Power Flow Calculation of Integrated Transmission and Distribution Networks

Abstract

As smart grids develop by leaps and bounds, the distribution network (DN) shows a more flexible and ever-changing trend. The continuous integration of distributed power generation, electric vehicles, and other new energy generation has led to an increasingly close relationship among the transmission and distribution networks (TDNs). The traditional method of independently calculating power flow in TDNs is no longer applicable. This paper proposes a power flow calculation algorithm for integrated transmission and distribution networks (ITDNs) based on the master-slave-splitting (MSS) method in response to this problem. This method is based on the electrical connection relationship between TDNs and the characteristics of their respective network structures. It decomposes the global power flow calculation problem into transmission network (TN) power flow calculation, multiple DN power flow calculation, and boundary node information coordination sub-problems. And achieve power flow calculation of ITDNs by exchanging the voltage and equivalent power of boundary nodes. Finally, the global power system constructed by the IEEE30 node system and IEEE33 node system is used to confirm the validity and correctness of the proposed algorithm and model.