Analysis of low voltage ride-through capability and optimal control strategy of doubly-fed wind farms under symmetrical fault

Abstract Given the “carbon neutralization and carbon peak” policy, enhancing low voltage ride-through (LVRT) capability of wind farms has become a current demand to ensure safe stable operation power systems in context possible severe threat large-scale disconnection caused by farms. Currently, research on LVRT mainly focuses suppressing rotor providing reactive support, while impact active output performance not been thoroughly discussed. This paper studies reveals relationship between limit depth drop during for doubly-fed induction generator (DFIG) based Specifically, grid-side converter is independent drop, its maximum allowed converter, DFIG stator linear function drop. An optimized scheme allocating among STATCOM, stator, proposed. The maximizes satisfying standard requirements output. Compared traditional schemes, proposed optimization strategy can more period, effectively rate speed increase, improving fault recovery Simulation results verify effectiveness scheme.