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In this paper, we describe a method of modeling the global solar irradiance on a clear sky. The proposed method is based on astrological phenomena, with which we can estimate the global solar irradiance of the few days, several months, and some years. To estimate the irradiance with high accuracy, it is necessary to calculate the solar radiation outside the Earth's atmosphere taking into account the...
We numerically estimated the inflow flux of terrestrial grass, which is the main floating macro-debris, into Tokyo Bay from April 2008 to March 2009 based on a two-way particle-tracking model and an inverse method applying a Lagrange multiplier. In the estimation, we used surface current velocities derived by high-frequency ocean radar and the quantity of grass collected by clean-up vessels which...
In medical facilities, studies of emergency measures against power failures due to natural disasters have become an interesting subject, especially those using renewable energy sources and energy-storage systems. We have developed a simulator to analyze the power grid conditions with several energy sources and batteries including commercial utility grid. For the sake of validation of the simulator,...
We have been developing a high-speed simulator and micro-grid emulator for real-time energy management system. In this paper, we describe our new fast simulation model for PV system that will allow us to simulate 24-hour data in less than 5 sec. We use this simulator to make estimations and verify our management strategies. We have proposed a hybrid DC/AC micro-grid system in our previous work. The...
This paper presents a simulation model of green energy devices, which is developed for analyzing energy balance of a micro-grid and for optimizing its management. Several renewable energy based electricity production and storage are modeled and analyzed in the making of strategies for sustainable micro-grid management. In this study, two different simulation models are described, which call a “long-term...
When a PC cluster is extended with new nodes, if a good scalability can keep is focused, especially in unbalanced-nodes PC cluster. In this paper, an experimental scalability evaluation of unbalanced- nodes PC cluster is illustrated. The results are also compared with that of balanced-nodes PC cluster. And, on the experiment results, the problems in parallel and distributed processing on unbalanced-nodes...
An experimental evaluation of unbalanced-nodes PC cluster shows a not good scalability. In this paper, the experiment results of evaluation on unbalanced-nodes PC cluster are shown and discussed. A dynamic approach of load balancing is proposed to improve scalability of unbalanced PC cluster.
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