Bang-Bang Excitation Control

This paper concerns itself with the time-optimal control of large oscillations in power systems by bang-bang excitation control. The determination of the instants at which the control is switched from one level to another and the application of such a piece-wise constant control to a tenth order nonlinear model which includes the effects due to field time lag and damper bars and the dynamics of exciter and govternor are the principal aspects of the paper. The results show that as compared to the normal proportional voltage regulator the bang-bang control effects more efficient damping of the system. Significant improvements are seen in the rate of response and the number and amplitudes of oscillations. The enhancement of the critical clearing time due to bang-bang network control is inidicated. It is hoped that the approach to the bang-bang control outlined in this paper would serve as a guide to future system studies on discontinuous control.