Abstract
Half wavelength AC transmission (HWACT) is a promising technology with unique advantages in the field of large power transmission over long distance. However, there is little study on the grid connection of HWACT, which shall be an important technical point for its engineering application. This paper deals with the point-to-grid connection of an HWACT line. Firstly, the requirements of grid connection are reviewed, after that the quasi-synchronization is identified for the further study. Then the point-to-grid connection of HWACT under various connection conditions is simulated using PSCAD/EMTDC. The point-to-grid connection characteristics between the HWACT line and the conventional line are compared and analyzed. The simulation results show that when there is only a phase angle error and both the voltage error and the frequency error are zero, the point-to-grid connection characteristics are different. The point-to-grid connection characteristics are the same, provided that there is only a small voltage or frequency error on both sides of the grid-connection switch.
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