Iyidobi, J. C.; Eneh, I. I. NEURAL NETWORK BASED VOLTAGE STABILITY IMPROVEMENT OF THE NIGERIAN 330KV POWER NETWORK USING UNIFIED POWER FLOW CONTROLLER (UPFC) AND HIGH VOLTAGE DIRECT CURRENT (HVDC) DURING CONTINGENCY OF LARGE LOAD GAIN. IJARET 2023, 14, 1-12.