A Multi-stage Converter for Domestic Generation Systems Based on Fuel Cells

A new cost effective system for distributed power generation systems based on a fuel cell is proposed, designed and tested by means of a lab prototype. A review of different solutions to connect an energy buffer stage to the power source is firstly considered according to cost reduction criteria and efficiency maximization. Then, the 3kW generation system is sized according to a typical domestic daily load profile, while the energy storage elements are chosen in order to both compensate the fuel cell slow dynamic response and to supply the daily peak load energy demand. Finally, a suitable control technique able to cope with fuel cell and energy buffer dynamics, is implemented and the performance of the proposed system are evaluated by simulation and experimental results.