Harmonic Analysis of Grid Connected Power Electronic Systems in Low Voltage Distribution Networks The aim of this study is to analyze power quality of a low voltage distribution or a stand-alone network with different grid connected power converter topologies. Passive harmonic mitigation techniques are still attractive solutions in power converters. However, these solutions give different harmonic performances at a system level, where a large numbers of converter units are connected in parallel at a Point of Common Coupling (PCC). This is due to harmonic cancellation within parallel converter at the system level which depends on many different factors. Therefore, in this paper harmonic performance of a small grid system has been analyzed with respect to different grid and power electronicparameters. This paper has also elaborated the importance of phase angle values of current harmonics in order to analyze the power quality of a grid. Harmonic performances of different three-phase powerconverter topologies have been compared individually. The analysis at the system level has been further extended by including single-phase converters in parallel with the three-phase powerconverters. A comprehensive modellings and simulations have been carried out in SABER and Matlab/Simulink to verify the proposed analysis.