National Metal and Materials Technology Center, 114 Thailand Science Park, Pathumthani, Thailand

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Abstract: Co-usages of Energy Storage System (ESS) with Solar Photovoltaics (PVs) are proved to provide beneficial results for both distribution and demand sides under proper design system. In this study, PV and ESS sizing are designed to serve industrial loads using Time-of-Use pricing. Our major goal is to lower the electric bill. In the meantime, the sharp load-rising present in daily load is another concern of power quality. The 1-min resolution annual loads of a building in Thailand are investigated and managed via designed control algorithm. The scenarios deploying PV-only and PV coupling with ESS are investigated in order to reduce the annual electric bill. Design selection criteria focus on the cost effectiveness and the ability to improve power quality. Reduction of up to 40% annual tariff could be achieved at the proposed sizing conditions of PV+ESS. The system offers approximately 8-years payback period, however suffers from energy losses. Attempts to change the algorithms for ESS operating schedule have relieved the loss with insignificant amounts. For reasonable saving and faster payback (4.5 years) with minimal energy loss, smaller size of PV is the immediate choice. The power quality requires further in-depth study of the load characteristics for better PV design and more-complicated ESS scenarios.

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