Proceedings of International Conference on Applied Innovation in IT
2025/12/22, Volume 13, Issue 5, pp.1265-1269

Reduction of PID in Utility-Scale Photovoltaic Installations Through Enhanced Grounding Using Hydrogel-Graphite Filler


Muzaffar Murodov, Siarhei Baraishuk, Murodjon Nabiev and Elmurod Berkinov


Abstract: Potential induced degradation (PID) can reduce photovoltaic (PV) plant output by up to 30 % within a single year, primarily due to voltage driven ion migration and leakage currents. This study proposes a cost effective mitigation strategy that couples deep, vertical composite electrodes with a hydrogel-graphite backfill (GGG mix) [2]. The backfill reduces soil resistivity, stabilizes seasonal fluctuations, and limits the module-ground potential difference. The experimental photovoltaic station with a capacity of 30 kW (located on the territory of the Namangan State Technical University of the Republic of Uzbekistan, which is dry and has a soil consisting of a mixture of sand, stone and soil, the characteristics are the same as in the semi-desert) was equipped with three grounding configurations. Over 52 weeks, the GGG mix system lowered ground resistance by 45 % and cut the annual PID power loss index from 6.5 % to 1.8 %. Modelling confirmed an equivalent electrode diameter almost eighty times larger than a conventional 12 mm rod. Economic analysis indicated a 20 % reduction in installation cost relative to pre drilled electrodes. The proposed method therefore offers a practical pathway to PID resilient PV deployment in high resistivity soils.

Keywords: PID, Grounding, Hydrogel, Graphite, Photovoltaic, Soil Resistivity, Deep Electrode.

DOI: Under indexing

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References:

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