Abstract
Because of the subsynchronous oscillation caused by wind turbines connected to the AC power grid, the causes of subsynchronous oscillation are analyzed, and the frequency impedance test method of a wind turbine is proposed, which can effectively evaluate the impedance characteristics of a wind turbine. On this basis, the research on the influence of the parameters of several network side control links of the wind turbine generator, such as phase lock loop, current loop, and voltage loop, on the impedance characteristics is carried out. Combined with the influencing factors, a targeted improvement scheme for subsynchronous oscillation is proposed to improve the safety and stability of the wind turbine generator grid connection.
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