电动汽车复合电源能量分配策略研究

Research on Energy Distribution Strategy for Hybrid Power System of Electric Vehicle

为实现复合电源能量的合理分配,提出了一种基于PID控制的能量分配策略,该方法通过监测超级电容电压,利用PID算法调节锂电池组的功率输出,从而间接实现复合电源的能量合理分配。在Advisor环境下对该策略进行仿真分析,结果表明,该策略能较好地发挥超级电容"削峰填谷"的作用,避免了大电流对锂电池组的冲击;同时,在汽车制动时可以较好地回收制动能量。通过与逻辑门限策略的对比表明,该策略具有参数易于调整,锂电池组的功率输出曲线更平滑等优点。

For rational power distribution of hybrid power system, a PID based energy distribution strategy was proposed. This strategy, by monitoring the voltage of supercapacitors, regulates the power output of Li-ion battery pack through PID algorithm, thereby realizes rational energy distribution of hybrid power indirectly. The strategy was simulated and analyzed in Advisor environment. The results show that the strategy proposed in this research can play a role of peak load shifting, avoid the impact of large current on Li-ion battery pack. in addition, braking energy can be recuperated. The comparison with logic threshold strategy shows that this strategy has advantages that parameters are easy to be regulated, and power output curve of＂ Li-ion battery pack is more smoothly.