Optimal Planning of AC/DC Hybrid System Integrated with Distributed Renewable Energy Considering Economy and Safety

Abstract

In recent years, as the penetration rate of distributed renewable energy and DC load increases, AC/DC hybrid systems provide flexible and efficient access schemes. This paper proposes a two-stage optimal planning method considering the safety of grid integration for AC/DC hybrid system integrated renewable energy and SST. Firstly, the life cycle NPC of the AC/DC system is taken as the optimization objective, the voltage deviation of the distribution network is taken as the safety constraint, and the coupling point power factor of the AC/DC system is considered to optimize the capacity configuration. Secondly, the connection node of the AC/DC system to the distribution network is decided according to the network voltage margin and network loss at each access node. The proposed method is verified in the IEEE 33 bus test system and an industrial park AC/DC hybrid system. The simulation results demonstrate that the proposed method considers the safety and economy at the same time, provides optimal configuration schemes for the grid-connected AC/DC hybrid system, and provides feasible grid-connected nodes. In addition, the optimization of the power factor at the coupling point can improve the system economy.