Microgrid is a new concept in power generation. The Microgrid concept assumes a cluster of loads and micro sources operating as a single controllable system that provides both power and heat to its local area. Not much is known about Microgrid behavior as a whole system. Some models exist which describe the components of a Microgrid. In this paper, model of Microgrids with steady state and their transient responses to changing inputs are presented. Current models of a fuel cell, microturbines, wind turbine and solar cell have been discussed. Finally a complete model built of Microgrid including the power sources, their power electronics, and a load and mains model in MATLAB/Simulink is presented.
This paper investigated the current, flux and instantaneous power signals as a diagnostic medium to detect the eccentricity faults under varying load conditions using eccentricity fault frequency components. The analysis of results based on the variations in the amplitude of sideband components between healthy and faulty motors versus average eccentricity level over a wide range of loading conditions from different signals. This study examine the usefulness of instantaneous power to detect the eccentricity faults under varying loading conditions and also shows the prime features of different signals to detect the eccentricity faults using the variations between the healthy and faulty motors when the level of average eccentricity is high and the rated load is light. Overall, this paper provides comprehensive detail to detect the eccentricity faults using current, axial flux and instantaneous power signals simultaneously.
In this paper, Nanogrid System and working is presented for the future sustainable power system. This system is for small scale for smart homes with decentralized power system. A Nanogrid is the combination of energy system such as using of sources such as solar cells, fuel cells, micro turbines, wind turbines, energy storage devices and AC, DC power systems and controllable loads. This grid may use single mode or island mode with soft switching. The Dynamic of power system capability increases reliability, in case if one system fails it switch to other system to continue proving electric power with losing quality. The energy storage system is used to maintain stability during transition between the operating modes is emphasized. The Simulink model is used to present the working of system.
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