电动汽车混合电源系统的自适应控制

Adaptive control of a hybrid power system in electric vehicles

在由双向电源变换器连接动力电池组和超级电容组形成的电动汽车混合电源系统中，实现了双向电源变换器的电源外特性设计，通过实时检测动力电池组的放电电流，实现了超级电容组的充放电状态和电流的自适应控制。建立了电源变换器外特性模型，描述了动力电池组放电电流和超级电容组充放电电流之间的定量关系。在此基础上，设计了双向电源变换器的控制电路。试验结果表明，在城市工况下，混合电源系统中动力电池组的峰值放电电流降低了60％，这有利于提高动力电池组的使用耐久性。

The external characteristics of the bi-directional power converter were designed for an electric vehicle＇ s hybrid power system in which an ultra-capacitor group is connected to a power battery group via the converter. Based on the measurement of the discharging current of the battery group, both of the working mode and the current of the ul- tra-capacitor were adaptively controlled. The model of the external characteristics of the hi-directional power con- verter was founded, revealing the quantitative relation between the battery current and the ultra-capacitor current. Then, the control circuit of the bi-directional power converter was developed. The results of the experiments showed that the peak current of the battery in this hybrid power system was 60% lower than that of the system current, which is advantageous to enhancing the battery life time.