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Appl. Sci. 2017, 7(12), 1323; https://doi.org/10.3390/app7121323

Evaluating the High Frequency Behavior of the Modified Grounding Scheme in Wind Farms

1
Department of Electrical Engineering, Islamic Azad University, Tehran Science and Research Branch, Tehran 1477893855, Iran
2
Department of Mathematics, University of Padua, 35131 Padua, Italy
*
Author to whom correspondence should be addressed.
Received: 11 November 2017 / Revised: 6 December 2017 / Accepted: 13 December 2017 / Published: 19 December 2017
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Abstract

Wind generators are exposed to numerous destructive forces such as lightning and are therefore vulnerable to these phenomena. To evaluate the transient behavior of a wind power plant during direct and indirect strikes, modeling of all relevant components is required. Among the protective and control components of wind turbines, the grounding system is the most important element for protection against lightning strikes. This paper examines the impact of nonlinear soil ionization behavior and frequency dependency on a wind turbine in order to model a sufficient protection scheme to reduce overvoltage and make the system tolerable against transitions. The high frequency models of other equipment such as transformers, horizontal conductors, vertical rods, surge arresters and underground cables must also be taken into account to design the grounding system. Our Proposed Modified Grounding Scheme (PMGS) is to reduce the maximum transient overvoltages. We simulate the model in a restructured version of the Electromagnetic Transient Program (EMTP-RV) software to examine the effectiveness of the system. We then apply the simulated results to pair of turbines that are interconnected with a frequency-dependent cable. We carry out the simulation for direct and indirect lightning strikes. The results indicate that the MGS can lead to considerably more than a 50% reduction in transient voltages for lightning and thus leads to more reliable networks. View Full-Text
Keywords: wind turbine; lightning; high frequency model; overvoltages; soil ionization; grounding scheme wind turbine; lightning; high frequency model; overvoltages; soil ionization; grounding scheme
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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. (CC BY 4.0).
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Hajeforosh, S.F.; Pooranian, Z.; Shabani, A.; Conti, M. Evaluating the High Frequency Behavior of the Modified Grounding Scheme in Wind Farms. Appl. Sci. 2017, 7, 1323.

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