KEYWORDS: Solar radiation, Data modeling, Solar energy, Solar radiation models, Statistical analysis, Error analysis, Renewable energy, Computer engineering
This paper discusses the probability distribution functions (PDF) of monthly insolation for four locations in Libya based on analysis of 30 years of historical weather data calculated by National Renewable Energy Laboratory (NREL), in order to get appropriate probability distribution that best fits the data for a given month of the year. The frequency distributions used for solar irradiation data include Weibull, Normal, Lognormal and Gamma. The observed radiation at four locations in Libya on a monthly basis are analyzed to evaluate the suitability of the probability distribution functions based on the mean square errors. The analysis showed all the probability functions are appropriate for all the locations where weather conditions are relatively steady throughout the year. From the analysis it is concluded that Normal and Weibull distributions gives the best fit for observed solar radiation.
The objective of this paper is to design and simulate an isolated bidirectional DC/DC converter, which has been recently incorporated in a Fuel Cell Electric Vehicles (FCEV), to interface a battery with the (FCEV) system. In the (FCEV) with an energy storage such as a battery. The fuel cell is the principal source providing the most power required by the traction motor. The battery, as an additional source, assists the fuel cell to fed the traction motor because of the slow dynamics of the fuel cell system and it can store also the energy during braking phases, in this case the use of bidirectional DC/DC converter is necessary to manage the power flux between the battery and the other parts of the system. Moreover, wide band-gap devices (WBG) have been considered due to their obvious advantages and their superior characteristics in various aspects that lead to better operating performance.
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