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三峡电力外送规划中，拟采用两条５００ｋＶ直流输电线与华东联网，其输电距离、线路电压等级及走向均与葛南直流输电大体相同，对谐波干扰的控制而言，应有连贯性。鉴于葛南直流工程投产后发生直流谐波严重超标，为使三峡直流工程中避免类似情况出现，根据葛南工程经验和目前直流工程发展趋势，提出了三峡直流谐波的控制范围及滤波器选择时应注意的问题。
In the planning of power transmission to the Three Gorges, two 500kV DC transmission lines are planned to be interconnected with East China. The transmission distance, line voltage level and direction are generally the same as that of Genan DC transmission. For the control of harmonic interference, there should be consistency . In view of the serious harmonic distortion of the DC project after the Geinan DC project was put into operation, in order to avoid the similar situation in the Three Gorges DC project, according to the experience of Gean project and the current development trend of DC project, the control range and filter selection of the DC harmonic of the Three Gorges Project Should pay attention to the problem.