A Linearized Optimal Power Flow Framework for a Balanced Active Distribution Network

The distribution system is experiencing a paradigm shift in its operation with the integration of distributed energy resources (DERs). The integration of DERs is increasing at a rapid pace due to the increasing energy demand and carbon footprint. Therefore, the role of the distribution network operator is also getting crucial for the overall distribution grid operation. Active operation of the distribution network is need of the hour which can be accomplished by performing the optimal power flow (OPF) calculations. In this paper, a linearized OPF formulation is proposed for a balanced distribution system to schedule the DERs in the light of network constraints. The nonlinear power flow equations are appropriately linearized for the proposed OPF formulation. The losses in the distribution lines are incorporated through an iterative process. The accuracy and performance of proposed OPF formulation is examined on IEEE 33-bus radial, 69-bus radial, and 69-bus weakly meshed networks.