Method and system for tracking the oscillation path of a direct drive wind farm

A system for tracking oscillation path of a direct drive wind farm, comprising:

• a data acquisition module, configured to collect port current, current and state variable of current inner loop, dynamic angle and state component of a phase-locked loop of each direct drive wind turbine generator, and phase and amplitude of a voltage of a fault point in an acquisition period which is used as a dominant oscillation mode period when the direct drive wind farm fails, and then to obtain a corresponding instantaneous value of each oscillation component of said each direct drive wind turbine generator;
• a coupling energy transfer path acquisition module, configured to obtain an energy flow of a coupling energy transfer path of the direct drive wind farm in each acquisition period based on the corresponding instantaneous value of each oscillation component collected in said each acquisition period;
• a key energy transfer path tracking module, configured to track a key energy transfer path of the direct drive wind farm according to the energy flow of the coupling energy transfer path of the direct drive wind farm in said each acquisition period, so as to realize stability control of the direct drive wind farm.