MONITORING TECHNOLOGY AND FAULT ANALYSIS OF PHOTOVOLTAIC GRID-CONNECTED POWER STATION

Jin Lijun; Pan Yan; Huang Jiaqi

doi:10.19912/j.0254-0096.tynxb.2023-1841

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (3) : 365-372. DOI: 10.19912/j.0254-0096.tynxb.2023-1841

MONITORING TECHNOLOGY AND FAULT ANALYSIS OF PHOTOVOLTAIC GRID-CONNECTED POWER STATION

Jin Lijun, Pan Yan, Huang Jiaqi

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Abstract

A simplified impedance model of T-type grid-connected line is developed based on analyzing of various factors influencing voltage distortion at the grid connection point. Furthermore, the cause of voltage transformer insulation damage in PV grid-connected power stations is explored through simulation analysis. The TEV method is used to measure the partial discharge of switchgear , the ultrasonic method is used to determine the location of the discharge point. when combined with a power quality online monitoring device, it enables accurate identification of the underlying causes behind such partial discharges. The experimental data demonstrate that the voltage transformer has been exposed to five harmonics exceeding the limit for an extended period, resulting in insulation degradation and air gap discharge, ultimately leading to explosion. After rectifying the defects in SVG and addressing the issues with the secondary circuit of the voltage transformer, system operation restored to stability, which verifies the accuracy of the experimental analysis。

Key words

photovoltaic power systems / partial discharge / failure analysis / condition monitoring / circuit resonance / harmonics

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Jin Lijun, Pan Yan, Huang Jiaqi. MONITORING TECHNOLOGY AND FAULT ANALYSIS OF PHOTOVOLTAIC GRID-CONNECTED POWER STATION[J]. Acta Energiae Solaris Sinica. 2025, 46(3): 365-372 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1841

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