International journal of electronic and electrical engineering systems
Volume 1, Numéro 1, Pages 21-27
2018-03-31

Impulse Analysis Of Isolated And Interconnected Wtgss Under Lightning Discharges



Authors : Kherif O. . Chiheb S. . Teguar M. . Mekhaldi A. .

Abstract

Most of the malfunctions of electrical systems inside wind turbine, including the control ones, are related to the ground potential rise of the grounding system resulting from lightning discharge. Indeed, the performance of such systems mainly depends on the lightning current wave propagation characteristics. Large grounding system performance against lightning discharge depends on the current wave propagation characteristics through the grounding system. It is in this light that the paper proposes to analyse and discuss the impulse behaviour of Wind Turbine Grounding System (WTGS). The interconnection effect on the lightning response of WTGS has been investigated for various values of soil resistivities. Also, the paper discusses the feed point effect for typical small wind farm. It is found that the soil resistivity has a significant influence affecting the transient response of WTGS while the interconnection facilitates the flow of the current into the ground. For interconnected systems, it is shown that the injection at the middle wind turbines gives the lower ground potential rise, thus, more suitable results than the other ones. It is suggested that the wind turbines of the middle should be more taller than the other, especially for those installed in areas characterizing by high values of soil resistivity.

Keywords

Wind turbine, Grounding, Lightning protection, Transient response, Transmission line approach

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