated laboratory test a toroidal sample. results show higher precision predicting hysteresis loop than...
The inrush current is one of the most common low-frequency transients, and crucial for transformer studies design. Core materials have an impact on transformers due to their different magnetizing characteristics. However, how differences affect currents influence level need be further studied. In this paper, effect core materials, namely, grain-oriented silicon steel, grain non-oriented amorphous alloy nanocrystalline alloy, investigated. Experiments are carried out compare peak values these...
Inductive voltage transformers (VTs) are the most widely used instrument in power grids operating at 35 kV and below. Frequently, however, during disturbances, secondary signals not replicas of primary voltages because eddy current effects, capacitive nonlinearities. In this two-part paper, a new inverse method considering frequency-dependent characteristics nonlinearities is proposed to reconstruct from distorted signal. Part I, framework presented then realized with two models. An...
Hydraulic turbine control system is a complex with strong nonlinearity and multiple variables. Therefore, in order to better the system, it necessary obtain parameters of key components. Aiming at limitation traditional particle swarm optimization algorithm global search ability, mutation operator dynamic inertia weight coefficient are introduced enhance ability algorithm. In addition, further improve performance algorithm, this paper combines optimized genetic form hybrid parameter...
Ferroresonance is complicated phenomenon for its various modes. In this paper, two nonlinear features are extracted based on analytical Technique. The can be used to analyze the motion characteristics of ferroresonance system overvoltage time series. study acquired from a power substation shows that feature very useful mode identification, especially quasi-periodical and chaotic ferroresonance.
As a typical nonlinear system, the modular multilevel converter (MMC) contains highly coupled states. The conventional feedback-error-based control scheme is designed on basis of classical linear system theory, which may be inadequate regarding dynamic performance. Feedback linearization (FBLC) has been studied to improve effect. However, existed MMC model for FBLC neglects impacts capacitor voltage harmonics in submodules. This paper derives law by considering model. detailed calculation...
The small-signal stability problem of power electronic converters has always been a critical concern for safe operation. This paper conducts comprehensive analysis the hybrid modular multilevel converter (MMC), which is promising in application future over-head-line high-voltage-direct-current transmission. impacts strong and weak AC system connection are comparatively researched through eigenvalue-based analysis. newly emerging factors that hamper identified integration. work this provides...
Ferroresonance is a complex phenomenon in power systems for its very complicated behavior. This paper proposes new method ferroresonance behavior analysis using it steady state peak voltage value distribution on three-dimensional space, by which the can be clearly detected with change of system parameters. Then, pulse suppression strategy also proposed. Pulse width modulation and proportional-integral (PI) control methods are used strategy. Simulation study shows that fundamental,...
The hybrid modular multilevel converter (MMC) is promising in the application of over-head-line-based high-voltage-direct-current (HVDC) transmission. bandwidths signal filters for control system may impose distinct impacts on small-signal stability. Based model, this paper investigates through root locus analysis and recognizes critical every filter. master or slave modes as well inverter rectifier operation status are comprehensively considered calculation. eigenvalue studies certificated...