Abstract:

Gonghe Basin in Qinghai is one of the largest new energy bases in China. The large-scale construction of new energy facilities will have a great impact on the regional environments. In this paper， the influence of photovoltaic arrays （PVA） on the wind field is studied by establishing the wind observation sections inside and outside the arrays， setting up 5 sets of 5-gradient mobile automatic anemometer stations， and carrying out the synchronous monitoring. The results show that： （1） The PVA can change the wind direction in the array， and the wind direction is mainly westerly and easterly. When the angle β≥45° between the wind direction of the open field and the long axis of the PVA， there is a transverse flow around the PVA. （2） The whole PVA has the effect of weakening wind， and the rate of weakening wind increases exponentially with the height， but the weakening effect of wind speed at 20cm in height has uncertainty， even increasing the wind speed. The rate of weakening wind have a three-peak and three-valley pattern with the wind direction variation. The maximum rate appears at β=45° or β=67.5°， and the minima rate mostly appears at β=22.5°. （3） The wind direction and wind speed in the PVA are asymmetric due to the structure of the PVA with north-high and south-low and the wind path length. The dual-wind-direction characteristic of PVA and the wind-guiding effect of the lower part of the PVA are beneficial to the dust removal of PVA， but increase the potential risk of dust emission on the ground surface in the PVA. More attention should be paid to ecological protection and restoration in PVA to improve the coverage of vegetation， reduce dust emission and improve the efficiency of power generation.

Key words: photovoltaic array （PVA）, wind conditions, wind direction guiding, wind velocity weakening, asymmetry, Gonghe Basin