纯电动汽车蓄电池-超级电容复合能源系统研究

Research on battery-supercapcitor hybrid energy system for pure electric vehicle

为弥补现有纯电动汽车单一能源的不足,采用蓄电池为主超级电容为辅的复合能源系统,通过对车辆动力性、续驶里程、制动能量回收等约束的分析,对复合能源进行参数匹配;考虑超级电容电压与其容量和效率的关系,将超级电容电压、蓄电池SOC和车辆需求功率作为输入量制定模糊控制策略;为避免一次行驶路况结论的片面性,在UDDS路况进行多次循环仿真直至蓄电池放电结束。结果表明,所采用的蓄电池——超级电容复合能源系统参数匹配方法和模糊控制策略能够很好的满足纯电动汽车在完整放电行驶中对能源系统能量和功率的需求,能够有效回收利用再生制动能量,提高能源系统效率,提高车辆动力性能和经济性能,起到延长蓄电池使用寿命的作用。

In order to make up for the lack of a single energy source for existing electric vehicles,using battery and supercapcitor hybrid energy system,in which the battery as main energy source,supercapcitor as auxiliary energy source,optimized its parameters through vehicle dynamic performance,driving range,braking energy recovery and other constraints.Considering relationship between supercapcitor voltage and its capacity and efficiency,formulated fuzzy control strategy based on supercapcitor voltage,battery SOC and vehicle power requirements.In order to avoid the incompleteness of the single cycle simulation conclusion,multiple cycles of simulation are performed in the UDDS road condition until the battery discharge end.The results show that the parameter matching method and fuzzy logic control strategy of battery supercapcitor hybrid energy system can meet the demand for energy and power of pure electric vehicle during complete discharge running cycle,effectively recycle and utilize regenerative braking energy,improve energy system efficiency,improve vehicle power performance and economic performance,which plays a role in extending battery life.