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전력계통 주파수조정을 위한 SOC 기반의 배터리 에너지저장장치 제어전략
윤준영(Jun Yeong Yun),유가람(Garam Yu),국경수(Kyung Soo Kook),노도환(Do Hwan Rho),장병훈(Byung Hoon Chang) 대한전기학회 2014 전기학회논문지 Vol.63 No.5
This paper presents the SOC-based control strategy of BESS(Battery Energy Storage System) for providing power system frequency regulation in the bulk power systems. As the life cycle of BESS would be shortened by frequent changes of charge and discharge required for frequency regulation in a steady state, the proposed algorithm operates BESS within a range of SOC where its life cycle can be maximized. However, during a transient period of which occurrence frequency is low, BESS would be controlled to use its full capacity in a wider range of SOC. In addition, each output of multiple BESS is proportionally determined by its SOC so that the balance in SOC of multiple BESS can be managed. The effectiveness of the proposed control strategy is verified through various case studies employing a test system. Moreover, the control result of BESS with the measured frequency from a real system shows SOC of BESS can be maintained within a specific range although the frequency deviation is biased.