A Comparison of Frequency-Dependent Soil Models: Application to the Analysis of Grounding Systems

Cavka, Damir; Mora, Nicolás; Rachidi, Farhad

doi:10.1109/temc.2013.2271913

Cited by 159 publications

(75 citation statements)

References 20 publications

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“…Note that we have considered a simple, homogeneous model for the ground with constant, frequencyindependent electrical parameters. A more thorough analysis taking into account the soil inhomogeneity (e.g., [7] and [13]) and frequency dependence (e.g., [17], [34], and [53]) is beyond the scope of this paper.…”

Section: Discussionmentioning

confidence: 99%

On Lightning Electromagnetic Field Propagation Along an Irregular Terrain

Azadifar

Rachidi

et al. 2016

IEEE Trans. Electromagn. Compat.

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Abstract-In this paper, we present a theoretical analysis of the propagation effects of lightning electromagnetic fields over a mountainous terrain. The analysis is supported by experimental observations consisting of simultaneous records of lightning currents and electric fields associated with upward negative lightning flashes to the instrumented Säntis tower in Switzerland. The propagation of lightning electromagnetic fields along the mountainous region around the Säntis tower is simulated using a full-wave approach based on the finite-difference time-domain method and using the two-dimensional topographic map along the direct path between the tower and the field measurement station located at about 15 km from the tower. We show that, considering the real irregular terrain between the Säntis tower and the field measurement station, both the waveshape and amplitude of the simulated electric fields associated with return strokes and fast initial continuous current pulses are in excellent agreement with the measured waveforms. On the other hand, the assumption of a flat ground results in a significant underestimation of the peak electric field. Finally, we discuss the sensitivity of the obtained results to the assumed values for the return stroke speed and the ground conductivity, the adopted return stroke model, as well as the presence of the building on which the sensors were located.

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Section: Discussionmentioning

confidence: 99%

On Lightning Electromagnetic Field Propagation Along an Irregular Terrain

Azadifar

Rachidi

et al. 2016

IEEE Trans. Electromagn. Compat.

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“…Also, in this paper we do not consider the effect of attachment process between the downward leader and upward leader (e.g., Gao et al, 2014;Lu et al, 2008aLu et al, , 2008bLu et al, , 2009Lu et al, , 2012Lu et al, , 2013Jiang et al, 2013) on the far magnetic field, and also we do not consider the effect of frequency dependent soil (e.g., Cavka et al, 2014;Portela, 1999;Visacro et al, 2011;Visacro and Alipio, 2012), which will be studied in future work. …”

Section: Conclusion and Discussionmentioning

confidence: 99%

Validation and revision of far-field-current relationship for the lightning strike to electrically short objects

Zhang

Hou

et al. 2014

Journal of Atmospheric and Solar-Terrestrial Physics

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“…To ensure that the network operational parameters (i.e., power losses, voltage profile and short-circuit level) attain the highest possible improvements, the following terms are included in the proposed OF [3]. In the event of a short circuit fault, the current waveform of a synchronous DG can be divided into two components, namely the AC component, i AC (t), and DC component, i DC (t), as expressed below [10].…”

Section: Proposed Methodsmentioning

confidence: 99%

“…For example, attempts were made to locate and size DG sources in a distribution network to improve voltage profile, loss reduction, and short-circuit level reduction [3][4][5][6]. In order to tackle the protection challenges, a number of methods have been devised, including use of Fault Current Limiters (FCLs) [7], use of adaptive protection schemes according to fault location by a Supervisory Unit Controller Unit (SRCU) [8], and use of multiagent method [9].…”

Section: Introductionmentioning

confidence: 99%

Optimal placement and sizing of distributed generation sources considering network parameters and protection issues

Hosseini

Sadeghi

Abyaneh

et al. 2014

2014 International Conference on Renewable Energy Research and Application (ICRERA)

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We propose a method for optimal placement and sizing of distributed generation (DG) sources in an existing distribution network. The method, which uses the genetic algorithm, provides improved network parameters (i.e., voltage profile, power losses, and short circuit levels) while keeping the existing coordination of protection devices unchanged. An important feature of the proposed method is the accommodations for transient shortcircuit fault currents due to DGs and their connection/disconnection states, thus preventing undesired effects on the coordination of protection devices. To demonstrate the feasibility of the proposed method, we present simulated results for optimal placement of DGs in an existing distribution network.

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A Comparison of Frequency-Dependent Soil Models: Application to the Analysis of Grounding Systems

Cited by 159 publications

References 20 publications

On Lightning Electromagnetic Field Propagation Along an Irregular Terrain

On Lightning Electromagnetic Field Propagation Along an Irregular Terrain

Validation and revision of far-field-current relationship for the lightning strike to electrically short objects

Optimal placement and sizing of distributed generation sources considering network parameters and protection issues

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