A Novel Harmonic Analysis Method of Active Distribution Network with Multiple Distributed Generation

Abstract

With the distributed generation (DG) penetration ratio increasing in power grid, the influence of DG on power grid become increasingly prominent. The distributed power supply mainly connected the power grid by power electronic devices and worked under high-frequency state, which generated harmonics into distribution network and reduced the power quality. As most active distribution network structure is consisted by multiple DGs, the harmonics generated by DGs may be superimposed or offset, which affected the power quality of active distribution network. In this paper, the equivalent circuit model of DG is established, and based on the model, a kind of active distributed network harmonic analysis method is also proposed, which can effectively analysis the harmonic character of active distributed network. The harmonic analysis result can also provide the reference for harmonic control.