PHOTOVOLTAIC POWER STATION FASTENING STATE MONITORING SYSTEM BASED ON CHAINED RESISTIVE SENSOR NETWORK

Zhang Xiao; Song Shuaidi; Huang Yuhang; Wang Xia; Wang Qiang

doi:10.19912/j.0254-0096.tynxb.2025-0695

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (9) : 242-251. DOI: 10.19912/j.0254-0096.tynxb.2025-0695

PHOTOVOLTAIC POWER STATION FASTENING STATE MONITORING SYSTEM BASED ON CHAINED RESISTIVE SENSOR NETWORK

Zhang Xiao^1,2, Song Shuaidi³, Huang Yuhang⁴, Wang Xia⁴, Wang Qiang¹

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Abstract

To address the issue of bolt loosening detection and localization in the structural safety of photovoltaic （PV） power stations, this paper proposes a PV fastening state monitoring system based on a chained resistive sensor network. Firstly, based on the principle that bolt loosening is caused by the relative rotation between the bolt and nut, surface sensors and bracket sensors are designed for different bolt structures in PV modules, converting bolt rotation into resistance signals. Secondly, considering the distribution characteristics of surface bolts and bracket bolts, forward and reverse detection circuits for the surface and detection circuits for the bracket are respectively designed. By monitoring the changes in the total resistance of the detection circuit, the system can determine the position and quantity of loosened bolts. Based on the I-V characteristics of diodes, a voltage-current difference ratio method is proposed to reduce the impact of diode internal resistance on the total resistance, thereby improving the accuracy of surface detecting the number of loosened surface bolts. Experimental results show that the system can accurately detect the location and number of loosened bolts in PV power stations. The detection capacity increases with higher detection voltage and sensor resistance. This system enables remote monitoring and early warning of bolt loosening, providing an efficient and reliable solution for bolt status monitoring in distributed PV power stations.

Key words

PV modules / bolts / diodes / sensor / detection circuit / voltage-current difference ratio method

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Zhang Xiao, Song Shuaidi, Huang Yuhang, Wang Xia, Wang Qiang. PHOTOVOLTAIC POWER STATION FASTENING STATE MONITORING SYSTEM BASED ON CHAINED RESISTIVE SENSOR NETWORK[J]. Acta Energiae Solaris Sinica. 2026, 47(9): 242-251 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0695

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