Integration of wind turbine, SOFC and microturbine in distributed generation

This paper reports the study of dynamic behaviour of an integrated distributed generation (DG) system comprising wind turbines (WTs), solid-oxide fuel cell (SOFC) and microturbine (MT) under variable loading profile. WTs coupled to permanent magnet generators (PMGs) are combined with the SOFC and the MT to meet the total load demand. The fluctuations in the output of the WTs due to wind speed variations are taken care of by the SOFC while the MT supplies the peak demand of the system. For MT, GAST (Gas Turbine) model coupled to PMG is used. An efficient dynamic model of SOFC has been developed which includes a controller for independent control of active power and inverter output voltage. Responses of the system to variable load demand and wind speed variations are presented with the analysis of the results.