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You should check out the Sept/Oct issue of IEEE Industry Applications Magazine which contains an article on motor bearing fluting. There have also been numerous technical papers written over the past few years regarding this problem and means to mitigate it.

Bigamp, Yes, system is never paralleled with grid. All other loads are rectifier-type (i.e. constant power) and full load rejection has been successfully accomplished but required much tuning of the various controllers (GT engine, AVR, VSD & switchgear setpoints). I agree with electricuwe...

Bigamp, All above concerns are valid & should be taken into consideration in your design but rest assured it is possible to make your system work. US Navy has successfully tested a 19 MW PWM VSD (with 6-pulse front end) driven by a 21 MW gas turbine generator in island mode as you would...