Research on the topology of DC distribution network and the influence of distributed generations access to the network

Recent years the research of DC power distribution network is getting more and more attention which mainly focus on the technical and economic analysis, power conversion technology, control and protection technology aspects. In this paper we calculate the DC distribution network line loss and the voltage unbalanced distribution by DC flow calculation analysis under different topologies. According to the simulation results of steady state power flow of DC power distribution network, we analysis the influence of the distributed generations and network structure on the voltage distribution and network loss. The results show that the structure of the DC distribution network directly affects the network loss and the unbalance of voltage distribution, and the mesh structure can improve the absorptive capacity of the distributed generations. Access points´ numbers and capacity of DGs can also influence both of network loss and unbalance voltage distribution.