Automatic Generation Control of Multi Area Interconnected Hydro-Thermal Power System with HVDC Links

Abstract

This paper investigates the effects of HVDC link in parallel with HVAC link on automatic generation control (AGC) problem for a multi area power system taking into consideration system parameter v ariations. A fuzzy logic controller is proposed for four area power system i nterconnected via parallel HVAC/HVDC transmission link which is also referred as asynchronous tie- lines. The linear model of HVAC/HVDC link is develope d and the system responses to sudden load change are studied. The si mulation studies are carried out for a four area interconnected thermal power system. Suitable solution for automatic generation control problem o f four area electrical power system is obtained by means of improving the dynamic performance of power system under study. Robustness of controll er is also checked by varying parameters. Simulation results indicate tha t the scheme works well. The dynamic analyses have been done with and withou t HVDC link using fuzzy logic controller in Matlab-Simulink. Further a comparison between the two is presented and it has been shown that the per formance of the proposed scheme is superior in terms of overshoot and settli ng time