Analysis and Control Suggestions of Transient Characteristics of AC/DC Hybrid Power Grid under DC Faults

With the rapid development of power system, the coupling characteristic of AC power grid and DC power grid have become stronger and stronger, leading to more and more serious problems in the safe and stable operation of the power grid. The paper mainly focuses on the analysis and research of the transient characteristics of the AC/DC hybrid system. Firstly, the principle and operation mode of UHV DC transmission are explained. Secondly, the equivalent model of the AC/DC hybrid power grid system is established, and the transient stability characteristics of the transmitting-end power grid are analyzed. Finally, the simulation analysis is carried out. And the operation suggestions are given when the AC/DC hybrid system fails according to the simulation results, which provides a basis for the stable operation of the AC/DC hybrid power grid.