Design of observer based optimal controller in co-ordination with frequency controllable HVDC link in a multi area deregulated power system

In this paper an observer based load frequency controller is called local load frequency controller is proposed to mitigate load frequency control problem of multi area deregulated thermal power system. In each control area a local load frequency controller (LLC) is located in coordination with controllable HVDC link. This paper presents design of Utkins observer based controller(local load frequency controller) for load frequency control of multi area power system in coordination with HVDC link have been proposed. The coordination with local load frequency controller and HVDC link is tested on two area deregulated power system under one possible contract scenario.