Abstract: To ensure the operation stability and realize the cooperative optimal scheduling of the medium voltage DC distribution network,a cooperative optimal scheduling method based on power flow calculation is proposed in this paper.Through the power flow calculation model of the network,the power flow distribution is analyzed,and the output equalization index is determined to describe the network loss result. An active loss and line load balance objective function of the network in a single operation cycle is constructed, and constraints such as multiple constraints conditions are set. The multi-objective particle swarm optimization algorithm is used to solve the objective function and the equilibrium degree of variable parameters and the entire network are optimized at the same time to obtain the collaborative optimization scheduling results. The test results show that the cooperative optimization scheduling effect of the proposed method is satisfactory,and the voltage per-unit values are all lower than 1.00p.u. The fluctuation of voltage is within the expected standard range in the intra-day operation of each node;and the network losses are all lower than 0.047MW. In addition,peak clipping and valley filling can be realized to avoid voltage exceeding the limit.