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A few, at least. There are probably more. First, since the frequency is zero, reactive losses due to cable inductance are eliminated. Next, possible health risks due to alternating magnetic fields are reduced. Also, the non-trivial problem of syncronizing two power grids is eliminated. The DC is syncronously converted back to AC at the receiving end's phase and frequency, without regard to the generating end. Another possible benefit (from my point of view at least) is that HVDC systems are, to my knowledge, almost always run underground, eliminating unsightly transmission towers and lines.

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Q: What are the advantages of High Voltage DC transmission over High Voltage AC transmission system?
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