Review of Ground Insulation Resistance Detection Methods for Photovoltaic (PV) Systems

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Review of Ground Insulation Resistance Detection Methods for Photovoltaic (PV) Systems

Wenping Zhang 1,* Linyan Xu 1 Yiming Wang 1 Po Xu 1 Yiming Wang 1 Ke Ma 2
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1
Research Center, Ginlong Technologies Co., Ltd., Xiangshan, Ningbo 315712, China
2
Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
*
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Received: 04 September 2025 Revised: 02 December 2025 Accepted: 08 December 2025 Published: 12 December 2025

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© 2025 The authors. This is an open access article under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/).

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Smart Energy Syst. Res. 2025, 1(2), 10007; DOI: 10.70322/sesr.2025.10007
ABSTRACT: With the rapid growth of PV systems, accurate detection of insulation resistance in PV inverters has become increasingly crucial to ensure system safety and operational stability. This paper presents a systematic review of current ground insulation resistance detection methods for PV systems. First, the operating principles of various insulation resistance detection schemes are reviewed. Furthermore, the performance of these methods is evaluated based on several key metrics. Additionally, various fault locating techniques are examined. Overall, this paper aims to provide a comprehensive overview of the latest advancements in insulation resistance detection for PV systems.
Keywords: PV system; Insulation resistance; Fault detection; Fault locating
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