Modeling of Sequence Impedance for VSC-HVDC

VSC-HVDC grid connection technology has gradually become an ideal solution for large-capacity long-distance offshore wind power grid connection. This scheme has the problem of instability caused by the interaction between the wind turbine and the VSC-HVDC converter and its control system, which may cause sub-synchronous oscillation. To solve this problem, this paper uses the harmonic linearized impedance modeling method to establish the sequential impedance models for the receiving and transmitting stations of VSC-HVDC, respectively. The corresponding simulation model was established on PSCAD and the correctness of the sequence impedance model was verified.