Hybrid Stability Index based Optimal TCSC Placement with ALO for Enhanced Power System Performance

Driven by privatisation, the changing terrain of the electricity sector requires the best use of the resources at hand to attain operational dependability as well as economic efficiency. Solving these difficulties depends much on optimal power flow (OPF). Maintaining system security depends on guarantees of power system stability under both normal and contingency conditions at the same time. Particularly the Thyristor Controlled Series Compensator (TCSC), the combination of Flexible AC Transmission System (FACTS) devices provide a good way to improve system stability and reduce possible contingencies. This work suggests a new method for the optimal location of TCSC based on a hybrid stability index (HSI), which jointly identifies the most important lines under stressed system conditions by aggregating the Fast Voltage Stability Index (FVSI) with the Line Utilization Factor (LUF). In parallel, seeking to improve system performance, the Ant Lion Optimizer (ALO) method is used for best generator tuning. We develop a multi-objective optimization framework to reduce transmission line losses, active power production cost, and voltage deviation. Extensive simulations on the IEEE 30-bus test system confirm the validity of the suggested approach. Its performance also is compared with the Harmony Search (HS) method. The results verify that in terms of solution quality and contingency management capacity the combined HSI-based TCSC placement and ALO-based generator tuning method beats the HS algorithm.