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This paper presents a comparative study of voltage stability indices for three different long transmission technologies. High Voltage AC (HVAC), hybrid High Voltage DC (HVDC) and bipolar HVDC lines are compared in terms of voltage stability and point of collapse. Each scenario is analyzed with different lengths of transmission lines and in different contingency conditions. The impacts of HVDC control modes and parameters on interconnection voltage stability are also examined. Simulations are carried out on a simplified Australian power system with CIGRE HVDC models using the Power Factory software package.