RESEARCH ON ISLANDING DETECTION OF GRID-CONNECTED SOLAR PHOTOVOLTAIC POWER GENERATION SYSTEM BASED ON IMPROVED ACTIVE FREQUENCY OFFSET

Yao Yuan; Liang Defei; Fu Hao; Guo Qianqian; Gao Kang

doi:10.19912/j.0254-0096.tynxb.2024-0971

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (12) : 101-109. DOI: 10.19912/j.0254-0096.tynxb.2024-0971

RESEARCH ON ISLANDING DETECTION OF GRID-CONNECTED SOLAR PHOTOVOLTAIC POWER GENERATION SYSTEM BASED ON IMPROVED ACTIVE FREQUENCY OFFSET

Yao Yuan^1,2, Liang Defei³, Fu Hao¹, Guo Qianqian³, Gao Kang¹

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Abstract

Propose an islanding detection method for grid-connected solar photovoltaic power generation systems. In depth exploration of the mechanism of islanding, islanding detection of solar photovoltaic power generation grid connected systems is divided into two situations： off grid and non-off-gridstate. In response to the off grid state, Hall sensors are introduced to collect voltage signals from photovoltaic grid connection points, and isolation technology and filters are used to overcome interference effects, accurately reflecting the system's operating status and achieving islanding detection under off-grid conditions; Based on the active frequency offset method, an improvement is made for the non-off-gridstate by introducing positive feedback disturbance to enhance frequency deviation. To improve its applicability, the initial chopping frequency is adjusted according to the load characteristics, and the distribution of blind zone boundaries is changed to achieve islanding detection in the non-off-gridstate. Thus, effective detection of islanding in grid-connected solar photovoltaic power generation systems can be achieved. The experimental results show that in the off-grid state, the voltage signal obtained by the proposed method at the photovoltaic grid connection point is consistent with the actual voltage signal. In the non-off-gridstate, the voltage frequency offset can be effectively detected, and the islanding detection time is all within the maximum duration of the islanding. The detection speed is fast, the false detection rate is below 0.05%, the missed detection rate is 0, and the detection blind zone is small, which can achieve effective islanding detection.

Key words

grid connected solar photovoltaic power generation system / detecting blind spots / Hall sensor / isolation technology / positive feedback disturbance / island detection

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Yao Yuan, Liang Defei, Fu Hao, Guo Qianqian, Gao Kang. RESEARCH ON ISLANDING DETECTION OF GRID-CONNECTED SOLAR PHOTOVOLTAIC POWER GENERATION SYSTEM BASED ON IMPROVED ACTIVE FREQUENCY OFFSET[J]. Acta Energiae Solaris Sinica. 2026, 47(12): 101-109 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0971

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