Research On Transient Voltage Stability Of Grid-Connected Wind Farms Based On VSC-HVDC

The stability issues about wind farm integration are investigated in this paper. The main achievements include:(1) A transient stability analysis model of VSC-HVDC and the linear decoupling control schemes for supplying active networks are investigated in the dissertation. Active and reactive power is realized through the feed-forward compensation technique for electrifying active systems to decouple control DC voltage and reactive power. (2) The mathematical model and control model of grid-connected DFIG wind farms with DFIGs are studied, then the rotor side converter controller, grid side converter controller, wind turbine control system and the pitch angle controller model are presented. (3) The transient voltage control of grid-connected wind farms with DFIGs is studied, and then the transient voltage stability control strategy of grid-connected wind farms with DFIGs based on VSC-HVDC is advanced. The simulation results show that the transient voltage stability of grid-connected wind farms based on VSC-HVDC is improved.