基于小波变换的燃料电池汽车能量管理策略

Energy Management Strategy of Fuel Cell Vehicle Based on Wavelet Transform

以一款功率跟随型燃料电池轻型载货汽车为研究对象,结合典型工况下整车需求功率的频率特性,使用小波分析方法构建了一种基于小波变换的燃料电池汽车功率跟随能量管理策略:将小波变换后获取的车辆需求功率低频分量分配给燃料电池,改善燃料电池输出功率的波动;结合动力电池充放电能力与车辆功率需求,动态调整小波分解层数,自动调整功率跟随程度,保证整车动力需求。仿真结果表明,基于小波变换的功率跟随分配策略在典型工况下能够满足整车的动力性需求,维持动力电池荷电状态(SOC)在合理的范围内,燃料电池输出功率的波动度下降了29.8%,同时,整车百公里氢耗下降1.5%。

With a light truck equipped with power-following fuel cell as the research object,a power-following energy management strategy of a fuel cell based on wavelet transformation has been constructed combining the frequency characteristics of the vehicle power demand under typical driving cycles using wavelet analysis method.The low frequency component of the vehicle power demand obtained after wavelet transform was allocated to the fuel cell,so as to improve the fluctuation of the fuel cell output power.In addition,the wavelet decomposition level was dynamically adjusted to regulate the power following degree automatically,to ensure the power supply of the vehicle under various power battery charge-discharge capacity and vehicle power requirement.The simulation result shows that the power-following allocation strategy based on wavelet transform can meet the vehicle power demand under typical driving conditions,and the SOC can be kept in the reasonable range,the power output fluctuation of the fuel cell has been decreased by 29.8%,in addition,the hydrogen consumption has been reduced by 1.5%.