电动汽车混合储能系统能效优化策略设计

Design of Energy Efficiency Optimization Strategy for Hybrid Energy SStorage System in Electric Vehicle

为了提高电动汽车混合储能系统(HESS)工作期间的能效,此处提出了一种基于多目标能效优化的能量管理策略。通过结合HESS功率损耗和蓄电池电流、荷电状态(SOC)建立多目标优化函数,利用系统状态参数制定约束条件,实时求解HESS最优功率分配比。在实验平台分别测试了两种能量管理策略,经US06,NEDC和WLTP汽车驾驶工况验证,所提出的策略相较基于规则的能量管理策略可以将HESS能量利用率分别提高2.2%,3.23%和4.45%,同时有效提高了蓄电池的续航能力,并降低了蓄电池电流峰值。

To improve the energy efficiency of the hybrid energy storage system(HESS)during the operation of electric vehicles,a multi-objective energy efficiency optimization-based energy management strategy is proposed.By combining the power loss of the HESS with the battery current and state of charge(SOC),a multi-objective optimization function is established.System state parameters are used to formulate constraint conditions and real-time solutions are obtained for the optimal power distribution ratio of the HESS.Two energy management strategies are tested on the experimental platform and verified under the USO6,NEDC and WLTP driving cycles.The proposed strategy,compared to the rule-based energy management strategy,can increase the energy utilization rate of the HESS by 2.2%,3.23%and 4.45%respectively.Furthermore,it effectively enhances the battery life while reducing the peak current of the battery.