| Abstract: |
Power transmission systems face critical voltage stability challenges due to increasing load demands and integration of renewable energy sources. This research investigates the application of Flexible AC Transmission Systems (FACTS) devices for enhancing voltage stability in transmission networks. The study examines Static VAR Compensator (SVC), Static Synchronous Compensator (STATCOM), Thyristor Controlled Series Capacitor (TCSC), and Unified Power Flow Controller (UPFC) on IEEE 14-bus test system. Continuation Power Flow (CPF) methodology with Newton-Raphson technique was employed to analyze voltage stability margins. Results demonstrate that UPFC provides maximum loading margin improvement of 48.3%, followed by STATCOM (42.7%), SVC (38.5%), and TCSC (35.2%). Voltage profile improvements ranged from 12.4% to 18.6% across critical buses. Statistical analysis reveals significant correlation (r=0.94) between reactive power compensation and voltage stability enhancement. Power loss reduction of 32.8% was achieved with optimal FACTS placement. The research confirms that strategic deployment of FACTS devices substantially improves transmission system voltage stability, reduces losses, and enhances overall power system security. |
