New method and hardware for grid-connection of wind turbines and parks

The paper describes a novel method and a cost-effective hardware—Transient Booster—to handle wind turbines and parks during grid faults. The drive-train is released from mechanical stress during faults. At the same time, collection and transmission grids are released from electrical stress during grid faults. The method and hardware are especially attractive for emerging park demands. They form also a basis for reviving existing turbines at sea as well as on land to fit with new or expanded grid code. Both system performance and conversion efficiency are kept normal during hitherto controlled operation.