Abstract
Traditional Uninterruptible Power Supplies (UPS) only provide stable power to critical loads in emergency situations, while Energy Storage Systems (ESS) perform functions such as generator output stabilization, frequency control, peak shaving, and load leveling. As the global ESS market expands, various ESS supply policies are being implemented in a number of countries. Accordingly, research and development of a hybrid UPS-ESS system combining the advantages of UPS and ESS are underway in order to ensure critical load stability in case of emergency. For such a situation, we propose the development of a system with a customer load management function by simply adding a converter and battery pack to a widely used conventional UPS. The proposed system in this paper is more economical than a hybrid UPS-ESS system or an ESS. In addition, the proposed system performs peak-clipping and load-shifting according to time-based rates, and has a longer power outage time in case of emergency without needing to communicate with the existing UPS.
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