设施大棚履带电动拖拉机能量管理仿真研究

Study on the Energy Management Simulation of a Crawler Electric Tractor for Facility Greenhouse

针对单一能源电动拖拉机适应性差的问题,提出了一种基于超级电容辅能的双能源结构。结合电动拖拉机作业实际,对旋耕工况采用锂离子和超级电容协调供电模式,并设计了双能源逻辑门限控制规则。利用Matlab/Simulink建立仿真模型,并对单一能源和双能源2种模式下锂离子电池的荷电状态(SOC)、工作电流以及功率分配进行了仿真分析。仿真试验结果表明,在双能源控制模式下,遇到突变载荷工况时锂离子电池SOC下降变缓,锂离子电池输出更平滑,锂离子电池和超级电容共同提供突变载荷工况的功率,且超出基础功率部分由超级电容提供。锂离子电池免受突变电流的冲击,进而延长了锂离子电池的使用寿命,达到了预期控制目标。

Aiming at the poor adaptability of single-energy electric tractor,a dual-energy structure based on super capacitor auxiliary energy was proposed.Combined with the actual operation of the electric tractor studied,the coordinated power supply mode of lithium ion and super capacitor was adopted for the conditions of rotary tillage,and the dual-energy logic threshold control rule was designed.The simulation model was established by using Matlab/Simulink,and SOC,working current and power distribution of lithium ion battery were simulated under single energy and dual energy modes.The simulation results showed that,under the dual-energy control mode,SOC of lithium-ion battery decreased slowly and the output of lithium-ion battery was smoother when encountering abrupt load conditions.The lithium-ion battery and supercapacitor jointly provided the power under the abrupt load conditions,and the excess power was provided by supercapacitor.In this way,the lithium ion battery was protected from the impact of abrupt current,thus prolonged the service life of the lithium ion battery and achieved the expected control goal.