Abstract

Transmitting bulk amount of electrical power over long distance is one of the primary aims of the power system. High-voltage alternating current (HVAC) power transmission is the standard way, while high-voltage direct current (HVDC) based system is increasingly becoming important. HVDC is particularly important for renewable energy integration, large-scale interconnection of distributed sources, over long distances, reducing transmission losses. Transmission line length which impacts the line parameters is an important factor. In this paper, a concept of tuned HVAC line is presented, where the voltages and the currents at the receiving and the sending-ends become numerically equal. This can be very effective in reducing the reactive power losses. Thus, the transmission frequency would be adaptively varied based on the line length. Static frequency converter would be one of the most important parts for the tuned HVAC line. The design and implementation issues are presented in details. Critical factors like loss, skin effect, power transfer, existing line usage, protection issues are comparatively discussed for the tuned HVAC and the HVDC systems.

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