A Power Flow Optimization Method for Distributed Energy Access to DC Distribution GridA Power Flow Optimization Method for Distributed Energy Access to DC Distribution GridA Power Flow Optimization Method for Distributed Energy Access to DC Distribution G

摘要

The optimization power flow is critical to efficient use of the distributed energy access to DC distribution grid. In order to optimize the power flow of DC distribution through the upper level control, by considering the factors of distributed energy permeability and DC grid topology, one OPF mathematical model of DC distribution network is established taking the indexes of network loss and voltage imbalance degree as objective functions. Without hardware investment increase nor using complex algorithm, from the perspective of the energy management, the real-time power flow optimization of DC distribution grid is realized by real-timely controlling instruction values of each AC/DC、DC/DC converters. Two cases of the distributed energy access to IEEE 16 nodes radial distribution network and meshed distribution network are demonstrated. Indexes of the network loss and voltage imbalance degrees of DC distribution network are compared before and after the optimization by simulation of PSCAD/EMTDC, and the feasibility of the proposed method is verified. The study can provide some theoretical support to reduce the DC distribution network with distributed energy loss.