Oscillation active damping control method and system for grid-tied type-4 wind turbine generator

An oscillation active damping control system for grid-tied type-4 wind turbine generator, comprising:

• a model building module is configured to base on an interconnection model of multiple subsystems for the grid-tied type-4 wind turbine generator, construct a stored energy function and a dissipated energy function of the current inner loop control subsystem in the multiple subsystems, and a first interaction energy function between the current inner loop control subsystem and a DC voltage control subsystem, a second interaction energy function between the current inner loop control subsystem and a phase-locked loop subsystem, and a third interaction energy function between the current inner loop control subsystem and a reactive power outer loop control subsystem, then establish an energy feedback model;
• an adjustment module is configured to obtain the instantaneous angular frequency of a phase lock loop in the phase-locked loop subsystem when the oscillation of the grid-tied type-4 wind turbine generator occurs, based on the energy feedback model, adjust a current reference value of a q-axis current inner loop generated by the reactive power outer loop control subsystem, to make the value of the stored energy function decrease with time, so as to suppress the oscillation.