The magnitude of a power component common to all the power sources or frequency, if the power sources are {HEAD ~ AC generators} driven by {TAIL ~ constant speed drives}, is compared to a reference to provide an error signal 
driven by
The magnitude of a power component common to all the power sources or frequency , if the power sources are { HEAD ~ AC generators } driven by { TAIL ~ constant speed drives } , is compared to a reference to provide an error signal
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH