Energy storage integration in DFIG-based wind energy conversion systems for improved fault ride-through capability

Grid-connected doubly-fed induction generators suffer from limited fault ride-through capability during grid faults and disturbances. This paper proposes a control and energy management scheme for a DFIG-based wind energy conversion system with a converter-free battery energy storage that improves the quality of power delivered to the utility grid during normal operating conditions and enhances the behavior of the system during significant three-phase voltage dips. The converter control system is presented as well as the overall energy management.