燃料电池/超级电容器混合发电系统能量管理策略

Energy management strategy for hybrid generation system with fuel cell and super-capacitor

给出由燃料电池和超级电容器构成的混合发电系统的能量管理策略。在拓扑分析的基础上,制定了双向、单向DC/DC变换器的控制策略。在微分平滑理论的基础上,给出了基于超级电容器电流的直流母线电容能量动态轨迹规划方案,在实现负载快速跟踪的同时,缓解了超级电容器的暂态大电流状况。提出了燃料电池输出功率的模糊控制律,充分考虑燃料电池与超级电容器的工作状态,调节燃料电池出力,在保证负载正常供给的前提下,维持超级电容器储能为给定值。引入了超级电容器及燃料电池电流饱和方程,确保发电系统安全运行及其使用寿命。仿真分析验证了该能量管理策略的正确性,还展示了该发电系统对负载功率的调节作用。

An energy management strategy for hybrid generation system with fuel cell and super-capacitor is presented. The control strategy of bidirectional and unidirectional DC/DC converters is designed based on the topology analysis. According to the differential flatness theory,the way to plan the dynamic trajectory of DC-bus capacitor energy based on the super-capacitor current is explained,which realizes the fast load following while alleviates the transient current of super-capacitor. The fuzzy control law of fuel cell is proposed,according to the working conditions of both fuel cell and super-capacitor,which adjusts the output of fuel cell to meet the load demand while maintains the reference energy storage of super-capacitor. The current saturation equations of super-capacitor and fuel cell are introduced to ensure the safe operation and lifetime of generation system. Simulative analysis strategy and shows the load power regulation by verifies the correctness of the proposed energy management generation system.