Stability Analysis of Time Delayed Generator Excitation Control System using Resultant Theory

Author(s):

T. Jesintha Mary , R.M.D Engineering College,Kavarapettai; J. Sumithra, R.M.D Engineering College

Keywords:

Delay margin, generator excitation control system, Rekasius’s substitution, Resultant theory, Time delays

Abstract:

Time Delays have become unavoidable in Power System due to the usage of measurement devices and communication links for transferring the control signals. This paper investigates the effect of time delays on the stability of a generator excitation control system with a stabilizing transformer. An analytical method based on frequency domain approach is proposed to compute the delay margin for stability. First, the transcendental characteristic equation is transformed into a polynomial using Rekasius substitution. Then with the help of Resultant theory the lower bound of crossing frequency is determined. After determining the crossing frequency, the delay margin is determined using back transformation formula. The theoretical delay margin values are computed for different sets of controller gains .The theoretical results indicate that the addition of a stabilizing transformer to the AVR system increases the delay margin and improves the damping performance of the system. The theoretical delay margin results are validated using MATLAB/SIMULINK.

Other Details:

Manuscript Id	:	IJSTEV4I5057
Published in	:	Volume : 4, Issue : 5
Publication Date	:	01/12/2017
Page(s)	:	200-205

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