A Nanogrid Photovoltaic Demonstration System by Using Innovation of Decentralized Group-Based Battery Energy Management (DBEM)

An inefficient charging issue of batteries in photovoltaic (PV) systems will greatly be diminished by the research project of a Nanogrid Photovoltaic Demonstration System by Using Innovation of Decentralized Group-Based Battery Energy Management. Researchers of the Green-Smart Energy Technology (G-SET) Research Unit of the Faculty of Engineering at Sriracha, Kasetsart University Sriracha Campus found that the inefficiency of battery charging and discharging processes in PV systems is the major obstacle in the design of a PV system that is capable of storing energy steadily throughout the year, even in rainy and cloudy days. This research project aims to design and build a nanogrid PV demonstration system by using an innovation of Decentralized group-based Battery Energy Management (DBEM). In addition, the DBEM project promotes practical usage as well as boosts further research and innovations. By disseminating the innovation of DBEM to the public, especially to researchers and investors in the power generation domain. DBEM is poised to assist the development of power systems in remote areas such as islands and mountains where wiring is hard to reach or clearly not possible. PV Nanogrid systems equipped with DBEM are the foundation of smart grid development in the near future. They can increase the energy efficiency and reliability of traditional stand-alone renewable energy systems, both grid-connected and non grid-connected.

The goals of DBEM innovation are four-fold: (1) to prolong the battery lifetime, (2) to minimize the loss of power supply, (3) to reduce the cost of energy, and (4) to reduce the wasted electrical energy. DBEM can be used in the development of microgrid and smart grid systems with mixing types of batteries in the same system. This makes operating and maintenance of the power grids become more flexible and economical.

For future work, we plan to enhance energy charing and discharging performance by integrating DBEM, a charger, and an inverter into a single system. This would lead not only to more flexible deployment, but also resulting in cheaper stand-alone PV-Battery systems. This system can potentially be a key component in a smart microgrid system.