Rotor Angle Transient First-Swing Stability Analysis of Synchronous Condensers Near Wind Farms

Synchronous condensers (SCs) installed near wind farms (WFs) can enhance the grid strength and improve the power transfer capability of wind farms. However, as a special kind of synchronous machine, SC also has the risk of transient angle instability, especially under the influence of WFs. To this end, this paper analyzes the rotor angle transient stability mechanism of SC near WFs and corresponding influencing factors. The transient instability forms of the SC are first explored. Then, the influence of fault types and the low-voltage ride-through (LVRT) depth of WFs on the transient stability is analyzed based on the equal-area criterion. Finally, the analysis conclusions are verified in a simplified WF-SC combined system by time-domain simulations. Results show that the dynamics of WFs significantly increase the risk of transient instability of SC. Moreover, SCs present different transient instability forms under different fault types and LVRT depths.