Fuzzy Logic Based Energy Management strategy for a Fuel Cell – Battery Hybrid System

摘要

Hybrid power systems with fuel cells and batteries have the potential to improve the operationefficiency and dynamic response. A proper load management strategy is important to bettersystem efficiency in hybrid systems. In this paper, a fuzzy logic algorithm has been used todetermine the fuel cell output power depending on the external required power and the batterystate of charge(SoC). If the required power of the hybrid system is small and the SoC is small,then the greater part of the fuel cell power is used to charge the battery pack. If the requiredpower is relatively big and the SoC is big, then the fuel cell and the battery are concurrentlyused to supply the required power. These IF-THEN operation rules are implemented by fuzzylogic for energy management.The strategy is evaluated using simulation and experimental results. The hybrid systemconsists of a fuel cell, a battery pack, a DC-DC converter and a DC-AC inverter. The resultsshow that fuzzy logic can be effectively used to optimize the operational efficiency of thehybrid system.