Stability Enhancement of HVDC Line by Firefly Controlled Pi

In the developing technology of power system there desired power control at every point and it is obtained by power controllers like HVDC. A large class of researchers have used VSC controlled HVDC system for transient minimisation. They have used active power and voltage controlled loop using PI controller and set the values of gain parameters in PI by hit & trial method which requires setting of gain parameters again. In our work it will be the main area of research. The main objective of this paper is to improve power transmission capacity and power quality of HVDC transmission. To avoid the settling of PI gain parameters for converter in HVDC which is computational complex, we used teacher learner based optimisation algorithm (TLBO), which on the basis of deflection of DC link voltage to reference, optimise the PI gain parameters