Load frequency control of two area power system with AC-DC tie line using PSO optimized controller

This paper presents the load frequency control(LFC) of two area interconnected power system each comprising of a thermal unit with reheat turbine and a hydro generating unit. In order to have better performance of LFC, proportional-integral-derivative(PID) controller is used whose parameters are optimized using particle swarm optimization (PSO) technique. In the present work, effect of AC-DC tie lie on the performance of LFC in two area power system using PSO tuned controllers is tested and compared with the performance of LFC with only AC tie line. It is observed that the transient performance of the system with parallel AC-DC tie line is improved when compared to the performance of the system with only AC tie line. The results obtained are compared and presented.