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Energies 2018, 11(4), 873; https://doi.org/10.3390/en11040873

State-of-Charge Balancing Control of a Modular Multilevel Converter with an Integrated Battery Energy Storage

1
National Active Distribution Network Technology Research Center (NANTEC), Beijing Jiaotong University, Beijing 100044, China
2
Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing Jiaotong University, Beijing 100044, China
3
Huawei Technologies Co., Ltd, Shenzhen 518000, China
4
CRRC Industrial Institute Co., Ltd., Beijing 100071, China
*
Author to whom correspondence should be addressed.
Received: 5 March 2018 / Revised: 1 April 2018 / Accepted: 4 April 2018 / Published: 9 April 2018
(This article belongs to the Special Issue Power Electronics in Renewable Energy Systems)
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Abstract

With the fast development of the electric vehicle industry, the reuse of second-life batteries in vehicles are becoming more attractive, however, both the state-of-charge (SOC) inconsistency and the capacity inconsistency of second-life batteries have limits in their utilization. This paper focuses on the second-life batteries applied battery energy storage system (BESS) based on modular multilevel converter (MMC). By analyzing the power flow characteristics among all sources within the MMC-BESS, a three-level SOC equilibrium control strategy aiming to battery capacity inconsistency is proposed to balance the energy of batteries, which includes SOC balance among three-phase legs, SOC balance between the upper and lower arms of each phase, and SOC balance of submodules within each arm. In battery charging and discharging control, by introducing power regulations based on battery capacity proportion of three-phase legs, capacity deviation between the upper and lower’s arm, and the capacity coefficient of the submodule into the SOC feedback control loop, SOC balance of all battery modules is accomplished, thus effectively improving the energy utilization of second-life battery energy storage system. Finally, the effectiveness and feasibility of the proposed methods are verified by results obtained from simulations and the experimental platform. View Full-Text
Keywords: modular multilevel converter; battery energy storage system; state-of-charge balancing; second-life battery modular multilevel converter; battery energy storage system; state-of-charge balancing; second-life battery
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Liang, H.; Guo, L.; Song, J.; Yang, Y.; Zhang, W.; Qi, H. State-of-Charge Balancing Control of a Modular Multilevel Converter with an Integrated Battery Energy Storage. Energies 2018, 11, 873.

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