Improvement of dynamic performance of three area thermal system under deregulated environment using AC tieline parallel with HVDC link

This paper presents an analysis on dynamic performance of a three-area thermal system interconnected with AC tie-line parallel with HVDC link when subjected to parametric uncertainties. In this paper all the three areas consists of thermal power plants. The AC tie-line parallel with HVDC link is used as a system interconnection between all the three areas. Open transmission access and the evolution of more socialised companies for generation, transmission and distribution affects the formulation of Automatic Generation Control (AGC) problem. So, the traditional three area system is modified to take into account the effect of bilateral contracts on the dynamics. It has been observed that the dynamic response of three-area interconnected thermal plants through tie-line is sluggish and degraded when compared to the dynamic response of three area interconnected thermal power plants connected through an AC tie line Parallel with HVDC link.