纯电动车车用复合储能装置控制策略及参数优化

Control strategy and parameter optimization of hybrid energy storage device for electric vehicles

为解决目前纯电动车动力电池比功率不足的缺陷,对纯电动车的储能装置进行了研究。根据复合储能装置的特点和目的,制定了复合储能装置的工作模式,提出了基于速度与电流约束的模糊控制策略。为了进一步提高整车性能并降低蓄电池的输出电流,对复合储能装置的关键参数进行了线性优化,仿真结果表明:加装复合储能装置的纯电动车的加速时间缩短了12%,制动能量回收效率提高了39%,百公里耗电量减少了8.55%,并显著降低了蓄电池的输出电流,有效延长了蓄电池使用寿命和整车的续驶里程。

We studied the energy storage device of an electric vehicle for solving the low specific-power problem of its battery.Considering the characteristics and the control target of a hybrid energy storage device,we developed a five-operation mode,and proposed a fuzzy control strategy based on the vehicle speed and current constraints.To further improve the vehicle performance and reduce the output current of the battery,we applied linear optimization to the parameter design of the device.Simulation results show that the use of the hybrid energy storage device reduces the acceleration time of the electric vehicle by 12%,increases the braking energy recovery efficiency by 39%,and reduces the 100 km energy consumption by 8.55%.Moreover,it greatly decreases the output current of the battery,and thus benefits the cycle life of the battery and extends the driving range.