Abstract: The paper has modeled electric power distribution networks with connected distributed generation under condition of background harmonics of the network or generated harmonics from the DG itself. Effect factors on hosting capacity of DG were also analyzed to show the maximum and minimum level of generation in case of a radial network. Under harmonic distorted conditions where harmonics were generated from DG or propagated from background harmonics, the effects of these harmonics are different. They cause reducing in generated power of DG into the network differently for different cases. Even if harmonic distorted level is not over the regulated limit, the generation power of DG should to be controlled to avoid voltage from exceeding the available limit. The results from this paper are directional in operating and dispatching electric distribution networks, and proposing method to eliminate harmonic and its effects.

Keywords: Hosting capacity, Distributed Generation, Harmonic, Distribution Networks.