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The haze-prone areas are usually places with limited transmission line corridors and large power loads. The performance of transmission lines is under threat of haze. The haze particulates around the transmission lines would be charged and affect the electric field near high voltage direct current (HVDC) transmission lines. According to the influence mechanism of haze on ionized field, the electric performance of HVDC transmission lines under haze weather is discussed. In the paper, an improved meshless local Petrov-Galerkin method (MLPG) is proposed to investigate the distribution of ionized electric field, and example of an actual transmission line is studied to verify the validation of the proposed method at first. It is proved that the proposed method agrees well with the measurements. Then the ionized field distribution under different haze weather levels, as well as influenced factor, is discussed. Results indicate that the ionized electric field and ion current density on the ground would increase under haze weather, but with similar trends to good weather condition. Meanwhile, the haze weather levels have greater influence on the ionized electric field than ion current density, where the increase of corona and space charge are the main reasons.

THE IONIZED FIELD CALCULATION UNDER DIFFERENT HAZE WEATHER LEVELS BASED ON IMPROVED UPSTREAM MESHLESS METHOD