In order
to prove that the system proposed in this paper can be used generally, this paper describes the
simulation results obtained by using PSCAD/EMTDC: the relationship between the total harmonic
distortion (THD) of the output current and the output power of a DG, and the harmonic mitigation
ability of passive and active filters. Furthermore, the system is obliged to satisfy the regulations
made by Korea Electric Power Corporation (KEPCO). In the regulations, DG power factor needs
to be maintained between 0.9 and 1 in a grid-connected mode