Mechanism Analysis of Multiple Disturbance Factors and Study of Suppression Strategies of DFIG Grid-Side Converters Caused by Sub-Synchronous Oscillation

With the increasing utilization of electronic equipment in power system, sub-synchronous oscillation (SSO) has occurred many times and caused off-grid accidents because oscillation. SSO become one main problems that restrict development new energy. In this paper, grid-side converters (GSCs) doubly-fed induction generators (DFIGs) under is studied. Firstly, influence mechanism on GSC multipath disturbance Secondly, problem coupling by PLL output errors after coordinate transformation studied, mathematical model considering established. By analyzing suppression ability quasi-resonant controller variable states, key influencing factors for strategies are determined. Furthermore, based above theoretical analysis research, an improved designed to eliminate its GSC. At same time, a DFIG-GSC strategy using adaptive multi-path Finally, effectiveness proposed verified simulation experimental results.