Interfacing synchronous machines with power systems for fault analysis: constructing symmetrical components from machine dqO quantities

Presents a procedure for obtaining time-domain solutions for faulted power systems containing multiple rotating machines. The time-domain solutions are obtained using a combination of both time and steady-state frequency-domain techniques. The transmission network is modeled using steady-state AC techniques, while the rotating machines are represented by sets of coupled differential equations. The interface between the time-domain machine models and the frequency-domain transmission network model transforms the differential equation solutions into the appropriate frequency-domain phasors. The combination of time and frequency-domain analysis allows the total number of calculations required for a solution to be considerably less than the number required for a complete time-domain solution