Investigation on damping mechanism of machine-side dynamics of permanent magnet synchronous generator-based wind generation system

A permanent magnet synchronous generator-based wind generation system has been predominantly applied in wind farms. With the wide application of wind generation, mechanical shafting attracts wide attention as torsional vibration problems may occur in its mechanical rotational system, which can further affect the power system. The paper first intentionally designs a two-open-loop two-mass shaft subsystem model to investigate the interactions among wind turbine mass, generator mass, and machine-side converter, that is, the machine-side dynamics. Then, a bilateral damping contribution analysis is proposed to investigate the damping mechanism of these machine-side dynamics. The impact mechanism of one dynamic on another through the damping contribution channel can be revealed by modal analysis, indicating the coupling of different oscillation modes and the complex interactions of machine-side dynamics. The established two-open-loop two-mass shaft subsystem model and the proposed bilateral damping contribution analysis with the identified damping contribution channel of the permanent magnet synchronous generator-based wind generation system are validated.