Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title A PCS Control Strategy for Hybrid ESS with Function of Emergency Power Supply
Authors Sang-Jin Kim ; Min-Ho Kwon ; Se-Wan Choi ; Seok-Min Paik ; Mi-Sung Kim
DOI 10.6113/TKPE/2016.21.4.302
Page pp.302-311
ISSN 1229-2214
Keywords Hybrid ESS; ESS(Energy Storage System); UPS(Uninterruptible Power Supply); Seamless transfer
Abstract This paper proposes a hybrid ESS that integrates an energy storage system (ESS) with an uninterruptible power supply (UPS). The hybrid ESS has a demand management and emergency power supply function while increasing the battery utilization of the UPS, which has just been used in a power failure. In addition to the critical load, the proposed system augments the capacity of emergency generation using an additional load, which has voltage and frequency-dependent characteristics to the grid side. The control algorithm of the AC-DC converter and bidirectional DC-DC converter is proposed for demand management and emergency power supply. Furthermore, seamless and autonomous transfer methods to alleviate the transient during mode transfer are proposed. To validate the proposed control scheme, experimental results from a 5 kW prototype are provided.