Design and comparison of I, PI, PID and Fuzzy logic controller on AGC deregulated power system with HVDC link

In the present work two control areas are taken, in each area two thermal power generating systems. For a system with HVDC link in parallel with AC tie line the dynamic analysis is carried out. The advantage of HVDC link is to implement frequency stabilization in interconnected power systems. The reason for Automatic Generation Control (AGC) system getting affected is open transmission access and evaluation of more socialized companies. Therefore conventional two area system is changed so that it considers the effect of bilateral contract on dynamics. In comparison with the HVDC link ac tie line dynamic response of two area hydro thermal system is degraded and sluggish. The paper discusses the effects of Integral, PI, PID and fuzzy controller with and without HVDC on an interconnected two area power system in a deregulated environment. Using Matlab-Simulink frequency deviation is simulated with different controllers. The responses of deviation in tie-line power and deviation in frequency are plotted for different controllers with optimum gain values and the performances are compared with the proposed Fuzzy Logic Controller (FLC).