Research on Distribution Network Loss Allocation with Small Hydropower Groups

On the basis of Longnan power grid with small hydropower groups, this paper proposes a loss allocation method combining marginal loss coefficient method and branch dissipation power transfer component method, aiming at the fact that marginal loss coefficient method does not consider the influence of balancing nodes and different balancing nodes on allocation results. Firstly, starting from the circuit law, Norton's equivalent is used to equivalent all power supplies to node injection current. Based on the branch dissipation power transfer component method, the network losses that each power supply node including the balancing node should share are obtained. Then, the marginal network loss coefficient method is used to obtain the network losses shared by other nodes except the balancing node. Finally, the calculation and analysis of the Longnan power grid with small hydropower are carried out, which verifies the feasibility of the proposed method and has reference value for the distribution of network losses of other distributed power grids.