Smooth Control Strategy for Fuel Cell-Battery Power System

As the energy crisis and environmental problems are increasingly serious, fuel cell is adopted in many applications as green energy. In order to improve the dynamic performance of fuel cell, auxiliary power storage elements should be added. In our paper, the main power supply-fuel cell and auxiliary power supply-battery are in parallel to generate, which improve the performance of bus voltage. Firstly, the simulation models of the main and auxiliary power supply are set up. Then, a simple and feasible system control strategy is proposed for fuel cell discharging regulator and bus voltage regulator. Finally, a simulation platform is built up to verify that the control strategy proposed in this paper can realize smooth switching among different working modes and reasonable energy flow between the main and auxiliary power supply. Bus voltage has excellent steady-state and dynamic characteristics under all working conditions, which is suitable for the high-precision dc load.