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411	PV Based Converter with Integrated Battery Charger for DC Micro-Grid Applications Salve, Rima January 2014 (has links) Indiana University-Purdue University Indianapolis (IUPUI) / This thesis presents a converter topology for photovoltaic panels. This topology minimizes the number of switching devices used, thereby reducing power losses that arise from high frequency switching operations. The control strategy is implemented using a simple micro-controller that implements the proportional plus integral control. All the control loops are closed feedback loops hence minimizing error instantaneously and adjusting efficiently to system variations. The energy management between three components, namely, the photovoltaic panel, a battery and a DC link for a microgrid, is shown distributed over three modes. These modes are dependent on the irradiance from the sunlight. All three modes are simulated. The maximum power point tracking of the system plays a crucial role in this configuration, as it is one of the main challenges tackled by the control system. Various methods of MPPT are discussed, and the Perturb and Observe method is employed and is described in detail. Experimental results are shown for the maximum power point tracking of this system with a scaled down version of the panel's actual capability. photovoltaic power mppt converter energy microgrid perturb and observe electronics dc dc converter bidirectional Electric current converters -- Research DC-to-DC converters Electric switchgear Electric power distribution Electric power systems -- Control Photovoltaic power generation Microelectronics -- Power supply Microtechnology -- Research Solar cells -- Research Voltage-frequency converters Distributed generation of electric power Electric vehicles -- Power supply Battery chargers Feedback (Electronics) Switching circuits Electronics -- Materials Renewable energy sources
412	A non-conventional multilevel flying-capacitor converter topology Gulpinar, Feyzullah January 2014 (has links) Indiana University-Purdue University Indianapolis (IUPUI) / This research proposes state-of-the-art multilevel converter topologies and their modulation strategies, the implementation of a conventional flying-capacitor converter topology up to four-level, and a new four-level flying-capacitor H-Bridge converter confi guration. The three phase version of this proposed four-level flying-capacitor H-Bridge converter is given as well in this study. The highlighted advantages of the proposed converter are as following: (1) the same blocking voltage for all switches employed in the con figuration, (2) no capacitor midpoint connection is needed, (3) reduced number of passive elements as compared to the conventional solution, (4) reduced total dc source value by comparison with the conventional topology. The proposed four-level capacitor-clamped H-Bridge converter can be utilized as a multilevel inverter application in an electri fied railway system, or in hybrid electric vehicles. In addition to the implementation of the proposed topology in this research, its experimental setup has been designed to validate the simulation results of the given converter topologies. Flying-Capacitor Converter Topology Capacitor-Clamped Converter Topology Multilevel Converter Topologies Non-Conventional Converter Topology Power electronics -- Research Switching circuits Redundancy (Engineering) Capacitors -- Research Switched capacitor circuits Passive components PWM power converters Electric motors -- Electronic control Switching theory Electric circuits -- Alternating current Electric driving -- Research

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PV Based Converter with Integrated Battery Charger for DC Micro-Grid Applications

A non-conventional multilevel flying-capacitor converter topology