Harmonic power flow analysis for distribution system with distributed generations

As distributed generations (DGs) are mostly connected to the distribution system via converters, and this causes interaction with the grid, harmonic distribution gets impacted. An output-impendence model for grid-connected inverter of DG is introduced, and output-impedance model based backward/forward sweep harmonic power-flow algorithm for distribution system with DGs is proposed. The algorithm can consider the interaction between DGs and the grid, and take the influence factors such as DG location and background harmonic pollution into account. The proposed method is tested on the typical 33-node distribution system, and the system harmonic distribution is calculated.