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High voltage DC power transmission project generally converter stations, transmission lines, grounding electrodes, and compared with the AC transmission has many advantages, especially in the high-power and long-distance power transmission grid interconnection DC transmission AC transmission unmatched advantages. DC transmission in the composition of China's power grid, in particular, play a huge role in the \High-voltage power transmission project because of its high-voltage, high-current, conductor potential gradient and other factors have some impact, its nearby environment. DC power transmission project impact on the nearby environment includes not only the frequency electric field, magnetic field, radio interference, audible noise, but also because of its DC current transfer unique environmental impact factors: DC synthetic electric field and ion flow, DC magnetic field. The DC power transmission project the electromagnetic environmental impact in overseas research more, although our ± 500kV of Genan DC transmission project built in the 1880s, and our DC project's environmental impact study not systematic. This paper by ± 500kV Genan Long governance, Tian Guang, the Kao DC power transmission project converter station near the line along the electromagnetic environmental impact survey, the first objective reflects our current DC power transmission project electromagnetic state of the environment; according to the requirements of our DC project design and electromagnetic environmental assessment prepared DC synthetic field strength, the ion current density, DC magnetic field calculation program; developed for the study of the electromagnetic environment of the DC line has been running, ground synthetic field ion current test instruments; and ± 500kV Genan Dragon political, Tian Guang, Kao DC line ground synthetic field, ion current density, and DC magnetic field were selected points tested. While taking advantage of the test results, verify the reasonableness, correctness of the calculation procedure. The survey results show that the DC line has almost no effect on the daily life of nearby residents; converter station noise impact residents in the neighborhood. Ground synthesis field strength measurement value of the DC line is generally less than 30kV / m or less, and ground synthetic field strength by ion greater impact; ground ion current measurement results are smaller than the 100nA/m2. DC power transmission project electromagnetic environment evaluation technical indicators, combined with the experience of other countries on the basis of investigation and testing, and evaluation of technical specifications, has an important significance for the guidance of HVDC engineering design, electromagnetic environmental assessment .
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