發(fā)布時(shí)間：2018-11-07 17:45

【摘要】：風(fēng)力發(fā)電機(jī)組與其它地面雷擊目標(biāo)物相比,最顯著的特征是其葉片在遭受雷擊時(shí)一般處于轉(zhuǎn)動(dòng)狀態(tài)。為了研究葉片轉(zhuǎn)動(dòng)對(duì)風(fēng)機(jī)引雷能力的影響機(jī)理,該文設(shè)計(jì)選取了適用于研究風(fēng)機(jī)接閃試驗(yàn)的圓弧形高壓電極,施加負(fù)極性250/2500μs標(biāo)準(zhǔn)操作波,對(duì)典型2MW風(fēng)機(jī)的1:30微縮模型進(jìn)行了葉片靜止和旋轉(zhuǎn)等不同狀態(tài)下的接閃放電比對(duì)試驗(yàn)。采用升降法獲取50%放電電壓,并進(jìn)行放電過(guò)程觀測(cè),結(jié)果表明:在1和1.3m間隙條件下,擊穿電壓隨著葉片轉(zhuǎn)速的提升而提升,先導(dǎo)連接位置隨著轉(zhuǎn)速的提升更加接近葉尖,葉片轉(zhuǎn)動(dòng)導(dǎo)致風(fēng)機(jī)的引雷能力降低。分析認(rèn)為葉片的旋轉(zhuǎn)改變了葉尖區(qū)域的電荷分布,使葉尖上行先導(dǎo)發(fā)展不充分,從而影響了放電發(fā)展過(guò)程。所得結(jié)果可為風(fēng)電機(jī)組的防雷保護(hù)提供參考借鑒。
[Abstract]:The most remarkable feature of wind turbine is that its blade is generally rotated when it is struck by lightning. In order to study the influence mechanism of blade rotation on the lightning induced ability of fan, a circular arc high pressure electrode suitable for the study of fan flashover test was designed and applied negative polarity 250 / 2500 渭 s standard operating wave. The 1:30 miniature model of typical 2MW fan was tested under different conditions such as blade static and rotating. The 50% discharge voltage was obtained by lifting method, and the discharge process was observed. The results show that the breakdown voltage increases with the increase of blade speed under the condition of 1 and 1.3 m gap. The leading connection position is closer to the tip of the blade with the increase of the speed, and the blade rotation results in the decrease of the lightning triggering capacity of the fan. It is considered that the rotation of the blade changes the charge distribution in the tip of the blade, which makes the upwardly leading development of the tip insufficient, thus affecting the development of the discharge process. The results can be used for reference for lightning protection of wind turbine.
【作者單位】： 武漢大學(xué)電氣工程學(xué)院;
【分類號(hào)】：TM865
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本文編號(hào)：2317100