This guide provides general guidelines for commissioning high-voltage direct-current (HVDC) converter stations and associated transmission systems. These guidelines apply to Line-Commutated Converter (LCC) HVDC systems utilizing 6-pulse or 12-pulse thyristor valve converter units (see Figure 1) operated as a two-terminal HVDC transmission system or an HVDC back-to-back system. Excluded from this guide are guidelines for commissioning multi-terminal HVDC systems, synchronous compensators, static synchronous compensators, and static var compensators.