Equilibrium point control of one-machine infinite-bus model power system considering AVR limiter

This paper treats a one-machine infinite-bus model power system with AVR and GOV. First, a three-phase short-circuit fault is assumed, and equilibrium points of the swing equations are obtained. Next, the supplementary control input u_a for AVR is determined on the basis of the equilibrium point control proposed by the authors. Therefore, the equivalent electric power output increases, where the AVR limiter is positively considered, Also the supplementary control input u _g, for GOV is determined by setting the unstable equilibrium point into the neighborhood of the limiter. Then, the critical clearing time t_cr, becomes longer, and the capacity of electric power output P_emax increases up to almost 150%