Abstract: Aiming at the problems of increased network loss and node voltage deviation of the traditional

distribution network after the distributed generations（DGs）is connected to the network，an optimization strategy

that takes into account the reactive power output of DGs grid-connected inverter was proposed. Firstly，the reactive

power optimization model of the distribution network with the DGs was established，and then the power flow

distribution of the distribution network was calculated based on the power flow algorithm of the previous generation.Then the improved bat optimization algorithm was used to solve the model，which effectively avoids the solution falling into the local optimal solution，and optimal reactive power output of the DGs grid-connected inverter was obtained. Finally，the IEEE-33 node distribution network model with the DGs was built through Matlab to conduct simulation experiments. The results certificate the effectiveness and feasibility of the designed reactive power optimization strategy.

      Key words: distributed generations（DGs）；voltage deviation；network loss；previous generation pushback；

improved bat algorithm；reactive power optimization