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Mathematical Problems in EngineeringVolume 2013 2013, Article ID 757656, 8 pages

Research ArticleSchool of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China

Received 12 December 2012; Revised 16 March 2013; Accepted 16 March 2013

Academic Editor: Massimo Scalia

Copyright © 2013 Xiaoqing Zhang and Yongzheng Zhang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

An efficient method is proposed in this paper for calculating lightning transient responses on wind turbine towers. In the proposed method, the actual tower body is simplified as a multiconductor grid in the shape of cylinder. A set of formulas are given for evaluating the circuit parameters of the branches in the multiconductor grid. On the basis of the circuit parameters, the multiconductor grid is further converted into an equivalent circuit. The circuit equation is built in frequency-domain to take into account the effect of the frequency-dependent characteristic of the resistances and inductances on lightning transients. The lightning transient responses can be obtained by using the discrete Fourier transform with exponential sampling to take the inverse transform of the frequency-domain solution of the circuit equation. A numerical example has been given for examining the applicability of the proposed method.





Autor: Xiaoqing Zhang and Yongzheng Zhang

Fuente: https://www.hindawi.com/



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