Model Order Reduction of Power Systems Preserving Tie Line Flows

Even with today's technologies, transient stability studies of large power systems present a computational burden. In this paper, a reduced order model of multi-machine power systems is addressed. The methodology is based on information collected from Phasor Measurement Units (PMUs) at boundary buses. The Grey Wolf Optimizer (GWO) is employed then to estimate parameters of the fictitious generator, expressed by the fourth order model with an equivalent exciter. The proposed methodology is tested on 10-machine New England system. Simulation results show the feasibility of the methodology, and the ability to retain the original system behavior for various contingencies.