Small Disturbance Stability Analysis of Direct-Drive Wind Turbines with Series Compensation Integration System Under VSG Grid Forming Control

With the increasing integration of renewable energy sources connecting into the grid, the stability issues of grid-forming wind turbines have become a growing concern. Addressing the potential small disturbance instability in direct-drive wind turbines when connected to a series compensation system under VSG (Virtual Synchronous Generator) control, this paper first proposes a detailed small-signal model for direct-drive wind turbines under VSG grid-forming control. Subsequently, the study analyzes the dominant eigenvalue trajectories, examining the impact of active voltage control, series compensation circuit, and voltage-current loop control parameters on the system’s stability."