Mitigation of subsynchronous control interaction in series-compensated DFIG-based wind farms using a nonlinear partial feedback linearizing controller

摘要: Subsynchronous control interaction (SSCI) is a fast growing electrical between series-compensated transmission lines and power electronic converters of DFIGs that may destroy the machines if not prevented. Thus, nonlinear controller proposed in order to mitigate SSCI doubly-fed induction generator (DFIG)-based wind farms. Partial feedback linearization technique utilized developing involves number design steps. To evaluate performance controller, eigenvalue (modal) analysis electromagnetic transient (EMT) simulation are performed on 100 MW DFIG-based offshore farm connected grid through lines. Eigenvalue study reveals presence several unstable subsynchronous modes with PI while system mostly retains stability use designed linearizing (PFL) unless compensation level too high (above 90%). EMT simulation, other hand, shows prevalent effectively damped PFL less than 2.3 s.