Stability analysis of sub-/super-synchronous oscillation based on closed-loop transfer function poles of D-PMSG wind power systems

In recent years, the sub-/super-synchronous oscillation (SSO) caused by grid integration of direct-drive permanent magnet synchronous generators (D-PMSG) has attracted wide attention. However, most of the existing stability analysis methods are either complex or cannot quantitatively analyze the influence of parameter changes on system stability. To address the problems, this paper proposes a novel stability analysis method for SSO in the D-PMSG integrated power system based on closed-loop transfer function poles. Firstly, the impedance modeling method was introduced to analyze the stability of the D-PMSG power system. Then, a stability criterion was proposed based on the poles of the closed-loop function. The proposed criterion is simple and has a clear physical background. The real part of the poles represents the damping while the imaginary part of the pole reflects the oscillation frequency. Finally, simulation results verify the accuracy and effectiveness of the proposed method. Moreover, its application in influence factors for quantitative analysis was also validated. (c) 2022 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.