Research on Power Control Method of Fuel Cell UAV DC System with Constant Power Load

The negative impedance characteristics of the constant power load of fuel cell UAV will bring system stability problems. This paper carries out the analysis of large signal stability of fuel cell UAV DC microgrid system. The mixed potential function method is used to obtain the system stability boundary conditions, and the supercapacitor is used to improve the large signal stability domain of the system. In order to optimize the power of the control system, a rule-based energy management strategy is designed to derive the constraint relationship between the stability boundary condition of the system and the power optimization control. The simulation model and semi-physical experiments were designed, and the results showed that the system had good stability and power optimization control effect.