Non-linear excitation control of a synchronous generator using robust feedback linearization

Abstract

The objective of this paper is to design non-linear excitation controllers for synchronous generators using robust feedback linearization. Since disturbances acting on power systems are of random nature and since the variations in the interconnection variables, the machine currents, cannot be known with certainty, such systems have to be treated as non-linear uncertain stochastic systems. To take advantage of well-developed robust linear control techniques, differential geometry and stochastic calculus are used to transform the non-linear system to an equivalent linear uncertain system. Simulation results of a single-machine infinite-bus system indicate that the proposed controller provides a larger stability margin than that obtained using existing linear and non-linear controllers.