Abstract
This paper is focused on the discussion and comparison of characteristics and behavior of three low frequency ac (LFAC) transmission system configurations operating under the same control scheme and conditions to identify the most promising operation system for LFAC. Merits of LFAC over high voltage direct current (HVDC) are mentioned first. By changing power flow direction without auxiliary switches in multi-terminal application and easiness of short circuit protection are explained. The three configurations of LFACs are described and applied by the control scheme with the aid of the tool of the PSCAD/EMTDC software to consider the behavior of each LFAC system on line frequency and low frequency sides. For two-phase system, no fluctuation occurs on the line frequency side, which is the advantage over single-phase system. Furthermore, current rating on thyristor devices during operation and number of devices that used in each type of LFAC are calculated and compared. These results can lead to determine the most suitable transmission system for the LFAC system operation.
Highlights
High Voltage Direct Current (HVDC) is widely applied for point to point connection between power systems
This paper explains the features of three configurations of the low frequency ac (LFAC) and Line-Commutated Current Source Converters (LCC)-HVDC
Focusing on the application of multi-terminal systems, three low frequency ac transmission system configurations using cycloconverters with the same system scale have been presented for studies on the circuit operation and suitable number of operating phases
Summary
High Voltage Direct Current (HVDC) is widely applied for point to point connection between power systems. Voltage Source Converters (VSCs) including Modular Multi-level Converter (MMC), are mostly used in the HVDC systems. LCC-HVDC still remains the dominant technology for long distance bulk power transmission due to its lower investment costs and much higher maximum power transfer capacities. Besides LCC-HVDC and VSC-HVDC, high-voltage low-frequency ac transmission system (LFAC). The increase of power capacity and transmission distance due to decreased transmitting frequency. The increase of power capacity and transmission distance compared to to the the conventional conventional LFAC due toto the increasing number of of interconnections between new wind power installations and the grid [5,6].
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