Coordinated Control Technology for Multi-stack Fuel Cell System

At present, the output power of single fuel cell system is limited. Therefore, multiple fuel cell systems are connected in parallel to form a mutli-stack system, which can effectively improve the system power level, and is an important means for fuel cells to realize the application of heavy-duty transportation. Considering the power-efficiency characteristics of fuel cell system, how to improve the operation efficiency of the whole multi-stack system has become a hot issue. In this paper, a coordinated control method aiming at the highest instantaneous efficiency for multi-stack system is proposed. Firstly, the objective function is established and then the particle swarm optimization (PSO) algorithm is used for optimization calculation. Within the range of the total power demand, the optimal control sequences are obtained. According to the optimization result, the multi-stack coordinated control is applied to achieve highest instantaneous efficiency. Finally, a ground test verification platform of multi-stack fuel cell system is built to verify the effectiveness of the multi-stack coordinated control strategy.