Research On Power Allocation And Capacity Allocation Optimization Of Hydrogen-electric Hybrid Power System

Proton exchange membrane fuel cell is a new type of hydrogen fueled power generation equipment,which has many advantages,such as clean,high efficiency,wide range of voltage operation,etc.,and is widely used in transportation field.The hydrogenelectric hybrid system combines the fuel cell with the auxiliary power supply,which not only improves the endurance of the system,but also solves the problem of mismatch between the output characteristics of the fuel cell and the load characteristics,which has become a current research hotspot.In the hydrogen-electric hybrid power system,the capacity ratio of fuel cell and battery and the power coordination control strategy have a crucial impact on the overall performance and economy of the system.This thesis focuses on the research for hydrogen-electric hybrid power system.The main research contents are as follows:1.Taking the hydrogen-electric hybrid bus as the specific researching object,the model of hydrogen-electric hybrid power system is established with the typical topology of hydrogen-electric hybrid power system.Aiming at the problem that the evaluation indicators of the hydrogen-electric hybrid power system are diverse and lack uniformity,a comprehensive evaluation index of the system operating cost is established by comprehensively considering the hydrogen consumption of the system,the lifetime of the fuel cell,and the lifetime of the battery.2.Three power coordination control strategies are designed and compared.Aiming at the practical application object of this thesis,considering the load changing capability of the fuel cell,the power coordination control strategy based on SOC state and the power coordination control strategy based on real-time wavelet frequency division are designed.In order to further improve the system economy,considering the system hydrogen consumption,fuel cell and battery consumption,an optimized power coordination control strategy based on particle swarm algorithm is proposed.In the strategy,a penalty function based on the SOC of the power battery is mainly designed,which can effectively control the SOC of battery under the premise of satisfying the optimal cost.The simulation results show that,under the three strategies,the power coordination control strategy based on particle swarm algorithm has the lowest percentage of fuel cell lifetime attenuation and the best comprehensive evaluation index.3.A capacity allocation optimization method based on particle swarm optimization is designed.Taking the comprehensive evaluation index as the optimization goal,the particle swarm algorithm is used to optimize the system capacity configuration,and the system performance and comprehensive operation index under different capacity configurations are compared and analyzed.The results show that the unreasonable capacity configuration will accelerate the lifetime decline of fuel cells and battery,resulting in increased operating costs.Under the optimized capacity configuration,the system has the lowest operating cost,and its comprehensive evaluation index is the best.