Influence of voltage unbalance due to single phase distributed generators in the power distribution systems

This paper presents the influence of voltage unbalance caused bycurrent injection from single phase renewable energy distributed generators in the distributed power systems. This study explores the maximum allowable generation variance for dissimilar current mode inverters tied to three phase, four-wire power systemsand compares these values to the allowable voltage unbalance at the point of common coupling for a typical commercial load. The possible current injection cases are simulated using Matlab/Simulink. Uniquely, a circuit based simulation block is run in the m-file so that many different current injection cases can be simulated. Overall simulation procedures and analysis provide a good guideline for integration of small renewable distributed generations in low voltage distributed power systems.