Fault isolation in parallel coupled wind turbine converters

Parallel converters in wind turbine give a number advantages, such as fault tolerance due to the redundant converters. However, it might be difficult to isolate gain faults in one of the converters if only a combined power measurement is available. In this paper a scheme using orthogonal power references to the converters is proposed. Simulations on a wind turbine with 5 parallel converters should a clear potential of this scheme for isolation of this gain fault to the correct converter in which the fault occurs.