Lightning protection techniques for roof-top PV systems

Fallah, Narjes; Gomes, Chandima; Kadir, Mohd Zainal Abidin Ab; Nourirad, Ghasem; Baojahmadi, Mina; Ahmed, Rebaz J.

doi:10.1109/peoco.2013.6564584

Cited by 20 publications

(7 citation statements)

References 5 publications

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“…where σ is the conductivity; E is the electric field strength; and Φ is the electrical potential. The governing equation in the finite element is obtained as Equations (10),…”

Section: Thermoelectric Coupling Theorymentioning

confidence: 99%

“…To ensure PV systems safe and reliable, lightning protection design attracts more and more attention. At present, there is much research on direct lightning and lightninginduced overvoltage in PV power plants [10][11][12][13]. Y. G. Jia [14] and F. Y. Guo [15] pointed out the design of the green building and the key point of lightning protection.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and Experimental Study of Lightning Stroke to BIPV Modules

et al. 2021

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Building Integrated Photovoltaic (BIPV) modules are a new type of photovoltaic (PV) modules that are widely used in distributed PV stations on the roof of buildings for power generation. Due to the high installation location, BIPV modules suffer from lightning hazard greatly. In order to evaluate the risk of lightning stroke and consequent damage to BIPV modules, the studies on the lightning attachment characteristics and the lightning energy withstand capability are conducted, respectively, based on numerical and experimental methods in this paper. In the study of lightning attachment characteristics, the numerical simulation results show that it is easier for the charges to concentrate on the upper edge of the BIPV metal frame. Therefore, the electric field strength at the upper edge is enhanced to emit upward leaders and attract the lightning downward leaders. The conclusion is verified through the long-gap discharge experiment in a high voltage lab. From the experimental study of multi-discharge in the lab, it is found that the lightning interception efficiency of the BIPV module is improved by 114% compared with the traditional PV modules. In the study of lightning energy withstand capability, a thermoelectric coupling model is established. With this model, the potential, current and temperature can be calculated in the multi-physical field numerical simulation. The results show that the maximum temperature of the metal frame increases by 16.07 °C when 100 kA lightning current flows through it and does not bring any damage to the PV modules. The numerical results have a good consistency with the experimental study results obtained from the 100 kA impulse current experiment in the lab.

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“…where σ is the conductivity; E is the electric field strength; and Φ is the electrical potential. The governing equation in the finite element is obtained as Equations (10),…”

Section: Thermoelectric Coupling Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Study of Lightning Stroke to BIPV Modules

et al. 2021

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“…Most of the studies about LS effects in the literature encompassed direct LS on small-size PV arrays [3,6,[14][15][16][17][18][19][20][21]; some of them were devoted to medium or large-size PV arrays [22][23][24], but only few analysed lightning-induced overvoltage transients at the AC or DC side of grid-connected PV systems [4,[25][26][27][28][29][30][31][32][33][34][35]. Using different electromagnetic (EM) analysis for the DC side [36], these works assessed the lightning-induced voltages in the loops formed by the internal circuit of the PV module or the wiring of the PV array.…”

Section: Introductionmentioning

confidence: 99%

A study on the effects of electromagnetic coupling mechanisms in the event of an indirect lightning strike near photovoltaic arrays

Hernández

Sutil

Petrarca

et al. 2023

IET Renewable Power Gen

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Indirect lightning strikes hitting near photovoltaic installations are much more frequent than direct hits, and can generate overvoltage in their electric circuitry. The authors developed a method to estimate the induced overvoltage on single photovoltaic modules. Using a model of the whole array also including Inter‐Module Coupling Mechanisms (IMCMs), a new approach to estimate overvoltage induced on full arrays is presented in this paper. The procedure first estimates lumped parameters, modelling either the coupling between the lightning channel and each module in the array or between each couple of modules in array. Several circuital simulations are then run using suitable equivalent circuits. The aim is to consider different array configurations and groundings schemes. This allows extracting the most relevant configuration parameters influencing overvoltage/overcurrent. Results show that the groundings scheme impacts negligibly, but the single module electric stress is decreased by 35% in the case of ungrounded configurations. Among the considered array configurations, the honey‐comb and total cross‐tied showed the smallest impact on overvoltage. Statistical analysis on random LC tortuous geometry leads to a non‐negligible rise of overvoltage peak values, up to 24%. Finally, the relevance of different IMCMs is analysed, showing a strong impact just on frame‐ground voltages and currents.

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“…Despite the installation of the lightning protection system (LPS), direct lightning strikes to the solar PV panel frame/structure might still happen. The general strategies in installing the PV system components and location design for optimized efficiency of power production should be compatible with strategies of lightning protection design [2].…”

Section: Introductionmentioning

confidence: 99%

Effect of group grounding on the potential rise across solar PV panels during lightning strike

Mohamed¹,

Siew²,

Mahmud³

2019

2019 11th Asia-Pacific International Conference on Lightning (APL)

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Grounding systems play a vital role for dissipating the energy originating from a lightning stroke to the earth, functioning as an important component for protection and safety. In a solar photovoltaic (PV) farm, solar PV panels are fixed on a grounded structure with bolts and nuts. The structure, the frame of the PV panels, and the bolts and nuts are metallic (together called the assembly) and the layout of all assemblies of the entire solar farm depends on the terrain where they are installed. Lightning protection systems which are installed on a solar PV farm are mostly based on a Franklin rod (connected to a down-conductor) as the preferred point of attachment. These lightning rods can be installed either as isolated systems or as non-isolated systems from the solar panel assemblies. This paper is focused on the effect of group grounding on the potential rise across the solar PV panels during lightning strike. This whole assembly is simulated for various lightning attachment points in PSPICE using the lossy transmission line model. Voltage drop at various points in the assembly is measured for various soil resistivity. Based on the simulation results, group grounding of solar PV panels with middle grounding shows relatively low voltage drops compared to end grounding.

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Lightning protection techniques for roof-top PV systems

Cited by 20 publications

References 5 publications

Numerical and Experimental Study of Lightning Stroke to BIPV Modules

Numerical and Experimental Study of Lightning Stroke to BIPV Modules

A study on the effects of electromagnetic coupling mechanisms in the event of an indirect lightning strike near photovoltaic arrays

Effect of group grounding on the potential rise across solar PV panels during lightning strike

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