Adaptive Active Damping Control Method for Power Conversion System to Suppress Sub-/Super-Synchronous Oscillation of PMSG Grid-Connected System

This paper proposes an adaptive active damping control method for the power conversion system (PCS) to address the issue of sub-/super-synchronous oscillations caused by the connection of drive permanent magnet synchronous generator (PMSG) grid-connected systems to weak grids. Firstly, the impedance model of the PMSG grid-connected system with a power conversion system is established and the impedance characteristics are analyzed. It is found that the system impedance tends to interact with the grid impedance when the system output power increases or the grid short-circuit ratio (SCR) decreases, thus inducing sub-/super-synchronous oscillations. The proposed control method can adaptively improve the impedance characteristics of the PMSG grid-connected system and effectively suppress the sub-/super-synchronous oscillations. Finally, a simulation model of PMSG grid-connected system with PCS based on Simulink is established to verify the effectiveness of the method.