Damping torque analysis for open‐loop modal resonance as a cause of torsional sub‐synchronous oscillations excited by grid‐connected wind farms

Incidents of sub-synchronous oscillations (SSOs) reported in the Hami power network western China indicate that torsional dynamics a synchronous generator (SG) can be excited by grid-connected wind farm and trigger SSOs. The concept open-loop modal resonance (OLMR) reveals excitation mechanism from standpoint system condition. This paper proposes novel damping torque analysis (DTA) for detecting assessing risk OLMR exciting SSOs complex with multiple farms. proposed is modal-computational free also accurately identify responsible Moreover, DTA provides physical insight into to facilitate an understanding essential reasons may excite effectiveness demonstrated evaluated example