Power management for hybrid fuel cell system

This paper proposes a power management control scheme for hybrid fuel cell power system. The hybrid fuel cell system consists of a fuel cell, an isolated unidirectional converter, a bi-directional converter, an inverter, and a battery. The fuel cell powers the steady state energy and the battery compensates the dynamic energy. They need to work together to ensure the system operates with high efficiency and behaviors good dynamic performance. Therefore, the power management should be employed. The goal of the power management control scheme is to control the bi-directional converter operates under buck, boost or shut-down mode according to the condition of fuel cell and battery, so that the battery can compensate the dynamic energy. A 1 kW fuel cell power system was built in the lab. Experimental results are shown to verify the theoretical analysis.