Fault-tolerant control technique of open-winding brushless doubly-fed wind power generator based on dual three-level converters

The brushless doubly-fed generator (BDFG) has the advantages of brushless structure, variable-speed constant-frequency operation, flexibly controllable active and reactive powers, low converter capacity and cost, and so on, which is very suitable for the wind power generation, especially the large wind turbines and offshore wind farm [1].