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Journal of the Korean Institute of Illuminating and Electrical Installation Engineers

ISO Journal TitleJ Korean Inst. IIIum. Electr. Install. Eng.
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Title Development of LVDC/AC UPS Intergrated Power Conversion System with ESS Function
Authors Won-Il Lee ; Seung-Beom Lim ; Ji-Su Kim
DOI http://doi.org/10.5207/JIEIE.2023.37.5.076
Page pp.76-81
ISSN 1225-1135
Keywords ESS(Energe Storage System); LVDC(Low Valtage Direct Current); UPS(Uninterruptible Power Supply)
Abstract This paper introduces a UPS(Uninterruptible Power Supply) system that has an Energy Storage System(ESS) and can provide both LVDC(Low Voltage Direct Current) and AC outputs simultaneously. This system integrates an offline UPS, which is composed of bidirectional inverters and a battery converter, with an LVDC system consisting of a DC-DC converter. The LVDC system is designed to produce LVDC output by sharing the UPS's DC LINK, thus The LVDC system offers the advantage of compensating for power outages. Moreover, the proposed system has an ESS function that can distribute peak load through load leveling. The performance and functionality of the proposed system were validated through experiments in various scenarios, including normal operation, power outage situations, charging, and discharging.