Optimal Dispatch of AC/DC Hybrid Low-voltage Distribution Network Based on Multi-mode Flexible Interconnection

The transformation for the distribution network by the flexible interconnection device can realize the flexible and efficient interaction between source, grid, load and storage, and solve the problems of load imbalance and power quality caused by the large number of distributed generators. Aiming at the flexible interconnection in low-voltage transformer area, an optimal dispatch model of AC/DC hybrid low-voltage distribution network based on multi-mode flexible interconnection is proposed. First, considering the networking forms of back-to-back and hybrid AC/DC low-voltage flexible interconnection devices, the low-voltage model of the flexible interconnection device and the PV-storage-charge-load element is established. Then, based on the low-voltage model, taking multi-level load imbalance degree, network loss and operation cost as optimization objectives, an optimal dispatch model of AC/DC hybrid low-voltage distribution network based on multi-mode flexible interconnection is proposed. Convex optimization theory is also used to convexize and linearize the model, and Gurobi solver is called to obtain the global optimal solution of the model. Finally, the effectiveness of the proposed model and the solution algorithm is verified by the case of AC/DC hybrid low-voltage distribution network. © 2023 Automation of Electric Power Systems Press. All rights reserved.