This paper is focused on the discussion and comparison of characteristics and behavior of\nthree low frequency ac (LFAC) transmission system configurations operating under the same control\nscheme and conditions to identify the most promising operation system for LFAC. Merits of LFAC\nover high voltage direct current (HVDC) are mentioned first. By changing power flow direction\nwithout auxiliary switches in multi-terminal application and easiness of short circuit protection are\nexplained. The three configurations of LFACs are described and applied by the control scheme with\nthe aid of the tool of the PSCAD/EMTDC software to consider the behavior of each LFAC system\non line frequency and low frequency sides. For two-phase system, no fluctuation occurs on the\nline frequency side, which is the advantage over single-phase system. Furthermore, current rating\non thyristor devices during operation and number of devices that used in each type of LFAC are\ncalculated and compared. These results can lead to determine the most suitable transmission system\nfor the LFAC system operation.
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