A5026576438- Power System Optimization and Stability
- HVDC Systems and Fault Protection
- Power Systems and Renewable Energy
- Microgrid Control and Optimization
- Advanced DC-DC Converters
- Multilevel Inverters and Converters
- High-Voltage Power Transmission Systems
- Smart Grid and Power Systems
- Silicon Carbide Semiconductor Technologies
- Smart Grid Energy Management
- Energy Load and Power Forecasting
- Power Quality and Harmonics
- Power Systems Fault Detection
- Optimal Power Flow Distribution
- Electric Power System Optimization
- Frequency Control in Power Systems
- Integrated Energy Systems Optimization
- Vibration and Dynamic Analysis
- Wind Turbine Control Systems
- Power Transformer Diagnostics and Insulation
- Power System Reliability and Maintenance
- Wireless Power Transfer Systems
- UAV Applications and Optimization
- Robotic Path Planning Algorithms
- Machine Fault Diagnosis Techniques
Northeast Electric Power University
2015-2024
Fujian Business University
2022
Fujian Chuanzheng Communications College
2022
Electric Power University
2022
North China Electric Power University
2011-2020
Khalifa University of Science and Technology
2016
National University of Singapore
2006-2011
Sun Yat-sen University
2010
A novel soft-switching hybrid converter combining the phase-shift full-bridge (FB) and half-bridge (HB) LLC resonant converters' configuration with shared zero-voltage switching (ZVS) lagging leg is proposed to ensure switches in operating at fully ZVS condition. The dual outputs of FB-HB are connected series whole dc-output voltage can be regulated by PWM control within desired range. circuit used secondary side FB reset primary current during freewheeling period, as well transfer more...
This study presents the experimental and analysis of double‐LCL resonant compensation network based wireless power transfer (WPT) system for electric vehicles. The WPT could accomplish both constant current unity‐power‐factor transmitting terminal receiving terminal. In addition, inverter can achieve zero‐voltage‐switching. multi‐physical characteristics terminals on LCL are analysed in detail. Finally, three‐dimensional finite element an with circular pads is setup to verify theoretical...
Motivated by the need to regulate and regularly inspect construction sites, we developed a real-time robust drone system that performs site inspection violation detection in sites. The proposed uses monitor numerous types of sites remotely from any control station or nearby locations. Our was as an entry participate "Drones For Good" 2015 competition, qualified finals. technological solution presented this paper introduces possible utilization technology industry. We will first introduce...
In this paper, a new cascade active-front-end converter based on dual-boost/buck converters is proposed for an intelligent universal transformer (IUT), which allows adjusting the power factor to control both active and reactive powers between medium low voltage levels. Compared traditional H-bridge converter, it has much enhanced system reliability owing no shoot-through problems lower switching loss with help of using MOSFETs. addition, unified scheme active-reactive individual balancing...
The input-parallel output-parallel (IPOP) dc–dc converters are suitable for low-voltage and high-current applications, especially using high-frequency isolation instead of traditional line-frequency transformer ac–dc in dc distribution. Compared to the existing closed-loop control IPOP converters, magnetic-coupling current-balancing (MC-CB) cells based <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LLC</i> resonant converter modules proposed...
A novel hybrid <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LLC</i> resonant and dual active bridge (DAB) linear dc–dc converter is proposed as bus converter, which can achieve soft switching constant output voltage gain at both the open-loop light load closed-loop heavy conditions. This paper focuses on its continuous-time average modeling in detail based dc voltage, first order terms of two transformer currents capacitor results a...
This paper introduces the high-frequency link concept into modular multilevel converter (MMC) topology, which can totally reduce individual dc-link capacitors at high-voltage side. The proposed converter, called isolated MMC, has basic triple ports of medium-voltage ac, dc, and low-voltage dc. Thus, it is especially suitable for hybrid dc ac applications in power generation transmission, such as solid-state transformer. fundamental principle applied control scheme phase-shift pulsewidth...
In a microgrid, the distributed generators (DG) can power user loads directly. As result, quality (PQ) events are more likely to affect users. This paper proposes Multiresolution Generalized S-transform (MGST) approach improve ability of analyzing and monitoring in microgrid. Firstly, time-frequency distribution characteristics different types disturbances analyzed. Based on characteristics, frequency domain is segmented into three areas. After that, width factor window function set MGST has...
This paper introduces a novel H-bridge structured ac-ac pulsewidth modulation (PWM) converter topology based on two-level non-differential ac chopper legs, which can work at the non-inverting and inverting modes for utility voltage compensation. Compared to traditional bipolar-type converter, no bidirectional switches are switched in complementary manner overcome commutation problem due delayed response of electronic circuits semiconductor switching devices. The detailed PWM control signals...
A novel single-phase pulsewidth modulation (PWM) direct ac-ac converter based on two-level nondifferential dual-buck ac chopper legs with inverting and noninverting operations is first proposed in this article. It has the ability to resolve both voltage sag swell problems at same time when used as distributed flexible conditioner. Compared traditional converter, it much enhanced system reliability thanks no shoot-through even all switches of each are turned on, therefore, PWM dead not needed...
The stability problem of steam valves in a single machine infinite bus system with thyristor controlled series compensation is addressed through the use an improved adaptive backstepping method based on error compensation. combines sliding mode variable structure control, control and control. Initially, excitation input are simultaneously obtained design virtual by Lyapunov method. function then constituted stages to achieve subsystem stability, before obtaining parameter updating law...
In this paper, a line modal potential energy (LMPE) method is proposed for the interarea oscillation analysis and damping control of doubly fed induction generators (DFIGs). This paper presents novel attempt to design loop using LMPE approach from network viewpoint. First, an function containing DFIG output constructed. The distribution characteristics in are analyzed different modes, dominant mode system identified. addition, provides basis regulation. Second, wide-area signals locations...
Abstract Severe disturbances in a power network can cause the system frequency to exceed safe operating range. As last defensive line for emergency control, under load shedding (UFLS) is an important method preventing wide range of excursions. This paper proposes hierarchical UFLS scheme “centralized real-time decision-making and decentralized control” inter-connected systems. The centralized decision-layer takes into account importance based on equivalent transformation kinetic energy (KE)...
A novel bidirectional transformerless photovoltaic (PV) inverter based on the high-frequency leg (HFL) technique is proposed which can work discontinuous current mode/continuous mode having greatly enhanced reliability. With leg, smooth ac achieved as higher equivalent switching frequency reduce inductor ripple decreasing passive components' volume. There no dead time issue push duty cycle to theoretical limit and fully transfer energy grid through total pulse width modulation. And capacity...