In this paper, different control structures applied to distributed power generation system are discussed. Implementation of proportional-integral (PI), proportional-resonant (PR), hysteresis and dead beat controller in different reference frames is also treated. An evaluation in terms of current harmonic distortion when running in steady state condition is made. Additionally, the controllers' behavior in transient operation such as step in current reference and single phase fault in the utility grid has also been studied. Experimental results are presented for their evaluation