Comprehensive Assessment Of Voltage Stability And Security Enhancement In The Libyan High-Voltage Grid

Abstract

This research proposes an integrated framework for the static and dynamic security assessment of the Libyan 220/400 kV transmission infrastructure. The study investigates system resilience through N-1 contingency analysis and bifurcation-based voltage stability evaluation using PV and QV curves. By employing Performance Indices (PI) for criticality ranking, the analysis quantifies the impact of severe contingencies under diverse loading conditions (5523 MW and 6200 MW). Furthermore, a sensitivity analysis is conducted on generator dispatch strategies and Automatic Voltage Regulator (AVR) configurations to identify optimal security margins. Dynamic simulations highlight oscillatory stability boundaries and the proximity to voltage collapse. Finally, the study validates strategic reinforcement measures—including 400 kV infrastructure upgrades—using NEPLAN, demonstrating a significant enhancement in the grid’s operational reliability.