Hybridization and Control of Direct Methanol Fuel Cell Systems for Material Handling Applications

摘要

There are several advantages in replacing the lead-acid battery, such as faster refuelling and extended operating time. Because of the highly fluctuating load profile, the DMFC stack has to be hybridized. In this case an active series hybrid is the best solution. The dimensioning of the DMFC stack and the energy storage has to be done in the run-up according to the requirements of the load profile. Requirements for the energy storage are a high energy density and a high power density. Therefore only batteries come into consideration. For the hybrid system it is important to have a control strategy. The control strategy presented has two aims regarding aging of the fuel cell: avoiding of aging and identification of aging.