  In this manuscript, we present a high-fidelity physics-based truth model of a
Single Machine Infinite Bus (SMIB) system. We also present reduced-order
control-oriented nonlinear and linear models of a synchronous generator-turbine
system connected to a power grid. The reduced-order control-oriented models are
next used to design various control strategies such as: proportional-integral
derivative (PID), linear-quadratic regulator (LQR), pole placement-based state
feedback, observer-based output feedback, loop transfer recovery (LTR)-based
linear-quadratic-Gaussian (LQG), and nonlinear feedback-linearizing control for
the SMIB system. The controllers developed are then validated on the
high-fidelity physics-based truth model of the SMIB system. Finally, a
comparison is made of the performance of the controllers at different operating
points of the SMIB system.
