IEC TS 63471:2023为直流电压高于1.5 kV的HVDC电网提供了推荐的直流电压系列。它涉及多端HVDC电力传输和分配系统以及网状HVDC网络、电网的标称DC电压的选择，而不是额定DC电压或最高DC电压。 对于任何独立（不构成DC电网的一部分）HVDC项目（例如点对点HVDC电力传输和分配系统）的DC电压选择，没有严格要求考虑该DC电压系列。然而，为了便于以后向更大的HVDC系统发展，使用标准化DC电压是非常有用的。在后期阶段，随着多终端系统和网状HVDC电网，为了优化资本和运营成本，协调电压的使用确实将变得至关重要。此外，对于全新的项目，系统规划应包括这种展望，并可从使用推荐的直流电压系列中受益。

IEC TS 63471:2023 provides a recommended DC voltage series for HVDC grids with a DC voltage above 1,5 kV. It concerns the selection of a nominal DC voltage of multi-terminal HVDC power transmission and distribution systems and meshed HVDC networks, grids, rather than a rated DC voltage or highest DC voltage.
There is no stringent requirement to consider this DC voltage series for the DC voltage selection for any stand-alone (not forming part of DC Grid) HVDC projects, e.g. a point-to-point HVDC power transmission and distribution system. However, in order to facilitate the later progression towards larger HVDC systems in the future the use of standardized DC voltages is very useful. At later stages, with multi-terminal systems and meshed HVDC grids, the use of harmonized voltages will indeed become essential in order to optimize both capital and operational costs. Also, for entirely new projects, system planning should include this outlook and can benefit from the use of the recommended DC voltage series.