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With increasing levels of distributed generation (DG) units in the power system, smart control systems have to be developed to obtain a reliable operation of the system. It is likely that this 'smart grid' will emerge from several small smart grids called microgrids. These microgrids are able to provide a coordinated integration of DG units in the electric power system. Integrating wind turbines as...
Data centers (DCs) are considered critical loads that require premium power from utilities to ensure reliability at all times. Microturbine (MT) generation systems are becoming important in DCs, not only as distributed generation (DG) for supplying electricity, but also for providing cooling and heating functions, which is known as combined cooling, heat and power (CCHP) or tri-generation. This paper...
A Microgrid is a devised grouping of loads, generation sources and energy storage interfaced through fast response power electronics to form a small scale power network. The paper discusses the complexities that could be faced by the existing Saudi Arabian Grid when Distributed Generation Resources are introduced to it. Considering a case of small microgrid and simulating a network similar to T and...
Growing depletion of natural resources and the Kyoto Protocol have aroused global attention to renewable energies. In Taiwan, the goal of real power generation from renewable energies is 4% of total generation in 2012 and 18% in 2020. Although renewable energies can mitigate the green gas effect, penetration of these distributed generations may change the operation scheme in the utility. One of the...
In this paper, loss of a dc microgrid system for residential complex is compared with loss in an ac system. Each system has a PV system, a gas engine cogeneration and 20 residential houses. The losses are calculated from measured load data and PV output data which was estimated from global solar radiation and temperature of a PV panel. The operation of the gas engine cogeneration is determined from...
DC microgrid is suitable for dc output type distributed generations and energy storages. In this paper, dc microgrid for residential houses is described. Electrical power through dc distribution line (?? 170 V) can be converted into some proper ac or dc voltages by converters placed near loads. Each house has a cogeneration system such as gas engine or fuel cell. The outputs of those distributed generations...
This paper describes a new control scheme of grid connected inverter of DG (distributed generation) under unbalanced grid voltage. In this paper, the proposed scheme of synchronous reference frame (SRF) controller can reduce the influence of unbalanced grid voltage, which is mainly caused by unbalanced distribution of single-phase and non-linear loads, etc. In order to realize the control goal, a...
This paper presents a modulation and controller design method for paralleled Z-source inverter systems applicable for alternative energy sources like solar cells, fuel cells, or variable-speed wind turbines with front-end diode rectifiers. A modulation scheme is designed based on simple shoot-through principle with interleaved carriers to give enhanced ripple reduction in the system. Subsequently,...
Recent R& D advances on megawatt power, high-frequency nanocrystalline transformer [1] and high-voltage, high-frequency SiC based semiconductor devices [2] present possibility of a shift in the design of high-power inverters from a one based on complicated structure with line-frequency switching to the one based on simple topology and operates at 10 - 20 kHz frequency. In line with these ongoing...
DC microgrid is a novel power system using dc distribution in order to provide a super high quality power. This system is suitable for dc output type distributed generations and energy storages. The dc power can be converted to the proper ac or dc voltages for the consumers by converters placed near loads, and these converters do not require transformers. This distributed scheme of load side converters...
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