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With increasing numbers of distributed generations (DGs) installed in distribution grids, the connection between transmission and distribution network becomes much stronger. Power flow calculation without consideration of transmission side may lead to inaccurate result, especially when penetration rate of DG are high. Thus a united power flow algorithm for transmission-distribution joint networks with DGs is put forward. Considering the electrical connection relationship and structural characteristics of these two grids, the whole system is firstly divided into transmission section and several distribution sections from boundary nodes. Appropriate power flow algorithm for each section is then chosen, and the interaction between transmission and distribution grids is also taken into account. The feasibility and effectiveness of this proposed method are testified by a transmission-distribution joint system with promising results.

United Power Flow Algorithm for Transmission-Distribution joint system with Distributed Generations