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In this paper, we report on the results of controlling the state of charge (SOC) of batteries for back-up use by using weather forecasts in order to improve the self-consumption rate and store power for back-up. Regarding battery systems for utilizing variable renewable energy and back-up use, we suggest a method for charging and discharging batteries positively by changing the back-up capacity depending...
A numerical analysis of the minimum storage battery capacity required to achieve a certain energy self-consumption rate in a power distribution system that combines solar power generation and a storage battery shows that a DC supply can reduce the required storage battery capacity by about 10% relative to an AC supply by increasing the energy self-consumption rate.
Increasing the energy self-consumption rate is an important challenge for economic improvement in a grid parity environment. Here, the construction of a power supply system that combines solar power generation and a storage battery system is detailed and the increase in the renewable energy self-consumption rate obtained by optimizing the charging and discharging of the storage battery is reported.
The facility cost of the storage systems are a critical issue in the construction of micro grid, which is the core of the renewable energy. We propose the direct current mutual power interchange system as a way to reduce the storage battery capacity. This paper reports the outline of the proposed system and the verified result on the effect caused by electricity interchange upon the reduction of battery...
At the present time, the concept of coordination of photovoltaic generation systems with existing power systems has become the focus of increasing attention. Taking coordination between photovoltaic generation systems and power storage equipment as its theme, this paper elucidates the outlook for control conditions and the recovery of costs with the focus on economic performance and also reports on...
This paper reports the experimental study of a DC microgrid for an office building that is now being constructed in Obihiro City, Hokkaido, Japan. The objective of this study is to develop a self-sustained distributed energy system by combining distribution energies, batteries, and appliances with DC power. This new DC energy system not only reduces the environment load and improves energy efficiency...
A full digital short circuit protection method for advanced IGBTs has been proposed and experimentally demonstrated for the first time. The method employs combination of digital circuit, the gate charge sense instead of the conventional sense IGBT and analog circuit configuration. Digital protection scheme has significant advantages in the protection speed and flexibility.
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