A5083064778- Microgrid Control and Optimization
- Multilevel Inverters and Converters
- Advanced Battery Technologies Research
- Advanced DC-DC Converters
- Electric Motor Design and Analysis
- Electric Vehicles and Infrastructure
- Smart Grid Energy Management
- Magnetic Bearings and Levitation Dynamics
- Islanding Detection in Power Systems
- Magnetic Properties and Applications
- Electric and Hybrid Vehicle Technologies
- Silicon Carbide Semiconductor Technologies
- Underwater Vehicles and Communication Systems
- Energy Harvesting in Wireless Networks
- Sensorless Control of Electric Motors
- Wireless Power Transfer Systems
- Innovative Energy Harvesting Technologies
- Electrical Contact Performance and Analysis
- Hybrid Renewable Energy Systems
- Vacuum and Plasma Arcs
- Advancements in Battery Materials
- Advanced battery technologies research
- HVDC Systems and Fault Protection
- Insect and Arachnid Ecology and Behavior
- Induction Heating and Inverter Technology
University of Southampton
2015-2024
Physical Sciences (United States)
2023
University of Nottingham
2015
Beijing Institute of Technology
2014
Fuzzy logic is used to define a new quantity called the battery working state (BWS), which based on both terminal voltage and of charge (SOC), overcome problem over-discharge associated damage resulting from inaccurate estimates SOC. The BWS by fuzzy energy-management system plug-in series hybrid electric vehicle (HEV) make decision power split between engine, demand, while controlling engine work in its fuel economic region. management was tested real time using an HEV simulation test bench...
Line-interactive uninterruptible power supply (UPS) systems are good candidates for providing energy storage within a microgrid to help improve its reliability, economy, and efficiency. In grid-connected mode, can be imported from the grid by UPS charge battery. Power also exported when required, e.g., tariffs advantageous. stand-alone supplies local distributed loads in parallel with other sources. this paper, line-interactive control system presented discussed. flow is controlled using...
The prevention of thermal runaway (TR) in lithium‐ion batteries is vital as the technology pushed to its limit power and energy delivery applications such electric vehicles. TR resulting fire explosion have been responsible for several high‐profile accidents product recalls over past decade. Herein, causes are described novel preventative methods examined, approaching problem from different angles by altering internal structure battery undergo shutdown or developing management systems so...
This paper is concerned with the design and control of a three-phase voltage source grid-connected interleaved inverter. topology enables use low-current devices capable switching at high frequency, which together ripple cancelation feature reduces size output filter inverter considerably compared to an equivalent classical two-level LCL using high-current lower frequency. Due its higher frequency low-filter component values, also has much bandwidth than inverter, improves grid harmonics...
This paper investigates the problem of low-frequency voltage oscillations that appear at neutral point (NP) a three-level neutral-point-clamped (NPC) converter. Starting with detailed analysis their origin, derives minimum amplitude these can be achieved by nearest-vector (NV) modulation strategies. It then proves criterion direction dc-link capacitor imbalance, which is commonly adopted NV strategies for performing task balancing, poses barrier in achieving this minimum. A new proposed...
In some situations, utilities may try to “save” the fuse of a circuit following temporary faults by de-energizing line with fast operation an upstream recloser before is damaged. This fuse-saving practice accomplished through proper time coordination between and fuse. However, installation distributed generation (DG) into distribution networks affect this due additional fault current contributions from resources. phenomenon recloser-fuse miscoordination investigated in paper help typical...
In inverter-based microgrids, the paralleled inverters need to work in grid-connected mode and stand-alone transfer seamlessly between two modes. mode, control amount of power injected into grid. however, island voltage while output is dictated by load. This can be achieved using droop control. Inverters have different set points during but they all their adjusted according ratings. However, sudden unintentional islanding (due loss mains), transient flow from with high low points, which...
Extremely low frequency electromagnetic field (ELF EMF) pollution from overhead powerlines is known to cause biological effects across many phyla, but these are poorly understood. Honey bees important pollinators the globe and due their foraging flights exposed relatively high levels of ELF EMF in proximity powerlines. Here we ask how acute exposure 50 Hz EMFs at ranging 20-100 µT, found ground level below powerline conductors, 1000-7000 within 1 m affects honey bee olfactory learning,...
The purpose of the paper is to explore theory power factor in variable reluctance permanent magnet (VRPM) machines and understand what physical features these tend cause low value. A single figure merit, for a given design, identified that effectively determines best available working may be. same merit applicable synchronous conventional configuration, so comparison can be made between VRPM fundamental reasons their difference understood. scope improvement then examined, by changing...
A robust extended Kalman filter (EKF) is proposed as a method for estimation of the state charge (SOC) lithium-ion batteries used in hybrid electric vehicles (HEVs). An equivalent circuit model battery, including its electromotive force (EMF) hysteresis characteristics and polarization used. The effect EKF gain coefficient on SOC analyzed, an optimized determined to restrain battery terminal voltage from fluctuating. Experimental simulation results are presented. estimates using standard...
Battery charging is growing in importance as it has direct influence on battery performance and safety. This paper develops a generalized online estimation method for charge-polarization-voltage-based resistance-capacitance ( RC) circuit model to simulate the behavior of Li-ion batteries. The effects current, initial state charge (SOC), polarization state, aging voltage are quantitatively analyzed both time SOC domains. It demonstrated that nonlinearly related these impact factors. In...
The use of energy storage systems is inevitable in a power grid dominated by renewable generators. This paper presents performance overview 100 kW/270 kWh, grid-connected, hybrid battery system. system uses two types chemistries, li-ion and lead–acid connected directly at the DC bus — without electronic converters. After brief introduction short technical description project, three year, 2019 to 2021, operational data set. later split into individual charge/discharge cycles analyzed terms...
This paper presents a capacity planning framework for microgrid based on renewable energy sources and supported by hybrid battery storage system which is composed of three different types, including lithium-ion (Li-ion), lead acid (LA), second-life Li-ion batteries supplying electric vehicle (EV) charging stations. The objective this to determine the optimal size wind generation systems, PV systems (HBESS) with least cost. formulated as mixed integer linear programming (MILP) problem,...
The increasing amount of distributed generation (DG) in distribution networks (DNs) is giving rise to power quality and protection coordination problems. Issues like voltage regulation, flicker, harmonics loss between circuit breaker fuse need be addressed for integration DG into DN. This paper discusses these issues with a special emphasis on A typical DN modeled simulation results impact system are presented discussed here. Some solutions proposed cope
An effective introduction of distributed generation (DG) into existing distribution networks (DNs) calls for a review traditional power system protection concepts and strategies. New issues such as activeness DNs bidirectional flow require new solutions. This paper discusses challenges arising from the integration DG grid. It presents critically reviews state art Moreover, some alternate strategies are proposed their merits demerits discussed. (5 pages)
Dc‐link capacitor sizing is a critical aspect of inverter design. This study investigates for three‐level neutral‐point‐clamped and cascaded H‐bridge inverters, based on an analysis dc‐link current. Methods used to derive expressions the root‐mean‐square (rms) value harmonic spectrum current in two‐level are extended inverters. A new numerical approach also proposed calculating rms voltage ripple. MATLAB code given approach, which can be easily adapted different modulation strategies applied...