Optimal Active and Reactive Power Coordinated Dispatch in Unbalanced Distribution Networks

The increasing penetration of distributed generations (DGs) has brought huge challenges to distribution networks operation, such as reverse power flow and overvoltage. Under this background, an optimal active and reactive power dispatch (OARPD) method is proposed in this paper. Considering the three-phase unbalance property, the bus injected model (BIM) of power flow is established while a novel high precision linearized method is proposed. Based on the linearized power flow model, the multi-objective OARPD model which aims to minimize networks losses while maximize the absorption of renewable energy is constructed. Moreover, to ensure the system safe operation and ameliorate the adverse effects caused by single-phase integration of DG, a novel voltage unbalance constraint is established. Finally, examples have been used to demonstrate the validity and effectiveness of the proposed method.