An HVDC converter station (or simply converter station) is a specialised type of substation which forms the terminal equipment for a high-voltage direct current transmission line. It converts direct current to alternating current or the reverse. Besides the converter itself, the station usually contains:
- three-phase alternating current switch gear
- transformers
- capacitors or synchronous condensers for reactive power
- filters for harmonic suppression, and
- direct current switch gear
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