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One of the main objectives of the smart grid initiative is to enable bulkpower transmission over long distance, with reduced transmission losses.Besides the traditional high-voltage alternating current (HVAC) transmission,with the advancement in power electronics, high-voltage direct current (HVDC)transmission is increasingly becoming important. One of the main factorsimpacting the transmission line parameters and the losses is the length of thetransmission line (overhead). In this paper, a concept of tuned high-voltage ACline is presented for long (> 250 km) transmission line. A tuned line is wherethe receiving-end voltage and current are numerically equal to thecorresponding sending-end values. This paper presents the detailed theoreticalanalysis of the tuned HVAC line, suggesting adaptation of the transmissionfrequency as per the length of the line. The simulation of a tuned HVAC line isperformed using the PSCAD/EMTDC. Simulation results for two different linelengths, substantiate the theoretical analysis of reducing the reactive powerabsorbed in the line, while increasing the active power transmission.

Theoretical Analysis of Tuned HVAC Line for Low Loss Long Distance Bulk Power Transmission