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461	Soustavná elektrizace venkova na příkladu vybraných jihočeských obcí. / Systematic Electrification of the Countryside on the Example of South Bohemian Municipalities Týle, Prokop January 2022 (has links) This diploma thesis focuses on the systematic electrification - i.e. the production and distribution of electric power - in the era of the First Czechoslovak Republic. Based on several important acts and regulations, the author analyses and shortly introduces the development of the law system (connected with this phenomenon). He illustrates some fundamental aspects of the process of electrification, such as the financial participation of the state, the electric utility companies or the subsidization of the countryside electrification. As an example, the author then presents, the regional autonomy (nejsem si jistá, co tohle znamená, ale protože je to hodně specifikovaný, dala bych určitý člen) of Tábor in the South Bohemia District. Based on this, he aims to introduce the process of this long-term economic and social phenomenon in interwar Czechoslovakia. The author uses mainly historical administrative sources, published sources, and regional press, to show the development of electrification in the area with small rural municipalities and its agriculture-based economy. He furthermore puts the researched topic of the systematic electrification into the context of the wider region of the South Bohemia focusing on the activities of two leading south-bohemian electrotechnical companies: Jihočeské...
462	Control of transmission system power flows Kreikebaum, Frank Karl 13 January 2014 (has links) Power flow (PF) control can increase the utilization of the transmission system and connect lower cost generation with load. While PF controllers have demonstrated the ability to realize dynamic PF control for more than 25 years, PF control has been sparsely implemented. This research re-examines PF control in light of the recent development of fractionally-rated PF controllers and the incremental power flow (IPF) control concept. IPF control is the transfer of an incremental quantity of power from a specified source bus to specified destination bus along a specified path without influencing power flows on circuits outside of the path. The objectives of the research are to develop power system operation and planning methods compatible with IPF control, test the technical viability of IPF control, develop transmission planning frameworks leveraging PF and IPF control, develop power system operation and planning tools compatible with PF control, and quantify the impacts of PF and IPF control on multi-decade transmission planning. The results suggest that planning and operation of the power system are feasible with PF controllers and may lead to cost savings. The proposed planning frameworks may incent transmission investment and be compatible with the existing transmission planning process. If the results of the planning tool demonstration scale to the national level, the annual savings in electricity expenditures would be $13 billion per year (2010$). The proposed incremental packetized energy concept may facilitate a reduction in the environmental impact of energy consumption and lead to additional cost savings. Power flow control Transmission planning Power flow controller Controllable network transformer Distributed series reactance Fractionally-rated back-to-back Genetic algorithm Incremental power flow Merchant electrical pipeline Power purchase option Phase-shifting transformer Renewable portfolio standard Security-constrained optimal power flow Static synchronous series compensator Thyristor controlled series capacitor Optimal power flow CNT DSR CSCOPF FR-BTB GA IPF MEP PPO PSCOPF PST RPS SCOPF SSSC TCSC OPF Electric power distribution
463	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

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