锂离子电池储能系统建模与控制策略研究

Li-Ion Battery Energy Storage System Modeling and Control Strategy

研究了含DC/DC变换器的锂离子电池系统的充放电特性。以锂离子电池等效电路为基础,提出了电池侧电感平均电流内环控制及恒功率、恒电流和恒电压切换的外环控制DC/DC双闭环策略。以锂离子电池当前荷电状态和充放电指令为输入条件,建立模糊控制模块,基于模糊理论对其充放电进行自适应安全控制。仿真结果表明所建立锂离子模型及控制策略正确性有效性。

This paper presents a study on the chargedischarge characteristics of the Lithium-ion battery(Li-Ion)energy storage system containing the DC/DC converter. Based on modeling of Li-Ion equivalent circuit,this paper proposes a double closed loop strategy of the DC/DC converter where the inner loop is the average current control on Li-Ion side induc-tance and the outer loop is the switch control by the constant active power,the constant current and the voltage. Then,with the Li-Ion current state of charge(SOC) and discharge ins-tructions as the input conditions,a Fuzzy Control Module is set up to control its charge/discharge adaptive. The simulation results have proved correctness and effectiveness of the control strategy for the Lithium-ion battery.