  The mathematical modeling of open-switch faults in two-level machine-side
converters and the fault-tolerant current control of isotropic permanent-magnet
synchronous generators are discussed. The proposed converter model is generic
for any open-switch fault and independent of the operation mode of the
electrical machine. The proposed fault-tolerant current control system gives
improved control performance and reduced torque ripple under open-switch faults
by (i) modifying the anti-windup strategy, (ii) adapting the space-vector
modulation scheme and (iii) by injecting additional reference currents. The
theoretical derivations of model and control are validated by comparative
simulation and measurement results.
