基于优化的Thevenin模型的镍氢电池仿真

摘要

针对镍氢动力电池开路电压的动态滞回特性,在Thevenin仿真模型的基础上对开路电压的选取进行优化,仿真模型主要优化开路电压与历史充放电方向的关系.对镍氢电池进行混合脉冲功率特性测试(HPPC),用递推最小二乘法对模型参数进行系统辨识,用Simulink搭建电池Thevenin经典模型及优化模型,用变电流对模型进行仿真分析.仿真结果表明:优化模型输出平均电压误差10 mV,对于电动汽车的实际工况而言,优化模型更能体现电池特性.%The selection of the open circuit voltage was optimized based on Thevenin model,for the dynamic hystersis characteristics of Ni-MH power battery open circuit voltage.The relationship between open circuit voltage and the historical direction of charging or discharging was optimized on simulation model.Hybrid pulse power characterization test was done on Ni-MH power battery,and RLS was used for model parameter identification.Simulink was used to build classical Thevenin model and the optimized model,and then simulation was done with a input of variable current on the model.The simulation results were shown that the error of average output voltage was 10 mV.For the actual condition of EV,the characteristics of the battery were reflected better by optimized model.