标题：Enhanced SOH Balancing Method of MMC Battery Energy Storage System with Cell Equalization Capability
作者：Ma, Zhan; Hao, Tianqu; Gao, Feng; Li, Nan; Gu, Xin
作者机构：[Ma, Zhan; Hao, Tianqu; Gao, Feng; Li, Nan; Gu, Xin] Shandong Univ, Sch Elect Engn, Jinan, Shandong, Peoples R China.
会议名称：33nd Annual IEEE Applied Power Electronics Conference and Exposition (APEC)
会议日期：MAR 04-08, 2018
来源：THIRTY-THIRD ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC 2018)
关键词：retired batteries; state-of-health; state-of-charge; modular multilevel; converter; sub-module; cell equalization
摘要：Using retired electric vehicle batteries in battery energy storage system (BESS) saves the cost but the state-of-health (SOH) of each battery is hard to be equal, which could significantly worsen the life time of whole battery system. When using the modular multilevel converter (MMC) to integrate the battery packs, it can achieve the SOH balancing among sub-modules (SMs). This paper further proposes an enhanced SOH balancing for MMC-BESS with cell equalization capability including traditional state-of-charge (SOC) equalization and SOH equalization to deal with the cell imbalance issue inside SM. Simulation and experimental results are presented to verify the performance of the proposed method.