A5039974136- Silicon Carbide Semiconductor Technologies
- Advanced DC-DC Converters
- Electromagnetic Compatibility and Noise Suppression
- High-Voltage Power Transmission Systems
- Power Systems and Renewable Energy
- Multilevel Inverters and Converters
- Smart Grid and Power Systems
- Microgrid Control and Optimization
- Semiconductor materials and devices
- Power Systems and Technologies
- Advancements in Semiconductor Devices and Circuit Design
- HVDC Systems and Fault Protection
- Electric Motor Design and Analysis
- Electrostatic Discharge in Electronics
- Thin-Film Transistor Technologies
- High voltage insulation and dielectric phenomena
- Quantum Mechanics and Applications
- Sensorless Control of Electric Motors
- Geochemistry and Geologic Mapping
- Neurobiology of Language and Bilingualism
- Quantum Information and Cryptography
- Photonic and Optical Devices
- Advanced Battery Technologies Research
- Geoscience and Mining Technology
- Power Transformer Diagnostics and Insulation
École Polytechnique Fédérale de Lausanne
2024-2025
North China Electric Power University
2008-2024
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources
2024
University of Bristol
2018-2024
Aalborg University
2021-2023
Fujian Normal University
2023
University of Shanghai for Science and Technology
2021
Xi'an University of Technology
2020
Dalian Naval Academy
2009-2019
National Engineering Research Center of Electromagnetic Radiation Control Materials
2019
Recent developments within the field of medium voltage wide-bandgap semiconductor devices are drawing attention from both researchers and industries due to demanding requirements for more efficient high-power energy conversion. The rapid development has entailed an increased awareness negative impact rate change in voltage, d <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">v</i> /d xmlns:xlink="http://www.w3.org/1999/xlink">t</i> , its...
Due to its time-varying nature, oscillator phase noise can significantly degrade the performance of channel estimation, carrier recovery, and data detection blocks in high-speed wireless communication systems. In this paper, we propose a new data-aided joint channel, frequency offset (CFO) estimator for orthogonal division multiplexing (OFDM) relay For transmission phase, iterative receiver that tracks detects transmitted symbols. Additionally, derive hybrid Cramér-Rao lower bound evaluating...
Summary Nuclear magnetic resonance (NMR) was used to investigate the exposure between carbon dioxide (CO2) and sandstone matrix with a permeability of 0.218 md porosity 9.5% at 40°C 12 MPa (immiscible condition). Minimum miscibility pressure (MMP) oil CO2 17.8 MPa, determined by slimtube test 40°C. The process included first, second, third, fourth experiments. Before each experiment started, there CO2-injection stage injection under constant rate keep fresh (concentration is 100% in gas...
This article rethinks the basic assumptions often used in analytically modeling parasitic capacitance inductors. These are classified two commonly-used physics-based analysis methods: lumped capacitor network method and energy conservation method. The lumped-capacitor is not proper solution for calculating equivalent inductors at first resonant frequency, but rather represents above last frequency. energy-conservation based shown to be more accurate a reasonable model Multiple case studies...
In the hardware design of battery energy storage system (BESS) interface, in order to meet high-voltage requirement grid side, integrating 10-kV silicon-carbide (SiC) MOSFET into interface could simplify topology by reducing component count. However, conventional gate driver is challenging and inextensible BESS, since rating high dv/dt bring requirements isolation low common-mode capacitance. Therefore, this article, a scalable converter-based self-powered (SCS) further proposed. A 5-kV...
Passive clamping snubbers for voltage balancing (VB) series-connected power devices exhibit strong applicability and high robustness; moreover, they are particularly suitable the emerging fast-switching silicon-carbide (SiC) metal-oxide-semiconductor field-effect transistors ( <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">mosfet</small> s). However, compromise still exists as a better VB performance comes at penalty of larger loss snubber....
A lateral double diffused metal oxide semiconductor transistor with the semi-superjunction (semi-SJ LDMOS) is optimized based on normalized current-carrying capability (CC) and experimentally realized in this letter. The device fabricated an equivalent substrate semi-SJ introduced near source. increases local doping concentration N regions meanwhile reduces current path area carrier mobility, resulting variation of CCs before after introduction semi-SJ. CC factor η <sub...
In high-power medium-voltage applications, inductors usually have multiple windings on a single core, due to the high inductance value and current stress. The coils are electronically connected in either series or parallel, with considerations of loss cost. However, differences parasitic capacitance using parallel connections not discussed. Therefore, this article reveals that comparison for windings, utilizing connection winding can significantly reduce multiwindings without sacrificing...
With the development of smart grid, a large amount monitor equipment is employed to supervise condition power cable. Because its convenience, extracting electric energy from cable via current transformer promising technique used in supply for these pieces monitoring equipment. In this paper, an enhanced harvesting method based on resonant state proposed. method, capacitor adopted resonate with equivalent magnetizing inductor transformer. Therefore reactive compensated, thus harvested...
Dual-channel gate driver is commonly utilized in the industry for accommodating widespread use of half-bridge power modules.As wide-bandgap devices become increasingly prevalent due to their superior switching characteristics compared with conventional silicon devices, this paper proposes a design SiC MOSFET module.In particular, adapting case higher voltage requirement, proposed includes novel active balancing circuit, which contributes aggregation module into single device double...
When operating up the base speed, permanent magnet synchronous motor(PMSM) is usually controlled by flux-weakening methods, which realized generating d-axis demagnetization current and then lowers system efficiency. Limited inverter voltage level, motor output power has also been limited. In this paper, we proposed a bus variable PMSM drive based on quasi-Z-source, expecting to improve Experimental results prove feasibility of scheme.
In order to study the flashover mechanism of polluted insulators under AC voltage, a new arc propagation criterion which is based on an root voltage gradient proposed. This can explain variation in process. Based this criterion, distributed parameter electrical circuit model presented. The channel considered as equivalent instead using voltage-gradient equation. parameters are obtained from electromagnetic field distribution and gas discharge theories. parallel paths including layer. related...
Stress is an important aspect of human psychology. Many measures stress have been developed over the years, but different issues exist for most these measures. This study introduces Mobile Photographic Meter (MPSM), a new way to measure in which user simply selects image that best captures his or her level. Such tool allows researchers quickly real time and natural environments less onerous user. Our results show MPSM valid stress. Users find it easy actually enjoyable use. also strongly...
An efficient closed-loop voltage tracking control (VTC) for a grid-forming-based converter is required precise regulation. However, few papers designed VTC exclusively modular multilevel (MMC) with full understanding of the MMC's internal dynamic coupling and presented detailed analysis controller. In contrast, traditional voltage–current double loop or its derivatives are employed without considering impact coupled fluctuating capacitor insufficient stability under various operating...
In modern smart electric grids, power cables are supervised by a large number of monitor equipments. many field application cases, current transformers (CT) employed to extract electrical from these high voltage supply monitoring circuits. this paper, in order harvest maximum cables, key parameters the rectifier with transformer circuits analyzed, and design considerations discussed. A frequency PWM control scheme is proposed regulate output regulating circulation duty ratio. Theory analysis...
The single gate driven series connected power device stack possesses the advantages of high compactness and low cost. However, research its short circuit (SC) characteristic remains uncovered. This article fills this gap points out that, with driver it has potential over-current limitation. Furthermore, based on it, an improved silicon carbide (SiC) metal-oxide-semiconductor field-effect transistor <sc xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Power versus time (PVT) variation is one of the most important features for describing electrothermal performance RF power amplifiers (PAs) global system mobile communication/digital cellular bands. The PA sometimes produces high at first slot and low second slot, which results in similar temperature caused by its self-heating effect. Therefore, both theoretical experimental investigations are carried out capturing effects on GaAs-based heterojunction bipolar transistor (HBT) PAs....