Browsing by Author "Bati, Akram F."

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    The Modelling, Simulation and Control of a 50 kW Vertical Axis Wind Turbine
    (2012-09-13T00:00:00Z) Bati, Akram F.; Brennan, Feargal P.
    This paper presents the modelling, Simulation and control of the APP 50 kW vertical axis wind turbine generating unit which is designed and built by Cranfield University, Department of Offshore, Process & Energy Engineering. Because of the increasing interest of Power Distribution companies to connect medium sized wind turbines to reinforce the Low Carbon future 11 kV networks, unit exploration and investigation will add valuable insight into operation scenarios and their effects on the local network. The main objectives of this work are to model all elements, verify the design figures-, analyse the operational aspects of the drive-train and improve the quality of the generated power with respect to the converter, harmonic filter and controller.
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    Wireless Power Transfer Using Class E Inverter With Saturable DC-Feed Inductor
    (IEEE Institute of Electrical and Electronics, 2014-07-31T00:00:00Z) Aldhaher, Samer; Luk, Patrick Chi-Kwong; Bati, Akram F.
    Resonant converters used as coil drivers in inductive links generally operate efficiently at optimum switching conditions for constant load values and ranges. Changes in load and range can shift the operation of the coil driver to a non-optimum switching state which results in higher switching losses and reduced output power levels. This paper presents a method to adapt to variations in range for a Class E inverter used as a coil driver in a wireless power transfer (WPT) system based on inductive coupling. It is shown that by controlling the duty cycle of the inverter’s switch and the value of its DC-feed inductance, the Class E inverter can be tuned to operate at optimum switching conditions as the distance between the coils of the WPT system changes. Mathematical analysis is presented based on a linear piecewise state-space representation of the inverter and the inductive link. Extensive experimental results are presented to verify the performed analysis and validity of the proposed tuning procedure.