Mitigation of SSR in presence of wind power and series compensation by SVC

This paper presents an effective control method for a Static Var Compensator (SVC) to damp Sub-Synchronous Resonance (SSR) in presence of Series Compensation (SC) and wind parks based on Doubly Fed Induction Generator (DFIG). The controller design procedure is also presented. The controller uses an easily accessible input signal. As a novel feature, the controller gain is adaptive to wind generation level. The developed controller is validated through computer simulations in PSCAD. The simulations show that the controller is effective for the whole range of wind generation level under various operating conditions. A reasonable SVC rating that meets the requirement for reactive power compensation is sufficient for SSR damping. Wind SSR can be mitigated not only by SVC, but also by other various solutions. Therefore, there is no technical obstacle to utilize series compensation in ac transmission electrically close to large wind parks.