Optimal location and sizing of thyristor controlled series compensation on Nigerian longitudinal transmission system using dragonfly algorithm

Enhancement of longitudinal transmission system through voltage profile and line flow control is achievable through Thyristor Controlled Series Compensator (TCSC) incorporation in power systems. The use of an existing method such as arbitrary placement of TCSC was found to be ineffective for these purposes compared to the optimal placement approach. Power flow equations of the power system were linearized with the use of the Newton-Raphson (NR) iterative technique at the steady state. Dragonfly Algorithm (DA) was adopted for optimal placement of the TCSC and simulated in MATLAB R2018b environment. The DA was implemented on the Nigerian 28-bus power system for normal loading and at 25% overload. The voltage profile deviations of buses 9, 16, and 22 that were more than ±5% were controlled to fall within the acceptable ranges and the heavily loaded transmission lines were redirected. The optimized placement of TCSC gave a better result when compared with the conventional TCSC placement.