Improved calculation method of annual lightning flash number for wind turbine
With the increasement of wind power generation,reliability of wind turbine becomes more and more important.Lightning protection of wind turbine has become a hotspot recently. Accurate annual lightning flash number determination is on the premise of proper lightning pro-tection measurements.The formula for the number of lightning flashes according to IEC was in-troduced and its problems were also analyzed.Combined with the rotation of wind turbine blades, the annual number of lightning flashes under different equivalent attractive radius formulas was calculated by the means of Monte Carlo simulation.Model proposed by Rizk for assessment of lightning stroke incidence in high building was applied to calculate the number of upward flashes for wind turbines.The simulation results show that the annual number of downward flashes and upward flashes both increase with the height of the tower,while the percentage of the downward flashes decreases.The calculation method proposed in this paper is in good agreement with actual <br> situation compared with the IEC formula,which could provide reliable evidence for lightning pro-tection in wind farms.
wind turbineannual number of lightning flashesequivalent attractive radiusup-ward flashes
NETL
NSTL
万方数据
维普
