Active power support of a full-scale converter-based WECS through modular flywheel storage system with DC bus signaling

The following paper presents a modular system for active power support in wind generators. It works on the base of a Flywheel Energy Storage System (FESS) coupled to the DC link of a medium voltage back-to-back multilevel converter. Two ANPC-5L compose a full-scale converter interface and a third converter tied to the DC link drives a flywheel through an induction machine. All converters have predictive controllers (FCS-MPC) and the charge-discharge management is decoupled from the wind conversion system. It is fully decentralized and does not need any communication with the rest of the system, which provides modular storage capability.