Study on Operation Characteristics of Wind Power Grid-connected Doubly-Fed AC/DC Hybrid System

Aiming at the impact of large-scale wind power integration on the operation characteristics of HVDC, this paper builds an AC-DC hybrid double-fed HVDC system including wind power generation. In the PSCAD/EMTDC software, the steady-state and transient operation characteristics of wind power access system are studied. The results show that the system can reach stable operation within 0.2s when the system starts. When the three-phase short-circuit ground fault occurs, the DC voltage and active power of the system show a downward trend, after the 0.05 s fault removal, active power of line gradually restores stability under the action of regulator, but line voltage appears unstable. When one end is disconnected, the voltage and active power on the fault side change to zero instantaneously, and the other end has a small reduction, and then it can resume normal operation.