A5071376060- HVDC Systems and Fault Protection
- Silicon Carbide Semiconductor Technologies
- High-Voltage Power Transmission Systems
- Microgrid Control and Optimization
- Semiconductor materials and devices
- Power Systems and Renewable Energy
- Advanced Memory and Neural Computing
- Power Systems and Technologies
- Advancements in Battery Materials
- Advanced DC-DC Converters
- High voltage insulation and dielectric phenomena
- Vibration and Dynamic Analysis
- Electrical Fault Detection and Protection
- Advanced Battery Materials and Technologies
- Supercapacitor Materials and Fabrication
- Plasma Diagnostics and Applications
- Catalysis and Hydrodesulfurization Studies
- Superconducting Materials and Applications
- Acoustic Wave Resonator Technologies
- Hydrogels: synthesis, properties, applications
- Ultrasonics and Acoustic Wave Propagation
- Plasma Applications and Diagnostics
- Electrohydrodynamics and Fluid Dynamics
- Power Transformer Diagnostics and Insulation
- Advanced Sensor and Energy Harvesting Materials
Tsinghua Sichuan Energy Internet Research Institute
2022-2025
North China Electric Power University
2025
University of Science and Technology of China
2025
Shenzhen University
2024
Tsinghua University
2016-2024
Shanghai Electric (China)
2024
Xiamen University of Technology
2023-2024
Qingdao University of Science and Technology
2023-2024
Guangdong Polytechnic Normal University
2024
Harbin Engineering University
2023
As power semiconductor devices are the key components of hybrid DC circuit breakers (HCBs), how to select suitable is critical for whole HCB design. First, this paper compared general characteristics press pack insulated gate bipolar transistor (IGBT), injection-enhanced (IEGT), and integrated commutated thyristor (IGCT). Then working conditions were analyzed from perspective HCBs. According these, vital features including maximum turn-off current, on-state voltage, conduction ability,...
Abstract Despite the outstanding gravimetric performance of lithium–sulfur (Li–S) batteries, their practical volumetric energy density is normally lower than that lithium‐ion mainly due to low nanostructured sulfur as well porous carbon hosts. Here, a novel approach developed fabricate high‐density graphene bulk materials with “ink‐bottle‐like” mesopores by phosphoric acid (H 3 PO 4 ) activation. These pores can effectively confine polysulfides unique structure wide body and narrow neck,...
High-voltage dc (HVdc) circuit breakers (CBs) are a key technology of multiterminal (MTdc) systems and grids. In this article, state-of-the-art 500-kV hybrid CB (HCB) topology is proposed compared with other existing HCB solutions. Implementing the includes three important components: modular designed high-current bidirectional solid-state switch (SS), an ultrafast mechanical (MS) based on Thomson (CCDC) equipment no conduction loss, whose corresponding functional verification test results...
Computing-In-Memory (CIM) techniques which incorporate analog computing inside memory macros have shown significant advantages in efficiency for deep learning applications. While earlier CIM were limited by lower bit precision, e.g. binary weights [1], recent works 4-to-8b precision the weights/inputs and up to 20b output values [2, 3]. Sparsity application features also been exploited at system level further improve computation [4, 5]. To enable higher bit-wise operations commonly utilized...
Abstract Graphite has paved the way for commercial lithium‐ion batteries and shows great potential as an anode high‐energy potassium‐ion (PIBs) due to its low‐potential charge/discharge plateau. However, restricted diffusion of large K + in graphite causes difficulties generating stage‐one graphite‐intercalation compound (GIC) KC 8 at high rates results a low plateau capacity inferior rate performance. It is discovered that formation high‐stage GICs (prior 24 ) rate‐controlling step...
Different from the continuous-switching behavior of series power electronic devices in converters, single-switching attribute dc circuit breakers (DCBs) provides opportunities to integrate metal oxide varistors (MOVs), balancing circuits, and devices. This paper proposes a modular design methodology based on discrete MOVs DCB with The breaker (MDCB) topology voltage balance issues, steep front effect solution, method are proposed analyzed this paper. Compared traditional DCB, MDCB has...
DC grids, including highvoltage dc (HVdc) transmissions, midvoltage (MVdc) distributions, and low-voltage (LVdc) supply systems, have elicited widespread concern rapidly developed in recent years [1]-[6]. Voltage power can be flexibly controlled because electronic equipment is widely used grids. Moreover, the conversion stage for energy storage renewable systems grids simplified. Such simplification reduce cost, enhance efficiency, improve quality.
Hybrid dc circuit breakers (HCBs) usually require a large number of insulated-gate bipolar transistors (IGBTs) with high turn-off capability for series and parallel connections. This requirement entails excessive cost. Compared IGBTs, integrated gate-commutated thyristors (IGCTs) are another kind fully controlled power device surge current voltage but low However, the weak IGCTs hinders their application to high-powered HCBs. On basis complementary advantages IGBTs IGCTs, this paper proposes...
Abstract In this presented work, a heavy petroleum fluid catalytic cracking (FCC) process model based on the use of hybrid structural unit and bond‐electron matrix (SU‐BEM) framework molecular level has been developed. The SU‐BEM uses simplified to represent petroleum's structure chemical conversion, while retaining substantial details regarding atom‐connectivity. reaction information from FCC was characterized in terms rules, indicating conversion between units. After implementing via...
This paper gives a comprehensive analysis and characterization of power loss high-power integrated gate-commutated thyristor (IGCT) in modular multilevel converter (MMC) for high voltage dc application. The practical scheme, models, calculation methods, MMC based on IGCT are analyzed detail. Especially, comparison both half-bridge (HB-MMC) full-bridge (FB-MMC) IGCT, press-pack insulated gate bipolar transistor (IGBT), module-type IGBT, injection enhanced (IEGT), IEGT is this paper. According...
The IGCT has potential advantages in terms of efficiency, reliability, and cost for MMC applications. However, the large anode reactor, complex low power supply scheme, high driving limit application IGCTs electronics systems. We presented a comprehensive analysis, design, experiments MMCs HVdc With proposed optimal design solutions, reactor was reduced greatly. Moreover, self-excitation scheme from dc -link capacitor achieved, -frequency operation applications greatly IGCT. A experimental...
Hybrid direct current circuit breakers (DCCBs) have great prospects for the isolation of dc faults in multi-terminal grids. Current commutation from mechanical switch branch to static DCCB is precondition interrupt fault currents successfully hybrid DCCBs. A drive (CCDC) presented this study, and it has features low cost, operating losses free maintenance. Experiments been carried out on a unidirectional 44 kV prototype with CCDC. The results show 3.4 kA can be commutated by CCDC within 130...
The flue gas molten salt heat storage system is a device used to retrieve thermal energy from gas. It utilizes as the transfer medium, allowing exchange between and recover can enhance flexibility of coal-fired power plants in order balance unstable renewable energies. This paper investigates steady state transient operating characteristics using lumped parameter method, taking into account temperatures tubes bundle shell. calculation model covers under mode switching deviation design...
Integrated Gate Commutated Thyristor (IGCT) gate driver unit (GDU) is the key hub of secondary control systems and primary high-voltage high-current power devices. However, utilization discrete devices in design presents several drawbacks, including numerous components, limited electromagnetic immunity, reduced reliability, increased consumption. Consequently, trend towards chipization advancement IGCT drive technology deemed inevitable. Due to high level integration required for...
At present, it is usually necessary to use fast recovery type diodes cooperate with the switching actions of fully controlled devices such as insulated-gate bipolar transistors (IGBTs). However, specific nature working conditions diode-bridge bidirectional solid-state switch (DBSS) provides an opportunity apply standard for this purpose, which helps reduce cost switch. This letter presents self-oscillation phenomenon that caused by processes in a DBSS. Then, effects these different...
A dc chopper (DCC) is one of the key equipment in voltage-sourced converter-based high-voltage transmission systems with offshore wind power access. Combining complementary advantages concentrated and modular DCCs, a novel DCC solid-state switches resistor (MC-DCC) proposed. The non-long-term work attribute provides opportunities to apply metal oxide varistors modularizing series switches, thereby removing capacitors for voltage balance. method designing MC-DCC introduced on basis analysis...
In order to effectively reduce the commutation failure probability of line commutated converter (LCC) based high-voltage direct current transmission system, a new hybrid LCC on integrated gate thyristor (IGCT) is proposed in this letter. converter, part thyristors replaced by IGCTs. Reverse blocking IGCT capable withstanding bidirectional voltages and actively turning <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off</small> fault currents,...