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Performance evaluation of grid-connected power conversion systems integrated with real-time battery monitoring in a battery energy storage system

机译：电池储能系统实时电池监控集成的网格连接电力转换系统的性能评估

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摘要

This paper aims at investigating power conversion system (PCS) and lithium-ion (Li-ion) cells employed in a grid-connected battery energy storage system (BESS). For PCS, the work evaluates the efficiency performance among the four topologies commonly used in power grid using PSIM. The output power, DC link voltage, semiconductor devices' configurations and pulse width modulation method are the four parameters which are set constant in order to obtain a fair comparison among the topologies. From the simulations, it was observed that direct DC-AC inverters (98.3-99.1%) yield better efficiency performance compared to conventional DC-AC inverters (98.1-99.0%). Besides, a Li-ion cell is monitored during its charge and discharge cycles where state of charge is estimated via the combination of Coulomb counting and open-circuit voltage method. State of health is predicted by measuring the battery capacity in an experimental setup which aims to predict battery remaining useful life, hence improving the reliability of a BESS.
机译：本文旨在调查在网格连接的电池储能系统（BESS）中采用的电力转换系统（PC）和锂离子（Li离子）电池。对于PC，工作评估使用PSIM在电网中常用的四种拓扑之间的效率性能。输出功率，直流链路电压，半导体器件的配置和脉冲宽度调制方法是设置常数的四个参数，以便在拓扑中获得公平的比较。从模拟中，观察到直接DC-AC逆变器（98.3-99.1％）与传统的DC-AC逆变器相比，产生更好的效率性能（98.1-99.0％）。此外，在其充电和放电循环期间监测锂离子电池，其中通过库仑计数和开路电压方法的组合估计充电状态。通过测量实验设置中的电池容量来预测健康状况，旨在预测电池剩余的使用寿命，因此提高了贝塞的可靠性。

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