A5101700227- Advanced Battery Technologies Research
- Advanced DC-DC Converters
- Multilevel Inverters and Converters
- Microgrid Control and Optimization
- Vibration and Dynamic Analysis
- Optical Network Technologies
- Thermodynamic and Exergetic Analyses of Power and Cooling Systems
- Additive Manufacturing Materials and Processes
- Silicon Carbide Semiconductor Technologies
- Welding Techniques and Residual Stresses
- Numerical methods in engineering
- Drilling and Well Engineering
- Electric Vehicles and Infrastructure
- Aerodynamics and Acoustics in Jet Flows
- Industrial Technology and Control Systems
- Supercapacitor Materials and Fabrication
- Advanced Sensor and Control Systems
- Electromagnetic Simulation and Numerical Methods
- Advanced Fiber Optic Sensors
- Fuel Cells and Related Materials
- Advanced Photonic Communication Systems
- Geomechanics and Mining Engineering
- Composite Structure Analysis and Optimization
- Radiative Heat Transfer Studies
- Tunneling and Rock Mechanics
Tianjin University
2014-2024
Ningxia Medical University
2024
Nankai University
2023-2024
Sinopec (China)
2023
Wenzhou University
2021-2022
Shandong Institute of Business and Technology
2022
Harbin Engineering University
2011-2021
University of New Brunswick
2018-2019
Energie NB Power (Canada)
2018
China University of Petroleum, Beijing
2017
With wide-spread application of power electronic converters in high systems, there has been a growing interest system reliability analysis and fault-tolerant capabilities. This paper presents comprehensive review conventional techniques regarding case semiconductor device failures. These can be classified into four categories based on the type hardware redundancy unit: switch-level, leg-level, module-level, system-level. Also, various methods are assessed according to cost, complexity,...
Due to the long cold start time and slow dynamics of proton exchange membrane (PEM) fuel cell (FC) stack, operating modes transfer control strategy for uninterruptible power supply (FC-UPS) is different from traditional (UPS) system. In this paper, a seamless strategy, which suitable FC-UPS, proposed. The conversion architecture FC-UPS presented with characteristic analysis PEMFC requirements UPS. Then, scheme investigated. proposed not only capable guaranteeing load voltage, but also...
In order to increase the power density of factor correction converter, a novel integrated structure for both electromagnetic interference (EMI) filter and boost inductor is proposed with flexible multilayer foil integration technique, which can reduce volume these passive components. Also, performance investigated based on distributed component model. Furthermore, design procedure detailed. Finally, prototype EMI has been built experiments demonstrate validity structure.
PV arc-faults can cause fires, damage property, and endanger people's lives. This paper proposes a method for detecting DC arcs using artificial intelligence (AI). The four steps arc detection are thoroughly described. After removing the low-frequency range (41 kHz) high-frequency (>102.5 components, middle frequency is left analysis. For AI analysis, eight inputs used. time sequence tasks also explained, where parallel task configuration adopted to save time. Furthermore, model training...
This paper investigates a three-phase four-wire fuel cell power system. The system is sensitive to the load characteristic in stand-alone mode, because variation or unbalance of will affect safety and lifespan cell. A novel management unit (PMU) with its control strategy proposed. PMU can compensate slow dynamics. In addition, acts as dc bus capacitors deal low-frequency current ripple. Therefore, large electrolytic be eliminated derived whole verified by experimental results.
In order to enhance the power density of factor correction (PFC) converters, an integrated structure for both electromagnetic interference filter and boost inductors is presented with flexible multilayer foil integration technique. The analysis proposed given, calculations circuit parameters are provided. A prototype 1-kW PFC converter has been built. experimental results included prove validity structure.
In large PV plants, a number of inverters are linked together at grid-side to generate more power. However, as the inverter modules increases, ground current problem worsens. This can result in fault, and cause failed disconnected from grid. this paper, solutions, including hardware software, proposed suppress current. The solution is connect filter capacitors back DC-bus, directing rather than grid reduce Additionally, software carrier phase shifting frequency shifting, proposed. for be...
Field experiences have demonstrated that semiconductor devices are vulnerable to failures, which challenges the reliability of power conversion systems. One most effective methods enhance system is fault-tolerant techniques. Presently, parallel redundant converter approach considered as one methods. However, there some issues regarding systems, such surge currents nonfaulty converters experience after faults, fault-isolation time, and load voltage distortion. To address these issues, this...
LLC resonant converter is an excellent candidate for medium power DC/DC converter. However, it usually used in constant voltage output application. As the stage high efficiency LED driver, may vary widely while current remains constant. This paper proposes a new design method which suitable wide range Design process, analysis and optimization of parameters are also discussed detail. A 140W experimental prototype built to verify proved after optimization. Experimental result shows good...
An unstructured finite-volume time-domain method (UFVTDM) is developed to solve two-dimensional transient heat conduction in multilayer functionally graded materials (FGMs). A four-node quadrilateral grid and a three-node triangular are employed deal with mixed-grid problems. The accuracy of the improved by treating as bilinear element consideration both linear term constant term. improvement validated be vital avoid violent numerical oscillation when applying point-source capability UFVTDM tests.
Fuel cell (FC) power system is considered as an alternative energy generation in the future. This paper studies bidirectional DC/DC converter for a 30kW three-phase fuel system. The FC sensitive to load characteristics stand-alone mode, because rapid change or unbalance of will endanger safety and expectancy cell. with storage component used provide dynamic avoid fast changing output. In addition, it acts DC bus capacitors absorb low frequency current ripple. Therefore, separated from ripple...
The power rating of Uninterrupted Power Supply (UPS) has been increasing continuously. In the near future it will increase to MW and dozens MW. Reliability environmental friendliness are critical issues for this application. Aiming at requirements ultra-high UPS, paper proposes a concept Super UPS using multiple energy sources (Grid, Gas Turbine (GT), Fuel Cell (FC), Li-ion Battery (LB) Photovoltaic (PV)) boost reliability system improve friendliness. Firstly, four typical structures...
A brief review of recent progress in researches, productions and applications full distributed fiber Raman photon sensors at China Jiliang University (CJLU) is presented. In order to improve the measurement distance, accuracy, space resolution, ability multi-parameter measurements, intelligence sensor systems, a new generation technology based on optical nonlinear scattering fusion principle proposed. series are investigated designed, which consist ultra-long distance Rayleigh integrated...
Field experiences have demonstrated that semiconductor devices are vulnerable to failures (open-& short-circuit). In many critical applications, such unacceptable and high system reliability is required. this paper, a topology modification for the T-type 3-level inverter explored achieve fault-tolerant operation enhance in case of device open-circuit or short-circuit failures. With proposed (via fewer additional switches), failure ride-through performance can be dynamically achieved without...
Microgrid is an effective approach to manage renewable resource generations, energy storage systems and various loads provide high quality power. Due the intermittence of generation, as well constantly changing load demand, are often proposed balance supply-demand in microgrid. To address issues centralized control strategies, i.e. single point failure, information congestion, etc., this paper proposes a distributed suboptimal strategy maintain by controlling battery system. Only exchange...
The use of electric vehicles (EVs) for household uninterruptible power supplies (UPSs), particularly in rural areas, can greatly improve reliability. However, because EVs are mobile, the evaluation backup capacity EV-UPS systems is completely different when compared to traditional UPSs. As a result, focus this paper on and improvement systems. architectures presented first. methodology calculating then presented, followed by four detailed cases based grid failure times. Furthermore, impact...
It is simple to implement conventional current control with a proportional integral (PI) controller. However, system stability and dynamic performance are not perfect, particularly when operating under unfavorable conditions. In this paper, an improved method proposed by introducing compensation unit. The unit can effectively compensate the system’s phase around crossover frequency, greatly enhancing margin stability. also capable of handling weak-grid concept explained first. Then,...