| 摘要: |
| 输电线路覆冰严重影响电网安全运行。现有输电线路积冰模型多忽略轴向积冰差异,且将关键积冰参数设定为时不变（单步）条件,鲜见时变参数（多步）三维积冰模型的讨论。本文基于润滑理论及导线覆冰机理,提出了考虑时变积冰参数影响下的输电导线覆冰模型。依托ANSYS-Fluent ICING模块,对三维导线模型开展时变参数积冰计算,利用真实输电线路覆冰试验数据对计算方法的有效性进行了验证,计算结果与试验结果吻合度较好。在此基础上对比研究了单步与多步积冰算法,并着重分析了输电导线倾斜角度、导线直径对积冰形貌、积冰质量的影响。结果表明:多步积冰计算法较单步积冰计算法精度提高约8%。干覆冰条件下,随输电线倾斜角度增大,输电线上积冰形貌和积冰质量均没有明显变化；湿覆冰条件下,输电线倾斜角度对积冰有显著影响,当倾斜角度由0°增至60°,表面积冰覆盖面积减小、积冰形貌逐渐圆滑,但积冰质量降低约21%。对比不同直径导线积冰计算结果,大直径导线积冰量明显高于小直径导线。 |
| 关键词: 架空输电线 三维积冰模型 时变参数 雾凇覆冰 雨凇覆冰 冰形 覆冰量 |
| DOI：10.11918/202202066 |
| 分类号:TM751 |
| 文献标识码:A |
| 基金项目:国家重点研发计划(2018YFC0809400)； 国家自然科学基金(52075169)； 北京市自然科学基金(8202043) |
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| Three-dimensional time-varying ice accretion calculation for overhead transmission lines |
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ZHOU Chao1,2,CHAO Meng1
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(1.Key Laboratory of Power Station Energy Transfer Conversion and System (North China Electric Power University), Ministry of Education, Beijing 102206, China;2. Hebei Key Laboratory of Electric Machinery Health Maintenance & Failure Prevention (North China Electric Power University), Baoding 071003, Hebei, China)
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| Abstract: |
| The icing of transmission lines has seriously affected the safe operation of the power grid. Existing transmission line icing models mostly ignore the axial icing difference and consider the key icing parameters as time-invariant (single-step) conditions, while there are few reports on three-dimensional ice accretion model with time-varying (multi-step) parameters. Based on lubrication theory and line icing mechanism, this paper proposes a transmission line icing model considering the influence of time-varying icing parameters. By adopting the ANSYS-Fluent ICING module, the icing calculation for time-varying parameters was carried out on the three-dimensional line model. The validity of the calculation method was verified by using actual transmission line icing test data, and the calculation results were in good agreement with the test results. On this basis, the single-step and multi-step ice accretion calculation methods were compared. The influence of the transmission line inclination angle and line diameter on the shape and mass of ice accretion was analyzed. Results show that the accuracy of multi-step icing calculation method was about 8% higher than the single-step icing calculation method. Under the condition of dry ice coating, with the increase in the inclination angle of the transmission line, the shape and mass of ice accretion on the transmission line had no obvious change. Under wet icing conditions, the inclination angle of the transmission line had a significant effect on the ice accretion. As the inclination angle increased from 0° to 60°, the ice coverage area decreased and the shape of ice accretion gradually became smoother, but the ice accretion mass decreased by about 21%. The calculation results of ice accretion on transmission lines with large and small diameters were compared, and the amount of ice accretion on lines with large diameters was significantly higher than that on lines with small diameters. |
| Key words: overhead transmission lines three-dimensional ice accretion model time-varying parameters rime icing glaze icing ice shape amount of icing |
