双能源电动拖拉机能量管理策略

Energy management strategy of double energy electric tractor

针对单一能源电动拖拉机无法适应田间复杂作业工况的问题,提出一种基于锂离子电池和超级电容的双电源电动拖拉机。结合拖拉机作业实际,对负荷和能耗相对较重的犁耕作业工况采用双能源供电模式,双能源之间的功率分配采用模糊控制策略。结果表明,与采用单一能源相比,对双电源采用能量管理控制后,双电源输出的功率之和能够很好的满足电机功率需求,锂离子电池的平均工作电流和峰值工作电流下降幅度分别达到67.9%和58.7%,一次充满电后连续作业时间延长约9.17倍。因此,采用双电源结构和合理的能量管理控制策略,拖拉机一次充电连续作业时间得到延长的同时,锂离子电池的寿命也得到延长。

In order to solve the problem that a single energy electric tractor cannot adapt to the complex working conditions in the field,a dual power electric tractor based on lithium-ion battery and supercapacitor was proposed.Consider the real-life operation conditions of the tractor,the double energy power supply mode was adopted for ploughing operation conditions with relatively heavy load and energy consumption,and the fuzzy control strategy was used for the energy distribution between the two power sources in plowing conditions.The simulation comparison was carried out by using single energy and dual-energy.The results show that,compared with the single energy source,the sum of the output power of the dual power supply can meet the power demand of the motor,the average and peak operating current of the lithium-ion battery decreased by 67.9%and 58.7%,respectively,and the uninterrupted working time was extended about 9.17 times after a full charge.Therefore,with the dual power supply structure and reasonable energy management control strategy,the uninterrupted working time of the tractor with one full charge was extended.The life of the lithium-ion battery was also extended.