Fuel cell based high frequency and soft switching DC-AC converter for remote area places

A conventional unregulated fuel cell system requires a multi-stage operation in order to get three phase AC power supply for integration with load or grid. The output of fuel cell which is DC has to be converted into high frequency AC which has low efficiency due to high switching losses. In this paper high frequency power is regulated with the help of cascade connection of the series resonant converter and single phase to three phase cycloconverter. A series resonant converter decreases the switching loss because of zero current switching whereas a single phase to three phase cycloconverter converts the single phase high frequency output into low frequency three phase output required by grid. The proposed high frequency converter has high conversion efficiency and low cost. It is compact due to reduction of number of stages and eliminates intermediate filter. Analysis and simulation are presented for complete converter system using Matlab software and it has been demonstrated that the system is highly efficient with simple controller and higher power density.