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Feasibility studies on using jacket structure as natural grounding electrode of offshore wind turbines

Fang, Chaoying and Lei, Lan and Wang, Yu and Wen, Xishan and Siew, Wah Hoon and Farhan Bin Hanaffi, F and Timoshkin, Igor and Li, Jutian and Zhang, Zeng (2014) Feasibility studies on using jacket structure as natural grounding electrode of offshore wind turbines. In: 2014 IEEE International Conference on Lightning Protection (ICLP). IEEE, Piscataway, New Jersey. (In Press)

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Offshore wind power is becoming an important topic of the world's renewable energy research. Regarding the grounding of offshore wind turbines, a simulation model of the jacket structure as the grounding device is established in this paper. Every conductor of this model is divided into several segments, and the Green's function of each segment is solved with complex image method. Finally, the grounding resistance can be obtained on the basis of the principle of superposition. Moreover, this paper also analyzes several factors that affect the performance of this grounding electrode, including the depth of sea water, the resistivity of sea water and the soil resistivity of seabed. The results show that using the jacket structure as a natural grounding electrode is satisfactory for the safe grounding of offshore wind turbines.