带可变参数锂离子电池Thevenin模型

Thevenin model of lithium-ion battery with variable parameters

高效的储能蓄电池对风储能系统非常关键,建立合理的电池模型对于研究电池的性能十分有意义。电池新一代汽车合作计划(PNGV)模型精确度高但是计算量大,Thevenin模型计算量小但精确度低。以18Ah的锂离子电池为研究对象,提出了一个改进的Thevenin等效电路模型,对模型中各参数值的确定方法作了修改。将模型中的参数设置为随着电池荷电状态(SOC)变化的量,采用恒流脉冲实验来确定改进后的模型参数,利用电力系统仿真软件(PSCAD)软件分别对常规和改进的Thevenin模型进行仿真。比较结果显示,相对于常规模型,改进模型具有计算量小、结果准确的特点,可为电池储能系统的仿真提供参考。

It is important for wind storage system to operate with an efficient energy storage battery. Thevenin model is contrary to PNGV model which has a high precision and large computing. An improved Thevenin equivalent circuit model was proposed, amending the determination method of parameters through taking 18 Ah lithium-ion battery as a research object. Constant current pulse experiment was adopted to determine the parameters of the improved model whose parameters were variable with the change of battery state, conventional and improved model was simulated based on PSCAD. The result shows the improved model has low computational complexity and accurate result compared with the conventional model. Therefore, it can provide a reference for the simulation of the battery energy storage system.