Supplementary Loop in BESS Control Scheme for SSO Mitigation in DFIG-Based Wind Farms

This paper addresses the problem of subsynchronous oscillations (SSO) in a doubly fed induction generator (DFIG) wind farm originated by its interaction with a series-compensated transmission line. Given its relevance in the system, several solutions and analysis methods have been utilized to tackle this issue. This article proposes an innovative function for a battery energy storage system (BESS) in mitigating SSO without compromising its primary functions. To achieve this aim, the article explains the origin of SSO and outlines how incorporating a BESS can effectively ease it. To evaluate the feasibility of this proposal, we conduct extensive simulations on a power system integrating energy-distributed resources from DFIG-based wind farms, employing a BESS to compensate for SSO induced by a series-compensated transmission line. The results confirm that BESS is highly effective in reducing or even eliminating SSO.