A New Approach to Determine Tie-Line Frequency Bias (B) in Interconnected Power System with Integral Control AGC Scheme

This work is of investigative type to suggest a new approach for determining appropriate value of tie-line frequency bias 'B' for an interconnected power system. The present discussion is not for challenging the conventional trends of selecting values of 'B', however, simulations of single and two area power systems with integral control AGC scheme have been carried out using Matlab and Simulink. Exhaustive investigation has been carried out so as to correlate the parameter 'B' with governor regulation 'R,' power system constant 'Kp' and integral controller gain 'K.' These investigations are limited to (i) making certain remarks on B and R, (ii) determining relation between B and Kp under wide range of operating conditions of power system and (iii) suggesting a possible way in which the AGC scheme can be made to determine appropriate value of 'B' on its own in real time as per prevailing load situations so as to give satisfactory overall performance.